/// <summary>
/// Check if text has symbol for current action.
/// </summary>
/// <param name="text">Text to check.</param>
/// <param name="index">Index in text.</param>
/// <param name="action">Action to check.</param>
/// <param name="length">Length of symbol is set here.</param>
/// <returns></returns>
internal static bool IsSymbol(string text, int index, ParserActions action, ref int length)
{
// Get symbol list for action.
SymbolList list = null;
switch (action)
{
case ParserActions.Escape: list = EscapeSymbol; break;
case ParserActions.VariableStart: list = VariableStartSymbol; break;
case ParserActions.VariableEnd: list = VariableEndSymbol; break;
case ParserActions.VariableDelimiter: list = VariableDelimiterSymbol; break;
case ParserActions.ArgumentStart: list = ArgumentStartSymbol; break;
case ParserActions.ArgumentEnd: list = ArgumentEndSymbol; break;
case ParserActions.ArgumentDelimiter: list = ArgumentDelimiterSymbol; break;
case ParserActions.LiteralStart: list = LiteralStartSymbol; break;
case ParserActions.LiteralEnd: list = LiteralEndSymbol; break;
case ParserActions.BlockIgnore: list = IgnoreBlockSymbol; break;
case ParserActions.AlwaysIgnore: list = IgnoreAlwaysSymbol; break;
default:
throw new InvalidOperationException();
}
return(list.Test(text, index, ref length));
}
/// <summary>
/// Perform static initialization.
/// </summary>
static Parser()
{
EscapeSymbol = new SymbolList("\\");
VariableStartSymbol = new SymbolList("<");
VariableEndSymbol = new SymbolList(">");
VariableDelimiterSymbol = new SymbolList(".");
ArgumentStartSymbol = new SymbolList("(");
ArgumentEndSymbol = new SymbolList(")");
ArgumentDelimiterSymbol = new SymbolList(",");
LiteralStartSymbol = new SymbolList("\"");
LiteralEndSymbol = new SymbolList("\"");
IgnoreBlockSymbol = new SymbolList(" ", "\t");
IgnoreAlwaysSymbol = new SymbolList();
// Register if function.
Functions["if"] = q =>
{
if (q.Length <= 1)
{
return(null);
}
if (q.Length == 2)
{
Value v = new Value(q[0]);
bool qr = false;
if (v.TryToBoolean(out qr))
{
return(qr ? q[1] : "");
}
return(null);
}
if (q.Length == 3)
{
Value v = new Value(q[0]);
bool qr = false;
if (v.TryToBoolean(out qr))
{
return(qr ? q[1] : q[2]);
}
return(null);
}
return(null);
};
// Register randomizer function.
Functions["rand"] = q =>
{
if (q.Length == 0)
{
return(new Value(Randomizer.NextDouble()).ToString());
}
if (q.Length == 1)
{
Value v = new Value(q[0]);
double qv;
if (v.TryToDouble(out qv))
{
return(Randomizer.Roll(qv) ? "1" : "0");
}
return(null);
}
else if (q.Length == 2)
{
Value v1 = new Value(q[0]);
Value v2 = new Value(q[1]);
double qv1, qv2;
if (!v1.TryToDouble(out qv1) || !v2.TryToDouble(out qv2))
{
return(null);
}
if (qv2 < qv1)
{
return(v1.ToString());
}
return(new Value(Randomizer.NextDouble() * (qv2 - qv1) + qv1).ToString());
}
return(null);
};
Functions["rnd"] = Functions["rand"];
Functions["random"] = Functions["rand"];
}