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cpp-peglib/peglib.h
yhirose 73a058d4d9 Fixed char -> int conversion problem
2021-02-08 16:23:45 -05:00

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//
// peglib.h
//
// Copyright (c) 2020 Yuji Hirose. All rights reserved.
// MIT License
//
#pragma once
#include <algorithm>
#include <any>
#include <cassert>
#include <cctype>
#if __has_include(<charconv>)
#include <charconv>
#endif
#include <cstring>
#include <functional>
#include <initializer_list>
#include <iostream>
#include <limits>
#include <list>
#include <map>
#include <memory>
#include <mutex>
#include <set>
#include <sstream>
#include <string>
#include <unordered_map>
#include <vector>
#if !defined(__cplusplus) || __cplusplus < 201703L
#error "Requires complete C++17 support"
#endif
namespace peg {
/*-----------------------------------------------------------------------------
* scope_exit
*---------------------------------------------------------------------------*/
// This is based on
// "http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4189".
template <typename EF> struct scope_exit {
explicit scope_exit(EF &&f)
: exit_function(std::move(f)), execute_on_destruction{true} {}
scope_exit(scope_exit &&rhs)
: exit_function(std::move(rhs.exit_function)),
execute_on_destruction{rhs.execute_on_destruction} {
rhs.release();
}
~scope_exit() {
if (execute_on_destruction) { this->exit_function(); }
}
void release() { this->execute_on_destruction = false; }
private:
scope_exit(const scope_exit &) = delete;
void operator=(const scope_exit &) = delete;
scope_exit &operator=(scope_exit &&) = delete;
EF exit_function;
bool execute_on_destruction;
};
/*-----------------------------------------------------------------------------
* UTF8 functions
*---------------------------------------------------------------------------*/
inline size_t codepoint_length(const char *s8, size_t l) {
if (l) {
auto b = static_cast<uint8_t>(s8[0]);
if ((b & 0x80) == 0) {
return 1;
} else if ((b & 0xE0) == 0xC0 && l >= 2) {
return 2;
} else if ((b & 0xF0) == 0xE0 && l >= 3) {
return 3;
} else if ((b & 0xF8) == 0xF0 && l >= 4) {
return 4;
}
}
return 0;
}
inline size_t codepoint_count(const char *s8, size_t l) {
size_t count = 0;
for (size_t i = 0; i < l; i += codepoint_length(s8 + i, l - i)) {
count++;
}
return count;
}
inline size_t encode_codepoint(char32_t cp, char *buff) {
if (cp < 0x0080) {
buff[0] = static_cast<char>(cp & 0x7F);
return 1;
} else if (cp < 0x0800) {
buff[0] = static_cast<char>(0xC0 | ((cp >> 6) & 0x1F));
buff[1] = static_cast<char>(0x80 | (cp & 0x3F));
return 2;
} else if (cp < 0xD800) {
buff[0] = static_cast<char>(0xE0 | ((cp >> 12) & 0xF));
buff[1] = static_cast<char>(0x80 | ((cp >> 6) & 0x3F));
buff[2] = static_cast<char>(0x80 | (cp & 0x3F));
return 3;
} else if (cp < 0xE000) {
// D800 - DFFF is invalid...
return 0;
} else if (cp < 0x10000) {
buff[0] = static_cast<char>(0xE0 | ((cp >> 12) & 0xF));
buff[1] = static_cast<char>(0x80 | ((cp >> 6) & 0x3F));
buff[2] = static_cast<char>(0x80 | (cp & 0x3F));
return 3;
} else if (cp < 0x110000) {
buff[0] = static_cast<char>(0xF0 | ((cp >> 18) & 0x7));
buff[1] = static_cast<char>(0x80 | ((cp >> 12) & 0x3F));
buff[2] = static_cast<char>(0x80 | ((cp >> 6) & 0x3F));
buff[3] = static_cast<char>(0x80 | (cp & 0x3F));
return 4;
}
return 0;
}
inline std::string encode_codepoint(char32_t cp) {
char buff[4];
auto l = encode_codepoint(cp, buff);
return std::string(buff, l);
}
inline bool decode_codepoint(const char *s8, size_t l, size_t &bytes,
char32_t &cp) {
if (l) {
auto b = static_cast<uint8_t>(s8[0]);
if ((b & 0x80) == 0) {
bytes = 1;
cp = b;
return true;
} else if ((b & 0xE0) == 0xC0) {
if (l >= 2) {
bytes = 2;
cp = ((static_cast<char32_t>(s8[0] & 0x1F)) << 6) |
(static_cast<char32_t>(s8[1] & 0x3F));
return true;
}
} else if ((b & 0xF0) == 0xE0) {
if (l >= 3) {
bytes = 3;
cp = ((static_cast<char32_t>(s8[0] & 0x0F)) << 12) |
((static_cast<char32_t>(s8[1] & 0x3F)) << 6) |
(static_cast<char32_t>(s8[2] & 0x3F));
return true;
}
} else if ((b & 0xF8) == 0xF0) {
if (l >= 4) {
bytes = 4;
cp = ((static_cast<char32_t>(s8[0] & 0x07)) << 18) |
((static_cast<char32_t>(s8[1] & 0x3F)) << 12) |
((static_cast<char32_t>(s8[2] & 0x3F)) << 6) |
(static_cast<char32_t>(s8[3] & 0x3F));
return true;
}
}
}
return false;
}
inline size_t decode_codepoint(const char *s8, size_t l, char32_t &cp) {
size_t bytes;
if (decode_codepoint(s8, l, bytes, cp)) { return bytes; }
return 0;
}
inline char32_t decode_codepoint(const char *s8, size_t l) {
char32_t cp = 0;
decode_codepoint(s8, l, cp);
return cp;
}
inline std::u32string decode(const char *s8, size_t l) {
std::u32string out;
size_t i = 0;
while (i < l) {
auto beg = i++;
while (i < l && (s8[i] & 0xc0) == 0x80) {
i++;
}
out += decode_codepoint(&s8[beg], (i - beg));
}
return out;
}
template <typename T> const char *u8(const T *s) {
return reinterpret_cast<const char *>(s);
}
/*-----------------------------------------------------------------------------
* escape_characters
*---------------------------------------------------------------------------*/
inline std::string escape_characters(const char *s, size_t n) {
std::string str;
for (size_t i = 0; i < n; i++) {
auto c = s[i];
switch (c) {
case '\n': str += "\\n"; break;
case '\r': str += "\\r"; break;
case '\t': str += "\\t"; break;
default: str += c; break;
}
}
return str;
}
inline std::string escape_characters(std::string_view sv) {
return escape_characters(sv.data(), sv.size());
}
/*-----------------------------------------------------------------------------
* resolve_escape_sequence
*---------------------------------------------------------------------------*/
inline bool is_hex(char c, int &v) {
if ('0' <= c && c <= '9') {
v = c - '0';
return true;
} else if ('a' <= c && c <= 'f') {
v = c - 'a' + 10;
return true;
} else if ('A' <= c && c <= 'F') {
v = c - 'A' + 10;
return true;
}
return false;
}
inline bool is_digit(char c, int &v) {
if ('0' <= c && c <= '9') {
v = c - '0';
return true;
}
return false;
}
inline std::pair<int, size_t> parse_hex_number(const char *s, size_t n,
size_t i) {
int ret = 0;
int val;
while (i < n && is_hex(s[i], val)) {
ret = static_cast<int>(ret * 16 + val);
i++;
}
return std::pair(ret, i);
}
inline std::pair<int, size_t> parse_octal_number(const char *s, size_t n,
size_t i) {
int ret = 0;
int val;
while (i < n && is_digit(s[i], val)) {
ret = static_cast<int>(ret * 8 + val);
i++;
}
return std::pair(ret, i);
}
inline std::string resolve_escape_sequence(const char *s, size_t n) {
std::string r;
r.reserve(n);
size_t i = 0;
while (i < n) {
auto ch = s[i];
if (ch == '\\') {
i++;
if (i == n) { throw std::runtime_error("Invalid escape sequence..."); }
switch (s[i]) {
case 'n':
r += '\n';
i++;
break;
case 'r':
r += '\r';
i++;
break;
case 't':
r += '\t';
i++;
break;
case '\'':
r += '\'';
i++;
break;
case '"':
r += '"';
i++;
break;
case '[':
r += '[';
i++;
break;
case ']':
r += ']';
i++;
break;
case '\\':
r += '\\';
i++;
break;
case 'x':
case 'u': {
char32_t cp;
std::tie(cp, i) = parse_hex_number(s, n, i + 1);
r += encode_codepoint(cp);
break;
}
default: {
char32_t cp;
std::tie(cp, i) = parse_octal_number(s, n, i);
r += encode_codepoint(cp);
break;
}
}
} else {
r += ch;
i++;
}
}
return r;
}
/*-----------------------------------------------------------------------------
* token_to_number_ - This function should be removed eventually
*---------------------------------------------------------------------------*/
template <typename T> T token_to_number_(std::string_view sv) {
T n = 0;
#if __has_include(<charconv>)
if constexpr (!std::is_floating_point<T>::value) {
std::from_chars(sv.data(), sv.data() + sv.size(), n);
return n;
}
#endif
auto s = std::string(sv);
std::istringstream ss(s);
ss >> n;
return n;
}
/*-----------------------------------------------------------------------------
* Trie
*---------------------------------------------------------------------------*/
class Trie {
public:
Trie() = default;
Trie(const Trie &) = default;
Trie(const std::vector<std::string> &items) {
for (const auto &item : items) {
for (size_t len = 1; len <= item.size(); len++) {
auto last = len == item.size();
std::string_view sv(item.data(), len);
auto it = dic_.find(sv);
if (it == dic_.end()) {
dic_.emplace(sv, Info{last, last});
} else if (last) {
it->second.match = true;
} else {
it->second.done = false;
}
}
}
}
size_t match(const char *text, size_t text_len) const {
size_t match_len = 0;
auto done = false;
size_t len = 1;
while (!done && len <= text_len) {
std::string_view sv(text, len);
auto it = dic_.find(sv);
if (it == dic_.end()) {
done = true;
} else {
if (it->second.match) { match_len = len; }
if (it->second.done) { done = true; }
}
len += 1;
}
return match_len;
}
private:
struct Info {
bool done;
bool match;
};
// TODO: Use unordered_map when heterogeneous lookup is supported in C++20
// std::unordered_map<std::string, Info> dic_;
std::map<std::string, Info, std::less<>> dic_;
};
/*-----------------------------------------------------------------------------
* PEG
*---------------------------------------------------------------------------*/
/*
* Line information utility function
*/
inline std::pair<size_t, size_t> line_info(const char *start, const char *cur) {
auto p = start;
auto col_ptr = p;
auto no = 1;
while (p < cur) {
if (*p == '\n') {
no++;
col_ptr = p + 1;
}
p++;
}
auto col = codepoint_count(col_ptr, p - col_ptr) + 1;
return std::pair(no, col);
}
/*
* String tag
*/
inline constexpr unsigned int str2tag_core(const char *s, size_t l,
unsigned int h) {
return (l == 0) ? h
: str2tag_core(s + 1, l - 1,
(h * 33) ^ static_cast<unsigned char>(*s));
}
inline constexpr unsigned int str2tag(std::string_view sv) {
return str2tag_core(sv.data(), sv.size(), 0);
}
namespace udl {
inline constexpr unsigned int operator"" _(const char *s, size_t l) {
return str2tag_core(s, l, 0);
}
} // namespace udl
/*
* Semantic values
*/
struct SemanticValues : protected std::vector<std::any> {
// Input text
const char *path = nullptr;
const char *ss = nullptr;
const std::vector<size_t> *source_line_index = nullptr;
// Matched string
std::string_view sv() const { return sv_; }
// Definition name
const std::string &name() const { return name_; }
std::vector<unsigned int> tags;
// Line number and column at which the matched string is
std::pair<size_t, size_t> line_info() const {
const auto &idx = *source_line_index;
auto cur = static_cast<size_t>(std::distance(ss, sv_.data()));
auto it = std::lower_bound(
idx.begin(), idx.end(), cur,
[](size_t element, size_t value) { return element < value; });
auto id = static_cast<size_t>(std::distance(idx.begin(), it));
auto off = cur - (id == 0 ? 0 : idx[id - 1] + 1);
return std::pair(id + 1, off + 1);
}
// Choice count
size_t choice_count() const { return choice_count_; }
// Choice number (0 based index)
size_t choice() const { return choice_; }
// Tokens
std::vector<std::string_view> tokens;
std::string_view token(size_t id = 0) const {
if (tokens.empty()) { return sv_; }
assert(id < tokens.size());
return tokens[id];
}
// Token conversion
std::string token_to_string(size_t id = 0) const {
return std::string(token(id));
}
template <typename T> T token_to_number() const {
return token_to_number_<T>(token());
}
// Transform the semantic value vector to another vector
template <typename T>
std::vector<T> transform(size_t beg = 0,
size_t end = static_cast<size_t>(-1)) const {
std::vector<T> r;
end = (std::min)(end, size());
for (size_t i = beg; i < end; i++) {
r.emplace_back(std::any_cast<T>((*this)[i]));
}
return r;
}
using std::vector<std::any>::iterator;
using std::vector<std::any>::const_iterator;
using std::vector<std::any>::size;
using std::vector<std::any>::empty;
using std::vector<std::any>::assign;
using std::vector<std::any>::begin;
using std::vector<std::any>::end;
using std::vector<std::any>::rbegin;
using std::vector<std::any>::rend;
using std::vector<std::any>::operator[];
using std::vector<std::any>::at;
using std::vector<std::any>::resize;
using std::vector<std::any>::front;
using std::vector<std::any>::back;
using std::vector<std::any>::push_back;
using std::vector<std::any>::pop_back;
using std::vector<std::any>::insert;
using std::vector<std::any>::erase;
using std::vector<std::any>::clear;
using std::vector<std::any>::swap;
using std::vector<std::any>::emplace;
using std::vector<std::any>::emplace_back;
private:
friend class Context;
friend class Sequence;
friend class PrioritizedChoice;
friend class Holder;
friend class PrecedenceClimbing;
std::string_view sv_;
size_t choice_count_ = 0;
size_t choice_ = 0;
std::string name_;
};
/*
* Semantic action
*/
template <typename F, typename... Args> std::any call(F fn, Args &&... args) {
using R = decltype(fn(std::forward<Args>(args)...));
if constexpr (std::is_void<R>::value) {
fn(std::forward<Args>(args)...);
return std::any();
} else if constexpr (std::is_same<typename std::remove_cv<R>::type,
std::any>::value) {
return fn(std::forward<Args>(args)...);
} else {
return std::any(fn(std::forward<Args>(args)...));
}
}
template <typename T>
struct argument_count : argument_count<decltype(&T::operator())> {};
template <typename R, typename... Args>
struct argument_count<R (*)(Args...)>
: std::integral_constant<unsigned, sizeof...(Args)> {};
template <typename R, typename C, typename... Args>
struct argument_count<R (C::*)(Args...)>
: std::integral_constant<unsigned, sizeof...(Args)> {};
template <typename R, typename C, typename... Args>
struct argument_count<R (C::*)(Args...) const>
: std::integral_constant<unsigned, sizeof...(Args)> {};
class Action {
public:
Action() = default;
Action(Action &&rhs) = default;
template <typename F> Action(F fn) : fn_(make_adaptor(fn)) {}
template <typename F> void operator=(F fn) { fn_ = make_adaptor(fn); }
Action &operator=(const Action &rhs) = default;
operator bool() const { return bool(fn_); }
std::any operator()(SemanticValues &vs, std::any &dt) const {
return fn_(vs, dt);
}
private:
using Fty = std::function<std::any(SemanticValues &vs, std::any &dt)>;
template <typename F> Fty make_adaptor(F fn) {
if constexpr (argument_count<F>::value == 1) {
return [fn](auto &vs, auto & /*dt*/) { return call(fn, vs); };
} else {
return [fn](auto &vs, auto &dt) { return call(fn, vs, dt); };
}
}
Fty fn_;
};
/*
* Semantic predicate
*/
// Note: 'parse_error' exception class should be be used in sematic action
// handlers to reject the rule.
