mirror of
https://github.com/LadybirdBrowser/ladybird.git
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239 lines
7.7 KiB
C++
239 lines
7.7 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/StringBuilder.h>
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#include <LibMarkdown/Table.h>
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namespace Markdown {
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String Table::render_for_terminal(size_t view_width) const
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{
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auto unit_width_length = view_width == 0 ? 4 : ((float)(view_width - m_columns.size()) / (float)m_total_width);
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StringBuilder builder;
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auto write_aligned = [&](const auto& text, auto width, auto alignment) {
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size_t original_length = 0;
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for (auto& span : text.spans())
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original_length += span.text.length();
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auto string = text.render_for_terminal();
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if (alignment == Alignment::Center) {
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auto padding_length = (width - original_length) / 2;
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builder.appendf("%*s%s%*s", (int)padding_length, "", string.characters(), (int)padding_length, "");
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if ((width - original_length) % 2)
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builder.append(' ');
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} else {
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builder.appendf(alignment == Alignment::Left ? "%-*s" : "%*s", (int)(width + (string.length() - original_length)), string.characters());
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}
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};
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bool first = true;
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for (auto& col : m_columns) {
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if (!first)
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builder.append('|');
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first = false;
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size_t width = col.relative_width * unit_width_length;
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write_aligned(col.header, width, col.alignment);
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}
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builder.append("\n");
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for (size_t i = 0; i < view_width; ++i)
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builder.append('-');
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builder.append("\n");
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for (size_t i = 0; i < m_row_count; ++i) {
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bool first = true;
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for (auto& col : m_columns) {
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ASSERT(i < col.rows.size());
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auto& cell = col.rows[i];
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if (!first)
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builder.append('|');
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first = false;
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size_t width = col.relative_width * unit_width_length;
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write_aligned(cell, width, col.alignment);
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}
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builder.append("\n");
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}
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return builder.to_string();
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}
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String Table::render_to_html() const
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{
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StringBuilder builder;
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builder.append("<table>");
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builder.append("<thead>");
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builder.append("<tr>");
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for (auto& column : m_columns) {
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builder.append("<th>");
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builder.append(column.header.render_to_html());
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builder.append("</th>");
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}
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builder.append("</tr>");
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builder.append("</thead>");
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builder.append("<tbody>");
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for (size_t i = 0; i < m_row_count; ++i) {
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builder.append("<tr>");
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for (auto& column : m_columns) {
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ASSERT(i < column.rows.size());
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builder.append("<td>");
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builder.append(column.rows[i].render_to_html());
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builder.append("</td>");
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}
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builder.append("</tr>");
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}
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builder.append("</tbody>");
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builder.append("</table>");
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return builder.to_string();
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}
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OwnPtr<Table> Table::parse(Vector<StringView>::ConstIterator& lines)
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{
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auto peek_it = lines;
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auto first_line = *peek_it;
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if (!first_line.starts_with('|'))
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return {};
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++peek_it;
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if (peek_it.is_end())
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return {};
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auto header_segments = first_line.split_view('|', true);
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auto header_delimiters = peek_it->split_view('|', true);
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if (!header_segments.is_empty())
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header_segments.take_first();
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if (!header_segments.is_empty() && header_segments.last().is_empty())
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header_segments.take_last();
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if (!header_delimiters.is_empty())
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header_delimiters.take_first();
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if (!header_delimiters.is_empty() && header_delimiters.last().is_empty())
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header_delimiters.take_last();
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++peek_it;
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if (header_delimiters.size() != header_segments.size())
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return {};
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if (header_delimiters.is_empty())
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return {};
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size_t total_width = 0;
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auto table = make<Table>();
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table->m_columns.resize(header_delimiters.size());
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for (size_t i = 0; i < header_segments.size(); ++i) {
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auto text_option = Text::parse(header_segments[i]);
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if (!text_option.has_value())
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return {}; // An invalid 'text' in the header should just fail the table parse.
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auto text = text_option.release_value();
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auto& column = table->m_columns[i];
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column.header = move(text);
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auto delimiter = header_delimiters[i].trim_whitespace();
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auto align_left = delimiter.starts_with(':');
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auto align_right = delimiter != ":" && delimiter.ends_with(':');
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if (align_left)
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delimiter = delimiter.substring_view(1, delimiter.length() - 1);
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if (align_right)
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delimiter = delimiter.substring_view(0, delimiter.length() - 1);
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if (align_left && align_right)
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column.alignment = Alignment::Center;
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else if (align_right)
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column.alignment = Alignment::Right;
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else
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column.alignment = Alignment::Left;
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size_t relative_width = delimiter.length();
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for (auto ch : delimiter) {
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if (ch != '-') {
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#ifdef DEBUG_MARKDOWN
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dbg() << "Invalid character _" << ch << "_ in table heading delimiter (ignored)";
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#endif
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--relative_width;
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}
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}
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column.relative_width = relative_width;
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total_width += relative_width;
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}
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table->m_total_width = total_width;
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for (off_t i = 0; i < peek_it - lines; ++i)
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++lines;
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size_t row_count = 0;
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++lines;
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while (!lines.is_end()) {
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auto& line = *lines;
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if (!line.starts_with('|'))
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break;
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++lines;
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auto segments = line.split_view('|', true);
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segments.take_first();
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if (!segments.is_empty() && segments.last().is_empty())
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segments.take_last();
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++row_count;
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for (size_t i = 0; i < header_segments.size(); ++i) {
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if (i >= segments.size()) {
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// Ran out of segments, but still have headers.
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// Just make an empty cell.
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table->m_columns[i].rows.append(Text { "" });
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} else {
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auto text_option = Text::parse(segments[i]);
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// We treat an invalid 'text' as a literal.
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if (text_option.has_value()) {
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auto text = text_option.release_value();
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table->m_columns[i].rows.append(move(text));
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} else {
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table->m_columns[i].rows.append(Text { segments[i] });
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}
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}
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}
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}
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table->m_row_count = row_count;
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return move(table);
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}
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}
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