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using Implab.Formats.Json;
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Xml;
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namespace Implab.Xml {
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public class JsonXmlReader : XmlReader {
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struct JsonContext {
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public string localName;
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public bool skip;
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}
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JsonReader m_parser;
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JsonXmlReaderOptions m_options;
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JsonXmlReaderPosition m_position = JsonXmlReaderPosition.Initial;
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XmlNameTable m_nameTable;
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readonly string m_jsonRootName;
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readonly string m_jsonNamespace;
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readonly string m_jsonPrefix;
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readonly bool m_jsonFlattenArrays;
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readonly string m_jsonArrayItemName;
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string m_jsonLocalName;
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string m_jsonValueName;
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bool m_jsonSkip; // indicates wheather to generate closing tag for objects or arrays
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readonly Stack<JsonContext> m_jsonNameStack = new Stack<JsonContext>();
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XmlQualifiedName m_elementQName;
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string m_elementPrefix;
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int m_elementDepth;
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bool m_elementIsEmpty;
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XmlQualifiedName m_qName;
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string m_prefix;
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int m_xmlDepth;
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XmlSimpleAttribute[] m_attributes;
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string m_value;
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bool m_isEmpty;
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XmlNodeType m_nodeType = XmlNodeType.None;
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bool m_isAttribute; // indicates that we are reading attribute nodes
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int m_currentAttribute;
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bool m_currentAttributeRead;
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XmlNameContext m_context;
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readonly string m_xmlnsPrefix;
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readonly string m_xmlnsNamespace;
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readonly string m_xsiPrefix;
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readonly string m_xsiNamespace;
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readonly JsonXmlCaseTransform m_caseTransform;
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public JsonXmlReader(JsonReader parser, JsonXmlReaderOptions options) {
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Safe.ArgumentNotNull(parser, nameof(parser));
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m_parser = parser;
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m_options = options ?? new JsonXmlReaderOptions();
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m_jsonFlattenArrays = m_options.FlattenArrays;
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m_nameTable = m_options.NameTable ?? new NameTable();
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m_jsonRootName = m_nameTable.Add(string.IsNullOrEmpty(m_options.RootName) ? "data" : m_options.RootName);
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m_jsonArrayItemName = m_nameTable.Add(string.IsNullOrEmpty(m_options.ArrayItemName) ? "item" : m_options.ArrayItemName);
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m_jsonNamespace = m_nameTable.Add(m_options.NamespaceUri ?? string.Empty);
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m_jsonPrefix = m_nameTable.Add(m_options.NodesPrefix ?? string.Empty);
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m_xmlnsPrefix = m_nameTable.Add(XmlNameContext.XmlnsPrefix);
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m_xmlnsNamespace = m_nameTable.Add(XmlNameContext.XmlnsNamespace);
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m_xsiPrefix = m_nameTable.Add(XmlNameContext.XsiPrefix);
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m_xsiNamespace = m_nameTable.Add(XmlNameContext.XsiNamespace);
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m_caseTransform = m_options.CaseTransform;
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// TODO validate m_jsonRootName, m_jsonArrayItemName
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m_context = new XmlNameContext(null, 0);
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}
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public override int AttributeCount {
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get {
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return m_attributes == null ? 0 : m_attributes.Length;
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}
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}
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public override string BaseURI {
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get {
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return string.Empty;
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}
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}
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public override int Depth {
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get {
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return m_xmlDepth;
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}
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}
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public override bool EOF {
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get {
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return m_position == JsonXmlReaderPosition.Eof;
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}
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}
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public override bool IsEmptyElement {
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get { return m_isEmpty; }
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}
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public override string LocalName {
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get {
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return m_qName.Name;
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}
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}
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public override string NamespaceURI {
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get {
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return m_qName.Namespace;
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}
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}
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public override XmlNameTable NameTable {
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get {
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return m_nameTable;
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}
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}
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public override XmlNodeType NodeType {
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get {
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return m_nodeType;
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}
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}
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public override string Prefix {
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get {
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return m_prefix;
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}
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}
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public override ReadState ReadState {
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get {
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switch (m_position) {
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case JsonXmlReaderPosition.Initial:
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return ReadState.Initial;
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case JsonXmlReaderPosition.Eof:
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return ReadState.EndOfFile;
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case JsonXmlReaderPosition.Closed:
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return ReadState.Closed;
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case JsonXmlReaderPosition.Error:
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return ReadState.Error;
