330 lines
10 KiB
C++
330 lines
10 KiB
C++
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#include "font_resolve.h"
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#include "file.h"
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#include "util.h"
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#include "error.h"
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#include "log.h"
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#include "show.h"
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#include "kutil.h"
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#include <algorithm>
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#include <regex>
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#include <sstream>
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#include <filesystem>
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namespace fs = std::filesystem;
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std::string name_to_dirname(std::string name)
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{
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std::string result {};
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for (char c : name) {
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if (c == ' ')
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result += '-';
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else
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result += std::tolower(c);
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}
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return result;
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}
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std::string name_to_google_query(std::string name)
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{
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std::string result {};
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for (char c : name) {
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if (c == ' ')
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result += '+';
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else
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result += c;
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}
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return result;
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}
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static void classify_from_css(Resolved_font& font, std::string css_path)
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{
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// Parse the @font-face blocks in the CSS to determine variant → filename mapping
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std::string css = string_from_file(css_path);
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std::regex face_rgx(
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R"(@font-face\s*\{[^}]*font-style:\s*(\w+);[^}]*font-weight:\s*(\w+);[^}]*url\('([^']+\.ttf)'\)[^}]*\})",
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std::regex::multiline);
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auto begin = std::sregex_iterator(css.begin(), css.end(), face_rgx);
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auto end = std::sregex_iterator();
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for (auto it = begin; it != end; ++it) {
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std::string style = (*it)[1];
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std::string weight = (*it)[2];
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std::string url_path = (*it)[3];
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// URL is like 'dir-name/Filename.ttf' — extract just the filename
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std::string filename = url_path.substr(url_path.rfind('/') + 1);
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bool is_bold = (weight == "700" || weight == "bold");
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bool is_italic = (style == "italic" || style == "oblique");
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if (is_bold && is_italic)
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font.bold_italic = filename;
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else if (is_bold)
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font.bold = filename;
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else if (is_italic)
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font.italic = filename;
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else
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font.regular = filename;
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}
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}
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static Resolved_font resolve_bundled(std::string family_name, std::string dir_name)
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{
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std::string bundled_dir = klammertext_dir() + "/sks/font/fonts/" + dir_name;
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std::string bundled_css = bundled_dir + ".css";
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if (fs::exists(bundled_dir) && fs::exists(bundled_css)) {
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Resolved_font font {};
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font.family_name = family_name;
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font.dir_name = dir_name;
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font.font_dir = bundled_dir;
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font.css_file = bundled_css;
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font.from_cache = false;
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classify_from_css(font, bundled_css);
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return font;
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}
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return {};
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}
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static Resolved_font resolve_cached(std::string family_name, std::string dir_name)
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{
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std::string cache_base = cache_directory("_fonts");
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std::string cache_dir = cache_base + "/" + dir_name;
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std::string cache_css = cache_base + "/" + dir_name + ".css";
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if (fs::exists(cache_dir) && fs::exists(cache_css)) {
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Resolved_font font {};
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font.family_name = family_name;
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font.dir_name = dir_name;
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font.font_dir = cache_dir;
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font.css_file = cache_css;
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font.from_cache = true;
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classify_from_css(font, cache_css);
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return font;
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}
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return {};
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}
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static Resolved_font fetch_google_font(std::string family_name, std::string dir_name)
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{
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(void)K::log(1, "Fetching font \"" + family_name + "\" from Google Fonts");
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std::string query = name_to_google_query(family_name);
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std::string url =
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"https://fonts.googleapis.com/css2?family=" + query +
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":ital,wght@0,400;0,700;1,400;1,700&display=swap";
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std::string cmd = "curl -s -H 'User-Agent: Mozilla/4.0' '" + url + "'";
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std::string css_response = exec(cmd.c_str());
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if (css_response.empty() || css_response.find("@font-face") == std::string::npos) {
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return {};
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}
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// Parse @font-face blocks to extract style, weight, and .ttf URL
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struct Font_variant {
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std::string style; // "normal" or "italic"
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std::string weight; // "400" or "700"
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std::string url;
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};
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std::vector<Font_variant> variants {};
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std::regex face_rgx(
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R"(@font-face\s*\{[^}]*font-style:\s*(\w+);[^}]*font-weight:\s*(\d+);[^}]*src:\s*url\((https?://[^)]+\.ttf)\)[^}]*\})",
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std::regex::multiline);
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auto begin = std::sregex_iterator(css_response.begin(), css_response.end(), face_rgx);
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auto end = std::sregex_iterator();
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for (auto it = begin; it != end; ++it) {
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Font_variant v {};
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v.style = (*it)[1];
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v.weight = (*it)[2];
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v.url = (*it)[3];
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variants.push_back(v);
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}
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if (variants.empty()) {
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return {};
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}
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// Create cache directory
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std::string cache_base = cache_directory("_fonts");
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if (!fs::exists(cache_base))
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fs::create_directories(cache_base);
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std::string cache_dir = cache_base + "/" + dir_name;
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if (!fs::exists(cache_dir))
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fs::create_directory(cache_dir);
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Resolved_font font {};
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font.family_name = family_name;
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font.dir_name = dir_name;
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font.font_dir = cache_dir;
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font.from_cache = true;
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// Download each .ttf file with descriptive names
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for (auto& v : variants) {
