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feat: Add newspaper-style text rendering engine
Implement text renderer with adaptive layout: - Adaptive width with maximum 80 characters - Center-aligned content for comfortable reading - Smart text wrapping and paragraph spacing - Color scheme optimized for terminal reading - Support for headings, paragraphs, lists, and links - Link indicators with numbering - Horizontal rules and visual separators The renderer creates a newspaper-like reading experience optimized for terminal displays.
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300
src/text_renderer.cpp
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300
src/text_renderer.cpp
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#include "text_renderer.h"
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#include <sstream>
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#include <algorithm>
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#include <clocale>
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class TextRenderer::Impl {
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public:
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RenderConfig config;
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// 自动换行处理
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std::vector<std::string> wrap_text(const std::string& text, int width) {
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std::vector<std::string> lines;
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if (text.empty()) {
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return lines;
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}
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std::istringstream words_stream(text);
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std::string word;
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std::string current_line;
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while (words_stream >> word) {
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// 处理单个词超长的情况
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if (word.length() > static_cast<size_t>(width)) {
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if (!current_line.empty()) {
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lines.push_back(current_line);
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current_line.clear();
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}
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// 强制分割长词
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for (size_t i = 0; i < word.length(); i += width) {
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lines.push_back(word.substr(i, width));
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}
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continue;
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}
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// 正常换行逻辑
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if (current_line.empty()) {
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current_line = word;
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} else if (current_line.length() + 1 + word.length() <= static_cast<size_t>(width)) {
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current_line += " " + word;
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} else {
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lines.push_back(current_line);
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current_line = word;
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}
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}
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if (!current_line.empty()) {
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lines.push_back(current_line);
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}
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if (lines.empty()) {
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lines.push_back("");
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}
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return lines;
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}
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// 添加缩进
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std::string add_indent(const std::string& text, int indent) {
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return std::string(indent, ' ') + text;
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}
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};
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TextRenderer::TextRenderer() : pImpl(std::make_unique<Impl>()) {
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pImpl->config = RenderConfig();
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}
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TextRenderer::~TextRenderer() = default;
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std::vector<RenderedLine> TextRenderer::render(const ParsedDocument& doc, int screen_width) {
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std::vector<RenderedLine> lines;
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// 计算实际内容宽度
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int content_width = std::min(pImpl->config.max_width, screen_width - 4);
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if (content_width < 40) {
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content_width = screen_width - 4;
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}
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// 计算左边距（如果居中）
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int margin = 0;
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if (pImpl->config.center_content && content_width < screen_width) {
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margin = (screen_width - content_width) / 2;
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}
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pImpl->config.margin_left = margin;
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// 渲染标题
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if (!doc.title.empty()) {
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RenderedLine title_line;
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title_line.text = std::string(margin, ' ') + doc.title;
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title_line.color_pair = COLOR_HEADING1;
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title_line.is_bold = true;
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title_line.is_link = false;
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title_line.link_index = -1;
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lines.push_back(title_line);
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// 标题下划线
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RenderedLine underline;
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underline.text = std::string(margin, ' ') + std::string(std::min((int)doc.title.length(), content_width), '=');
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underline.color_pair = COLOR_HEADING1;
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underline.is_bold = false;
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underline.is_link = false;
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underline.link_index = -1;
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lines.push_back(underline);
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// 空行
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RenderedLine empty;
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empty.text = "";
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empty.color_pair = COLOR_NORMAL;
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empty.is_bold = false;
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empty.is_link = false;
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empty.link_index = -1;
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lines.push_back(empty);
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}
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// 渲染URL
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if (!doc.url.empty()) {
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RenderedLine url_line;
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url_line.text = std::string(margin, ' ') + "URL: " + doc.url;
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url_line.color_pair = COLOR_URL_BAR;
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url_line.is_bold = false;
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url_line.is_link = false;
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url_line.link_index = -1;
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lines.push_back(url_line);
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RenderedLine empty;
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empty.text = "";
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empty.color_pair = COLOR_NORMAL;
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empty.is_bold = false;
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empty.is_link = false;
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empty.link_index = -1;
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lines.push_back(empty);
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}
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// 渲染内容元素
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for (const auto& elem : doc.elements) {
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int color = COLOR_NORMAL;
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bool bold = false;
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std::string prefix = "";
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switch (elem.type) {
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case ElementType::HEADING1:
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color = COLOR_HEADING1;
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bold = true;
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prefix = "# ";
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break;
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case ElementType::HEADING2:
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color = COLOR_HEADING2;
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bold = true;
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prefix = "## ";
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break;
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case ElementType::HEADING3:
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color = COLOR_HEADING3;
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bold = true;
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prefix = "### ";
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break;
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case ElementType::PARAGRAPH:
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color = COLOR_NORMAL;
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bold = false;
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break;
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case ElementType::BLOCKQUOTE:
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color = COLOR_DIM;
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prefix = "> ";
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break;
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case ElementType::LIST_ITEM:
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prefix = " • ";
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break;
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case ElementType::HORIZONTAL_RULE:
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{
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RenderedLine hr;
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std::string hrline(content_width, '-');
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hr.text = std::string(margin, ' ') + hrline;
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hr.color_pair = COLOR_DIM;
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hr.is_bold = false;
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hr.is_link = false;
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hr.link_index = -1;
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lines.push_back(hr);
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continue;
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}
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default:
