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/*
* Copyright (c) 2021, Peter Elliott <pelliott@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Forward.h>
#include <LibMarkdown/BlockQuote.h>
#include <LibMarkdown/CodeBlock.h>
#include <LibMarkdown/ContainerBlock.h>
#include <LibMarkdown/Heading.h>
#include <LibMarkdown/HorizontalRule.h>
#include <LibMarkdown/List.h>
#include <LibMarkdown/Paragraph.h>
#include <LibMarkdown/Table.h>
#include <LibMarkdown/Visitor.h>
namespace Markdown {
DeprecatedString ContainerBlock::render_to_html(bool tight) const
{
StringBuilder builder;
for (size_t i = 0; i + 1 < m_blocks.size(); ++i) {
auto s = m_blocks[i]->render_to_html(tight);
builder.append(s);
}
// I don't like this edge case.
if (m_blocks.size() != 0) {
auto& block = m_blocks[m_blocks.size() - 1];
auto s = block->render_to_html(tight);
if (tight && dynamic_cast<Paragraph const*>(block.ptr())) {
builder.append(s.substring_view(0, s.length() - 1));
} else {
builder.append(s);
}
}
return builder.to_deprecated_string();
}
Vector<DeprecatedString> ContainerBlock::render_lines_for_terminal(size_t view_width) const
{
Vector<DeprecatedString> lines;
for (auto& block : m_blocks) {
for (auto& line : block->render_lines_for_terminal(view_width))
lines.append(move(line));
}
return lines;
}
RecursionDecision ContainerBlock::walk(Visitor& visitor) const
{
RecursionDecision rd = visitor.visit(*this);
if (rd != RecursionDecision::Recurse)
return rd;
for (auto const& block : m_blocks) {
rd = block->walk(visitor);
if (rd == RecursionDecision::Break)
return rd;
}
return RecursionDecision::Continue;
}
template<class CodeBlock>
static bool try_parse_block(LineIterator& lines, Vector<NonnullOwnPtr<Block>>& blocks, Heading* current_section)
{
OwnPtr<CodeBlock> block = CodeBlock::parse(lines, current_section);
if (!block)
return false;
blocks.append(block.release_nonnull());
return true;
}
template<typename BlockType>
static bool try_parse_block(LineIterator& lines, Vector<NonnullOwnPtr<Block>>& blocks)
{
OwnPtr<BlockType> block = BlockType::parse(lines);
if (!block)
return false;
blocks.append(block.release_nonnull());
return true;
}
OwnPtr<ContainerBlock> ContainerBlock::parse(LineIterator& lines)
{
Vector<NonnullOwnPtr<Block>> blocks;
StringBuilder paragraph_text;
Heading* current_section = nullptr;
auto flush_paragraph = [&] {
if (paragraph_text.is_empty())
return;
auto paragraph = make<Paragraph>(Text::parse(paragraph_text.to_deprecated_string()));
blocks.append(move(paragraph));
paragraph_text.clear();
};
bool has_blank_lines = false;
bool has_trailing_blank_lines = false;
while (true) {
if (lines.is_end())
break;
if ((*lines).is_whitespace()) {
has_trailing_blank_lines = true;
++lines;
flush_paragraph();
continue;
} else {
has_blank_lines = has_blank_lines || has_trailing_blank_lines;
}
bool heading = false;
if ((heading = try_parse_block<Heading>(lines, blocks)))
current_section = dynamic_cast<Heading*>(blocks.last().ptr());
bool any = heading
|| try_parse_block<Table>(lines, blocks)
|| try_parse_block<HorizontalRule>(lines, blocks)
|| try_parse_block<List>(lines, blocks)
// CodeBlock needs to know the current section's name for proper indentation
|| try_parse_block<CodeBlock>(lines, blocks, current_section)
|| try_parse_block<CommentBlock>(lines, blocks)
|| try_parse_block<BlockQuote>(lines, blocks);
if (any) {
if (!paragraph_text.is_empty()) {
auto last_block = blocks.take_last();
flush_paragraph();
blocks.append(move(last_block));
}
continue;
}
if (!paragraph_text.is_empty())
paragraph_text.append('\n');
paragraph_text.append(*lines++);
}
flush_paragraph();
return make<ContainerBlock>(move(blocks), has_blank_lines, has_trailing_blank_lines);
}
}
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