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/*
* cook - file construction tool
* Copyright (C) 1997 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 expression catenate nodes
*/
#include <expr.h>
#include <expr/catenate.h>
#include <opcode/catenate.h>
#include <opcode/list.h>
#include <opcode/push.h>
#include <str_list.h>
#include <trace.h>
typedef struct expr_catenate_ty expr_catenate_ty;
struct expr_catenate_ty
{
expr_ty inherited;
expr_ty *left;
expr_ty *right;
};
/*
* NAME
* destructor - release expression node resources
*
* SYNOPSIS
* void destructor _((expr_ty *));
*
* DESCRIPTION
* The destructor function is used to release any resources
* (dynamic memory, file descriptors, etc) which may be used the
* this expression node.
*
* CAVEAT
* It does NOT free the expression_node itself (this is the
* destructor, not delete).
*/
static void destructor _((expr_ty *));
static void
destructor(ep)
expr_ty *ep;
{
expr_catenate_ty *this;
assert(ep);
/* assert(ep->method == &method); */
this = (expr_catenate_ty *)ep;
expr_delete(this->left);
expr_delete(this->right);
this->left = 0;
this->right = 0;
}
/*
* NAME
* equal - test expression node equality
*
* SYNOPSIS
* int equal(expr_ty *e1, expr_ty *e2);
*
* DESCRIPTION
* The equal function is called to determine if two expression
* nodes are the same.
*
* RETURNS
* int; 1 if equal, 00 if not
*
* CAVEAT
* The expression nodes are already known to the the same class
* before this method is invoked.
*/
static int equal _((const expr_ty *, const expr_ty *));
static int
equal(a1, a2)
const expr_ty *a1;
const expr_ty *a2;
{
const expr_catenate_ty *e1;
const expr_catenate_ty *e2;
assert(a1);
assert(a2);
/* assert(a1->method == &method); */
/* assert(a2->method == &method); */
e1 = (const expr_catenate_ty *)a1;
e2 = (const expr_catenate_ty *)a2;
return
(
expr_equal(e1->left, e2->left)
&&
expr_equal(e1->right, e2->right)
);
}
/*
* NAME
* code_generate
*
* SYNOPSIS
* void code_generate(const expr_ty *, opcode_list_ty *);
*
* DESCRIPTION
* The code_generate function is used to generate code for the
* expression tree represented by this node.
*/
static void code_generate _((const expr_ty *, opcode_list_ty *));
static void
code_generate(ep, olp)
const expr_ty *ep;
opcode_list_ty *olp;
{
expr_catenate_ty *this;
trace(("expr_catenate::code_generate()\n{\n"/*}*/));
assert(ep);
/* assert(ep->method == &method); */
this = (expr_catenate_ty *)ep;
opcode_list_append(olp, opcode_push_new());
expr_code_generate(this->left, olp);
opcode_list_append(olp, opcode_push_new());
expr_code_generate(this->right, olp);
opcode_list_append(olp, opcode_catenate_new());
trace((/*{*/"}\n"));
}
/*
* NAME
* method - class method table
*
* DESCRIPTION
* This is the class method table. It contains a description of
* the class, its name, size and pointers to its virtual methods.
*
* CAVEAT
* This symbol is NOT to be exported from this file scope.
*/
static expr_method_ty method =
{
"catenate",
sizeof(expr_catenate_ty),
destructor,
equal,
code_generate,
};
/*
* NAME
* expr_catenate_new - create a new catenate expression node
*
* SYNOPSIS
* expr_ty *expr_catenate_new(string_ty *);
*
* DESCRIPTION
* The expr_catenate_new function is used to create a new instance
* of a catenate expression node.
*
* RETURNS
* expr_ty *; pointer to polymorphic expression instance.
*
* CAVEAT
* This function allocates data in dynamic memory. It is the
* caller's responsibility to free this data, using expr_delete,
* when it is no longer required.
*/
expr_ty *
expr_catenate_new(e1, e2)
expr_ty *e1;
expr_ty *e2;
{
expr_ty *ep;
expr_catenate_ty *this;
ep = expr_private_new(&method);
this = (expr_catenate_ty *)ep;
this->left = expr_copy(e1);
this->right = expr_copy(e2);
return ep;
}
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