struct parse_error {
parse_error() = default;
parse_error(const char *s) : s_(s) {}
const char *what() const { return s_.empty() ? nullptr : s_.data(); }
private:
std::string s_;
};
/*
* Parse result helper
*/
inline bool success(size_t len) { return len != static_cast<size_t>(-1); }
inline bool fail(size_t len) { return len == static_cast<size_t>(-1); }
/*
* Log
*/
using Log = std::function<void(size_t, size_t, const std::string &)>;
/*
* ErrorInfo
*/
struct ErrorInfo {
const char *error_pos = nullptr;
std::vector<std::pair<const char *, bool>> expected_tokens;
const char *message_pos = nullptr;
std::string message;
mutable const char *last_output_pos = nullptr;
void clear() {
error_pos = nullptr;
expected_tokens.clear();
message_pos = nullptr;
message.clear();
}
void add(const char *token, bool is_literal) {
for (const auto &x : expected_tokens) {
if (x.first == token && x.second == is_literal) { return; }
}
expected_tokens.push_back(std::make_pair(token, is_literal));
}
void output_log(const Log &log, const char *s, size_t n) const {
if (message_pos) {
if (message_pos > last_output_pos) {
last_output_pos = message_pos;
auto line = line_info(s, message_pos);
std::string msg;
if (auto unexpected_token = heuristic_error_token(s, n, message_pos);
!unexpected_token.empty()) {
msg = replace_all(message, "%t", unexpected_token);
auto unexpected_char = unexpected_token.substr(
0, codepoint_length(unexpected_token.data(),
unexpected_token.size()));
msg = replace_all(msg, "%c", unexpected_char);
} else {
msg = message;
}
log(line.first, line.second, msg);
}
} else if (error_pos) {
if (error_pos > last_output_pos) {
last_output_pos = error_pos;
auto line = line_info(s, error_pos);
std::string msg;
if (expected_tokens.empty()) {
msg = "syntax error.";
} else {
msg = "syntax error";
// unexpected token
if (auto unexpected_token = heuristic_error_token(s, n, error_pos);
!unexpected_token.empty()) {
msg += ", unexpected '";
msg += unexpected_token;
msg += "'";
}
auto first_item = true;
size_t i = 0;
while (i < expected_tokens.size()) {
auto [token, is_literal] =
expected_tokens[expected_tokens.size() - i - 1];
// Skip rules start with '_'
if (!is_literal && token[0] != '_') {
msg += (first_item ? ", expecting " : ", ");
if (is_literal) {
msg += "'";
msg += token;
msg += "'";
} else {
msg += "<";
msg += token;
msg += ">";
}
first_item = false;
}
i++;
}
msg += ".";
}
log(line.first, line.second, msg);
}
}
}
private:
int cast_char(char c) const { return static_cast<unsigned char>(c); }
std::string heuristic_error_token(const char *s, size_t n,
const char *error_pos) const {
auto len = n - std::distance(s, error_pos);
if (len) {
size_t i = 0;
auto c = cast_char(error_pos[i++]);
if (!std::ispunct(c) && !std::isspace(c)) {
while (i < len && !std::ispunct(cast_char(error_pos[i])) &&
!std::isspace(cast_char(error_pos[i]))) {
i++;
}
}
size_t count = 8;
size_t j = 0;
while (count > 0 && j < i) {
j += codepoint_length(&error_pos[j], i - j);
count--;
}
return escape_characters(error_pos, j);
}
return std::string();
}
std::string replace_all(std::string str, const std::string &from,
const std::string &to) const {
size_t pos = 0;
while ((pos = str.find(from, pos)) != std::string::npos) {
str.replace(pos, from.length(), to);
pos += to.length();
}
return str;
}
};
/*
* Context
*/
class Context;
class Ope;
class Definition;
using TracerEnter = std::function<void(const Ope &name, const char *s, size_t n,
const SemanticValues &vs,
const Context &c, const std::any &dt)>;
using TracerLeave = std::function<void(
const Ope &ope, const char *s, size_t n, const SemanticValues &vs,
const Context &c, const std::any &dt, size_t)>;
class Context {
public:
const char *path;
const char *s;
const size_t l;
std::vector<size_t> source_line_index;
ErrorInfo error_info;
bool recovered = false;
std::vector<std::shared_ptr<SemanticValues>> value_stack;
size_t value_stack_size = 0;
std::vector<Definition *> rule_stack;
std::vector<std::vector<std::shared_ptr<Ope>>> args_stack;
size_t in_token_boundary_count = 0;
std::shared_ptr<Ope> whitespaceOpe;
bool in_whitespace = false;
std::shared_ptr<Ope> wordOpe;
std::vector<std::map<std::string_view, std::string>> capture_scope_stack;
size_t capture_scope_stack_size = 0;
std::vector<bool> cut_stack;
const size_t def_count;
const bool enablePackratParsing;
std::vector<bool> cache_registered;
std::vector<bool> cache_success;
std::map<std::pair<size_t, size_t>, std::tuple<size_t, std::any>>
cache_values;
TracerEnter tracer_enter;
TracerLeave tracer_leave;
Log log;
Context(const char *path, const char *s, size_t l, size_t def_count,
std::shared_ptr<Ope> whitespaceOpe, std::shared_ptr<Ope> wordOpe,
bool enablePackratParsing, TracerEnter tracer_enter,
TracerLeave tracer_leave, Log log)
: path(path), s(s), l(l), whitespaceOpe(whitespaceOpe), wordOpe(wordOpe),
def_count(def_count), enablePackratParsing(enablePackratParsing),
cache_registered(enablePackratParsing ? def_count * (l + 1) : 0),
cache_success(enablePackratParsing ? def_count * (l + 1) : 0),
tracer_enter(tracer_enter), tracer_leave(tracer_leave), log(log) {
for (size_t pos = 0; pos < l; pos++) {
if (s[pos] == '\n') { source_line_index.push_back(pos); }
}
source_line_index.push_back(l);
args_stack.resize(1);
push_capture_scope();
}
~Context() { assert(!value_stack_size); }
Context(const Context &) = delete;
Context(Context &&) = delete;
Context operator=(const Context &) = delete;
template <typename T>
void packrat(const char *a_s, size_t def_id, size_t &len, std::any &val,
T fn) {
if (!enablePackratParsing) {
fn(val);
return;
}
auto col = a_s - s;
auto idx = def_count * static_cast<size_t>(col) + def_id;
if (cache_registered[idx]) {
if (cache_success[idx]) {
auto key = std::pair(col, def_id);
std::tie(len, val) = cache_values[key];
return;
} else {
len = static_cast<size_t>(-1);
return;
}
} else {
fn(val);
cache_registered[idx] = true;
cache_success[idx] = success(len);
if (success(len)) {
auto key = std::pair(col, def_id);
cache_values[key] = std::pair(len, val);
}
return;
}
}
SemanticValues &push() {
assert(value_stack_size <= value_stack.size());
if (value_stack_size == value_stack.size()) {
value_stack.emplace_back(std::make_shared<SemanticValues>());
} else {
auto &vs = *value_stack[value_stack_size];
if (!vs.empty()) {
vs.clear();
if (!vs.tags.empty()) { vs.tags.clear(); }
}
vs.sv_ = std::string_view();
vs.choice_count_ = 0;
vs.choice_ = 0;
if (!vs.tokens.empty()) { vs.tokens.clear(); }
}
auto &vs = *value_stack[value_stack_size++];
vs.path = path;
vs.ss = s;
vs.source_line_index = &source_line_index;
return vs;
}
void pop() { value_stack_size--; }
void push_args(std::vector<std::shared_ptr<Ope>> &&args) {
args_stack.emplace_back(args);
}
void pop_args() { args_stack.pop_back(); }
const std::vector<std::shared_ptr<Ope>> &top_args() const {
return args_stack[args_stack.size() - 1];
}
void push_capture_scope() {
assert(capture_scope_stack_size <= capture_scope_stack.size());
if (capture_scope_stack_size == capture_scope_stack.size()) {
capture_scope_stack.emplace_back(
std::map<std::string_view, std::string>());
} else {
auto &cs = capture_scope_stack[capture_scope_stack_size];
if (!cs.empty()) { cs.clear(); }
}
capture_scope_stack_size++;
}
void pop_capture_scope() { capture_scope_stack_size--; }
void shift_capture_values() {
assert(capture_scope_stack.size() >= 2);
auto curr = &capture_scope_stack[capture_scope_stack_size - 1];
auto prev = curr - 1;
for (const auto &kv : *curr) {
(*prev)[kv.first] = kv.second;
}
}
void set_error_pos(const char *a_s, const char *literal = nullptr);
// void trace_enter(const char *name, const char *a_s, size_t n,
void trace_enter(const Ope &ope, const char *a_s, size_t n,
SemanticValues &vs, std::any &dt) const;
// void trace_leave(const char *name, const char *a_s, size_t n,
void trace_leave(const Ope &ope, const char *a_s, size_t n,
SemanticValues &vs, std::any &dt, size_t len) const;
bool is_traceable(const Ope &ope) const;
mutable size_t next_trace_id = 0;
mutable std::list<size_t> trace_ids;
};
/*
* Parser operators
*/
class Ope {
public:
struct Visitor;
virtual ~Ope() {}
size_t parse(const char *s, size_t n, SemanticValues &vs, Context &c,
std::any &dt) const;
virtual size_t parse_core(const char *s, size_t n, SemanticValues &vs,
Context &c, std::any &dt) const = 0;
virtual void accept(Visitor &v) = 0;
};
class Sequence : public Ope {
public:
template <typename... Args>
Sequence(const Args &... args)
: opes_{static_cast<std::shared_ptr<Ope>>(args)...} {}
Sequence(const std::vector<std::shared_ptr<Ope>> &opes) : opes_(opes) {}
Sequence(std::vector<std::shared_ptr<Ope>> &&opes) : opes_(opes) {}
size_t parse_core(const char *s, size_t n, SemanticValues &vs, Context &c,
std::any &dt) const override {
auto &chldsv = c.push();
auto pop_se = scope_exit([&]() { c.pop(); });
size_t i = 0;
for (const auto &ope : opes_) {
const auto &rule = *ope;
auto len = rule.parse(s + i, n - i, chldsv, c, dt);
if (fail(len)) { return len; }
i += len;
}
if (!chldsv.empty()) {
for (size_t j = 0; j < chldsv.size(); j++) {
vs.emplace_back(std::move(chldsv[j]));
}
}
if (!chldsv.tags.empty()) {
for (size_t j = 0; j < chldsv.tags.size(); j++) {
vs.tags.emplace_back(std::move(chldsv.tags[j]));
}
}
vs.sv_ = chldsv.sv_;
if (!chldsv.tokens.empty()) {
for (size_t j = 0; j < chldsv.tokens.size(); j++) {
vs.tokens.emplace_back(std::move(chldsv.tokens[j]));
}
}
return i;
}
void accept(Visitor &v) override;
std::vector<std::shared_ptr<Ope>> opes_;
};
class PrioritizedChoice : public Ope {
public:
template <typename... Args>
PrioritizedChoice(bool for_label, const Args &... args)
: opes_{static_cast<std::shared_ptr<Ope>>(args)...},
for_label_(for_label) {}
PrioritizedChoice(const std::vector<std::shared_ptr<Ope>> &opes)
: opes_(opes) {}
PrioritizedChoice(std::vector<std::shared_ptr<Ope>> &&opes) : opes_(opes) {}
size_t parse_core(const char *s, size_t n, SemanticValues &vs, Context &c,
std::any &dt) const override {
size_t len = static_cast<size_t>(-1);
if (!for_label_) { c.cut_stack.push_back(false); }
size_t id = 0;
for (const auto &ope : opes_) {
if (!c.cut_stack.empty()) { c.cut_stack.back() = false; }
auto &chldsv = c.push();
c.push_capture_scope();
auto se = scope_exit([&]() {
c.pop();
c.pop_capture_scope();
});
len = ope->parse(s, n, chldsv, c, dt);
if (success(len)) {
if (!chldsv.empty()) {
for (size_t i = 0; i < chldsv.size(); i++) {
vs.emplace_back(std::move(chldsv[i]));
}
}
if (!chldsv.tags.empty()) {
for (size_t i = 0; i < chldsv.tags.size(); i++) {
vs.tags.emplace_back(std::move(chldsv.tags[i]));
}
}
vs.sv_ = chldsv.sv_;
vs.choice_count_ = opes_.size();
vs.choice_ = id;
if (!chldsv.tokens.empty()) {
for (size_t i = 0; i < chldsv.tokens.size(); i++) {
vs.tokens.emplace_back(std::move(chldsv.tokens[i]));
}
}
c.shift_capture_values();
break;
} else if (!c.cut_stack.empty() && c.cut_stack.back()) {
break;
}
id++;
}
if (!for_label_) { c.cut_stack.pop_back(); }
return len;
}
void accept(Visitor &v) override;
size_t size() const { return opes_.size(); }
std::vector<std::shared_ptr<Ope>> opes_;
bool for_label_ = false;
};
class Repetition : public Ope {
public:
Repetition(const std::shared_ptr<Ope> &ope, size_t min, size_t max)
: ope_(ope), min_(min), max_(max) {}
size_t parse_core(const char *s, size_t n, SemanticValues &vs, Context &c,
std::any &dt) const override {
size_t count = 0;
size_t i = 0;
while (count < min_) {
c.push_capture_scope();
auto se = scope_exit([&]() { c.pop_capture_scope(); });
const auto &rule = *ope_;
auto len = rule.parse(s + i, n - i, vs, c, dt);
if (success(len)) {
c.shift_capture_values();
} else {
return len;
}
i += len;
count++;
}
while (n - i > 0 && count < max_) {
c.push_capture_scope();
auto se = scope_exit([&]() { c.pop_capture_scope(); });
auto save_sv_size = vs.size();
auto save_tok_size = vs.tokens.size();
const auto &rule = *ope_;
auto len = rule.parse(s + i, n - i, vs, c, dt);
if (success(len)) {
c.shift_capture_values();
} else {
if (vs.size() != save_sv_size) {
vs.erase(vs.begin() + static_cast<std::ptrdiff_t>(save_sv_size));
vs.tags.erase(vs.tags.begin() +
static_cast<std::ptrdiff_t>(save_sv_size));
}
if (vs.tokens.size() != save_tok_size) {
vs.tokens.erase(vs.tokens.begin() +
static_cast<std::ptrdiff_t>(save_tok_size));
}
break;
}
i += len;
count++;
}
return i;
}
void accept(Visitor &v) override;
bool is_zom() const {
return min_ == 0 && max_ == std::numeric_limits<size_t>::max();
}
static std::shared_ptr<Repetition> zom(const std::shared_ptr<Ope> &ope) {
return std::make_shared<Repetition>(ope, 0,
std::numeric_limits<size_t>::max());
}
static std::shared_ptr<Repetition> oom(const std::shared_ptr<Ope> &ope) {
return std::make_shared<Repetition>(ope, 1,
std::numeric_limits<size_t>::max());
}
static std::shared_ptr<Repetition> opt(const std::shared_ptr<Ope> &ope) {
return std::make_shared<Repetition>(ope, 0, 1);
}
std::shared_ptr<Ope> ope_;
size_t min_;
size_t max_;
};
class AndPredicate : public Ope {
public:
AndPredicate(const std::shared_ptr<Ope> &ope) : ope_(ope) {}
size_t parse_core(const char *s, size_t n, SemanticValues & /*vs*/,
Context &c, std::any &dt) const override {
auto &chldsv = c.push();
c.push_capture_scope();
auto se = scope_exit([&]() {
c.pop();
c.pop_capture_scope();
});
const auto &rule = *ope_;
auto len = rule.parse(s, n, chldsv, c, dt);
if (success(len)) {
return 0;
} else {
return len;
}
}
void accept(Visitor &v) override;
std::shared_ptr<Ope> ope_;
};
class NotPredicate : public Ope {
public:
NotPredicate(const std::shared_ptr<Ope> &ope) : ope_(ope) {}
size_t parse_core(const char *s, size_t n, SemanticValues & /*vs*/,
Context &c, std::any &dt) const override {
auto &chldsv = c.push();
c.push_capture_scope();
auto se = scope_exit([&]() {
c.pop();
c.pop_capture_scope();
});
auto len = ope_->parse(s, n, chldsv, c, dt);
if (success(len)) {
c.set_error_pos(s);
return static_cast<size_t>(-1);
} else {
return 0;
}
}
void accept(Visitor &v) override;
std::shared_ptr<Ope> ope_;
};
class Dictionary : public Ope, public std::enable_shared_from_this<Dictionary> {
