Clang: Extract and test action sequence

Change-Id: I66f8f29d7b17be67a55560bdcc0b0a3aeb1ce480
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>

src/plugins/clangcodemodel/activationsequenceprocessor.cpp

@@ -0,0 +1,208 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company.  For licensing terms and
+** conditions see http://www.qt.io/terms-conditions.  For further information
+** use the contact form at http://www.qt.io/contact-us.
+**
+** 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 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file.  Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, The Qt Company gives you certain additional
+** rights.  These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#include "activationsequenceprocessor.h"
+
+namespace ClangCodeModel {
+namespace Internal {
+
+namespace {
+
+QString truncateActivationStringByPosition(const QString &activationString,
+                                           int positionInDocument)
+{
+    if (positionInDocument == 1)
+        return activationString.left(1);
+
+    if (positionInDocument == 2)
+        return activationString.left(2);
+
+    return activationString;
+}
+
+}
+
+ActivationSequenceProcessor::ActivationSequenceProcessor(const QString &activationString,
+                                                         int positionInDocument,
+                                                         bool wantFunctionCall)
+    : m_positionInDocument(positionInDocument),
+      m_wantFunctionCall(wantFunctionCall)
+{
+    extractCharactersBeforePosition(truncateActivationStringByPosition(activationString,
+                                                                       positionInDocument));
+
+    process();
+}
+
+CPlusPlus::Kind ActivationSequenceProcessor::completionKind() const
+{
+    return m_completionKind;
+}
+
+int ActivationSequenceProcessor::offset() const
+{
+    return m_offset;
+}
+
+int ActivationSequenceProcessor::position() const
+{
+    return m_positionInDocument - m_offset;
+}
+
+void ActivationSequenceProcessor::extractCharactersBeforePosition(const QString &activationString)
+{
+    if (activationString.size() >= 3) {
+        m_char1 = activationString[0];
+        m_char2 = activationString[1];
+        m_char3 = activationString[2];
+    } else if (activationString.size() == 2) {
+        m_char2 = activationString[0];
+        m_char3 = activationString[1];
+    } else if (activationString.size() == 1) {
+        m_char3 = activationString[0];
+    }
+}
+
+void ActivationSequenceProcessor::process()
+{
+    processDot();
+    processComma();
+    processLeftParen();
+    processColonColon();
+    processArrow();
+    processDotStar();
+    processArrowStar();
+    processDoxyGenComment();
+    processAngleStringLiteral();
+    processStringLiteral();
+    processSlash();
+    processPound();
+}
+
+void ActivationSequenceProcessor::processDot()
+{
+    if (m_char3 == QLatin1Char('.') && m_char2 != QLatin1Char('.')) {
+        m_completionKind = CPlusPlus::T_DOT;
+        m_offset = 1;
+    }
+}
+
+void ActivationSequenceProcessor::processComma()
+{
+    if (m_char3 == QLatin1Char(',') ) {
+        m_completionKind = CPlusPlus::T_COMMA;
+        m_offset = 1;
+    }
+}
+
+void ActivationSequenceProcessor::processLeftParen()
+{
+    if (m_char3 == QLatin1Char('(') && m_wantFunctionCall) {
+        m_completionKind = CPlusPlus::T_LPAREN;
+        m_offset = 1;
+    }
+}
+
+void ActivationSequenceProcessor::processColonColon()
+{
+    if (m_char2 == QLatin1Char(':') && m_char3 == QLatin1Char(':')) {
+        m_completionKind = CPlusPlus::T_COLON_COLON;
+        m_offset = 2;
+    }
+}
+
+void ActivationSequenceProcessor::processArrow()
+{
+    if (m_char2 == QLatin1Char('-') && m_char3 == QLatin1Char('>')) {
+        m_completionKind = CPlusPlus::T_ARROW;
+        m_offset = 2;
+    }
+}
+
+void ActivationSequenceProcessor::processDotStar()
+{
+    if (m_char2 == QLatin1Char('.') && m_char3 == QLatin1Char('*')) {
+        m_completionKind = CPlusPlus::T_DOT_STAR;
+        m_offset = 2;
+    }
+}
+
+void ActivationSequenceProcessor::processArrowStar()
+{
+    if (m_char1 == QLatin1Char('-') && m_char2 == QLatin1Char('>') && m_char3 == QLatin1Char('*')) {
+        m_completionKind = CPlusPlus::T_ARROW_STAR;
+        m_offset = 3;
+    }
+}
+
+void ActivationSequenceProcessor::processDoxyGenComment()
+{
+    if ((m_char2 == QLatin1Char('\\') || m_char2 == QLatin1Char('@'))
+            && (m_char3.isNull() || m_char3.isSpace())) {
+        m_completionKind = CPlusPlus::T_DOXY_COMMENT;
+        m_offset = 1;
+    }
+}
+
+void ActivationSequenceProcessor::processAngleStringLiteral()
+{
+    if (m_char3 == QLatin1Char('<')) {
+        m_completionKind = CPlusPlus::T_ANGLE_STRING_LITERAL;
+        m_offset = 1;
+    }
+}
+
+void ActivationSequenceProcessor::processStringLiteral()
+{
+    if (m_char3 == QLatin1Char('"')) {
+        m_completionKind = CPlusPlus::T_STRING_LITERAL;
+        m_offset = 1;
+    }
+}
+
+void ActivationSequenceProcessor::processSlash()
+{
+    if (m_char3 == QLatin1Char('/')) {
+        m_completionKind = CPlusPlus::T_SLASH;
+        m_offset = 1;
+    }
+}
+
+void ActivationSequenceProcessor::processPound()
+{
+    if (m_char3 == QLatin1Char('#')) {
+        m_completionKind = CPlusPlus::T_POUND;
+        m_offset = 1;
+    }
+}
+
+} // namespace Internal
+} // namespace ClangCodeModel
+