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#include <qfileinfo.h>

#include <qregexp.h>

#include <qdebug.h>

#include "quoter.h"

QT_BEGIN_NAMESPACE

static void replaceMultipleNewlines(QString &s)

{

    const int n = s.size();

    bool slurping = false;

    int j = -1;

    const QChar newLine = QLatin1Char('\n');

    QChar *d = s.data();

    for (int i = 0; i != n; ++i) {

        const QChar c = d[i];

        bool hit = (c == newLine);

        if (slurping && hit)

            continue;

        d[++j] = c;

        slurping = hit;

    }

    s.resize(++j);

}

// This is equivalent to  line.split( QRegExp("\n(?!\n|$)") ) but much faster

static QStringList splitLines(const QString &line)

{

    QStringList result;

    int i = line.size();

    while (true) {

        int j = i - 1;

        while (j >= 0 && line.at(j) == QLatin1Char('\n'))

            --j; 

        while (j >= 0 && line.at(j) != QLatin1Char('\n'))

            --j; 

        result.prepend(line.mid(j + 1, i - j - 1));

        if (j < 0)

            break;

        i = j;

    }

    return result;

}

/*

  Transforms 'int x = 3 + 4' into 'int x=3+4'. A white space is kept

  between 'int' and 'x' because it is meaningful in C++.

*/

static void trimWhiteSpace( QString& str )

{

    enum { Normal, MetAlnum, MetSpace } state = Normal;

    const int n = str.length();

    int j = -1;

    QChar *d = str.data();

    for ( int i = 0; i != n; ++i ) {

        const QChar c = d[i];

        if ( c.isLetterOrNumber() ) {

            if ( state == Normal ) {

                state = MetAlnum;

            } else {

                if ( state == MetSpace )

                    str[++j] = c;

                state = Normal;

            }

            str[++j] = c;

        } else if ( c.isSpace() ) {

            if ( state == MetAlnum )

                state = MetSpace;

        } else {

            state = Normal;

            str[++j] = c;

        }

    }

    str.resize(++j);

}

Quoter::Quoter()

    : silent( false )

{

    /* We're going to hard code these delimiters:

        * C++, Qt, Qt Script, Java:

          //! [<id>]

        * .pro files:

          #! [<id>]

        * .xq, .xml, .html files:

          <!-- [<id>] -->

    */

    commentHash["pro"] = "#!";

    commentHash["py"] = "#!";

    commentHash["html"] = "<!--";

    commentHash["qrc"] = "<!--";

    commentHash["ui"] = "<!--";

    commentHash["xml"] = "<!--";

    commentHash["xq"] = "<!--";

}

void Quoter::reset()

{

    silent = false;

    plainLines.clear();

    markedLines.clear();

    codeLocation = Location::null;

}

void Quoter::quoteFromFile( const QString& userFriendlyFilePath,

			    const QString& plainCode,

			    const QString& markedCode )

{

    silent = false;

    /*

      Split the source code into logical lines. Empty lines are

      treated specially. Before:

	  p->alpha();

	  p->beta();

	  p->gamma();

	  p->delta();

      After:

	  p->alpha();

	  p->beta();\n

	  p->gamma();\n\n

	  p->delta();

      Newlines are preserved because they affect codeLocation.

    */

    codeLocation = Location( userFriendlyFilePath );

    plainLines = splitLines(plainCode);

    markedLines = splitLines(markedCode);

    if (markedLines.count() != plainLines.count()) {

        codeLocation.warning(tr("Something is wrong with qdoc's handling of marked code"));

        markedLines = plainLines;

    }

    /*

      Squeeze blanks (cat -s).

    */

    QStringList::Iterator m = markedLines.begin();

    while ( m != markedLines.end() ) {

        replaceMultipleNewlines( *m );

        ++m;

    }

    codeLocation.start();

}

QString Quoter::quoteLine( const Location& docLocation, const QString& command,

    const QString& pattern )

{

    if ( plainLines.isEmpty() ) {

        failedAtEnd( docLocation, command );

        return QString();

    }

    if ( pattern.isEmpty() ) {

        docLocation.warning( tr("Missing pattern after '\\%1'").arg(command) );

        return QString();

    }

    if ( match(docLocation, pattern, plainLines.first()) )

        return getLine();

    if ( !silent ) {

        docLocation.warning( tr("Command '\\%1' failed").arg(command) );

        codeLocation.warning( tr("Pattern '%1' didn't match here")

                  .arg(pattern) );

        silent = true;

    }

    return QString();

