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@ -1,4 +1,5 @@ |
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#include <map> |
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#include <sstream> |
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#include <string> |
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#include <peglib.h> |
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@ -443,11 +444,449 @@ inline void setup_built_in_functions(Environment& env) { |
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} |
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} |
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bool run( |
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struct Eval |
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{ |
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static Value eval(const peglib::Ast& ast, std::shared_ptr<Environment> env) { |
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using peglib::operator"" _; |
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switch (ast.tag) { |
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case "STATEMENTS"_: return eval_statements(ast, env); |
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case "WHILE"_: return eval_while(ast, env); |
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case "IF"_: return eval_if(ast, env); |
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case "FUNCTION"_: return eval_function(ast, env); |
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case "CALL"_: return eval_call(ast, env); |
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case "ASSIGNMENT"_: return eval_assignment(ast, env); |
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case "LOGICAL_OR"_: return eval_logical_or(ast, env); |
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case "LOGICAL_AND"_: return eval_logical_and(ast, env); |
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case "CONDITION"_: return eval_condition(ast, env); |
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case "UNARY_PLUS"_: return eval_unary_plus(ast, env); |
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case "UNARY_MINUS"_: return eval_unary_minus(ast, env); |
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case "UNARY_NOT"_: return eval_unary_not(ast, env); |
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case "ADDITIVE"_: |
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case "MULTIPLICATIVE"_: return eval_bin_expression(ast, env); |
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case "IDENTIFIER"_: return eval_identifier(ast, env); |
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case "OBJECT"_: return eval_object(ast, env); |
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case "ARRAY"_: return eval_array(ast, env); |
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case "NUMBER"_: return eval_number(ast, env); |
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case "BOOLEAN"_: return eval_bool(ast, env); |
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case "INTERPOLATED_STRING"_: return eval_interpolated_string(ast, env); |
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} |
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if (ast.is_token) { |
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return Value(std::string(ast.token)); |
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} |
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// NOTREACHED
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throw std::logic_error("invalid Ast type"); |
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} |
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private: |
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static Value eval_statements(const peglib::Ast& ast, std::shared_ptr<Environment> env) { |
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if (ast.is_token) { |
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return eval(ast, env); |
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} else if (ast.nodes.empty()) { |
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return Value(); |
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} |
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auto it = ast.nodes.begin(); |
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while (it != ast.nodes.end() - 1) { |
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eval(**it, env); |
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++it; |
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} |
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return eval(**it, env); |
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} |
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static Value eval_while(const peglib::Ast& ast, std::shared_ptr<Environment> env) { |
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for (;;) { |
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auto cond = eval(*ast.nodes[0], env); |
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if (!cond.to_bool()) { |
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break; |
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} |
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eval(*ast.nodes[1], env); |
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} |
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return Value(); |
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} |
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static Value eval_if(const peglib::Ast& ast, std::shared_ptr<Environment> env) { |
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const auto& nodes = ast.nodes; |
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for (auto i = 0u; i < nodes.size(); i += 2) { |
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if (i + 1 == nodes.size()) { |
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return eval(*nodes[i], env); |
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} else { |
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auto cond = eval(*nodes[i], env); |
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if (cond.to_bool()) { |
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return eval(*nodes[i + 1], env); |
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} |
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} |
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} |
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return Value(); |
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} |
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static Value eval_function(const peglib::Ast& ast, std::shared_ptr<Environment> env) { |
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std::vector<FunctionValue::Parameter> params; |
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for (auto node: ast.nodes[0]->nodes) { |
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auto mut = node->nodes[0]->token == "mut"; |
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const auto& name = node->nodes[1]->token; |
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params.push_back({ name, mut }); |
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} |
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auto body = ast.nodes[1]; |
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auto f = FunctionValue( |
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params, |
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[=](std::shared_ptr<Environment> callEnv) { |
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callEnv->append_outer(env); |
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return eval(*body, callEnv); |
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} |
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); |
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return Value(std::move(f)); |
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}; |
