Code:
/ DotNET / DotNET / 8.0 / untmp / Orcas / RTM / ndp / fx / src / xsp / System / Web / Extensions / Script / Serialization / JavaScriptObjectDeserializer.cs / 1 / JavaScriptObjectDeserializer.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- using System.Collections; using System.Collections.Generic; using System.Diagnostics; using System.Globalization; using System.Text; using System.Text.RegularExpressions; using System.Web.Resources; namespace System.Web.Script.Serialization { internal class JavaScriptObjectDeserializer { private const string DateTimePrefix = @"""\/Date("; private const int DateTimePrefixLength = 8; internal JavaScriptString _s; private JavaScriptSerializer _serializer; private int _depthLimit; internal static object BasicDeserialize(string input, int depthLimit, JavaScriptSerializer serializer) { JavaScriptObjectDeserializer jsod = new JavaScriptObjectDeserializer(input, depthLimit, serializer); object result = jsod.DeserializeInternal(0); if (jsod._s.GetNextNonEmptyChar() != null) { throw new ArgumentException(String.Format(CultureInfo.InvariantCulture, AtlasWeb.JSON_IllegalPrimitive, jsod._s.ToString())); } return result; } private JavaScriptObjectDeserializer(string input, int depthLimit, JavaScriptSerializer serializer) { _s = new JavaScriptString(input); _depthLimit = depthLimit; _serializer = serializer; } private object DeserializeInternal(int depth) { if (++depth > _depthLimit) { throw new ArgumentException(_s.GetDebugString(AtlasWeb.JSON_DepthLimitExceeded)); } Nullablec = _s.GetNextNonEmptyChar(); if (c == null) { return null; } _s.MovePrev(); if (IsNextElementDateTime()) { return DeserializeStringIntoDateTime(); } if (IsNextElementObject(c)) { IDictionary dict = DeserializeDictionary(depth); // Try to coerce objects to the right type if they have the __serverType if (dict.ContainsKey(JavaScriptSerializer.ServerTypeFieldName)) { return ObjectConverter.ConvertObjectToType(dict, null, _serializer); } return dict; } if (IsNextElementArray(c)) { return DeserializeList(depth); } if (IsNextElementString(c)) { return DeserializeString(); } return DeserializePrimitiveObject(); } private IList DeserializeList(int depth) { IList list = new ArrayList(); Nullable c = _s.MoveNext(); if (c != '[') { throw new ArgumentException(_s.GetDebugString(AtlasWeb.JSON_InvalidArrayStart)); } bool expectMore = false; while ((c = _s.GetNextNonEmptyChar()) != null && c != ']') { _s.MovePrev(); object o = DeserializeInternal(depth); list.Add(o); expectMore = false; // we might be done here. c = _s.GetNextNonEmptyChar(); if (c == ']') { break; } expectMore = true; if (c != ',') { throw new ArgumentException(_s.GetDebugString(AtlasWeb.JSON_InvalidArrayExpectComma)); } } if (expectMore) { throw new ArgumentException(_s.GetDebugString(AtlasWeb.JSON_InvalidArrayExtraComma)); } if (c != ']') { throw new ArgumentException(_s.GetDebugString(AtlasWeb.JSON_InvalidArrayEnd)); } return list; } private IDictionary DeserializeDictionary(int depth) { IDictionary dictionary = null; Nullable c = _s.MoveNext(); if (c != '{') { throw new ArgumentException(_s.GetDebugString(AtlasWeb.JSON_ExpectedOpenBrace)); } // Loop through each JSON entry in the input object while ((c = _s.GetNextNonEmptyChar()) != null) { _s.MovePrev(); if (c == ':') { throw new ArgumentException(_s.GetDebugString(AtlasWeb.JSON_InvalidMemberName)); } string memberName = null; if (c != '}') { // Find the member name memberName = DeserializeMemberName(); if (String.IsNullOrEmpty(memberName)) { throw new ArgumentException(_s.GetDebugString(AtlasWeb.JSON_InvalidMemberName)); } c = _s.GetNextNonEmptyChar(); if (c != ':') { throw new ArgumentException(_s.GetDebugString(AtlasWeb.JSON_InvalidObject)); } } if (dictionary == null) { dictionary = new Dictionary (); // If the object contains nothing (i.e. {}), we're done if (String.IsNullOrEmpty(memberName)) { // Move the cursor to the '}' character. c = _s.GetNextNonEmptyChar(); Debug.Assert(c == '}'); break; } } // Deserialize the property value. Here, we don't know its type object propVal = DeserializeInternal(depth); dictionary[memberName] = propVal; c = _s.GetNextNonEmptyChar(); if (c == '}') { break; } if (c != ',') { throw new ArgumentException(_s.GetDebugString(AtlasWeb.JSON_InvalidObject)); } } if (c != '}') { throw new ArgumentException(_s.GetDebugString(AtlasWeb.JSON_InvalidObject)); } return dictionary; } // Deserialize a member name. // e.g. { MemberName: ... } // e.g. { 'MemberName': ... } // e.g. { "MemberName": ... } private string DeserializeMemberName() { // It could be double quoted, single quoted, or not quoted at all Nullable c = _s.GetNextNonEmptyChar(); if (c == null) { return null; } _s.MovePrev(); // If it's quoted, treat it as a string if (IsNextElementString(c)) { return DeserializeString(); } // Non-quoted token return DeserializePrimitiveToken(); } private object DeserializePrimitiveObject() { string input = DeserializePrimitiveToken(); if (input.Equals("null")) { return null; } if (input.Equals("true")) { return true; } if (input.Equals("false")) { return false; } // Is it a floating point value bool hasDecimalPoint = input.IndexOf('.') >= 0; // DevDiv 56892: don't try to parse to Int32/64/Decimal if it has an exponent sign bool hasExponent = input.LastIndexOf("e", StringComparison.OrdinalIgnoreCase) >= 0; // [Last]IndexOf(char, StringComparison) overload doesn't exist, so search for "e" as a string not a char // Use 'Last'IndexOf since if there is an exponent it would be more quickly found starting from the end of the string // since 'e' is always toward the end of the number. e.g. 1.238907598768972987E82 if (!hasExponent) { // when no exponent, could be Int32, Int64, Decimal, and may fall back to Double // otherwise it must be Double if (!hasDecimalPoint) { // No decimal or exponent. All Int32 and Int64s fall into this category, so try them first // First try int int n; if (Int32.TryParse(input, NumberStyles.Integer, CultureInfo.InvariantCulture, out n)) { // NumberStyles.Integer: AllowLeadingWhite, AllowTrailingWhite, AllowLeadingSign return n; } // Then try a long long l; if (Int64.TryParse(input, NumberStyles.Integer, CultureInfo.InvariantCulture, out l)) { // NumberStyles.Integer: AllowLeadingWhite, AllowTrailingWhite, AllowLeadingSign return l; } } // No exponent, may or may not have a decimal (if it doesn't it couldn't be parsed into Int32/64) decimal dec; if (decimal.TryParse(input, NumberStyles.Number, CultureInfo.InvariantCulture, out dec)) { // NumberStyles.Number: AllowLeadingWhite, AllowTrailingWhite, AllowLeadingSign, // AllowTrailingSign, AllowDecimalPoint, AllowThousands return dec; } } // either we have an exponent or the number couldn't be parsed into any previous type. Double d; if (Double.TryParse(input, NumberStyles.Float, CultureInfo.InvariantCulture, out d)) { // NumberStyles.Float: AllowLeadingWhite, AllowTrailingWhite, AllowLeadingSign, AllowDecimalPoint, AllowExponent return d; } // must be an illegal primitive throw new ArgumentException(String.Format(CultureInfo.InvariantCulture, AtlasWeb.JSON_IllegalPrimitive, input)); } private string DeserializePrimitiveToken() { StringBuilder sb = new StringBuilder(); Nullable c = null; while ((c = _s.MoveNext()) != null) { if (Char.IsLetterOrDigit(c.Value) || c.Value == '.' || c.Value == '-' || c.Value == '_' || c.Value == '+') { sb.Append(c); } else { _s.MovePrev(); break; } } return sb.ToString(); } private string DeserializeString() { StringBuilder sb = new StringBuilder(); bool escapedChar = false; Nullable c = _s.MoveNext(); // First determine which quote is used by the string. Char quoteChar = CheckQuoteChar(c); while ((c = _s.MoveNext()) != null) { if (c == '\\') { if (escapedChar) { sb.Append('\\'); escapedChar = false; } else { escapedChar = true; } continue; } if (escapedChar) { AppendCharToBuilder(c, sb); escapedChar = false; } else { if (c == quoteChar) { return sb.ToString(); } sb.Append(c); } } throw new ArgumentException(_s.GetDebugString(AtlasWeb.JSON_UnterminatedString)); } private void AppendCharToBuilder(char? c, StringBuilder sb) { if (c == '"' || c == '\'' || c == '/') { sb.Append(c); } else if (c == 'b') { sb.Append('\b'); } else if (c == 'f') { sb.Append('\f'); } else if (c == 'n') { sb.Append('\n'); } else if (c == 'r') { sb.Append('\r'); } else if (c == 't') { sb.Append('\t'); } else if (c == 'u') { sb.Append((char)int.Parse(_s.MoveNext(4), NumberStyles.HexNumber, CultureInfo.InvariantCulture)); } else { throw new ArgumentException(_s.GetDebugString(AtlasWeb.JSON_BadEscape)); } } private char CheckQuoteChar(char? c) { Char quoteChar = '"'; if (c == '\'') { quoteChar = c.Value; } else if (c != '"') { // Fail if the string is not quoted. throw new ArgumentException(_s.GetDebugString(AtlasWeb.JSON_StringNotQuoted)); } return quoteChar; } private object DeserializeStringIntoDateTime() { // DivDiv 41127: Never confuse atlas serialized strings with dates. // DevDiv 74430: JavasciptSerializer will need to handle date time offset - following WCF design // serialized dates look like: "\/Date(123)\/" or "\/Date(123A)" or "Date(123+4567)" or Date(123-4567)" // the A, +14567, -4567 portion in the above example is ignored Match match = Regex.Match(_s.ToString(), @"^""\\/Date\((? -?[0-9]+)(?:[a-zA-Z]|(?:\+|-)[0-9]{4})?\)\\/"""); string ticksStr = match.Groups["ticks"].Value; long ticks; if (long.TryParse(ticksStr, out ticks)) { _s.MoveNext(match.Length); // The javascript ticks start from 1/1/1970 but FX DateTime ticks start from 1/1/0001 DateTime dt = new DateTime(ticks * 10000 + JavaScriptSerializer.DatetimeMinTimeTicks, DateTimeKind.Utc); return dt; } else { // If we failed to get a DateTime, treat it as a string return DeserializeString(); } } private static bool IsNextElementArray(Nullable c) { return c == '['; } private bool IsNextElementDateTime() { String next = _s.MoveNext(DateTimePrefixLength); if (next != null) { _s.MovePrev(DateTimePrefixLength); return String.Equals(next, DateTimePrefix, StringComparison.Ordinal); } return false; } private static bool IsNextElementObject(Nullable c) { return c == '{'; } private static bool IsNextElementString(Nullable c) { return c == '"' || c == '\''; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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