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default:
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return ReadState.Interactive;
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};
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}
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}
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public override string Value {
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get {
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return m_value;
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}
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}
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public override string GetAttribute(int i) {
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Safe.ArgumentInRange(i >= 0 && i < AttributeCount, nameof(i));
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return m_attributes[i].Value;
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}
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public override string GetAttribute(string name) {
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if (m_attributes == null)
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return null;
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var qName = m_context.Resolve(name);
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var attr = Array.Find(m_attributes, x => x.QName == qName);
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var value = attr?.Value;
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return value == string.Empty ? null : value;
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}
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public override string GetAttribute(string name, string namespaceURI) {
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if (m_attributes == null)
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return null;
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var qName = new XmlQualifiedName(name, namespaceURI);
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var attr = Array.Find(m_attributes, x => x.QName == qName);
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var value = attr?.Value;
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return value == string.Empty ? null : value;
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}
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public override string LookupNamespace(string prefix) {
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return m_context.ResolvePrefix(prefix);
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}
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public override bool MoveToAttribute(string name) {
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if (m_attributes == null || m_attributes.Length == 0)
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return false;
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var qName = m_context.Resolve(name);
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var index = Array.FindIndex(m_attributes, x => x.QName == qName);
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if (index >= 0) {
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MoveToAttributeImpl(index);
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return true;
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}
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return false;
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}
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public override bool MoveToAttribute(string name, string ns) {
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if (m_attributes == null || m_attributes.Length == 0)
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return false;
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var qName = m_context.Resolve(name);
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var index = Array.FindIndex(m_attributes, x => x.QName == qName);
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if (index >= 0) {
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MoveToAttributeImpl(index);
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return true;
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}
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return false;
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}
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void MoveToAttributeImpl(int i) {
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if (!m_isAttribute) {
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m_elementQName = m_qName;
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m_elementDepth = m_xmlDepth;
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m_elementPrefix = m_prefix;
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m_elementIsEmpty = m_isEmpty;
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m_isAttribute = true;
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}
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var attr = m_attributes[i];
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m_currentAttribute = i;
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m_currentAttributeRead = false;
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m_nodeType = XmlNodeType.Attribute;
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m_xmlDepth = m_elementDepth + 1;
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m_qName = attr.QName;
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m_value = attr.Value;
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m_prefix = attr.Prefix;
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}
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public override bool MoveToElement() {
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if (m_isAttribute) {
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m_value = null;
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m_nodeType = XmlNodeType.Element;
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m_xmlDepth = m_elementDepth;
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m_prefix = m_elementPrefix;
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m_qName = m_elementQName;
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m_isEmpty = m_elementIsEmpty;
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m_isAttribute = false;
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return true;
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}
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return false;
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}
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public override bool MoveToFirstAttribute() {
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if (m_attributes != null && m_attributes.Length > 0) {
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MoveToAttributeImpl(0);
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return true;
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}
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return false;
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}
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public override bool MoveToNextAttribute() {
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if (m_isAttribute) {
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var next = m_currentAttribute + 1;
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if (next < AttributeCount) {
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MoveToAttributeImpl(next);
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return true;
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}
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return false;
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} else {
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return MoveToFirstAttribute();
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}
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}
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public override bool ReadAttributeValue() {
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if (!m_isAttribute || m_currentAttributeRead)
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return false;
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ValueNode(m_attributes[m_currentAttribute].Value);
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m_currentAttributeRead = true;
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return true;
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}
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public override void ResolveEntity() {
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/* do nothing */
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}
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/// <summary>
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/// Determines do we need to increase depth after the current node
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/// </summary>
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/// <returns></returns>
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public bool IsSibling() {
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switch (m_nodeType) {
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case XmlNodeType.None: // start document
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case XmlNodeType.Attribute: // after attribute only it's content can be iterated with ReadAttributeValue method
