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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataWeb / Server / System / Data / Services / Serializers / JsonReader.cs / 1305376 / JsonReader.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // //// Provides a reader implementaion for Json format // // // @owner [....] //--------------------------------------------------------------------- namespace System.Data.Services.Serializers { #region Namespaces. using System; using System.Collections; using System.Diagnostics; using System.Globalization; using System.IO; using System.Text; using System.Text.RegularExpressions; using System.Collections.Generic; #endregion Namespaces. ///Json text reader. ///Does not dispose the reader, since we don't own the underlying stream. internal sealed class JsonReader { ///Compiled Regex for DateTime Format. private static readonly Regex DateTimeFormat = new Regex(@"^/Date\((?-?[0-9]+)\)/", RegexOptions.Compiled); /// Maximum recursion limit on reader. private const int RecursionLimit = 200; ///Reader to reader text into private readonly StreamReader reader; ///Depth of recursion. private int recursionDepth; ////// Creates a new instance of Json reader which readers the json text /// from the given reader /// /// text reader from which json payload needs to be read. /// Does not dispose the reader, since we don't own the underlying stream. public JsonReader(StreamReader reader) { Debug.Assert(reader != null, "reader != null"); this.reader = reader; } ////// Converts the given value into the right type /// ///returns the clr object instance which public object ReadValue() { this.RecurseEnter(); object value = null; bool allowNull = false; char ch = this.PeekNextSignificantCharacter(); if (ch == '[') { value = this.ReadArray(); } else if (ch == '{') { value = this.ReadObject(); } else if ((ch == '\'') || (ch == '"')) { bool hasLeadingSlash; string s = this.ReadString(out hasLeadingSlash); value = s; // may be overwritten with a DateTime if ends up being a date/time // Atlas format for date/time if (hasLeadingSlash) { Match match = DateTimeFormat.Match(s); if (match.Success) { string ticksStr = match.Groups["ticks"].Value; long ticks; if (long.TryParse(ticksStr, NumberStyles.Integer, NumberFormatInfo.InvariantInfo, out ticks)) { // The javascript ticks start from 1/1/1970 but FX DateTime ticks start from 1/1/0001 DateTime dateTime = new DateTime(ticks * 10000 + JsonWriter.DatetimeMinTimeTicks, DateTimeKind.Utc); value = dateTime; } } } } else if (Char.IsDigit(ch) || (ch == '-') || (ch == '.')) { value = this.ReadNumber(); } else if ((ch == 't') || (ch == 'f')) { value = this.ReadBoolean(); } else if (ch == 'n') { this.ReadNull(); allowNull = true; } if ((value == null) && (allowNull == false)) { throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidContent); } this.RecurseLeave(); // if there is junk data at the end of the stream ex. {...}junk // then an exception will be thrown. if (this.recursionDepth == 0) { // at the end of the stream if (this.PeekNextSignificantCharacter() != '\0') { throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidContent); } } return value; } ////// Gets the next character from the reader. This function moves the enumerator by 1 position /// ///the next charater from the current reader position private char ReadNextCharacter() { int result = this.reader.Read(); if (result < 0) { throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidContent); } Debug.Assert(result <= char.MaxValue, "result <= char.MaxValue"); return (char)result; } ////// peeks the next character from the reader. This does not move the current reader position. /// ///the next character from the current reader position private char PeekNextCharacter() { if (this.reader.EndOfStream) { return '\0'; } int result = this.reader.Peek(); Debug.Assert(result >= 0, "Peek must not return value < 0 since we are not at EndOfStream yet."); Debug.Assert(result <= char.MaxValue, "result <= char.MaxValue"); return (char)result; } ////// Returns the next count characters from the reader's current position /// /// number of characters to return ///string consisting of next count characters private string GetCharacters(int count) { StringBuilder stringBuilder = new StringBuilder(); for (int i = 0; i < count; i++) { char ch = this.ReadNextCharacter(); stringBuilder.Append(ch); } return stringBuilder.ToString(); } ////// Sets the readers position to the next significant character position /// ///returns the next significant character without changing the current position of the reader private char PeekNextSignificantCharacter() { char ch = this.PeekNextCharacter(); while ((ch != '\0') && Char.IsWhiteSpace(ch)) { this.ReadNextCharacter(); ch = this.PeekNextCharacter(); } return ch; } ////// Converts the given text into an arrayList /// ///returns the arraylist containing the list of objects private ArrayList ReadArray() { ArrayList array = new ArrayList(); // Consume the '[' this.ReadNextCharacter(); while (true) { char ch = this.PeekNextSignificantCharacter(); if (ch == '\0') { throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidContent); } if (ch == ']') { this.ReadNextCharacter(); return array; } if (array.Count != 0) { if (ch != ',') { throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_MissingArrayMemberSeperator); } else { this.ReadNextCharacter(); } } object item = this.ReadValue(); array.Add(item); } } ////// Reads the boolean value /// ///returns the boolean value as read from the reader private bool ReadBoolean() { string s = this.ReadName(/* allowQuotes */ false); if (s != null) { if (s.Equals(XmlConstants.XmlTrueLiteral, StringComparison.Ordinal)) { return true; } else if (s.Equals(XmlConstants.XmlFalseLiteral, StringComparison.Ordinal)) { return false; } } throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidKeyword(s)); } ////// Reads the name string from the reader /// /// true, if you