cppcodeformatter.cpp

/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** Commercial Usage
**
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** 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.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
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**************************************************************************/

#include "cppcodeformatter.h"

#include <Token.h>
#include <Lexer.h>

#include <texteditor/basetextdocumentlayout.h>
#include <texteditor/tabsettings.h>

#include <QtCore/QDebug>
#include <QtCore/QMetaEnum>
#include <QtGui/QTextDocument>
#include <QtGui/QTextCursor>
#include <QtGui/QTextBlock>

using namespace CPlusPlus;
using namespace CppTools;
using namespace TextEditor;
using namespace CppTools::Internal;

CodeFormatter::BlockData::BlockData()
    : m_blockRevision(-1)
{
}

CodeFormatter::CodeFormatter()
    : m_indentDepth(0)
    , m_paddingDepth(0)
    , m_tabSize(4)
{
}

CodeFormatter::~CodeFormatter()
{
}

void CodeFormatter::setTabSize(int tabSize)
{
    m_tabSize = tabSize;
}

void CodeFormatter::recalculateStateAfter(const QTextBlock &block)
{
    restoreCurrentState(block.previous());

    bool endedJoined = false;
    const int lexerState = tokenizeBlock(block, &endedJoined);
    m_tokenIndex = 0;
    m_newStates.clear();

    if (tokenAt(0).kind() == T_POUND) {
        enter(cpp_macro_start);
        m_tokenIndex = 1;
    }

    for (; m_tokenIndex < m_tokens.size(); ) {
        m_currentToken = tokenAt(m_tokenIndex);
        const int kind = m_currentToken.kind();

        switch (m_currentState.top().type) {
        case topmost_intro:
            tryDeclaration();
            break;

        case namespace_start:
            switch (kind) {
            case T_LBRACE:      enter(namespace_open); break;
            case T_SEMICOLON:
            case T_RBRACE:      leave(); break;
            } break;

        case namespace_open:
            if (tryDeclaration())
                break;
            switch (kind) {
            case T_RBRACE:      leave(); continue; // always nested in namespace_start
            } break;

        case class_start:
            switch (kind) {
            case T_SEMICOLON:   leave(); break;
            case T_LBRACE:      enter(class_open); break;
            } break;

        case class_open:
            if (tryDeclaration())
                break;
            switch (kind) {
            case T_RBRACE:      leave(); continue; // always nested in class_start
            } break;

        case enum_start:
            switch (kind) {
            case T_SEMICOLON:   leave(); break;
            case T_LBRACE:      enter(enum_open); break;
            } break;

        case enum_open:
            switch (kind) {
            case T_RBRACE:      leave(); continue; // always nested in enum_start
            case T_LBRACE:      enter(brace_list_open); break;
            } break;

        case brace_list_open:
            switch (kind) {
            case T_RBRACE:      leave(); break;
            case T_LBRACE:      enter(brace_list_open); break;
            } break;

        case using_start:
            switch (kind) {
            case T_SEMICOLON:   leave(); break;
            } break;

        case template_start:
            switch (kind) {
            case T_LESS:        turnInto(template_param); break;
            } break;

        case template_param:
            switch (kind) {
            case T_LESS:        enter(template_param); break;
            case T_GREATER:     leave(); break;
            } break;

        case operator_declaration:
            switch (kind) {
            case T_LPAREN:      break;
            default:            leave(); break;
            } break;

        case declaration_start:
            if (tryExpression(true))
                break;
            switch (kind) {
            case T_RBRACE:      leave(true); continue;
            case T_SEMICOLON:   leave(true); break;
            case T_EQUAL:       enter(initializer); break;
            case T_LBRACE:      enter(defun_open); break;
            case T_COLON:       enter(member_init_open); enter(member_init); break;
            case T_OPERATOR:    enter(operator_declaration); break;
            } break;

        case initializer:
            switch (kind) {
            case T_LBRACE:      enter(brace_list_open); break;
            default:            turnInto(expression); continue;
            } break;

        case expression:
            if (tryExpression())
                break;
            switch (kind) {
            case T_RBRACE:      leave(true); continue;
            case T_SEMICOLON:   leave(); continue;
            case T_LBRACE:
            case T_COLON:
                if (m_currentState.at(m_currentState.size() - 2).type == declaration_start) {
                    // oops, the expression was a function declaration argument list, hand lbrace/colon to declaration_start
                    leave();
                    continue;
                }
                break;
            } break;

        case arglist_open:
            if (tryExpression())
                break;
            switch (kind) {
            case T_SEMICOLON:   leave(true); break;
            case T_RBRACE:      leave(true); continue;
            case T_RPAREN:      leave(); break;