/* Function: GetParametersIndex
* If a plain text string ends in parameters, returns the index of the opening brace character. Returns -1 otherwise.
*/
public static int GetParametersIndex(string input)
{
if (input == null)
{
return(-1);
}
input = input.TrimEnd();
int index = input.Length - 1;
if (input.Length >= 2 && IsClosingBrace(input[index]))
{
// We have to count the braces so it correctly returns "(paren2)" from "text (paren) text2 (paren2)" and not
// "(paren) text2 (paren2)". We also want to handle nested braces.
Collections.SafeStack <char> braces = new Collections.SafeStack <char>();
braces.Push(input[index]);
while (index > 0)
{
// The start position LastIndexOfAny() takes is the character at the end of the string to be examined first.
// The count is the number of characters to examine, so it's one higher as index 4 goes for 5 characters: indexes 0, 1, 2,
// 3, and 4. The character at the start position is examined, it's not a limit.
index = input.LastIndexOfAny(AllBraces, index - 1, index);
if (index == -1)
{
break;
}
if (IsClosingBrace(input[index]))
{
braces.Push(input[index]);
}
else // IsOpeningBrace(input[index])
{
if (BracesMatch(input[index], braces.Peek()))
{
braces.Pop();
if (braces.Count == 0)
{
break;
}
}
else
{
break;
}
}
}
// We don't want to count the angle brackets in "operator<string>" as parameters since this is the distinguishing part of
// the name.
if (index >= 0 && input[index] == '<')
{
int lookbehind = index - 1;
while (lookbehind > 0 && input[lookbehind] == ' ')
{
lookbehind--;
}
if (lookbehind >= 7 && string.Compare(input, lookbehind - 7, "operator", 0, 8, true) == 0)
{
return(-1);
}
}
// We want index to be greater than zero so we don't include cases where the entire title is surrounded
// by braces.
if (braces.Count == 0 && index > 0)
{
return(index);
}
}
return(-1);
}
/* Function: FromPlainText
* Creates a ParameterString from plain text such as "(int, int)". You can extract them from a plain text identifier with
* <GetParametersIndex()>.
*/
public static ParameterString FromPlainText(string input)
{
if (input == null)
{
throw new NullReferenceException();
}
input = input.Trim();
#if DEBUG
if ((input.Length < 2 || IsOpeningBrace(input[0]) == false || IsClosingBrace(input[input.Length - 1]) == false) &&
GetParametersIndex(input) != -1)
{
throw new Exception("Passed a full identifier to ParameterString.FromPlainText(). Separate the parameters from the identifier first.");
}
#endif
if (input.Length < 2 || IsOpeningBrace(input[0]) == false || IsClosingBrace(input[input.Length - 1]) == false)
{
throw new FormatException();
}
input = input.Substring(1, input.Length - 2); // Strip surrounding braces.
input = input.Trim();
if (input == "")
{
return(new ParameterString());
}
System.Text.StringBuilder output = new System.Text.StringBuilder(input.Length);
// Ignore separators appearing within braces. We've already filtered out the surrounding braces and we shouldn't have to
// worry about quotes because we should only have types, not default values.
Collections.SafeStack <char> braces = new Collections.SafeStack <char>();
int startParam = 0;
int index = input.IndexOfAny(AllBracesAndParamSeparators);
while (index != -1)
{
char character = input[index];
if (IsOpeningBrace(character))
{
braces.Push(character);
}
else if (BracesMatch(braces.Peek(), character))
{
braces.Pop();
}
else if ((character == ',' || character == ';') && braces.Count == 0)
{
NormalizeAndAppend(input.Substring(startParam, index - startParam), output);
output.Append(SeparatorChar);
startParam = index + 1;
}
index = input.IndexOfAny(AllBracesAndParamSeparators, index + 1);
}
NormalizeAndAppend(input.Substring(startParam), output);
return(new ParameterString(output.ToString()));
}
