/**
* Visible for Testing.
*
* Inspects the key in a particular order to determine the correct sublass of
* PathElement to create.
*
* @param origKey string that should represent a single PathElement
* @return a concrete implementation of PathElement
*/
public static IPathElement ParseSingleKeyLHS(string origKey)
{
string elementKey; // the string to use to actually make Elements
string keyToInspect; // the string to use to determine which kind of Element to create
if (origKey.Contains("\\"))
{
// only do the extra work of processing for escaped chars, if there is one.
keyToInspect = SpecStringParser.RemoveEscapedValues(origKey);
elementKey = SpecStringParser.RemoveEscapeChars(origKey);
}
else
{
keyToInspect = origKey;
elementKey = origKey;
}
//// LHS single values
if ("@" == keyToInspect)
{
return(new AtPathElement(elementKey));
}
else if ("*" == keyToInspect)
{
return(new StarAllPathElement(elementKey));
}
else if (keyToInspect.StartsWith("["))
{
if (StringTools.CountMatches(keyToInspect, "[") != 1 || StringTools.CountMatches(keyToInspect, "]") != 1)
{
throw new SpecException("Invalid key:" + origKey + " has too many [] references.");
}
return(new ArrayPathElement(elementKey));
}
//// LHS multiple values
else if (keyToInspect.StartsWith("@") || keyToInspect.Contains("@("))
{
// The traspose path element gets the origKey so that it has it's escapes.
return(TransposePathElement.Parse(origKey));
}
else if (keyToInspect.Contains("@"))
{
throw new SpecException("Invalid key:" + origKey + " can not have an @ other than at the front.");
}
else if (keyToInspect.Contains("$"))
{
return(new DollarPathElement(elementKey));
}
else if (keyToInspect.Contains("["))
{
if (StringTools.CountMatches(keyToInspect, "[") != 1 || StringTools.CountMatches(keyToInspect, "]") != 1)
{
throw new SpecException("Invalid key:" + origKey + " has too many [] references.");
}
return(new ArrayPathElement(elementKey));
}
else if (keyToInspect.Contains("&"))
{
if (keyToInspect.Contains("*"))
{
throw new SpecException("Invalid key:" + origKey + ", Can't mix * with & ) ");
}
return(new AmpPathElement(elementKey));
}
else if (keyToInspect.Contains("*"))
{
int numOfStars = StringTools.CountMatches(keyToInspect, "*");
if (numOfStars == 1)
{
return(new StarSinglePathElement(elementKey));
}
else if (numOfStars == 2)
{
return(new StarDoublePathElement(elementKey));
}
else
{
return(new StarRegexPathElement(elementKey));
}
}
else if (keyToInspect.Contains("#"))
{
return(new HashPathElement(elementKey));
}
else
{
return(new LiteralPathElement(elementKey));
}
}