public:
Dictionary(const std::vector<std::string> &v) : trie_(v) {}
size_t parse_core(const char *s, size_t n, SemanticValues &vs, Context &c,
std::any &dt) const override;
void accept(Visitor &v) override;
Trie trie_;
};
class LiteralString : public Ope,
public std::enable_shared_from_this<LiteralString> {
public:
LiteralString(std::string &&s, bool ignore_case)
: lit_(s), ignore_case_(ignore_case), is_word_(false) {}
LiteralString(const std::string &s, bool ignore_case)
: lit_(s), ignore_case_(ignore_case), is_word_(false) {}
size_t parse_core(const char *s, size_t n, SemanticValues &vs, Context &c,
std::any &dt) const override;
void accept(Visitor &v) override;
std::string lit_;
bool ignore_case_;
mutable std::once_flag init_is_word_;
mutable bool is_word_;
};
class CharacterClass : public Ope,
public std::enable_shared_from_this<CharacterClass> {
public:
CharacterClass(const std::string &s, bool negated) : negated_(negated) {
auto chars = decode(s.data(), s.length());
auto i = 0u;
while (i < chars.size()) {
if (i + 2 < chars.size() && chars[i + 1] == '-') {
auto cp1 = chars[i];
auto cp2 = chars[i + 2];
ranges_.emplace_back(std::pair(cp1, cp2));
i += 3;
} else {
auto cp = chars[i];
ranges_.emplace_back(std::pair(cp, cp));
i += 1;
}
}
assert(!ranges_.empty());
}
CharacterClass(const std::vector<std::pair<char32_t, char32_t>> &ranges,
bool negated)
: ranges_(ranges), negated_(negated) {
assert(!ranges_.empty());
}
size_t parse_core(const char *s, size_t n, SemanticValues & /*vs*/,
Context &c, std::any & /*dt*/) const override {
if (n < 1) {
c.set_error_pos(s);
return static_cast<size_t>(-1);
}
char32_t cp = 0;
auto len = decode_codepoint(s, n, cp);
for (const auto &range : ranges_) {
if (range.first <= cp && cp <= range.second) {
if (negated_) {
c.set_error_pos(s);
return static_cast<size_t>(-1);
} else {
return len;
}
}
}
if (negated_) {
return len;
} else {
c.set_error_pos(s);
return static_cast<size_t>(-1);
}
}
void accept(Visitor &v) override;
std::vector<std::pair<char32_t, char32_t>> ranges_;
bool negated_;
};
class Character : public Ope, public std::enable_shared_from_this<Character> {
public:
Character(char ch) : ch_(ch) {}
size_t parse_core(const char *s, size_t n, SemanticValues & /*vs*/,
Context &c, std::any & /*dt*/) const override {
if (n < 1 || s[0] != ch_) {
c.set_error_pos(s);
return static_cast<size_t>(-1);
}
return 1;
}
void accept(Visitor &v) override;
char ch_;
};
class AnyCharacter : public Ope,
public std::enable_shared_from_this<AnyCharacter> {
public:
size_t parse_core(const char *s, size_t n, SemanticValues & /*vs*/,
Context &c, std::any & /*dt*/) const override {
auto len = codepoint_length(s, n);
if (len < 1) {
c.set_error_pos(s);
return static_cast<size_t>(-1);
}
return len;
}
void accept(Visitor &v) override;
};
class CaptureScope : public Ope {
public:
CaptureScope(const std::shared_ptr<Ope> &ope) : ope_(ope) {}
size_t parse_core(const char *s, size_t n, SemanticValues &vs, Context &c,
std::any &dt) const override {
c.push_capture_scope();
auto se = scope_exit([&]() { c.pop_capture_scope(); });
const auto &rule = *ope_;
auto len = rule.parse(s, n, vs, c, dt);
return len;
}
void accept(Visitor &v) override;
std::shared_ptr<Ope> ope_;
};
class Capture : public Ope {
public:
using MatchAction = std::function<void(const char *s, size_t n, Context &c)>;
Capture(const std::shared_ptr<Ope> &ope, MatchAction ma)
: ope_(ope), match_action_(ma) {}
size_t parse_core(const char *s, size_t n, SemanticValues &vs, Context &c,
std::any &dt) const override {
const auto &rule = *ope_;
auto len = rule.parse(s, n, vs, c, dt);
if (success(len) && match_action_) { match_action_(s, len, c); }
return len;
}
void accept(Visitor &v) override;
std::shared_ptr<Ope> ope_;
MatchAction match_action_;
};
class TokenBoundary : public Ope {
public:
TokenBoundary(const std::shared_ptr<Ope> &ope) : ope_(ope) {}
size_t parse_core(const char *s, size_t n, SemanticValues &vs, Context &c,
std::any &dt) const override;
void accept(Visitor &v) override;
std::shared_ptr<Ope> ope_;
};
class Ignore : public Ope {
public:
Ignore(const std::shared_ptr<Ope> &ope) : ope_(ope) {}
size_t parse_core(const char *s, size_t n, SemanticValues & /*vs*/,
Context &c, std::any &dt) const override {
const auto &rule = *ope_;
auto &chldsv = c.push();
auto se = scope_exit([&]() { c.pop(); });
return rule.parse(s, n, chldsv, c, dt);
}
void accept(Visitor &v) override;
std::shared_ptr<Ope> ope_;
};
using Parser = std::function<size_t(const char *s, size_t n, SemanticValues &vs,
std::any &dt)>;
class User : public Ope {
public:
User(Parser fn) : fn_(fn) {}
size_t parse_core(const char *s, size_t n, SemanticValues &vs,
Context & /*c*/, std::any &dt) const override {
assert(fn_);
return fn_(s, n, vs, dt);
}
void accept(Visitor &v) override;
std::function<size_t(const char *s, size_t n, SemanticValues &vs,
std::any &dt)>
fn_;
};
class WeakHolder : public Ope {
public:
WeakHolder(const std::shared_ptr<Ope> &ope) : weak_(ope) {}
size_t parse_core(const char *s, size_t n, SemanticValues &vs, Context &c,
std::any &dt) const override {
auto ope = weak_.lock();
assert(ope);
const auto &rule = *ope;
return rule.parse(s, n, vs, c, dt);
}
void accept(Visitor &v) override;
std::weak_ptr<Ope> weak_;
};
class Holder : public Ope {
public:
Holder(Definition *outer) : outer_(outer) {}
size_t parse_core(const char *s, size_t n, SemanticValues &vs, Context &c,
std::any &dt) const override;
void accept(Visitor &v) override;
std::any reduce(SemanticValues &vs, std::any &dt) const;
const char *trace_name() const;
std::shared_ptr<Ope> ope_;
Definition *outer_;
mutable std::string trace_name_;
friend class Definition;
};
using Grammar = std::unordered_map<std::string, Definition>;
class Reference : public Ope, public std::enable_shared_from_this<Reference> {
public:
Reference(const Grammar &grammar, const std::string &name, const char *s,
bool is_macro, const std::vector<std::shared_ptr<Ope>> &args)
: grammar_(grammar), name_(name), s_(s), is_macro_(is_macro), args_(args),
rule_(nullptr), iarg_(0) {}
size_t parse_core(const char *s, size_t n, SemanticValues &vs, Context &c,
std::any &dt) const override;
void accept(Visitor &v) override;
std::shared_ptr<Ope> get_core_operator() const;
const Grammar &grammar_;
const std::string name_;
const char *s_;
const bool is_macro_;
const std::vector<std::shared_ptr<Ope>> args_;
Definition *rule_;
size_t iarg_;
};
class Whitespace : public Ope {
public:
Whitespace(const std::shared_ptr<Ope> &ope) : ope_(ope) {}
size_t parse_core(const char *s, size_t n, SemanticValues &vs, Context &c,
std::any &dt) const override {
if (c.in_whitespace) { return 0; }
c.in_whitespace = true;
auto se = scope_exit([&]() { c.in_whitespace = false; });
const auto &rule = *ope_;
return rule.parse(s, n, vs, c, dt);
}
void accept(Visitor &v) override;
std::shared_ptr<Ope> ope_;
};
class BackReference : public Ope {
public:
BackReference(std::string &&name) : name_(name) {}
BackReference(const std::string &name) : name_(name) {}
size_t parse_core(const char *s, size_t n, SemanticValues &vs, Context &c,
std::any &dt) const override;
void accept(Visitor &v) override;
std::string name_;
};
class PrecedenceClimbing : public Ope {
public:
using BinOpeInfo = std::map<std::string_view, std::pair<size_t, char>>;
PrecedenceClimbing(const std::shared_ptr<Ope> &atom,
const std::shared_ptr<Ope> &binop, const BinOpeInfo &info,
const Definition &rule)
: atom_(atom), binop_(binop), info_(info), rule_(rule) {}
size_t parse_core(const char *s, size_t n, SemanticValues &vs, Context &c,
std::any &dt) const override {
return parse_expression(s, n, vs, c, dt, 0);
}
void accept(Visitor &v) override;
std::shared_ptr<Ope> atom_;
std::shared_ptr<Ope> binop_;
BinOpeInfo info_;
const Definition &rule_;
private:
size_t parse_expression(const char *s, size_t n, SemanticValues &vs,
Context &c, std::any &dt, size_t min_prec) const;
Definition &get_reference_for_binop(Context &c) const;
};
class Recovery : public Ope {
public:
Recovery(const std::shared_ptr<Ope> &ope) : ope_(ope) {}
size_t parse_core(const char *s, size_t n, SemanticValues &vs, Context &c,
std::any &dt) const override;
void accept(Visitor &v) override;
std::shared_ptr<Ope> ope_;
};
class Cut : public Ope, public std::enable_shared_from_this<Cut> {
public:
size_t parse_core(const char * /*s*/, size_t /*n*/, SemanticValues & /*vs*/,
Context &c, std::any & /*dt*/) const override {
c.cut_stack.back() = true;
return 0;
}
void accept(Visitor &v) override;
};
/*
* Factories
*/
template <typename... Args> std::shared_ptr<Ope> seq(Args &&... args) {
return std::make_shared<Sequence>(static_cast<std::shared_ptr<Ope>>(args)...);
}
template <typename... Args> std::shared_ptr<Ope> cho(Args &&... args) {
return std::make_shared<PrioritizedChoice>(
false, static_cast<std::shared_ptr<Ope>>(args)...);
}
template <typename... Args> std::shared_ptr<Ope> cho4label_(Args &&... args) {
return std::make_shared<PrioritizedChoice>(
true, static_cast<std::shared_ptr<Ope>>(args)...);
}
inline std::shared_ptr<Ope> zom(const std::shared_ptr<Ope> &ope) {
return Repetition::zom(ope);
}
inline std::shared_ptr<Ope> oom(const std::shared_ptr<Ope> &ope) {
return Repetition::oom(ope);
}
inline std::shared_ptr<Ope> opt(const std::shared_ptr<Ope> &ope) {
return Repetition::opt(ope);
}
inline std::shared_ptr<Ope> rep(const std::shared_ptr<Ope> &ope, size_t min,
size_t max) {
return std::make_shared<Repetition>(ope, min, max);
}
inline std::shared_ptr<Ope> apd(const std::shared_ptr<Ope> &ope) {
return std::make_shared<AndPredicate>(ope);
}
inline std::shared_ptr<Ope> npd(const std::shared_ptr<Ope> &ope) {
return std::make_shared<NotPredicate>(ope);
}
inline std::shared_ptr<Ope> dic(const std::vector<std::string> &v) {
return std::make_shared<Dictionary>(v);
}
inline std::shared_ptr<Ope> lit(std::string &&s) {
return std::make_shared<LiteralString>(s, false);
}
inline std::shared_ptr<Ope> liti(std::string &&s) {
return std::make_shared<LiteralString>(s, true);
}
inline std::shared_ptr<Ope> cls(const std::string &s) {
return std::make_shared<CharacterClass>(s, false);
}
inline std::shared_ptr<Ope>
cls(const std::vector<std::pair<char32_t, char32_t>> &ranges) {
return std::make_shared<CharacterClass>(ranges, false);
}
inline std::shared_ptr<Ope> ncls(const std::string &s) {
return std::make_shared<CharacterClass>(s, true);
}
inline std::shared_ptr<Ope>
ncls(const std::vector<std::pair<char32_t, char32_t>> &ranges) {
return std::make_shared<CharacterClass>(ranges, true);
}
inline std::shared_ptr<Ope> chr(char dt) {
return std::make_shared<Character>(dt);
}
inline std::shared_ptr<Ope> dot() { return std::make_shared<AnyCharacter>(); }
inline std::shared_ptr<Ope> csc(const std::shared_ptr<Ope> &ope) {
return std::make_shared<CaptureScope>(ope);
}
inline std::shared_ptr<Ope> cap(const std::shared_ptr<Ope> &ope,
Capture::MatchAction ma) {
return std::make_shared<Capture>(ope, ma);
}
inline std::shared_ptr<Ope> tok(const std::shared_ptr<Ope> &ope) {
return std::make_shared<TokenBoundary>(ope);
}
inline std::shared_ptr<Ope> ign(const std::shared_ptr<Ope> &ope) {
return std::make_shared<Ignore>(ope);
}
inline std::shared_ptr<Ope>
usr(std::function<size_t(const char *s, size_t n, SemanticValues &vs,
std::any &dt)>
fn) {
return std::make_shared<User>(fn);
}
inline std::shared_ptr<Ope> ref(const Grammar &grammar, const std::string &name,
const char *s, bool is_macro,
const std::vector<std::shared_ptr<Ope>> &args) {
return std::make_shared<Reference>(grammar, name, s, is_macro, args);
}
inline std::shared_ptr<Ope> wsp(const std::shared_ptr<Ope> &ope) {
return std::make_shared<Whitespace>(std::make_shared<Ignore>(ope));
}
inline std::shared_ptr<Ope> bkr(std::string &&name) {
return std::make_shared<BackReference>(name);
}
inline std::shared_ptr<Ope> pre(const std::shared_ptr<Ope> &atom,
const std::shared_ptr<Ope> &binop,
const PrecedenceClimbing::BinOpeInfo &info,
const Definition &rule) {
return std::make_shared<PrecedenceClimbing>(atom, binop, info, rule);
}
inline std::shared_ptr<Ope> rec(const std::shared_ptr<Ope> &ope) {
return std::make_shared<Recovery>(ope);
}
inline std::shared_ptr<Ope> cut() { return std::make_shared<Cut>(); }
/*
* Visitor
*/
struct Ope::Visitor {
virtual ~Visitor() {}
virtual void visit(Sequence &) {}
virtual void visit(PrioritizedChoice &) {}
virtual void visit(Repetition &) {}
virtual void visit(AndPredicate &) {}
virtual void visit(NotPredicate &) {}
virtual void visit(Dictionary &) {}
virtual void visit(LiteralString &) {}
virtual void visit(CharacterClass &) {}
virtual void visit(Character &) {}
virtual void visit(AnyCharacter &) {}
virtual void visit(CaptureScope &) {}
virtual void visit(Capture &) {}
virtual void visit(TokenBoundary &) {}
virtual void visit(Ignore &) {}
virtual void visit(User &) {}
virtual void visit(WeakHolder &) {}
virtual void visit(Holder &) {}
virtual void visit(Reference &) {}
virtual void visit(Whitespace &) {}
virtual void visit(BackReference &) {}
virtual void visit(PrecedenceClimbing &) {}
virtual void visit(Recovery &) {}
virtual void visit(Cut &) {}
};
struct IsReference : public Ope::Visitor {
void visit(Reference &) override { is_reference_ = true; }
static bool check(Ope &ope) {
IsReference vis;
ope.accept(vis);
return vis.is_reference_;
}
private:
bool is_reference_ = false;
};
struct TraceOpeName : public Ope::Visitor {
void visit(Sequence &) override { name_ = "Sequence"; }
void visit(PrioritizedChoice &) override { name_ = "PrioritizedChoice"; }
void visit(Repetition &) override { name_ = "Repetition"; }
void visit(AndPredicate &) override { name_ = "AndPredicate"; }
void visit(NotPredicate &) override { name_ = "NotPredicate"; }
void visit(Dictionary &) override { name_ = "Dictionary"; }
void visit(LiteralString &) override { name_ = "LiteralString"; }
void visit(CharacterClass &) override { name_ = "CharacterClass"; }
void visit(Character &) override { name_ = "Character"; }
void visit(AnyCharacter &) override { name_ = "AnyCharacter"; }
