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/*
  codeparser.cpp
*/

#include "codeparser.h"

#include "config.h"
#include "generator.h"
#include "node.h"
#include "proxynode.h"
#include "qdocdatabase.h"

#include <QtCore/qregularexpression.h>

QT_BEGIN_NAMESPACE

QList<CodeParser *> CodeParser::parsers;
bool CodeParser::showInternal_ = false;
bool CodeParser::singleExec_ = false;

/*!
  The constructor adds this code parser to the static
  list of code parsers.
 */
CodeParser::CodeParser()
{
    qdb_ = QDocDatabase::qdocDB();
    parsers.prepend(this);
}

/*!
  The destructor removes this code parser from the static
  list of code parsers.
 */
CodeParser::~CodeParser()
{
    parsers.removeAll(this);
}

/*!
  Initialize the code parser base class.
 */
void CodeParser::initializeParser()
{
    showInternal_ = Config::instance().showInternal();
    singleExec_ = Config::instance().getBool(CONFIG_SINGLEEXEC);
}

/*!
  Terminating a code parser is trivial.
 */
void CodeParser::terminateParser()
{
    // nothing.
}

QStringList CodeParser::headerFileNameFilter()
{
    return sourceFileNameFilter();
}

void CodeParser::parseHeaderFile(const Location &location, const QString &filePath)
{
    parseSourceFile(location, filePath);
}

/*!
  All the code parsers in the static list are initialized here,
  after the qdoc configuration variables have been set.
 */
void CodeParser::initialize()
{
    for (const auto &parser : qAsConst(parsers))
        parser->initializeParser();
}

/*!
  All the code parsers in the static list are terminated here.
 */
void CodeParser::terminate()
{
    for (const auto parser : parsers)
        parser->terminateParser();
}

CodeParser *CodeParser::parserForLanguage(const QString &language)
{
    for (const auto parser : qAsConst(parsers)) {
        if (parser->language() == language)
            return parser;
    }
    return nullptr;
}

CodeParser *CodeParser::parserForHeaderFile(const QString &filePath)
{
    QString fileName = QFileInfo(filePath).fileName();

    for (const auto &parser : qAsConst(parsers)) {
        const QStringList headerPatterns = parser->headerFileNameFilter();
        for (const auto &pattern : headerPatterns) {
            auto re = QRegularExpression::fromWildcard(pattern, Qt::CaseInsensitive);
            if (re.match(fileName).hasMatch())
                return parser;
        }
    }
    return nullptr;
}

CodeParser *CodeParser::parserForSourceFile(const QString &filePath)
{
    QString fileName = QFileInfo(filePath).fileName();

    for (const auto &parser : parsers) {
        const QStringList sourcePatterns = parser->sourceFileNameFilter();
        for (const QString &pattern : sourcePatterns) {
            auto re = QRegularExpression::fromWildcard(pattern, Qt::CaseInsensitive);
            if (re.match(fileName).hasMatch())
                return parser;
        }
    }
    return nullptr;
}

static QSet<QString> commonMetaCommands_;
/*!
  Returns the set of strings representing the common metacommands.
 */
const QSet<QString> &CodeParser::commonMetaCommands()
{
    if (commonMetaCommands_.isEmpty()) {
        commonMetaCommands_ << COMMAND_ABSTRACT << COMMAND_DEPRECATED << COMMAND_INGROUP
                            << COMMAND_INJSMODULE << COMMAND_INMODULE << COMMAND_INPUBLICGROUP
                            << COMMAND_INQMLMODULE << COMMAND_INTERNAL << COMMAND_NOAUTOLIST
                            << COMMAND_NONREENTRANT << COMMAND_OBSOLETE << COMMAND_PRELIMINARY
                            << COMMAND_QMLABSTRACT << COMMAND_QMLDEFAULT << COMMAND_QMLINHERITS
                            << COMMAND_QMLREADONLY << COMMAND_QMLREQUIRED << COMMAND_QTCMAKEPACKAGE
                            << COMMAND_QTVARIABLE << COMMAND_REENTRANT << COMMAND_SINCE
                            << COMMAND_STARTPAGE  << COMMAND_SUBTITLE << COMMAND_THREADSAFE
                            << COMMAND_TITLE << COMMAND_WRAPPER;
    }
    return commonMetaCommands_;
}

