ferencd@0: /*
ferencd@0:  * This project is licensed under the MIT license. For more information see the
ferencd@0:  * LICENSE file.
ferencd@0:  */
ferencd@0: #pragma once
ferencd@0: 
ferencd@0: // -----------------------------------------------------------------------------
ferencd@0: 
ferencd@0: #include <functional>
ferencd@0: #include <sstream>
ferencd@0: #include <string>
ferencd@0: // windows compatibility includes
ferencd@0: #include <cctype>
ferencd@0: #include <algorithm>
ferencd@0: 
ferencd@0: // -----------------------------------------------------------------------------
ferencd@0: 
ferencd@0: namespace maddy {
ferencd@0: 
ferencd@0: // -----------------------------------------------------------------------------
ferencd@0: 
ferencd@0: /**
ferencd@0:  * BlockParser
ferencd@0:  *
ferencd@0:  * The code expects every child to have the following static function to be
ferencd@0:  * implemented:
ferencd@0:  * `static bool IsStartingLine(const std::string& line)`
ferencd@0:  *
ferencd@0:  * @class
ferencd@0:  */
ferencd@0: class BlockParser
ferencd@0: {
ferencd@0: public:
ferencd@0:   /**
ferencd@0:    * ctor
ferencd@0:    *
ferencd@0:    * @method
ferencd@0:    * @param {std::function<void(std::string&)>} parseLineCallback
ferencd@0:    * @param {std::function<std::shared_ptr<BlockParser>(const std::string& line)>} getBlockParserForLineCallback
ferencd@0:    */
ferencd@0:   BlockParser(
ferencd@0:     std::function<void(std::string&)> parseLineCallback,
ferencd@0:     std::function<std::shared_ptr<BlockParser>(const std::string& line)> getBlockParserForLineCallback
ferencd@0:   )
ferencd@0:     : result("", std::ios_base::ate | std::ios_base::in | std::ios_base::out)
ferencd@0:     , childParser(nullptr)
ferencd@0:     , parseLineCallback(parseLineCallback)
ferencd@0:     , getBlockParserForLineCallback(getBlockParserForLineCallback)
ferencd@0:   {}
ferencd@0: 
ferencd@0:   /**
ferencd@0:    * dtor
ferencd@0:    *
ferencd@0:    * @method
ferencd@0:    */
ferencd@0:   virtual ~BlockParser() {}
ferencd@0: 
ferencd@0:   /**
ferencd@0:    * AddLine
ferencd@0:    *
ferencd@0:    * Adding a line which has to be parsed.
ferencd@0:    *
ferencd@0:    * @method
ferencd@0:    * @param {std::string&} line
ferencd@0:    * @return {void}
ferencd@0:    */
ferencd@0:   virtual void
ferencd@0:   AddLine(std::string& line)
ferencd@0:   {
ferencd@0:     this->parseBlock(line);
ferencd@0: 
ferencd@0:     if (this->isInlineBlockAllowed() && !this->childParser)
ferencd@0:     {
ferencd@0:       this->childParser = this->getBlockParserForLine(line);
ferencd@0:     }
ferencd@0: 
ferencd@0:     if (this->childParser)
ferencd@0:     {
ferencd@0:       this->childParser->AddLine(line);
ferencd@0: 
ferencd@0:       if (this->childParser->IsFinished())
ferencd@0:       {
ferencd@0:         this->result << this->childParser->GetResult().str();
ferencd@0:         this->childParser = nullptr;
ferencd@0:       }
ferencd@0: 
ferencd@0:       return;
ferencd@0:     }
ferencd@0: 
ferencd@0:     if (this->isLineParserAllowed())
ferencd@0:     {
ferencd@0:       this->parseLine(line);
ferencd@0:     }
ferencd@0: 
ferencd@0:     this->result << line;
ferencd@0:   }
ferencd@0: 
ferencd@0:   /**
ferencd@0:    * IsFinished
ferencd@0:    *
ferencd@0:    * Check if the BlockParser is done
ferencd@0:    *
ferencd@0:    * @method
ferencd@0:    * @return {bool}
ferencd@0:    */
ferencd@0:   virtual bool IsFinished() const = 0;
ferencd@0: 
ferencd@0:   /**
ferencd@0:    * GetResult
ferencd@0:    *
ferencd@0:    * Get the parsed HTML output.
