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