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static Value eval_call(const peglib::Ast& ast, std::shared_ptr<Environment> env) { |
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using peglib::operator"" _; |
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Value val = eval(*ast.nodes[0], env); |
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for (auto i = 1u; i < ast.nodes.size(); i++) { |
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const auto& n = *ast.nodes[i]; |
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if (n.original_tag == "ARGUMENTS"_) { |
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// Function call
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const auto& f = val.to_function(); |
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const auto& params = f.data->params; |
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const auto& args = n.nodes; |
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if (params.size() <= args.size()) { |
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auto callEnv = std::make_shared<Environment>(); |
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callEnv->initialize("self", val, false); |
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for (auto iprm = 0u; iprm < params.size(); iprm++) { |
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auto param = params[iprm]; |
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auto arg = args[iprm]; |
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auto val = eval(*arg, env); |
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callEnv->initialize(param.name, val, param.mut); |
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} |
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callEnv->initialize("__LINE__", Value((long)ast.line), false); |
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callEnv->initialize("__COLUMN__", Value((long)ast.column), false); |
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val = f.data->eval(callEnv); |
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} else { |
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std::string msg = "arguments error..."; |
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throw std::runtime_error(msg); |
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} |
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} else if (n.original_tag == "INDEX"_) { |
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// Array reference
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const auto& arr = val.to_array(); |
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auto idx = eval(n, env).to_long(); |
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if (0 <= idx && idx < static_cast<long>(arr.values->size())) { |
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val = arr.values->at(idx); |
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} |
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} else if (n.original_tag == "DOT"_) { |
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// Property
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auto name = n.token; |
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auto prop = val.get_property(name); |
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if (prop.get_type() == Value::Function) { |
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const auto& pf = prop.to_function(); |
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auto f = FunctionValue( |
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pf.data->params, |
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[=](std::shared_ptr<Environment> callEnv) { |
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callEnv->initialize("this", val, false); |
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if (val.get_type() == Value::Object) { |
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callEnv->set_object(val.to_object()); |
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} |
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return pf.data->eval(callEnv); |
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} |
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); |
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val = Value(std::move(f)); |
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} else { |
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val = prop; |
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} |
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} else { |
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throw std::logic_error("invalid internal condition."); |
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} |
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} |
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return val; |
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} |
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static Value eval_logical_or(const peglib::Ast& ast, std::shared_ptr<Environment> env) { |
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if (ast.nodes.size() == 1) { |
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return eval(*ast.nodes[0], env); |
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} else { |
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Value ret; |
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for (auto node: ast.nodes) { |
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ret = eval(*node, env); |
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if (ret.to_bool()) { |
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return ret; |
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} |
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} |
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return ret; |
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} |
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} |
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static Value eval_logical_and(const peglib::Ast& ast, std::shared_ptr<Environment> env) { |
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Value ret; |
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for (auto node: ast.nodes) { |
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ret = eval(*node, env); |
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if (!ret.to_bool()) { |
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return ret; |
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} |
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} |
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return ret; |
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} |
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static Value eval_condition(const peglib::Ast& ast, std::shared_ptr<Environment> env) { |
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if (ast.nodes.size() == 1) { |
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return eval(*ast.nodes[0], env); |
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} else { |
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auto lhs = eval(*ast.nodes[0], env); |
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auto ope = eval(*ast.nodes[1], env).to_string(); |
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auto rhs = eval(*ast.nodes[2], env); |
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if (ope == "==") { |
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return Value(lhs == rhs); |
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} else if (ope == "!=") { |
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return Value(lhs != rhs); |
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} else if (ope == "<=") { |
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return Value(lhs <= rhs); |
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} else if (ope == "<") { |
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return Value(lhs < rhs); |
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} else if (ope == ">=") { |
