GetAndRemoveRequiredNonEmptyStringAttribute() static private method

static private GetAndRemoveRequiredNonEmptyStringAttribute ( XmlNode node, string attrib, string &val ) : XmlNode
node System.Xml.XmlNode
attrib string
val string
return System.Xml.XmlNode
            private static IDictionary <string, string> GetProviderOptions(XmlNode compilerNode)
            {
                Dictionary <string, string> res = new Dictionary <string, string>();

                foreach (XmlNode child in compilerNode)
                {
                    if (child.Name != "providerOption")
                    {
                        HandlerBase.ThrowUnrecognizedElement(child);
                    }

                    string name = null, value = null;
                    HandlerBase.GetAndRemoveRequiredNonEmptyStringAttribute(child, "name", ref name);
                    HandlerBase.GetAndRemoveRequiredNonEmptyStringAttribute(child, "value", ref value);
                    HandlerBase.CheckForUnrecognizedAttributes(child);
                    HandlerBase.CheckForChildNodes(child);

                    res[name] = value;
                }

                return(res);
            }
            private static void ProcessCompilersElement(CodeDomCompilationConfiguration result, XmlNode node)
            {
                // reject attributes
                HandlerBase.CheckForUnrecognizedAttributes(node);

                String configFile = ConfigurationErrorsException.GetFilename(node);

                foreach (XmlNode child in node.ChildNodes)
                {
                    int configLineNumber = ConfigurationErrorsException.GetLineNumber(child);

                    // skip whitespace and comments
                    // reject nonelements
                    if (HandlerBase.IsIgnorableAlsoCheckForNonElement(child))
                    {
                        continue;
                    }

                    if (child.Name != "compiler")
                    {
                        HandlerBase.ThrowUnrecognizedElement(child);
                    }

                    String  languages    = String.Empty;
                    XmlNode languageNode = HandlerBase.GetAndRemoveRequiredNonEmptyStringAttribute(child, "language", ref languages);
                    String  extensions   = String.Empty;
                    HandlerBase.GetAndRemoveRequiredNonEmptyStringAttribute(child, "extension", ref extensions);
                    String compilerTypeName = null;
                    HandlerBase.GetAndRemoveRequiredNonEmptyStringAttribute(child, "type", ref compilerTypeName);

                    // Create a CompilerParameters for this compiler.
                    CompilerParameters compilerParams = new CompilerParameters();

                    int warningLevel = 0;
                    if (HandlerBase.GetAndRemoveNonNegativeIntegerAttribute(child, "warningLevel", ref warningLevel) != null)
                    {
                        compilerParams.WarningLevel = warningLevel;

                        // Need to be false if the warning level is 0
                        compilerParams.TreatWarningsAsErrors = (warningLevel > 0);
                    }
                    String compilerOptions = null;
                    if (HandlerBase.GetAndRemoveStringAttribute(child, "compilerOptions", ref compilerOptions) != null)
                    {
                        compilerParams.CompilerOptions = compilerOptions;
                    }

                    HandlerBase.CheckForUnrecognizedAttributes(child);
                    HandlerBase.CheckForChildNodes(child);

                    // Create a CompilerInfo structure for this compiler
                    CompilerInfo compilerInfo = new CompilerInfo(compilerParams, compilerTypeName);
                    compilerInfo.configFileName       = configFile;
                    compilerInfo.configFileLineNumber = configLineNumber;

                    // Parse the semicolon separated lists
                    string[] languageList  = languages.Split(s_fieldSeparators);
                    string[] extensionList = extensions.Split(s_fieldSeparators);

                    for (int i = 0; i < languageList.Length; i++)
                    {
                        languageList[i] = languageList[i].Trim();
                    }

                    for (int i = 0; i < extensionList.Length; i++)
                    {
                        extensionList[i] = extensionList[i].Trim();
                    }


                    // Validate language names, language names must have length and extensions must start with a period.
                    foreach (string language in languageList)
                    {
                        if (language.Length == 0)
                        {
                            throw new ConfigurationErrorsException(SR.GetString(SR.Language_Names_Cannot_Be_Empty));
                        }
                    }

                    foreach (string extension in extensionList)
                    {
                        if (extension.Length == 0 || extension[0] != '.')
                        {
                            throw new ConfigurationErrorsException(SR.GetString(SR.Extension_Names_Cannot_Be_Empty_Or_Non_Period_Based));
                        }
                    }


                    compilerInfo._compilerLanguages  = languageList;
                    compilerInfo._compilerExtensions = extensionList;

                    result.AddCompilerInfo(compilerInfo);
                }
                // Allow config options to replace redundant compiler entries
                result.RemoveUnmapped();
            }