/// <summary>
/// Will find all the (outer most ${} expressions in the code, and return their positions).
/// Smart enough to figure out $${} escaping, but not much more
/// </summary>
private static IList <ExpressionPosition> GetExpressionsPositions(string code)
{
var bracesPositions = new List <ExpressionPosition>();
bool prevCharWasDollar = false;
bool prevCharWasBang = false;
for (int index = 0; index < code.Length; index++)
{
if (code[index] == '{')
{
bracesPositions.Add(new ExpressionPosition(index - 1, -1, prevCharWasDollar || prevCharWasBang, prevCharWasBang));
}
if (code[index] == '}' && bracesPositions.Count > 0)
{
ExpressionPosition position = bracesPositions[bracesPositions.Count - 1];
if (ParentExpressionIsNotValid(bracesPositions, bracesPositions.Count))
{
bracesPositions.RemoveAt(bracesPositions.Count - 1);
}
else if (position.End == -1)
{
position.End = index;
}
}
//handles escaping expressions with $$ as well
prevCharWasDollar = code[index] == '$' && !prevCharWasDollar;
prevCharWasBang = code[index] == '!' && !prevCharWasBang;
}
bracesPositions.RemoveAll(obj => !obj.PrevCharWasDollarOrBang);
return(bracesPositions);
}
private static bool ParentExpressionIsNotValid(List <ExpressionPosition> bracesPositions,
int index)
{
if (index - 2 < 0)
{
return(false);
}
ExpressionPosition parentExpression = bracesPositions[index - 2];
if (parentExpression.PrevCharWasDollarOrBang == false)
{
return(ParentExpressionIsNotValid(bracesPositions, index - 1));
}
return(parentExpression.End == -1);
}
public TextExpression(string text, ExpressionPosition position = ExpressionPosition.Above)
{
Text = text;
Position = position;
}
internal DynamicLevelExpression(string symbol, string name, ExpressionPosition position = ExpressionPosition.Below)
{
Symbol = symbol;
Name = name;
Position = position;
}
internal ArticulationExpression(string name, ExpressionPosition position = ExpressionPosition.Below)
{
Name = name;
Position = position;
}