public Func <double, double> ParseFunction(string functions)
{
if (functions.Contains("sin"))
{
return(SinFunc(functions));
}
if (functions.Contains("cos"))
{
return(CosFunc(functions));
}
if (functions.Contains("+"))
{
var index = functions.IndexOf("+");
return(PlusFunc(index, functions));
}
if (functions.Contains("-"))
{
var index = functions.IndexOf("-");
return(MinusFunc(index, functions));
}
for (var i = 0; i < functions.Length; i++)
{
if (functions[i] == '*')
{
return(d => ParseFunction(functions.Substring(0, i))(d) *
ParseFunction(functions.Substring(i + 1))(d));
}
if (char.IsDigit(functions[i]) && i != functions.Length - 1 && char.IsLetter(functions[i + 1]))
{
return(d => double.Parse(functions.Substring(0, i + 1)) *
ParseFunction(functions.Substring(i + 1))(d));
}
}
for (var i = 0; i < functions.Length; i++)
{
if (functions[i] == '^')
{
return(d => Math.Pow(d, double.Parse(functions[i + 1].ToString())));
}
}
for (var i = 0; i < functions.Length; i++)
{
if (char.IsDigit(functions[i]))
{
return(d => double.Parse(functions));
}
else if (char.IsLetter(functions[i]))
{
return(d => d);
}
}
return(d => 0);
}
public Command(string name, string description, IReadOnlyList <Arg> arguments, ParseFunction parse)
{
Name = name;
Description = description;
Arguments = arguments;
Parse = parse;
}
/// <summary>
/// Constructor.
/// </summary>
public FrontEndParseInput(AbsolutePath path, ParseFunction parse)
{
Contract.Requires(path.IsValid);
Contract.Requires(parse != null);
Path = path;
Parse = parse;
}
private static AstNode LeftAssocCombiner(
string[] operators,
ParseFunction termParser,
TokenStream tokenStream)
{
AstNode leftTerm = termParser(tokenStream);
while (tokenStream.HasMoreTokens && OneOf(tokenStream.Current.Content, operators))
{
AstNode tokenNode = new AstNode(AstNodeType.Identifier, tokenStream.Current);
tokenStream.Next();
AstNode rightTerm = termParser(tokenStream);
leftTerm = new AstNode(
AstNodeType.BinaryExpression,
new AstNode[] { tokenNode, leftTerm, rightTerm });
}
return leftTerm;
}
public Func <double, double> MinusFunc(int index, string functions)
{
return(d => ParseFunction(functions.Substring(0, index))(d) -
ParseFunction(functions.Substring(index + 1))(d));
}
//bool reset = false;
/// <summary>
/// Constructs an empty parse state.
/// </summary>
public ParseState()
{
Execute = InitialState;
}
protected ParseState Next(ParseFunction next)
{
Execute = next;
return(this);
}
public static Func <InputField, OneOf <Success, Error <string> > > CreateInputFieldValidator <T>(ParseFunction <T> parse, Func <string> errorMessage)
{
return(field =>
{
if (parse(field.text, out var _))
{
return new Success();
}
return new Error <string>(errorMessage());
});
}
public Parser(string name, ParseFunction <TSource, TResult> parse)
{
Name = name;
_parse = parse;
}
public Parser(ParseFunction <TSource, TResult> parse)
: this(null, parse)
{
}