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markdownhighlighter.cpp
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markdownhighlighter.cpp
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/*
* MIT License
*
* Copyright (c) 2014-2024 Patrizio Bekerle -- <[email protected]>
* Copyright (c) 2019-2021 Waqar Ahmed -- <[email protected]>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* QPlainTextEdit Markdown highlighter
*/
#include "markdownhighlighter.h"
#include <QDebug>
#include <QRegularExpression>
#include <QRegularExpressionMatch>
#include <QRegularExpressionMatchIterator>
#include <QTextDocument>
#include <QTimer>
#include <utility>
#include "qownlanguagedata.h"
// We enable QStringView with Qt 5.15.14
// Note: QStringView::mid wasn't working correctly at least with 5.15.2
// and 5.15.3, but 5.15.14 was fine
#if QT_VERSION < QT_VERSION_CHECK(5, 15, 14)
#define MH_SUBSTR(pos, len) text.midRef(pos, len)
#else
#define MH_SUBSTR(pos, len) QStringView(text).mid(pos, len)
#endif
QHash<QString, MarkdownHighlighter::HighlighterState>
MarkdownHighlighter::_langStringToEnum;
QHash<MarkdownHighlighter::HighlighterState, QTextCharFormat>
MarkdownHighlighter::_formats;
QVector<MarkdownHighlighter::HighlightingRule>
MarkdownHighlighter::_highlightingRules;
/**
* Markdown syntax highlighting
* @param parent
* @return
*/
MarkdownHighlighter::MarkdownHighlighter(
QTextDocument *parent, HighlightingOptions highlightingOptions)
: QSyntaxHighlighter(parent), _highlightingOptions(highlightingOptions) {
// _highlightingOptions = highlightingOptions;
_timer = new QTimer(this);
connect(_timer, &QTimer::timeout, this, &MarkdownHighlighter::timerTick);
_timer->start(1000);
// initialize the highlighting rules
initHighlightingRules();
// initialize the text formats
initTextFormats();
// initialize code languages
initCodeLangs();
}
/**
* Does jobs every second
*/
void MarkdownHighlighter::timerTick() {
// re-highlight all dirty blocks
reHighlightDirtyBlocks();
// emit a signal every second if there was some highlighting done
if (_highlightingFinished) {
_highlightingFinished = false;
Q_EMIT highlightingFinished();
}
}
/**
* Re-highlights all dirty blocks
*/
void MarkdownHighlighter::reHighlightDirtyBlocks() {
while (_dirtyTextBlocks.count() > 0) {
QTextBlock block = _dirtyTextBlocks.at(0);
rehighlightBlock(block);
_dirtyTextBlocks.removeFirst();
}
}
/**
* Clears the dirty blocks vector
*/
void MarkdownHighlighter::clearDirtyBlocks() {
_ranges.clear();
_dirtyTextBlocks.clear();
}
/**
* Adds a dirty block to the list if it doesn't already exist
*
* @param block
*/
void MarkdownHighlighter::addDirtyBlock(const QTextBlock &block) {
if (!_dirtyTextBlocks.contains(block)) {
_dirtyTextBlocks.append(block);
}
}
/**
* Initializes the highlighting rules
*
* regexp tester:
* https://regex101.com
*
* other examples:
* /usr/share/kde4/apps/katepart/syntax/markdown.xml
*/
void MarkdownHighlighter::initHighlightingRules() {
// highlight block quotes
{
HighlightingRule rule(HighlighterState::BlockQuote);
rule.pattern = QRegularExpression(
_highlightingOptions.testFlag(
HighlightingOption::FullyHighlightedBlockQuote)
? QStringLiteral("^\\s*(>\\s*.+)")
: QStringLiteral("^\\s*(>\\s*)+"));
rule.shouldContain = QStringLiteral("> ");
_highlightingRules.append(rule);
}
// highlight tables without starting |
// we drop that for now, it's far too messy to deal with
// rule = HighlightingRule();
// rule.pattern = QRegularExpression("^.+? \\| .+? \\| .+$");
// rule.state = HighlighterState::Table;
// _highlightingRulesPre.append(rule);
// highlight trailing spaces
{
HighlightingRule rule(HighlighterState::TrailingSpace);
rule.pattern = QRegularExpression(QStringLiteral("( +)$"));
rule.shouldContain = QStringLiteral(" ");