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break;
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}
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// 换行处理
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auto wrapped_lines = pImpl->wrap_text(elem.text, content_width - prefix.length());
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for (size_t i = 0; i < wrapped_lines.size(); ++i) {
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RenderedLine line;
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if (i == 0) {
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line.text = std::string(margin, ' ') + prefix + wrapped_lines[i];
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} else {
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line.text = std::string(margin + prefix.length(), ' ') + wrapped_lines[i];
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}
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line.color_pair = color;
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line.is_bold = bold;
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line.is_link = false;
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line.link_index = -1;
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lines.push_back(line);
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}
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// 段落间距
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if (elem.type == ElementType::PARAGRAPH ||
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elem.type == ElementType::HEADING1 ||
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elem.type == ElementType::HEADING2 ||
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elem.type == ElementType::HEADING3) {
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for (int i = 0; i < pImpl->config.paragraph_spacing; ++i) {
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RenderedLine empty;
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empty.text = "";
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empty.color_pair = COLOR_NORMAL;
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empty.is_bold = false;
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empty.is_link = false;
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empty.link_index = -1;
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lines.push_back(empty);
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}
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}
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}
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// 渲染链接列表
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if (!doc.links.empty() && pImpl->config.show_link_indicators) {
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RenderedLine separator;
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std::string sepline(content_width, '-');
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separator.text = std::string(margin, ' ') + sepline;
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separator.color_pair = COLOR_DIM;
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separator.is_bold = false;
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separator.is_link = false;
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separator.link_index = -1;
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lines.push_back(separator);
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RenderedLine links_header;
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links_header.text = std::string(margin, ' ') + "Links:";
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links_header.color_pair = COLOR_HEADING3;
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links_header.is_bold = true;
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links_header.is_link = false;
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links_header.link_index = -1;
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lines.push_back(links_header);
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RenderedLine empty;
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empty.text = "";
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empty.color_pair = COLOR_NORMAL;
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empty.is_bold = false;
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empty.is_link = false;
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empty.link_index = -1;
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lines.push_back(empty);
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for (size_t i = 0; i < doc.links.size(); ++i) {
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const auto& link = doc.links[i];
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std::string link_text = "[" + std::to_string(i) + "] " + link.text;
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auto wrapped = pImpl->wrap_text(link_text, content_width - 4);
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for (size_t j = 0; j < wrapped.size(); ++j) {
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RenderedLine link_line;
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link_line.text = std::string(margin + 2, ' ') + wrapped[j];
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link_line.color_pair = COLOR_LINK;
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link_line.is_bold = false;
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link_line.is_link = true;
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link_line.link_index = i;
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lines.push_back(link_line);
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}
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// URL on next line
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auto url_wrapped = pImpl->wrap_text(link.url, content_width - 6);
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for (const auto& url_line_text : url_wrapped) {
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RenderedLine url_line;
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url_line.text = std::string(margin + 4, ' ') + "→ " + url_line_text;
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url_line.color_pair = COLOR_DIM;
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url_line.is_bold = false;
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url_line.is_link = false;
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url_line.link_index = -1;
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lines.push_back(url_line);
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}
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lines.push_back(empty);
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}
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}
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return lines;
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}
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void TextRenderer::set_config(const RenderConfig& config) {
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pImpl->config = config;
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}
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RenderConfig TextRenderer::get_config() const {
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return pImpl->config;
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}
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void init_color_scheme() {
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if (has_colors()) {
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start_color();
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use_default_colors();
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init_pair(COLOR_NORMAL, COLOR_WHITE, -1);
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init_pair(COLOR_HEADING1, COLOR_CYAN, -1);
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init_pair(COLOR_HEADING2, COLOR_BLUE, -1);
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init_pair(COLOR_HEADING3, COLOR_MAGENTA, -1);
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init_pair(COLOR_LINK, COLOR_YELLOW, -1);
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init_pair(COLOR_LINK_ACTIVE, COLOR_BLACK, COLOR_YELLOW);
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init_pair(COLOR_STATUS_BAR, COLOR_BLACK, COLOR_WHITE);
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init_pair(COLOR_URL_BAR, COLOR_GREEN, -1);
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init_pair(COLOR_SEARCH_HIGHLIGHT, COLOR_BLACK, COLOR_YELLOW);
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init_pair(COLOR_DIM, COLOR_BLACK, -1);
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}
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}
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60
src/text_renderer.h
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src/text_renderer.h
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#pragma once
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#include "html_parser.h"
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#include <string>
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#include <vector>
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#include <curses.h>
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// 渲染后的行信息
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struct RenderedLine {
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std::string text;
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int color_pair;
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bool is_bold;
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bool is_link;
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int link_index; // 如果是链接，对应的链接索引
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};
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// 渲染配置
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struct RenderConfig {
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int max_width = 80; // 内容最大宽度
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int margin_left = 0; // 左边距（居中时自动计算）
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bool center_content = true; // 是否居中内容
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int paragraph_spacing = 1; // 段落间距
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bool show_link_indicators = true; // 是否显示链接指示器
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};
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class TextRenderer {
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public:
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TextRenderer();
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~TextRenderer();
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// 渲染文档到行数组
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std::vector<RenderedLine> render(const ParsedDocument& doc, int screen_width);
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// 设置渲染配置
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void set_config(const RenderConfig& config);
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// 获取当前配置
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RenderConfig get_config() const;
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private:
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class Impl;
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std::unique_ptr<Impl> pImpl;
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};
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// 颜色定义
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enum ColorScheme {
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COLOR_NORMAL = 1,
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COLOR_HEADING1,
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COLOR_HEADING2,
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COLOR_HEADING3,
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COLOR_LINK,
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COLOR_LINK_ACTIVE,
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COLOR_STATUS_BAR,
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COLOR_URL_BAR,
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COLOR_SEARCH_HIGHLIGHT,
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COLOR_DIM
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};
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// 初始化颜色方案
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void init_color_scheme();
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