mirror of
https://github.com/yhirose/cpp-peglib.git
synced 2024-12-23 04:15:31 +00:00
Working on AST feature.
This commit is contained in:
parent
738fe53e39
commit
b8c2778e2a
122
peglib.h
122
peglib.h
@ -8,18 +8,19 @@
|
||||
#ifndef _CPPPEGLIB_PEGLIB_H_
|
||||
#define _CPPPEGLIB_PEGLIB_H_
|
||||
|
||||
#include <functional>
|
||||
#include <string>
|
||||
#include <limits>
|
||||
#include <memory>
|
||||
#include <mutex>
|
||||
#include <vector>
|
||||
#include <unordered_map>
|
||||
#include <map>
|
||||
#include <algorithm>
|
||||
#include <cassert>
|
||||
#include <cstring>
|
||||
#include <functional>
|
||||
#include <initializer_list>
|
||||
#include <iostream>
|
||||
#include <limits>
|
||||
#include <map>
|
||||
#include <memory>
|
||||
#include <mutex>
|
||||
#include <string>
|
||||
#include <unordered_map>
|
||||
#include <vector>
|
||||
|
||||
namespace peglib {
|
||||
|
||||
@ -86,7 +87,9 @@ public:
|
||||
typename std::enable_if<!std::is_same<T, any>::value>::type*& = enabler
|
||||
>
|
||||
T& get() {
|
||||
assert(content_);
|
||||
if (!content_) {
|
||||
throw std::bad_cast();
|
||||
}
|
||||
auto p = dynamic_cast<holder<T>*>(content_);
|
||||
assert(p);
|
||||
if (!p) {
|
||||
@ -1480,7 +1483,10 @@ private:
|
||||
std::unordered_map<std::string, const char*> references;
|
||||
size_t capture_count;
|
||||
|
||||
Data() : grammar(std::make_shared<Grammar>()), capture_count(0) {}
|
||||
Data()
|
||||
: grammar(std::make_shared<Grammar>())
|
||||
, capture_count(0)
|
||||
{}
|
||||
};
|
||||
|
||||
void make_grammar() {
|
||||
@ -1627,15 +1633,18 @@ private:
|
||||
};
|
||||
|
||||
g["Primary"].actions = {
|
||||
// Default
|
||||
[&](const SemanticValues& sv) {
|
||||
return sv[0];
|
||||
},
|
||||
// Reference
|
||||
[&](const SemanticValues& sv, any& dt) {
|
||||
Data& data = *dt.get<Data*>();
|
||||
const auto& ident = sv[0].val.get<std::string>();
|
||||
data.references[ident] = sv.s; // for error handling
|
||||
return ref(*data.grammar, ident);
|
||||
},
|
||||
// (Expression)
|
||||
[&](const SemanticValues& sv) {
|
||||
return sv[1];
|
||||
},
|
||||
@ -1656,6 +1665,7 @@ private:
|
||||
g["IdentCont"] = [](const char* s, size_t n) {
|
||||
return std::string(s, n);
|
||||
};
|
||||
|
||||
g["Literal"] = [this](const char* s, size_t n) {
|
||||
return lit(resolve_escape_sequence(s, n));
|
||||
};
|
||||
@ -1669,6 +1679,7 @@ private:
|
||||
g["STAR"] = [](const char* s, size_t n) { return *s; };
|
||||
g["PLUS"] = [](const char* s, size_t n) { return *s; };
|
||||
|
||||
|
||||
g["DOT"] = []() { return dot(); };
|
||||
}
|
||||
|
||||
@ -1814,6 +1825,51 @@ private:
|
||||
Grammar g;
|
||||
};
|
||||
|
||||
/*-----------------------------------------------------------------------------
|
||||
* AST
|
||||
*---------------------------------------------------------------------------*/
|
||||
|
||||
struct Ast
|
||||
{
|
||||
Ast(const char* _name, int _type, const std::vector<std::shared_ptr<Ast>>& _nodes)
|
||||
: name(_name), type(_type), is_token(false), nodes(_nodes) {}
|
||||
|
||||
Ast(const char* _name, int _type, const std::string& _token)
|
||||
: name(_name), type(_type), is_token(true), token(_token) {}
|
||||
|
||||
void print() const;
|
||||
|
||||
const std::string name;
|
||||
const int type;
|
||||
const bool is_token;
|
||||
const std::string token;
|
||||
const std::vector<std::shared_ptr<Ast>> nodes;
|
||||
};
|
||||
|
||||
struct AstPrint
|
||||
{
|
||||
AstPrint() : level_(-1) {}
|
||||
|
||||
void print(const Ast& ast) {
|
||||
level_ += 1;
|
||||
for (auto i = 0; i < level_; i++) { std::cout << " "; }
|
||||
if (ast.is_token) {
|
||||
std::cout << ast.name << ": '" << ast.token << "'" << std::endl;
|
||||
} else {
|
||||
std::cout << ast.name << std::endl;
|
||||
}
|
||||
for (auto node : ast.nodes) { print(*node); }
|
||||
level_ -= 1;
|
||||
}
|
||||
|
||||
private:
|
||||
int level_;
|
||||
};
|
||||
|
||||
inline void Ast::print() const {
|
||||
AstPrint().print(*this);
|
||||
}
|
||||
|
||||
/*-----------------------------------------------------------------------------
|
||||
* peg
|
||||
*---------------------------------------------------------------------------*/
|
||||
@ -1966,6 +2022,51 @@ public:
|
||||
}
|
||||
}
|
||||
|
||||
peg& ast_node(const char* name, int type) {
|
||||
(*this)[name] = [=](const SemanticValues& sv) {
|
||||
return std::make_shared<Ast>(name, type, sv.map<std::shared_ptr<Ast>>());
|
||||
};
|
||||
return *this;
|
||||
}
|
||||
|
||||
peg& ast_list(const char* name, int type) {
|
||||
(*this)[name] = [=](const SemanticValues& sv) {
|
||||
if (sv.size() == 1) {
|
||||
std::shared_ptr<Ast> ast = sv[0].get<std::shared_ptr<Ast>>();
|
||||
return ast;
|
||||
}
|
||||
return std::make_shared<Ast>(name, type, sv.map<std::shared_ptr<Ast>>());
|
||||
};
|
||||
return *this;
|
||||
}
|
||||
|
||||
peg& ast_token(const char* name, int type = -1) {
|
||||
(*this)[name] = [=](const SemanticValues& sv) {
|
||||
return std::make_shared<Ast>(name, type, std::string(sv.s, sv.n));
|
||||
};
|
||||
return *this;
|
||||
}
|
||||
|
||||
peg& ast_end() {
|
||||
for (auto& x: *grammar_) {
|
||||
const auto& name = x.first;
|
||||
auto& def = x.second;
|
||||
auto& action = def.actions.front();
|
||||
if (!action) {
|
||||
action = [&](const SemanticValues& sv) {
|
||||
if (sv.size() == 1) {
|
||||
std::shared_ptr<Ast> ast = sv[0].get<std::shared_ptr<Ast>>();
|
||||
return ast;
|
||||
}
|
||||
//std::string msg = "AST handler for '" + name + "' is not defined...";
|
||||
//throw std::logic_error(msg);
|
||||
return std::make_shared<Ast>(name.c_str(), -1, sv.map<std::shared_ptr<Ast>>());
|
||||
};
|
||||
}
|
||||
}
|
||||
return *this;
|
||||
};
|
||||
|
||||
MatchAction match_action;
|
||||
Log log;
|
||||
|
||||
@ -2236,7 +2337,6 @@ private:
|
||||
peg_token_iterator end_iter;
|
||||
};
|
||||
|
||||
|
||||
} // namespace peglib
|
||||
|
||||
#endif
|
||||
|
Loading…
Reference in New Issue
Block a user