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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 <stdlib.h>
#include <stdio.h>
#include <string.h>
/// destructor for `Exid_t`
static void free_exid(void *p) {
Exid_t *const exid = p;
// the `Exid_t` itself was allocated through the program’s `vm` allocator, so
// will be automatically deallocated, but we need to manually clean up the
// `local` set that is used for arrays
dtclose(exid->local);
}
/*
* allocate a new expression program environment
*/
Expr_t*
exopen(Exdisc_t* disc)
{
Expr_t* program;
Exid_t* sym;
if (!(program = calloc(1, sizeof(Expr_t))))
return 0;
static Dtdisc_t symdisc = {.key = offsetof(Exid_t, name), .freef = free_exid};
if (!(program->symbols = dtopen(&symdisc, Dtset))) {
exclose(program);
return 0;
}
program->id = "libexpr:expr";
program->disc = disc;
setcontext(program);
program->file[0] = stdin;
program->file[1] = stdout;
program->file[2] = stderr;
strcpy(program->main.name, "main");
program->main.lex = PROCEDURE;
program->main.index = PROCEDURE;
dtinsert(program->symbols, &program->main);
for (sym = exbuiltin; *sym->name; sym++)
dtinsert(program->symbols, sym);
if ((sym = disc->symbols))
for (; *sym->name; sym++)
dtinsert(program->symbols, sym);
return program;
}
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