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/*
* cook - file construction tool
* Copyright (C) 1997, 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 manipulate catenate opcodes
*/
#include <cook/opcode/catenate.h>
#include <cook/opcode/context.h>
#include <cook/opcode/private.h>
#include <common/str_list.h>
#include <common/trace.h>
/*
* NAME
* execute
*
* SYNOPSIS
* opcode_status_ty execute(opcode_ty *, opcode_context_ty *);
*
* DESCRIPTION
* The execute function is used to execute the given opcode within
* the given interpretation context.
*
* RETURNS
* opcode_status_ty to indicate the result of the execution
*/
static opcode_status_ty
execute(const opcode_ty *op, opcode_context_ty *icp)
{
string_list_ty *left;
string_list_ty *right;
size_t j;
string_ty *s;
trace(("opcode_catenate::execute()\n{\n"));
(void)op;
/*
* Form the two word lists.
* Tack the last word of the left list
* onto the first word of the right list.
*
* There are other conceivable ways to do this,
* but this definition gives the fewest surprises.
*/
right = opcode_context_string_list_pop(icp);
left = opcode_context_string_list_pop(icp);
switch ((left->nstrings ? 1 : 0) | (right->nstrings ? 2 : 0))
{
case 0:
/* both lists empty */
break;
case 1:
/* right list empty */
for (j = 0; j < left->nstrings; j++)
opcode_context_string_push(icp, left->string[j]);
break;
case 2:
/* left list empty */
for (j = 0; j < right->nstrings; j++)
opcode_context_string_push(icp, right->string[j]);
break;
case 3:
/* at least one word in each list */
for (j = 0; j < left->nstrings - 1; j++)
opcode_context_string_push(icp, left->string[j]);
s = str_catenate(left->string[j], right->string[0]);
opcode_context_string_push(icp, s);
str_free(s);
for (j = 1; j < right->nstrings; j++)
opcode_context_string_push(icp, right->string[j]);
break;
}
string_list_delete(left);
string_list_delete(right);
trace(("return success;\n"));
trace(("}\n"));
return opcode_status_success;
}
/*
* NAME
* method
*
* DESCRIPTION
* The method variable describes this class.
*
* CAVEAT
* This symbol is not exported from this file.
*/
static opcode_method_ty method =
{
"catenate",
sizeof(opcode_ty),
0, /* destructor */
execute,
execute, /* script */
0, /* disassemble */
};
/*
* NAME
* opcode_catenate_new
*
* SYNOPSIS
* opcode_ty *opcode_catenate_new(void);
*
* DESCRIPTION
* The opcode_catenate_new function is used to allocate a new instance
* of a catenate opcode.
*
* RETURNS
* opcode_ty *; use opcode_delete when you are finished with it.
*/
opcode_ty *
opcode_catenate_new(void)
{
opcode_ty *op;
trace(("opcode_catenate_new()\n{\n"));
op = opcode_new(&method);
trace(("return %08lX;\n", (long)op));
trace(("}\n"));
return op;
}
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