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return Value(lhs >= rhs); |
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} else if (ope == ">") { |
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return Value(lhs > rhs); |
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} else { |
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throw std::logic_error("invalid internal condition."); |
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} |
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} |
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} |
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static Value eval_unary_plus(const peglib::Ast& ast, std::shared_ptr<Environment> env) { |
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if (ast.nodes.size() == 1) { |
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return eval(*ast.nodes[0], env); |
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} else { |
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return eval(*ast.nodes[1], env); |
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} |
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} |
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static Value eval_unary_minus(const peglib::Ast& ast, std::shared_ptr<Environment> env) { |
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if (ast.nodes.size() == 1) { |
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return eval(*ast.nodes[0], env); |
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} else { |
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return Value(eval(*ast.nodes[1], env).to_long() * -1); |
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} |
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} |
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static Value eval_unary_not(const peglib::Ast& ast, std::shared_ptr<Environment> env) { |
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if (ast.nodes.size() == 1) { |
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return eval(*ast.nodes[0], env); |
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} else { |
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return Value(!eval(*ast.nodes[1], env).to_bool()); |
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} |
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} |
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static Value eval_bin_expression(const peglib::Ast& ast, std::shared_ptr<Environment> env) { |
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auto ret = eval(*ast.nodes[0], env).to_long(); |
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for (auto i = 1u; i < ast.nodes.size(); i += 2) { |
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auto val = eval(*ast.nodes[i + 1], env).to_long(); |
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auto ope = eval(*ast.nodes[i], env).to_string()[0]; |
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switch (ope) { |
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case '+': ret += val; break; |
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case '-': ret -= val; break; |
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case '*': ret *= val; break; |
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case '/': ret /= val; break; |
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case '%': ret %= val; break; |
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} |
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} |
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return Value(ret); |
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} |
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static Value eval_assignment(const peglib::Ast& ast, std::shared_ptr<Environment> env) { |
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const auto& mut = ast.nodes[0]->token; |
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const auto& var = ast.nodes[1]->token; |
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auto val = eval(*ast.nodes[2], env); |
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if (env->has(var)) { |
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env->assign(var, val); |
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} else { |
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env->initialize(var, val, mut == "mut"); |
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} |
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return val; |
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}; |
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static Value eval_identifier(const peglib::Ast& ast, std::shared_ptr<Environment> env) { |
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const auto& var = ast.token; |
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return env->get(var); |
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}; |
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static Value eval_object(const peglib::Ast& ast, std::shared_ptr<Environment> env) { |
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ObjectValue obj; |
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for (auto i = 0u; i < ast.nodes.size(); i++) { |
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const auto& prop = *ast.nodes[i]; |
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const auto& name = prop.nodes[0]->token; |
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auto val = eval(*prop.nodes[1], env); |
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obj.properties->emplace(name, val); |
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} |
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return Value(std::move(obj)); |
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} |
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static Value eval_array(const peglib::Ast& ast, std::shared_ptr<Environment> env) { |
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ArrayValue arr; |
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for (auto i = 0u; i < ast.nodes.size(); i++) { |
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auto expr = ast.nodes[i]; |
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auto val = eval(*expr, env); |
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arr.values->push_back(val); |
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} |
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return Value(std::move(arr)); |
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} |
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static Value eval_number(const peglib::Ast& ast, std::shared_ptr<Environment> env) { |
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return Value(stol(ast.token)); |
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}; |
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static Value eval_bool(const peglib::Ast& ast, std::shared_ptr<Environment> env) { |
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return Value(ast.token == "true"); |
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}; |
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static Value eval_interpolated_string(const peglib::Ast& ast, std::shared_ptr<Environment> env) { |
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std::string s; |
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for (auto node: ast.nodes) { |
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const auto& val = eval(*node, env); |
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s += val.str(); |
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} |
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return Value(std::move(s)); |
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}; |
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}; |
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inline peglib::peg& get_parser() |
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{ |
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using namespace peglib; |
