/// <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 ))
{
ExpressionLexer lexer = new ExpressionLexer( new StringReader( expression ) );
ExpressionParser parser = new SpringExpressionParser( lexer );
try
{
parser.property();
}
catch (TokenStreamRecognitionException ex)
{
throw new SyntaxErrorException( ex.recog.Message, ex.recog.getLine(), ex.recog.getColumn(), expression );
}
return (IExpression)parser.getAST();
}
else
{
return new Expression();
}
}
/// <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" );
ExpressionLexer lexer = new ExpressionLexer( new StringReader( lambdaExpression ) );
ExpressionParser parser = new SpringExpressionParser( lexer );
try
{
parser.lambda();
}
catch (TokenStreamRecognitionException ex)
{
throw new SyntaxErrorException( ex.recog.Message, ex.recog.getLine(), ex.recog.getColumn(), lambdaExpression );
}
variables[functionName] = parser.getAST();
}