rule.capturingGroup = 1;
_highlightingRules.append(rule);
}
// highlight inline comments
{
// highlight comments for R Markdown for academic papers
HighlightingRule rule(HighlighterState::Comment);
rule.pattern =
QRegularExpression(QStringLiteral(R"(^\[.+?\]: # \(.+?\)$)"));
rule.shouldContain = QStringLiteral("]: # (");
_highlightingRules.append(rule);
}
// highlight tables with starting |
{
HighlightingRule rule(HighlighterState::Table);
rule.shouldContain = QStringLiteral("|");
rule.pattern = QRegularExpression(QStringLiteral("^\\|.+?\\|$"));
_highlightingRules.append(rule);
}
}
/**
* Initializes the text formats
*
* @param defaultFontSize
*/
void MarkdownHighlighter::initTextFormats(int defaultFontSize) {
QTextCharFormat format;
// set character formats for headlines
format = QTextCharFormat();
format.setForeground(QColor(2, 69, 150));
format.setFontWeight(QFont::Bold);
format.setFontPointSize(defaultFontSize * 1.6);
_formats[H1] = format;
format.setFontPointSize(defaultFontSize * 1.5);
_formats[H2] = format;
format.setFontPointSize(defaultFontSize * 1.4);
_formats[H3] = format;
format.setFontPointSize(defaultFontSize * 1.3);
_formats[H4] = format;
format.setFontPointSize(defaultFontSize * 1.2);
_formats[H5] = format;
format.setFontPointSize(defaultFontSize * 1.1);
_formats[H6] = format;
format.setFontPointSize(defaultFontSize);
// set character format for horizontal rulers
format = QTextCharFormat();
format.setForeground(Qt::darkGray);
format.setBackground(Qt::lightGray);
_formats[HorizontalRuler] = std::move(format);
// set character format for lists
format = QTextCharFormat();
format.setForeground(QColor(163, 0, 123));
_formats[List] = format;
// set character format for checkbox
format = QTextCharFormat();
format.setForeground(QColor(123, 100, 223));
_formats[CheckBoxUnChecked] = std::move(format);
// set character format for checked checkbox
format = QTextCharFormat();
format.setForeground(QColor(223, 50, 123));
_formats[CheckBoxChecked] = std::move(format);
// set character format for links
format = QTextCharFormat();
format.setForeground(QColor(0, 128, 255));
format.setFontUnderline(true);
_formats[Link] = std::move(format);
// set character format for images
format = QTextCharFormat();
format.setForeground(QColor(0, 191, 0));
format.setBackground(QColor(228, 255, 228));
_formats[Image] = std::move(format);
// set character format for code blocks
format = QTextCharFormat();
format.setFont(QFontDatabase::systemFont(QFontDatabase::FixedFont));
// format.setBackground(QColor(220, 220, 220));
_formats[CodeBlock] = format;
_formats[InlineCodeBlock] = format;
// set character format for italic
format = QTextCharFormat();
format.setFontWeight(QFont::StyleItalic);
format.setFontItalic(true);
_formats[Italic] = std::move(format);
// set character format for underline
format = QTextCharFormat();
format.setFontUnderline(true);
_formats[StUnderline] = std::move(format);
// set character format for bold
format = QTextCharFormat();
format.setFontWeight(QFont::Bold);
_formats[Bold] = std::move(format);
// set character format for comments
format = QTextCharFormat();
format.setForeground(QBrush(Qt::gray));
_formats[Comment] = std::move(format);
// set character format for masked syntax
format = QTextCharFormat();
format.setForeground(QColor(204, 204, 204));
_formats[MaskedSyntax] = std::move(format);
// set character format for tables
format = QTextCharFormat();
format.setFont(QFontDatabase::systemFont(QFontDatabase::FixedFont));
format.setForeground(QColor(100, 148, 73));
_formats[Table] = std::move(format);
// set character format for block quotes
format = QTextCharFormat();
format.setForeground(Qt::darkRed);
_formats[BlockQuote] = std::move(format);
format = QTextCharFormat();
_formats[HeadlineEnd] = std::move(format);
