Reader: Add support for quoting.

1 files changed, 61 insertions, 0 deletions

diff --git a/MLKQuoteReader.m b/MLKQuoteReader.m
new file mode 100644
index 0000000..ad43ac8
--- /dev/null
+++ b/MLKQuoteReader.m
@@ -0,0 +1,61 @@
+/* -*- 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 "MLKQuoteReader.h"
+
+#import "MLKCons.h"
+#import "MLKDynamicContext.h"
+#import "MLKReader.h"
+#import "MLKReadtable.h"
+#import "MLKPackage.h"
+#import "MLKStream.h"
+#import "runtime-compatibility.h"
+#import "util.h"
+
+
+@implementation MLKQuoteReader
+-(NSArray *) applyToArray:(NSArray *)arguments
+{
+  MLKStream *stream;
+  MLKReadtable *readtable;
+  MLKPackage *cl;
+  unichar ch;
+  id quoted_form;
+
+  cl = [MLKPackage findPackage:@"COMMON-LISP"];
+
+  stream = [arguments objectAtIndex:0];
+  readtable = [[MLKDynamicContext currentContext]
+                valueForSymbol:[cl intern:@"*READTABLE*"]];
+
+  while ([readtable isWhitespaceCharacter:(ch = [stream readChar])]);
+
+  [stream unreadChar:ch];
+
+  quoted_form = [MLKReader readFromStream:stream
+                           eofError:YES
+                           eofValue:nil
+                           recursive:YES
+                           preserveWhitespace:NO];
+
+  return [NSArray arrayWithObject:
+                    [MLKCons cons:[cl intern:@"QUOTE"]
+                             with:[MLKCons cons:nullify(quoted_form)
+                                           with:nil]]];
+}
+@end