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/************************************************************************
**
** Copyright (C) 2023-2024 Kevin B. Hendricks, Stratford, ON Canada
**
** This file is part of PageEdit.
**
** PageEdit is free software: you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation, either version 3 of the License, or
** (at your option) any later version.
**
** PageEdit is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with PageEdit. If not, see <http://www.gnu.org/licenses/>.
**
*************************************************************************/
#include <QRegularExpression>
#include <QDebug>
#include "Utility.h"
#include "ClassInfo.h"
const int TAB_SPACES_WIDTH = 4;
static const QString DELIMITERS = "}{;";
// Note: CSSProperties and CSSSelectors are simple struct that this code
// created with new and so need to be manually cleaned up to prevent
// large memory leaks
ClassInfo::ClassInfo(const QString &text)
: m_OriginalText(text)
{
parseCSSSelectors(text, 0, 0);
}
// Need to manually clean up the Selector List
ClassInfo::~ClassInfo()
{
foreach(CSSSelector * sp, m_CSSSelectors) {
if (sp) delete sp;
}
}
QList<ClassInfo::CSSSelector *> ClassInfo::getClassSelectors()
{
QList<ClassInfo::CSSSelector *> selectors;
foreach(ClassInfo::CSSSelector * cssSelector, m_CSSSelectors) {
if (cssSelector->classNames.count() > 0) {
selectors.append(cssSelector);
}
}
return selectors;
}
void ClassInfo::parseCSSSelectors(const QString &text, const int &offsetLines, const int &offsetPos)
{
QRegularExpression strip_attributes_regex("\\[[^\\]]*\\]");
QRegularExpression strip_ids_regex("#[^\\s\\.]+");
// QRegularExpression strip_non_name_chars_regex("[^A-Za-z0-9_\\-\\.:]+");
QRegularExpression strip_non_name_chars_regex("[^\\w_\\-\\.:]+", QRegularExpression::UseUnicodePropertiesOption);
QString search_text = replaceBlockComments(text);
// CSS selectors can be in a myriad of formats... the class based selectors could be:
// .c1 / e1.c1 / e1.c1.c2 / e1[class~=c1] / e1#id1.c1 / e1.c1#id1 / .c1, .c2 / ...
// Then the element based selectors could be:
// e1 / e1 > e2 / e1 e2 / e1 + e2 / e1[attribs...] / e1#id1 / e1, e2 / ...
// Really needs a parser to do this properly, this will only handle the 90% scenarios.
// Note: selector groups can be sepaparated by line feeds so you can not stop
// at the beginning of line when searching for the start of a selector
int pos = 0;
int open_brace_pos = -1;
int close_brace_pos = -1;
while (true) {
open_brace_pos = search_text.indexOf(QChar('{'), pos);
if (open_brace_pos < 0) {
break;
}
// Now search backwards until we get a line (or more) containing text .
bool have_text = false;
pos = open_brace_pos - 1;
while ((pos >= 0) && (!DELIMITERS.contains(search_text.at(pos)) || !have_text)) {
if (search_text.at(pos).isLetter()) {
have_text = true;
}
pos--;
}
pos++;
if (!have_text) {
// Really badly formed CSS document - try to skip ahead
pos = open_brace_pos + 1;
continue;
}
close_brace_pos = search_text.indexOf(QChar('}'), open_brace_pos + 1);
if (close_brace_pos < 0) {
// Another badly formed scenario - no point in looking further
break;
}
// Skip past leading whitespace/newline.
while (search_text.at(pos).isSpace()) {
pos++;
}
int line = search_text.left(pos + 1).count(QChar('\n')) + 1;
QString selector_text = search_text.mid(pos, open_brace_pos - pos).trimmed();
// Handle case of a selector group containing multiple declarations
QStringList matches = selector_text.split(QChar(','), Qt::SkipEmptyParts);
foreach(QString match, matches) {
CSSSelector *selector = new CSSSelector();
selector->text = selector_text;
selector->groupText = match.trimmed();
selector->position = pos + offsetPos;
selector->line = line + offsetLines;
selector->isGroup = matches.length() > 1;
selector->openingBracePos = open_brace_pos + offsetPos;
selector->closingBracePos = close_brace_pos + offsetPos;
// Need to parse our selector text to determine what sort of selector it contains.
// First strip out any attributes and then identifiers
match.replace(strip_attributes_regex, "");
match.replace(strip_ids_regex, "");
// Also replace any other characters like > or + not of interest
match.replace(strip_non_name_chars_regex, QChar(' '));
// Now break it down into the element components
QStringList elements = match.trimmed().split(QChar(' '), Qt::SkipEmptyParts);
foreach(QString element, elements) {
if (element.contains(QChar('.'))) {
QStringList parts = element.split('.');
if (!parts.at(0).isEmpty()) {
selector->elementNames.append(parts.at(0));
}
for (int i = 1; i < parts.length(); i++) {
selector->classNames.append(parts.at(i));
}
} else {
selector->elementNames.append(element);
}
}
m_CSSSelectors.append(selector);
}
pos = open_brace_pos + 1;
}
}
QString ClassInfo::replaceBlockComments(const QString &text)
{
// We take a copy of the text and remove all block comments from it.
// However we must be careful to replace with spaces/keep line feeds
// so that do not corrupt the position information used by the parser.
QString new_text(text);
QRegularExpression comment_search("/\\*.*\\*/", QRegularExpression::InvertedGreedinessOption|QRegularExpression::DotMatchesEverythingOption);
int start = 0;
int comment_index;
while (true) {
int comment_len = 0;
comment_index = -1;
QRegularExpressionMatch match = comment_search.match(new_text, start);
if (match.hasMatch()) {
comment_index = match.capturedStart();
comment_len = match.capturedLength();
}
if (comment_index < 0) {
break;
}
QString match_text = new_text.mid(comment_index, comment_len);
match_text.replace(QRegularExpression("[^\r\n]"), QChar(' '));
new_text.remove(comment_index, match_text.length());
new_text.insert(comment_index, match_text);
// Prepare for the next comment.
start = comment_index + comment_len;
if (start >= new_text.length() - 2) {
break;
}
}
return new_text;
}
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