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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 332 insertions, 0 deletions

diff --git a/src/xmlpatterns/parser/qxquerytokenizer_p.h b/src/xmlpatterns/parser/qxquerytokenizer_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtXmlPatterns 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+#ifndef Patternist_XQueryTokenizer_H
+#define Patternist_XQueryTokenizer_H
+
+#include <QHash>
+#include <QSet>
+#include <QStack>
+#include <QString>
+#include <QUrl>
+
+#include "qtokenizer_p.h"
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+namespace QPatternist
+{
+    struct TokenMap;
+
+    /**
+     * @short A hand-written tokenizer which tokenizes XQuery 1.0 & XPath 2.0,
+     * and delivers tokens to the Bison generated parser.
+     *
+     * @author Frans Englich <frans.englich@nokia.com>
+     */
+    class XQueryTokenizer : public Tokenizer
+    {
+    public:
+        /**
+         * Tokenizer states. Organized alphabetically.
+         */
+        enum State
+        {
+            AfterAxisSeparator,
+            AposAttributeContent,
+            Axis,
+            Default,
+            ElementContent,
+            EndTag,
+            ItemType,
+            KindTest,
+            KindTestForPI,
+            NamespaceDecl,
+            NamespaceKeyword,
+            OccurrenceIndicator,
+            Operator,
+            Pragma,
+            PragmaContent,
+            ProcessingInstructionContent,
+            ProcessingInstructionName,
+            QuotAttributeContent,
+            StartTag,
+            VarName,
+            XMLComment,
+            XMLSpaceDecl,
+            XQueryVersion
+        };
+
+        XQueryTokenizer(const QString &query,
+                        const QUrl &location,
+                        const State startingState = Default);
+
+        virtual Token nextToken(YYLTYPE *const sourceLocator);
+        virtual int commenceScanOnly();
+        virtual void resumeTokenizationFrom(const int position);
+
+        /**
+         * Does nothing.
+         */
+        virtual void setParserContext(const ParserContext::Ptr &parseInfo);
+
+    private:
+
+        /**
+         * Returns the character corresponding to the builtin reference @p
+         * reference. For instance, passing @c gt will give you '>' in return.
+         *
+         * If @p reference is an invalid character reference, a null QChar is
+         * returned.
+         *
+         * @see QChar::isNull()
+         */
+        QChar charForReference(const QString &reference);
+
+        inline Token tokenAndChangeState(const TokenType code,
+                                         const State state,
+                                         const int advance = 1);
+        inline Token tokenAndChangeState(const TokenType code,
+                                         const QString &value,
+                                         const State state);
+        inline Token tokenAndAdvance(const TokenType code,
+                                     const int advance = 1);
+        QString tokenizeCharacterReference();
+
+        inline Token tokenizeStringLiteral();
+        inline Token tokenizeNumberLiteral();
+
+        /**
+         * @returns the character @p length characters from the current
+         * position.
+         */
+        inline char peekAhead(const int length = 1) const;
+
+        /**
+         * @returns whether the stream, starting from @p offset from the
+         * current position, matches @p chs. The length of @p chs is @p len.
+         */
+        inline bool aheadEquals(const char *const chs,
+                                const int len,
+                                const int offset = 1) const;
+
+        inline Token tokenizeNCName();
+        static inline bool isOperatorKeyword(const TokenType);
+
+        static inline bool isDigit(const char ch);
+        static inline Token error();
+        inline TokenType consumeWhitespace();
+
+        /**
+         * @short Returns the character at the current position, converted to
+         * @c ASCII.
+         *
+         * Equivalent to calling:
+         *
+         * @code
+         * current().toAscii();
+         * @endcode
+         */
+        inline char peekCurrent() const;
+
+        /**
+         * Disregarding encoding conversion, equivalent to calling:
+         *
+         * @code
+         * peekAhead(0);
+         * @endcode
+         */
+        inline const QChar current() const;
+
+        /**
+         * @p hadWhitespace is always set to a proper value.
+         *
+         * @returns the length of whitespace scanned before reaching "::", or
+         * -1 if something else was found.
