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https://github.com/yhirose/cpp-peglib.git
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Supported 'logical or/and'.
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parent
97235c313b
commit
7d08ed92d9
37
language/interpreter.cc
Executable file → Normal file
37
language/interpreter.cc
Executable file → Normal file
@ -15,6 +15,8 @@ struct Eval
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case Function: return eval_function(ast, env);
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case FunctionCall: return eval_function_call(ast, env);
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case Assignment: return eval_assignment(ast, env);
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case LogicalOr: return eval_logical_or(ast, env);
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case LogicalAnd: return eval_logical_and(ast, env);
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case Condition: return eval_condition(ast, env);
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case BinExpresion: return eval_bin_expression(ast, env);
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case Identifier: return eval_identifier(ast, env);
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@ -119,9 +121,37 @@ private:
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throw runtime_error(msg);
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}
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static Value eval_logical_or(const Ast& ast, 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 Ast& ast, 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 Ast& ast, 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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if (ast.nodes.size() > 1) {
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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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@ -137,11 +167,10 @@ private:
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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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}
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} else {
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throw std::logic_error("invalid internal condition.");
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}
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return lhs; // Any
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}
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}
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static Value eval_bin_expression(const Ast& ast, shared_ptr<Environment> env) {
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0
language/interpreter.hpp
Executable file → Normal file
0
language/interpreter.hpp
Executable file → Normal file
0
language/main.cc
Executable file → Normal file
0
language/main.cc
Executable file → Normal file
8
language/parser.cc
Executable file → Normal file
8
language/parser.cc
Executable file → Normal file
@ -18,7 +18,9 @@ static auto g_grammar = R"(
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FUNCTION_CALL <- IDENTIFIER ARGUMENTS
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ARGUMENTS <- '(' _ (EXPRESSION (', ' _ EXPRESSION)*)? ')' _
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PRIMARY <- CONDITION (CONDITION_OPERATOR CONDITION)?
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PRIMARY <- LOGICAL_OR ('||' _ LOGICAL_OR)*
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LOGICAL_OR <- LOGICAL_AND ('&&' _ LOGICAL_AND)*
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LOGICAL_AND <- CONDITION (CONDITION_OPERATOR CONDITION)*
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CONDITION <- TERM (TERM_OPERATOR TERM)*
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TERM <- FACTOR (FACTOR_OPERATOR FACTOR)*
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FACTOR <- WHILE / IF / FUNCTION / FUNCTION_CALL / NUMBER / BOOLEAN / STRING / INTERPOLATED_STRING / IDENTIFIER / '(' _ EXPRESSION ')' _
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@ -72,7 +74,9 @@ peg& get_parser()
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{ peg::AstNodeType::Regular, "PARAMETERS", Undefined },
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{ peg::AstNodeType::Regular, "FUNCTION_CALL", FunctionCall },
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{ peg::AstNodeType::Regular, "ARGUMENTS", Undefined },
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{ peg::AstNodeType::Optimizable, "PRIMARY", Condition },
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{ peg::AstNodeType::Optimizable, "PRIMARY", LogicalOr },
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{ peg::AstNodeType::Optimizable, "LOGICAL_OR", LogicalAnd },
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{ peg::AstNodeType::Optimizable, "LOGICAL_AND", Condition },
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{ peg::AstNodeType::Optimizable, "CONDITION", BinExpresion },
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{ peg::AstNodeType::Optimizable, "TERM", BinExpresion },
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{ peg::AstNodeType::Token, "CONDITION_OPERATOR", Undefined },
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@ -3,7 +3,8 @@
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enum AstTag
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{
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Undefined,
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Statements, While, If, FunctionCall, Assignment, Condition, BinExpresion,
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Statements, While, If, FunctionCall, Assignment,
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LogicalOr, LogicalAnd, Condition, BinExpresion,
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Identifier, InterpolatedString,
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Number, Boolean, Function
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};
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0
language/repl.cc
Executable file → Normal file
0
language/repl.cc
Executable file → Normal file
0
language/repl.hpp
Executable file → Normal file
0
language/repl.hpp
Executable file → Normal file
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