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