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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "csshighlighter_p.h"
QT_BEGIN_NAMESPACE
using namespace Qt::StringLiterals;
namespace qdesigner_internal {
CssHighlighter::CssHighlighter(const CssHighlightColors &colors,
QTextDocument *document)
: QSyntaxHighlighter(document), m_colors(colors)
{
}
void CssHighlighter::highlightBlock(const QString& text)
{
enum Token { ALNUM, LBRACE, RBRACE, COLON, SEMICOLON, COMMA, QUOTE, SLASH, STAR };
static const int transitions[10][9] = {
{ Selector, Property, Selector, Pseudo, Property, Selector, Quote, MaybeComment, Selector }, // Selector
{ Property, Property, Selector, Value, Property, Property, Quote, MaybeComment, Property }, // Property
{ Value, Property, Selector, Value, Property, Value, Quote, MaybeComment, Value }, // Value
{ Pseudo1, Property, Selector, Pseudo2, Selector, Selector, Quote, MaybeComment, Pseudo }, // Pseudo
{ Pseudo1, Property, Selector, Pseudo, Selector, Selector, Quote, MaybeComment, Pseudo1 }, // Pseudo1
{ Pseudo2, Property, Selector, Pseudo, Selector, Selector, Quote, MaybeComment, Pseudo2 }, // Pseudo2
{ Quote, Quote, Quote, Quote, Quote, Quote, -1, Quote, Quote }, // Quote
{ -1, -1, -1, -1, -1, -1, -1, -1, Comment }, // MaybeComment
{ Comment, Comment, Comment, Comment, Comment, Comment, Comment, Comment, MaybeCommentEnd }, // Comment
{ Comment, Comment, Comment, Comment, Comment, Comment, Comment, -1, MaybeCommentEnd } // MaybeCommentEnd
};
qsizetype lastIndex = 0;
bool lastWasSlash = false;
int state = previousBlockState(), save_state;
if (state == -1) {
// As long as the text is empty, leave the state undetermined
if (text.isEmpty()) {
setCurrentBlockState(-1);
return;
}
// The initial state is based on the precense of a : and the absense of a {.
// This is because Qt style sheets support both a full stylesheet as well as
// an inline form with just properties.
state = save_state = (text.indexOf(u':') > -1 &&
text.indexOf(u'{') == -1) ? Property : Selector;
} else {
save_state = state>>16;
state &= 0x00ff;
}
if (state == MaybeCommentEnd) {
state = Comment;
} else if (state == MaybeComment) {
state = save_state;
}
for (qsizetype i = 0; i < text.size(); ++i) {
int token = ALNUM;
const QChar c = text.at(i);
const char a = c.toLatin1();
if (state == Quote) {
if (a == '\\') {
lastWasSlash = true;
} else {
if (a == '\"' && !lastWasSlash) {
token = QUOTE;
}
lastWasSlash = false;
}
} else {
switch (a) {
case '{': token = LBRACE; break;
case '}': token = RBRACE; break;
case ':': token = COLON; break;
case ';': token = SEMICOLON; break;
case ',': token = COMMA; break;
case '\"': token = QUOTE; break;
case '/': token = SLASH; break;
case '*': token = STAR; break;
default: break;
}
}
int new_state = transitions[state][token];
if (new_state != state) {
bool include_token = new_state == MaybeCommentEnd || (state == MaybeCommentEnd && new_state!= Comment)
|| state == Quote;
highlight(text, lastIndex, i-lastIndex+include_token, state);
if (new_state == Comment) {
lastIndex = i-1; // include the slash and star
} else {
lastIndex = i + ((token == ALNUM || new_state == Quote) ? 0 : 1);
}
}
if (new_state == -1) {
state = save_state;
} else if (state <= Pseudo2) {
save_state = state;
state = new_state;
} else {
state = new_state;
}
}
highlight(text, lastIndex, text.size() - lastIndex, state);
setCurrentBlockState(state + (save_state<<16));
}
void CssHighlighter::highlight(const QString &text, int start, int length, int state)
{
if (start >= text.size() || length <= 0)
return;
QTextCharFormat format;
switch (state) {
case Selector:
setFormat(start, length, m_colors.selector);
break;
case Property:
setFormat(start, length, m_colors.property);
break;
case Value:
setFormat(start, length, m_colors.value);
break;
case Pseudo1:
setFormat(start, length, m_colors.pseudo1);
break;
case Pseudo2:
setFormat(start, length, m_colors.pseudo2);
break;
case Quote:
setFormat(start, length, m_colors.quote);
break;
case Comment:
case MaybeCommentEnd:
format.setForeground(m_colors.comment);
setFormat(start, length, format);
break;
default:
break;
}
}
} // namespace qdesigner_internal
QT_END_NAMESPACE
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