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/*
* Copyright (c) 2020, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Debug.h>
#include <AK/StringBuilder.h>
#include <LibMarkdown/Table.h>
namespace Markdown {
String Table::render_for_terminal(size_t view_width) const
{
auto unit_width_length = view_width == 0 ? 4 : ((float)(view_width - m_columns.size()) / (float)m_total_width);
StringBuilder builder;
auto write_aligned = [&](const auto& text, auto width, auto alignment) {
size_t original_length = 0;
for (auto& span : text.spans())
original_length += span.text.length();
auto string = text.render_for_terminal();
if (alignment == Alignment::Center) {
auto padding_length = (width - original_length) / 2;
// FIXME: We're using a StringView literal to bypass the compile-time AK::Format checking here, since it can't handle the "}}"
builder.appendff("{:{1}}"sv, "", (int)padding_length);
builder.append(string);
builder.appendff("{:{1}}"sv, "", (int)padding_length);
if ((width - original_length) % 2)
builder.append(' ');
} else {
// FIXME: We're using StringView literals to bypass the compile-time AK::Format checking here, since it can't handle the "}}"
builder.appendff(alignment == Alignment::Left ? "{:<{1}}"sv : "{:>{1}}"sv, string, (int)(width + (string.length() - original_length)));
}
};
bool first = true;
for (auto& col : m_columns) {
if (!first)
builder.append('|');
first = false;
size_t width = col.relative_width * unit_width_length;
write_aligned(col.header, width, col.alignment);
}
builder.append("\n");
for (size_t i = 0; i < view_width; ++i)
builder.append('-');
builder.append("\n");
for (size_t i = 0; i < m_row_count; ++i) {
bool first = true;
for (auto& col : m_columns) {
VERIFY(i < col.rows.size());
auto& cell = col.rows[i];
if (!first)
builder.append('|');
first = false;
size_t width = col.relative_width * unit_width_length;
write_aligned(cell, width, col.alignment);
}
builder.append("\n");
}
return builder.to_string();
}
String Table::render_to_html() const
{
StringBuilder builder;
builder.append("<table>");
builder.append("<thead>");
builder.append("<tr>");
for (auto& column : m_columns) {
builder.append("<th>");
builder.append(column.header.render_to_html());
builder.append("</th>");
}
builder.append("</tr>");
builder.append("</thead>");
builder.append("<tbody>");
for (size_t i = 0; i < m_row_count; ++i) {
builder.append("<tr>");
for (auto& column : m_columns) {
VERIFY(i < column.rows.size());
builder.append("<td>");
builder.append(column.rows[i].render_to_html());
builder.append("</td>");
}
builder.append("</tr>");
}
builder.append("</tbody>");
builder.append("</table>");
return builder.to_string();
}
OwnPtr<Table> Table::parse(Vector<StringView>::ConstIterator& lines)
{
auto peek_it = lines;
auto first_line = *peek_it;
if (!first_line.starts_with('|'))
return {};
++peek_it;
if (peek_it.is_end())
return {};
auto header_segments = first_line.split_view('|', true);
auto header_delimiters = peek_it->split_view('|', true);
if (!header_segments.is_empty())
header_segments.take_first();
if (!header_segments.is_empty() && header_segments.last().is_empty())
header_segments.take_last();
if (!header_delimiters.is_empty())
header_delimiters.take_first();
if (!header_delimiters.is_empty() && header_delimiters.last().is_empty())
header_delimiters.take_last();
++peek_it;
if (header_delimiters.size() != header_segments.size())
return {};
if (header_delimiters.is_empty())
return {};
size_t total_width = 0;
auto table = make<Table>();
table->m_columns.resize(header_delimiters.size());
for (size_t i = 0; i < header_segments.size(); ++i) {
auto text_option = Text::parse(header_segments[i]);
if (!text_option.has_value())
return {}; // An invalid 'text' in the header should just fail the table parse.
auto text = text_option.release_value();
auto& column = table->m_columns[i];
column.header = move(text);
auto delimiter = header_delimiters[i].trim_whitespace();
auto align_left = delimiter.starts_with(':');
auto align_right = delimiter != ":" && delimiter.ends_with(':');
if (align_left)
delimiter = delimiter.substring_view(1, delimiter.length() - 1);
if (align_right)
delimiter = delimiter.substring_view(0, delimiter.length() - 1);
if (align_left && align_right)
column.alignment = Alignment::Center;
else if (align_right)
column.alignment = Alignment::Right;
else
column.alignment = Alignment::Left;
size_t relative_width = delimiter.length();
for (auto ch : delimiter) {
if (ch != '-') {
dbgln_if(MARKDOWN_DEBUG, "Invalid character _{}_ in table heading delimiter (ignored)", ch);
--relative_width;
}
}
column.relative_width = relative_width;
total_width += relative_width;
}
table->m_total_width = total_width;
for (off_t i = 0; i < peek_it - lines; ++i)
++lines;
size_t row_count = 0;
++lines;
while (!lines.is_end()) {
auto& line = *lines;
if (!line.starts_with('|'))
break;
++lines;
auto segments = line.split_view('|', true);
segments.take_first();
if (!segments.is_empty() && segments.last().is_empty())
segments.take_last();
++row_count;
for (size_t i = 0; i < header_segments.size(); ++i) {
if (i >= segments.size()) {
// Ran out of segments, but still have headers.
// Just make an empty cell.
table->m_columns[i].rows.append(Text { "" });
} else {
auto text_option = Text::parse(segments[i]);
// We treat an invalid 'text' as a literal.
if (text_option.has_value()) {
auto text = text_option.release_value();
table->m_columns[i].rows.append(move(text));
} else {
table->m_columns[i].rows.append(Text { segments[i] });
}
}
}
}
table->m_row_count = row_count;
return table;
}
}
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