+         */
+        int peekForColonColon() const;
+
+        static inline bool isNCNameStart(const QChar ch);
+        static inline bool isNCNameBody(const QChar ch);
+        static inline const TokenMap *lookupKeyword(const QString &keyword);
+        inline void popState();
+        inline void pushState(const State state);
+        inline State state() const;
+        inline void setState(const State s);
+        static bool isTypeToken(const TokenType t);
+
+        inline Token tokenizeNCNameOrQName();
+        /**
+         * Advances m_pos until content is encountered.
+         *
+         * Returned is the length stretching from m_pos when starting, until
+         * @p content is encountered. @p content is not included in the length.
+         */
+        int scanUntil(const char *const content);
+
+        /**
+         * Same as calling:
+         * @code
+         * pushState(currentState());
+         * @endcode
+         */
+        inline void pushState();
+
+        /**
+         * Consumes only whitespace, in the traditional sense. The function exits
+         * if non-whitespace is encountered, such as the start of a comment.
+         *
+         * @returns @c true if the end was reached, otherwise @c false
+         */
+        inline bool consumeRawWhitespace();
+
+        /**
+         * @short Parses comments: <tt>(: comment content :)</tt>. It recurses for
+         * parsing nested comments.
+         *
+         * It is assumed that the start token for the comment, "(:", has
+         * already been parsed.
+         *
+         * Typically, don't call this function, but ignoreWhitespace().
+         *
+         * @see <a href="http://www.w3.org/TR/xpath20/#comments">XML Path Language (XPath)
+         * 2.0, 2.6 Comments</a>
+         * @returns
+         * - SUCCESS if everything went ok
+         * - ERROR if there was an error in parsing one or more comments
+         * - END_OF_FILE if the end was reached
+         */
+        Tokenizer::TokenType consumeComment();
+
+        /**
+         * Determines whether @p code is a keyword
+         * that is followed by a second keyword. For instance <tt>declare
+         * function</tt>.
+         */
+        static inline bool isPhraseKeyword(const TokenType code);
+
+        /**
+         * A set of indexes into a QString, the one being passed to
+         * normalizeEOL() whose characters shouldn't be normalized. */
+        typedef QSet<int> CharacterSkips;
+
+        /**
+         * Returns @p input, normalized according to
+         * <a href="http://www.w3.org/TR/xquery/#id-eol-handling">XQuery 1.0:
+         * An XML Query Language, A.2.3 End-of-Line Handling</a>
+         */
+        static QString normalizeEOL(const QString &input,
+                                    const CharacterSkips &characterSkips);
+
+        inline bool atEnd() const
+        {
+            return m_pos == m_length;
+        }
+
+        Token nextToken();
+        /**
+         * Instead of recognizing and tokenizing embedded expressions in
+         * direct attriute constructors, this function is essentially a mini
+         * recursive-descent parser that has the necessary logic to recognize
+         * embedded expressions and their potentially interfering string literals, in
+         * order to scan to the very end of the attribute value, and return the
+         * whole as a string.
+         *
+         * There is of course syntax errors this function will not detect, but
+         * that is ok since the attributes will be parsed once more.
+         *
+         * An inelegant solution, but which gets the job done.
+         *
+         * @see commenceScanOnly(), resumeTokenizationFrom()
+         */
+        Token attributeAsRaw(const QChar separator,
+                             int &stack,
+                             const int startPos,
+                             const bool inLiteral,
+                             QString &result);
+
+        const QString           m_data;
+        const int               m_length;
+        State                   m_state;
+        QStack<State>           m_stateStack;
+        int                     m_pos;
+
+        /**
+         * The current line number.
+         *
+         * The line number and column number both starts at 1.
+         */
+        int                     m_line;
+
+        /**
+         * The offset into m_length for where
+         * the current column starts. So m_length - m_columnOffset
+         * is the current column.
+         *
+         * The line number and column number both starts at 1.
+         */
+        int                     m_columnOffset;
+
+        const NamePool::Ptr     m_namePool;
+        QStack<Token>           m_tokenStack;
+        QHash<QString, QChar>   m_charRefs;
+        bool                    m_scanOnly;
+
+        Q_DISABLE_COPY(XQueryTokenizer)
+    };
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif