private void _GetNext()
{
Lexeme buffer = null;
while (_input.Peek() != -1)
{
_readFlag = true;
switch (_input.Peek())
{
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
buffer = new NumberLexeme(GetDecimal());
_readFlag = false;
break;
case '+':
buffer = new Lexeme(LexemeType.add);
break;
case '-':
buffer = new Lexeme(LexemeType.sub);
break;
case '*':
buffer = new Lexeme(LexemeType.mul);
break;
case '/':
buffer = new Lexeme(LexemeType.div);
break;
case ' ':
break;
case '(':
buffer = new Lexeme(LexemeType.bracketOpen);
break;
case ')':
buffer = new Lexeme(LexemeType.bracketClose);
break;
default:
throw new Exception("Недопустимый символ!!!");
}
if (_readFlag == true)
{
_input.Read();
}
if (buffer == null)
{
continue;
}
_buffer = buffer;
return;
}
_buffer = null;
return;
}
private void _GetNext()
{
Lexeme buffer = null;
while (_input.Peek() != -1)
{
_readFlag = true;
switch(_input.Peek())
{
case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9':
buffer = new NumberLexeme(GetDecimal());
_readFlag = false;
break;
case '+':
buffer = new Lexeme(LexemeType.add);
break;
case '-':
buffer = new Lexeme(LexemeType.sub);
break;
case '*':
buffer = new Lexeme(LexemeType.mul);
break;
case '/':
buffer = new Lexeme(LexemeType.div);
break;
case ' ':
break;
case '(':
buffer = new Lexeme(LexemeType.bracketOpen);
break;
case ')':
buffer = new Lexeme(LexemeType.bracketClose);
break;
default:
throw new Exception("Недопустимый символ!!!");
}
if ( _readFlag == true )
_input.Read();
if ( buffer == null )
continue;
_buffer = buffer;
return;
}
_buffer = null;
return;
}