Eliminate MLKStream, introduce MLKBinaryStream and MLKCharacterStream.

1 files changed, 111 insertions, 0 deletions

diff --git a/MLKCharacterStream.m b/MLKCharacterStream.m
new file mode 100644
index 0000000..d64ed3c
--- /dev/null
+++ b/MLKCharacterStream.m
@@ -0,0 +1,111 @@
+/* -*- mode: objc; coding: utf-8 -*- */
+/* Toilet Lisp, 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 "MLKCharacterStream.h"
+#import "runtime-compatibility.h"
+#import "util.h"
+
+#import <Foundation/NSException.h>
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+@implementation MLKCharacterStream
+-(id) init;
+{
+  self = [super init];
+  _cachedChar = 0;
+  _charCached = NO;
+  return self;
+}
+
+-(unichar) readChar
+{
+  if (_charCached)
+    {
+      char ch;
+      ch = _cachedChar;
+      _cachedChar = 0;
+      _charCached = NO;
+      return ch;
+    }
+  else
+    {
+      return [self readCharNoCache];
+    }
+}
+
+-(void) unreadChar:(unichar)ch
+{
+  if (_charCached)
+    [NSException raise:@"MLKInvalidOperationError"
+                 format:@"Attempted to UNREAD-CHAR twice in a row."];
+
+  _charCached = YES;
+  _cachedChar = ch;
+}
+
+-(unichar) peekChar
+{
+  unichar ch = [self readChar];
+  [self unreadChar:ch];
+  return ch;
+}
+
+-(BOOL) isEOF
+{
+  BOOL eofp = NO;
+
+  NS_DURING
+    {
+      [self peekChar];
+    }
+  NS_HANDLER
+    {
+      if ([[localException name] isEqual:@"MLKStreamError"])
+        eofp = YES;
+      else
+        [localException raise];
+    }
+  NS_ENDHANDLER;
+
+  return eofp;
+}
+
+-(void) writeString:(NSString *)string
+{
+  int i;
+  
+  for (i = 0; i < [string length]; i++)
+    [self writeChar:[string characterAtIndex:i]];
+}
+
+-(void) writeChar:(unichar)ch
+{
+  [NSException raise:@"MLKNotImplementedError" format:@""];
+  ch = 0;
+}
+
+-(unichar) readCharNoCache
+{
+  [NSException raise:@"MLKNotImplementedError" format:@""];
+  return 0;
+}
+@end