142 lines
4.2 KiB
Plaintext
142 lines
4.2 KiB
Plaintext
%require "3.2"
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%language "c++"
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%code requires {
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#include <cstdint>
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#include <iostream>
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#include "elna/source/parser.hpp"
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#if ! defined(yyFlexLexerOnce)
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#include <FlexLexer.h>
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#endif
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namespace elna::syntax
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{
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class FooLexer;
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}
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}
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%code provides {
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namespace elna::syntax
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{
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class FooLexer : public yyFlexLexer
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{
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public:
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yy::location location;
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FooLexer(std::istream& arg_yyin)
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: yyFlexLexer(&arg_yyin)
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{
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}
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yy::parser::symbol_type lex();
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};
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}
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}
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%define api.token.raw
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%define api.token.constructor
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%define api.value.type variant
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%define parse.assert
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%parse-param {elna::syntax::FooLexer& lexer}
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%parse-param {std::unique_ptr<elna::source::program>& program}
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%locations
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%header
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%code {
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#define yylex lexer.lex
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}
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%start program;
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%token <std::string> IDENTIFIER "identifier"
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%token <std::int32_t> NUMBER "number"
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%token <bool> BOOLEAN
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%token IF THEN WHILE DO
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%token CONST VAR PROCEDURE
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%token BEGIN_BLOCK END_BLOCK
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%token TRUE FALSE
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%token LEFT_PAREN RIGHT_PAREN SEMICOLON DOT COMMA
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%token GREATER_EQUAL LESS_EQUAL LESS_THAN GREATER_THAN NOT_EQUAL EQUALS
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%token PLUS MINUS MULTIPLICATION DIVISION
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%token ASSIGNMENT COLON HAT AT
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%type <std::unique_ptr<elna::source::integer_literal>> integer_literal;
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%type <std::unique_ptr<elna::source::constant_definition>> constant_definition;
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%type <std::vector<std::unique_ptr<elna::source::constant_definition>>> constant_definition_part constant_definitions;
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%type <std::unique_ptr<elna::source::type_expression>> type_expression;
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%%
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program: constant_definition_part
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{
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elna::source::position position;
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std::vector<std::unique_ptr<elna::source::declaration>> declarations;
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std::vector<std::unique_ptr<elna::source::definition>> definitions($1.size());
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std::vector<std::unique_ptr<elna::source::definition>>::iterator definition = definitions.begin();
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for (auto& constant : $1)
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{
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*definition++ = std::move(constant);
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}
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program = std::make_unique<elna::source::program>(position,
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std::move(definitions), std::move(declarations),
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std::make_unique<elna::source::compound_statement>(position));
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}
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integer_literal: NUMBER
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{
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elna::source::position position{
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static_cast<std::size_t>(@1.begin.line),
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static_cast<std::size_t>(@1.begin.column)
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};
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$$ = std::make_unique<elna::source::integer_literal>(position, $1);
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};
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type_expression:
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HAT IDENTIFIER
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{
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elna::source::position position{
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static_cast<std::size_t>(@1.begin.line),
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static_cast<std::size_t>(@1.begin.column)
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};
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$$ = std::make_unique<elna::source::type_expression>(position, $2, true);
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}
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| IDENTIFIER
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{
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elna::source::position position{
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static_cast<std::size_t>(@1.begin.line),
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static_cast<std::size_t>(@1.begin.column)
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};
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$$ = std::make_unique<elna::source::type_expression>(position, $1, false);
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}
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variable_declaration: IDENTIFIER COLON type_expression
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variable_declarations:
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variable_declaration COMMA variable_declarations
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| variable_declaration
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constant_definition: IDENTIFIER EQUALS integer_literal
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{
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elna::source::position position{
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static_cast<std::size_t>(@1.begin.line),
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static_cast<std::size_t>(@1.begin.column)
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};
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$$ = std::make_unique<elna::source::constant_definition>(position,
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$1, std::move($3));
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};
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constant_definitions:
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constant_definition COMMA constant_definitions
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{
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std::swap($$, $3);
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$$.emplace($$.cbegin(), std::move($1));
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}
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| constant_definition { $$.emplace_back(std::move($1)); }
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constant_definition_part:
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/* no constant definitions */ {}
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| CONST constant_definitions SEMICOLON { std::swap($$, $2); };
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%%
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void yy::parser::error(const location_type& loc, const std::string &message)
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{
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std::cerr << "Error: " << message << std::endl;
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}
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