/// <summary>
/// Registers lambda expression under the specified <paramref name="functionName" />.
/// </summary>
/// <param name="functionName">Function name to register expression as.</param>
/// <param name="lambdaExpression">Lambda expression to register.</param>
/// <param name="variables">Variables dictionary that the function will be registered in.</param>
public static void RegisterFunction(string functionName, string lambdaExpression, IDictionary variables)
{
AssertUtils.ArgumentHasText(functionName, "functionName");
AssertUtils.ArgumentHasText(lambdaExpression, "lambdaExpression");
var lexer = new ExpressionLexer(new StringReader(lambdaExpression));
ExpressionParser parser = new SolenoidExpressionParser(lexer);
try
{
parser.lambda();
}
catch (TokenStreamRecognitionException ex)
{
throw new SyntaxErrorException(ex.recog.Message, ex.recog.Line, ex.recog.Column, lambdaExpression);
}
variables[functionName] = parser.getAST();
}
/// <summary>
/// Initializes a new instance of the <see cref="Expression" /> class
/// by parsing specified property expression string.
/// </summary>
/// <param name="expression">Property expression to parse.</param>
internal static IExpression ParseProperty(string expression)
{
if (StringUtils.HasText(expression))
{
var lexer = new ExpressionLexer(new StringReader(expression));
ExpressionParser parser = new SolenoidExpressionParser(lexer);
try
{
parser.property();
}
catch (TokenStreamRecognitionException ex)
{
throw new SyntaxErrorException(ex.recog.Message, ex.recog.Line, ex.recog.Column, expression);
}
return((IExpression)parser.getAST());
}
return(new Expression());
}