void visit(CaptureScope &) override { name_ = "CaptureScope"; }
void visit(Capture &) override { name_ = "Capture"; }
void visit(TokenBoundary &) override { name_ = "TokenBoundary"; }
void visit(Ignore &) override { name_ = "Ignore"; }
void visit(User &) override { name_ = "User"; }
void visit(WeakHolder &) override { name_ = "WeakHolder"; }
void visit(Holder &ope) override { name_ = ope.trace_name(); }
void visit(Reference &) override { name_ = "Reference"; }
void visit(Whitespace &) override { name_ = "Whitespace"; }
void visit(BackReference &) override { name_ = "BackReference"; }
void visit(PrecedenceClimbing &) override { name_ = "PrecedenceClimbing"; }
void visit(Recovery &) override { name_ = "Recovery"; }
void visit(Cut &) override { name_ = "Cut"; }
static std::string get(Ope &ope) {
TraceOpeName vis;
ope.accept(vis);
return vis.name_;
}
private:
const char *name_ = nullptr;
};
struct AssignIDToDefinition : public Ope::Visitor {
void visit(Sequence &ope) override {
for (auto op : ope.opes_) {
op->accept(*this);
}
}
void visit(PrioritizedChoice &ope) override {
for (auto op : ope.opes_) {
op->accept(*this);
}
}
void visit(Repetition &ope) override { ope.ope_->accept(*this); }
void visit(AndPredicate &ope) override { ope.ope_->accept(*this); }
void visit(NotPredicate &ope) override { ope.ope_->accept(*this); }
void visit(CaptureScope &ope) override { ope.ope_->accept(*this); }
void visit(Capture &ope) override { ope.ope_->accept(*this); }
void visit(TokenBoundary &ope) override { ope.ope_->accept(*this); }
void visit(Ignore &ope) override { ope.ope_->accept(*this); }
void visit(WeakHolder &ope) override { ope.weak_.lock()->accept(*this); }
void visit(Holder &ope) override;
void visit(Reference &ope) override;
void visit(Whitespace &ope) override { ope.ope_->accept(*this); }
void visit(PrecedenceClimbing &ope) override;
void visit(Recovery &ope) override { ope.ope_->accept(*this); }
std::unordered_map<void *, size_t> ids;
};
struct IsLiteralToken : public Ope::Visitor {
void visit(PrioritizedChoice &ope) override {
for (auto op : ope.opes_) {
if (!IsLiteralToken::check(*op)) { return; }
}
result_ = true;
}
void visit(Dictionary &) override { result_ = true; }
void visit(LiteralString &) override { result_ = true; }
static bool check(Ope &ope) {
IsLiteralToken vis;
ope.accept(vis);
return vis.result_;
}
private:
bool result_ = false;
};
struct TokenChecker : public Ope::Visitor {
void visit(Sequence &ope) override {
for (auto op : ope.opes_) {
op->accept(*this);
}
}
void visit(PrioritizedChoice &ope) override {
for (auto op : ope.opes_) {
op->accept(*this);
}
}
void visit(Repetition &ope) override { ope.ope_->accept(*this); }
void visit(CaptureScope &ope) override { ope.ope_->accept(*this); }
void visit(Capture &ope) override { ope.ope_->accept(*this); }
void visit(TokenBoundary &) override { has_token_boundary_ = true; }
void visit(Ignore &ope) override { ope.ope_->accept(*this); }
void visit(WeakHolder &) override { has_rule_ = true; }
void visit(Holder &ope) override { ope.ope_->accept(*this); }
void visit(Reference &ope) override;
void visit(Whitespace &ope) override { ope.ope_->accept(*this); }
void visit(PrecedenceClimbing &ope) override { ope.atom_->accept(*this); }
void visit(Recovery &ope) override { ope.ope_->accept(*this); }
static bool is_token(Ope &ope) {
if (IsLiteralToken::check(ope)) { return true; }
TokenChecker vis;
ope.accept(vis);
return vis.has_token_boundary_ || !vis.has_rule_;
}
private:
bool has_token_boundary_ = false;
bool has_rule_ = false;
};
struct FindLiteralToken : public Ope::Visitor {
void visit(LiteralString &ope) override { token_ = ope.lit_.c_str(); }
void visit(TokenBoundary &ope) override { ope.ope_->accept(*this); }
void visit(Ignore &ope) override { ope.ope_->accept(*this); }
void visit(Reference &ope) override;
void visit(Recovery &ope) override { ope.ope_->accept(*this); }
static const char *token(Ope &ope) {
FindLiteralToken vis;
ope.accept(vis);
return vis.token_;
}
private:
const char *token_ = nullptr;
};
struct DetectLeftRecursion : public Ope::Visitor {
DetectLeftRecursion(const std::string &name) : name_(name) {}
void visit(Sequence &ope) override {
for (auto op : ope.opes_) {
op->accept(*this);
if (done_) {
break;
} else if (error_s) {
done_ = true;
break;
}
}
}
void visit(PrioritizedChoice &ope) override {
for (auto op : ope.opes_) {
op->accept(*this);
if (error_s) {
done_ = true;
break;
}
}
}
void visit(Repetition &ope) override {
ope.ope_->accept(*this);
done_ = ope.min_ > 0;
}
void visit(AndPredicate &ope) override {
ope.ope_->accept(*this);
done_ = false;
}
void visit(NotPredicate &ope) override {
ope.ope_->accept(*this);
done_ = false;
}
void visit(Dictionary &) override { done_ = true; }
void visit(LiteralString &ope) override { done_ = !ope.lit_.empty(); }
void visit(CharacterClass &) override { done_ = true; }
void visit(Character &) override { done_ = true; }
void visit(AnyCharacter &) override { done_ = true; }
void visit(CaptureScope &ope) override { ope.ope_->accept(*this); }
void visit(Capture &ope) override { ope.ope_->accept(*this); }
void visit(TokenBoundary &ope) override { ope.ope_->accept(*this); }
void visit(Ignore &ope) override { ope.ope_->accept(*this); }
void visit(User &) override { done_ = true; }
void visit(WeakHolder &ope) override { ope.weak_.lock()->accept(*this); }
void visit(Holder &ope) override { ope.ope_->accept(*this); }
void visit(Reference &ope) override;
void visit(Whitespace &ope) override { ope.ope_->accept(*this); }
void visit(BackReference &) override { done_ = true; }
void visit(PrecedenceClimbing &ope) override { ope.atom_->accept(*this); }
void visit(Recovery &ope) override { ope.ope_->accept(*this); }
void visit(Cut &) override { done_ = true; }
const char *error_s = nullptr;
private:
std::string name_;
std::set<std::string> refs_;
bool done_ = false;
};
struct HasEmptyElement : public Ope::Visitor {
HasEmptyElement(std::list<std::pair<const char *, std::string>> &refs)
: refs_(refs) {}
void visit(Sequence &ope) override {
auto save_is_empty = false;
const char *save_error_s = nullptr;
std::string save_error_name;
for (auto op : ope.opes_) {
op->accept(*this);
if (!is_empty) { return; }
save_is_empty = is_empty;
save_error_s = error_s;
save_error_name = error_name;
is_empty = false;
error_name.clear();
}
is_empty = save_is_empty;
error_s = save_error_s;
error_name = save_error_name;
}
void visit(PrioritizedChoice &ope) override {
for (auto op : ope.opes_) {
op->accept(*this);
if (is_empty) { return; }
}
}
void visit(Repetition &ope) override {
if (ope.min_ == 0) {
set_error();
} else {
ope.ope_->accept(*this);
}
}
void visit(AndPredicate &) override { set_error(); }
void visit(NotPredicate &) override { set_error(); }
void visit(LiteralString &ope) override {
if (ope.lit_.empty()) { set_error(); }
}
void visit(CaptureScope &ope) override { ope.ope_->accept(*this); }
void visit(Capture &ope) override { ope.ope_->accept(*this); }
void visit(TokenBoundary &ope) override { ope.ope_->accept(*this); }
void visit(Ignore &ope) override { ope.ope_->accept(*this); }
void visit(WeakHolder &ope) override { ope.weak_.lock()->accept(*this); }
void visit(Holder &ope) override { ope.ope_->accept(*this); }
void visit(Reference &ope) override;
void visit(Whitespace &ope) override { ope.ope_->accept(*this); }
void visit(PrecedenceClimbing &ope) override { ope.atom_->accept(*this); }
void visit(Recovery &ope) override { ope.ope_->accept(*this); }
bool is_empty = false;
const char *error_s = nullptr;
std::string error_name;
private:
void set_error() {
is_empty = true;
error_s = refs_.back().first;
error_name = refs_.back().second;
}
std::list<std::pair<const char *, std::string>> &refs_;
};
struct DetectInfiniteLoop : public Ope::Visitor {
DetectInfiniteLoop(const char *s, const std::string &name) {
refs_.emplace_back(s, name);
}
void visit(Sequence &ope) override {
for (auto op : ope.opes_) {
op->accept(*this);
if (has_error) { return; }
}
}
void visit(PrioritizedChoice &ope) override {
for (auto op : ope.opes_) {
op->accept(*this);
if (has_error) { return; }
}
}
void visit(Repetition &ope) override {
if (ope.max_ == std::numeric_limits<size_t>::max()) {
HasEmptyElement vis(refs_);
ope.ope_->accept(vis);
if (vis.is_empty) {
has_error = true;
error_s = vis.error_s;
error_name = vis.error_name;
}
} else {
ope.ope_->accept(*this);
}
}
void visit(AndPredicate &ope) override { ope.ope_->accept(*this); }
void visit(NotPredicate &ope) override { ope.ope_->accept(*this); }
void visit(CaptureScope &ope) override { ope.ope_->accept(*this); }
void visit(Capture &ope) override { ope.ope_->accept(*this); }
void visit(TokenBoundary &ope) override { ope.ope_->accept(*this); }
void visit(Ignore &ope) override { ope.ope_->accept(*this); }
void visit(WeakHolder &ope) override { ope.weak_.lock()->accept(*this); }
void visit(Holder &ope) override { ope.ope_->accept(*this); }
void visit(Reference &ope) override;
void visit(Whitespace &ope) override { ope.ope_->accept(*this); }
void visit(PrecedenceClimbing &ope) override { ope.atom_->accept(*this); }
void visit(Recovery &ope) override { ope.ope_->accept(*this); }
bool has_error = false;
const char *error_s = nullptr;
std::string error_name;
private:
std::list<std::pair<const char *, std::string>> refs_;
};
struct ReferenceChecker : public Ope::Visitor {
ReferenceChecker(const Grammar &grammar,
const std::vector<std::string> &params)
: grammar_(grammar), params_(params) {}
void visit(Sequence &ope) override {
for (auto op : ope.opes_) {
op->accept(*this);
}
}
void visit(PrioritizedChoice &ope) override {
for (auto op : ope.opes_) {
op->accept(*this);
}
}
void visit(Repetition &ope) override { ope.ope_->accept(*this); }
void visit(AndPredicate &ope) override { ope.ope_->accept(*this); }
void visit(NotPredicate &ope) override { ope.ope_->accept(*this); }
void visit(CaptureScope &ope) override { ope.ope_->accept(*this); }
void visit(Capture &ope) override { ope.ope_->accept(*this); }
void visit(TokenBoundary &ope) override { ope.ope_->accept(*this); }
void visit(Ignore &ope) override { ope.ope_->accept(*this); }
void visit(WeakHolder &ope) override { ope.weak_.lock()->accept(*this); }
void visit(Holder &ope) override { ope.ope_->accept(*this); }
void visit(Reference &ope) override;
void visit(Whitespace &ope) override { ope.ope_->accept(*this); }
void visit(PrecedenceClimbing &ope) override { ope.atom_->accept(*this); }
void visit(Recovery &ope) override { ope.ope_->accept(*this); }
std::unordered_map<std::string, const char *> error_s;
std::unordered_map<std::string, std::string> error_message;
private:
const Grammar &grammar_;
const std::vector<std::string> &params_;
};
struct LinkReferences : public Ope::Visitor {
LinkReferences(Grammar &grammar, const std::vector<std::string> &params)
: grammar_(grammar), params_(params) {}
void visit(Sequence &ope) override {
for (auto op : ope.opes_) {
op->accept(*this);
}
}
void visit(PrioritizedChoice &ope) override {
for (auto op : ope.opes_) {
op->accept(*this);
}
}
void visit(Repetition &ope) override { ope.ope_->accept(*this); }
void visit(AndPredicate &ope) override { ope.ope_->accept(*this); }
void visit(NotPredicate &ope) override { ope.ope_->accept(*this); }
void visit(CaptureScope &ope) override { ope.ope_->accept(*this); }
void visit(Capture &ope) override { ope.ope_->accept(*this); }
void visit(TokenBoundary &ope) override { ope.ope_->accept(*this); }
void visit(Ignore &ope) override { ope.ope_->accept(*this); }
void visit(WeakHolder &ope) override { ope.weak_.lock()->accept(*this); }
void visit(Holder &ope) override { ope.ope_->accept(*this); }
void visit(Reference &ope) override;
void visit(Whitespace &ope) override { ope.ope_->accept(*this); }
void visit(PrecedenceClimbing &ope) override { ope.atom_->accept(*this); }
void visit(Recovery &ope) override { ope.ope_->accept(*this); }
private:
Grammar &grammar_;
const std::vector<std::string> &params_;
};
struct FindReference : public Ope::Visitor {
FindReference(const std::vector<std::shared_ptr<Ope>> &args,
const std::vector<std::string> &params)
: args_(args), params_(params) {}
void visit(Sequence &ope) override {
std::vector<std::shared_ptr<Ope>> opes;
for (auto o : ope.opes_) {
o->accept(*this);
opes.push_back(found_ope);
}
found_ope = std::make_shared<Sequence>(opes);
}
void visit(PrioritizedChoice &ope) override {
std::vector<std::shared_ptr<Ope>> opes;
for (auto o : ope.opes_) {
o->accept(*this);
opes.push_back(found_ope);
}
found_ope = std::make_shared<PrioritizedChoice>(opes);
}
void visit(Repetition &ope) override {
ope.ope_->accept(*this);
found_ope = rep(found_ope, ope.min_, ope.max_);
}
void visit(AndPredicate &ope) override {
ope.ope_->accept(*this);
found_ope = apd(found_ope);
}
void visit(NotPredicate &ope) override {
ope.ope_->accept(*this);
found_ope = npd(found_ope);
}
void visit(Dictionary &ope) override { found_ope = ope.shared_from_this(); }
void visit(LiteralString &ope) override {
found_ope = ope.shared_from_this();
}
void visit(CharacterClass &ope) override {
found_ope = ope.shared_from_this();
}
void visit(Character &ope) override { found_ope = ope.shared_from_this(); }
void visit(AnyCharacter &ope) override { found_ope = ope.shared_from_this(); }
void visit(CaptureScope &ope) override {
ope.ope_->accept(*this);
found_ope = csc(found_ope);
}
void visit(Capture &ope) override {
ope.ope_->accept(*this);
found_ope = cap(found_ope, ope.match_action_);
}
void visit(TokenBoundary &ope) override {
ope.ope_->accept(*this);
found_ope = tok(found_ope);
}
void visit(Ignore &ope) override {
ope.ope_->accept(*this);
found_ope = ign(found_ope);
}
void visit(WeakHolder &ope) override { ope.weak_.lock()->accept(*this); }
void visit(Holder &ope) override { ope.ope_->accept(*this); }
void visit(Reference &ope) override;
void visit(Whitespace &ope) override {
ope.ope_->accept(*this);
found_ope = wsp(found_ope);
}
void visit(PrecedenceClimbing &ope) override {
ope.atom_->accept(*this);
found_ope = csc(found_ope);
}
void visit(Recovery &ope) override {
ope.ope_->accept(*this);