_formats[NoState] = std::move(format);
// set character format for trailing spaces
format.setBackground(QColor(252, 175, 62));
_formats[TrailingSpace] = std::move(format);
/****************************************
* Formats for syntax highlighting
***************************************/
format = QTextCharFormat();
format.setFont(QFontDatabase::systemFont(QFontDatabase::FixedFont));
format.setForeground(QColor(249, 38, 114));
_formats[CodeKeyWord] = std::move(format);
format = QTextCharFormat();
format.setFont(QFontDatabase::systemFont(QFontDatabase::FixedFont));
format.setForeground(QColor(163, 155, 78));
_formats[CodeString] = std::move(format);
format = QTextCharFormat();
format.setFont(QFontDatabase::systemFont(QFontDatabase::FixedFont));
format.setForeground(QColor(117, 113, 94));
_formats[CodeComment] = std::move(format);
format = QTextCharFormat();
format.setFont(QFontDatabase::systemFont(QFontDatabase::FixedFont));
format.setForeground(QColor(84, 174, 191));
_formats[CodeType] = std::move(format);
format = QTextCharFormat();
format.setFont(QFontDatabase::systemFont(QFontDatabase::FixedFont));
format.setForeground(QColor(219, 135, 68));
_formats[CodeOther] = std::move(format);
format = QTextCharFormat();
format.setFont(QFontDatabase::systemFont(QFontDatabase::FixedFont));
format.setForeground(QColor(174, 129, 255));
_formats[CodeNumLiteral] = std::move(format);
format = QTextCharFormat();
format.setFont(QFontDatabase::systemFont(QFontDatabase::FixedFont));
format.setForeground(QColor(1, 138, 15));
_formats[CodeBuiltIn] = std::move(format);
}
/**
* @brief initializes the langStringToEnum
*/
void MarkdownHighlighter::initCodeLangs() {
MarkdownHighlighter::_langStringToEnum =
QHash<QString, MarkdownHighlighter::HighlighterState>{
{QLatin1String("bash"), MarkdownHighlighter::CodeBash},
{QLatin1String("c"), MarkdownHighlighter::CodeC},
{QLatin1String("cpp"), MarkdownHighlighter::CodeCpp},
{QLatin1String("cxx"), MarkdownHighlighter::CodeCpp},
{QLatin1String("c++"), MarkdownHighlighter::CodeCpp},
{QLatin1String("c#"), MarkdownHighlighter::CodeCSharp},
{QLatin1String("cmake"), MarkdownHighlighter::CodeCMake},
{QLatin1String("csharp"), MarkdownHighlighter::CodeCSharp},
{QLatin1String("css"), MarkdownHighlighter::CodeCSS},
{QLatin1String("go"), MarkdownHighlighter::CodeGo},
{QLatin1String("html"), MarkdownHighlighter::CodeXML},
{QLatin1String("ini"), MarkdownHighlighter::CodeINI},
{QLatin1String("java"), MarkdownHighlighter::CodeJava},
{QLatin1String("javascript"), MarkdownHighlighter::CodeJava},
{QLatin1String("js"), MarkdownHighlighter::CodeJs},
{QLatin1String("json"), MarkdownHighlighter::CodeJSON},
{QLatin1String("make"), MarkdownHighlighter::CodeMake},
{QLatin1String("nix"), MarkdownHighlighter::CodeNix},
{QLatin1String("php"), MarkdownHighlighter::CodePHP},
{QLatin1String("py"), MarkdownHighlighter::CodePython},
{QLatin1String("python"), MarkdownHighlighter::CodePython},
{QLatin1String("qml"), MarkdownHighlighter::CodeQML},
{QLatin1String("rust"), MarkdownHighlighter::CodeRust},
{QLatin1String("sh"), MarkdownHighlighter::CodeBash},
{QLatin1String("sql"), MarkdownHighlighter::CodeSQL},
{QLatin1String("taggerscript"),
MarkdownHighlighter::CodeTaggerScript},
{QLatin1String("ts"), MarkdownHighlighter::CodeTypeScript},
{QLatin1String("typescript"), MarkdownHighlighter::CodeTypeScript},
{QLatin1String("v"), MarkdownHighlighter::CodeV},
{QLatin1String("vex"), MarkdownHighlighter::CodeVex},
{QLatin1String("xml"), MarkdownHighlighter::CodeXML},
{QLatin1String("yml"), MarkdownHighlighter::CodeYAML},
{QLatin1String("yaml"), MarkdownHighlighter::CodeYAML},
{QLatin1String("forth"), MarkdownHighlighter::CodeForth},
{QLatin1String("systemverilog"),
MarkdownHighlighter::CodeSystemVerilog}};
}
/**
* Sets the text formats
