1 files changed, 139 insertions, 0 deletions
diff --git a/NSFileHandle+LispExtensions.m b/NSFileHandle+LispExtensions.m
new file mode 100644
index 0000000..87e4059
--- /dev/null
+++ b/NSFileHandle+LispExtensions.m
@@ -0,0 +1,139 @@
+//
+//  NSFileHandle+LispExtensions.m
+//  Moxie
+//
+//  Created by Brian Cully on Fri Sep 10 2004.
+//  Copyright (c) 2004 Brian Cully. All rights reserved.
+//
+
+#import "NSFileHandle+LispExtensions.h"
+
+@implementation NSFileHandle (LispExtensions)
+- (void)alertDidEndSelector: (NSAlert *)alert
+                 returnCode: (int)returnCode
+                contextInfo: (void *)contextInfo
+{
+    [NSApp terminate: self];
+}
+
+- (unichar)readNextCharFromBufferAndMove: (BOOL)moveFilePointer
+{
+    // XXX: SO not thread safe.
+    static NSString *buffer = nil;
+    static unsigned int bindex = 0;
+    unichar c;
+
+    if (buffer == nil || bindex >= [buffer length]) {
+        NSData *formData;
+
+        formData = [self availableData];
+        if ([formData length] == 0) {
+            [[NSException exceptionWithName: @"REPLDeath" reason: @"The plug in subsystem died." userInfo: nil] raise];
+        } else {
+            if (buffer)
+                [buffer release];
+            buffer = [[NSString alloc] initWithCString: [formData bytes]
+                                                length: [formData length]];
+            bindex = 0;
+        }
+    }
+    c = [buffer characterAtIndex: bindex];
+    if (moveFilePointer)
+        bindex++;
+    return c;
+}
+
+- (NSString *)readLispString
+{
+    NSMutableString *result;
+    unichar c;
+    
+    result = [NSMutableString string];
+    c = [self readNextCharFromBufferAndMove: YES];
+    while ((c = [self readNextCharFromBufferAndMove: YES]) != '"') {
+        if (c == '\\')
+            c = [self readNextCharFromBufferAndMove: YES];
+        [result appendFormat: @"%c", c];
+    }
+    return result;
+}
+
+- (LispSymbol *)readLispSymbol
+{
+    NSMutableString *formString;
+    unichar c;
+
+    formString = [NSMutableString string];
+    c = [self readNextCharFromBufferAndMove: NO];
+    while (c != '(' && c != ')' &&
+           [[NSCharacterSet whitespaceAndNewlineCharacterSet] characterIsMember: c] == NO) {
+        // Handle string lengths.
+        if (c == '"') {
+            [formString appendFormat: @"\"%@\"", [self readLispString]];
+        } else {
+            c = [self readNextCharFromBufferAndMove: YES];
+            [formString appendFormat: @"%c", c];
+        }
+        
+        // Get the next char without swallowing, so we can see if
+        // we use it before we swallow.
+        c = [self readNextCharFromBufferAndMove: NO];
+    }
+    return [LispSymbol symbolNamed: formString];
+}
+
+- (id)readLispAtom
+{
+    id result;
+    unichar c;
+
+    c = [self readNextCharFromBufferAndMove: NO];
+    if (c == '"') {
+        // Parse as a string.
+        result = [self readLispString];
+    } else {
+        result = [self readLispSymbol];
+    }
+    return result;
+}
+
+- (id)readLispForm
+{
+    id result;
+    unichar c;
+
+    result = nil;
+    
+    // Advance past white space and unmatched parens.
+    c = [self readNextCharFromBufferAndMove: NO];
+    while ([[NSCharacterSet whitespaceAndNewlineCharacterSet] characterIsMember: c] ||
+           c == ')') {
+        [self readNextCharFromBufferAndMove: YES];
+        c = [self readNextCharFromBufferAndMove: NO];
+    }
+    
+    // Begin form parsing.
+    if (c == '(') {
+        NSMutableArray *form;
+        
+        // Recursively parse form until closing paren.
+        [self readNextCharFromBufferAndMove: YES];
+        form = [NSMutableArray array];
+        while ([self readNextCharFromBufferAndMove: NO] != ')') {
+            id obj;
+            
+            obj = [self readLispForm];
+            if ([obj isEqual: @"."] == NO) {
+                if ([obj isEqual: @"NIL"])
+                    [form addObject: [NSArray array]];
+                else
+                    [form addObject: obj];
+            }
+        }
+        [self readNextCharFromBufferAndMove: YES];
+        result = form;
+    } else
+        result = [self readLispAtom];
+    return result;
+}
+@end
+\ No newline at end of file