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/* -*- mode: C -*- */
/* --------------------------------------------------------------------------
libconfig - A library for processing structured configuration files
Copyright (C) 2005-2009 Mark A Lindner
This file is part of libconfig.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License
as published by the Free Software Foundation; either version 2.1 of
the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, see
<http://www.gnu.org/licenses/>.
----------------------------------------------------------------------------
*/
%{
#define YY_EXTRA_TYPE void*
%}
%option nounistd
%option reentrant
%option noyywrap
%option yylineno
%option nounput
%option bison-bridge
%option header-file="scanner.h"
%option outfile="lex.yy.c"
%{
#ifdef _MSC_VER
#pragma warning (disable: 4996)
#endif
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include "grammar.h"
#include "wincompat.h"
/* this is somewhat kludgy, but I wanted to avoid building strings
dynamically during scanning */
static char *make_string(char *s)
{
char *r = ++s;
char *p, *q = r;
size_t len = strlen(r);
int esc = 0;
*(r + --len) = 0;
for(p = r; *p; p++)
{
if(*p == '\\')
{
if(! esc)
{
esc = 1;
continue;
}
}
if(esc)
{
if(*p == 'n')
*(q++) = '\n';
else if(*p == 'r')
*(q++) = '\r';
else if(*p == 'f')
*(q++) = '\f';
else if(*p == 't')
*(q++) = '\t';
else
*(q++) = *p;
esc = 0;
}
else if(*p == '\"') /* if we reached the end of a string segment, ... */
{
/* This construction allows for C-style string concatenation.
We don't bother to check for end-of-string here, as we depend
on the {string} definition to ensure a new opening quote exists.
We do, however, check for and discard all forms of comments
[that is, (#...$|//...$|[/][*]...[*][/])] between string segments. */
while (*++p != '\"') /* ... look for the start of the next segment */
{
if(*p == '#') /* check for #...$ comment */
{
while(*++p != '\n')
{
/* skip the rest of the line */
}
}
else if (*p == '/')
{
if(*++p == '/') /* check for //...$ comment */
{
while (*++p != '\n')
{
/* skip the rest of the line */
}
}
else /* must be '*', lead-in to an old C-style comment */
{
while (*++p != '*' || *(p+1) != '/')
{
/* skip all comment content */
}
++p; /* step to the trailing slash, to skip it as well */
}
}
}
}
else
*(q++) = *p;
}
*q = 0;
return(r);
}
static unsigned long long fromhex(const char *s)
{
#ifdef __MINGW32__
// MinGW's strtoull() seems to be broken; it only returns the lower
// 32 bits...
const char *p = s;
unsigned long long val = 0;
if(*p != '0')
return(0);
++p;
if(*p != 'x' && *p != 'X')
return(0);
for(++p; isxdigit(*p); ++p)
{
val <<= 4;
val |= ((*p < 'A') ? (*p & 0xF) : (9 + (*p & 0x7)));
}
return(val);
#else // ! __MINGW32__
return(strtoull(s, NULL, 16));
#endif // __MINGW32__
}
%}
ws [ \t\f\r\n]+
equals \=|\:
comma ,
group_start \{
group_end \}
true [Tt][Rr][Uu][Ee]
false [Ff][Aa][Ll][Ss][Ee]
name [A-Za-z\*][-A-Za-z0-9_\*]*
quote \"
integer [-+]?[0-9]+
integer64 [-+]?[0-9]+L(L)?
hex 0[Xx][0-9A-Fa-f]+
hex64 0[Xx][0-9A-Fa-f]+L(L)?
float ([-+]?([0-9]*)?\.[0-9]*([eE][-+]?[0-9]+)?)|([-+]?([0-9]+)(\.[0-9]*)?[eE][-+]?[0-9]+)
segment {quote}([^\"\\]|\\.)*{quote}
string {segment}(([ \t\f\r\n]*((#|\/\/).*\n|\/\*(.|\n)*\*\/)*)*{segment})*
end ;
array_start \[
array_end \]
list_start \(
list_end \)
comment (#|\/\/).*$
%x COMMENT
%%
\/\* { BEGIN COMMENT; }
<COMMENT>\*\/ { BEGIN INITIAL; }
<COMMENT>. { /* ignore */ }
<COMMENT>\n { }
{ws} { /* skip */ }
{equals} { return(TOK_EQUALS); }
{comma} { return(TOK_COMMA); }
{group_start} { return(TOK_GROUP_START); }
{group_end} { return(TOK_GROUP_END); }
{true} { yylval->ival = 1; return(TOK_BOOLEAN); }
{false} { yylval->ival = 0; return(TOK_BOOLEAN); }
{name} { yylval->sval = strdup(yytext); return(TOK_NAME); }
{float} { yylval->fval = atof(yytext); return(TOK_FLOAT); }
{integer} { yylval->ival = atoi(yytext); return(TOK_INTEGER); }
{integer64} { yylval->llval = atoll(yytext); return(TOK_INTEGER64); }
{hex} { yylval->ival = strtoul(yytext, NULL, 16); return(TOK_HEX); }
{hex64} { yylval->llval = fromhex(yytext); return(TOK_HEX64); }
{string} { yylval->sval = strdup(make_string(yytext)); return(TOK_STRING); }
{array_start} { return(TOK_ARRAY_START); }
{array_end} { return(TOK_ARRAY_END); }
{list_start} { return(TOK_LIST_START); }
{list_end} { return(TOK_LIST_END); }
{end} { return(TOK_END); }
{comment} { /* ignore */ }
. { return(TOK_GARBAGE); }
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