QmlJS: Add semantic highlighting.

Change-Id: If9293244075cff1a52801b50cdbb77248ecd21ea
Reviewed-on: http://codereview.qt.nokia.com/3310
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@nokia.com>

1 files changed, 138 insertions, 0 deletions

diff --git a/src/plugins/texteditor/semantichighlighter.cpp b/src/plugins/texteditor/semantichighlighter.cpp
new file mode 100644
index 0000000000..6c6ad62823
--- /dev/null
+++ b/src/plugins/texteditor/semantichighlighter.cpp
@@ -0,0 +1,138 @@
+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (info@qt.nokia.com)
+**
+**
+** GNU Lesser General Public License Usage
+**
+** 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.
+**
+** Other Usage
+**
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at info@qt.nokia.com.
+**
+**************************************************************************/
+
+#include "semantichighlighter.h"
+
+#include "syntaxhighlighter.h"
+
+#include <utils/qtcassert.h>
+
+#include <QtGui/QTextDocument>
+#include <QtGui/QTextBlock>
+
+using namespace TextEditor;
+using namespace TextEditor::SemanticHighlighter;
+
+void TextEditor::SemanticHighlighter::incrementalApplyExtraAdditionalFormats(
+        SyntaxHighlighter *highlighter,
+        const QFuture<Result> &future,
+        int from, int to,
+        const QHash<int, QTextCharFormat> &kindToFormat)
+{
+    QMap<int, QVector<Result> > blockNumberToResults;
+    for (int i = from; i < to; ++i) {
+        const Result &result = future.resultAt(i);
+        if (!result.line)
+            continue;
+        blockNumberToResults[result.line - 1].append(result);
+    }
+    if (blockNumberToResults.isEmpty())
+        return;
+
+    const int firstResultBlockNumber = blockNumberToResults.constBegin().key();
+
+    // blocks between currentBlockNumber and the last block with results will
+    // be cleaned of additional extra formats if they have no results
+    int currentBlockNumber = 0;
+    for (int i = from - 1; i >= 0; --i) {
+        const Result &result = future.resultAt(i);
+        if (!result.line)
+            continue;
+        const int blockNumber = result.line - 1;
+        if (blockNumber < firstResultBlockNumber) {
+            // stop! found where last format stopped
+            currentBlockNumber = blockNumber + 1;
+            break;
+        } else {
+            // add previous results for the same line to avoid undoing their formats
+            blockNumberToResults[blockNumber].append(result);
+        }
+    }
+
+    QTextDocument *doc = highlighter->document();
+    QTC_ASSERT(currentBlockNumber < doc->blockCount(), return);
+    QTextBlock b = doc->findBlockByNumber(currentBlockNumber);
+
+    QMapIterator<int, QVector<Result> > it(blockNumberToResults);
+    while (b.isValid() && it.hasNext()) {
+        it.next();
+        const int blockNumber = it.key();
+        QTC_ASSERT(blockNumber < doc->blockCount(), return);
+
+        // clear formats of blocks until blockNumber
+        while (currentBlockNumber < blockNumber) {
+            highlighter->setExtraAdditionalFormats(b, QList<QTextLayout::FormatRange>());
+            b = b.next();
+            ++currentBlockNumber;
+        }
+
+        QList<QTextLayout::FormatRange> formats;
+        foreach (const Result &result, it.value()) {
+            QTextLayout::FormatRange formatRange;
+
+            formatRange.format = kindToFormat.value(result.kind);
+            if (!formatRange.format.isValid())
+                continue;
+
+            formatRange.start = result.column - 1;
+            formatRange.length = result.length;
+            formats.append(formatRange);
+        }
+        highlighter->setExtraAdditionalFormats(b, formats);
+        b = b.next();
+        ++currentBlockNumber;
+    }
+}
+
+void TextEditor::SemanticHighlighter::clearExtraAdditionalFormatsUntilEnd(
+        SyntaxHighlighter *highlighter,
+        const QFuture<Result> &future)
+{
+    // find block number of last result
+    int lastBlockNumber = 0;
+    for (int i = future.resultCount() - 1; i >= 0; --i) {
+        const Result &result = future.resultAt(i);
+        if (result.line) {
+            lastBlockNumber = result.line - 1;
+            break;
+        }
+    }
+
+    QTextDocument *doc = highlighter->document();
+    QTC_ASSERT(lastBlockNumber + 1 < doc->blockCount(), return);
+    QTextBlock b = doc->findBlockByNumber(lastBlockNumber + 1);
+
+    while (b.isValid()) {
+        highlighter->setExtraAdditionalFormats(b, QList<QTextLayout::FormatRange>());
+        b = b.next();
+    }
+}