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using namespace std; |
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static auto grammar_ = R"( |
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PROGRAM <- _ STATEMENTS |
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STATEMENTS <- (EXPRESSION (';' _)?)* |
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EXPRESSION <- ASSIGNMENT / LOGICAL_OR |
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ASSIGNMENT <- MUTABLE IDENTIFIER '=' _ EXPRESSION |
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WHILE <- 'while' _ EXPRESSION BLOCK |
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IF <- 'if' _ EXPRESSION BLOCK ('else' _ 'if' _ EXPRESSION BLOCK)* ('else' _ BLOCK)? |
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LOGICAL_OR <- LOGICAL_AND ('||' _ LOGICAL_AND)* |
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LOGICAL_AND <- CONDITION ('&&' _ CONDITION)* |
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CONDITION <- ADDITIVE (CONDITION_OPERATOR ADDITIVE)* |
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ADDITIVE <- UNARY_PLUS (ADDITIVE_OPERATOR UNARY_PLUS)* |
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UNARY_PLUS <- UNARY_PLUS_OPERATOR? UNARY_MINUS |
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UNARY_MINUS <- UNARY_MINUS_OPERATOR? UNARY_NOT |
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UNARY_NOT <- UNARY_NOT_OPERATOR? MULTIPLICATIVE |
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MULTIPLICATIVE <- CALL (MULTIPLICATIVE_OPERATOR CALL)* |
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CALL <- PRIMARY (ARGUMENTS / INDEX / DOT)* |
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ARGUMENTS <- '(' _ (EXPRESSION (',' _ EXPRESSION)*)? ')' _ |
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INDEX <- '[' _ EXPRESSION ']' _ |
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DOT <- '.' _ IDENTIFIER |
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PRIMARY <- WHILE / IF / FUNCTION / IDENTIFIER / OBJECT / ARRAY / NUMBER / BOOLEAN / STRING / INTERPOLATED_STRING / '(' _ EXPRESSION ')' _ |
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FUNCTION <- 'fn' _ PARAMETERS BLOCK |
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PARAMETERS <- '(' _ (PARAMETER (',' _ PARAMETER)*)? ')' _ |
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PARAMETER <- MUTABLE IDENTIFIER |
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BLOCK <- '{' _ STATEMENTS '}' _ |
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CONDITION_OPERATOR <- < ('==' / '!=' / '<=' / '<' / '>=' / '>') > _ |
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ADDITIVE_OPERATOR <- < [-+] > _ |
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UNARY_PLUS_OPERATOR <- < '+' > _ |
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UNARY_MINUS_OPERATOR <- < '-' > _ |
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UNARY_NOT_OPERATOR <- < '!' > _ |
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MULTIPLICATIVE_OPERATOR <- < [*/%] > _ |
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IDENTIFIER <- < [a-zA-Z_][a-zA-Z0-9_]* > _ |
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OBJECT <- '{' _ (OBJECT_PROPERTY (',' _ OBJECT_PROPERTY)*)? '}' _ |
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OBJECT_PROPERTY <- IDENTIFIER ':' _ EXPRESSION |
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ARRAY <- '[' _ (EXPRESSION (',' _ EXPRESSION)*)? ']' _ |
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NUMBER <- < [0-9]+ > _ |
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BOOLEAN <- < ('true' / 'false') > _ |
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STRING <- ['] < (!['] .)* > ['] _ |
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INTERPOLATED_STRING <- '"' ('{' _ EXPRESSION '}' / INTERPOLATED_CONTENT)* '"' _ |
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INTERPOLATED_CONTENT <- (!["{] .) (!["{] .)* |
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MUTABLE <- < 'mut'? > _ |
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~_ <- (Space / EndOfLine / Comment)* |
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Space <- ' ' / '\t' |
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EndOfLine <- '\r\n' / '\n' / '\r' |
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EndOfFile <- !. |
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Comment <- '/*' (!'*/' .)* '*/' / ('#' / '//') (!(EndOfLine / EndOfFile) .)* (EndOfLine / EndOfFile)
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)"; |
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static peg parser; |
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static bool initialized = false; |
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if (!initialized) { |
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initialized = true; |
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parser.log = [&](size_t ln, size_t col, const string& msg) { |
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cerr << ln << ":" << col << ": " << msg << endl; |
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}; |
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if (!parser.load_grammar(grammar_)) { |
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throw logic_error("invalid peg grammar"); |
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} |
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parser.enable_ast(true, { "PARAMETERS", "ARGUMENTS" }); |
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} |
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return parser; |
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} |
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inline bool run( |
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const std::string& path, |
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std::shared_ptr<Environment> env, |
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const char* expr, |
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size_t len, |
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Value& val, |
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std::string& msg, |
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bool print_ast); |
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bool print_ast) |
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{ |
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try { |
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std::shared_ptr<peglib::Ast> ast; |
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auto& parser = get_parser(); |
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parser.log = [&](size_t ln, size_t col, const std::string& err_msg) { |
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std::stringstream ss; |
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ss << path << ":" << ln << ":" << col << ": " << err_msg << std::endl; |
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msg = ss.str(); |
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}; |
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if (parser.parse_n(expr, len, ast)) { |
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if (print_ast) { |
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ast->print(); |
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} |
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val = Eval::eval(*ast, env); |
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return true; |
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} |
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} catch (std::runtime_error& e) { |
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msg = e.what(); |
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} |
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return false; |
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} |
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