found_ope = rec(found_ope);
}
void visit(Cut &ope) override { found_ope = ope.shared_from_this(); }
std::shared_ptr<Ope> found_ope;
private:
const std::vector<std::shared_ptr<Ope>> &args_;
const std::vector<std::string> &params_;
};
struct IsPrioritizedChoice : public Ope::Visitor {
void visit(PrioritizedChoice &) override { result_ = true; }
static bool check(Ope &ope) {
IsPrioritizedChoice vis;
ope.accept(vis);
return vis.result_;
}
private:
bool result_ = false;
};
/*
* Keywords
*/
static const char *WHITESPACE_DEFINITION_NAME = "%whitespace";
static const char *WORD_DEFINITION_NAME = "%word";
static const char *RECOVER_DEFINITION_NAME = "%recover";
/*
* Definition
*/
class Definition {
public:
struct Result {
bool ret;
bool recovered;
size_t len;
ErrorInfo error_info;
};
Definition() : holder_(std::make_shared<Holder>(this)) {}
Definition(const Definition &rhs) : name(rhs.name), holder_(rhs.holder_) {
holder_->outer_ = this;
}
Definition(const std::shared_ptr<Ope> &ope)
: holder_(std::make_shared<Holder>(this)) {
*this <= ope;
}
operator std::shared_ptr<Ope>() {
return std::make_shared<WeakHolder>(holder_);
}
Definition &operator<=(const std::shared_ptr<Ope> &ope) {
holder_->ope_ = ope;
return *this;
}
Result parse(const char *s, size_t n, const char *path = nullptr,
Log log = nullptr) const {
SemanticValues vs;
std::any dt;
return parse_core(s, n, vs, dt, path, log);
}
Result parse(const char *s, const char *path = nullptr,
Log log = nullptr) const {
auto n = strlen(s);
return parse(s, n, path, log);
}
Result parse(const char *s, size_t n, std::any &dt,
const char *path = nullptr, Log log = nullptr) const {
SemanticValues vs;
return parse_core(s, n, vs, dt, path, log);
}
Result parse(const char *s, std::any &dt, const char *path = nullptr,
Log log = nullptr) const {
auto n = strlen(s);
return parse(s, n, dt, path, log);
}
template <typename T>
Result parse_and_get_value(const char *s, size_t n, T &val,
const char *path = nullptr,
Log log = nullptr) const {
SemanticValues vs;
std::any dt;
auto r = parse_core(s, n, vs, dt, path, log);
if (r.ret && !vs.empty() && vs.front().has_value()) {
val = std::any_cast<T>(vs[0]);
}
return r;
}
template <typename T>
Result parse_and_get_value(const char *s, T &val, const char *path = nullptr,
Log log = nullptr) const {
auto n = strlen(s);
return parse_and_get_value(s, n, val, path, log);
}
template <typename T>
Result parse_and_get_value(const char *s, size_t n, std::any &dt, T &val,
const char *path = nullptr,
Log log = nullptr) const {
SemanticValues vs;
auto r = parse_core(s, n, vs, dt, path, log);
if (r.ret && !vs.empty() && vs.front().has_value()) {
val = std::any_cast<T>(vs[0]);
}
return r;
}
template <typename T>
Result parse_and_get_value(const char *s, std::any &dt, T &val,
const char *path = nullptr,
Log log = nullptr) const {
auto n = strlen(s);
return parse_and_get_value(s, n, dt, val, path, log);
}
void operator=(Action a) { action = a; }
template <typename T> Definition &operator,(T fn) {
operator=(fn);
return *this;
}
Definition &operator~() {
ignoreSemanticValue = true;
return *this;
}
void accept(Ope::Visitor &v) { holder_->accept(v); }
std::shared_ptr<Ope> get_core_operator() const { return holder_->ope_; }
bool is_token() const {
std::call_once(is_token_init_, [this]() {
is_token_ = TokenChecker::is_token(*get_core_operator());
});
return is_token_;
}
std::string name;
const char *s_ = nullptr;
size_t id = 0;
Action action;
std::function<void(const char *s, size_t n, std::any &dt)> enter;
std::function<void(const char *s, size_t n, size_t matchlen, std::any &value,
std::any &dt)>
leave;
bool ignoreSemanticValue = false;
std::shared_ptr<Ope> whitespaceOpe;
std::shared_ptr<Ope> wordOpe;
bool enablePackratParsing = false;
bool is_macro = false;
std::vector<std::string> params;
TracerEnter tracer_enter;
TracerLeave tracer_leave;
bool disable_action = false;
std::string error_message;
bool no_ast_opt = false;
private:
friend class Reference;
friend class ParserGenerator;
Definition &operator=(const Definition &rhs);
Definition &operator=(Definition &&rhs);
void initialize_definition_ids() const {
std::call_once(definition_ids_init_, [&]() {
AssignIDToDefinition vis;
holder_->accept(vis);
if (whitespaceOpe) { whitespaceOpe->accept(vis); }
if (wordOpe) { wordOpe->accept(vis); }
definition_ids_.swap(vis.ids);
});
}
Result parse_core(const char *s, size_t n, SemanticValues &vs, std::any &dt,
const char *path, Log log) const {
initialize_definition_ids();
std::shared_ptr<Ope> ope = holder_;
if (whitespaceOpe) { ope = std::make_shared<Sequence>(whitespaceOpe, ope); }
Context cxt(path, s, n, definition_ids_.size(), whitespaceOpe, wordOpe,
enablePackratParsing, tracer_enter, tracer_leave, log);
auto len = ope->parse(s, n, vs, cxt, dt);
return Result{success(len), cxt.recovered, len, cxt.error_info};
}
std::shared_ptr<Holder> holder_;
mutable std::once_flag is_token_init_;
mutable bool is_token_ = false;
mutable std::once_flag assign_id_to_definition_init_;
mutable std::once_flag definition_ids_init_;
mutable std::unordered_map<void *, size_t> definition_ids_;
};
/*
* Implementations
*/
inline size_t parse_literal(const char *s, size_t n, SemanticValues &vs,
Context &c, std::any &dt, const std::string &lit,
std::once_flag &init_is_word, bool &is_word,
bool ignore_case) {
size_t i = 0;
for (; i < lit.size(); i++) {
if (i >= n || (ignore_case ? (std::tolower(s[i]) != std::tolower(lit[i]))
: (s[i] != lit[i]))) {
c.set_error_pos(s, lit.c_str());
return static_cast<size_t>(-1);
}
}
// Word check
SemanticValues dummy_vs;
Context dummy_c(nullptr, c.s, c.l, 0, nullptr, nullptr, false, nullptr,
nullptr, nullptr);
std::any dummy_dt;
std::call_once(init_is_word, [&]() {
if (c.wordOpe) {
auto len =
c.wordOpe->parse(lit.data(), lit.size(), dummy_vs, dummy_c, dummy_dt);
is_word = success(len);
}
});
if (is_word) {
NotPredicate ope(c.wordOpe);
auto len = ope.parse(s + i, n - i, dummy_vs, dummy_c, dummy_dt);
if (fail(len)) { return len; }
i += len;
}
// Skip whiltespace
if (!c.in_token_boundary_count) {
if (c.whitespaceOpe) {
auto len = c.whitespaceOpe->parse(s + i, n - i, vs, c, dt);
if (fail(len)) { return len; }
i += len;
}
}
return i;
}
inline void Context::set_error_pos(const char *a_s, const char *literal) {
if (log) {
if (error_info.error_pos <= a_s) {
if (error_info.error_pos < a_s) {
error_info.error_pos = a_s;
error_info.expected_tokens.clear();
}
if (literal) {
error_info.add(literal, true);
} else if (!rule_stack.empty()) {
auto rule = rule_stack.back();
auto ope = rule->get_core_operator();
if (auto token = FindLiteralToken::token(*ope);
token && token[0] != '\0') {
error_info.add(token, true);
} else {
error_info.add(rule->name.c_str(), false);
}
}
}
}
}
inline void Context::trace_enter(const Ope &ope, const char *a_s, size_t n,
SemanticValues &vs, std::any &dt) const {
trace_ids.push_back(next_trace_id++);
tracer_enter(ope, a_s, n, vs, *this, dt);
}
inline void Context::trace_leave(const Ope &ope, const char *a_s, size_t n,
SemanticValues &vs, std::any &dt,
size_t len) const {
tracer_leave(ope, a_s, n, vs, *this, dt, len);
trace_ids.pop_back();
}
inline bool Context::is_traceable(const Ope &ope) const {
if (tracer_enter && tracer_leave) {
return !IsReference::check(const_cast<Ope &>(ope));
}
return false;
}
inline size_t Ope::parse(const char *s, size_t n, SemanticValues &vs,
Context &c, std::any &dt) const {
if (c.is_traceable(*this)) {
c.trace_enter(*this, s, n, vs, dt);
auto len = parse_core(s, n, vs, c, dt);
c.trace_leave(*this, s, n, vs, dt, len);
return len;
}
return parse_core(s, n, vs, c, dt);
}
inline size_t Dictionary::parse_core(const char *s, size_t n,
SemanticValues & /*vs*/, Context &c,
std::any & /*dt*/) const {
auto len = trie_.match(s, n);
if (len > 0) { return len; }
c.set_error_pos(s);
return static_cast<size_t>(-1);
}
inline size_t LiteralString::parse_core(const char *s, size_t n,
SemanticValues &vs, Context &c,
std::any &dt) const {
return parse_literal(s, n, vs, c, dt, lit_, init_is_word_, is_word_,
ignore_case_);
}
inline size_t TokenBoundary::parse_core(const char *s, size_t n,
SemanticValues &vs, Context &c,
std::any &dt) const {
size_t len;
{
c.in_token_boundary_count++;
auto se = scope_exit([&]() { c.in_token_boundary_count--; });
len = ope_->parse(s, n, vs, c, dt);
}
if (success(len)) {
vs.tokens.emplace_back(std::string_view(s, len));
if (!c.in_token_boundary_count) {
if (c.whitespaceOpe) {
auto l = c.whitespaceOpe->parse(s + len, n - len, vs, c, dt);
if (fail(l)) { return l; }
len += l;
}
}
}
return len;
}
inline size_t Holder::parse_core(const char *s, size_t n, SemanticValues &vs,
Context &c, std::any &dt) const {
if (!ope_) {
throw std::logic_error("Uninitialized definition ope was used...");
}
// Macro reference
if (outer_->is_macro) {
c.rule_stack.push_back(outer_);
auto len = ope_->parse(s, n, vs, c, dt);
c.rule_stack.pop_back();
return len;
}
size_t len;
std::any val;
c.packrat(s, outer_->id, len, val, [&](std::any &a_val) {
if (outer_->enter) { outer_->enter(s, n, dt); }
auto se2 = scope_exit([&]() {
c.pop();
if (outer_->leave) { outer_->leave(s, n, len, a_val, dt); }
});
auto &chldsv = c.push();
c.rule_stack.push_back(outer_);
len = ope_->parse(s, n, chldsv, c, dt);
c.rule_stack.pop_back();
// Invoke action
if (success(len)) {
chldsv.sv_ = std::string_view(s, len);
chldsv.name_ = outer_->name;
if (!IsPrioritizedChoice::check(*ope_)) {
chldsv.choice_count_ = 0;
chldsv.choice_ = 0;
}
try {
a_val = reduce(chldsv, dt);
} catch (const parse_error &e) {
if (c.log) {
if (e.what()) {
if (c.error_info.message_pos < s) {
c.error_info.message_pos = s;
c.error_info.message = e.what();
}
}
}
len = static_cast<size_t>(-1);
}
}
});
if (success(len)) {
if (!outer_->ignoreSemanticValue) {
vs.emplace_back(std::move(val));
vs.tags.emplace_back(str2tag(outer_->name));
}
}
return len;
}
inline std::any Holder::reduce(SemanticValues &vs, std::any &dt) const {
if (outer_->action && !outer_->disable_action) {
return outer_->action(vs, dt);
} else if (vs.empty()) {
return std::any();
} else {
return std::move(vs.front());
}
}
inline const char *Holder::trace_name() const {
if (trace_name_.empty()) { trace_name_ = "[" + outer_->name + "]"; }
return trace_name_.data();
}
inline size_t Reference::parse_core(const char *s, size_t n, SemanticValues &vs,
Context &c, std::any &dt) const {
if (rule_) {
// Reference rule
if (rule_->is_macro) {
// Macro
FindReference vis(c.top_args(), c.rule_stack.back()->params);
// Collect arguments
std::vector<std::shared_ptr<Ope>> args;
for (auto arg : args_) {
arg->accept(vis);
args.emplace_back(std::move(vis.found_ope));
}
c.push_args(std::move(args));
auto se = scope_exit([&]() { c.pop_args(); });
auto ope = get_core_operator();
return ope->parse(s, n, vs, c, dt);
} else {
// Definition
c.push_args(std::vector<std::shared_ptr<Ope>>());
auto se = scope_exit([&]() { c.pop_args(); });
auto ope = get_core_operator();
return ope->parse(s, n, vs, c, dt);
}
} else {
// Reference parameter in macro
const auto &args = c.top_args();
return args[iarg_]->parse(s, n, vs, c, dt);
}
}
inline std::shared_ptr<Ope> Reference::get_core_operator() const {
return rule_->holder_;
}
inline size_t BackReference::parse_core(const char *s, size_t n,
SemanticValues &vs, Context &c,
std::any &dt) const {
auto size = static_cast<int>(c.capture_scope_stack_size);
for (auto i = size - 1; i >= 0; i--) {
auto index = static_cast<size_t>(i);
const auto &cs = c.capture_scope_stack[index];
if (cs.find(name_) != cs.end()) {
const auto &lit = cs.at(name_);
std::once_flag init_is_word;
auto is_word = false;
return parse_literal(s, n, vs, c, dt, lit, init_is_word, is_word, false);
}
}
throw std::runtime_error("Invalid back reference...");
}
inline Definition &
PrecedenceClimbing::get_reference_for_binop(Context &c) const {
if (rule_.is_macro) {
// Reference parameter in macro
const auto &args = c.top_args();
auto iarg = dynamic_cast<Reference &>(*binop_).iarg_;
auto arg = args[iarg];
return *dynamic_cast<Reference &>(*arg).rule_;
}
return *dynamic_cast<Reference &>(*binop_).rule_;
}
inline size_t PrecedenceClimbing::parse_expression(const char *s, size_t n,
SemanticValues &vs,
Context &c, std::any &dt,
size_t min_prec) const {
auto len = atom_->parse(s, n, vs, c, dt);
if (fail(len)) { return len; }
std::string tok;
auto &rule = get_reference_for_binop(c);
auto action = std::move(rule.action);
rule.action = [&](SemanticValues &vs2, std::any &dt2) {
tok = vs2.token();
if (action) {
return action(vs2, dt2);
} else if (!vs2.empty()) {
return vs2[0];
}
return std::any();
};
auto action_se = scope_exit([&]() { rule.action = std::move(action); });
auto i = len;
while (i < n) {
std::vector<std::any> save_values(vs.begin(), vs.end());
auto save_tokens = vs.tokens;
auto chv = c.push();
auto chl = binop_->parse(s + i, n - i, chv, c, dt);
c.pop();
if (fail(chl)) { break; }
auto it = info_.find(tok);
if (it == info_.end()) { break; }
auto level = std::get<0>(it->second);
auto assoc = std::get<1>(it->second);
if (level < min_prec) { break; }
vs.emplace_back(std::move(chv[0]));
i += chl;
auto next_min_prec = level;
if (assoc == 'L') { next_min_prec = level + 1; }
chv = c.push();
chl = parse_expression(s + i, n - i, chv, c, dt, next_min_prec);
c.pop();
if (fail(chl)) {
vs.assign(save_values.begin(), save_values.end());
vs.tokens = save_tokens;
break;
}
vs.emplace_back(std::move(chv[0]));
i += chl;
std::any val;
if (rule_.action) {
vs.sv_ = std::string_view(s, i);
val = rule_.action(vs, dt);
} else if (!vs.empty()) {
val = vs[0];
}
vs.clear();
vs.emplace_back(std::move(val));
}
return i;
}
inline size_t Recovery::parse_core(const char *s, size_t n,
SemanticValues & /*vs*/, Context &c,
std::any & /*dt*/) const {
const auto &rule = dynamic_cast<Reference &>(*ope_);
// Custom error message
if (c.log) {
auto label = dynamic_cast<Reference *>(rule.args_[0].get());
if (label) {
if (!label->rule_->error_message.empty()) {
c.error_info.message_pos = s;
c.error_info.message = label->rule_->error_message;
}
}
}
// Recovery
size_t len = static_cast<size_t>(-1);
