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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "syntaxhighlighter.h"
#include <QtCore/qregularexpression.h>
#include <QtQuick3DRuntimeRender/private/qssgshadermaterialadapter_p.h>
#include <QtQuick3DRuntimeRender/private/qssgrenderdefaultmaterialshadergenerator_p.h>
#include <QtQuick3DGlslParser/private/glsllexer_p.h>
#include <QtQuick3DGlslParser/private/glslparser_p.h>
QT_BEGIN_NAMESPACE
// Text color and style categories
enum TextStyle : quint8 {
C_VISUAL_WHITESPACE,
C_PREPROCESSOR,
C_NUMBER,
C_COMMENT,
C_KEYWORD,
C_PARAMETER,
C_REMOVED_LINE
};
static constexpr TextStyle GLSLReservedKeyword = C_REMOVED_LINE;
static QTextCharFormat formatForCategory(TextStyle category)
{
switch (category) {
case C_PARAMETER:
{
QTextCharFormat fmt;
fmt.setForeground(QColor::fromRgb(0xaa, 0xaa, 0xff));
return fmt;
}
case C_PREPROCESSOR:
{
QTextCharFormat fmt;
fmt.setForeground(QColor::fromRgb(0x55, 0x55, 0xff));
return fmt;
}
case C_NUMBER:
{
QTextCharFormat fmt;
fmt.setForeground(QColor::fromRgb(0xff, 0x55, 0xff));
return fmt;
}
case C_COMMENT:
{
QTextCharFormat fmt;
fmt.setForeground(QColor::fromRgb(0x55, 0xff, 0xff));
return fmt;
}
case C_KEYWORD:
{
QTextCharFormat fmt;
fmt.setForeground(QColor::fromRgb(0xff, 0xff, 0x55));
return fmt;
}
case C_REMOVED_LINE:
Q_FALLTHROUGH();
case C_VISUAL_WHITESPACE:
break;
}
return QTextCharFormat();
}
SyntaxHighlighter::SyntaxHighlighter(QObject *p)
: QSyntaxHighlighter(p)
{
}
void SyntaxHighlighter::highlightBlock(const QString &text)
{
if (m_keywords.isEmpty()) {
const auto keywords = QtQuick3DEditorHelpers::CustomMaterial::preprocessorVars();
for (const auto &kw : keywords)
m_keywords.insert(kw);
}
if (m_argumentKeywords.isEmpty()) {
const auto args = QtQuick3DEditorHelpers::CustomMaterial::reservedArgumentNames();
for (const auto &arg : args)
m_argumentKeywords.insert(arg);
}
const int previousState = previousBlockState();
int state = 0;
if (previousState != -1)
state = previousState & 0xff;
const QByteArray data = text.toLatin1();
GLSL::Lexer lex(/*engine=*/ nullptr, data.constData(), data.size());
lex.setState(state);
lex.setScanKeywords(false);
lex.setScanComments(true);
lex.setVariant(GLSL::Lexer::Variant_GLSL_400);
QList<GLSL::Token> tokens;
GLSL::Token tk;
do {
lex.yylex(&tk);
tokens.append(tk);
} while (tk.isNot(GLSL::Parser::EOF_SYMBOL));
state = lex.state(); // refresh the state
if (tokens.isEmpty()) {
setCurrentBlockState(previousState);
if (!text.isEmpty()) // the empty line can still contain whitespace
setFormat(0, text.size(), formatForCategory(C_VISUAL_WHITESPACE));
return;
}
for (int i = 0, end = tokens.size(); i != end; ++i) {
const GLSL::Token &tk = tokens.at(i);
int previousTokenEnd = 0;
if (i != 0) {
// mark the whitespaces
previousTokenEnd = tokens.at(i - 1).begin() + tokens.at(i - 1).length;
}
if (previousTokenEnd != tk.begin())
setFormat(previousTokenEnd, tk.begin() - previousTokenEnd, formatForCategory(C_VISUAL_WHITESPACE));
if (tk.is(GLSL::Parser::T_NUMBER)) {
setFormat(tk.begin(), tk.length, formatForCategory(C_NUMBER));
} else if (tk.is(GLSL::Parser::T_COMMENT)) {
highlightLine(text, tk.begin(), tk.length, formatForCategory(C_COMMENT));
} else if (tk.is(GLSL::Parser::T_IDENTIFIER)) {
int kind = lex.findKeyword(data.constData() + tk.position, tk.length);
if (kind == GLSL::Parser::T_IDENTIFIER) {
if (m_keywords.contains(QByteArrayView(data.constData() + tk.position, tk.length)))
setFormat(tk.position, tk.length, formatForCategory(C_PREPROCESSOR));
if (m_argumentKeywords.contains(QByteArrayView(data.constData() + tk.position, tk.length)))
setFormat(tk.position, tk.length, formatForCategory(C_PARAMETER));
}
if (kind == GLSL::Parser::T_RESERVED)
setFormat(tk.position, tk.length, formatForCategory(GLSLReservedKeyword));
else if (kind != GLSL::Parser::T_IDENTIFIER)
setFormat(tk.position, tk.length, formatForCategory(C_KEYWORD));
}
}
// mark the trailing white spaces
{
const GLSL::Token tk = tokens.last();
const int lastTokenEnd = tk.begin() + tk.length;
if (text.size() > lastTokenEnd)
highlightLine(text, lastTokenEnd, text.size() - lastTokenEnd, QTextCharFormat());
}
}
void SyntaxHighlighter::highlightLine(const QString &text, int position, int length,
const QTextCharFormat &format)
{
const QTextCharFormat visualSpaceFormat = formatForCategory(C_VISUAL_WHITESPACE);
const int end = position + length;
int index = position;
while (index != end) {
const bool isSpace = text.at(index).isSpace();
const int start = index;
do { ++index; }
while (index != end && text.at(index).isSpace() == isSpace);
const int tokenLength = index - start;
if (isSpace)
setFormat(start, tokenLength, visualSpaceFormat);
else if (format.isValid())
setFormat(start, tokenLength, format);
}
}
QQuickTextDocument *SyntaxHighlighter::document() const
{
return m_quickTextDocument;
}
void SyntaxHighlighter::setDocument(QQuickTextDocument *newDocument)
{
if (m_quickTextDocument == newDocument)
return;
m_quickTextDocument = newDocument;
QSyntaxHighlighter::setDocument(m_quickTextDocument != nullptr ? m_quickTextDocument->textDocument() : nullptr);
emit documentChanged();
}
QT_END_NAMESPACE
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