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#include "csshighlighter_p.h"

QT_BEGIN_NAMESPACE

namespace qdesigner_internal {

CssHighlighter::CssHighlighter(QTextDocument *document)

: QSyntaxHighlighter(document)

{

}

void CssHighlighter::highlightBlock(const QString& text)

{

    enum Token { ALNUM, LBRACE, RBRACE, COLON, SEMICOLON, COMMA, QUOTE, SLASH, STAR };

    static const int transitions[10][9] = {

        { Selector, Property, Selector, Pseudo,    Property, Selector, Quote, MaybeComment, Selector }, // Selector

        { Property, Property, Selector, Value,     Property, Property, Quote, MaybeComment, Property }, // Property

        { Value,    Property, Selector, Value,     Property, Value,    Quote, MaybeComment, Value }, // Value

        { Pseudo1, Property, Selector, Pseudo2,    Selector, Selector, Quote, MaybeComment, Pseudo }, // Pseudo

        { Pseudo1, Property, Selector, Pseudo,    Selector, Selector, Quote, MaybeComment, Pseudo1 }, // Pseudo1

        { Pseudo2, Property, Selector, Pseudo,    Selector, Selector, Quote, MaybeComment, Pseudo2 }, // Pseudo2

        { Quote,    Quote,    Quote,    Quote,     Quote,    Quote,   -1, Quote, Quote }, // Quote

        { -1, -1, -1, -1, -1, -1, -1, -1, Comment }, // MaybeComment

        { Comment, Comment, Comment, Comment, Comment, Comment, Comment, Comment, MaybeCommentEnd }, // Comment

        { Comment, Comment, Comment, Comment, Comment, Comment, Comment, -1, MaybeCommentEnd } // MaybeCommentEnd

    };

    int lastIndex = 0;

    bool lastWasSlash = false;

    int state = previousBlockState(), save_state;

    if (state == -1) {

        // As long as the text is empty, leave the state undetermined

        if (text.isEmpty()) {

            setCurrentBlockState(-1);

            return;

        }

        // The initial state is based on the precense of a : and the absense of a {.

        // This is because Qt style sheets support both a full stylesheet as well as

        // an inline form with just properties.

        state = save_state = (text.indexOf(QLatin1Char(':')) > -1 &&

                              text.indexOf(QLatin1Char('{')) == -1) ? Property : Selector;

    } else {

        save_state = state>>16;

        state &= 0x00ff;

    }

    if (state == MaybeCommentEnd) {

        state = Comment;

    } else if (state == MaybeComment) {

        state = save_state;

    }

    for (int i = 0; i < text.length(); i++) {

        int token = ALNUM;

        const QChar c = text.at(i);

        const char a = c.toAscii();

        if (state == Quote) {

            if (a == '\\') {

                lastWasSlash = true;

            } else {

                if (a == '\"' && !lastWasSlash) {

                    token = QUOTE;

                }

                lastWasSlash = false;

            }

        } else {

            switch (a) {

            case '{': token = LBRACE; break;

            case '}': token = RBRACE; break;

            case ':': token = COLON; break;

            case ';': token = SEMICOLON; break;

            case ',': token = COMMA; break;

            case '\"': token = QUOTE; break;

            case '/': token = SLASH; break;

            case '*': token = STAR; break;

            default: break;

            }

        }

        int new_state = transitions[state][token];

        if (new_state != state) {

            bool include_token = new_state == MaybeCommentEnd || (state == MaybeCommentEnd && new_state!= Comment)

                                 || state == Quote;

            highlight(text, lastIndex, i-lastIndex+include_token, state);

            if (new_state == Comment) {

                lastIndex = i-1; // include the slash and star

            } else {

                lastIndex = i + ((token == ALNUM || new_state == Quote) ? 0 : 1);

            }

        }

        if (new_state == -1) {

            state = save_state;

        } else if (state <= Pseudo2) {

            save_state = state;

            state = new_state;

        } else {

            state = new_state;

        }

    }

    highlight(text, lastIndex, text.length() - lastIndex, state);

    setCurrentBlockState(state + (save_state<<16));

}

void CssHighlighter::highlight(const QString &text, int start, int length, int state)

{

    if (start >= text.length() || length <= 0)

        return;

    QTextCharFormat format;

    switch (state) {

    case Selector:

        setFormat(start, length, Qt::darkRed);

        break;

    case Property:

        setFormat(start, length, Qt::blue);

        break;

    case Value:

        setFormat(start, length, Qt::black);

        break;

    case Pseudo1:

        setFormat(start, length, Qt::darkRed);

        break;

    case Pseudo2:

        setFormat(start, length, Qt::darkRed);

        break;

    case Quote:

        setFormat(start, length, Qt::darkMagenta);

        break;

    case Comment:

    case MaybeCommentEnd:

        format.setForeground(Qt::darkGreen);

        setFormat(start, length, format);

        break;

    default:

        break;

    }

}

} // namespace qdesigner_internal

QT_END_NAMESPACE