*
* @param formats
*/
void MarkdownHighlighter::setTextFormats(
QHash<HighlighterState, QTextCharFormat> formats) {
_formats = std::move(formats);
}
/**
* Sets a text format
*
* @param formats
*/
void MarkdownHighlighter::setTextFormat(HighlighterState state,
QTextCharFormat format) {
_formats[state] = std::move(format);
}
/**
* Does the Markdown highlighting
*
* @param text
*/
void MarkdownHighlighter::highlightBlock(const QString &text) {
if (currentBlockState() == HeadlineEnd) {
currentBlock().previous().setUserState(NoState);
addDirtyBlock(currentBlock().previous());
}
setCurrentBlockState(HighlighterState::NoState);
currentBlock().setUserState(HighlighterState::NoState);
highlightMarkdown(text);
_highlightingFinished = true;
}
void MarkdownHighlighter::highlightMarkdown(const QString &text) {
const bool isBlockCodeBlock = isCodeBlock(previousBlockState()) ||
text.startsWith(QLatin1String("```")) ||
text.startsWith(QLatin1String("~~~"));
if (!text.isEmpty() && !isBlockCodeBlock) {
highlightAdditionalRules(_highlightingRules, text);
highlightThematicBreak(text);
// needs to be called after the horizontal ruler highlighting
highlightHeadline(text);
highlightIndentedCodeBlock(text);
highlightLists(text);
highlightInlineRules(text);
}
highlightCommentBlock(text);
if (isBlockCodeBlock) highlightCodeFence(text);
highlightFrontmatterBlock(text);
}
/**
* @brief gets indentation(spaces) of text
* @param text
* @return 1, if 1 space, 2 if 2 spaces, 3 if 3 spaces. Otherwise 0
*/
static int getIndentation(const QString &text) {
int spaces = 0;
// no more than 3 spaces
while (spaces < 4 && spaces < text.length() &&
text.at(spaces) == QLatin1Char(' '))
++spaces;
return spaces;
}
static bool isParagraph(const QString &text) {
// blank line
if (text.isEmpty()) return false;
int indent = getIndentation(text);
// code block
if (indent >= 4) return false;
const auto textView = MH_SUBSTR(indent, -1);
if (textView.isEmpty()) return false;
// unordered listtextView
if (textView.startsWith(QStringLiteral("- ")) ||
textView.startsWith(QStringLiteral("+ ")) ||
textView.startsWith(QStringLiteral("* "))) {
return false;
}
// block quote
if (textView.startsWith(QStringLiteral("> "))) return false;
// atx heading
if (textView.startsWith(QStringLiteral("#"))) {
int firstSpace = textView.indexOf(' ');
if (firstSpace > 0 && firstSpace <= 7) {
return false;
}
}
// hr
auto isThematicBreak = [textView]() {
return std::all_of(textView.begin(), textView.end(),
[](QChar c) {
auto ch = c.unicode();
return ch == '-' || ch == ' ' || ch == '\t';
}) ||
std::all_of(textView.begin(), textView.end(),
[](QChar c) {
auto ch = c.unicode();
return ch == '+' || ch == ' ' || ch == '\t';
}) ||
std::all_of(textView.begin(), textView.end(), [](QChar c) {
auto ch = c.unicode();
return ch == '*' || ch == ' ' || ch == '\t';
});
};
if (isThematicBreak()) return false;
// ordered list
if (textView.at(0).isDigit()) {
int i = 1;
int count = 1;
for (; i < textView.size(); ++i) {
if (textView[i].isDigit()) {
count++;
continue;
} else
break;
}
// ordered list marker can't be more than 9 numbers
if (count <= 9 && i + 1 < textView.size() &&
(textView[i] == QLatin1Char('.') ||
textView[i] == QLatin1Char(')')) &&
textView[i + 1] == QLatin1Char(' ')) {
return false;
}
}
return true;
}
/**
* Highlight headlines
*
* @param text
*/
void MarkdownHighlighter::highlightHeadline(const QString &text) {
// three spaces indentation is allowed in headings
const int spacesOffset = getIndentation(text);
if (spacesOffset >= text.length() || spacesOffset == 4) return;
const bool headingFound = text.at(spacesOffset) == QLatin1Char('#');
if (headingFound) {
int headingLevel = 0;
int i = spacesOffset;
if (i >= text.length()) return;
while (i < text.length() && text.at(i) == QLatin1Char('#') &&
