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annotate Implab/Xml/XmlNameContext.cs @ 227:8d5de4eb9c2c v2

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Reimplemented JsonXmlReader, added support for null values: JSON null values are mapped to empty nodes with 'xsi:nil' attribute set to 'true'
author cin
date Sat, 09 Sep 2017 03:53:13 +0300
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children 5f7a3e1d32b9
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227
8d5de4eb9c2c Reimplemented JsonXmlReader, added support for null values: JSON null values are
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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 public 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
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23 public XmlNameContext ParentContext { get; private set; }
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24
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25 public XmlNameContext(XmlNameContext parent) {
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26 ParentContext = parent;
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27 if (parent == null) {
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28 DefinePrefixNoCheck(XmlnsNamespace, XmlnsPrefix);
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29 DefinePrefixNoCheck(XmlNamespace, XmlPrefix);
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30 } else {
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31 m_nextPrefix = parent.m_nextPrefix;
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32 }
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33 }
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34
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35 public bool LookupNamespacePrefix(string ns, out string prefix) {
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36 if (ns == null)
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37 ns = string.Empty;
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38
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39 prefix = null;
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40 for (var ctx = this; ctx != null; ctx = ctx.ParentContext) {
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41 if (ctx.m_ns2prefix?.TryGetValue(ns, out prefix) == true) {
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42 if (ctx != this) // cache for the future use
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43 DefinePrefixNoCheck(ns, prefix);
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44 return true;
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45 }
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46 }
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47 return false;
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48 }
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49
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50 public string CreateNamespacePrefix(string ns) {
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51 var prefix = $"p{m_nextPrefix++}";
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52 DefinePrefixNoCheck(ns, prefix);
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53 return prefix;
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54 }
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55
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56 void DefinePrefixNoCheck(string ns, string prefix) {
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57 if (ns == null)
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58 ns = string.Empty;
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59 if (prefix == null)
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60 prefix = string.Empty;
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61
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62 if (m_ns2prefix == null)
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63 m_ns2prefix = new Dictionary<string, string>();
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64 m_ns2prefix[ns] = prefix;
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65
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66 if (m_prefix2ns == null)
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67 m_prefix2ns = new Dictionary<string, string>();
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68 m_prefix2ns[prefix] = ns;
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69 }
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70
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71 public void DefinePrefix(string ns, string prefix) {
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72 // according to https://www.w3.org/TR/xml-names/#ns-decl
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73
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74 // 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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75 if (ns == XmlnsNamespace)
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76 throw new Exception($"Attempt to define xmlns:{prefix}='{ns}'");
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77
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78 // It MAY, but need not, be declared, and MUST NOT be bound to any other namespace name
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79 if (ns == XmlNamespace && prefix != XmlPrefix)
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80 throw new Exception($"Attempt to define xmlns:{prefix}='{ns}'");
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81
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82 // add mapping
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83 DefinePrefixNoCheck(ns, prefix);
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84 }
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85
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86 public string ResolvePrefix(string prefix) {
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87 if (prefix == null)
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88 prefix = string.Empty;
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89 string ns = null;
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90 for(var ctx = this; ctx != null; ctx = ctx.ParentContext) {
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91 if (ctx.m_prefix2ns?.TryGetValue(prefix, out ns) == true) {
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92 if (ctx != this) // cache for the future use
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93 DefinePrefixNoCheck(ns, prefix);
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94 return ns;
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95 }
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96 }
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97 return null;
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98 }
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99
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100 public XmlQualifiedName Resolve(string name) {
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101 Safe.ArgumentNotEmpty(name, nameof(name));
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102 var parts = name.Split(_qNameDelim, 2, StringSplitOptions.RemoveEmptyEntries);
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103
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104 if (parts.Length == 2) {
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105 return new XmlQualifiedName(parts[1], ResolvePrefix(parts[0]));
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106 } else {
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107 return new XmlQualifiedName(parts[0], ResolvePrefix(string.Empty));
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108 }
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109 }
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110 }
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111 }