internal IMathMeta GET_INSTANCE_FOR(string keyword)
{
var hasOperatorforKeyword = SupportedOperators?.FirstOrDefault(c => c.ToString() == keyword);
if (hasOperatorforKeyword != null)
{
return(hasOperatorforKeyword);
}
var hasFunction = SupportedFunctions?.FirstOrDefault(c => c.ToString() == keyword);
if (hasFunction != null)
{
return(hasFunction);
}
var hasConstant = SupportedConstants?.FirstOrDefault(c => c.ToString() == keyword);
if (hasConstant != null)
{
return(hasConstant);
}
if (keyword[0] != BaseInterpreter.NumberMarker ||
(
!char.IsDigit(keyword[0]) &&
keyword[0] != BaseInterpreter.NumberMarker))
{
throw new Exception("Argument is not understood! Define " + keyword + "!");
}
return(NumberResult.Create(keyword));
}
public IMathMeta LexicalAnalysisInFixNotation(string expression, ref int position)
{
// Receive first char
StringBuilder token = new StringBuilder();
token.Append(expression[position]);
IMathOperator @operator;
if (CHECK_IF_OPERATOR(expression, ref position, out @operator))
{
return(@operator);
}
if (Char.IsLetter(expression[position]))
{
while (++position < expression.Length && Char.IsLetter(expression[position]))
{
token.Append(expression[position]);
}
}
if (char.IsLetter(token[0]) &&// if it is a function
SupportedFunctions.Any(c => c.Keyword.StartsWith(token.ToString()))
)
{
if (SupportedFunctions.Any(c => c.Keyword == token.ToString()))
{
return(SupportedFunctions.FirstOrDefault(c => c.Keyword == token.ToString()));
}
}
if (char.IsLetter(token[0]) &&
SupportedConstants.Any(c => c.Keyword.StartsWith(token.ToString())))
// if it is a constant
{
return(SupportedConstants.FirstOrDefault(c => c.Keyword == token.ToString()));
}
if (Char.IsDigit(token[0]) || token[0].ToString() == DecimalSeperatorAccordingToCurrentCulture)
{
// Read number
// Read the whole part of number
if (Char.IsDigit(token[0]))
{
while (++position < expression.Length &&
Char.IsDigit(expression[position]))
{
token.Append(expression[position]);
}
}
else
{
// Because system decimal separator
// will be added below
token.Clear();
}
// Read the fractional part of number
if (position < expression.Length &&
expression[position].ToString() == DecimalSeperatorAccordingToCurrentCulture)
{
// Add current system specific decimal separator
token.Append(DecimalSeperatorAccordingToCurrentCulture);
while (++position < expression.Length &&
Char.IsDigit(expression[position]))
{
token.Append(expression[position]);
}
}
// Read scientific notation (suffix)
if (position + 1 < expression.Length && expression[position] == 'e' &&
(Char.IsDigit(expression[position + 1]) ||
(position + 2 < expression.Length &&
(expression[position + 1] == '+' ||
expression[position + 1] == '-') &&
Char.IsDigit(expression[position + 2]))))
{
token.Append(expression[position++]); // e
if (expression[position] == '+' || expression[position] == '-')
{
token.Append(expression[position++]); // sign
}
while (position < expression.Length &&
Char.IsDigit(expression[position]))
{
token.Append(expression[position++]); // power
}
// Convert number from scientific notation to decimal notation
}
return(NumberResult.Create(token.ToString()));
}
else
{
throw new ArgumentException("Unknown token in expression");
}
}
