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/*
* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@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("\n</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;
builder.append(m_code);
builder.append("\n\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> style_spec_re("\\s*([\\*_]*)\\s*([^\\*_\\s]*).*");
OwnPtr<CodeBlock> CodeBlock::parse(LineIterator& lines)
{
if (lines.is_end())
return {};
constexpr auto tick_tick_tick = "```";
StringView line = *lines;
if (!line.starts_with(tick_tick_tick))
return {};
// 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.
StringView style_spec = line.substring_view(3, line.length() - 3);
auto matches = style_spec_re.match(style_spec);
auto style = matches.capture_group_matches[0][0].view.string_view();
auto language = matches.capture_group_matches[0][1].view.string_view();
++lines;
bool first = true;
StringBuilder builder;
while (true) {
if (lines.is_end())
break;
line = *lines;
++lines;
if (line == tick_tick_tick)
break;
if (!first)
builder.append('\n');
builder.append(line);
first = false;
}
return make<CodeBlock>(language, style, builder.build());
}
}
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