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// Copyright (C) 2024 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include <qdochtmlparser_p.h>
#include <QtCore/qregularexpression.h>
QT_BEGIN_NAMESPACE
using namespace Qt::StringLiterals;
namespace { //anonymous
// An emprical value to avoid too much content
static constexpr qsizetype firstIndexOfParagraphTag = 400;
// A paragraph can start with <p><i>, or <p><tt>
// We need smallest value to use QString::indexOf
static constexpr auto lengthOfSmallestOpeningTag = qsizetype(std::char_traits<char>::length("<p><i>"));
static constexpr auto lengthOfStartParagraphTag = qsizetype(std::char_traits<char>::length("<p>"));
static constexpr auto lengthOfEndParagraphTag = qsizetype(std::char_traits<char>::length("</p>"));
static constexpr auto lengthOfPeriod = qsizetype(std::char_traits<char>::length("."));
QString getContentsByMarks(const QString &html, QString startMark, QString endMark)
{
startMark.prepend("$$$"_L1);
endMark.prepend("<!-- @@@"_L1);
QString contents;
qsizetype start = html.indexOf(startMark);
if (start != -1) {
start = html.indexOf("-->"_L1, start);
if (start != -1) {
qsizetype end = html.indexOf(endMark, start);
if (end != -1) {
start += qsizetype(std::char_traits<char>::length("-->"));
contents = html.mid(start, end - start);
}
}
}
return contents;
}
void stripAllHtml(QString *html)
{
Q_ASSERT(html);
html->remove(QRegularExpression("<.*?>"_L1));
}
/*! \internal
\brief Process the string obtained from start mark to end mark.
This is duplicated from QtC's Utils::HtmlExtractor, modified on top of it.
*/
void processOutput(QString *html)
{
Q_ASSERT(html);
if (html->isEmpty())
return;
// Do not write the first paragraph in case it has extra tags below.
// <p><i>This is only used on the Maemo platform.</i></p>
// or: <p><tt>This is used on Windows only.</tt></p>
// or: <p>[Conditional]</p>
const auto skipFirstParagraphIfNeeded = [html](qsizetype &index){
const bool shouldSkipFirstParagraph = html->indexOf(QLatin1String("<p><i>")) == index ||
html->indexOf(QLatin1String("<p><tt>")) == index ||
html->indexOf(QLatin1String("<p>[Conditional]</p>")) == index;
if (shouldSkipFirstParagraph)
index = html->indexOf(QLatin1String("<p>"), index + lengthOfSmallestOpeningTag);
};
// Try to get the entire first paragraph, but if one is not found or if its opening
// tag is not in the very beginning (using an empirical value as the limit)
// the html is cleared out to avoid too much content.
qsizetype index = html->indexOf(QLatin1String("<p>"));
if (index != -1 && index < firstIndexOfParagraphTag) {
skipFirstParagraphIfNeeded(index);
index = html->indexOf(QLatin1String("</p>"), index + lengthOfStartParagraphTag);
if (index != -1) {
// Most paragraphs end with a period, but there are cases without punctuation
// and cases like this: <p>This is a description. Example:</p>
const auto period = html->lastIndexOf(QLatin1Char('.'), index);
if (period != -1) {
html->truncate(period + lengthOfPeriod);
html->append(QLatin1String("</p>"));
} else {
html->truncate(index + lengthOfEndParagraphTag);
}
} else {
html->clear();
}
} else {
html->clear();
}
}
}
QDocHtmlExtractor::QDocHtmlExtractor(const QString &code) : m_code{ code }
{
}
QString QDocHtmlExtractor::extract(const QDocHtmlExtractor::Element &element, ExtractionMode mode)
{
QString result;
switch (element.type) {
case ElementType::QmlType:
result = parseForQmlType(element.name, mode);
break;
case ElementType::QmlProperty:
result = parseForQmlProperty(element.name, mode);
break;
case ElementType::QmlMethod:
case ElementType::QmlSignal:
result = parseForQmlMethodOrSignal(element.name, mode);
break;
default:
return {};
}
stripAllHtml(&result);
// Also remove leading and trailing whitespaces
return result.trimmed();
}
QString QDocHtmlExtractor::parseForQmlType(const QString &element, ExtractionMode mode)
{
QString result;
// Get brief description
if (mode == QDocHtmlExtractor::ExtractionMode::Simplified) {
result = getContentsByMarks(m_code, element + "-brief"_L1 , element);
// Remove More...
if (!result.isEmpty()) {
const auto tailToRemove = "More..."_L1;
const auto lastIndex = result.lastIndexOf(tailToRemove);
if (lastIndex != -1)
result.remove(lastIndex, tailToRemove.length());
}
} else {
result = getContentsByMarks(m_code, element + "-description"_L1, element);
// Remove header
if (!result.isEmpty()) {
const auto headerToRemove = "Detailed Description"_L1;
const auto firstIndex = result.indexOf(headerToRemove);
if (firstIndex != -1)
result.remove(firstIndex, headerToRemove.length());
}
}
return result;
}
QString QDocHtmlExtractor::parseForQmlProperty(const QString &element, ExtractionMode mode)
{
// Qt 5.15 way of finding properties in doc
QString startMark = QString::fromLatin1("<a name=\"%1-prop\">").arg(element);
qsizetype startIndex = m_code.indexOf(startMark);
if (startIndex == -1) {
// if not found, try Qt6
startMark = QString::fromLatin1(
"<td class=\"tblQmlPropNode\"><p>\n<span class=\"name\">%1</span>")
.arg(element);
startIndex = m_code.indexOf(startMark);
if (startIndex == -1)
return {};
}
QString contents = m_code.mid(startIndex + startMark.size());
startIndex = contents.indexOf(QLatin1String("<div class=\"qmldoc\"><p>"));
if (startIndex == -1)
return {};
contents = contents.mid(startIndex);
if (mode == ExtractionMode::Simplified)
processOutput(&contents);
return contents;
}
QString QDocHtmlExtractor::parseForQmlMethodOrSignal(const QString &functionName, ExtractionMode mode)
{
// the case with <!-- $$$childAt[overload1]$$$childAtrealreal -->
QString mark = QString::fromLatin1("$$$%1[overload1]$$$%1").arg(functionName);
qsizetype startIndex = m_code.indexOf(mark);
if (startIndex != -1) {
startIndex = m_code.indexOf("-->"_L1, startIndex + mark.length());
if (startIndex == -1)
return {};
} else {
// it could be part of the method list
mark = QString::fromLatin1("<span class=\"name\">%1</span>")
.arg(functionName);
startIndex = m_code.indexOf(mark);
if (startIndex != -1)
startIndex += mark.length();
else
return {};
}
startIndex = m_code.indexOf(QLatin1String("<div class=\"qmldoc\"><p>"), startIndex);
if (startIndex == -1)
return {};
QString endMark = QString::fromLatin1("<!-- @@@");
qsizetype endIndex = m_code.indexOf(endMark, startIndex);
QString contents = m_code.mid(startIndex, endIndex);
if (mode == ExtractionMode::Simplified)
processOutput(&contents);
return contents;
}
QT_END_NAMESPACE
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