private static GlobToken ReadScope(StringReader reader, GlobTokenKind kind, char first, char last)
{
char current = (char)reader.Read();
Debug.Assert(current == first, "Unexpected token.");
var accumulator = new StringBuilder();
while (reader.Peek() != -1)
{
current = (char)reader.Peek();
if (current == last)
{
break;
}
accumulator.Append((char)reader.Read());
}
if (reader.Peek() == -1)
{
throw new InvalidOperationException($"Expected '{last}' but reached end of pattern.");
}
// Consume the last character.
current = (char)reader.Read();
Debug.Assert(current == last, "Unexpected token.");
return(new GlobToken(kind, accumulator.ToString()));
}
public GlobToken Scan()
{
_currentContent = string.Empty;
_currentKind = ScanToken();
return(new GlobToken(_currentKind, _currentContent));
}
/// <summary>
/// Loads the tokens into the token queue.
/// </summary>
/// <returns>A queue of tokens representing the pattern.</returns>
private Queue <GlobToken> QueueTokens()
{
var tokenQueue = new Queue <GlobToken>();
while (_remainingPattern.Length > 0)
{
GlobTokenKind tokenKind = GetGlobTokenKindAndTrimRemainingPattern();
if (tokenKind != GlobTokenKind.Identifier)
{
tokenQueue.Enqueue(new GlobToken(tokenKind, string.Empty));
continue;
}
while (tokenKind == GlobTokenKind.Identifier)
{
if (!string.IsNullOrEmpty(_remainingPattern))
{
tokenKind = GetGlobTokenKindAndTrimRemainingPattern();
}
else
{
break;
}
}
// We know we've got at least one Identifer, so queue it with the contents read
tokenQueue.Enqueue(new GlobToken(GlobTokenKind.Identifier, _currentContent));
_currentContent = string.Empty;
// If we quit the while loop due to hitting a new token (rather than end of string), queue it.
if (tokenKind != GlobTokenKind.Identifier)
{
tokenQueue.Enqueue(new GlobToken(tokenKind, string.Empty));
}
}
return(tokenQueue);
}
public void Accept(GlobTokenKind kind)
{
Accept(new[] { kind });
}
public GlobToken(GlobTokenKind kind, string value)
{
Kind = kind;
Value = value;
}
