MLKEnvironment: add -initWithBindings, -initWithParent, -addBinding, and -addBindings.

1 files changed, 31 insertions, 2 deletions

diff --git a/MLKEnvironment.m b/MLKEnvironment.m
index 56bafb7..e37c888 100644
--- a/MLKEnvironment.m
+++ b/MLKEnvironment.m
@@ -17,12 +17,24 @@
   return self;
 }
 
--(MLKEnvironment *) initWithParent:(MLKEnvironment *)parent
+-(MLKEnvironment *) initWithParent:(MLKEnvironment *)parent bindings:(NSDictionary *)bindings
 {
-  ASSIGN (_bindings, parent->_bindings);
+  _bindings = [[MLKLinkedList alloc] initWithCons:[parent->_bindings firstCons]];
+  [_bindings push: [NSMutableDictionary dictionaryWithCapacity:10]];
+  [self addBindings: bindings];
   return self;
 }
 
+-(MLKEnvironment *) initWithParent:(MLKEnvironment *)parent
+{
+  return [self initWithParent:parent bindings:nil];
+}
+
+-(MLKEnvironment *) initWithBindings:(NSDictionary *)bindings
+{
+  return [self initWithParent:nil bindings:bindings];
+}
+
 -(void) setBinding:(MLKSymbol *)symbol to:(id)value
 {
   MLKCons *cons;
@@ -58,4 +70,21 @@
     raise];
   return nil;
 }
+
+-(void) addBindings:(NSDictionary *)bindings
+{
+  int i;
+  NSArray *keys = [bindings allKeys];
+  int count = [keys count];
+  for (i = 0; i < count; i++)
+    {
+      [self addBinding:[keys objectAtIndex:i] to:[bindings objectForKey:[keys objectAtIndex:i]]];
+    }
+}
+
+-(void) addBinding:(MLKSymbol *)symbol to:(id)value
+{
+  NSMutableDictionary *dict = [[_bindings firstCons] car];
+  [dict setObject:value forKey:symbol];
+}
 @end