XmlNameContext.cs
116 lines
| 4.2 KiB
| text/x-csharp
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r289 | using System; | ||
| using System.Collections.Generic; | ||||
| using System.Xml; | ||||
| namespace Implab.Xml { | ||||
| class XmlNameContext { | ||||
| public const string XmlnsNamespace = "http://www.w3.org/2000/xmlns/"; | ||||
| public const string XmlnsPrefix = "xmlns"; | ||||
| public const string XmlNamespace = "http://www.w3.org/XML/1998/namespace"; | ||||
| public const string XmlPrefix = "xml"; | ||||
| public const string XsiNamespace = "http://www.w3.org/2001/XMLSchema-instance"; | ||||
| public const string XsiPrefix = "xsi"; | ||||
| readonly static char[] _qNameDelim = new[] { ':' }; | ||||
| Dictionary<string, string> m_ns2prefix; | ||||
| Dictionary<string, string> m_prefix2ns; | ||||
| int m_nextPrefix = 1; | ||||
| string m_lastNs; | ||||
| string m_lastPrefix; | ||||
| public XmlNameContext ParentContext { get; private set; } | ||||
| public int Depth { get; private set; } | ||||
| public XmlNameContext(XmlNameContext parent, int depth) { | ||||
| ParentContext = parent; | ||||
| Depth = depth; | ||||
| if (parent == null) { | ||||
| DefinePrefixNoCheck(XmlnsNamespace, XmlnsPrefix); | ||||
| DefinePrefixNoCheck(XmlNamespace, XmlPrefix); | ||||
| } else { | ||||
| m_nextPrefix = parent.m_nextPrefix; | ||||
| } | ||||
| } | ||||
| public bool LookupNamespacePrefix(string ns, out string prefix) { | ||||
| if (ns == null) | ||||
| ns = string.Empty; | ||||
| if (ns == m_lastNs) { | ||||
| prefix = m_lastPrefix; | ||||
| return true; | ||||
| } | ||||
| prefix = null; | ||||
| for (var ctx = this; ctx != null; ctx = ctx.ParentContext) { | ||||
| if (ctx.m_ns2prefix != null && ctx.m_ns2prefix.TryGetValue(ns, out prefix)) { | ||||
| m_lastNs = ns; | ||||
| m_lastPrefix = prefix; | ||||
| return true; | ||||
| } | ||||
| } | ||||
| return false; | ||||
| } | ||||
| public string CreateNamespacePrefix(string ns) { | ||||
| var prefix = $"p{m_nextPrefix++}"; | ||||
| DefinePrefixNoCheck(ns, prefix); | ||||
| return prefix; | ||||
| } | ||||
| void DefinePrefixNoCheck(string ns, string prefix) { | ||||
| if (ns == null) | ||||
| ns = string.Empty; | ||||
| if (prefix == null) | ||||
| prefix = string.Empty; | ||||
| if (m_ns2prefix == null) | ||||
| m_ns2prefix = new Dictionary<string, string>(); | ||||
| m_ns2prefix[ns] = prefix; | ||||
| if (m_prefix2ns == null) | ||||
| m_prefix2ns = new Dictionary<string, string>(); | ||||
| m_prefix2ns[prefix] = ns; | ||||
| } | ||||
| public void DefinePrefix(string ns, string prefix) { | ||||
| // according to https://www.w3.org/TR/xml-names/#ns-decl | ||||
| // It MUST NOT be declared . Other prefixes MUST NOT be bound to this namespace name, and it MUST NOT be declared as the default namespace | ||||
| if (ns == XmlnsNamespace) | ||||
| throw new Exception($"Attempt to define xmlns:{prefix}='{ns}'"); | ||||
| // It MAY, but need not, be declared, and MUST NOT be bound to any other namespace name | ||||
| if (ns == XmlNamespace && prefix != XmlPrefix) | ||||
| throw new Exception($"Attempt to define xmlns:{prefix}='{ns}'"); | ||||
| // add mapping | ||||
| DefinePrefixNoCheck(ns, prefix); | ||||
| } | ||||
| public string ResolvePrefix(string prefix) { | ||||
| if (prefix == null) | ||||
| prefix = string.Empty; | ||||
| string ns = null; | ||||
| for(var ctx = this; ctx != null; ctx = ctx.ParentContext) { | ||||
| if (ctx.m_prefix2ns != null && ctx.m_prefix2ns.TryGetValue(prefix, out ns) == true) | ||||
| return ns; | ||||
| } | ||||
| return null; | ||||
| } | ||||
| public XmlQualifiedName Resolve(string name) { | ||||
| Safe.ArgumentNotEmpty(name, nameof(name)); | ||||
| var parts = name.Split(_qNameDelim, 2, StringSplitOptions.RemoveEmptyEntries); | ||||
| if (parts.Length == 2) { | ||||
| return new XmlQualifiedName(parts[1], ResolvePrefix(parts[0])); | ||||
| } else { | ||||
| return new XmlQualifiedName(parts[0], ResolvePrefix(string.Empty)); | ||||
| } | ||||
| } | ||||
| } | ||||
| } | ||||