80 lines
2.2 KiB
Plaintext
80 lines
2.2 KiB
Plaintext
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%{
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#include <iostream>
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#include <cstdlib>
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#include "lexer.hpp"
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#include "interpreter.hpp"
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#include "parser.hpp"
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#include "location.hh"
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// Original yyterminate() macro returns int. Since we're using Bison 3 variants
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// as tokens, we must redefine it to change type from `int` to `Parser::semantic_type`
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#define yyterminate() stela::Parser::make_END(stela::location());
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// This will track current scanner location.
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// Action is called when length of the token is known.
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#define YY_USER_ACTION this->interpreter.increase_location(yyleng);
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// !!!WARNING!!!
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// Location API is used, but the location is not initialized, 'cause I'm lazy. When making
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// a token with make_{something} method you can pass detailed token location. Current location
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// is accessible with m_driver.location() method. All puzzle elements are there - just
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// pass location value in every action code block below. I'm going to waste more time writing
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// this excuse than putting this boilerplate below...
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//
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// Location class can be found in location.hh and posistion.hh files. It's just a bit too much
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// boilerplate for this small example. Bummer.
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%}
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%option nodefault
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%option noyywrap
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%option c++
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%option yyclass="Lexer"
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%option prefix="stela_"
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%%
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[a-z]+ {
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std::cout << "Scanner: identifier [" << yytext << "]\n";
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return stela::Parser::make_STRING(yytext, stela::location( /* put location data here if you want */ ));
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}
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\( {
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std::cout << "Scanner: '('\n";
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return stela::Parser::make_LEFTPAR(stela::location());
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}
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\) {
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std::cout << "Scanner: ')'\n";
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return stela::Parser::make_RIGHTPAR(stela::location());
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}
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; {
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std::cout << "Scanner: ';'\n";
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return stela::Parser::make_SEMICOLON(stela::location());
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}
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, {
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std::cout << "Scanner: ','\n";
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return stela::Parser::make_COMMA(stela::location());
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}
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[\n\t ] {
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//cout << "Scanner: whitechar (ignored)" << endl;
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}
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[1-9][0-9]* {
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std::cout << "Scanner: decimal number: " << yytext << '\n';
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uint64_t number = strtoull(yytext, 0, 10);
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return stela::Parser::make_NUMBER(number, stela::location());
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}
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. {
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std::cout << "Scanner: unknown character [" << yytext << "]\n";
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}
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<<EOF>> { return yyterminate(); }
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%%
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