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#include "qscriptxmlparser_p.h"

#include <QtCore/qstringlist.h>

#include <QtCore/qxmlstream.h>

#include <QtCore/qdebug.h>

QT_BEGIN_NAMESPACE

static void tokenUntil(QXmlStreamReader &reader, QXmlStreamReader::TokenType target,

                       QList<int> &lineNumbers)

{

    int level = 0;

    while (!reader.atEnd()) {

        QXmlStreamReader::TokenType t = reader.readNext();

        if ((t == target) && (level == 0))

            return;

        if (t == QXmlStreamReader::StartElement) {

            ++level;

            QString line = reader.attributes().value(QLatin1String("line")).toString();

            if (!line.isEmpty())

                lineNumbers.append(line.toInt());

        } else if (t == QXmlStreamReader::EndElement) {

            --level;

        }

    }

//    Q_ASSERT_X(false, "QScriptXmlParser", "premature end of file");

}

QScriptXmlParser::Result QScriptXmlParser::parse(const QString &xml)

{

    QMap<QString, int> functionsInfo;

    QList<int> lineNumbers;

    QXmlStreamReader reader(xml);

    reader.readNext(); // StartDocument

    reader.readNext(); // <program>

    reader.readNext(); // <source-elements>

    while (reader.readNext() == QXmlStreamReader::StartElement) {

//        qDebug() << reader.name().toString();

        int line = reader.attributes().value(QLatin1String("line")).toString().toInt();

        lineNumbers.append(line);

        if (reader.name() == QLatin1String("function-declaration")) {

            // extract the line number, name and formal parameters

            reader.readNext(); // <name>

            reader.readNext(); // Characters

            QString name = reader.text().toString();

            reader.readNext(); // </name>

            reader.readNext(); // <formal-parameter-list>

            QStringList formalParameters;

            while (reader.readNext() == QXmlStreamReader::StartElement) {

                reader.readNext(); // Characters

                formalParameters.append(reader.text().toString());

                reader.readNext(); // </identifier>

            }

            reader.readNext(); // <function-body>

            tokenUntil(reader, QXmlStreamReader::EndElement, lineNumbers);

            QString signature;

            signature.append(name);

            signature.append(QLatin1Char('('));

            for (int i = 0; i < formalParameters.size(); ++i) {

                if (i > 0)

                    signature.append(QLatin1String(", "));

                signature.append(formalParameters.at(i));

            }

            signature.append(QLatin1Char(')'));

            functionsInfo.insert(signature, line);

        } else if (reader.name() == QLatin1String("expression-statement")) {

            reader.readNext();

            if ((reader.name() == QLatin1String("binary-expression"))

                && reader.attributes().value(QLatin1String("op")) == QLatin1String("=")) {

                // try to match a statement of the form Foo.prototype.bar = function() { ... }

                // this can be generalized...

                QString first, second, third;

                reader.readNext(); // LHS

                if (reader.name() == QLatin1String("field-member-expression")) {

                    reader.readNext();

                    if (reader.name() == QLatin1String("field-member-expression")) {

                        reader.readNext();

                        if (reader.name() == QLatin1String("identifier")) {

                            reader.readNext();

                            first = reader.text().toString();

                        }

                        tokenUntil(reader, QXmlStreamReader::EndElement, lineNumbers);

                        reader.readNext();

                        if (reader.name() == QLatin1String("identifier")) {

                            reader.readNext();

                            second = reader.text().toString();

                        }

                        tokenUntil(reader, QXmlStreamReader::EndElement, lineNumbers);

                    } else if (reader.name() == QLatin1String("identifier")) {

                        reader.readNext();

                        first = reader.text().toString();

                    }

                    tokenUntil(reader, QXmlStreamReader::EndElement, lineNumbers);

                    reader.readNext();

                    if (reader.name() == QLatin1String("identifier")) {

                        reader.readNext();

                        if (second.isEmpty())

                            second = reader.text().toString();

                        else

                            third = reader.text().toString();

                    }

                    tokenUntil(reader, QXmlStreamReader::EndElement, lineNumbers);

                }

                tokenUntil(reader, QXmlStreamReader::EndElement, lineNumbers);

                reader.readNext(); // RHS

                if (reader.name() == QLatin1String("function-expression")) {

                    if (!first.isEmpty()) {

                        QString signature = first;

                        if (!second.isEmpty()) {

                            signature.append(QLatin1Char('.'));

                            signature.append(second);

                            if (!third.isEmpty()) {

                                signature.append(QLatin1Char('.'));

                                signature.append(third);

                            }

                        }

                        signature.append(QLatin1String("()"));

                        functionsInfo.insert(signature, line);

                    }

                }

                tokenUntil(reader, QXmlStreamReader::EndElement, lineNumbers);

            }

            tokenUntil(reader, QXmlStreamReader::EndElement, lineNumbers);

        }

        tokenUntil(reader, QXmlStreamReader::EndElement, lineNumbers);

    }

    reader.readNext(); // </source-elements>

    reader.readNext(); // </program>

    reader.readNext(); // EndDocument

    Q_ASSERT(reader.atEnd());

    return Result(functionsInfo, lineNumbers.toSet());

}

QT_END_NAMESPACE