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/* $Id: exexpr.c,v 1.3 2004/12/11 19:26:11 ellson Exp $ $Revision: 1.3 $ */
/* vim:set shiftwidth=4 ts=8: */
/**********************************************************
* This software is part of the graphviz package *
* http://www.graphviz.org/ *
* *
* Copyright (c) 1994-2004 AT&T Corp. *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Corp. *
* *
* Information and Software Systems Research *
* AT&T Research, Florham Park NJ *
**********************************************************/
/*
* 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;
}
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