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#include "qbic.h"

#include "QtCore/qfile.h"

#include "QtCore/qdebug.h"

void QBic::addBlacklistedClass(const QString &wildcard)

{

    blackList.append(QRegExp(wildcard, Qt::CaseSensitive, QRegExp::Wildcard));

}

void QBic::removeBlacklistedClass(const QString &wildcard)

{

    blackList.removeAll(QRegExp(wildcard, Qt::CaseSensitive, QRegExp::Wildcard));

}

bool QBic::isBlacklisted(const QString &className) const

{

    for (int i = 0; i < blackList.count(); ++i)

        if (blackList.at(i).exactMatch(className))

            return true;

    return false;

}

static QStringList normalizedVTable(const QStringList &entry)

{

    QStringList normalized;

    for (int i = 2; i < entry.count(); ++i) {

        const QString line = entry.at(i).simplified();

        bool isOk = false;

        int num = line.left(line.indexOf(QLatin1Char(' '))).toInt(&isOk);

        if (!isOk) {

            qWarning("unrecognized line: %s", qPrintable(line));

            continue;

        }

        QString sym = line.mid(line.indexOf(QLatin1Char(' ')) + 1);

        if (sym.startsWith(QLatin1Char('('))) {

            if (sym.endsWith(QLatin1Char(')'))) {

                sym = sym.mid(sym.lastIndexOf('(') + 1);

                sym.chop(1);

            } else {

                sym = sym.mid(sym.lastIndexOf(QLatin1Char(')')) + 1);

            }

        } else {

            sym = sym.left(sym.indexOf(QLatin1Char('(')));

        }

        if (sym.startsWith(QLatin1String("& ")))

            sym.remove(1, 1);

        if (sym.startsWith(QLatin1String("-0")) || sym.startsWith(QLatin1String("0"))) {

            if (sym.endsWith('u'))

                sym.chop(1);

            bool isOk = false;

            qint64 num = sym.toLongLong(&isOk, 16);

            if (!isOk) {

                qWarning("unrecognized token: %s", qPrintable(sym));

                continue;

            }

            if (sizeof(void*) == 4)

                sym = QString::number(int(num));

            else

                sym = QString::number(num);

        }

        normalized << QString::number(num) + QLatin1Char(' ') + sym;

    }

    return normalized;

}

QBic::Info QBic::parseOutput(const QByteArray &ba) const

{

    Info info;

    const QStringList source = QString::fromLatin1(ba).split("\n\n");

    foreach(QString str, source) {

        QStringList entry = str.split('\n');

        if (entry.count() < 2)

            continue;

        if (entry.at(0).startsWith("Class ")) {

            const QString className = entry.at(0).mid(6);

            if (isBlacklisted(className))

                continue;

            QRegExp rx("size=(\\d+)");

            if  (rx.indexIn(entry.at(1)) == -1) {

                qWarning("Could not parse class information for className %s", className.toLatin1().constData());

                continue;

            }

            info.classSizes[className] = rx.cap(1).toInt();

        } else if (entry.at(0).startsWith("Vtable for ")) {

            const QString className = entry.at(0).mid(11);

            if (isBlacklisted(className))

                continue;

            info.classVTables[className] = normalizedVTable(entry);

        }

    }

    return info;

}

QBic::Info QBic::parseFile(const QString &fileName) const

{

    QFile f(fileName);

    if (!f.open(QIODevice::ReadOnly | QIODevice::Text))

        return Info();

    QByteArray ba = f.readAll();

    f.close();

    return parseOutput(ba);

}

enum VTableDiffResult { Match, Mismatch, Reimp };

static VTableDiffResult diffVTableEntry(const QString &v1, const QString &v2)

{

    if (v1 == v2)

        return Match;

    if (v2.endsWith(QLatin1String("__cxa_pure_virtual")))

        return Reimp;

    if (!v1.contains(QLatin1String("::")) || !v2.contains(QLatin1String("::")))

        return Mismatch;

    const QString sym1 = v1.mid(v1.lastIndexOf(QLatin1String("::")) + 2);

    const QString sym2 = v2.mid(v2.lastIndexOf(QLatin1String("::")) + 2);

    if (sym1 == sym2)

        return Reimp;

    return Mismatch;

}

QBic::VTableDiff QBic::diffVTables(const Info &oldLib, const Info &newLib) const

{

    VTableDiff result;

    for (QHash<QString, QStringList>::const_iterator it = newLib.classVTables.constBegin();

            it != newLib.classVTables.constEnd(); ++it) {

        if (!oldLib.classVTables.contains(it.key())) {

            result.addedVTables.append(it.key());

            continue;

        }

        const QStringList oldVTable = oldLib.classVTables.value(it.key());

        const QStringList vTable = it.value();

        if (vTable.count() != oldVTable.count()) {

            result.modifiedVTables.append(QPair<QString, QString>(it.key(),

                        QLatin1String("size mismatch")));

            continue;

        }

        for (int i = 0; i < vTable.count(); ++i) {

            VTableDiffResult diffResult = diffVTableEntry(vTable.at(i), oldVTable.at(i));

            switch (diffResult) {

            case Match:

                // do nothing

                break;

            case Mismatch:

                result.modifiedVTables.append(QPair<QString, QString>(oldVTable.at(i),

                            vTable.at(i)));

                break;

            case Reimp:

                result.reimpMethods.append(QPair<QString, QString>(oldVTable.at(i), vTable.at(i)));

                break;

            }

        }

    }

    for (QHash<QString, QStringList>::const_iterator it = oldLib.classVTables.constBegin();

            it != oldLib.classVTables.constEnd(); ++it) {

        if (!newLib.classVTables.contains(it.key()))

            result.removedVTables.append(it.key());

    }

    return result;

}

QBic::SizeDiff QBic::diffSizes(const Info &oldLib, const Info &newLib) const

{

    QBic::SizeDiff result;

    for (QHash<QString, int>::const_iterator it = newLib.classSizes.constBegin();

            it != newLib.classSizes.constEnd(); ++it) {

        if (!oldLib.classSizes.contains(it.key())) {

            result.added.append(it.key());

            continue;

        }

        int oldSize = oldLib.classSizes.value(it.key());

        int newSize = it.value();

        if (oldSize != newSize)

            result.mismatch.append(it.key());

    }

    for (QHash<QString, int>::const_iterator it = oldLib.classSizes.constBegin();

            it != oldLib.classSizes.constEnd(); ++it) {

        if (!newLib.classSizes.contains(it.key()))

            result.removed.append(it.key());

    }

    return result;

}