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using Implab;
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.IO;
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using System.Xml;
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namespace Implab.Formats.JSON {
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public class JSONXmlReader : XmlReader {
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enum ValueContext {
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Undefined,
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ElementStart,
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ElementValue,
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ElementEnd,
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ElementEmpty
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}
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struct LocalNameContext {
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public string localName;
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public bool isArray;
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}
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JSONParser m_parser;
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ValueContext m_valueContext;
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ReadState m_state = ReadState.Initial;
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Stack<LocalNameContext> m_localNameStack = new Stack<LocalNameContext>();
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LocalNameContext m_localName;
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int m_depthCorrection;
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readonly string m_rootName;
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readonly string m_prefix;
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readonly string m_namespaceUri;
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readonly bool m_flattenArrays;
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readonly string m_arrayItemName;
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readonly XmlNameTable m_nameTable;
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JSONXmlReader(JSONParser parser, JSONXmlReaderOptions options) {
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m_parser = parser;
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if (options != null) {
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m_prefix = options.NodesPrefix ?? String.Empty;
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m_namespaceUri = options.NamespaceURI ?? String.Empty;
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m_rootName = options.RootName ?? "json";
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m_flattenArrays = options.FlattenArrays;
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m_arrayItemName = options.ArrayItemName ?? "item";
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m_nameTable = options.NameTable ?? new NameTable();
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} else {
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m_prefix = String.Empty;
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m_namespaceUri = String.Empty;
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m_rootName = "json";
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m_flattenArrays = false;
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m_arrayItemName = "item";
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m_nameTable = new NameTable();
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}
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}
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/// <summary>
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/// Always 0, JSON doesn't support attributes
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/// </summary>
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public override int AttributeCount {
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get { return 0; }
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}
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public override string BaseURI {
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get { return String.Empty; }
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}
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public override int Depth {
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get {
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return m_localNameStack.Count + m_depthCorrection;
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}
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}
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public override bool EOF {
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get { return m_parser.EOF; }
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}
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/// <summary>
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/// Always throws an exception
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/// </summary>
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/// <param name="i"></param>
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/// <returns></returns>
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public override string GetAttribute(int i) {
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throw new ArgumentOutOfRangeException();
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}
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/// <summary>
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/// Always returns empty string
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/// </summary>
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/// <param name="name"></param>
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/// <param name="namespaceURI"></param>
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/// <returns></returns>
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public override string GetAttribute(string name, string namespaceURI) {
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return String.Empty;
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}
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/// <summary>
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/// Always returns empty string
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/// </summary>
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/// <param name="name"></param>
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/// <returns></returns>
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public override string GetAttribute(string name) {
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return String.Empty;
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}
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public override bool IsEmptyElement {
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get { return m_parser.ElementType == JSONElementType.Value && m_valueContext == ValueContext.ElementEmpty; }
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}
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public override string LocalName {
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get { return m_localName.localName; }
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}
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public override string LookupNamespace(string prefix) {
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if (String.IsNullOrEmpty(prefix) || prefix == m_prefix)
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return m_namespaceUri;
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return String.Empty;
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}
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public override bool MoveToAttribute(string name, string ns) {
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return false;
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}
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public override bool MoveToAttribute(string name) {
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return false;
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}
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public override bool MoveToElement() {
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return false;
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}
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public override bool MoveToFirstAttribute() {
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return false;
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}
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public override bool MoveToNextAttribute() {
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return false;
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}
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public override XmlNameTable NameTable {
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get { return m_nameTable; }
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}
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public override string NamespaceURI {
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get { return m_namespaceUri; }
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}
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public override XmlNodeType NodeType {
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get {
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switch (m_parser.ElementType) {
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case JSONElementType.BeginObject:
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case JSONElementType.BeginArray:
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return XmlNodeType.Element;
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case JSONElementType.EndObject:
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case JSONElementType.EndArray:
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return XmlNodeType.EndElement;
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case JSONElementType.Value:
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switch (m_valueContext) {
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case ValueContext.ElementStart:
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case ValueContext.ElementEmpty:
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return XmlNodeType.Element;
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case ValueContext.ElementValue:
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return XmlNodeType.Text;
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case ValueContext.ElementEnd:
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return XmlNodeType.EndElement;
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default:
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throw new InvalidOperationException();
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}
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default:
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throw new InvalidOperationException();