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return false;
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case XmlNodeType.Element:
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// if the elemnt is empty the next element will be it's sibling
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return m_isEmpty;
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default:
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return true;
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}
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}
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void ValueNode(string value) {
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if (!IsSibling()) // the node is nested
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m_xmlDepth++;
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m_qName = XmlQualifiedName.Empty;
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m_nodeType = XmlNodeType.Text;
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m_prefix = string.Empty;
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m_value = value;
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m_isEmpty = false;
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m_attributes = null;
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}
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void ElementNode(string name, string ns, XmlSimpleAttribute[] attrs, bool empty) {
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if (!IsSibling()) // the node is nested
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m_xmlDepth++;
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var context = m_context;
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List<XmlSimpleAttribute> definedAttrs = null;
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// define new namespaces
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if (attrs != null) {
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foreach (var attr in attrs) {
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if (attr.QName.Name == "xmlns") {
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if (context == m_context)
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context = new XmlNameContext(m_context, m_xmlDepth);
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context.DefinePrefix(attr.Value, string.Empty);
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} else if (attr.Prefix == m_xmlnsPrefix) {
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if (context == m_context)
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context = new XmlNameContext(m_context, m_xmlDepth);
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context.DefinePrefix(attr.Value, attr.QName.Name);
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} else {
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string attrPrefix;
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if (string.IsNullOrEmpty(attr.QName.Namespace))
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continue;
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// auto-define prefixes
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if (!context.LookupNamespacePrefix(attr.QName.Namespace, out attrPrefix) || string.IsNullOrEmpty(attrPrefix)) {
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// new namespace prefix added
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attrPrefix = context.CreateNamespacePrefix(attr.QName.Namespace);
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attr.Prefix = attrPrefix;
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if (definedAttrs == null)
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definedAttrs = new List<XmlSimpleAttribute>();
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definedAttrs.Add(new XmlSimpleAttribute(attrPrefix, m_xmlnsNamespace, m_xmlnsPrefix, attr.QName.Namespace));
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}
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}
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}
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}
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string p;
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// auto-define prefixes
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if (!context.LookupNamespacePrefix(ns, out p)) {
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if (context == m_context)
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context = new XmlNameContext(m_context, m_xmlDepth);
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p = context.CreateNamespacePrefix(ns);
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if (definedAttrs == null)
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definedAttrs = new List<XmlSimpleAttribute>();
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definedAttrs.Add(new XmlSimpleAttribute(p, m_xmlnsNamespace, m_xmlnsPrefix, ns));
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}
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if (definedAttrs != null) {
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if (attrs != null)
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definedAttrs.AddRange(attrs);
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attrs = definedAttrs.ToArray();
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}
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if (!empty)
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m_context = context;
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m_nodeType = XmlNodeType.Element;
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m_qName = new XmlQualifiedName(name, ns);
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m_prefix = p;
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m_value = null;
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m_isEmpty = empty;
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m_attributes = attrs;
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}
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void EndElementNode(string name, string ns) {
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if (IsSibling()) {
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// closing the element which has children
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m_xmlDepth--;
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}
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string p;
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if (!m_context.LookupNamespacePrefix(ns, out p))
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throw new Exception($"Failed to lookup namespace '{ns}'");
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if (m_context.Depth == m_xmlDepth)
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m_context = m_context.ParentContext;
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m_nodeType = XmlNodeType.EndElement;
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m_prefix = p;
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m_qName = new XmlQualifiedName(name, ns);
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m_value = null;
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m_attributes = null;
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m_isEmpty = false;
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}
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void XmlDeclaration() {
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if (!IsSibling()) // the node is nested
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m_xmlDepth++;
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m_nodeType = XmlNodeType.XmlDeclaration;
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m_qName = new XmlQualifiedName("xml");
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m_value = "version='1.0'";
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m_prefix = string.Empty;
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m_attributes = null;
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m_isEmpty = false;
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}
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public override bool Read() {
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try {
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string elementName;
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XmlSimpleAttribute[] elementAttrs = null;
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MoveToElement();
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switch (m_position) {
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case JsonXmlReaderPosition.Initial:
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m_jsonLocalName = m_jsonRootName;
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m_jsonSkip = false;
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XmlDeclaration();
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m_position = JsonXmlReaderPosition.Declaration;
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return true;
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case JsonXmlReaderPosition.Declaration:
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elementAttrs = new[] {
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new XmlSimpleAttribute(m_xsiPrefix, m_xmlnsNamespace, m_xmlnsPrefix, m_xsiNamespace),
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string.IsNullOrEmpty(m_jsonPrefix) ?
