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/*
* cook - file construction tool
* Copyright (C) 1991-1994, 1997-1999, 2006, 2007 Peter Miller;
* All rights reserved.
*
* This program 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 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, USA.
*
* MANIFEST: functions to perform recipe pattern matching
*/
#include <cook/expr/position.h>
#include <cook/match/private.h>
#include <common/mem.h>
#include <common/str.h>
#include <common/trace.h>
/*
* NAME
* match_delete - dispose of match structure
*
* SYNOPSIS
* void match_delete(match_ty *);
*
* DESCRIPTION
* The match_delete function is used to dispose of a match structure
* allocated by the match_alloc function.
*
* RETURNS
* void
*/
void
match_delete(match_ty *this)
{
trace(("match_delete(this = %08X)\n{\n", this));
if (this->vptr->destructor)
this->vptr->destructor(this);
mem_free(this);
trace(("}\n"));
}
/*
* NAME
* match - attempt to
*
* SYNOPSIS
* match_ty *match(string_ty *pattern, string_ty *string);
*
* DESCRIPTION
* The match function is used to match a pattern with a string.
* The matching fields are filled in in the returned structure.
*
* RETURNS
* match_ty *: a pointer to a match structure in dynamic memory with the
* match fields set as appropriate.
*
* A NULL pointer is returned if the string does not match the
* pattern.
*
* The value MATCH_ERROR will be returned if it was not a valid
* pattern; the error message will have been printed already.
*
* CAVEAT
* The match structure should be released by calling match_delete.,
*/
int
match_attempt(match_ty *mp, string_ty *formal, string_ty *actual,
const expr_position_ty *pp)
{
if (match_compile(mp, formal, pp) < 0)
return -1;
return match_execute(mp, actual, pp);
}
int
match_compile(match_ty *this, string_ty *formal, const expr_position_ty *pp)
{
int result;
trace(("match_compile(this = %08lX, formal = %08lX)\n{\n", (long)this,
(long)formal));
trace_string(formal->str_text);
result = this->vptr->compile(this, formal, pp);
trace(("return %d;\n", result));
trace(("}\n"));
return result;
}
int
match_execute(match_ty *this, string_ty *actual, const expr_position_ty *pp)
{
int result;
trace(("match_execute(this = %08lX, actual = %08lX)\n{\n", (long)this,
(long)actual));
trace_string(actual->str_text);
result = this->vptr->execute(this, actual, pp);
trace(("return %d;\n", result));
trace(("}\n"));
return result;
}
/*
* NAME
* reconstruct - make string from pattern
*
* SYNOPSIS
* string_ty *reconstruct(string_ty *pattern, match_ty *field);
*
* DESCRIPTION
* The reconstruct function is used to rebuild a string from a replacement
* pattern and the match field values.
*
* RETURNS
* string_ty *; pointer to the reconstructed string
* or NULL on error (the error will already have been rinted)
*/
string_ty *
match_reconstruct_lhs(const match_ty *this, string_ty *pattern,
const expr_position_ty *pp)
{
string_ty *result;
trace(("reconstruct(this = %08lX, pattern = %08X)\n{\n", this, pattern));
result = this->vptr->reconstruct_lhs(this, pattern, pp);
trace(("return %08lX;\n", result));
trace(("}\n"));
return result;
}
string_ty *
match_reconstruct_rhs(const match_ty *this, string_ty *pattern,
const expr_position_ty *pp)
{
string_ty *result;
trace(("reconstruct(this = %08lX, pattern = %08X)\n{\n", this, pattern));
result = this->vptr->reconstruct_rhs(this, pattern, pp);
trace(("return %08lX;\n", result));
trace(("}\n"));
return result;
}
int
match_usage_mask(const match_ty *this, string_ty *s, const expr_position_ty *pp)
{
return this->vptr->usage_mask(this, s, pp);
}
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