i < (spacesOffset + 6))
++i;
if (i < text.length() && text.at(i) == QLatin1Char(' '))
headingLevel = i - spacesOffset;
if (headingLevel > 0) {
const auto state =
HighlighterState(HighlighterState::H1 + headingLevel - 1);
// Set styling of the "#"s to "masked syntax", but with the size of
// the heading
auto maskedFormat = _formats[MaskedSyntax];
maskedFormat.setFontPointSize(_formats[state].fontPointSize());
setFormat(0, headingLevel, maskedFormat);
// Set the styling of the rest of the heading
setFormat(headingLevel + 1, text.length() - 1 - headingLevel,
_formats[state]);
setCurrentBlockState(state);
return;
}
}
auto hasOnlyHeadChars = [](const QString &txt, const QChar c,
int spaces) -> bool {
if (txt.isEmpty()) return false;
for (int i = spaces; i < txt.length(); ++i) {
if (txt.at(i) != c) return false;
}
return true;
};
// take care of ==== and ---- headlines
const QString prev = currentBlock().previous().text();
auto prevSpaces = getIndentation(prev);
const bool isPrevParagraph = isParagraph(prev);
if (text.at(spacesOffset) == QLatin1Char('=') && prevSpaces < 4 &&
isPrevParagraph) {
const bool pattern1 =
!prev.isEmpty() &&
hasOnlyHeadChars(text, QLatin1Char('='), spacesOffset);
if (pattern1) {
highlightSubHeadline(text, H1);
return;
}
} else if (text.at(spacesOffset) == QLatin1Char('-') && prevSpaces < 4 &&
isPrevParagraph) {
const bool pattern2 =
!prev.isEmpty() &&
hasOnlyHeadChars(text, QLatin1Char('-'), spacesOffset);
if (pattern2) {
highlightSubHeadline(text, H2);
return;
}
}
const QString nextBlockText = currentBlock().next().text();
if (nextBlockText.isEmpty()) return;
const int nextSpaces = getIndentation(nextBlockText);
const bool isCurrentParagraph = isParagraph(text);
if (nextSpaces >= nextBlockText.length()) return;
if (nextBlockText.at(nextSpaces) == QLatin1Char('=') && nextSpaces < 4 &&
isCurrentParagraph) {
const bool nextHasEqualChars =
hasOnlyHeadChars(nextBlockText, QLatin1Char('='), nextSpaces);
if (nextHasEqualChars) {
setFormat(0, text.length(), _formats[HighlighterState::H1]);
setCurrentBlockState(HighlighterState::H1);
}
} else if (nextBlockText.at(nextSpaces) == QLatin1Char('-') &&
nextSpaces < 4 && isCurrentParagraph) {
const bool nextHasMinusChars =
hasOnlyHeadChars(nextBlockText, QLatin1Char('-'), nextSpaces);
if (nextHasMinusChars) {
setFormat(0, text.length(), _formats[HighlighterState::H2]);
setCurrentBlockState(HighlighterState::H2);
}
}
}
void MarkdownHighlighter::highlightSubHeadline(const QString &text,
HighlighterState state) {
const QTextCharFormat &maskedFormat =
_formats[HighlighterState::MaskedSyntax];
QTextBlock previousBlock = currentBlock().previous();
// we check for both H1/H2 so that if the user changes his mind, and changes
// === to ---, changes be reflected immediately
if (previousBlockState() == H1 || previousBlockState() == H2 ||
previousBlockState() == NoState) {
QTextCharFormat currentMaskedFormat = maskedFormat;
// set the font size from the current rule's font format
currentMaskedFormat.setFontPointSize(_formats[state].fontPointSize());
setFormat(0, text.length(), currentMaskedFormat);
setCurrentBlockState(HeadlineEnd);
// we want to re-highlight the previous block
// this must not be done directly, but with a queue, otherwise it
// will crash
// setting the character format of the previous text, because this
// causes text to be formatted the same way when writing after
// the text
if (previousBlockState() != state) {
addDirtyBlock(previousBlock);
previousBlock.setUserState(state);
}
}
}
/**
* @brief highlight code blocks with four spaces or tabs in front of them
* and no list character after that
* @param text
*/
void MarkdownHighlighter::highlightIndentedCodeBlock(const QString &text) {
if (text.isEmpty() || (!text.startsWith(QLatin1String(" ")) &&