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new XmlSimpleAttribute(m_xmlnsPrefix, string.Empty, string.Empty, m_jsonNamespace) :
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new XmlSimpleAttribute(m_jsonPrefix, m_xmlnsNamespace, m_xmlnsPrefix, m_jsonNamespace)
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};
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break;
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case JsonXmlReaderPosition.ValueElement:
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if (!m_isEmpty) {
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if (m_parser.ElementValue != null && !m_parser.ElementValue.Equals(string.Empty))
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ValueNode(m_parser.ElementValue);
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else
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goto case JsonXmlReaderPosition.ValueContent;
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m_position = JsonXmlReaderPosition.ValueContent;
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return true;
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} else {
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m_position = JsonXmlReaderPosition.ValueEndElement;
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break;
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}
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case JsonXmlReaderPosition.ValueContent:
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EndElementNode(m_jsonValueName, m_jsonNamespace);
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m_position = JsonXmlReaderPosition.ValueEndElement;
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return true;
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case JsonXmlReaderPosition.Eof:
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case JsonXmlReaderPosition.Closed:
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case JsonXmlReaderPosition.Error:
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return false;
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}
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while (m_parser.Read()) {
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var jsonName = m_nameTable.Add(TransformJsonName(m_parser.ElementName));
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switch (m_parser.ElementType) {
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case JsonElementType.BeginObject:
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if (!EnterJsonObject(jsonName, out elementName))
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continue;
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m_position = JsonXmlReaderPosition.BeginObject;
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ElementNode(elementName, m_jsonNamespace, elementAttrs, false);
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break;
|
|
|
case JsonElementType.EndObject:
|
|
|
if (!LeaveJsonScope(out elementName))
|
|
|
continue;
|
|
|
|
|
|
m_position = JsonXmlReaderPosition.EndObject;
|
|
|
EndElementNode(elementName, m_jsonNamespace);
|
|
|
break;
|
|
|
case JsonElementType.BeginArray:
|
|
|
if (!EnterJsonArray(jsonName, out elementName))
|
|
|
continue;
|
|
|
|
|
|
m_position = JsonXmlReaderPosition.BeginArray;
|
|
|
ElementNode(elementName, m_jsonNamespace, elementAttrs, false);
|
|
|
break;
|
|
|
case JsonElementType.EndArray:
|
|
|
if (!LeaveJsonScope(out elementName))
|
|
|
continue;
|
|
|
|
|
|
m_position = JsonXmlReaderPosition.EndArray;
|
|
|
EndElementNode(elementName, m_jsonNamespace);
|
|
|
break;
|
|
|
case JsonElementType.Value:
|
|
|
if (!VisitJsonValue(jsonName, out m_jsonValueName))
|
|
|
continue;
|
|
|
|
|
|
m_position = JsonXmlReaderPosition.ValueElement;
|
|
|
if (m_parser.ElementValue == null)
|
|
|
// generate empty element with xsi:nil="true" attribute
|
|
|
ElementNode(
|
|
|
m_jsonValueName,
|
|
|
m_jsonNamespace,
|
|
|
new[] {
|
|
|
new XmlSimpleAttribute("nil", m_xsiNamespace, m_xsiPrefix, "true")
|
|
|
},
|
|
|
true
|
|
|
);
|
|
|
else
|
|
|
ElementNode(m_jsonValueName, m_jsonNamespace, elementAttrs, m_parser.ElementValue.Equals(string.Empty));
|
|
|
break;
|
|
|
default:
|
|
|
throw new Exception($"Unexpected JSON element {m_parser.ElementType}: {m_parser.ElementName}");
|
|
|
}
|
|
|
return true;
|
|
|
}
|
|
|
|
|
|
m_position = JsonXmlReaderPosition.Eof;
|
|
|
return false;
|
|
|
} catch {
|
|
|
m_position = JsonXmlReaderPosition.Error;
|
|
|
throw;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
void SaveJsonName() {
|
|
|
m_jsonNameStack.Push(new JsonContext {
|
|
|
skip = m_jsonSkip,
|
|
|
localName = m_jsonLocalName
|
|
|
});
|
|
|
|
|
|
}
|
|
|
|
|
|
bool EnterJsonObject(string name, out string elementName) {
|
|
|
SaveJsonName();
|
|
|
m_jsonSkip = false;
|
|
|
|
|
|
if (string.IsNullOrEmpty(name)) {
|
|
|
if (m_jsonNameStack.Count != 1 && !m_jsonFlattenArrays)
|
|
|
m_jsonLocalName = m_jsonArrayItemName;
|
|
|
} else {
|
|
|
m_jsonLocalName = name;
|
|
|
}
|
|
|
|
|
|
elementName = m_jsonLocalName;
|
|
|
return true;
|
|
|
}
|
|
|
|
|
|
/// <summary>
|
|
|
/// Called when JSON parser visits BeginArray ('[') element.
