constexp.l

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/******************************************************************************
 *
 * 
 *
 *
 * Copyright (C) 1997-2015 by Dimitri van Heesch.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation under the terms of the GNU General Public License is hereby 
 * granted. No representations are made about the suitability of this software 
 * for any purpose. It is provided "as is" without express or implied warranty.
 * See the GNU General Public License for more details.
 *
 * Documents produced by Doxygen are derivative works derived from the
 * input used in their production; they are not affected by this license.
 *
 */
%option never-interactive
%option prefix="constexpYY"
%option nounput
%option reentrant bison-bridge
%option extra-type="struct constexpYY_state *"
%top{
#include <stdint.h>
// forward declare yyscan_t to improve typesafety
#include "constexp_p.h"  
}
 
%{
 
#include "constexp.h"  
#include "cppvalue.h"
#include "ce_parse.hpp" // generated header file
#include "message.h"
 
#define YY_NO_INPUT 1
#define YY_NO_UNISTD_H 1
 
#define USE_STATE2STRING 0
 
#if USE_STATE2STRING
static const char *stateToString(int state);
#endif
 
static yy_size_t yyread(char *buf,yy_size_t max_size,yyscan_t yyscanner);
 
#undef  YY_INPUT
#define YY_INPUT(buf,result,max_size) result=yyread(buf,max_size,yyscanner);
 
%}
 
CONSTSUFFIX ([uU][lL]?[lL]?)|([lL][lL]?[uU]?)
 
 
%%
 
"?"                                { return TOK_QUESTIONMARK; }
":"                                { return TOK_COLON; }
"||"                               { return TOK_OR; }
"&&"                               { return TOK_AND; }
"|"                                { return TOK_BITWISEOR; }
"^"                                { return TOK_BITWISEXOR; }
"&"                                { return TOK_AMPERSAND; }
"!="                               { return TOK_NOTEQUAL; }
"=="                               { return TOK_EQUAL; }
"<"                                { return TOK_LESSTHAN; }
">"                                { return TOK_GREATERTHAN; }
"<="                               { return TOK_LESSTHANOREQUALTO; }
">="                               { return TOK_GREATERTHANOREQUALTO; }
"<<"                               { return TOK_SHIFTLEFT; }
">>"                               { return TOK_SHIFTRIGHT; }
"+"                                { return TOK_PLUS; }
"-"                                { return TOK_MINUS; }
"*"                                { return TOK_STAR; }
"/"                                { return TOK_DIVIDE; }
"%"                                { return TOK_MOD; }
"~"                                { return TOK_TILDE; }
"!"                                { return TOK_NOT; }
"("                                { return TOK_LPAREN; }
")"                                { return TOK_RPAREN; }
"'"(([^\'\n\r\\]+)|(\\(([ntvbrfa\\?'\"])|([0-9]+)|([xX][0-9a-fA-F]+))))"'"   { 
                                     yyextra->strToken=yytext;  
                                     return TOK_CHARACTER; 
                                   }
0[0-7]*{CONSTSUFFIX}?              { yyextra->strToken=yytext; 
                                     return TOK_OCTALINT; 
                                   }
[1-9][0-9]*{CONSTSUFFIX}?          { yyextra->strToken=yytext; 
                                     return TOK_DECIMALINT; 
                                   }
(0x|0X)[0-9a-fA-F]+{CONSTSUFFIX}?  { yyextra->strToken=yytext+2; 
                                     return TOK_HEXADECIMALINT; 
                                   }
(0b|0B)[01]+{CONSTSUFFIX}?         { yyextra->strToken=yytext+2; 
                                     return TOK_BINARYINT; 
                                   }
(([0-9]+\.[0-9]*)|([0-9]*\.[0-9]+))([eE]([\-\+])?[0-9]+)?([fFlL])? { 
                                     yyextra->strToken=yytext; return TOK_FLOAT; 
                                   }
([0-9]+[eE])([\-\+])?[0-9]+([fFlL])? { 
                                     yyextra->strToken=yytext; return TOK_FLOAT; 
                                   }
.                                  
\n
 
%%
 
static yy_size_t yyread(char *buf,yy_size_t max_size,yyscan_t yyscanner)
{
  struct yyguts_t *yyg = (struct yyguts_t*)yyscanner;
  yy_size_t c=0;
  while( c < max_size && yyextra->inputString[yyextra->inputPosition] )
  {
    *buf = yyextra->inputString[yyextra->inputPosition++] ;
    c++; buf++;
  }
  return c;
}
 
struct ConstExpressionParser::Private
{
  yyscan_t yyscanner;
  struct constexpYY_state constexpYY_extra;
};
 
 
ConstExpressionParser::ConstExpressionParser()
{
  p = new Private;
  constexpYYlex_init_extra(&p->constexpYY_extra, &p->yyscanner);
}
 
ConstExpressionParser::~ConstExpressionParser()
{
  constexpYYlex_destroy(p->yyscanner);
  delete p;
}
 
bool ConstExpressionParser::parse(const char *fileName,int lineNr,const std::string &s)
{
  struct yyguts_t *yyg = (struct yyguts_t*)p->yyscanner;
 
#ifdef FLEX_DEBUG
  constexpYYset_debug(1,p->yyscanner);
#endif
 
  yyextra->constExpFileName = fileName;
  yyextra->constExpLineNr = lineNr;
  yyextra->inputString = s;
  yyextra->inputPosition = 0;
  constexpYYrestart( yyin, p->yyscanner );
 
  printlex(yy_flex_debug, true, __FILE__, fileName);
  //printf("Expression: '%s'\n",qPrint(s));
 
  constexpYYparse(p->yyscanner);
 
  //printf("Result: %ld\n",(long)g_resultValue);
  printlex(yy_flex_debug, false, __FILE__, fileName);
  bool result = (long)yyextra->resultValue!=0;
 
  return result;
}
 
extern "C" {
  int constexpYYwrap(yyscan_t yyscanner) { return 1; }
}
 
#if USE_STATE2STRING
#include "constexp.l.h"
#endif