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LibMarkdown: Add blockquote support to LineIterator

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This patch adds contexts to line iterator for nesting list items and
blockquotes. It also incidentally makes the api for LineIterator
simpler, and will make it easier to add other containers in the future.
This commit is contained in:
Peter Elliott 2021-10-03 21:45:10 -06:00 • committed by Andreas Kling
parent 4b091a7cc2
commit 2227a80f34
3 changed files with 79 additions and 32 deletions
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58
Userland/Libraries/LibMarkdown/LineIterator.cpp
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@ -4,38 +4,62 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Format.h>
#include <LibMarkdown/LineIterator.h>
namespace Markdown {
bool LineIterator::is_indented(StringView const& line) const
void LineIterator::reset_ignore_prefix()
{
if (line.is_whitespace())
return true;
if (line.length() < m_indent)
return false;
for (size_t i = 0; i < m_indent; ++i) {
if (line[i] != ' ')
return false;
for (auto& context : m_context_stack) {
context.ignore_prefix = false;
}
}
return true;
Optional<StringView> LineIterator::match_context(StringView const& line) const
{
bool is_ws = line.is_whitespace();
size_t offset = 0;
for (auto& context : m_context_stack) {
switch (context.type) {
case Context::Type::ListItem:
if (is_ws)
break;
if (offset + context.indent > line.length())
return {};
if (!context.ignore_prefix && !line.substring_view(offset, context.indent).is_whitespace())
return {};
offset += context.indent;
break;
case Context::Type::BlockQuote:
for (; offset < line.length() && line[offset] == ' '; ++offset) { }
if (offset >= line.length() || line[offset] != '>') {
return {};
}
++offset;
break;
}
if (offset > line.length())
return {};
}
return line.substring_view(offset);
}
bool LineIterator::is_end() const
{
return m_iterator.is_end() || (!m_ignore_prefix_mode && !is_indented(*m_iterator));
return m_iterator.is_end() || !match_context(*m_iterator).has_value();
}
StringView LineIterator::operator*() const
{
VERIFY(m_ignore_prefix_mode || is_indented(*m_iterator));
if (m_iterator->is_whitespace())
return *m_iterator;
return m_iterator->substring_view(m_indent);
auto line = match_context(*m_iterator);
VERIFY(line.has_value());
return line.value();
}
}