From 62b2dbaa3d0500abb51ddf88b2e84ff9ebc22846 Mon Sep 17 00:00:00 2001
From: Matthias Andreas Benkard <matthias@benkard.de>
Date: Tue, 24 Jun 2008 15:32:54 +0200
Subject: Add class MLKBinding.

---
 GNUmakefile  | 17 ++++++------
 MLKBinding.h | 42 ++++++++++++++++++++++++++++++
 MLKBinding.m | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 136 insertions(+), 8 deletions(-)
 create mode 100644 MLKBinding.h
 create mode 100644 MLKBinding.m

diff --git a/GNUmakefile b/GNUmakefile
index 7d2eda3..31b6576 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -25,14 +25,15 @@ BUNDLE_NAME = Test
 
 ADDITIONAL_OBJCFLAGS = -Wall
 
-ToiletKit_OBJC_FILES = MLKCharacter.m MLKCons.m MLKDoubleFloat.m	\
-                       MLKDynamicContext.m MLKEndOfFileError.m		\
-                       MLKEnvironment.m MLKError.m MLKFloat.m		\
-                       MLKInteger.m MLKInterpreter.m MLKLinkedList.m	\
-                       MLKLexicalContext.m MLKLexicalEnvironment.m	\
-                       MLKLispValue.m MLKPackage.m MLKParenReader.m	\
-                       MLKRatio.m MLKReader.m MLKReadtable.m		\
-                       MLKReaderError.m MLKSingleFloat.m MLKStream.m	\
+ToiletKit_OBJC_FILES = MLKCharacter.m MLKCons.m MLKBinding.m		\
+                       MLKDoubleFloat.m MLKDynamicContext.m		\
+                       MLKEndOfFileError.m MLKEnvironment.m MLKError.m	\
+                       MLKFloat.m MLKInteger.m MLKInterpreter.m		\
+                       MLKLinkedList.m MLKLexicalContext.m		\
+                       MLKLexicalEnvironment.m MLKLispValue.m		\
+                       MLKPackage.m MLKParenReader.m MLKRatio.m		\
+                       MLKReader.m MLKReadtable.m MLKReaderError.m	\
+                       MLKSingleFloat.m MLKStream.m			\
                        MLKStringInputStream.m MLKSymbol.m		\
                        MLKThrowException.m				\
                        MLKUndefinedVariableException.m			\
diff --git a/MLKBinding.h b/MLKBinding.h
new file mode 100644
index 0000000..8882200
--- /dev/null
+++ b/MLKBinding.h
@@ -0,0 +1,42 @@
+/* -*- mode: objc; coding: utf-8 -*- */
+/* Étoilisp/Mulklisp, a Common Lisp subset for the Étoilé runtime.
+ * Copyright (C) 2008  Matthias Andreas Benkard.
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#import <Foundation/NSObject.h>
+
+
+@interface MLKBinding : NSObject
+{
+  id value;
+}
+
++(void) initialize;
+
+-(MLKBinding *) init;
+-(MLKBinding *) initWithValue:(id)something;
+
++(MLKBinding *) binding;
++(MLKBinding *) bindingWithValue:(id)something;
+
+-(void) setValue:(id)something;
+-(id) value;
+
+-(BOOL) boundp;
+-(void) makunbound;
+
+-(void) dealloc;
+@end
diff --git a/MLKBinding.m b/MLKBinding.m
new file mode 100644
index 0000000..b3e2826
--- /dev/null
+++ b/MLKBinding.m
@@ -0,0 +1,85 @@
+/* -*- mode: objc; coding: utf-8 -*- */
+/* Étoilisp/Mulklisp, a Common Lisp subset for the Étoilé runtime.
+ * Copyright (C) 2008  Matthias Andreas Benkard.
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#import "MLKBinding.h"
+#import "runtime-compatibility.h"
+
+#import <Foundation/NSException.h>
+
+
+static id UNBOUND;
+
+
+@implementation MLKBinding
++(void) initialize
+{
+  UNBOUND = [[NSObject alloc] init];
+}
+
+-(MLKBinding *) init
+{
+  return [self initWithValue:UNBOUND];
+}
+
+-(MLKBinding *) initWithValue:(id)something
+{
+  self = [super init];
+  ASSIGN (value, something);
+  return self;
+}
+
++(MLKBinding *) binding
+{
+  return AUTORELEASE ([[self alloc] init]);
+}
+
++(MLKBinding *) bindingWithValue:(id)something
+{
+  return AUTORELEASE ([[self alloc] initWithValue:something]);
+}
+
+-(void) setValue:(id)something
+{
+  ASSIGN (value, something);
+}
+
+-(id) value
+{
+  if (value == UNBOUND)
+    [NSException raise:@"MLKUnboundVariableError"
+                 format:@""];
+
+  return value;
+}
+
+-(BOOL) boundp
+{
+  return !(value == UNBOUND);
+}
+
+-(void) makunbound
+{
+  ASSIGN (value, UNBOUND);
+}
+
+-(void) dealloc
+{
+  RELEASE (value);
+  [super dealloc];
+}
+@end
-- 
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