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}
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}
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}
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public override string Prefix {
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get { return m_prefix; }
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}
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public override bool Read() {
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if (m_state != ReadState.Interactive && m_state != ReadState.Initial)
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return false;
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if (m_state == ReadState.Initial)
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m_state = ReadState.Interactive;
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try {
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switch (m_parser.ElementType) {
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case JSONElementType.Value:
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switch (m_valueContext) {
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case ValueContext.ElementStart:
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SetLocalName(String.Empty);
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m_valueContext = ValueContext.ElementValue;
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return true;
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case ValueContext.ElementValue:
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RestoreLocalName();
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m_valueContext = ValueContext.ElementEnd;
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return true;
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case ValueContext.ElementEmpty:
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case ValueContext.ElementEnd:
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RestoreLocalName();
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break;
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}
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break;
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case JSONElementType.EndArray:
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case JSONElementType.EndObject:
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RestoreLocalName();
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break;
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}
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string itemName = m_parser.ElementType == JSONElementType.None ? m_rootName : m_flattenArrays ? m_localName.localName : m_arrayItemName;
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while (m_parser.Read()) {
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if (!String.IsNullOrEmpty(m_parser.ElementName))
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itemName = m_parser.ElementName;
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switch (m_parser.ElementType) {
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case JSONElementType.BeginArray:
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if (m_flattenArrays && !m_localName.isArray) {
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m_depthCorrection--;
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SetLocalName(itemName, true);
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continue;
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}
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SetLocalName(itemName, true);
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break;
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case JSONElementType.BeginObject:
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SetLocalName(itemName);
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break;
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case JSONElementType.EndArray:
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if (m_flattenArrays && !m_localNameStack.Peek().isArray) {
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RestoreLocalName();
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m_depthCorrection++;
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continue;
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}
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break;
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case JSONElementType.EndObject:
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break;
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case JSONElementType.Value:
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SetLocalName(itemName);
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m_valueContext = m_parser.ElementValue == null ? ValueContext.ElementEmpty : ValueContext.ElementStart;
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break;
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}
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return true;
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}
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m_state = ReadState.EndOfFile;
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return false;
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} catch {
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m_state = ReadState.Error;
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throw;
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}
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}
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public override bool ReadAttributeValue() {
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return false;
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}
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public override ReadState ReadState {
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get { return m_state; }
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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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public override string Value {
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get {
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if (m_parser.ElementValue == null)
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return String.Empty;
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if (Convert.GetTypeCode(m_parser.ElementValue) == TypeCode.Double)
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return ((double)m_parser.ElementValue).ToString(CultureInfo.InvariantCulture);
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return m_parser.ElementValue.ToString();
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}
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}
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void SetLocalName(string name) {
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m_localNameStack.Push(m_localName);
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m_localName.localName = name;
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m_localName.isArray = false;
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}
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void SetLocalName(string name, bool isArray) {
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m_localNameStack.Push(m_localName);
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m_localName.localName = name;
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m_localName.isArray = isArray;
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}
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void RestoreLocalName() {
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m_localName = m_localNameStack.Pop();
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}
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public override void Close() {
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}
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protected override void Dispose(bool disposing) {
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#if MONO
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disposing = true;
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#endif
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if (disposing) {
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m_parser.Dispose();
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}
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base.Dispose(disposing);
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}
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public static JSONXmlReader Create(string file, JSONXmlReaderOptions options) {
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return Create(File.OpenText(file), options);
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}
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/// <summary>
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/// Creates the XmlReader for the specified text stream with JSON data.
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/// </summary>
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/// <param name="reader">Text reader.</param>
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/// <param name="options">Options.</param>
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/// <remarks>
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/// The reader will be disposed when the XmlReader is disposed.
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/// </remarks>
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public static JSONXmlReader Create(TextReader reader, JSONXmlReaderOptions options) {
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return new JSONXmlReader(new JSONParser(reader), options);
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}
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/// <summary>
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/// Creates the XmlReader for the specified stream with JSON data.
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/// </summary>
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/// <param name="stream">Stream.</param>
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/// <param name="options">Options.</param>
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/// <remarks>
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/// The stream will be disposed when the XmlReader is disposed.
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/// </remarks>
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public static JSONXmlReader Create(Stream stream, JSONXmlReaderOptions options) {
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Safe.ArgumentNotNull(stream, "stream");
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// HACK don't dispose StreaReader to keep stream opened
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return Create(new StreamReader(stream), options);
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}
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}
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}
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