1 files changed, 214 insertions, 0 deletions
diff --git a/src/qmlls/qdochtmlparser.cpp b/src/qmlls/qdochtmlparser.cpp
new file mode 100644
index 0000000000..bba18facb5
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+++ b/src/qmlls/qdochtmlparser.cpp
@@ -0,0 +1,214 @@
+// 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