private GlobNode Parse(GlobParserContext context)
{
context.Accept();
// Parse the root.
var items = new List <GlobNode> {
ParseRoot(context)
};
if (items.Count == 1 && items[0] is RelativeRootNode)
{
items.Add(ParseNode(context));
}
// Parse all path segments.
while (context.TokenCount > 0 && context.CurrentToken?.Kind == GlobTokenKind.PathSeparator)
{
context.Accept();
items.Add(ParseNode(context));
}
// Rewrite the items into a linked list.
var result = GlobNodeRewriter.Rewrite(context.Pattern, items);
GlobNodeValidator.Validate(context.Pattern, result);
return(result);
}
private static PathSegment ParseWildcard(GlobParserContext context)
{
var token = context.Accept(GlobTokenKind.Wildcard, GlobTokenKind.CharacterWildcard);
return(token.Kind == GlobTokenKind.Wildcard
? (PathSegment) new WildcardSegment()
: new CharacterWildcardSegment());
}
private static GlobNode ParseNode(GlobParserContext context)
{
if (context.CurrentToken?.Kind == GlobTokenKind.Wildcard)
{
var next = context.Peek();
if (next != null && next.Kind == GlobTokenKind.Wildcard)
{
context.Accept(GlobTokenKind.Wildcard);
context.Accept(GlobTokenKind.Wildcard);
return(new RecursiveWildcardNode());
}
}
else if (context.CurrentToken?.Kind == GlobTokenKind.Parent)
{
context.Accept(GlobTokenKind.Parent);
return(new ParentDirectoryNode());
}
else if (context.CurrentToken?.Kind == GlobTokenKind.Current)
{
context.Accept(GlobTokenKind.Current);
return(new CurrentDirectoryNode());
}
var items = new List <PathSegment>();
while (true)
{
switch (context.CurrentToken?.Kind)
{
case GlobTokenKind.Text:
case GlobTokenKind.CharacterWildcard:
case GlobTokenKind.Wildcard:
case GlobTokenKind.BracketWildcard:
case GlobTokenKind.BraceExpansion:
items.Add(ParsePathSegment(context));
continue;
}
break;
}
return(new PathNode(items, context.Options));
}
private static PathSegment ParsePathSegment(GlobParserContext context)
{
if (context.CurrentToken != null)
{
switch (context.CurrentToken.Kind)
{
case GlobTokenKind.Text:
return(ParseText(context));
case GlobTokenKind.CharacterWildcard:
case GlobTokenKind.Wildcard:
return(ParseWildcard(context));
case GlobTokenKind.BracketWildcard:
return(ParseBracketWildcard(context));
case GlobTokenKind.BraceExpansion:
return(ParseBraceExpansion(context));
}
}
throw new NotSupportedException("Unable to parse sub segment.");
}
private GlobNode ParseRoot(GlobParserContext context)
{
if (context.CurrentToken == null)
{
return(new RelativeRootNode());
}
if (_environment.Platform.IsUnix())
{
// Starts with a separator?
if (context.CurrentToken.Kind == GlobTokenKind.PathSeparator)
{
return(new UnixRootNode());
}
}
else
{
// Starts with a separator?
if (context.CurrentToken.Kind == GlobTokenKind.PathSeparator)
{
if (context.Peek()?.Kind == GlobTokenKind.PathSeparator)
{
context.Accept();
return(new UncRootNode(string.Empty));
}
// Get the drive from the working directory.
var workingDirectory = _environment.WorkingDirectory;
var root = workingDirectory.FullPath.Split(':').First();
return(new WindowsRootNode(root));
}
// Is this a drive?
if (context.CurrentToken.Kind == GlobTokenKind.Text &&
context.CurrentToken.Value.Length == 1 &&
context.Peek()?.Kind == GlobTokenKind.WindowsRoot)
{
var identifier = ParseText(context);
context.Accept(GlobTokenKind.WindowsRoot);
return(new WindowsRootNode(identifier.Value));
}
}
// Starts with an identifier?
if (context.CurrentToken.Kind == GlobTokenKind.Text)
{
// Is the identifier indicating a current directory?
if (context.CurrentToken.Value == ".")
{
context.Accept(GlobTokenKind.Text);
if (context.CurrentToken.Kind != GlobTokenKind.PathSeparator)
{
throw new InvalidOperationException();
}
context.Accept(GlobTokenKind.PathSeparator);
}
}
return(new RelativeRootNode());
}
private static BraceExpansionSegment ParseBraceExpansion(GlobParserContext context)
{
var token = context.Accept(GlobTokenKind.BraceExpansion);
return(new BraceExpansionSegment(token.Value));
}
private static PathSegment ParseBracketWildcard(GlobParserContext context)
{
var token = context.Accept(GlobTokenKind.BracketWildcard);
return(new BracketWildcardSegment(token.Value));
}
private static PathSegment ParseText(GlobParserContext context)
{
var token = context.Accept(GlobTokenKind.Text);
return(new TextSegment(token.Value));
}