鏡像自
https://github.com/quitesimpleorg/qsmaddy.git
synced 2024-12-22 11:19:49 +01:00
204 行
4.0 KiB
C++
204 行
4.0 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 <sstream>
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#include <string>
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// windows compatibility includes
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#include <cctype>
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#include <algorithm>
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// -----------------------------------------------------------------------------
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namespace maddy {
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// -----------------------------------------------------------------------------
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/**
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* BlockParser
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*
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* The code expects every child to have the following static function to be
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* implemented:
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* `static bool IsStartingLine(const std::string& line)`
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*
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* @class
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*/
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class 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& line)>} getBlockParserForLineCallback
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*/
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BlockParser(
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std::function<void(std::string&)> parseLineCallback,
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std::function<std::shared_ptr<BlockParser>(const std::string& line)> getBlockParserForLineCallback
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)
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: result("", std::ios_base::ate | std::ios_base::in | std::ios_base::out)
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, childParser(nullptr)
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, parseLineCallback(parseLineCallback)
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, getBlockParserForLineCallback(getBlockParserForLineCallback)
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{}
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/**
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* dtor
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*
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* @method
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*/
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virtual ~BlockParser() {}
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/**
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* AddLine
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*
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* Adding a line which has to be parsed.
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*
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* @method
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* @param {std::string&} line
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* @return {void}
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*/
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virtual void
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AddLine(std::string& line)
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{
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this->parseBlock(line);
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if (this->isInlineBlockAllowed() && !this->childParser)
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{
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this->childParser = this->getBlockParserForLine(line);
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}
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if (this->childParser)
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{
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this->childParser->AddLine(line);
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if (this->childParser->IsFinished())
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{
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this->result << this->childParser->GetResult().str();
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this->childParser = nullptr;
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}
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return;
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}
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if (this->isLineParserAllowed())
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{
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this->parseLine(line);
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}
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this->result << line;
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}
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/**
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* IsFinished
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*
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* Check if the BlockParser is done
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*
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* @method
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* @return {bool}
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*/
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virtual bool IsFinished() const = 0;
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/**
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* GetResult
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*
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* Get the parsed HTML output.
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*
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* @method
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* @return {std::stringstream}
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*/
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std::stringstream&
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GetResult()
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{
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return this->result;
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}
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/**
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* Clear
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*
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* Clear the result to reuse the parser object.
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*
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* It is only used by one test for now.
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*
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* @method
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* @return {void}
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*/
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void
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Clear()
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{
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this->result.str("");
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}
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protected:
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std::stringstream result;
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std::shared_ptr<BlockParser> childParser;
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virtual bool isInlineBlockAllowed() const = 0;
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virtual bool isLineParserAllowed() const = 0;
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virtual void parseBlock(std::string& line) = 0;
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void
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parseLine(std::string& line)
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{
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if (parseLineCallback)
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{
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parseLineCallback(line);
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}
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}
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uint32_t
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getIndentationWidth(const std::string& line) const
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{
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bool hasMetNonSpace = false;
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uint32_t indentation = static_cast<uint32_t>(
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std::count_if(
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line.begin(),
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line.end(),
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[&hasMetNonSpace](unsigned char c)
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{
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if (hasMetNonSpace)
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{
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return false;
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}
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if (std::isspace(c))
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{
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return true;
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}
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hasMetNonSpace = true;
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return false;
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}
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)
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);
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return indentation;
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}
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std::shared_ptr<BlockParser>
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getBlockParserForLine(const std::string& line)
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{
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if (getBlockParserForLineCallback)
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{
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return getBlockParserForLineCallback(line);
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}
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return nullptr;
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}
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private:
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std::function<void(std::string&)> parseLineCallback;
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std::function<std::shared_ptr<BlockParser>(const std::string& line)> getBlockParserForLineCallback;
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}; // class BlockParser
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// -----------------------------------------------------------------------------
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} // namespace maddy
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