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/* GNU m4 -- A simple macro processor
Copyright (C) 2006-2008, 2010, 2013-2014 Free Software Foundation,
Inc.
This file is part of GNU M4.
GNU M4 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.
GNU M4 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, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <regex.h>
#include <string.h>
#include "m4private.h"
typedef struct {
const char *spec;
const int code;
} m4_resyntax;
/* The syntaxes named in this table are saved into frozen files. Changing
the mappings will break programs that load a frozen file made before
such a change... */
static m4_resyntax const m4_resyntax_map[] =
{
/* First, the canonical definitions for reverse lookups: */
{ "AWK", RE_SYNTAX_AWK },
{ "ED", RE_SYNTAX_ED },
{ "EGREP", RE_SYNTAX_EGREP },
{ "EMACS", RE_SYNTAX_EMACS },
{ "GNU_AWK", RE_SYNTAX_GNU_AWK },
{ "GREP", RE_SYNTAX_GREP },
{ "POSIX_AWK", RE_SYNTAX_POSIX_AWK },
{ "POSIX_BASIC", RE_SYNTAX_POSIX_BASIC },
{ "POSIX_EGREP", RE_SYNTAX_POSIX_EGREP },
{ "POSIX_EXTENDED", RE_SYNTAX_POSIX_EXTENDED },
{ "POSIX_MINIMAL_BASIC", RE_SYNTAX_POSIX_MINIMAL_BASIC },
{ "SED", RE_SYNTAX_SED },
/* The rest are aliases, for forward lookups only: */
{ "", RE_SYNTAX_EMACS },
{ "BASIC", RE_SYNTAX_POSIX_BASIC },
{ "BSD_M4", RE_SYNTAX_POSIX_EXTENDED },
{ "EXTENDED", RE_SYNTAX_POSIX_EXTENDED },
{ "GAWK", RE_SYNTAX_GNU_AWK },
{ "GNU_EGREP", RE_SYNTAX_EGREP },
{ "GNU_EMACS", RE_SYNTAX_EMACS },
{ "GNU_M4", RE_SYNTAX_EMACS },
{ "MINIMAL", RE_SYNTAX_POSIX_MINIMAL_BASIC },
{ "MINIMAL_BASIC", RE_SYNTAX_POSIX_MINIMAL_BASIC },
{ "POSIX_MINIMAL", RE_SYNTAX_POSIX_MINIMAL_BASIC },
/* End marker: */
{ NULL, -1 }
};
/* Return the internal code representing the syntax SPEC, or -1 if
SPEC is invalid. The `m4_syntax_map' table is searched case
insensitively, after replacing any spaces or dashes in SPEC with
underscore characters. Possible matches for the "GNU_M4" element
then, are "gnu m4", "GNU-m4" or "Gnu_M4". */
int
m4_regexp_syntax_encode (const char *spec)
{
const m4_resyntax *resyntax;
char *canonical;
char *p;
/* Unless specified otherwise, return the historical GNU M4 default. */
if (!spec)
return RE_SYNTAX_EMACS;
canonical = xstrdup (spec);
/* Canonicalise SPEC. */
for (p = canonical; *p != '\0'; ++p)
{
if ((*p == ' ') || (*p == '-'))
*p = '_';
else if (islower (to_uchar (*p)))
*p = toupper (to_uchar (*p));
}
for (resyntax = m4_resyntax_map; resyntax->spec != NULL; ++resyntax)
{
if (STREQ (resyntax->spec, canonical))
break;
}
free (canonical);
return resyntax->code;
}
/* Return the syntax specifier that matches CODE, or NULL if there is
no match. */
const char *
m4_regexp_syntax_decode (int code)
{
const m4_resyntax *resyntax;
for (resyntax = m4_resyntax_map; resyntax->spec != NULL; ++resyntax)
{
if (resyntax->code == code)
break;
}
return resyntax->spec;
}
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