/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1989-2011 AT&T Intellectual Property *
* and is licensed under the *
* Eclipse Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.eclipse.org/org/documents/epl-v10.html *
* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
/*
* Glenn Fowler
* AT&T Research
*
* expression library
*/
#include "exlib.h"
/*
* return the expression for name or sym coerced to type
*/
Exnode_t*
exexpr(Expr_t* ex, const char* name, Exid_t* sym, int type)
{
if (ex)
{
if (!sym)
sym = name ? (Exid_t*)dtmatch(ex->symbols, name) : &ex->main;
if (sym && sym->lex == PROCEDURE && sym->value)
{
if (type != DELETE)
return excast(ex, sym->value->data.procedure.body, type, NiL, 0);
exfreenode(ex, sym->value);
sym->lex = NAME;
sym->value = 0;
}
}
return 0;
}