public IExpression ParseCondition(string expression)
{
try
{
List <Token> tokens = _tokenizer.Tokenize(expression);
IExpression expr = Parse(tokens);
IExpression optimized = ExpressionOptimizer.Run(expr);
return(optimized);
}
catch (Exception e)
{
throw new ParseException(string.Format("Unable to parse \"{0}\": {1}", expression, e.Message), e);
}
}
public IExpression ParseItemList(string expression)
{
try
{
List <Token> tokens = _tokenizer.Tokenize(expression);
var stack = new List <TokenOrExpression>();
foreach (Token token in tokens)
{
stack.Add(token);
}
bool successfullyParsed;
do
{
successfullyParsed = false;
if (TryParseItemListContent(stack))
{
successfullyParsed = true;
}
if (TryParseItemList(stack))
{
successfullyParsed = true;
}
} while (stack.Count > 1 && successfullyParsed);
if (stack.Count == 0) //< Empty input was given
{
return(new ItemListExpression());
}
if (stack.Count > 1 || stack[0].Expression == null)
{
throw new ParseException("Expected exactly one token on the stack");
}
IExpression itemList = stack[0].Expression;
IExpression optimized = ExpressionOptimizer.Run(itemList);
return(optimized);
}
catch (Exception e)
{
throw new ParseException(string.Format("Unable to parse \"{0}\": {1}", expression, e.Message), e);
}
}
public IExpression ParseConcatenation(string expression)
{
try
{
if (string.IsNullOrEmpty(expression))
{
return(StringLiteral.Empty);
}
// This is much simpler since we don't interpret general expressions
// in string concatenation: We only replace property values..
List <Token> tokens = _tokenizer.Tokenize(expression);
var stack = new List <TokenOrExpression>(tokens.Count);
foreach (Token token in tokens)
{
stack.Add(token);
}
bool successfullyParsed;
do
{
successfullyParsed = false;
if (TryParseLiteral(stack))
{
successfullyParsed = true;
}
if (TryParseSpecialCharsAsLiteral(stack, consumeItemListSeparator: true))
{
successfullyParsed = true;
}
if (TryParseItemListReference(stack))
{
successfullyParsed = true;
}
if (TryParseVariableReference(stack))
{
successfullyParsed = true;
}
if (TryParseItemListReference(stack))
{
successfullyParsed = true;
}
if (TryParseConcatenation(stack, consumeItemListSeparator: true, includeMetadataReference: true))
{
successfullyParsed = true;
}
} while (stack.Count > 1 && successfullyParsed);
if (stack.Count != 1)
{
throw new ParseException();
}
if (stack[0].Expression == null)
{
throw new ParseException();
}
IExpression expr = stack[0].Expression;
IExpression optimized = ExpressionOptimizer.Run(expr);
return(optimized);
}
catch (Exception e)
{
throw new ParseException(string.Format("Unable to parse \"{0}\": {1}", expression, e.Message), e);
}
}