}

QString Quoter::quoteSnippet(const Location &docLocation, const QString &identifier)

{

    QString comment = commentForCode();

    QString delimiter = comment + QString(" [%1]").arg(identifier);

    QString t;

    while (!plainLines.isEmpty()) {

        if (match(docLocation, delimiter, plainLines.first())) {

            getLine();

            break;

        }

        getLine();

    }

    while (!plainLines.isEmpty()) {

        QString line = plainLines.first();

        if (match(docLocation, delimiter, line)) {

            QString lastLine = getLine();

            int dIndex = lastLine.indexOf(delimiter);

            if (dIndex > 0) {

                QString leading = lastLine.left(dIndex);

                dIndex = leading.indexOf(comment);

                if (dIndex != -1)

                    leading = leading.left(dIndex);

                if (!leading.trimmed().isEmpty())

                    t += leading;

            }

            return t;

        }

        // Remove special macros to support Qt namespacing.

	if (line.startsWith("QT_BEGIN_NAMESPACE")) {

            getLine();

        } else if (line.startsWith("QT_END_NAMESPACE")) {

            getLine();

            t += QLatin1Char('\n');

        } else if (!line.startsWith(comment)) {

            // Ordinary code

            t += getLine();

        } else {

            // Normal comments

            if (line.contains(QLatin1Char('\n')))

                t += QLatin1Char('\n');

            getLine();

        }

    }

    failedAtEnd(docLocation, QString("snippet (%1)").arg(delimiter));

    return t;

}

QString Quoter::quoteTo( const Location& docLocation, const QString& command,

			 const QString& pattern )

{

    QString t;

    QString comment = commentForCode();

    if ( pattern.isEmpty() ) {

        while ( !plainLines.isEmpty() ) {

            QString line = plainLines.first();

            // Remove special macros to support Qt namespacing.

	    if (line.startsWith("QT_BEGIN_NAMESPACE")) {

                getLine();

            } else if (line.startsWith("QT_END_NAMESPACE")) {

                getLine();

                t += QLatin1Char('\n');

            } else if (!line.startsWith(comment))

                // Ordinary code

                t += getLine();

            else {

                // Normal comments

                if (line.contains(QLatin1Char('\n')))

                    t += QLatin1Char('\n');

                getLine();

            }

        }

    } else {

        while ( !plainLines.isEmpty() ) {

            if ( match(docLocation, pattern, plainLines.first()) ) {

                return t;

            }

            t += getLine();

        }

        failedAtEnd( docLocation, command );

    }

    return t;

}

QString Quoter::quoteUntil( const Location& docLocation, const QString& command,

			    const QString& pattern )

{

    QString t = quoteTo( docLocation, command, pattern );

    t += getLine();

    return t;

}

QString Quoter::getLine()

{

    if ( plainLines.isEmpty() )

        return QString();

    plainLines.removeFirst();

    QString t = markedLines.takeFirst();

    t += QLatin1Char('\n');

    codeLocation.advanceLines( t.count( QLatin1Char('\n') ) );

    return t;

}

bool Quoter::match( const Location& docLocation, const QString& pattern0,

                    const QString& line )

{

    QString str = line;

    while ( str.endsWith(QLatin1Char('\n')) )

        str.truncate( str.length() - 1 );

    QString pattern = pattern0;

    if ( pattern.startsWith(QLatin1Char('/'))

        && pattern.endsWith(QLatin1Char('/'))

        && pattern.length() > 2 ) {

        QRegExp rx( pattern.mid(1, pattern.length() - 2) );

        if ( !silent && !rx.isValid() ) {

            docLocation.warning( tr("Invalid regular expression '%1'")

                                 .arg(rx.pattern()) );

            silent = true;

        }

        return str.indexOf( rx ) != -1;

    }

    trimWhiteSpace(str);

    trimWhiteSpace(pattern);

    return str.indexOf(pattern) != -1;

}

void Quoter::failedAtEnd( const Location& docLocation, const QString& command )

{

    if (!silent && !command.isEmpty()) {

	if ( codeLocation.filePath().isEmpty() ) {

	    docLocation.warning( tr("Unexpected '\\%1'").arg(command) );

	} else {

	    docLocation.warning( tr("Command '\\%1' failed at end of file '%2'")

				 .arg(command).arg(codeLocation.filePath()) );

	}

	silent = true;

    }

}

QString Quoter::commentForCode() const

{

    QString suffix = QFileInfo(codeLocation.fileName()).suffix();

    return commentHash.value(suffix, "//!");

}

QT_END_NAMESPACE