Add classes MLKError and MLKStream.

1 files changed, 98 insertions, 0 deletions

diff --git a/MLKStream.m b/MLKStream.m
new file mode 100644
index 0000000..01ed40e
--- /dev/null
+++ b/MLKStream.m
@@ -0,0 +1,98 @@
+/* -*- 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 "MLKStream.h"
+#import "MLKError.h"
+
+
+@implementation MLKStream
+-(MLKStream *) init;
+{
+  return [self initWithInputStream:nil outputStream:nil];
+}
+
+-(MLKStream *) initWithInputStream:(NSInputStream *)input;
+{
+  return [self initWithInputStream:input outputStream:nil];
+}
+
+-(MLKStream *) initWithOutputStream:(NSOutputStream *)output;
+{
+  return [self initWithInputStream:nil outputStream:output];
+}
+
+-(MLKStream *) initWithInputStream:(NSInputStream *)input
+                      outputStream:(NSOutputStream *)output
+{
+  return [self initWithInputStream:input
+               outputStream:output
+               encoding:NSUTF8StringEncoding];
+}
+
+
+-(MLKStream *) initWithInputStream:(NSInputStream *)input
+                      outputStream:(NSOutputStream *)output
+                          encoding:(NSStringEncoding)encoding
+{
+  self = [super init];
+  ASSIGN (_input, input);
+  ASSIGN (_output, output);
+  _encoding = encoding;
+  _cachedChar = 0;
+  _charCached = NO;
+  return self;
+}
+
+-(unichar) readChar
+{
+  uint8_t *buffer;
+  int i;
+  unichar retval;
+  
+  buffer = NULL;
+  for (i = 0; i++;)
+    {
+      NSString *tmpstr;
+
+      buffer = realloc (buffer, i+1);
+      [_input read:(buffer+i) maxLength:1];
+      tmpstr = [[NSString alloc] initWithBytesNoCopy:buffer
+                                 length:(i+1)
+                                 encoding:_encoding
+                                 freeWhenDone:NO];
+      if ([tmpstr length] == 1)
+        {
+          retval = [tmpstr characterAtIndex:0];
+        }
+      [tmpstr release];
+    }
+
+  return retval;
+}
+
+-(void) unreadChar:(unichar)ch
+{
+  if (_charCached)
+    [[MLKError errorWithMessage:@"Attempted to UNREAD-CHAR twice in a row."] raise];
+}
+
+-(BOOL) isEOF
+{
+  return ![_input hasBytesAvailable];
+}
+@end