/*!
  \internal
 */
void CodeParser::extractPageLinkAndDesc(QStringView arg, QString *link, QString *desc)
{
    QRegularExpression bracedRegExp(QRegularExpression::anchoredPattern(QLatin1String("\\{([^{}]*)\\}(?:\\{([^{}]*)\\})?")));
    auto match = bracedRegExp.match(arg);
    if (match.hasMatch()) {
        *link = match.captured(1);
        *desc = match.captured(2);
        if (desc->isEmpty())
            *desc = *link;
    } else {
        int spaceAt = arg.indexOf(QLatin1Char(' '));
        if (arg.contains(QLatin1String(".html")) && spaceAt != -1) {
            *link = arg.left(spaceAt).trimmed().toString();
            *desc = arg.mid(spaceAt).trimmed().toString();
        } else {
            *link = arg.toString();
            *desc = *link;
        }
    }
}

/*!
  \internal
 */
void CodeParser::setLink(Node *node, Node::LinkType linkType, const QString &arg)
{
    QString link;
    QString desc;
    extractPageLinkAndDesc(arg, &link, &desc);
    node->setLink(linkType, link, desc);
}

/*!
  \brief Test for whether a doc comment warrants warnings.

  Returns true if qdoc should report that it has found something
  wrong with the qdoc comment in \a doc. Sometimes, qdoc should
  not report the warning, for example, when the comment contains
  the \c internal command, which normally means qdoc will not use
  the comment in the documentation anyway, so there is no point
  in reporting warnings about it.
 */
bool CodeParser::isWorthWarningAbout(const Doc &doc)
{
    return (showInternal_ || !doc.metaCommandsUsed().contains(QStringLiteral("internal")));
}

/*!
  Returns \c true if the file being parsed is a .h file.
 */
bool CodeParser::isParsingH() const
{
    return currentFile_.endsWith(".h");
}

/*!
  Returns \c true if the file being parsed is a .cpp file.
 */
bool CodeParser::isParsingCpp() const
{
    return currentFile_.endsWith(".cpp");
}

/*!
  Returns \c true if the file being parsed is a .qdoc file.
 */
bool CodeParser::isParsingQdoc() const
{
    return currentFile_.endsWith(".qdoc");
}

/*!
  For each node that will produce a documentation page, this function
  ensures that the node belongs to a module. Normally, the qdoc comment
  for an entity that will produce a documentation page will contain an
  \inmodule command to tell qdoc which module the entity belongs to.

  But now we normally run qdoc on each module in two passes. The first
  produces an index file; the second pass generates the docs after
  reading all the index files it needs.

  This means that all the pages generated during each pass 2 run of
  qdoc almost certainly belong to a single module, and the name of
  that module is, as a rule, used as the project name in the qdocconf
  file used when running qdoc on the module.

  So this function first asks if the node \a n has a non-empty module
  name. If it it does not have a non-empty module name, it sets the
  module name to be the project name.

  In some cases it prints a qdoc warning that it has done this. Namely,
  for C++ classes and namespaces.
 */
void CodeParser::checkModuleInclusion(Node *n)
{
    if (n->physicalModuleName().isEmpty()) {
        n->setPhysicalModuleName(Generator::defaultModuleName());

        if (n->isInAPI() && !n->name().isEmpty()) {
            QString word;
            switch (n->nodeType()) {
            case Node::Class:
                word = QLatin1String("Class");
                break;
            case Node::Struct:
                word = QLatin1String("Struct");
                break;
            case Node::Union:
                word = QLatin1String("Union");
                break;
            case Node::Namespace:
                word = QLatin1String("Namespace");
                break;
            default:
                return;
            }

            qdb_->addToModule(Generator::defaultModuleName(), n);
            n->doc().location().warning(QStringLiteral("%1 %2 has no \\inmodule command; "
                                                       "using project name by default: %3")
                                                .arg(word)
                                                .arg(n->name())
                                                .arg(Generator::defaultModuleName()));
        }
    }
}

QT_END_NAMESPACE
