Add class MLKRoot.

1 files changed, 131 insertions, 0 deletions

diff --git a/MLKRoot.m b/MLKRoot.m
new file mode 100644
index 0000000..4492b7b
--- /dev/null
+++ b/MLKRoot.m
@@ -0,0 +1,131 @@
+/* -*- 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 "MLKCons.h"
+#import "MLKPackage.h"
+#import "MLKRoot.h"
+#import "MLKSymbol.h"
+#import "runtime-compatibility.h"
+
+#import <Foundation/NSArray.h>
+#import <Foundation/NSException.h>
+#import <Foundation/NSInvocation.h>
+#import <Foundation/NSMethodSignature.h>
+#import <Foundation/NSNull.h>
+#import <Foundation/NSString.h>
+
+
+static id nullify (id value)
+{
+  if (value)
+    return value;
+  else
+    return [NSNull null];
+}
+
+static id denullify (id value)
+{
+  if (value == [NSNull null])
+    return nil;
+  else
+    return value;
+}
+
+
+static NSMethodSignature *signature;
+static MLKPackage *sys;
+
+
+@implementation MLKRoot
++(void) initialize
+{
+  signature = RETAIN ([self methodSignatureForSelector:@selector(car:)]);
+  sys = [MLKPackage findPackage:@"TOILET-SYSTEM"];
+}
+
++(NSArray *) dispatch:(MLKSymbol *)name withArguments:(NSArray *)args
+{
+  NSInvocation *invocation;
+  NSMutableString *methodName;
+  NSArray *result;
+  SEL selector;
+
+  NS_DURING
+    {
+      if ([sys findSymbol:[name name]] != name)
+        return nil;
+    }
+  NS_HANDLER
+    {
+      NS_VALUERETURN (nil, NSArray *);
+    }
+  NS_ENDHANDLER
+
+  invocation = [NSInvocation invocationWithMethodSignature:signature];
+
+  methodName = [NSMutableString stringWithString:[[name name] lowercaseString]];
+  [methodName replaceOccurrencesOfString:@"-"
+              withString:@"_"
+              options:NSLiteralSearch
+              range:NSMakeRange(0, [methodName length])];
+  [methodName appendString:@":"];
+
+  selector = NSSelectorFromString (methodName);
+  
+  if (!selector || ![self respondsToSelector:selector])
+    return nil;
+
+  [invocation setSelector:selector];
+  [invocation setTarget:self];
+  [invocation setArgument:&args atIndex:2];
+
+  [invocation invoke];
+  [invocation getReturnValue:&result];
+
+  return result;
+}
+
++(NSArray *) car:(NSArray *)args
+{
+  return [NSArray arrayWithObject:nullify([denullify([args objectAtIndex:0]) car])];
+}
+
++(NSArray *) cdr:(NSArray *)args
+{
+  return [NSArray arrayWithObject:nullify([denullify([args objectAtIndex:0]) cdr])];
+}
+
++(NSArray *) set_car:(NSArray *)args
+{
+  [[args objectAtIndex:0] setCar:denullify([args objectAtIndex:1])];
+  return [NSArray arrayWithObject:[args objectAtIndex:1]];
+}
+
++(NSArray *) set_cdr:(NSArray *)args
+{
+  [[args objectAtIndex:0] setCdr:denullify([args objectAtIndex:1])];
+  return [NSArray arrayWithObject:[args objectAtIndex:1]];
+}
+
++(NSArray *) cons:(NSArray *)args
+{
+  return [NSArray arrayWithObject:
+                    [MLKCons cons:denullify([args objectAtIndex:0])
+                             with:denullify([args objectAtIndex:1])]];
+}
+@end