{
auto save_log = c.log;
c.log = nullptr;
auto se = scope_exit([&]() { c.log = save_log; });
SemanticValues dummy_vs;
std::any dummy_dt;
len = rule.parse(s, n, dummy_vs, c, dummy_dt);
}
if (success(len)) {
c.recovered = true;
if (c.log) {
c.error_info.output_log(c.log, c.s, c.l);
c.error_info.clear();
}
}
// Cut
if (!c.cut_stack.empty()) {
c.cut_stack.back() = true;
if (c.cut_stack.size() == 1) {
// TODO: Remove unneeded entries in packrat memoise table
}
}
return len;
}
inline void Sequence::accept(Visitor &v) { v.visit(*this); }
inline void PrioritizedChoice::accept(Visitor &v) { v.visit(*this); }
inline void Repetition::accept(Visitor &v) { v.visit(*this); }
inline void AndPredicate::accept(Visitor &v) { v.visit(*this); }
inline void NotPredicate::accept(Visitor &v) { v.visit(*this); }
inline void Dictionary::accept(Visitor &v) { v.visit(*this); }
inline void LiteralString::accept(Visitor &v) { v.visit(*this); }
inline void CharacterClass::accept(Visitor &v) { v.visit(*this); }
inline void Character::accept(Visitor &v) { v.visit(*this); }
inline void AnyCharacter::accept(Visitor &v) { v.visit(*this); }
inline void CaptureScope::accept(Visitor &v) { v.visit(*this); }
inline void Capture::accept(Visitor &v) { v.visit(*this); }
inline void TokenBoundary::accept(Visitor &v) { v.visit(*this); }
inline void Ignore::accept(Visitor &v) { v.visit(*this); }
inline void User::accept(Visitor &v) { v.visit(*this); }
inline void WeakHolder::accept(Visitor &v) { v.visit(*this); }
inline void Holder::accept(Visitor &v) { v.visit(*this); }
inline void Reference::accept(Visitor &v) { v.visit(*this); }
inline void Whitespace::accept(Visitor &v) { v.visit(*this); }
inline void BackReference::accept(Visitor &v) { v.visit(*this); }
inline void PrecedenceClimbing::accept(Visitor &v) { v.visit(*this); }
inline void Recovery::accept(Visitor &v) { v.visit(*this); }
inline void Cut::accept(Visitor &v) { v.visit(*this); }
inline void AssignIDToDefinition::visit(Holder &ope) {
auto p = static_cast<void *>(ope.outer_);
if (ids.count(p)) { return; }
auto id = ids.size();
ids[p] = id;
ope.outer_->id = id;
ope.ope_->accept(*this);
}
inline void AssignIDToDefinition::visit(Reference &ope) {
if (ope.rule_) {
for (auto arg : ope.args_) {
arg->accept(*this);
}
ope.rule_->accept(*this);
}
}
inline void AssignIDToDefinition::visit(PrecedenceClimbing &ope) {
ope.atom_->accept(*this);
ope.binop_->accept(*this);
}
inline void TokenChecker::visit(Reference &ope) {
if (ope.is_macro_) {
for (auto arg : ope.args_) {
arg->accept(*this);
}
} else {
has_rule_ = true;
}
}
inline void FindLiteralToken::visit(Reference &ope) {
if (ope.is_macro_) {
ope.rule_->accept(*this);
for (auto arg : ope.args_) {
arg->accept(*this);
}
}
}
inline void DetectLeftRecursion::visit(Reference &ope) {
if (ope.name_ == name_) {
error_s = ope.s_;
} else if (!refs_.count(ope.name_)) {
refs_.insert(ope.name_);
if (ope.rule_) {
ope.rule_->accept(*this);
if (done_ == false) { return; }
}
}
done_ = true;
}
inline void HasEmptyElement::visit(Reference &ope) {
auto it = std::find_if(refs_.begin(), refs_.end(),
[&](const std::pair<const char *, std::string> &ref) {
return ope.name_ == ref.second;
});
if (it != refs_.end()) { return; }
if (ope.rule_) {
refs_.emplace_back(ope.s_, ope.name_);
ope.rule_->accept(*this);
refs_.pop_back();
}
}
inline void DetectInfiniteLoop::visit(Reference &ope) {
auto it = std::find_if(refs_.begin(), refs_.end(),
[&](const std::pair<const char *, std::string> &ref) {
return ope.name_ == ref.second;
});
if (it != refs_.end()) { return; }
if (ope.rule_) {
refs_.emplace_back(ope.s_, ope.name_);
ope.rule_->accept(*this);
refs_.pop_back();
}
}
inline void ReferenceChecker::visit(Reference &ope) {
auto it = std::find(params_.begin(), params_.end(), ope.name_);
if (it != params_.end()) { return; }
if (!grammar_.count(ope.name_)) {
error_s[ope.name_] = ope.s_;
error_message[ope.name_] = "'" + ope.name_ + "' is not defined.";
} else {
const auto &rule = grammar_.at(ope.name_);
if (rule.is_macro) {
if (!ope.is_macro_ || ope.args_.size() != rule.params.size()) {
error_s[ope.name_] = ope.s_;
error_message[ope.name_] = "incorrect number of arguments.";
}
} else if (ope.is_macro_) {
error_s[ope.name_] = ope.s_;
error_message[ope.name_] = "'" + ope.name_ + "' is not macro.";
}
for (auto arg : ope.args_) {
arg->accept(*this);
}
}
}
inline void LinkReferences::visit(Reference &ope) {
// Check if the reference is a macro parameter
auto found_param = false;
for (size_t i = 0; i < params_.size(); i++) {
const auto &param = params_[i];
if (param == ope.name_) {
ope.iarg_ = i;
found_param = true;
break;
}
}
// Check if the reference is a definition rule
if (!found_param && grammar_.count(ope.name_)) {
auto &rule = grammar_.at(ope.name_);
ope.rule_ = &rule;
}
for (auto arg : ope.args_) {
arg->accept(*this);
}
}
inline void FindReference::visit(Reference &ope) {
for (size_t i = 0; i < args_.size(); i++) {
const auto &name = params_[i];
if (name == ope.name_) {
found_ope = args_[i];
return;
}
}
found_ope = ope.shared_from_this();
}
/*-----------------------------------------------------------------------------
* PEG parser generator
*---------------------------------------------------------------------------*/
using Rules = std::unordered_map<std::string, std::shared_ptr<Ope>>;
class ParserGenerator {
public:
static std::shared_ptr<Grammar> parse(const char *s, size_t n,
const Rules &rules, std::string &start,
Log log) {
return get_instance().perform_core(s, n, rules, start, log);
}
static std::shared_ptr<Grammar> parse(const char *s, size_t n,
std::string &start, Log log) {
Rules dummy;
return parse(s, n, dummy, start, log);
}
// For debuging purpose
static Grammar &grammar() { return get_instance().g; }
private:
static ParserGenerator &get_instance() {
static ParserGenerator instance;
return instance;
}
ParserGenerator() {
make_grammar();
setup_actions();
}
struct Instruction {
std::string type;
std::any data;
};
struct Data {
std::shared_ptr<Grammar> grammar;
std::string start;
const char *start_pos = nullptr;
std::vector<std::pair<std::string, const char *>> duplicates;
std::map<std::string, Instruction> instructions;
Data() : grammar(std::make_shared<Grammar>()) {}
};
void make_grammar() {
// Setup PEG syntax parser
g["Grammar"] <= seq(g["Spacing"], oom(g["Definition"]), g["EndOfFile"]);
g["Definition"] <=
cho(seq(g["Ignore"], g["IdentCont"], g["Parameters"], g["LEFTARROW"],
g["Expression"], opt(g["Instruction"])),
seq(g["Ignore"], g["Identifier"], g["LEFTARROW"], g["Expression"],
opt(g["Instruction"])));
g["Expression"] <= seq(g["Sequence"], zom(seq(g["SLASH"], g["Sequence"])));
g["Sequence"] <= zom(cho(g["CUT"], g["Prefix"]));
g["Prefix"] <= seq(opt(cho(g["AND"], g["NOT"])), g["SuffixWithLabel"]);
g["SuffixWithLabel"] <=
seq(g["Suffix"], opt(seq(g["LABEL"], g["Identifier"])));
g["Suffix"] <= seq(g["Primary"], opt(g["Loop"]));
g["Loop"] <= cho(g["QUESTION"], g["STAR"], g["PLUS"], g["Repetition"]);
g["Primary"] <=
cho(seq(g["Ignore"], g["IdentCont"], g["Arguments"],
npd(g["LEFTARROW"])),
seq(g["Ignore"], g["Identifier"],
npd(seq(opt(g["Parameters"]), g["LEFTARROW"]))),
seq(g["OPEN"], g["Expression"], g["CLOSE"]),
seq(g["BeginTok"], g["Expression"], g["EndTok"]),
seq(g["BeginCapScope"], g["Expression"], g["EndCapScope"]),
seq(g["BeginCap"], g["Expression"], g["EndCap"]), g["BackRef"],
g["LiteralI"], g["Dictionary"], g["Literal"], g["NegatedClass"],
g["Class"], g["DOT"]);
g["Identifier"] <= seq(g["IdentCont"], g["Spacing"]);
g["IdentCont"] <= seq(g["IdentStart"], zom(g["IdentRest"]));
const static std::vector<std::pair<char32_t, char32_t>> range = {
{0x0080, 0xFFFF}};
g["IdentStart"] <= seq(npd(lit(u8(u8"↑"))), npd(lit(u8(u8"⇑"))),
cho(cls("a-zA-Z_%"), cls(range)));
g["IdentRest"] <= cho(g["IdentStart"], cls("0-9"));
g["Dictionary"] <= seq(g["LiteralD"], oom(seq(g["PIPE"], g["LiteralD"])));
auto lit_ope = cho(seq(cls("'"), tok(zom(seq(npd(cls("'")), g["Char"]))),
cls("'"), g["Spacing"]),
seq(cls("\""), tok(zom(seq(npd(cls("\"")), g["Char"]))),
cls("\""), g["Spacing"]));
g["Literal"] <= lit_ope;
g["LiteralD"] <= lit_ope;
g["LiteralI"] <=
cho(seq(cls("'"), tok(zom(seq(npd(cls("'")), g["Char"]))), lit("'i"),
g["Spacing"]),
seq(cls("\""), tok(zom(seq(npd(cls("\"")), g["Char"]))), lit("\"i"),
g["Spacing"]));
// NOTE: The original Brian Ford's paper uses 'zom' instead of 'oom'.
g["Class"] <= seq(chr('['), npd(chr('^')),
tok(oom(seq(npd(chr(']')), g["Range"]))), chr(']'),
g["Spacing"]);
g["NegatedClass"] <= seq(lit("[^"),
tok(oom(seq(npd(chr(']')), g["Range"]))), chr(']'),
g["Spacing"]);
g["Range"] <= cho(seq(g["Char"], chr('-'), g["Char"]), g["Char"]);
g["Char"] <=
cho(seq(chr('\\'), cls("nrt'\"[]\\^")),
seq(chr('\\'), cls("0-3"), cls("0-7"), cls("0-7")),
seq(chr('\\'), cls("0-7"), opt(cls("0-7"))),
seq(lit("\\x"), cls("0-9a-fA-F"), opt(cls("0-9a-fA-F"))),
seq(lit("\\u"),
cho(seq(cho(seq(chr('0'), cls("0-9a-fA-F")), lit("10")),
rep(cls("0-9a-fA-F"), 4, 4)),
rep(cls("0-9a-fA-F"), 4, 5))),
seq(npd(chr('\\')), dot()));
g["Repetition"] <=
seq(g["BeginBlacket"], g["RepetitionRange"], g["EndBlacket"]);
g["RepetitionRange"] <= cho(seq(g["Number"], g["COMMA"], g["Number"]),
seq(g["Number"], g["COMMA"]), g["Number"],
seq(g["COMMA"], g["Number"]));
g["Number"] <= seq(oom(cls("0-9")), g["Spacing"]);
g["LEFTARROW"] <= seq(cho(lit("<-"), lit(u8(u8"←"))), g["Spacing"]);
~g["SLASH"] <= seq(chr('/'), g["Spacing"]);
~g["PIPE"] <= seq(chr('|'), g["Spacing"]);
g["AND"] <= seq(chr('&'), g["Spacing"]);
g["NOT"] <= seq(chr('!'), g["Spacing"]);
g["QUESTION"] <= seq(chr('?'), g["Spacing"]);
g["STAR"] <= seq(chr('*'), g["Spacing"]);
g["PLUS"] <= seq(chr('+'), g["Spacing"]);
~g["OPEN"] <= seq(chr('('), g["Spacing"]);
~g["CLOSE"] <= seq(chr(')'), g["Spacing"]);
g["DOT"] <= seq(chr('.'), g["Spacing"]);
g["CUT"] <= seq(lit(u8(u8"↑")), g["Spacing"]);
~g["LABEL"] <= seq(cho(chr('^'), lit(u8(u8"⇑"))), g["Spacing"]);
~g["Spacing"] <= zom(cho(g["Space"], g["Comment"]));
g["Comment"] <=
seq(chr('#'), zom(seq(npd(g["EndOfLine"]), dot())), g["EndOfLine"]);
g["Space"] <= cho(chr(' '), chr('\t'), g["EndOfLine"]);
g["EndOfLine"] <= cho(lit("\r\n"), chr('\n'), chr('\r'));
g["EndOfFile"] <= npd(dot());
~g["BeginTok"] <= seq(chr('<'), g["Spacing"]);
~g["EndTok"] <= seq(chr('>'), g["Spacing"]);
~g["BeginCapScope"] <= seq(chr('$'), chr('('), g["Spacing"]);
~g["EndCapScope"] <= seq(chr(')'), g["Spacing"]);
g["BeginCap"] <= seq(chr('$'), tok(g["IdentCont"]), chr('<'), g["Spacing"]);
~g["EndCap"] <= seq(chr('>'), g["Spacing"]);
g["BackRef"] <= seq(chr('$'), tok(g["IdentCont"]), g["Spacing"]);
g["IGNORE"] <= chr('~');
g["Ignore"] <= opt(g["IGNORE"]);
g["Parameters"] <= seq(g["OPEN"], g["Identifier"],
zom(seq(g["COMMA"], g["Identifier"])), g["CLOSE"]);
g["Arguments"] <= seq(g["OPEN"], g["Expression"],
zom(seq(g["COMMA"], g["Expression"])), g["CLOSE"]);
~g["COMMA"] <= seq(chr(','), g["Spacing"]);
// Instruction grammars
g["Instruction"] <= seq(g["BeginBlacket"],
cho(cho(g["PrecedenceClimbing"]),
cho(g["ErrorMessage"]), cho(g["NoAstOpt"])),
g["EndBlacket"]);
~g["SpacesZom"] <= zom(g["Space"]);
~g["SpacesOom"] <= oom(g["Space"]);
~g["BeginBlacket"] <= seq(chr('{'), g["Spacing"]);
~g["EndBlacket"] <= seq(chr('}'), g["Spacing"]);
// PrecedenceClimbing instruction
g["PrecedenceClimbing"] <=
seq(lit("precedence"), g["SpacesOom"], g["PrecedenceInfo"],
zom(seq(g["SpacesOom"], g["PrecedenceInfo"])), g["SpacesZom"]);
g["PrecedenceInfo"] <=
seq(g["PrecedenceAssoc"],
oom(seq(ign(g["SpacesOom"]), g["PrecedenceOpe"])));
g["PrecedenceOpe"] <=
tok(oom(
seq(npd(cho(g["PrecedenceAssoc"], g["Space"], chr('}'))), dot())));
g["PrecedenceAssoc"] <= cls("LR");
// Error message instruction
g["ErrorMessage"] <=
seq(lit("message"), g["SpacesOom"], g["LiteralD"], g["SpacesZom"]);
// No Ast node optimazation instruction
g["NoAstOpt"] <= seq(lit("no_ast_opt"), g["SpacesZom"]);
// Set definition names
for (auto &x : g) {
x.second.name = x.first;
}
}
void setup_actions() {
g["Definition"] = [&](const SemanticValues &vs, std::any &dt) {
auto &data = *std::any_cast<Data *>(dt);
auto is_macro = vs.choice() == 0;
auto ignore = std::any_cast<bool>(vs[0]);
auto name = std::any_cast<std::string>(vs[1]);
std::vector<std::string> params;
std::shared_ptr<Ope> ope;
if (is_macro) {
params = std::any_cast<std::vector<std::string>>(vs[2]);
ope = std::any_cast<std::shared_ptr<Ope>>(vs[4]);
if (vs.size() == 6) {
data.instructions[name] = std::any_cast<Instruction>(vs[5]);
}
} else {
ope = std::any_cast<std::shared_ptr<Ope>>(vs[3]);
if (vs.size() == 5) {
data.instructions[name] = std::any_cast<Instruction>(vs[4]);
}
}
auto &grammar = *data.grammar;
if (!grammar.count(name)) {
auto &rule = grammar[name];
rule <= ope;
rule.name = name;
rule.s_ = vs.sv().data();
rule.ignoreSemanticValue = ignore;
rule.is_macro = is_macro;
rule.params = params;
if (data.start.empty()) {
data.start = name;
data.start_pos = vs.sv().data();
}
} else {
data.duplicates.emplace_back(name, vs.sv().data());
}
};
g["Expression"] = [&](const SemanticValues &vs) {
if (vs.size() == 1) {
return std::any_cast<std::shared_ptr<Ope>>(vs[0]);
} else {
std::vector<std::shared_ptr<Ope>> opes;
for (auto i = 0u; i < vs.size(); i++) {
opes.emplace_back(std::any_cast<std::shared_ptr<Ope>>(vs[i]));
}
const std::shared_ptr<Ope> ope =
std::make_shared<PrioritizedChoice>(opes);
return ope;
}
};
g["Sequence"] = [&](const SemanticValues &vs) {
if (vs.empty()) {
return npd(lit(""));
} else if (vs.size() == 1) {
return std::any_cast<std::shared_ptr<Ope>>(vs[0]);
} else {
std::vector<std::shared_ptr<Ope>> opes;
for (const auto &x : vs) {
opes.emplace_back(std::any_cast<std::shared_ptr<Ope>>(x));
}
const std::shared_ptr<Ope> ope = std::make_shared<Sequence>(opes);
return ope;
}
};
g["Prefix"] = [&](const SemanticValues &vs) {
std::shared_ptr<Ope> ope;
if (vs.size() == 1) {
ope = std::any_cast<std::shared_ptr<Ope>>(vs[0]);
} else {
assert(vs.size() == 2);
auto tok = std::any_cast<char>(vs[0]);
ope = std::any_cast<std::shared_ptr<Ope>>(vs[1]);
if (tok == '&') {
ope = apd(ope);
} else { // '!'
