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mc_lexer.l
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%{
/* C++ string header, for string ops below */
#include <string>
/* Implementation of yyFlexScanner */
#include "mc_scanner.hpp"
#undef YY_DECL
#define YY_DECL int MC::MC_Scanner::yylex( MC::MC_Parser::semantic_type * const lval, MC::MC_Parser::location_type *loc )
/* typedef to make the returns for the tokens shorter */
using token = MC::MC_Parser::token;
/* define yyterminate as this instead of NULL */
#define yyterminate() return( token::END )
/* msvc2010 requires that we exclude this header file. */
#define YY_NO_UNISTD_H
/* update location on matching */
#define YY_USER_ACTION loc->step(); loc->columns(yyleng);
%}
%option debug
%option nodefault
%option yyclass="MC::MC_Scanner"
%option noyywrap
%option c++
%%
%{ /** Code executed at the beginning of yylex **/
yylval = lval;
%}
[a-z] {
return( token::LOWER );
}
[A-Z] {
return( token::UPPER );
}
[a-zA-Z]+ {
/**
* Section 10.1.5.1 of the 3.0.2 Bison Manual says the
* following should work:
* yylval.build( yytext );
* but it doesn't.
* ref: http://goo.gl/KLn0w2
*/
yylval->build< std::string >( yytext );
return( token::WORD );
}
\n {
// Update line number
loc->lines();
return( token::NEWLINE );
}
. {
return( token::CHAR );
}
%%