From 0f7abae8b9525d60685ae3b9ecc2fb4131c766a4 Mon Sep 17 00:00:00 2001
From: Matthias Andreas Benkard <matthias@benkard.de>
Date: Sat, 26 Jul 2008 19:23:28 +0200
Subject: Reader: Support quasiquotation.

---
 MLKBackquoteReader.m | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 MLKBackquoteReader.m

(limited to 'MLKBackquoteReader.m')

diff --git a/MLKBackquoteReader.m b/MLKBackquoteReader.m
new file mode 100644
index 0000000..47989ab
--- /dev/null
+++ b/MLKBackquoteReader.m
@@ -0,0 +1,62 @@
+/* -*- 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 "MLKBackquoteReader.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 MLKBackquoteReader
+-(NSArray *) applyToArray:(NSArray *)arguments
+{
+  MLKStream *stream;
+  MLKReadtable *readtable;
+  MLKPackage *cl, *sys;
+  unichar ch;
+  id quoted_form;
+
+  cl = [MLKPackage findPackage:@"COMMON-LISP"];
+  sys = [MLKPackage findPackage:@"TOILET-SYSTEM"];
+
+  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:[sys intern:@"QUASIQUOTE"]
+                             with:[MLKCons cons:nullify(quoted_form)
+                                           with:nil]]];
+}
+@end
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