331 lines
12 KiB
Plaintext
331 lines
12 KiB
Plaintext
/*
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* This Source Code Form is subject to the terms of the Mozilla Public License
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* v. 2.0. If a copy of the MPL was not distributed with this file, You can
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* obtain one at http://mozilla.org/MPL/2.0/.
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*/
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%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/driver.h"
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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::source
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{
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class lexer;
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}
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}
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%code provides {
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namespace elna::source
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{
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class lexer: public yyFlexLexer
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{
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public:
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yy::location location;
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lexer(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(elna::source::driver& driver);
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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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%parse-param {elna::source::lexer& lexer}
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%param {elna::source::driver& driver}
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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 WHILE DO
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%token CONST VAR PROCEDURE
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%token BEGIN_BLOCK END_BLOCK
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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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%precedence THEN
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%precedence ELSE
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%type <std::unique_ptr<elna::source::integer_literal>> integer_literal;
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%type <std::unique_ptr<elna::source::boolean_literal>> boolean_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::declaration>> variable_declaration;
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%type <std::vector<std::unique_ptr<elna::source::declaration>>> variable_declarations variable_declaration_part
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formal_parameter_list;
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%type <std::unique_ptr<elna::source::type_expression>> type_expression;
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%type <std::unique_ptr<elna::source::expression>> expression pointer summand factor address comparand;
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%type <std::vector<std::unique_ptr<elna::source::expression>>> expressions actual_parameter_list;
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%type <std::unique_ptr<elna::source::variable_expression>> variable_expression;
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%type <std::unique_ptr<elna::source::compound_statement>> compound_statement;
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%type <std::unique_ptr<elna::source::assign_statement>> assign_statement;
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%type <std::unique_ptr<elna::source::call_statement>> call_statement;
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%type <std::unique_ptr<elna::source::while_statement>> while_statement;
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%type <std::unique_ptr<elna::source::if_statement>> if_statement;
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%type <std::unique_ptr<elna::source::statement>> statement;
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%type <std::vector<std::unique_ptr<elna::source::statement>>> statements optional_statements;
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%type <std::unique_ptr<elna::source::procedure_definition>> procedure_definition;
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%type <std::vector<std::unique_ptr<elna::source::procedure_definition>>> procedure_definitions
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procedure_definition_part;
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%type <std::unique_ptr<elna::source::block>> block;
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%%
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program: constant_definition_part procedure_definition_part variable_declaration_part statement DOT
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{
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std::vector<std::unique_ptr<elna::source::definition>> definitions($1.size() + $2.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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for (auto& procedure : $2)
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{
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*definition++ = std::move(procedure);
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}
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driver.tree = std::make_unique<elna::source::program>(elna::source::position{},
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std::move(definitions), std::move($3),
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std::move($4));
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}
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block: constant_definition_part variable_declaration_part statement
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{
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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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$$ = std::make_unique<elna::source::block>(elna::source::position{},
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std::move(definitions), std::move($2), std::move($3));
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};
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procedure_definition:
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PROCEDURE IDENTIFIER formal_parameter_list SEMICOLON block SEMICOLON
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{
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$$ = std::make_unique<elna::source::procedure_definition>(elna::source::position{},
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std::move($2), std::move($5));
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std::swap($$->parameters(), $3);
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};
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procedure_definitions:
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procedure_definition procedure_definitions
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{
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std::swap($$, $2);
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$$.emplace($$.cbegin(), std::move($1));
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}
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| procedure_definition { $$.emplace_back(std::move($1)); }
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procedure_definition_part:
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/* no procedure definitions */ {}
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| procedure_definitions { std::swap($$, $1); }
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integer_literal: NUMBER
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{
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$$ = std::make_unique<elna::source::integer_literal>(elna::source::make_position(@1), $1);
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};
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boolean_literal: BOOLEAN
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{
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$$ = std::make_unique<elna::source::boolean_literal>(elna::source::make_position(@1), $1);
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};
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compound_statement: BEGIN_BLOCK optional_statements END_BLOCK
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{
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$$ = std::make_unique<elna::source::compound_statement>(elna::source::make_position(@1));
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std::swap($$->statements(), $2);
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}
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assign_statement: IDENTIFIER ASSIGNMENT expression
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{
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$$ = std::make_unique<elna::source::assign_statement>(elna::source::make_position(@1), $1, std::move($3));
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}
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call_statement: IDENTIFIER actual_parameter_list
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{
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$$ = std::make_unique<elna::source::call_statement>(elna::source::make_position(@1), $1);
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std::swap($$->arguments(), $2);
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}
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while_statement: WHILE expression DO statement
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{
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$$ = std::make_unique<elna::source::while_statement>(elna::source::make_position(@1),
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std::move($2), std::move($4));
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}
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if_statement:
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IF expression THEN statement
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{
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$$ = std::make_unique<elna::source::if_statement>(elna::source::make_position(@1),
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std::move($2), std::move($4));
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}
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| IF expression THEN statement ELSE statement
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{
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$$ = std::make_unique<elna::source::if_statement>(elna::source::make_position(@1),
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std::move($2), std::move($4), std::move($6));
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}
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pointer:
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integer_literal { $$ = std::move($1); }
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| boolean_literal { $$ = std::move($1); }
