util/qlalr/examples/dummy-xml/ll/dummy-xml-ll.cpp
changeset 0 1918ee327afb
child 4 3b1da2848fc7
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/util/qlalr/examples/dummy-xml/ll/dummy-xml-ll.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,123 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QLALR module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <cstdlib>
+#include <cstdio>
+
+enum Token {
+    EOF_SYMBOL,
+    LEFT_ANGLE,
+    RIGHT_ANGLE,
+    ANY,
+};
+
+static int current_char;
+static int yytoken;
+static bool in_tag = false;
+
+bool parseXmlStream();
+bool parseTagOrWord();
+bool parseTagName();
+
+inline int nextToken()
+{
+    current_char = fgetc(stdin);
+    if (current_char == EOF) {
+        return (yytoken = EOF_SYMBOL);
+    } else if (current_char == '<') {
+        in_tag = true;
+        return (yytoken = LEFT_ANGLE);
+    } else if (in_tag && current_char == '>') {
+        in_tag = false;
+        return (yytoken = RIGHT_ANGLE);
+    }
+    return (yytoken = ANY);
+}
+
+bool parse()
+{
+    nextToken();
+    return parseXmlStream();
+}
+
+bool parseXmlStream()
+{
+    while (parseTagOrWord())
+        ;
+
+    return true;
+}
+
+bool parseTagOrWord()
+{
+    if (yytoken == LEFT_ANGLE) {
+        nextToken();
+        if (! parseTagName())
+            return false;
+        if (yytoken != RIGHT_ANGLE)
+            return false;
+        nextToken();
+
+        fprintf (stderr, "*** found a tag\n");
+
+    } else if (yytoken == ANY) {
+        nextToken();
+    } else {
+        return false;
+    }
+    return true;
+}
+
+bool parseTagName()
+{
+    while (yytoken == ANY)
+        nextToken();
+
+    return true;
+}
+
+int main()
+{
+    if (parse())
+        printf("OK\n");
+    else
+        printf("KO\n");
+}