AGS.CScript.Compiler.Preprocessor.ProcessConditionalDirective C# (CSharp) Method

        private void ProcessConditionalDirective(string directive, string line, CompileResults results)
        {
            string macroName = GetNextWord(ref line, true, true);
            if (macroName.Length == 0)
            {
                RecordError(ErrorCode.MacroNameMissing, "Expected something after '" + directive + "'");
                return;
            }

            bool includeCodeBlock = true;

            if ((_conditionalStatements.Count > 0) &&
                (_conditionalStatements.Peek() == false))
            {
                includeCodeBlock = false;
            }
            else if (directive.EndsWith("def"))
            {
                includeCodeBlock = _state.Macros.Contains(macroName);
                if (directive == "ifndef")
                {
                    includeCodeBlock = !includeCodeBlock;
                }
            }
            else if (directive == "ifver" || directive == "ifnver")
            {
                // Compare provided version number with the current application version
                try
                {
                    Version appVersion = new Version(_applicationVersion);
                    Version macroVersion = new Version(macroName);
                    includeCodeBlock = appVersion.CompareTo(macroVersion) >= 0;
                    if (directive == "ifnver")
                    {
                        includeCodeBlock = !includeCodeBlock;
                    }
                }
                catch (Exception e)
                {
                    RecordError(ErrorCode.InvalidVersionNumber, String.Format("Cannot parse version number: {0}", e.Message));
                }
            }

            _conditionalStatements.Push(includeCodeBlock);
        }