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/*
* cook - file construction tool
* Copyright (C) 1997, 1998, 1999 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 variable IDs
*/
#include <error_intl.h>
#include <expr/position.h>
#include <id/variable.h>
#include <id/private.h>
#include <opcode/context.h>
#include <trace.h>
typedef struct id_variable_ty id_variable_ty;
struct id_variable_ty
{
id_ty inherited;
string_list_ty value;
};
/*
* NAME
* destructor
*
* SYNOPSIS
* void destructor(id_ty *);
*
* DESCRIPTION
* The destructor function is used to release the resources held by
* an ID instance.
*/
static void destructor _((id_ty *));
static void
destructor(idp)
id_ty *idp;
{
id_variable_ty *this;
trace(("id_variable::destructor(idp = %08lX)\n{\n"/*}*/, (long)idp));
this = (id_variable_ty *)idp;
string_list_destructor(&this->value);
trace((/*{*/"}\n"));
}
/*
* NAME
* evaluate
*
* SYNOPSIS
* int evaluate(id_ty *, const string_list_ty *, string_list_ty *);
*
* DESCRIPTION
* The evaluate function is used to evaluate an ID instance (there
* are several types). The arguments to the evaluation are not to
* be changed, the results are only to be appended (not
* constructor'ed first).
*
* RETURNS
* int; 0 on success, -1 on error.
*/
static int interpret _((id_ty *, opcode_context_ty *,
const expr_position_ty *));
static int
interpret(idp, ocp, pp)
id_ty *idp;
opcode_context_ty *ocp;
const expr_position_ty *pp;
{
id_variable_ty *this;
int status;
string_list_ty *arg;
trace(("id_variable::interpret(idp = %08lX)\n{\n"/*}*/, (long)idp));
this = (id_variable_ty *)idp;
status = 0;
arg = opcode_context_string_list_pop(ocp);
assert(arg->nstrings >= 1);
if (arg->nstrings >= 2)
{
sub_context_ty *scp;
scp = sub_context_new();
sub_var_set(scp, "Name", "%S", arg->string[0]);
error_with_position
(
pp,
scp,
i18n("$name: variable references no arguments")
);
sub_context_delete(scp);
status = -1;
}
string_list_delete(arg);
opcode_context_string_push_list(ocp, &this->value);
trace((/*{*/"}\n"));
return status;
}
/*
* NAME
* method
*
* DESCRIPTION
* The method variable describes this ID class.
*
* CAVEAT
* This symbol is not to be exported from this file (its name is
* not unique).
*/
static id_method_ty method =
{
"variable",
sizeof(id_variable_ty),
destructor,
interpret,
interpret, /* script */
};
/*
* NAME
* id_variable_new
*
* SYNOPSIS
* void id_variable_new(void);
*
* DESCRIPTION
* The id_variable_new function is used to create a new instance of
* a variable ID's value. The given value is copied.
*
* RETURNS
* id_ty *; a pointer to a ID instance is dynamic memory.
*
* CAVEAT
* Use id_instance_delete when you are done with it.
*/
id_ty *
id_variable_new(slp)
string_list_ty *slp;
{
id_ty *idp;
id_variable_ty *this;
trace(("id_variable::new()\n{\n"/*}*/));
idp = id_instance_new(&method);
this = (id_variable_ty *)idp;
string_list_copy_constructor(&this->value, slp);
trace(("return %08lX;\n", (long)idp));
trace((/*{*/"}\n"));
return idp;
}
/*
* NAME
* id_variable_query
*
* SYNOPSIS
* void id_variable_query(void);
*
* DESCRIPTION
* The id_variable_query function is used to extract the string
* list value from the variable.
*/
void
id_variable_query(idp, slp)
id_ty *idp;
string_list_ty *slp;
{
id_variable_ty *this;
trace(("id_variable::query()\n{\n"/*}*/));
if (idp->method != &method)
string_list_constructor(slp);
else
{
this = (id_variable_ty *)idp;
string_list_copy_constructor(slp, &this->value);
}
trace((/*{*/"}\n"));
}
string_list_ty *
id_variable_query2(idp)
id_ty *idp;
{
id_variable_ty *this;
string_list_ty *slp;
trace(("id_variable::query()\n{\n"/*}*/));
if (idp->method != &method)
slp = 0;
else
{
this = (id_variable_ty *)idp;
slp = &this->value;
}
trace((/*{*/"}\n"));
return slp;
}
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