public static string NormalizePathPrefix()

in SharpGenTools.Sdk/Internal/Roslyn/PathUtilities.cs [660:694]
24 lines of code
9 McCabe index (conditional complexity)

        public static string NormalizePathPrefix(string filePath, ImmutableArray<KeyValuePair<string, string>> pathMap)
        {
            if (pathMap.IsDefaultOrEmpty)
            {
                return filePath;
            }

            // find the first key in the path map that matches a prefix of the normalized path.
            // Note that we expect the client to use consistent capitalization; we use ordinal (case-sensitive) comparisons.
            foreach (var kv in pathMap)
            {
                var oldPrefix = kv.Key;
                if (!(oldPrefix?.Length > 0)) continue;

                // oldPrefix always ends with a path separator, so there's no need to check if it was a partial match
                // e.g. for the map /goo=/bar and filename /goooo
                if (filePath.StartsWith(oldPrefix, StringComparison.Ordinal))
                {
                    var replacementPrefix = kv.Value;

                    // Replace that prefix.
                    var replacement = replacementPrefix + filePath.Substring(oldPrefix.Length);

                    // Normalize the path separators if used uniformly in the replacement
                    bool hasSlash = replacementPrefix.IndexOf('/') >= 0;
                    bool hasBackslash = replacementPrefix.IndexOf('\\') >= 0;
                    return
                        (hasSlash && !hasBackslash) ? replacement.Replace('\\', '/') :
                        (hasBackslash && !hasSlash) ? replacement.Replace('/', '\\') :
                        replacement;
                }
            }

            return filePath;
        }