1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
/* -*- c -*- */
/*
* environment.h
*
* chpp
*
* Copyright (C) 1998 Mark Probst
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __ENVIRONMENT_H__
#define __ENVIRONMENT_H__
#include "dynstring.h"
struct _value;
typedef struct _binding
{
dynstring name;
struct _value *value;
struct _binding *next;
} binding;
typedef struct _environment
{
binding *firstBinding;
struct _environment *parent;
} environment;
extern environment *globalEnvironment;
void initEnvironments (void);
environment* envNew (environment *parent);
void envAddBinding (environment *env, dynstring *name, struct _value *theValue);
void envModifyBinding (environment *env, dynstring *name, struct _value *theValue);
void envModifyOrAddBinding (environment *env, dynstring *name, struct _value *theValue,
environment *defEnv);
binding* envGetBinding (environment *env, dynstring *name);
struct _value* envGetValueForBinding (environment *env, dynstring *name);
void envAddBindings (environment *env, environment *additions);
environment* envNewUnion (environment *env1, environment *env2);
environment* envNewIntersection (environment *env1, environment *env2);
#endif
|