/// <summary>
/// Reads a token until the end of a variable segment and advances the enumerator position
/// </summary>
/// <param name="sb">The StringBuilder to write to</param>
/// <param name="markupEnumerator">The string enumerator</param>
/// <returns>True if valid variable, otherwise false</returns>
private static bool ReadToEndOfVariable(StringBuilder sb, CharEnumerator markupEnumerator)
{
while (markupEnumerator.HasNext())
{
var nextChar = markupEnumerator.Next;
if (SearchVariableEnd.Contains(nextChar))
{
return(true);
}
if (!ReadWordChar(sb, markupEnumerator))
{
return(false);
}
}
;
return(true);
}
/// <summary>
/// Enumerates over a variable sequence in dotted or bracket notation
/// </summary>
/// <param name="source">The Liquid Variable string</param>
/// <exception cref="SyntaxException"></exception>
internal static IEnumerator <string> GetVariableEnumerator(string source)
{
if (string.IsNullOrEmpty(source))
{
yield break;
}
using (var markupEnumerator = new CharEnumerator(source))
{
while (markupEnumerator.HasNext())
{
var isComplete = false;
var nextVariable = new StringBuilder();
switch (markupEnumerator.Next)
{
case '[': // Example Syntax: [var] or ["literal"]
markupEnumerator.AppendNext(nextVariable);
if (!markupEnumerator.HasNext())
{
break;
}
switch (markupEnumerator.Next)
{
case '"':
case '\'':
markupEnumerator.AppendNext(nextVariable);
isComplete = ReadToChar(nextVariable, markupEnumerator, markupEnumerator.Next) && ReadToChar(nextVariable, markupEnumerator, BracketEnd);
break;
default:
isComplete = ReadToChar(nextVariable, markupEnumerator, BracketEnd);
break;
}
break;
default:
isComplete = ReadWordChar(nextVariable, markupEnumerator) && ReadToEndOfVariable(nextVariable, markupEnumerator);
break;
}
if (!isComplete) // Somehow we reached the end without finding the end character(s)
{
throw new SyntaxException(Liquid.ResourceManager.GetString("VariableNotTerminatedException"), source, Liquid.VariableEnd);
}
if (markupEnumerator.HasNext() && markupEnumerator.Next == '.' && markupEnumerator.Remaining > 1) // Don't include dot in tokens as it is a separator
{
markupEnumerator.MoveNext();
}
if (nextVariable.Length > 0)
{
yield return(nextVariable.ToString());
}
}
;
}
}