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std::string local_name;
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if (v.style == "normal" && v.weight == "400")
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local_name = "Regular.ttf";
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else if (v.style == "normal" && v.weight == "700")
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local_name = "Bold.ttf";
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else if (v.style == "italic" && v.weight == "400")
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local_name = "Italic.ttf";
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else if (v.style == "italic" && v.weight == "700")
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local_name = "BoldItalic.ttf";
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else
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continue;
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std::string ttf_path = cache_dir + "/" + local_name;
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if (!fs::exists(ttf_path)) {
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std::string dl_cmd = "curl -s -o '" + ttf_path + "' '" + v.url + "'";
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(void)exec(dl_cmd.c_str());
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if (!fs::exists(ttf_path)) {
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(void)K::log(1, "Failed to download font file: " + v.url);
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continue;
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}
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}
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if (local_name == "Regular.ttf")
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font.regular = local_name;
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else if (local_name == "Bold.ttf")
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font.bold = local_name;
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else if (local_name == "Italic.ttf")
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font.italic = local_name;
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else if (local_name == "BoldItalic.ttf")
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font.bold_italic = local_name;
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}
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// Generate @font-face CSS file
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std::string css_file = cache_base + "/" + dir_name + ".css";
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std::stringstream css {};
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auto emit_face = [&](std::string style, std::string weight, std::string filename) {
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if (filename.empty())
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return;
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css << "\n@font-face {\n"
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<< " font-family: '" << family_name << "';\n"
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<< " font-style: " << style << ";\n"
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<< " font-weight: " << weight << ";\n"
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<< " src: url('" << dir_name << "/" << filename << "') format('truetype');\n"
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<< "}\n";
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};
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emit_face("normal", "400", font.regular);
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emit_face("normal", "700", font.bold);
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emit_face("italic", "400", font.italic);
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emit_face("italic", "700", font.bold_italic);
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string_to_file(css_file, css.str());
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font.css_file = css_file;
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return font;
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}
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static void extract_font_metrics(Resolved_font& font)
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{
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if (font.regular.empty() || font.font_dir.empty())
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return;
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std::string ttf_path = font.font_dir + "/" + font.regular;
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if (!fs::exists(ttf_path))
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return;
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// Extract both x-height and cap-height ratios from OS/2 table
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std::string script =
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"python3 -c \""
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"import struct; "
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"f = open('" + ttf_path + "', 'rb'); "
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"_, n = struct.unpack('>IH', f.read(6)); "
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"f.read(6); "
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"t = {};\n"
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"for _ in range(n):\n"
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" tag = f.read(4).decode('latin-1').strip('\\\\x00'); "
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" _, o, l = struct.unpack('>III', f.read(12)); "
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" t[tag] = o\n"
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"f.seek(t['head'] + 18); "
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"upm = struct.unpack('>H', f.read(2))[0]; "
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"f.seek(t['OS/2']); "
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"ver = struct.unpack('>H', f.read(2))[0]; "
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"f.seek(t['OS/2'] + 86); "
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"xh, ch = struct.unpack('>hh', f.read(4)); "
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"print(f'{xh/upm:.4f} {ch/upm:.4f}') if ver >= 2 else None; "
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"f.close()\"";
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std::string result = trim(exec(script.c_str()));
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if (!result.empty()) {
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try {
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auto pos = result.find(' ');
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if (pos != std::string::npos) {
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font.xheight_ratio = std::stof(result.substr(0, pos));
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font.capheight_ratio = std::stof(result.substr(pos + 1));
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}
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} catch (...) {}
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}
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}
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Resolved_font resolve_font(std::string family_name)
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{
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if (family_name.empty())
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return {};
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std::string dir_name = name_to_dirname(family_name);
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// 1. Check bundled fonts
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Resolved_font font = resolve_bundled(family_name, dir_name);
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if (!font.family_name.empty()) {
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extract_font_metrics(font);
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return font;
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}
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// 2. Check font cache
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font = resolve_cached(family_name, dir_name);
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if (!font.family_name.empty()) {
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extract_font_metrics(font);
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return font;
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}
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// 3. Fetch from Google Fonts
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font = fetch_google_font(family_name, dir_name);
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if (!font.family_name.empty()) {
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extract_font_metrics(font);
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return font;
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}
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// 4. Error
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throw Argument_error(
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"Font \"" + family_name + "\" not found.\n"
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" Not bundled in sks/font/fonts/" + dir_name + "/,\n"
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" not cached, and not available from Google Fonts.\n"
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" Check the font name or install it locally.");
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}
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// Font assets are copied with copy_file_stream() (mac/file.h) rather than
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// std::filesystem::copy_file, which fails on Apple `container` virtiofs mounts
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// — see the note on copy_file_stream() in file.cpp for the full rationale.
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void install_resolved_font(const Resolved_font& font, std::string output_dir)
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{
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if (font.family_name.empty())
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return;
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std::string output_font_dir = output_dir + "/fonts";
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if (!fs::exists(output_font_dir))
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fs::create_directory(output_font_dir);
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// Copy .css file and font directory to output
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std::string dest_css = output_font_dir + "/" + font.dir_name + ".css";
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std::string dest_dir = output_font_dir + "/" + font.dir_name;
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copy_file_stream(font.css_file, dest_css);
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if (!fs::exists(dest_dir)) {
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fs::create_directory(dest_dir);
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for (auto& entry : fs::directory_iterator(font.font_dir)) {
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copy_file_stream(entry.path(),
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dest_dir + "/" + entry.path().filename().string());
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}
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}
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}
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