!text.startsWith(QLatin1Char('\t'))))
return;
const QString prevTrimmed = currentBlock().previous().text().trimmed();
// previous line must be empty according to CommonMark except if it is a
// heading https://spec.commonmark.org/0.29/#indented-code-block
if (!prevTrimmed.isEmpty() && previousBlockState() != CodeBlockIndented &&
!isHeading(previousBlockState()) && previousBlockState() != HeadlineEnd)
return;
const QString trimmed = text.trimmed();
// should not be in a list
if (trimmed.startsWith(QLatin1String("- ")) ||
trimmed.startsWith(QLatin1String("+ ")) ||
trimmed.startsWith(QLatin1String("* ")) ||
(trimmed.length() >= 1 && trimmed.at(0).isNumber()))
return;
setCurrentBlockState(CodeBlockIndented);
setFormat(0, text.length(), _formats[CodeBlock]);
}
void MarkdownHighlighter::highlightCodeFence(const QString &text) {
// already in tilde block
if ((previousBlockState() == CodeBlockTilde ||
previousBlockState() == CodeBlockTildeComment ||
previousBlockState() >= CodeCpp + tildeOffset)) {
highlightCodeBlock(text, QStringLiteral("~~~"));
// start of a tilde block
} else if ((previousBlockState() != CodeBlock &&
previousBlockState() < CodeCpp) &&
text.startsWith(QLatin1String("~~~"))) {
highlightCodeBlock(text, QStringLiteral("~~~"));
} else {
// back tick block
highlightCodeBlock(text);
}
}
/**
* Highlight multi-line code blocks
*
* @param text
*/
void MarkdownHighlighter::highlightCodeBlock(const QString &text,
const QString &opener) {
if (text.startsWith(opener)) {
// if someone decides to put these on the same line
// interpret it as inline code, not code block
if (text.endsWith(QLatin1String("```")) && text.length() > 3) {
setFormat(3, text.length() - 3,
_formats[HighlighterState::InlineCodeBlock]);
setFormat(0, 3, _formats[HighlighterState::MaskedSyntax]);
setFormat(text.length() - 3, 3,
_formats[HighlighterState::MaskedSyntax]);
return;
}
if ((previousBlockState() != CodeBlock &&
previousBlockState() != CodeBlockTilde) &&
(previousBlockState() != CodeBlockComment &&
previousBlockState() != CodeBlockTildeComment) &&
previousBlockState() < CodeCpp) {
const QString &lang = text.mid(3, text.length()).toLower();
HighlighterState progLang = _langStringToEnum.value(lang);
if (progLang >= CodeCpp) {
const int state = text.startsWith(QLatin1String("```"))
? progLang
: progLang + tildeOffset;
setCurrentBlockState(state);
} else {
const int state =
opener == QLatin1String("```") ? CodeBlock : CodeBlockTilde;
setCurrentBlockState(state);
}
} else if (isCodeBlock(previousBlockState())) {
const int state = opener == QLatin1String("```")
? CodeBlockEnd
: CodeBlockTildeEnd;
setCurrentBlockState(state);
}
// set the font size from the current rule's font format
QTextCharFormat &maskedFormat = _formats[MaskedSyntax];
maskedFormat.setFontPointSize(_formats[CodeBlock].fontPointSize());
setFormat(0, text.length(), maskedFormat);
} else if (isCodeBlock(previousBlockState())) {
setCurrentBlockState(previousBlockState());
highlightSyntax(text);
}
}
/**
* @brief Does the code syntax highlighting
* @param text
*/
void MarkdownHighlighter::highlightSyntax(const QString &text) {
if (text.isEmpty()) return;
const auto textLen = text.length();
QChar comment;
bool isCSS = false;
bool isYAML = false;
bool isMake = false;
bool isForth = false;
QMultiHash<char, QLatin1String> keywords{};
QMultiHash<char, QLatin1String> others{};
QMultiHash<char, QLatin1String> types{};
QMultiHash<char, QLatin1String> builtin{};
QMultiHash<char, QLatin1String> literals{};
// apply the default code block format first
setFormat(0, textLen, _formats[CodeBlock]);
switch (currentBlockState()) {
case HighlighterState::CodeCpp:
case HighlighterState::CodeCpp + tildeOffset:
case HighlighterState::CodeCppComment:
