101 lines
2.8 KiB
C++
101 lines
2.8 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#include "base/parse_helper.h"
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namespace base {
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namespace parse {
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// inspired by https://github.com/sindresorhus/strip-json-comments
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QByteArray stripComments(const QByteArray &content) {
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enum class InsideComment {
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None,
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SingleLine,
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MultiLine,
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};
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auto insideComment = InsideComment::None;
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auto insideString = false;
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QByteArray result;
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auto begin = content.cbegin(), end = content.cend(), offset = begin;
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auto feedContent = [&result, &offset, end](const char *ch) {
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if (ch > offset) {
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if (result.isEmpty()) result.reserve(end - offset - 2);
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result.append(offset, ch - offset);
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offset = ch;
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}
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};
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auto feedComment = [&result, &offset, end](const char *ch) {
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if (ch > offset) {
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if (result.isEmpty()) result.reserve(end - offset - 2);
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result.append(' ');
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offset = ch;
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}
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};
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for (auto ch = offset; ch != end;) {
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auto currentChar = *ch;
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auto nextChar = (ch + 1 == end) ? 0 : *(ch + 1);
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if (insideComment == InsideComment::None && currentChar == '"') {
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auto escaped = ((ch > begin) && *(ch - 1) == '\\') && ((ch - 1 < begin) || *(ch - 2) != '\\');
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if (!escaped) {
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insideString = !insideString;
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}
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}
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if (insideString) {
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++ch;
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continue;
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}
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if (insideComment == InsideComment::None && currentChar == '/' && nextChar == '/') {
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feedContent(ch);
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insideComment = InsideComment::SingleLine;
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ch += 2;
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} else if (insideComment == InsideComment::SingleLine && currentChar == '\r' && nextChar == '\n') {
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feedComment(ch);
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ch += 2;
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insideComment = InsideComment::None;
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} else if (insideComment == InsideComment::SingleLine && currentChar == '\n') {
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feedComment(ch);
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++ch;
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insideComment = InsideComment::None;
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} else if (insideComment == InsideComment::None && currentChar == '/' && nextChar == '*') {
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feedContent(ch);
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ch += 2;
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insideComment = InsideComment::MultiLine;
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} else if (insideComment == InsideComment::MultiLine && currentChar == '*' && nextChar == '/') {
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ch += 2;
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feedComment(ch);
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insideComment = InsideComment::None;
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} else if (insideComment == InsideComment::MultiLine && currentChar == '\r' && nextChar == '\n') {
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feedComment(ch);
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ch += 2;
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feedContent(ch);
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} else if (insideComment == InsideComment::MultiLine && currentChar == '\n') {
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feedComment(ch);
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++ch;
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feedContent(ch);
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} else {
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++ch;
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}
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}
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if (insideComment == InsideComment::MultiLine) {
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// unexpected end of content
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}
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if (insideComment == InsideComment::None && end > offset) {
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if (result.isEmpty()) {
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return content;
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} else {
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result.append(offset, end - offset);
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}
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}
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return result;
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}
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} // namespace parse
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} // namespace base
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