want to allow quotes, otherwise false ///string name value private string ReadName(bool allowQuotes) { char ch = this.PeekNextSignificantCharacter(); if ((ch == '"') || (ch == '\'')) { if (allowQuotes) { return this.ReadString(); } } else { StringBuilder sb = new StringBuilder(); while (true) { ch = this.PeekNextCharacter(); if ((ch == '_') || Char.IsLetterOrDigit(ch) || ch == '$') { this.ReadNextCharacter(); sb.Append(ch); } else { return sb.ToString(); } } } return null; } ////// Reads the null literal from the reader /// private void ReadNull() { string s = this.ReadName(/* allowQuotes */ false); if (s == null) { throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_MissingMemberName); } else if (!s.Equals("null", StringComparison.Ordinal)) { throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidKeyword(s)); } } ///Reads the number from the reader. ///reads the clr number object private object ReadNumber() { char ch = this.ReadNextCharacter(); StringBuilder sb = new StringBuilder(); sb.Append(ch); while (true) { ch = this.PeekNextSignificantCharacter(); if (Char.IsDigit(ch) || (ch == '.') || (ch == 'E') || (ch == 'e') || (ch == '-') || (ch == '+')) { this.ReadNextCharacter(); sb.Append(ch); } else { break; } } string s = sb.ToString(); Double doubleValue; int intValue; // We will first try and convert this int32. If this succeeds, great. Otherwise, we will try // and convert this into a double. if (Int32.TryParse(s, NumberStyles.Integer, NumberFormatInfo.InvariantInfo, out intValue)) { return intValue; } else if (Double.TryParse(s, NumberStyles.Float, NumberFormatInfo.InvariantInfo, out doubleValue)) { return doubleValue; } throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidContent); } ////// Reads the object from the reader /// ///returns hashtable containing the list of property names and values private JsonObjectRecords ReadObject() { JsonObjectRecords record = new JsonObjectRecords(); // Consume the '{' this.ReadNextCharacter(); while (true) { char ch = this.PeekNextSignificantCharacter(); if (ch == '\0') { // Unterminated Object literal throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidContent); } if (ch == '}') { this.ReadNextCharacter(); return record; } if (record.Count != 0) { if (ch != ',') { throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_MissingMemberSeperator); } else { this.ReadNextCharacter(); } } string name = this.ReadName(/* allowQuotes */ true); if (String.IsNullOrEmpty(name)) { throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidJsonNameSpecifiedOrExtraComma); } ch = this.PeekNextSignificantCharacter(); // Unexpected name/value pair syntax in object literal if (ch != ':') { throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_MissingNameValueSeperator(name)); } else { this.ReadNextCharacter(); } object item = this.ReadValue(); record.Add(name, item); } } ////// Read the string value from the reader /// ///returns the string value read from the reader private string ReadString() { bool dummy; return this.ReadString(out dummy); } ////// Read the string value from the reader /// /// out parameter indicating whether the string has a leading slash or not ///returns the string value read from the reader private string ReadString(out bool hasLeadingSlash) { char endQuoteCharacter = this.ReadNextCharacter(); char ch = this.ReadNextCharacter(); hasLeadingSlash = (ch == '\\') ? true : false; StringBuilder sb = new StringBuilder(); while (true) { if (ch == '\\') { ch = this.ReadNextCharacter(); // From 4627, section 2.5: Strings, here's the list of characters that we should be escaping if (ch == 'u') { string unicodeSequence = this.GetCharacters(4); Debug.Assert(unicodeSequence != null, "unicodeSequence != null"); ch = (char)Int32.Parse(unicodeSequence, NumberStyles.HexNumber, CultureInfo.InvariantCulture); sb.Append(ch); } else if (ch == 'b') { sb.Append('\b'); } else if (ch == 'f') { sb.Append('\f'); } else if (ch == 'n') { sb.Append('\n'); } else if (ch == 'r') { sb.Append('\r'); } else if (ch == 't') { sb.Append('\t'); } else if (ch == '\\' || ch == '\"' || ch == '/' || ch == '\'') { sb.Append(ch); } else { throw DataServiceException.CreateBadRequestError(Strings.BadRequestStream_InvalidJsonUnrecognizedEscapeSequence); } } else if (ch == endQuoteCharacter) { return sb.ToString(); } else { sb.Append(ch); } ch = this.ReadNextCharacter(); } } ///Marks the fact that a recursive method was entered, and checks that the depth is allowed. private void RecurseEnter() { WebUtil.RecurseEnter(RecursionLimit, ref this.recursionDepth); } ///Marks the fact that a recursive method is leaving.. private void RecurseLeave() { WebUtil.RecurseLeave(ref this.recursionDepth); } ////// Represent one Json Object. /// ///This class honors the original ordering of the inner elements of the json object. public class JsonObjectRecords { ////// A list of keys in the object /// private ListorderedKeys; /// /// The actual storage of key-value pair /// private Dictionaryentries; /// /// Constructor /// public JsonObjectRecords() { this.orderedKeys = new List(); this.entries = new Dictionary (EqualityComparer .Default); } /// /// Number of elements in this object /// public int Count { get { return this.orderedKeys.Count; } } ////// A list of keys in the object, in the order which they are deserialized /// public ListOrderedKeys { get { return this.orderedKeys; } } /// /// The actual storage of key-value pair /// public DictionaryEntries { get { return this.entries; } } /// /// Add a new element into the object /// /// Key /// Value public void Add(String key, Object value) { // Json Object used to be a hashtable // It will automatically resolve duplicated keys // however, for that scenario, we must not update the order table if (!this.entries.ContainsKey(key)) { this.orderedKeys.Add(key); } this.entries[key] = value; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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