case HighlighterState::CodeCppComment + tildeOffset:
loadCppData(types, keywords, builtin, literals, others);
break;
case HighlighterState::CodeJs:
case HighlighterState::CodeJs + tildeOffset:
case HighlighterState::CodeJsComment:
case HighlighterState::CodeJsComment + tildeOffset:
loadJSData(types, keywords, builtin, literals, others);
break;
case HighlighterState::CodeC:
case HighlighterState::CodeC + tildeOffset:
case HighlighterState::CodeCComment:
case HighlighterState::CodeCComment + tildeOffset:
loadCppData(types, keywords, builtin, literals, others);
break;
case HighlighterState::CodeBash:
case HighlighterState::CodeBash + tildeOffset:
loadShellData(types, keywords, builtin, literals, others);
comment = QLatin1Char('#');
break;
case HighlighterState::CodePHP:
case HighlighterState::CodePHP + tildeOffset:
case HighlighterState::CodePHPComment:
case HighlighterState::CodePHPComment + tildeOffset:
loadPHPData(types, keywords, builtin, literals, others);
break;
case HighlighterState::CodeQML:
case HighlighterState::CodeQML + tildeOffset:
case HighlighterState::CodeQMLComment:
case HighlighterState::CodeQMLComment + tildeOffset:
loadQMLData(types, keywords, builtin, literals, others);
break;
case HighlighterState::CodePython:
case HighlighterState::CodePython + tildeOffset:
loadPythonData(types, keywords, builtin, literals, others);
comment = QLatin1Char('#');
break;
case HighlighterState::CodeRust:
case HighlighterState::CodeRust + tildeOffset:
case HighlighterState::CodeRustComment:
case HighlighterState::CodeRustComment + tildeOffset:
loadRustData(types, keywords, builtin, literals, others);
break;
case HighlighterState::CodeJava:
case HighlighterState::CodeJava + tildeOffset:
case HighlighterState::CodeJavaComment:
case HighlighterState::CodeJavaComment + tildeOffset:
loadJavaData(types, keywords, builtin, literals, others);
break;
case HighlighterState::CodeCSharp:
case HighlighterState::CodeCSharp + tildeOffset:
case HighlighterState::CodeCSharpComment:
case HighlighterState::CodeCSharpComment + tildeOffset:
loadCSharpData(types, keywords, builtin, literals, others);
break;
case HighlighterState::CodeGo:
case HighlighterState::CodeGo + tildeOffset:
case HighlighterState::CodeGoComment:
case HighlighterState::CodeGoComment + tildeOffset:
loadGoData(types, keywords, builtin, literals, others);
break;
case HighlighterState::CodeV:
case HighlighterState::CodeV + tildeOffset:
case HighlighterState::CodeVComment:
case HighlighterState::CodeVComment + tildeOffset:
loadVData(types, keywords, builtin, literals, others);
break;
case HighlighterState::CodeSQL:
case HighlighterState::CodeSQL + tildeOffset:
loadSQLData(types, keywords, builtin, literals, others);
break;
case HighlighterState::CodeJSON:
case HighlighterState::CodeJSON + tildeOffset:
loadJSONData(types, keywords, builtin, literals, others);
break;
case HighlighterState::CodeXML:
case HighlighterState::CodeXML + tildeOffset:
xmlHighlighter(text);
return;
case HighlighterState::CodeCSS:
case HighlighterState::CodeCSS + tildeOffset:
case HighlighterState::CodeCSSComment:
case HighlighterState::CodeCSSComment + tildeOffset:
isCSS = true;
loadCSSData(types, keywords, builtin, literals, others);
break;
case HighlighterState::CodeTypeScript:
case HighlighterState::CodeTypeScript + tildeOffset:
case HighlighterState::CodeTypeScriptComment:
case HighlighterState::CodeTypeScriptComment + tildeOffset:
loadTypescriptData(types, keywords, builtin, literals, others);
break;
case HighlighterState::CodeYAML:
case HighlighterState::CodeYAML + tildeOffset:
isYAML = true;
comment = QLatin1Char('#');
loadYAMLData(types, keywords, builtin, literals, others);
break;
case HighlighterState::CodeINI:
case HighlighterState::CodeINI + tildeOffset:
iniHighlighter(text);
return;
