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LibMarkdown: Add support for indented code blocks

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This commit is contained in:
Peter Elliott 2022-04-21 23:34:09 -06:00 • committed by Andreas Kling
parent dbb2347000
commit 0270e23997
2 changed files with 69 additions and 4 deletions
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70
Userland/Libraries/LibMarkdown/CodeBlock.cpp
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
* Copyright (c) 2022, Peter Elliott <pelliott@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -76,16 +77,52 @@ RecursionDecision CodeBlock::walk(Visitor& visitor) const
static Regex<ECMA262> style_spec_re("\\s*([\\*_]*)\\s*([^\\*_\\s]*).*");
static constexpr auto tick_tick_tick = "```";
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 {};
constexpr auto tick_tick_tick = "```";
StringView line = *lines;
if (!line.starts_with(tick_tick_tick))
return {};
if (line.starts_with(tick_tick_tick))
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
@ -124,4 +161,29 @@ OwnPtr<CodeBlock> CodeBlock::parse(LineIterator& lines)
return make<CodeBlock>(language, style, builder.build());
}
OwnPtr<CodeBlock> CodeBlock::parse_indent(LineIterator& lines)
{
bool first = true;
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;
if (!first)
builder.append('\n');
builder.append(line);
first = false;
}
return make<CodeBlock>("", "", builder.build());
}
}