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/*
* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
* Copyright (c) 2022, Peter Elliott <pelliott@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/StringBuilder.h>
#include <LibJS/MarkupGenerator.h>
#include <LibMarkdown/CodeBlock.h>
#include <LibMarkdown/Visitor.h>
#include <LibRegex/Regex.h>
namespace Markdown {
String CodeBlock::render_to_html(bool) const
{
StringBuilder builder;
builder.append("<pre>");
if (m_style.length() >= 2)
builder.append("<strong>");
else if (m_style.length() >= 2)
builder.append("<em>");
if (m_language.is_empty())
builder.append("<code>");
else
builder.appendff("<code class=\"language-{}\">", escape_html_entities(m_language));
if (m_language == "js")
builder.append(JS::MarkupGenerator::html_from_source(m_code));
else
builder.append(escape_html_entities(m_code));
builder.append("</code>");
if (m_style.length() >= 2)
builder.append("</strong>");
else if (m_style.length() >= 2)
builder.append("</em>");
builder.append("</pre>\n");
return builder.build();
}
String CodeBlock::render_for_terminal(size_t) const
{
StringBuilder builder;
for (auto line : m_code.split('\n')) {
builder.append(" ");
builder.append(line);
builder.append("\n");
}
return builder.build();
}
RecursionDecision CodeBlock::walk(Visitor& visitor) const
{
RecursionDecision rd = visitor.visit(*this);
if (rd != RecursionDecision::Recurse)
return rd;
rd = visitor.visit(m_code);
if (rd != RecursionDecision::Recurse)
return rd;
// Don't recurse on m_language and m_style.
// Normalize return value.
return RecursionDecision::Continue;
}
static Regex<ECMA262> open_fence_re("^ {0,3}(([\\`\\~])\\2{2,})\\s*([\\*_]*)\\s*([^\\*_\\s]*).*$");
static Regex<ECMA262> close_fence_re("^ {0,3}(([\\`\\~])\\2{2,})\\s*$");
static Optional<int> line_block_prefix(StringView const& line)
{
int characters = 0;
int indents = 0;
for (char ch : line) {
if (indents == 4)
break;
if (ch == ' ') {
++characters;
++indents;
} else if (ch == '\t') {
++characters;
indents = 4;
} else {
break;
}
}
if (indents == 4)
return characters;
return {};
}
OwnPtr<CodeBlock> CodeBlock::parse(LineIterator& lines)
{
if (lines.is_end())
return {};
StringView line = *lines;
if (open_fence_re.match(line).success)
return parse_backticks(lines);
if (line_block_prefix(line).has_value())
return parse_indent(lines);
return {};
}
OwnPtr<CodeBlock> CodeBlock::parse_backticks(LineIterator& lines)
{
StringView line = *lines;
// Our Markdown extension: we allow
// specifying a style and a language
// for a code block, like so:
//
// ```**sh**
// $ echo hello friends!
// ````
//
// The code block will be made bold,
// and if possible syntax-highlighted
// as appropriate for a shell script.
auto matches = open_fence_re.match(line).capture_group_matches[0];
auto fence = matches[0].view.string_view();
auto style = matches[2].view.string_view();
auto language = matches[3].view.string_view();
++lines;
StringBuilder builder;
while (true) {
if (lines.is_end())
break;
line = *lines;
++lines;
auto close_match = close_fence_re.match(line);
if (close_match.success) {
auto close_fence = close_match.capture_group_matches[0][0].view.string_view();
if (close_fence[0] == fence[0] && close_fence.length() >= fence.length())
break;
}
builder.append(line);
builder.append('\n');
}
return make<CodeBlock>(language, style, builder.build());
}
OwnPtr<CodeBlock> CodeBlock::parse_indent(LineIterator& lines)
{
StringBuilder builder;
while (true) {
if (lines.is_end())
break;
StringView line = *lines;
auto prefix_length = line_block_prefix(line);
if (!prefix_length.has_value())
break;
line = line.substring_view(prefix_length.value());
++lines;
builder.append(line);
builder.append('\n');
}
return make<CodeBlock>("", "", builder.build());
}
}
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