ope = npd(ope);
}
}
return ope;
};
g["SuffixWithLabel"] = [&](const SemanticValues &vs, std::any &dt) {
auto ope = std::any_cast<std::shared_ptr<Ope>>(vs[0]);
if (vs.size() == 1) {
return ope;
} else {
assert(vs.size() == 2);
auto &data = *std::any_cast<Data *>(dt);
const auto &ident = std::any_cast<std::string>(vs[1]);
auto label = ref(*data.grammar, ident, vs.sv().data(), false, {});
auto recovery = rec(ref(*data.grammar, RECOVER_DEFINITION_NAME,
vs.sv().data(), true, {label}));
return cho4label_(ope, recovery);
}
};
struct Loop {
enum class Type { opt = 0, zom, oom, rep };
Type type;
std::pair<size_t, size_t> range;
};
g["Suffix"] = [&](const SemanticValues &vs) {
auto ope = std::any_cast<std::shared_ptr<Ope>>(vs[0]);
if (vs.size() == 1) {
return ope;
} else {
assert(vs.size() == 2);
auto loop = std::any_cast<Loop>(vs[1]);
switch (loop.type) {
case Loop::Type::opt: return opt(ope);
case Loop::Type::zom: return zom(ope);
case Loop::Type::oom: return oom(ope);
default: // Regex-like repetition
return rep(ope, loop.range.first, loop.range.second);
}
}
};
g["Loop"] = [&](const SemanticValues &vs) {
switch (vs.choice()) {
case 0: // Option
return Loop{Loop::Type::opt, std::pair<size_t, size_t>()};
case 1: // Zero or More
return Loop{Loop::Type::zom, std::pair<size_t, size_t>()};
case 2: // One or More
return Loop{Loop::Type::oom, std::pair<size_t, size_t>()};
default: // Regex-like repetition
return Loop{Loop::Type::rep,
std::any_cast<std::pair<size_t, size_t>>(vs[0])};
}
};
g["RepetitionRange"] = [&](const SemanticValues &vs) {
switch (vs.choice()) {
case 0: { // Number COMMA Number
auto min = std::any_cast<size_t>(vs[0]);
auto max = std::any_cast<size_t>(vs[1]);
return std::pair(min, max);
}
case 1: // Number COMMA
return std::pair(std::any_cast<size_t>(vs[0]),
std::numeric_limits<size_t>::max());
case 2: { // Number
auto n = std::any_cast<size_t>(vs[0]);
return std::pair(n, n);
}
default: // COMMA Number
return std::pair(std::numeric_limits<size_t>::min(),
std::any_cast<size_t>(vs[0]));
}
};
g["Number"] = [&](const SemanticValues &vs) {
return vs.token_to_number<size_t>();
};
g["Primary"] = [&](const SemanticValues &vs, std::any &dt) {
auto &data = *std::any_cast<Data *>(dt);
switch (vs.choice()) {
case 0: // Macro Reference
case 1: { // Reference
auto is_macro = vs.choice() == 0;
auto ignore = std::any_cast<bool>(vs[0]);
const auto &ident = std::any_cast<std::string>(vs[1]);
std::vector<std::shared_ptr<Ope>> args;
if (is_macro) {
args = std::any_cast<std::vector<std::shared_ptr<Ope>>>(vs[2]);
}
auto ope = ref(*data.grammar, ident, vs.sv().data(), is_macro, args);
if (ident == RECOVER_DEFINITION_NAME) { ope = rec(ope); }
if (ignore) {
return ign(ope);
} else {
return ope;
}
}
case 2: { // (Expression)
return std::any_cast<std::shared_ptr<Ope>>(vs[0]);
}
case 3: { // TokenBoundary
return tok(std::any_cast<std::shared_ptr<Ope>>(vs[0]));
}
case 4: { // CaptureScope
return csc(std::any_cast<std::shared_ptr<Ope>>(vs[0]));
}
case 5: { // Capture
const auto &name = std::any_cast<std::string_view>(vs[0]);
auto ope = std::any_cast<std::shared_ptr<Ope>>(vs[1]);
return cap(ope, [name](const char *a_s, size_t a_n, Context &c) {
auto &cs = c.capture_scope_stack[c.capture_scope_stack_size - 1];
cs[name] = std::string(a_s, a_n);
});
}
default: {
return std::any_cast<std::shared_ptr<Ope>>(vs[0]);
}
}
};
g["IdentCont"] = [](const SemanticValues &vs) {
return std::string(vs.sv().data(), vs.sv().length());
};
g["Dictionary"] = [](const SemanticValues &vs) {
auto items = vs.transform<std::string>();
return dic(items);
};
g["Literal"] = [](const SemanticValues &vs) {
const auto &tok = vs.tokens.front();
return lit(resolve_escape_sequence(tok.data(), tok.size()));
};
g["LiteralI"] = [](const SemanticValues &vs) {
const auto &tok = vs.tokens.front();
return liti(resolve_escape_sequence(tok.data(), tok.size()));
};
g["LiteralD"] = [](const SemanticValues &vs) {
auto &tok = vs.tokens.front();
return resolve_escape_sequence(tok.data(), tok.size());
};
g["Class"] = [](const SemanticValues &vs) {
auto ranges = vs.transform<std::pair<char32_t, char32_t>>();
return cls(ranges);
};
g["NegatedClass"] = [](const SemanticValues &vs) {
auto ranges = vs.transform<std::pair<char32_t, char32_t>>();
return ncls(ranges);
};
g["Range"] = [](const SemanticValues &vs) {
switch (vs.choice()) {
case 0: {
auto s1 = std::any_cast<std::string>(vs[0]);
auto s2 = std::any_cast<std::string>(vs[1]);
auto cp1 = decode_codepoint(s1.data(), s1.length());
auto cp2 = decode_codepoint(s2.data(), s2.length());
return std::pair(cp1, cp2);
}
case 1: {
auto s = std::any_cast<std::string>(vs[0]);
auto cp = decode_codepoint(s.data(), s.length());
return std::pair(cp, cp);
}
}
return std::pair<char32_t, char32_t>(0, 0);
};
g["Char"] = [](const SemanticValues &vs) {
return resolve_escape_sequence(vs.sv().data(), vs.sv().length());
};
g["AND"] = [](const SemanticValues &vs) { return *vs.sv().data(); };
g["NOT"] = [](const SemanticValues &vs) { return *vs.sv().data(); };
g["QUESTION"] = [](const SemanticValues &vs) { return *vs.sv().data(); };
g["STAR"] = [](const SemanticValues &vs) { return *vs.sv().data(); };
g["PLUS"] = [](const SemanticValues &vs) { return *vs.sv().data(); };
g["DOT"] = [](const SemanticValues & /*vs*/) { return dot(); };
g["CUT"] = [](const SemanticValues & /*vs*/) { return cut(); };
g["BeginCap"] = [](const SemanticValues &vs) { return vs.token(); };
g["BackRef"] = [&](const SemanticValues &vs) {
return bkr(vs.token_to_string());
};
g["Ignore"] = [](const SemanticValues &vs) { return vs.size() > 0; };
g["Parameters"] = [](const SemanticValues &vs) {
return vs.transform<std::string>();
};
g["Arguments"] = [](const SemanticValues &vs) {
return vs.transform<std::shared_ptr<Ope>>();
};
g["PrecedenceClimbing"] = [](const SemanticValues &vs) {
PrecedenceClimbing::BinOpeInfo binOpeInfo;
size_t level = 1;
for (auto v : vs) {
auto tokens = std::any_cast<std::vector<std::string_view>>(v);
auto assoc = tokens[0][0];
for (size_t i = 1; i < tokens.size(); i++) {
binOpeInfo[tokens[i]] = std::pair(level, assoc);
}
level++;
}
Instruction instruction;
instruction.type = "precedence";
instruction.data = binOpeInfo;
return instruction;
};
g["PrecedenceInfo"] = [](const SemanticValues &vs) {
return vs.transform<std::string_view>();
};
g["PrecedenceOpe"] = [](const SemanticValues &vs) { return vs.token(); };
g["PrecedenceAssoc"] = [](const SemanticValues &vs) { return vs.token(); };
g["ErrorMessage"] = [](const SemanticValues &vs) {
Instruction instruction;
instruction.type = "message";
instruction.data = std::any_cast<std::string>(vs[0]);
return instruction;
};
g["NoAstOpt"] = [](const SemanticValues & /*vs*/) {
Instruction instruction;
instruction.type = "no_ast_opt";
return instruction;
};
}
bool apply_precedence_instruction(Definition &rule,
const PrecedenceClimbing::BinOpeInfo &info,
const char *s, Log log) {
try {
auto &seq = dynamic_cast<Sequence &>(*rule.get_core_operator());
auto atom = seq.opes_[0];
auto &rep = dynamic_cast<Repetition &>(*seq.opes_[1]);
auto &seq1 = dynamic_cast<Sequence &>(*rep.ope_);
auto binop = seq1.opes_[0];
auto atom1 = seq1.opes_[1];
auto atom_name = dynamic_cast<Reference &>(*atom).name_;
auto binop_name = dynamic_cast<Reference &>(*binop).name_;
auto atom1_name = dynamic_cast<Reference &>(*atom1).name_;
if (!rep.is_zom() || atom_name != atom1_name || atom_name == binop_name) {
if (log) {
auto line = line_info(s, rule.s_);
log(line.first, line.second,
"'precedence' instruction cannot be applied to '" + rule.name +
"'.");
}
return false;
}
rule.holder_->ope_ = pre(atom, binop, info, rule);
rule.disable_action = true;
} catch (...) {
if (log) {
auto line = line_info(s, rule.s_);
log(line.first, line.second,
"'precedence' instruction cannot be applied to '" + rule.name +
"'.");
}
return false;
}
return true;
}
std::shared_ptr<Grammar> perform_core(const char *s, size_t n,
const Rules &rules, std::string &start,
Log log) {
Data data;
auto &grammar = *data.grammar;
// Built-in macros
{
// `%recover`
{
auto &rule = grammar[RECOVER_DEFINITION_NAME];
rule <= ref(grammar, "x", "", false, {});
rule.name = RECOVER_DEFINITION_NAME;
rule.s_ = "[native]";
rule.ignoreSemanticValue = true;
rule.is_macro = true;
rule.params = {"x"};
}
}
std::any dt = &data;
auto r = g["Grammar"].parse(s, n, dt, nullptr, log);
if (!r.ret) {
if (log) {
if (r.error_info.message_pos) {
auto line = line_info(s, r.error_info.message_pos);
log(line.first, line.second, r.error_info.message);
} else {
auto line = line_info(s, r.error_info.error_pos);
log(line.first, line.second, "syntax error");
}
}
return nullptr;
}
// User provided rules
for (const auto &x : rules) {
auto name = x.first;
auto ignore = false;
if (!name.empty() && name[0] == '~') {
ignore = true;
name.erase(0, 1);
}
if (!name.empty()) {
auto &rule = grammar[name];
rule <= x.second;
rule.name = name;
rule.ignoreSemanticValue = ignore;
}
}
// Check duplicated definitions
auto ret = data.duplicates.empty();
for (const auto &x : data.duplicates) {
if (log) {
const auto &name = x.first;
auto ptr = x.second;
auto line = line_info(s, ptr);
log(line.first, line.second, "'" + name + "' is already defined.");
}
}
// Check if the start rule has ignore operator
{
auto &rule = grammar[data.start];
if (rule.ignoreSemanticValue) {
if (log) {
auto line = line_info(s, rule.s_);
log(line.first, line.second,
"Ignore operator cannot be applied to '" + rule.name + "'.");
}
ret = false;
}
}
if (!ret) { return nullptr; }
// Check missing definitions
for (auto &x : grammar) {
auto &rule = x.second;
ReferenceChecker vis(grammar, rule.params);
rule.accept(vis);
for (const auto &y : vis.error_s) {
const auto &name = y.first;
const auto ptr = y.second;
if (log) {
auto line = line_info(s, ptr);
log(line.first, line.second, vis.error_message[name]);
}
ret = false;
}
}
if (!ret) { return nullptr; }
// Link references
for (auto &x : grammar) {
auto &rule = x.second;
LinkReferences vis(grammar, rule.params);
rule.accept(vis);
}
// Check left recursion
ret = true;
for (auto &x : grammar) {
const auto &name = x.first;
auto &rule = x.second;
DetectLeftRecursion vis(name);
rule.accept(vis);
if (vis.error_s) {
if (log) {
auto line = line_info(s, vis.error_s);
log(line.first, line.second, "'" + name + "' is left recursive.");
}
ret = false;
}
}
if (!ret) { return nullptr; }
// Set root definition
auto &start_rule = grammar[data.start];
// Check infinite loop
for (auto &[name, rule] : grammar) {
DetectInfiniteLoop vis(rule.s_, name);
rule.accept(vis);
if (vis.has_error) {
if (log) {
auto line = line_info(s, vis.error_s);
log(line.first, line.second,
"infinite loop is detected in '" + vis.error_name + "'.");
}
return nullptr;
}
}
// Automatic whitespace skipping
if (grammar.count(WHITESPACE_DEFINITION_NAME)) {
for (auto &x : grammar) {
auto &rule = x.second;
auto ope = rule.get_core_operator();
if (IsLiteralToken::check(*ope)) { rule <= tok(ope); }
}
start_rule.whitespaceOpe =
wsp(grammar[WHITESPACE_DEFINITION_NAME].get_core_operator());
}
// Word expression
if (grammar.count(WORD_DEFINITION_NAME)) {
start_rule.wordOpe = grammar[WORD_DEFINITION_NAME].get_core_operator();
}
// Apply instructions
for (const auto &item : data.instructions) {
const auto &name = item.first;
const auto &instruction = item.second;
auto &rule = grammar[name];
if (instruction.type == "precedence") {
const auto &info =
std::any_cast<PrecedenceClimbing::BinOpeInfo>(instruction.data);
if (!apply_precedence_instruction(rule, info, s, log)) {
return nullptr;
}
} else if (instruction.type == "message") {
rule.error_message = std::any_cast<std::string>(instruction.data);
} else if (instruction.type == "no_ast_opt") {
rule.no_ast_opt = true;
}
}
// Set root definition
start = data.start;
return data.grammar;
}
Grammar g;
};
/*-----------------------------------------------------------------------------
* AST
*---------------------------------------------------------------------------*/
template <typename Annotation> struct AstBase : public Annotation {
AstBase(const char *path, size_t line, size_t column, const char *name,
const std::vector<std::shared_ptr<AstBase>> &nodes,
size_t position = 0, size_t length = 0, size_t choice_count = 0,
size_t choice = 0)
: path(path ? path : ""), line(line), column(column), name(name),
position(position), length(length), choice_count(choice_count),
choice(choice), original_name(name),
original_choice_count(choice_count), original_choice(choice),
tag(str2tag(name)), original_tag(tag), is_token(false), nodes(nodes) {}
AstBase(const char *path, size_t line, size_t column, const char *name,
const std::string_view &token, size_t position = 0, size_t length = 0,
size_t choice_count = 0, size_t choice = 0)
: path(path ? path : ""), line(line), column(column), name(name),
position(position), length(length), choice_count(choice_count),
choice(choice), original_name(name),
original_choice_count(choice_count), original_choice(choice),
tag(str2tag(name)), original_tag(tag), is_token(true), token(token) {}
AstBase(const AstBase &ast, const char *original_name, size_t position = 0,
size_t length = 0, size_t original_choice_count = 0,
size_t original_choise = 0)
: path(ast.path), line(ast.line), column(ast.column), name(ast.name),
position(position), length(length), choice_count(ast.choice_count),
choice(ast.choice), original_name(original_name),
original_choice_count(original_choice_count),
original_choice(original_choise), tag(ast.tag),
original_tag(str2tag(original_name)), is_token(ast.is_token),
token(ast.token), nodes(ast.nodes), parent(ast.parent) {}
const std::string path;
const size_t line = 1;
const size_t column = 1;
const std::string name;
size_t position;
size_t length;
const size_t choice_count;
const size_t choice;
const std::string original_name;
const size_t original_choice_count;
const size_t original_choice;
const unsigned int tag;
const unsigned int original_tag;
const bool is_token;
const std::string_view token;
std::vector<std::shared_ptr<AstBase<Annotation>>> nodes;
std::weak_ptr<AstBase<Annotation>> parent;
std::string token_to_string() const {
assert(is_token);
return std::string(token);
}
template <typename T> T token_to_number() const {
return token_to_number_<T>(token);
}
};
template <typename T>
void ast_to_s_core(const std::shared_ptr<T> &ptr, std::string &s, int level,
std::function<std::string(const T &ast, int level)> fn) {
const auto &ast = *ptr;
for (auto i = 0; i < level; i++) {
s += " ";
}
auto name = ast.original_name;
if (ast.original_choice_count > 0) {
name += "/" + std::to_string(ast.original_choice);
}
if (ast.name != ast.original_name) { name += "[" + ast.name + "]"; }
if (ast.is_token) {
s += "- " + name + " (";
s += ast.token;
s += ")\n";
} else {
s += "+ " + name + "\n";
}
if (fn) { s += fn(ast, level + 1); }
for (auto node : ast.nodes) {
ast_to_s_core(node, s, level + 1, fn);
}
}
template <typename T>
std::string
ast_to_s(const std::shared_ptr<T> &ptr,
std::function<std::string(const T &ast, int level)> fn = nullptr) {
std::string s;
ast_to_s_core(ptr, s, 0, fn);
return s;
}
struct AstOptimizer {
AstOptimizer(bool mode, const std::vector<std::string> &rules = {})
: mode_(mode), rules_(rules) {}
template <typename T>
std::shared_ptr<T> optimize(std::shared_ptr<T> original,
std::shared_ptr<T> parent = nullptr) {
auto found =
std::find(rules_.begin(), rules_.end(), original->name) != rules_.end();
bool opt = mode_ ? !found : found;