|
|
|
/// </summary>
|
|
|
/// <param name="name">Optional property name if the array is the member of an object</param>
|
|
|
/// <returns>true if element should be emited, false otherwise</returns>
|
|
|
bool EnterJsonArray(string name, out string elementName) {
|
|
|
SaveJsonName();
|
|
|
|
|
|
if (string.IsNullOrEmpty(name)) {
|
|
|
// m_jsonNameStack.Count == 1 means the root node
|
|
|
if (m_jsonNameStack.Count != 1 && !m_jsonFlattenArrays)
|
|
|
m_jsonLocalName = m_jsonArrayItemName;
|
|
|
|
|
|
m_jsonSkip = false; // we should not flatten arrays inside arrays or in the document root
|
|
|
} else {
|
|
|
m_jsonLocalName = name;
|
|
|
m_jsonSkip = m_jsonFlattenArrays;
|
|
|
}
|
|
|
elementName = m_jsonLocalName;
|
|
|
|
|
|
return !m_jsonSkip;
|
|
|
}
|
|
|
|
|
|
bool VisitJsonValue(string name, out string elementName) {
|
|
|
if (string.IsNullOrEmpty(name)) {
|
|
|
// m_jsonNameStack.Count == 0 means that JSON document consists from simple value
|
|
|
elementName = (m_jsonNameStack.Count == 0 || m_jsonFlattenArrays) ? m_jsonLocalName : m_jsonArrayItemName;
|
|
|
} else {
|
|
|
elementName = name;
|
|
|
}
|
|
|
return true;
|
|
|
}
|
|
|
|
|
|
bool LeaveJsonScope(out string elementName) {
|
|
|
elementName = m_jsonLocalName;
|
|
|
var skip = m_jsonSkip;
|
|
|
|
|
|
var prev = m_jsonNameStack.Pop();
|
|
|
m_jsonLocalName = prev.localName;
|
|
|
m_jsonSkip = prev.skip;
|
|
|
|
|
|
return !skip;
|
|
|
}
|
|
|
|
|
|
private string TransformJsonName(string name) {
|
|
|
if (m_caseTransform == JsonXmlCaseTransform.None || string.IsNullOrEmpty(name)) {
|
|
|
return name;
|
|
|
} else if (m_caseTransform == JsonXmlCaseTransform.UcFirst) {
|
|
|
return JsonXmlReader.UppercaseFirst(name);
|
|
|
} else {
|
|
|
return JsonXmlReader.LowercaseFirst(name);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
protected override void Dispose(bool disposing) {
|
|
|
if (disposing)
|
|
|
Safe.Dispose(m_parser);
|
|
|
base.Dispose(true);
|
|
|
}
|
|
|
|
|
|
public override string ToString() {
|
|
|
switch (NodeType) {
|
|
|
case XmlNodeType.Element:
|
|
|
return $"<{Name} {string.Join(" ", (m_attributes ?? new XmlSimpleAttribute[0]).Select(x => $"{x.Prefix}{(string.IsNullOrEmpty(x.Prefix) ? "" : ":")}{x.QName.Name}='{x.Value}'"))} {(IsEmptyElement ? "/" : "")}>";
|
|
|
case XmlNodeType.Attribute:
|
|
|
return $"@{Name}";
|
|
|
case XmlNodeType.Text:
|
|
|
return $"{Value}";
|
|
|
case XmlNodeType.CDATA:
|
|
|
return $"<![CDATA[{Value}]]>";
|
|
|
case XmlNodeType.EntityReference:
|
|
|
return $"&{Name};";
|
|
|
case XmlNodeType.EndElement:
|
|
|
return $"</{Name}>";
|
|
|
default:
|
|
|
return $".{NodeType} {Name} {Value}";
|
|
|
}
|
|
|
}
|
|
|
|
|
|
#region static methods
|
|
|
|
|
|
//
|
|
|
// Static Methods
|
|
|
//
|
|
|
private static string LowercaseFirst(string s) {
|
|
|
char[] array = s.ToCharArray();
|
|
|
array[0] = char.ToLower(array[0]);
|
|
|
return new string(array);
|
|
|
}
|
|
|
|
|
|
private static string UppercaseFirst(string s) {
|
|
|
char[] array = s.ToCharArray();
|
|
|
array[0] = char.ToUpper(array[0]);
|
|
|
return new string(array);
|
|
|
}
|
|
|
|
|
|
public static JsonXmlReader CreateJsonXmlReader(TextReader textReader, JsonXmlReaderOptions options = null) {
|
|
|
var jsonReader = JsonReader.Create(textReader);
|
|
|
return new JsonXmlReader(jsonReader, options);
|
|
|
}
|
|
|
|
|
|
public static JsonXmlReader CreateJsonXmlReader(Stream stream, JsonXmlReaderOptions options = null) {
|
|
|
var jsonReader = JsonReader.Create(stream);
|
|
|
return new JsonXmlReader(jsonReader, options);
|
|
|
}
|
|
|
|
|
|
public static JsonXmlReader CreateJsonXmlReader(string file, JsonXmlReaderOptions options = null) {
|
|
|
var jsonReader = JsonReader.Create(file);
|
|
|
return new JsonXmlReader(jsonReader, options);
|
|
|
}
|
|
|
|
|
|
#endregion
|
|
|
}
|
|
|
}
|
|
|
|