ferencd@0:    *
ferencd@0:    * @method
ferencd@0:    * @return {std::stringstream}
ferencd@0:    */
ferencd@0:   std::stringstream&
ferencd@0:   GetResult()
ferencd@0:   {
ferencd@0:     return this->result;
ferencd@0:   }
ferencd@0: 
ferencd@0:   /**
ferencd@0:    * Clear
ferencd@0:    *
ferencd@0:    * Clear the result to reuse the parser object.
ferencd@0:    *
ferencd@0:    * It is only used by one test for now.
ferencd@0:    *
ferencd@0:    * @method
ferencd@0:    * @return {void}
ferencd@0:    */
ferencd@0:   void
ferencd@0:   Clear()
ferencd@0:   {
ferencd@0:     this->result.str("");
ferencd@0:   }
ferencd@0: 
ferencd@0: protected:
ferencd@0:   std::stringstream result;
ferencd@0:   std::shared_ptr<BlockParser> childParser;
ferencd@0: 
ferencd@0:   virtual bool isInlineBlockAllowed() const = 0;
ferencd@0:   virtual bool isLineParserAllowed() const = 0;
ferencd@0:   virtual void parseBlock(std::string& line) = 0;
ferencd@0: 
ferencd@0:   void
ferencd@0:   parseLine(std::string& line)
ferencd@0:   {
ferencd@0:     if (parseLineCallback)
ferencd@0:     {
ferencd@0:       parseLineCallback(line);
ferencd@0:     }
ferencd@0:   }
ferencd@0: 
ferencd@0:   uint32_t
ferencd@0:   getIndentationWidth(const std::string& line) const
ferencd@0:   {
ferencd@0:     bool hasMetNonSpace = false;
ferencd@0: 
ferencd@0:     uint32_t indentation = static_cast<uint32_t>(
ferencd@0:       std::count_if(
ferencd@0:         line.begin(),
ferencd@0:         line.end(),
ferencd@0:         [&hasMetNonSpace](unsigned char c)
ferencd@0:         {
ferencd@0:           if (hasMetNonSpace)
ferencd@0:           {
ferencd@0:             return false;
ferencd@0:           }
ferencd@0: 
ferencd@0:           if (std::isspace(c))
ferencd@0:           {
ferencd@0:             return true;
ferencd@0:           }
ferencd@0: 
ferencd@0:           hasMetNonSpace = true;
ferencd@0:           return false;
ferencd@0:         }
ferencd@0:       )
ferencd@0:     );
ferencd@0: 
ferencd@0:     return indentation;
ferencd@0:   }
ferencd@0: 
ferencd@0:   std::shared_ptr<BlockParser>
ferencd@0:   getBlockParserForLine(const std::string& line)
ferencd@0:   {
ferencd@0:     if (getBlockParserForLineCallback)
ferencd@0:     {
ferencd@0:       return getBlockParserForLineCallback(line);
ferencd@0:     }
ferencd@0: 
ferencd@0:     return nullptr;
ferencd@0:   }
ferencd@0: 
ferencd@0: private:
ferencd@0:   std::function<void(std::string&)> parseLineCallback;
ferencd@0:   std::function<std::shared_ptr<BlockParser>(const std::string& line)> getBlockParserForLineCallback;
ferencd@0: }; // class BlockParser
ferencd@0: 
ferencd@0: // -----------------------------------------------------------------------------
ferencd@0: 
ferencd@0: } // namespace maddy