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se.ll
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se.ll
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/*
* S-Expression Parser
*
* Copyright 2021 Jörgen Brandt <joergen@cuneiform-lang.org>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
%option yylineno
%option noyywrap
%option nounput
%option nodefault
%option reentrant
%option bison-bridge
%option bison-locations
%option prefix="se"
%{
#include "se.tab.hh"
static void unescape( char* s );
%}
%%
"(" { return se::parser::token::LPAREN; }
")" { return se::parser::token::RPAREN; }
"#t" { yylval->bool_val = true; return se::parser::token::TRUE; }
"#f" { yylval->bool_val = false; return se::parser::token::FALSE; }
"-"?[1-9][0-9]*|"0" { yylval->int_val = atol( yytext ); return se::parser::token::INT; }
\"([^\"\\]|\\[\"\\])*\" { unescape( yytext ); yylval->str_val = new std::string { yytext }; return se::parser::token::STRING; }
[ \r\t] {}
\n { ++yylloc->begin.line; }
. { return se::parser::token::SEUNDEF; }
%%
static void unescape( char* s )
{
size_t len = strlen( s );
size_t i = 0;
size_t j = 1;
while( j < len-1 )
{
if( s[j] == '\\' )
++j;
s[i] = s[j];
++i;
++j;
}
s[i] = '\0';
}