case HighlighterState::CodeTaggerScript:
case HighlighterState::CodeTaggerScript + tildeOffset:
taggerScriptHighlighter(text);
return;
case HighlighterState::CodeVex:
case HighlighterState::CodeVex + tildeOffset:
case HighlighterState::CodeVexComment:
case HighlighterState::CodeVexComment + tildeOffset:
loadVEXData(types, keywords, builtin, literals, others);
break;
case HighlighterState::CodeCMake:
case HighlighterState::CodeCMake + tildeOffset:
loadCMakeData(types, keywords, builtin, literals, others);
comment = QLatin1Char('#');
break;
case HighlighterState::CodeMake:
case HighlighterState::CodeMake + tildeOffset:
isMake = true;
loadMakeData(types, keywords, builtin, literals, others);
comment = QLatin1Char('#');
break;
case HighlighterState::CodeNix:
case HighlighterState::CodeNix + tildeOffset:
loadNixData(types, keywords, builtin, literals, others);
comment = QLatin1Char('#');
break;
case HighlighterState::CodeForth:
case HighlighterState::CodeForth + tildeOffset:
case HighlighterState::CodeForthComment:
case HighlighterState::CodeForthComment + tildeOffset:
isForth = true;
loadForthData(types, keywords, builtin, literals, others);
break;
case HighlighterState::CodeSystemVerilog:
case HighlighterState::CodeSystemVerilogComment:
loadSystemVerilogData(types, keywords, builtin, literals, others);
break;
default:
setFormat(0, textLen, _formats[CodeBlock]);
return;
}
auto applyCodeFormat =
[this](int i, const QMultiHash<char, QLatin1String> &data,
const QString &text, const QTextCharFormat &fmt) -> int {
// check if we are at the beginning OR if this is the start of a word
if (i == 0 || (!text.at(i - 1).isLetterOrNumber() &&
text.at(i - 1) != QLatin1Char('_'))) {
const char c = text.at(i).toLatin1();
auto it = data.find(c);
for (; it != data.end() && it.key() == c; ++it) {
// we have a word match check
// 1. if we are at the end
// 2. if we have a complete word
const QLatin1String &word = it.value();
if (word == MH_SUBSTR(i, word.size()) &&
(i + word.size() == text.length() ||
(!text.at(i + word.size()).isLetterOrNumber() &&
text.at(i + word.size()) != QLatin1Char('_')))) {
setFormat(i, word.size(), fmt);
i += word.size();
}
}
}
return i;
};
const QTextCharFormat &formatType = _formats[CodeType];
const QTextCharFormat &formatKeyword = _formats[CodeKeyWord];
const QTextCharFormat &formatComment = _formats[CodeComment];
const QTextCharFormat &formatNumLit = _formats[CodeNumLiteral];
const QTextCharFormat &formatBuiltIn = _formats[CodeBuiltIn];
const QTextCharFormat &formatOther = _formats[CodeOther];
for (int i = 0; i < textLen; ++i) {
if (currentBlockState() != -1 && currentBlockState() % 2 != 0)
goto Comment;
while (i < textLen && !text[i].isLetter()) {
if (text[i].isSpace()) {
++i;
// make sure we don't cross the bound
if (i == textLen) break;
if (text[i].isLetter()) break;
continue;
}
// inline comment
if (comment.isNull() && text[i] == QLatin1Char('/')) {
if ((i + 1) < textLen) {
if (text[i + 1] == QLatin1Char('/')) {
setFormat(i, textLen, formatComment);
return;
} else if (text[i + 1] == QLatin1Char('*')) {
Comment:
int next = text.indexOf(QLatin1String("*/"), i);
if (next == -1) {
// we didn't find a comment end.
// Check if we are already in a comment block
if (currentBlockState() % 2 == 0)
setCurrentBlockState(currentBlockState() + 1);
setFormat(i, textLen, formatComment);
return;
} else {
// we found a comment end
// mark this block as code if it was previously
// comment. First check if the comment ended on the
// same line. if modulo 2 is not equal to zero, it
// means we are in a comment, -1 will set this
// block's state as language
if (currentBlockState() % 2 != 0) {
setCurrentBlockState(currentBlockState() - 1);
}
next += 2;
setFormat(i, next - i, formatComment);
i = next;
if (i >= textLen) return;
}
}