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/* MeTA1 configuration lexer for Grecs. -*- c -*- */
%option noinput
%option nounput
%top {
/* MeTA1 configuration lexer for Grecs.
Copyright (C) 2007-2016 Sergey Poznyakoff
Grecs is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
Grecs 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 General Public License for more details.
You should have received a copy of the GNU General Public License along
with Grecs. If not, see <http://www.gnu.org/licenses/>. */
/* This file implements a lexical analyzer for MeTA1 main configuration file.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "grecs.h"
#include "meta1-gram.h"
#include <ctype.h>
}
%{
static int yywrap(void);
static void meta1_line_add_unescape_hex(const char *text, size_t len);
#define YY_USER_ACTION do { \
if (YYSTATE == 0) { \
yylloc.beg = grecs_current_locus_point; \
yylloc.beg.col++; \
} \
grecs_current_locus_point.col += yyleng; \
yylloc.end = grecs_current_locus_point; \
} while (0);
%}
%x COMMENT STR
X [0-9a-fA-F]
%%
/* C-style comments */
"/*" BEGIN (COMMENT);
<COMMENT>[^*\n]* /* eat anything that's not a '*' */
<COMMENT>"*"+[^*/\n]* /* eat up '*'s not followed by '/'s */
<COMMENT>\n grecs_locus_point_advance_line(grecs_current_locus_point);
<COMMENT>"*"+"/" BEGIN (INITIAL);
/* End-of-line comments */
#.*\n { grecs_locus_point_advance_line(grecs_current_locus_point); }
#.* /* end-of-file comment */;
/* Number */
0[xX]{X}+ |
0[0-7]+ |
[1-9][0-9]+ { grecs_line_begin();
grecs_line_add(yytext, yyleng);
yylval.string = grecs_line_finish();
return META1_STRING; }
/* Identifiers (unquoted strings) */
[a-zA-Z0-9_\./:\*-]+ { grecs_line_begin();
grecs_line_add(yytext, yyleng);
yylval.string = grecs_line_finish();
return META1_IDENT; }
/* Quoted strings */
\"[^\\"\n]*\" { grecs_line_begin();
grecs_line_add(yytext + 1, yyleng - 2);
yylval.string = grecs_line_finish();
return META1_STRING; }
\"[^\\"\n]*\\x{X}{1,2} { BEGIN(STR);
grecs_line_begin();
meta1_line_add_unescape_hex(yytext + 1, yyleng - 1);
}
\"[^\\"\n]*\\. { BEGIN(STR);
grecs_line_begin();
grecs_line_acc_grow_unescape_last(yytext + 1,
yyleng - 1,
&yylloc); }
<STR>[^\\"\n]*\\x{X}{1,2} { meta1_line_add_unescape_hex(yytext, yyleng); }
<STR>[^\\"\n]*\\. { grecs_line_acc_grow_unescape_last(yytext, yyleng,
&yylloc); }
<STR>[^\\"\n]*\" { BEGIN(INITIAL);
if (yyleng > 1)
grecs_line_add(yytext, yyleng - 1);
yylval.string = grecs_line_finish();
return META1_STRING; }
<STR>[^\\"\n]*\n { BEGIN(INITIAL);
grecs_error(&yylloc, 0,
_("newline in a string"));
grecs_line_add(yytext, yyleng - 1);
yylval.string = grecs_line_finish();
return META1_STRING; }
/* Other tokens */
[ \t\f][ \t\f]* ;
\n { grecs_locus_point_advance_line(grecs_current_locus_point); }
[,;{}=] return yytext[0];
. { grecs_error(&yylloc, 0,
(isascii(yytext[0]) && isprint(yytext[0])) ?
_("stray character %c") :
_("stray character \\%03o"),
(unsigned char) yytext[0]); }
%%
int
yywrap()
{
return 1;
}
static void
meta1_line_add_unescape_hex(const char *text, size_t len)
{
for (; text[len-1] != 'x' && len > 0; len--)
;
grecs_line_acc_grow(text, len - 2);
grecs_line_acc_grow_char((char) strtoul (text + len, NULL, 16));
}
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