if (opt && original->nodes.size() == 1) {
auto child = optimize(original->nodes[0], parent);
return std::make_shared<T>(*child, original->name.data(),
original->choice_count, original->position,
original->length, original->choice);
}
auto ast = std::make_shared<T>(*original);
ast->parent = parent;
ast->nodes.clear();
for (auto node : original->nodes) {
auto child = optimize(node, ast);
ast->nodes.push_back(child);
}
return ast;
}
private:
const bool mode_;
const std::vector<std::string> rules_;
};
struct EmptyType {};
using Ast = AstBase<EmptyType>;
template <typename T = Ast> void add_ast_action(Definition &rule) {
rule.action = [&](const SemanticValues &vs) {
auto line = vs.line_info();
if (rule.is_token()) {
return std::make_shared<T>(
vs.path, line.first, line.second, rule.name.data(), vs.token(),
std::distance(vs.ss, vs.sv().data()), vs.sv().length(),
vs.choice_count(), vs.choice());
}
auto ast =
std::make_shared<T>(vs.path, line.first, line.second, rule.name.data(),
vs.transform<std::shared_ptr<T>>(),
std::distance(vs.ss, vs.sv().data()),
vs.sv().length(), vs.choice_count(), vs.choice());
for (auto node : ast->nodes) {
node->parent = ast;
}
return ast;
};
}
#define PEG_EXPAND(...) __VA_ARGS__
#define PEG_CONCAT(a, b) a##b
#define PEG_CONCAT2(a, b) PEG_CONCAT(a, b)
#define PEG_PICK( \
a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15, a16, \
a17, a18, a19, a20, a21, a22, a23, a24, a25, a26, a27, a28, a29, a30, a31, \
a32, a33, a34, a35, a36, a37, a38, a39, a40, a41, a42, a43, a44, a45, a46, \
a47, a48, a49, a50, a51, a52, a53, a54, a55, a56, a57, a58, a59, a60, a61, \
a62, a63, a64, a65, a66, a67, a68, a69, a70, a71, a72, a73, a74, a75, a76, \
a77, a78, a79, a80, a81, a82, a83, a84, a85, a86, a87, a88, a89, a90, a91, \
a92, a93, a94, a95, a96, a97, a98, a99, a100, ...) \
a100
#define PEG_COUNT(...) \
PEG_EXPAND(PEG_PICK( \
__VA_ARGS__, 100, 99, 98, 97, 96, 95, 94, 93, 92, 91, 90, 89, 88, 87, \
86, 85, 84, 83, 82, 81, 80, 79, 78, 77, 76, 75, 74, 73, 72, 71, 70, 69, \
68, 67, 66, 65, 64, 63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, \
50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, \
32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, \
14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0))
#define PEG_DEF_1(r) \
peg::Definition r; \
r.name = #r; \
peg::add_ast_action(r);
#define PEG_DEF_2(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_1(__VA_ARGS__))
#define PEG_DEF_3(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_2(__VA_ARGS__))
#define PEG_DEF_4(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_3(__VA_ARGS__))
#define PEG_DEF_5(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_4(__VA_ARGS__))
#define PEG_DEF_6(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_5(__VA_ARGS__))
#define PEG_DEF_7(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_6(__VA_ARGS__))
#define PEG_DEF_8(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_7(__VA_ARGS__))
#define PEG_DEF_9(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_8(__VA_ARGS__))
#define PEG_DEF_10(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_9(__VA_ARGS__))
#define PEG_DEF_11(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_10(__VA_ARGS__))
#define PEG_DEF_12(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_11(__VA_ARGS__))
#define PEG_DEF_13(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_12(__VA_ARGS__))
#define PEG_DEF_14(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_13(__VA_ARGS__))
#define PEG_DEF_15(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_14(__VA_ARGS__))
#define PEG_DEF_16(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_15(__VA_ARGS__))
#define PEG_DEF_17(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_16(__VA_ARGS__))
#define PEG_DEF_18(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_17(__VA_ARGS__))
#define PEG_DEF_19(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_18(__VA_ARGS__))
#define PEG_DEF_20(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_19(__VA_ARGS__))
#define PEG_DEF_21(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_20(__VA_ARGS__))
#define PEG_DEF_22(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_21(__VA_ARGS__))
#define PEG_DEF_23(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_22(__VA_ARGS__))
#define PEG_DEF_24(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_23(__VA_ARGS__))
#define PEG_DEF_25(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_24(__VA_ARGS__))
#define PEG_DEF_26(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_25(__VA_ARGS__))
#define PEG_DEF_27(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_26(__VA_ARGS__))
#define PEG_DEF_28(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_27(__VA_ARGS__))
#define PEG_DEF_29(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_28(__VA_ARGS__))
#define PEG_DEF_30(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_29(__VA_ARGS__))
#define PEG_DEF_31(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_30(__VA_ARGS__))
#define PEG_DEF_32(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_31(__VA_ARGS__))
#define PEG_DEF_33(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_32(__VA_ARGS__))
#define PEG_DEF_34(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_33(__VA_ARGS__))
#define PEG_DEF_35(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_34(__VA_ARGS__))
#define PEG_DEF_36(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_35(__VA_ARGS__))
#define PEG_DEF_37(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_36(__VA_ARGS__))
#define PEG_DEF_38(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_37(__VA_ARGS__))
#define PEG_DEF_39(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_38(__VA_ARGS__))
#define PEG_DEF_40(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_39(__VA_ARGS__))
#define PEG_DEF_41(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_40(__VA_ARGS__))
#define PEG_DEF_42(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_41(__VA_ARGS__))
#define PEG_DEF_43(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_42(__VA_ARGS__))
#define PEG_DEF_44(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_43(__VA_ARGS__))
#define PEG_DEF_45(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_44(__VA_ARGS__))
#define PEG_DEF_46(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_45(__VA_ARGS__))
#define PEG_DEF_47(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_46(__VA_ARGS__))
#define PEG_DEF_48(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_47(__VA_ARGS__))
#define PEG_DEF_49(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_48(__VA_ARGS__))
#define PEG_DEF_50(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_49(__VA_ARGS__))
#define PEG_DEF_51(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_50(__VA_ARGS__))
#define PEG_DEF_52(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_51(__VA_ARGS__))
#define PEG_DEF_53(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_52(__VA_ARGS__))
#define PEG_DEF_54(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_53(__VA_ARGS__))
#define PEG_DEF_55(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_54(__VA_ARGS__))
#define PEG_DEF_56(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_55(__VA_ARGS__))
#define PEG_DEF_57(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_56(__VA_ARGS__))
#define PEG_DEF_58(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_57(__VA_ARGS__))
#define PEG_DEF_59(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_58(__VA_ARGS__))
#define PEG_DEF_60(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_59(__VA_ARGS__))
#define PEG_DEF_61(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_60(__VA_ARGS__))
#define PEG_DEF_62(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_61(__VA_ARGS__))
#define PEG_DEF_63(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_62(__VA_ARGS__))
#define PEG_DEF_64(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_63(__VA_ARGS__))
#define PEG_DEF_65(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_64(__VA_ARGS__))
#define PEG_DEF_66(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_65(__VA_ARGS__))
#define PEG_DEF_67(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_66(__VA_ARGS__))
#define PEG_DEF_68(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_67(__VA_ARGS__))
#define PEG_DEF_69(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_68(__VA_ARGS__))
#define PEG_DEF_70(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_69(__VA_ARGS__))
#define PEG_DEF_71(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_70(__VA_ARGS__))
#define PEG_DEF_72(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_71(__VA_ARGS__))
#define PEG_DEF_73(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_72(__VA_ARGS__))
#define PEG_DEF_74(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_73(__VA_ARGS__))
#define PEG_DEF_75(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_74(__VA_ARGS__))
#define PEG_DEF_76(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_75(__VA_ARGS__))
#define PEG_DEF_77(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_76(__VA_ARGS__))
#define PEG_DEF_78(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_77(__VA_ARGS__))
#define PEG_DEF_79(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_78(__VA_ARGS__))
#define PEG_DEF_80(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_79(__VA_ARGS__))
#define PEG_DEF_81(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_80(__VA_ARGS__))
#define PEG_DEF_82(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_81(__VA_ARGS__))
#define PEG_DEF_83(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_82(__VA_ARGS__))
#define PEG_DEF_84(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_83(__VA_ARGS__))
#define PEG_DEF_85(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_84(__VA_ARGS__))
#define PEG_DEF_86(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_85(__VA_ARGS__))
#define PEG_DEF_87(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_86(__VA_ARGS__))
#define PEG_DEF_88(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_87(__VA_ARGS__))
#define PEG_DEF_89(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_88(__VA_ARGS__))
#define PEG_DEF_90(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_89(__VA_ARGS__))
#define PEG_DEF_91(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_90(__VA_ARGS__))
#define PEG_DEF_92(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_91(__VA_ARGS__))
#define PEG_DEF_93(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_92(__VA_ARGS__))
#define PEG_DEF_94(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_93(__VA_ARGS__))
#define PEG_DEF_95(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_94(__VA_ARGS__))
#define PEG_DEF_96(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_95(__VA_ARGS__))
#define PEG_DEF_97(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_96(__VA_ARGS__))
#define PEG_DEF_98(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_97(__VA_ARGS__))
#define PEG_DEF_99(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_98(__VA_ARGS__))
#define PEG_DEF_100(r1, ...) PEG_EXPAND(PEG_DEF_1(r1) PEG_DEF_99(__VA_ARGS__))
#define AST_DEFINITIONS(...) \
PEG_EXPAND(PEG_CONCAT2(PEG_DEF_, PEG_COUNT(__VA_ARGS__))(__VA_ARGS__))
/*-----------------------------------------------------------------------------
* parser
*---------------------------------------------------------------------------*/
class parser {
public:
parser() = default;
parser(const char *s, size_t n, const Rules &rules) {
load_grammar(s, n, rules);
}
parser(std::string_view sv, const Rules &rules)
: parser(sv.data(), sv.size(), rules) {}
parser(const char *s, size_t n) : parser(s, n, Rules()) {}
parser(std::string_view sv) : parser(sv.data(), sv.size(), Rules()) {}
operator bool() { return grammar_ != nullptr; }
bool load_grammar(const char *s, size_t n, const Rules &rules) {
grammar_ = ParserGenerator::parse(s, n, rules, start_, log);
return grammar_ != nullptr;
}
bool load_grammar(const char *s, size_t n) {
return load_grammar(s, n, Rules());
}
bool load_grammar(std::string_view sv, const Rules &rules) {
return load_grammar(sv.data(), sv.size(), rules);
}
bool load_grammar(std::string_view sv) {
return load_grammar(sv.data(), sv.size());
}
bool parse_n(const char *s, size_t n, const char *path = nullptr) const {
if (grammar_ != nullptr) {
const auto &rule = (*grammar_)[start_];
return post_process(s, n, rule.parse(s, n, path, log));
}
return false;
}
bool parse(std::string_view sv, const char *path = nullptr) const {
return parse_n(sv.data(), sv.size(), path);
}
bool parse_n(const char *s, size_t n, std::any &dt,
const char *path = nullptr) const {
if (grammar_ != nullptr) {
const auto &rule = (*grammar_)[start_];
return post_process(s, n, rule.parse(s, n, dt, path, log));
}
return false;
}
bool parse(std::string_view sv, std::any &dt,
const char *path = nullptr) const {
return parse_n(sv.data(), sv.size(), dt, path);
}
template <typename T>
bool parse_n(const char *s, size_t n, T &val,
const char *path = nullptr) const {
if (grammar_ != nullptr) {
const auto &rule = (*grammar_)[start_];
return post_process(s, n, rule.parse_and_get_value(s, n, val, path, log));
}
return false;
}
template <typename T>
bool parse(std::string_view sv, T &val, const char *path = nullptr) const {
return parse_n(sv.data(), sv.size(), val, path);
}
template <typename T>
bool parse_n(const char *s, size_t n, std::any &dt, T &val,
const char *path = nullptr) const {
if (grammar_ != nullptr) {
const auto &rule = (*grammar_)[start_];
return post_process(s, n,
rule.parse_and_get_value(s, n, dt, val, path, log));
}
return false;
}
template <typename T>
bool parse(const char *s, std::any &dt, T &val,
const char *path = nullptr) const {
auto n = strlen(s);
return parse_n(s, n, dt, val, path);
}
Definition &operator[](const char *s) { return (*grammar_)[s]; }
const Definition &operator[](const char *s) const { return (*grammar_)[s]; }
std::vector<std::string> get_rule_names() const {
std::vector<std::string> rules;
for (auto &[name, _] : *grammar_) {
rules.push_back(name);
}
return rules;
}
void enable_packrat_parsing() {
if (grammar_ != nullptr) {
auto &rule = (*grammar_)[start_];
rule.enablePackratParsing = true;
}
}
void enable_trace(TracerEnter tracer_enter, TracerLeave tracer_leave) {
if (grammar_ != nullptr) {
auto &rule = (*grammar_)[start_];
rule.tracer_enter = tracer_enter;
rule.tracer_leave = tracer_leave;
}
}
template <typename T = Ast> parser &enable_ast() {
for (auto &[_, rule] : *grammar_) {
if (!rule.action) { add_ast_action<T>(rule); }
}
return *this;
}
template <typename T>
std::shared_ptr<T> optimize_ast(std::shared_ptr<T> ast,
bool opt_mode = true) const {
return AstOptimizer(opt_mode, get_no_ast_opt_rules()).optimize(ast);
}
Log log;
private:
bool post_process(const char *s, size_t n,
const Definition::Result &r) const {
auto ret = r.ret && r.len == n;
if (log && !ret) { r.error_info.output_log(log, s, n); }
return ret && !r.recovered;
}
std::vector<std::string> get_no_ast_opt_rules() const {
std::vector<std::string> rules;
for (auto &[name, rule] : *grammar_) {
if (rule.no_ast_opt) { rules.push_back(name); }
}
return rules;
}
std::shared_ptr<Grammar> grammar_;
std::string start_;
};
} // namespace peg
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