private Dictionary GetParameters()

in src/FunctionInfo.cs [161:212]
47 lines of code
10 McCabe index (conditional complexity)

        private Dictionary<string, PSScriptParamInfo> GetParameters(string scriptFile, string entryPoint, out ScriptBlockAst scriptAst)
        {
            scriptAst = Parser.ParseFile(scriptFile, out _, out ParseError[] errors);
            if (errors != null && errors.Length > 0)
            {
                var stringBuilder = new StringBuilder(15);
                foreach (var error in errors)
                {
                    stringBuilder.AppendLine(error.Message);
                }

                string errorMsg = stringBuilder.ToString();
                throw new ArgumentException(string.Format(PowerShellWorkerStrings.FailToParseScript, scriptFile, errorMsg));
            }

            ReadOnlyCollection<ParameterAst> paramAsts = null;
            if (string.IsNullOrEmpty(entryPoint))
            {
                paramAsts = scriptAst.ParamBlock?.Parameters;
            }
            else
            {
                var asts = scriptAst.FindAll(
                    ast => ast is FunctionDefinitionAst func && entryPoint.Equals(func.Name, StringComparison.OrdinalIgnoreCase),
                    searchNestedScriptBlocks: false).ToList();

                if (asts.Count == 1)
                {
                    var funcAst = (FunctionDefinitionAst) asts[0];
                    paramAsts = funcAst.Parameters ?? funcAst.Body.ParamBlock?.Parameters;
                }
                else
                {
                    string errorMsg = asts.Count == 0
                        ? string.Format(PowerShellWorkerStrings.CannotFindEntryPoint, entryPoint, scriptFile)
                        : string.Format(PowerShellWorkerStrings.MultipleEntryPointFound, entryPoint, scriptFile);
                    throw new ArgumentException(errorMsg);
                }
            }

            var parameters = new Dictionary<string, PSScriptParamInfo>(StringComparer.OrdinalIgnoreCase);
            if (paramAsts != null)
            {
                foreach (var paramAst in paramAsts)
                {
                    var psParamInfo = new PSScriptParamInfo(paramAst);
                    parameters.Add(psParamInfo.ParamName, psParamInfo);
                }
            }

            return parameters;
        }