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| variable_expression { $$ = std::move($1); }
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| LEFT_PAREN expression RIGHT_PAREN { $$ = std::move($2); }
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summand:
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factor { $$ = std::move($1); }
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| factor MULTIPLICATION factor
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{
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$$ = std::make_unique<elna::source::binary_expression>(elna::source::make_position(@1),
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std::move($1), std::move($3), '*');
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}
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| factor DIVISION factor
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{
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$$ = std::make_unique<elna::source::binary_expression>(elna::source::make_position(@1),
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std::move($1), std::move($3), '/');
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}
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address:
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pointer HAT
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{
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$$ = std::make_unique<elna::source::unary_expression>(elna::source::make_position(@1),
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std::move($1), '^');
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}
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| pointer { $$ = std::move($1); }
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factor:
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AT address
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{
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$$ = std::make_unique<elna::source::unary_expression>(elna::source::make_position(@1),
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std::move($2), '@');
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}
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| address { $$ = std::move($1); }
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comparand:
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summand PLUS summand
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{
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$$ = std::make_unique<elna::source::binary_expression>(elna::source::make_position(@1),
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std::move($1), std::move($3), '+');
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}
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| summand MINUS summand
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{
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$$ = std::make_unique<elna::source::binary_expression>(elna::source::make_position(@1),
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std::move($1), std::move($3), '-');
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}
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| summand { $$ = std::move($1); }
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expression:
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comparand EQUALS comparand
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{
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$$ = std::make_unique<elna::source::binary_expression>(elna::source::make_position(@1),
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std::move($1), std::move($3), '=');
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}
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| comparand NOT_EQUAL comparand
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{
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$$ = std::make_unique<elna::source::binary_expression>(elna::source::make_position(@1),
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std::move($1), std::move($3), 'n');
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}
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| comparand LESS_THAN comparand
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{
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$$ = std::make_unique<elna::source::binary_expression>(elna::source::make_position(@1),
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std::move($1), std::move($3), '<');
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}
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| comparand GREATER_THAN comparand
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{
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$$ = std::make_unique<elna::source::binary_expression>(elna::source::make_position(@1),
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std::move($1), std::move($3), '>');
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}
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| comparand LESS_EQUAL comparand
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{
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$$ = std::make_unique<elna::source::binary_expression>(elna::source::make_position(@1),
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std::move($1), std::move($3), '<');
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}
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| comparand GREATER_EQUAL comparand
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{
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$$ = std::make_unique<elna::source::binary_expression>(elna::source::make_position(@1),
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std::move($1), std::move($3), '>');
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}
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| comparand { $$ = std::move($1); }
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expressions:
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expression COMMA expressions
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{
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std::swap($$, $3);
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$$.emplace($$.cbegin(), std::move($1));
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}
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| expression { $$.emplace_back(std::move($1)); }
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variable_expression: IDENTIFIER
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{ $$ = std::make_unique<elna::source::variable_expression>(elna::source::make_position(@1), $1); }
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statement:
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compound_statement { $$ = std::move($1); }
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| assign_statement { $$ = std::move($1); }
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| call_statement { $$ = std::move($1); }
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| while_statement { $$ = std::move($1); }
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| if_statement { $$ = std::move($1); }
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statements:
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statement SEMICOLON statements
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{
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std::swap($$, $3);
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$$.emplace($$.cbegin(), std::move($1));
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}
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| statement { $$.emplace_back(std::move($1)); }
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optional_statements:
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statements { std::swap($$, $1); }
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| /* no statements */ {}
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type_expression:
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HAT IDENTIFIER
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{
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$$ = std::make_unique<elna::source::type_expression>(elna::source::make_position(@1), $2, true);
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}
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| IDENTIFIER
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{
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$$ = std::make_unique<elna::source::type_expression>(elna::source::make_position(@1), $1, false);
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}
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variable_declaration: IDENTIFIER COLON type_expression
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{
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$$ = std::make_unique<elna::source::declaration>(elna::source::make_position(@1),
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$1, std::move($3));
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};
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variable_declarations:
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variable_declaration COMMA variable_declarations
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{
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std::swap($$, $3);
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$$.emplace($$.cbegin(), std::move($1));
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}
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| variable_declaration { $$.emplace_back(std::move($1)); }
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variable_declaration_part:
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/* no variable declarations */ {}
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| VAR variable_declarations SEMICOLON { std::swap($$, $2); }
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constant_definition: IDENTIFIER EQUALS integer_literal
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{
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$$ = std::make_unique<elna::source::constant_definition>(elna::source::make_position(@1),
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$1, std::move($3));
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};
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constant_definitions:
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constant_definition COMMA constant_definitions
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{
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std::swap($$, $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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formal_parameter_list:
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LEFT_PAREN RIGHT_PAREN {}
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| LEFT_PAREN variable_declarations RIGHT_PAREN { std::swap($$, $2); }
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actual_parameter_list:
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LEFT_PAREN RIGHT_PAREN {}
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| LEFT_PAREN expressions RIGHT_PAREN { std::swap($$, $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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driver.error(loc, message);
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}
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