mcs/class/referencesource/System.Data.SqlXml/System/Xml/Xsl/XsltOld/PrefixQname.cs

   1 //------------------------------------------------------------------------------
   2 // <copyright file="PrefixQName.cs" company="Microsoft">
   3 //     Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 // <owner current="true" primary="true">Microsoft</owner>
   6 //------------------------------------------------------------------------------
   7
   8 namespace System.Xml.Xsl.XsltOld {
   9     using Res = System.Xml.Utils.Res;
  10     using System;
  11     using System.Diagnostics;
  12     using System.Xml;
  13
  14     internal sealed class PrefixQName {
  15         public string Prefix;
  16         public string Name;
  17         public string Namespace;
  18
  19         internal void ClearPrefix() {
  20             Prefix = string.Empty;
  21         }
  22
  23         internal void SetQName(string qname) {
  24             PrefixQName.ParseQualifiedName(qname, out Prefix, out Name);
  25         }
  26
  27         //
  28         // Parsing qualified names
  29         //
  30
  31         public static void ParseQualifiedName(string qname, out string prefix, out string local) {
  32             Debug.Assert(qname != null);
  33             prefix = string.Empty;
  34             local = string.Empty;
  35
  36             // parse first NCName (prefix or local name)
  37             int position = ValidateNames.ParseNCName(qname);
  38             if (position == 0) {
  39                 throw XsltException.Create(Res.Xslt_InvalidQName, qname);
  40             }
  41             local = qname.Substring(0, position);
  42
  43             // not at the end -> parse ':' and the second NCName (local name)
  44             if (position < qname.Length) {
  45                 if (qname[position] == ':') {
  46                     int startLocalNamePos = ++position;
  47                     prefix = local;
  48                     int len = ValidateNames.ParseNCName(qname, position);
  49                     position += len;
  50                     if (len == 0) {
  51                         throw XsltException.Create(Res.Xslt_InvalidQName, qname);
  52                     }
  53                     local = qname.Substring(startLocalNamePos, len);
  54                 }
  55
  56                 // still not at the end -> error
  57                 if (position < qname.Length) {
  58                     throw XsltException.Create(Res.Xslt_InvalidQName, qname);
  59                 }
  60             }
  61         }
  62
  63         public static bool ValidatePrefix(string prefix) {
  64             if (prefix.Length == 0) {
  65                 return false;
  66             }
  67             int endPos = ValidateNames.ParseNCName(prefix, 0);
  68             return endPos == prefix.Length;
  69         }
  70     }
  71 }