Work/music/scanner.cpp

#include <music/scanner.hpp>
#include <music/scansymbols.hpp>

namespace Music
{

void Scanner::init(const String &chordSymbol)
{
  remove();
  mIndex=0;
	mLength=chordSymbol.length();
	if(!mLength)return;
  mSymbol=chordSymbol;
}

char Scanner::peekChar(void)
{
  if(mIndex>=mLength)return -1;
	return mSymbol.charAt(mIndex);  
}

char Scanner::nextChar()
{
  if(mIndex+1>mLength)return -1;
	return mSymbol.charAt(mIndex++);
}

void Scanner::pushBack(void)
{
  if(!mIndex)return;
	mIndex--;
}

bool Scanner::scan(const String &chordSymbol)
{
  char symbol;
  init(chordSymbol);
	while(-1!=(symbol=nextChar()))
	{
    if(isInflection(symbol))
		  scanInflection(symbol);
    else if('/'==symbol)
		  scanSlash();
	  else if(isdigit(symbol))
		  scanDegree(symbol);
    else if('^'==symbol||'-'==symbol)
		  scanMnemonic(symbol);
		else if(isalpha(symbol))
		  scanAlpha(symbol);
		else 
		  return false;
	}
	emit(ScanSymbols::Stop1);
	if(size()<=1)return false;
	return true;
}

void Scanner::scanAlpha(char symbol)
{
	char nextChar;

  if(isNote(symbol))
	{
	  emit(ScanSymbols::Note1,Byte(symbol));
	}
	else if(isalpha(symbol)&&!isInflection(symbol)&&!isHalfDiminished(symbol)&&!isDiminished(symbol))
	{
	  string verb;
    verb+=tolower(symbol);
	  while(-1!=(nextChar=this->nextChar()))
		{
		  if(!isalpha(nextChar)||isInflection(nextChar))
			{
			  pushBack();
				break;
			}
		  verb+=tolower(nextChar);
		}
		emit(ScanSymbols::Verb1,verb);
	}
	else if(isalpha(symbol)&&isInflection(symbol))
	{
	  string verb;
    emit(ScanSymbols::Note1,Byte(symbol));
		symbol=this->nextChar();
		scanInflection(symbol);
	  while(-1!=(nextChar=this->nextChar()))
		{
		  if(!isalpha(nextChar)||isInflection(nextChar))
			{
			  pushBack();
				break;
			}
		  verb+=tolower(nextChar);
		}
		emit(ScanSymbols::Verb1,verb);
	}
	else if(isalpha(symbol)&&isHalfDiminished(symbol))
	{
    emit(ScanSymbols::HalfDiminished1);
	}
	else if(isalpha(symbol)&&isDiminished(symbol))
	{
	  emit(ScanSymbols::Diminished1);
	}
	else emit(ScanSymbols::Note1,Byte(symbol));
}

bool Scanner::isNote(char symbol)
{
  if('A'==symbol||'B'==symbol||'C'==symbol||'D'==symbol||'E'==symbol||'F'==symbol||'G'==symbol)return true;
	return false;
}

bool Scanner::isInflection(char symbol)
{
  if('b'==symbol||'#'==symbol)return true;
	return false;
}

bool Scanner::isHalfDiminished(char symbol)
{
  if('h'==symbol)return true;
	return false;
}

bool Scanner::isDiminished(char symbol)
{
  if('o'==symbol)return true;
	return false;
}

void Scanner::scanDegree(char symbol) 
{
  String str;

	str+=symbol;
	while(-1!=(symbol=peekChar())&&isdigit(symbol))
	{
	  symbol=nextChar();
	  str+=symbol;
	}
  emit(ScanSymbols::Degree1,Byte(str.toInt()));
}

void Scanner::scanMnemonic(char symbol)
{
  char nextSymbol;

  nextSymbol=peekChar();
	if(symbol=='-' && nextSymbol=='^')
	{
	  emit(ScanSymbols::MinorMajor71);
		nextChar();
	}
  else if(symbol=='^')emit(ScanSymbols::Major71);
	else if(symbol=='-')emit(ScanSymbols::Minor1);
}

void Scanner::scanInflection(char symbol)
{
  if('b'==symbol)emit(ScanSymbols::Alter1,Byte(ScanSymbols::Flat1));
	else if('#'==symbol)emit(ScanSymbols::Alter1,Byte(ScanSymbols::Sharp1));
}

void Scanner::scanSlash()
{
  emit(ScanSymbols::Slash1);
}

String Scanner::toString(void)const
{
  return Emitter::toString();
}
};