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/* $Id$
Cassowary Incremental Constraint Solver
Original Smalltalk Implementation by Alan Borning
This C++ Implementation by Greg J. Badros, <gjb@cs.washington.edu>
http://www.cs.washington.edu/homes/gjb
(C) 1998, 1999 Greg J. Badros and Alan Borning
See ../LICENSE for legal details regarding this software
ClReader.l - Scanner for constraint parsing.
By Greg J. Badros
*/
%{
/* Get the token numbers that bison created for us
(uses the -d option of bison) */
#include <cassowary/ClReader.h>
#include "ClReader.cc.h"
#ifdef HAVE_CONFIG_H
#include <config.h>
#define CONFIG_H_INCLUDED
#endif
/* global variable for the istream we are reading from;
gets set by PcnParseConstraint */
istream *pxi_lexer;
/* Pass in an extra variable (ClParseData *) to cllex so that
it can look up variable names */
#define YY_DECL int cllex(YYSTYPE *lvalp, void *YYLEX_PARAM)
/* Make lexer reader from the global variable */
#define YY_INPUT(buf,result,max_size) \
do { if (pxi_lexer->get(buf[0]) && buf[0] > 0) result = 1; \
else result = YY_NULL; } while (0)
%}
%option noyywrap
DIGIT [0-9]
ALPHA [A-Za-z]
ALPHANUM [A-Za-z0-9]
ID_OK_PUNC [-_\[\]]
RO_ANNOTATION "?"
ID {ALPHA}({ALPHANUM}|{ID_OK_PUNC})*({RO_ANNOTATION})?
NUMID "{"{DIGIT}+"}"
ws [ \t\n]+
%%
{ws} /* skip whitespace */
\n|";" { return 0; }
">=" { return GEQ; }
">" { return GT; }
"<=" { return LEQ; }
"<" { return LT; }
"==" { return '='; }
"="|"-"|"+"|"*"|"/"|"("|")" { return yytext[0]; }
{DIGIT}+("."{DIGIT}*)? |
"."{DIGIT}+ { lvalp->num = strtod(yytext,0); return NUM; }
{ID} { /* Lookup the variable name */
ClParseData *pclpd = ((ClParseData *) YYLEX_PARAM);
int cch = strlen(yytext);
ClVariable *pclv = NULL;
bool fReadOnly = false;
if (yytext[cch-1] == '?') {
yytext[cch-1] = '\0';
fReadOnly = true;
}
const string str = string(yytext);
pclv = pclpd->_lookup_func(str);
if (!pclv->IsNil()) {
lvalp->pclv = pclv;
return fReadOnly?RO_VAR:VAR;
} else {
pxi_lexer = NULL;
yy_flush_buffer(YY_CURRENT_BUFFER);
throw ExCLParseErrorBadIdentifier(str);
return 0;
}
}
. { pxi_lexer = NULL; throw ExCLParseErrorMisc("Unrecognized character"); }
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