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LibMarkdown: Rewrite Inline text parser to be more forgiving

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The previous Text::parse was not able to give up on parsing a textual
element, and just leave it as plain text. Because this is a very
important part of markdown, I fully rewrote the parser to support this
without having to backtrack. Also the parser now some other little
features, such ast delimiter runs and flanking.
This commit is contained in:
Peter Elliott 2021-09-06 19:11:46 -06:00 • committed by Andreas Kling
parent 80e58dab9a
commit ec9f892899
10 changed files with 462 additions and 397 deletions
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22
Userland/Libraries/LibMarkdown/Document.cpp
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
* Copyright (c) 2021, Peter Elliott <pelliott@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -75,15 +76,16 @@ OwnPtr<Document> Document::parse(const StringView& str)
auto lines = lines_vec.begin();
auto document = make<Document>();
auto& blocks = document->m_blocks;
NonnullOwnPtrVector<Paragraph::Line> paragraph_lines;
StringBuilder paragraph_text;
auto flush_paragraph = [&] {
if (paragraph_lines.is_empty())
if (paragraph_text.is_empty())
return;
auto paragraph = make<Paragraph>(move(paragraph_lines));
auto paragraph = make<Paragraph>(Text::parse(paragraph_text.build()));
document->m_blocks.append(move(paragraph));
paragraph_lines.clear();
paragraph_text.clear();
};
while (true) {
if (lines.is_end())
break;
@ -98,7 +100,7 @@ OwnPtr<Document> Document::parse(const StringView& str)
|| helper<Heading>(lines, blocks) || helper<HorizontalRule>(lines, blocks);
if (any) {
if (!paragraph_lines.is_empty()) {
if (!paragraph_text.is_empty()) {
auto last_block = document->m_blocks.take_last();
flush_paragraph();
document->m_blocks.append(move(last_block));
@ -106,15 +108,11 @@ OwnPtr<Document> Document::parse(const StringView& str)
continue;
}
auto line = Paragraph::Line::parse(lines);
if (!line)
return {};
paragraph_lines.append(line.release_nonnull());
paragraph_text.append(*lines++);
paragraph_text.append("\n");
}
if (!paragraph_lines.is_empty())
flush_paragraph();
flush_paragraph();
return document;
}