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cflexor.lex
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cflexor.lex
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%option nounput
%option noinput
%{
/*
* Copyright (c) 2001 Stephen Williams (steve@icarus.com)
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU
* General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CVS_IDENT
#ident "$Id: cflexor.lex,v 1.11 2007/03/22 16:08:18 steve Exp $"
#endif
# include "cfparse.h"
# include "cfparse_misc.h"
# include "globals.h"
# include <string.h>
static int comment_enter;
static char* trim_trailing_white(char*txt, int trim);
/*
* Mostly copied from the flex manual. Do not make this arbitrary
* depth without checking for looping files.
*/
#define MAX_CMDFILE_DEPTH 15
typedef struct t_cmdfile {
char *cmdfile;
YY_BUFFER_STATE buffer;
} s_cmdfile;
s_cmdfile cmdfile_stack[MAX_CMDFILE_DEPTH];
int cmdfile_stack_ptr = 0;
%}
%x CCOMMENT
%x LCOMMENT
%x PLUS_ARGS
%x FILE_NAME
%%
/* Accept C++ style comments. */
"//".* { comment_enter = YY_START; BEGIN(LCOMMENT); }
<LCOMMENT>. { yymore(); }
<LCOMMENT>\n { cflloc.first_line += 1; BEGIN(comment_enter); }
/* Accept C style comments. */
"/*" { comment_enter = YY_START; BEGIN(CCOMMENT); }
<CCOMMENT>. { yymore(); }
<CCOMMENT>\n { cflloc.first_line += 1; yymore(); }
<CCOMMENT>"*/" { BEGIN(comment_enter); }
/* Accept shell type comments. */
^"#".* { ; }
/* Skip white space. */
[ \t\f\r] { ; }
/* Skip line ends, but also count the line. */
\n { cflloc.first_line += 1; }
"+define+" { BEGIN(PLUS_ARGS); return TOK_DEFINE; }
"+incdir+" { BEGIN(PLUS_ARGS); return TOK_INCDIR; }
"+libdir+" { BEGIN(PLUS_ARGS); return TOK_LIBDIR; }
"+libdir-nocase+" { BEGIN(PLUS_ARGS); return TOK_LIBDIR_NOCASE; }
"+libext+" { BEGIN(PLUS_ARGS); return TOK_LIBEXT; }
"+integer-width+" { BEGIN(PLUS_ARGS); return TOK_INTEGER_WIDTH; }
/* If it is not any known plus-flag, return the generic form. */
"+"[^\n \t\b\f\r+]* {
cflval.text = strdup(yytext);
BEGIN(PLUS_ARGS);
return TOK_PLUSWORD; }
/* Once in PLUS_ARGS mode, words are delimited by +
characters. White space and line end terminate PLUS_ARGS mode,
but + terminates only the word. */
<PLUS_ARGS>[^\n \t\b\f\r+]* {
cflval.text = strdup(yytext);
return TOK_PLUSARG; }
/* Within plusargs, this is a delimiter. */
<PLUS_ARGS>"+" { }
/* White space end plus_args mode. */
<PLUS_ARGS>[ \t\b\f\r] { BEGIN(0); }
<PLUS_ARGS>\n {
cflloc.first_line += 1;
BEGIN(0); }
/* Notice the -a flag. */
"-a" { return TOK_Da; }
/* Notice the -c or -f flag. */
"-c" { return TOK_Dc; }
"-f" { return TOK_Dc; }
/* Notice the -v flag. */
"-v" { return TOK_Dv; }
/* Notice the -y flag. */
"-y" { return TOK_Dy; }
/* This rule matches paths and strings that may be file names. This
is a little bit tricky, as we don't want to mistake a comment for
a string word. */
"/"[\r\n] { /* Special case of file name "/" */
cflval.text = trim_trailing_white(yytext, 0);
return TOK_STRING; }
"/"[^\*\/] { /* A file name that starts with "/". */
yymore();
BEGIN(FILE_NAME); }
[^/\n \t\b\r+-][^/\n\r]* { /* A file name that starts with other than "/" */
yymore();
BEGIN(FILE_NAME); }
<FILE_NAME>"//" {
/* Found a trailing comment. Returning the terminated name. */
cflval.text = trim_trailing_white(yytext, 2);
BEGIN(LCOMMENT);
return TOK_STRING; }
<FILE_NAME>"/"?[^/\n\r]* {
yymore();
/* not a comment... continuing */; }
<FILE_NAME>[\n\r] {
/* No trailing comment. Return the file name. */
cflval.text = trim_trailing_white(yytext, 0);
BEGIN(0);
return TOK_STRING; }
/* Fallback match. */
. { return yytext[0]; }
/* At the end of file switch back to the previous buffer. */
<<EOF>> {
if (--cmdfile_stack_ptr < 0) {
free(current_file);
yyterminate();
} else {
yy_delete_buffer(YY_CURRENT_BUFFER);
yy_switch_to_buffer(cmdfile_stack[cmdfile_stack_ptr].buffer);
free(current_file);
current_file = cmdfile_stack[cmdfile_stack_ptr].cmdfile;
} }
%%
static char* trim_trailing_white(char*text, int trim)
{
char*cp = text + strlen(text);
while (cp > text && trim > 0) {
trim -= 1;
cp -= 1;
*cp = 0;
}
while (cp > text && strchr("\n\r\t\b", cp[-1]))
cp -= 1;
cp[0] = 0;
return strdup(text);
}
int yywrap()
{
return 1;
}
void switch_to_command_file(const char *file)
{
char path[4096];
char *cp;
if (cmdfile_stack_ptr >= MAX_CMDFILE_DEPTH) {
fprintf(stderr, "Error: command files nested too deeply (%d) "
"at %s:%d.\n", MAX_CMDFILE_DEPTH, current_file,
cflloc.first_line);
exit(1);
}
cmdfile_stack[cmdfile_stack_ptr].buffer = YY_CURRENT_BUFFER;
cmdfile_stack[cmdfile_stack_ptr].cmdfile = current_file;
cmdfile_stack_ptr += 1;
/*
* If this is a relative file then add the current path to the
* file name.
*/
if (file[0] != '/') {
strcpy(path, current_file);
cp = strrchr(path, '/');
if (cp == 0) strcpy(path, file); /* A base file. */
else {
*(cp+1) = '\0';
strcat(path, file);
}
} else strcpy(path, file); /* An absolute path. */
yyin = fopen(path, "r");
if (yyin == NULL) {
fprintf(stderr, "Error: unable to read nested command file (%s) "
"at %s:%d.\n", path, current_file, cflloc.first_line);
exit(1);
}
current_file = strdup(path);
yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
cflloc.first_line = 1;
}
void cfreset(FILE*fd, const char*path)
{
yyin = fd;
yyrestart(fd);
current_file = strdup(path);
cflloc.first_line = 1;
}