152 lines
4.0 KiB
C++
152 lines
4.0 KiB
C++
#include "latex.h"
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#include "core/core.h"
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#include "core/formula.h"
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#include "core/macro.h"
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#include "fonts/fonts.h"
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#if CLATEX_CXX17
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#include <filesystem>
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#endif
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using namespace std;
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using namespace tex;
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string tex::RES_BASE = "res";
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static string CHECK_FILE = ".clatexmath-res_root";
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#ifdef _WIN32
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static char PATH_SEPERATOR = ';';
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#else
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static char PATH_SEPERATOR = ':';
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#endif
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Formula* LaTeX::_formula = nullptr;
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TeXRenderBuilder* LaTeX::_builder = nullptr;
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string LaTeX::queryResourceLocation(string& custom_path) {
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queue<string> paths;
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paths.push(custom_path);
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// checks if CLM_DEVEL exists. If it does, it pushes it to potential paths.
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char* devel = getenv("CLM_DEVEL");
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if (devel != NULL && *devel != '\0') {
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paths.push(string(devel));
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}
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// checks if XDG_DATA_HOME exists. If it does, it pushes it to potential paths.
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char* userdata = getenv("XDG_DATA_HOME");
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if (userdata != NULL && strcmp(userdata, "") != 0) {
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paths.push(string(userdata) + "/clatexmath/");
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}
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// checks if XDG_DATA_DIRS is set. If it is, it splits XDG_DATA_DIRS at : (or
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// ; on windows) and pushes each part of it to potential paths.
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char* xdg = getenv("XDG_DATA_DIRS");
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if (xdg != NULL && strcmp(xdg, "") != 0) {
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stringstream xdg_paths(xdg);
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string xdg_path;
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while (getline(xdg_paths, xdg_path, PATH_SEPERATOR)) {
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paths.push(xdg_path + "/clatexmath/");
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}
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}
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#ifndef _WIN32
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// checks if HOME env var is unset. if it isn't it pushes ~/.local/share/clatexmath
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// to potential paths.
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char* home = getenv("HOME");
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if (home != NULL && strcmp(home, "") != 0) {
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char* userdata_fallback;
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asprintf(&userdata_fallback, "%s/.local/share/clatexmath/", home);
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paths.push(string(userdata_fallback));
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delete userdata_fallback;
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}
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paths.push("/usr/share/clatexmath/");
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paths.push("/usr/local/share/clatexmath/");
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#endif
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// goes through the list of potential paths. if it finds a path that contains
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// .clatexmath-res_root, it returns it. Otherwise return an empty string.
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while (!paths.empty()) {
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#if CLATEX_CXX17
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filesystem::path p = paths.front();
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p.append(CHECK_FILE);
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if (filesystem::exists(p)) {
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p.remove_filename();
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return p.string();
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}
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#elif defined(_MSC_VER)
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std::string path = paths.front();
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std::string file = path + "/" + CHECK_FILE;
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FILE* fp = NULL;
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errno_t err = fopen_s(&fp, file.c_str(), "rb");
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if (err == 0 && fp) {
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fclose(fp);
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return path;
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}
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#else
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std::string path = paths.front();
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std::string file = path + "/" + CHECK_FILE;
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FILE* fp = fopen(file.c_str(), "rb");
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if (fp) {
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fclose(fp);
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return path;
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}
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#endif
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paths.pop();
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}
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return "";
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}
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void LaTeX::init(string res_root_path) {
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try {
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auto path = queryResourceLocation(res_root_path);
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if (!path.empty()) {
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RES_BASE = path;
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}
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} catch (std::exception&) {
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}
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if (_formula != nullptr) return;
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NewCommandMacro::_init_();
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DefaultTeXFont::_init_();
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Formula::_init_();
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TextRenderingBox::_init_();
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_formula = new Formula();
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_builder = new TeXRenderBuilder();
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}
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void LaTeX::release() {
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DefaultTeXFont::_free_();
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Formula::_free_();
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MacroInfo::_free_();
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NewCommandMacro::_free_();
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TextRenderingBox::_free_();
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if (_formula != nullptr) delete _formula;
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if (_builder != nullptr) delete _builder;
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}
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const string& LaTeX::getResRootPath() {
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return RES_BASE;
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}
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void LaTeX::setDebug(bool debug) {
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Formula::setDEBUG(debug);
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}
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TeXRender* LaTeX::parse(const wstring& latex, int width, float textSize, float lineSpace, color fg) {
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bool lined = true;
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// if (startswith(latex, L"$$") || startswith(latex, L"\\[")) {
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// lined = false;
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// }
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Alignment align = lined ? Alignment::left : Alignment::center;
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_formula->setLaTeX(latex);
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TeXRender* render =
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_builder->setStyle(TexStyle::display)
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.setTextSize(textSize)
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.setWidth(UnitType::pixel, width, align)
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.setIsMaxWidth(lined)
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.setLineSpace(UnitType::pixel, lineSpace)
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.setForeground(fg)
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.build(*_formula);
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return render;
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}
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