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LibMarkdown: Parse horizontal rules

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A horizontal rule is generated by a line with three or more of these
characters: '*', '-', '_'.
This commit is contained in:
Andreas Kling 2021-01-02 02:39:18 +01:00
parent 888a93e0f6
commit 042890d319
4 changed files with 120 additions and 1 deletions
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69
Libraries/LibMarkdown/HorizontalRule.cpp Normal file
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/*
* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/String.h>
#include <AK/StringBuilder.h>
#include <LibMarkdown/HorizontalRule.h>
namespace Markdown {
String HorizontalRule::render_to_html() const
{
return "<hr>\n";
}
String HorizontalRule::render_for_terminal(size_t view_width) const
{
StringBuilder builder(view_width + 1);
for (size_t i = 0; i < view_width; ++i)
builder.append('-');
builder.append("\n\n");
return builder.to_string();
}
OwnPtr<HorizontalRule> HorizontalRule::parse(Vector<StringView>::ConstIterator& lines)
{
if (lines.is_end())
return nullptr;
const StringView& line = *lines;
if (line.length() < 3)
return nullptr;
if (!line.starts_with('-') && !line.starts_with('_') && !line.starts_with('*'))
return nullptr;
auto first_character = line.characters_without_null_termination()[0];
for (auto ch : line) {
if (ch != first_character)
return nullptr;
}
++lines;
return make<HorizontalRule>();
}
}