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/*************************************************************************
* Copyright (c) 2011 AT&T Intellectual Property
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-v10.html
*
* Contributors: Details at https://graphviz.org
*************************************************************************/
/*
* Glenn Fowler
* AT&T Research
*
* expression library
*/
#include <expr/exlib.h>
#include <stddef.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 ? dtmatch(ex->symbols, name) : &ex->main;
if (sym && sym->lex == PROCEDURE && sym->value)
{
if (type != DELETE_T)
return excast(ex, sym->value->data.procedure.body, type, NULL, 0);
exfreenode(ex, sym->value);
sym->lex = NAME;
sym->value = 0;
}
}
return 0;
}
/**
* @dir lib/expr
* @brief expression library for lib/gvpr/, API expr.h
*/
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