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annotate Implab/Xml/XmlNameContext.cs @ 255:b00441e04738 v3

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Adde workaround to the behaviour of the logical operations stack in conjuction with async/await methods
author cin
date Wed, 04 Apr 2018 15:38:48 +0300
parents 5f7a3e1d32b9
children
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1 using System;
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2 using System.Collections.Generic;
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3 using System.Linq;
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4 using System.Text;
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5 using System.Threading.Tasks;
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6 using System.Xml;
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7
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8 namespace Implab.Xml {
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9 class XmlNameContext {
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10 public const string XmlnsNamespace = "http://www.w3.org/2000/xmlns/";
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11 public const string XmlnsPrefix = "xmlns";
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12 public const string XmlNamespace = "http://www.w3.org/XML/1998/namespace";
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13 public const string XmlPrefix = "xml";
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14 public const string XsiNamespace = "http://www.w3.org/2001/XMLSchema-instance";
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15 public const string XsiPrefix = "xsi";
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16
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17 readonly static char[] _qNameDelim = new[] { ':' };
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18
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19 Dictionary<string, string> m_ns2prefix;
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20 Dictionary<string, string> m_prefix2ns;
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21 int m_nextPrefix = 1;
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22 string m_lastNs;
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23 string m_lastPrefix;
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24
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25 public XmlNameContext ParentContext { get; private set; }
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26
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27 public int Depth { get; private set; }
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28
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29 public XmlNameContext(XmlNameContext parent, int depth) {
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30 ParentContext = parent;
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31 Depth = depth;
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32
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33 if (parent == null) {
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34 DefinePrefixNoCheck(XmlnsNamespace, XmlnsPrefix);
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35 DefinePrefixNoCheck(XmlNamespace, XmlPrefix);
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36 } else {
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37 m_nextPrefix = parent.m_nextPrefix;
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38 }
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39 }
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40
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41 public bool LookupNamespacePrefix(string ns, out string prefix) {
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42 if (ns == null)
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43 ns = string.Empty;
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44 if (ns == m_lastNs) {
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45 prefix = m_lastPrefix;
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46 return true;
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47 }
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49
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50 prefix = null;
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51 for (var ctx = this; ctx != null; ctx = ctx.ParentContext) {
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52 if (ctx.m_ns2prefix != null && ctx.m_ns2prefix.TryGetValue(ns, out prefix)) {
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53 m_lastNs = ns;
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54 m_lastPrefix = prefix;
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55 return true;
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56 }
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57 }
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58 return false;
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59 }
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60
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61 public string CreateNamespacePrefix(string ns) {
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62 var prefix = $"p{m_nextPrefix++}";
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63 DefinePrefixNoCheck(ns, prefix);
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64 return prefix;
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65 }
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66
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67 void DefinePrefixNoCheck(string ns, string prefix) {
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68 if (ns == null)
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69 ns = string.Empty;
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70 if (prefix == null)
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71 prefix = string.Empty;
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72
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73 if (m_ns2prefix == null)
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74 m_ns2prefix = new Dictionary<string, string>();
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75 m_ns2prefix[ns] = prefix;
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77 if (m_prefix2ns == null)
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78 m_prefix2ns = new Dictionary<string, string>();
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79 m_prefix2ns[prefix] = ns;
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80 }
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82 public void DefinePrefix(string ns, string prefix) {
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83 // according to https://www.w3.org/TR/xml-names/#ns-decl
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85 // It MUST NOT be declared . Other prefixes MUST NOT be bound to this namespace name, and it MUST NOT be declared as the default namespace
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86 if (ns == XmlnsNamespace)
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87 throw new Exception($"Attempt to define xmlns:{prefix}='{ns}'");
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88
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89 // It MAY, but need not, be declared, and MUST NOT be bound to any other namespace name
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90 if (ns == XmlNamespace && prefix != XmlPrefix)
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91 throw new Exception($"Attempt to define xmlns:{prefix}='{ns}'");
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92
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93 // add mapping
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94 DefinePrefixNoCheck(ns, prefix);
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95 }
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96
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97 public string ResolvePrefix(string prefix) {
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98 if (prefix == null)
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99 prefix = string.Empty;
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100 string ns = null;
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101 for(var ctx = this; ctx != null; ctx = ctx.ParentContext) {
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102 if (ctx.m_prefix2ns != null && ctx.m_prefix2ns.TryGetValue(prefix, out ns) == true)
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103 return ns;
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104 }
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105 return null;
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106 }
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107
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108 public XmlQualifiedName Resolve(string name) {
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109 Safe.ArgumentNotEmpty(name, nameof(name));
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110 var parts = name.Split(_qNameDelim, 2, StringSplitOptions.RemoveEmptyEntries);
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111
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112 if (parts.Length == 2) {
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113 return new XmlQualifiedName(parts[1], ResolvePrefix(parts[0]));
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114 } else {
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115 return new XmlQualifiedName(parts[0], ResolvePrefix(string.Empty));
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116 }
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117 }
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118 }
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119 }