125 lines
2.7 KiB
C++
125 lines
2.7 KiB
C++
/*
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* This project is licensed under the MIT license. For more information see the
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* LICENSE file.
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*/
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#pragma once
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// -----------------------------------------------------------------------------
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#include <functional>
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#include <regex>
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#include <string>
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#include "maddy/blockparser.h"
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// -----------------------------------------------------------------------------
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namespace maddy {
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// -----------------------------------------------------------------------------
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/**
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* LatexBlockParser
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*
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* Support for https://www.mathjax.org/
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* Be aware, that if you want to make MathJax work, you need also their
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* JavaScript library added to your HTML code.
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* maddy does not itself add that code to be more flexible in how you write your
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* head and full body.
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*
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* From Markdown: `$$` surrounded text
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*
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* ```
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* $$some formula
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* $$
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* ```
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*
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* To HTML:
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*
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* ```
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* $$some formula
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* $$
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* ```
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*
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* @class
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*/
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class LatexBlockParser : public BlockParser
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{
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public:
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/**
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* ctor
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*
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* @method
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* @param {std::function<void(std::string&)>} parseLineCallback
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* @param {std::function<std::shared_ptr<BlockParser>(const std::string&
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* line)>} getBlockParserForLineCallback
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*/
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LatexBlockParser(
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std::function<void(std::string&)> parseLineCallback,
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std::function<std::shared_ptr<BlockParser>(const std::string& line)>
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getBlockParserForLineCallback
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)
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: BlockParser(parseLineCallback, getBlockParserForLineCallback)
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, isStarted(false)
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, isFinished(false)
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{}
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/**
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* IsStartingLine
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*
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* If the line starts with two dollars, then it is a latex block.
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*
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* ```
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* $$
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* ```
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*
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* @method
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* @param {const std::string&} line
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* @return {bool}
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*/
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static bool IsStartingLine(const std::string& line)
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{
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static std::regex re(R"(^(?:\$){2}(.*)$)");
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return std::regex_match(line, re);
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}
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/**
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* IsFinished
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*
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* @method
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* @return {bool}
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*/
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bool IsFinished() const override { return this->isFinished; }
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protected:
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bool isInlineBlockAllowed() const override { return false; }
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bool isLineParserAllowed() const override { return false; }
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void parseBlock(std::string& line) override
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{
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if (!this->isStarted && line.substr(0, 2) == "$$")
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{
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this->isStarted = true;
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this->isFinished = false;
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}
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if (this->isStarted && !this->isFinished && line.size() > 1 &&
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line.substr(line.size() - 2, 2) == "$$")
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{
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this->isFinished = true;
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this->isStarted = false;
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}
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line += "\n";
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}
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private:
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bool isStarted;
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bool isFinished;
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}; // class LatexBlockParser
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// -----------------------------------------------------------------------------
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} // namespace maddy
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