88 lines
2.2 KiB
LLVM
88 lines
2.2 KiB
LLVM
|
/* $Id$
|
||
|
|
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"); }
|
||
|
|
|