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Copy pathXMiniJSON.cs
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738 lines (621 loc) · 14.2 KB
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using System;
using System.Collections;
using System.Text;
using System.Collections.Generic;
/* Based on the JSON parser from
* http://techblog.procurios.nl/k/618/news/view/14605/14863/How-do-I-write-my-own-parser-for-JSON.html
*
* I simplified it so that it doesn't throw exceptions
* and can be used in Unity iPhone with maximum code stripping.
*/
/// <summary>
/// This class encodes and decodes JSON strings.
/// Spec. details, see http://www.json.org/
///
/// JSON uses Arrays and Objects. These correspond here to the datatypes ArrayList and Hashtable.
/// All numbers are parsed to doubles.
/// </summary>
public class XMiniJSON
{
private const int TOKEN_NONE = 0;
private const int TOKEN_CURLY_OPEN = 1;
private const int TOKEN_CURLY_CLOSE = 2;
private const int TOKEN_SQUARED_OPEN = 3;
private const int TOKEN_SQUARED_CLOSE = 4;
private const int TOKEN_COLON = 5;
private const int TOKEN_COMMA = 6;
private const int TOKEN_STRING = 7;
private const int TOKEN_NUMBER = 8;
private const int TOKEN_TRUE = 9;
private const int TOKEN_FALSE = 10;
private const int TOKEN_NULL = 11;
private const int BUILDER_CAPACITY = 2000;
/// <summary>
/// On decoding, this value holds the position at which the parse failed (-1 = no error).
/// </summary>
protected static int lastErrorIndex = -1;
protected static string lastDecode = "";
/// <summary>
/// Parses the string json into a value
/// </summary>
/// <param name="json">A JSON string.</param>
/// <returns>An ArrayList, a Hashtable, a double, a string, null, true, or false</returns>
public static object jsonDecode(string json)
{
// save the string for debug information
XMiniJSON.lastDecode = json;
if (json != null)
{
char[] charArray = json.ToCharArray();
int index = 0;
bool success = true;
object value = XMiniJSON.parseValue(charArray, ref index, ref success);
if (success)
XMiniJSON.lastErrorIndex = -1;
else
XMiniJSON.lastErrorIndex = index;
return value;
}
else
{
return null;
}
}
/// <summary>
/// Converts a Hashtable / ArrayList / Dictionary(string,string) object into a JSON string
/// </summary>
/// <param name="json">A Hashtable / ArrayList</param>
/// <returns>A JSON encoded string, or null if object 'json' is not serializable</returns>
public static string jsonEncode(object json)
{
var builder = new StringBuilder(BUILDER_CAPACITY);
var success = XMiniJSON.serializeValue(json, builder);
return (success ? builder.ToString() : null);
}
/// <summary>
/// On decoding, this function returns the position at which the parse failed (-1 = no error).
/// </summary>
/// <returns></returns>
public static bool lastDecodeSuccessful()
{
return (XMiniJSON.lastErrorIndex == -1);
}
/// <summary>
/// On decoding, this function returns the position at which the parse failed (-1 = no error).
/// </summary>
/// <returns></returns>
public static int getLastErrorIndex()
{
return XMiniJSON.lastErrorIndex;
}
/// <summary>
/// If a decoding error occurred, this function returns a piece of the JSON string
/// at which the error took place. To ease debugging.
/// </summary>
/// <returns></returns>
public static string getLastErrorSnippet()
{
if (XMiniJSON.lastErrorIndex == -1)
{
return "";
}
else
{
int startIndex = XMiniJSON.lastErrorIndex - 5;
int endIndex = XMiniJSON.lastErrorIndex + 15;
if (startIndex < 0)
startIndex = 0;
if (endIndex >= XMiniJSON.lastDecode.Length)
endIndex = XMiniJSON.lastDecode.Length - 1;
return XMiniJSON.lastDecode.Substring(startIndex, endIndex - startIndex + 1);
}
}
#region Parsing
protected static Hashtable parseObject(char[] json, ref int index)
{
Hashtable table = new Hashtable();
int token;
// {
nextToken(json, ref index);
bool done = false;
while (!done)
{
token = lookAhead(json, index);
if (token == XMiniJSON.TOKEN_NONE)
{
return null;
}
else if (token == XMiniJSON.TOKEN_COMMA)
{
nextToken(json, ref index);
}
else if (token == XMiniJSON.TOKEN_CURLY_CLOSE)
{
nextToken(json, ref index);
return table;
}
else
{
// name
string name = parseString(json, ref index);
if (name == null)
{
return null;
}
// :
token = nextToken(json, ref index);
if (token != XMiniJSON.TOKEN_COLON)
return null;
// value
bool success = true;
object value = parseValue(json, ref index, ref success);
if (!success)
return null;
table[name] = value;
}
}
return table;
}
protected static ArrayList parseArray(char[] json, ref int index)
{
ArrayList array = new ArrayList();
// [
nextToken(json, ref index);
bool done = false;
while (!done)
{
int token = lookAhead(json, index);
if (token == XMiniJSON.TOKEN_NONE)
{
return null;
}
else if (token == XMiniJSON.TOKEN_COMMA)
{
nextToken(json, ref index);
}
else if (token == XMiniJSON.TOKEN_SQUARED_CLOSE)
{
nextToken(json, ref index);
break;
}
else
{
bool success = true;
object value = parseValue(json, ref index, ref success);
if (!success)
return null;
array.Add(value);
}
}
return array;
}
protected static object parseValue(char[] json, ref int index, ref bool success)
{
switch (lookAhead(json, index))
{
case XMiniJSON.TOKEN_STRING:
return parseString(json, ref index);
case XMiniJSON.TOKEN_NUMBER:
return parseNumber(json, ref index);
case XMiniJSON.TOKEN_CURLY_OPEN:
return parseObject(json, ref index);
case XMiniJSON.TOKEN_SQUARED_OPEN:
return parseArray(json, ref index);
case XMiniJSON.TOKEN_TRUE:
nextToken(json, ref index);
return Boolean.Parse("TRUE");
case XMiniJSON.TOKEN_FALSE:
nextToken(json, ref index);
return Boolean.Parse("FALSE");
case XMiniJSON.TOKEN_NULL:
nextToken(json, ref index);
return null;
case XMiniJSON.TOKEN_NONE:
break;
}
success = false;
return null;
}
protected static string parseString(char[] json, ref int index)
{
string s = "";
char c;
eatWhitespace(json, ref index);
// "
c = json[index++];
bool complete = false;
while (!complete)
{
if (index == json.Length)
break;
c = json[index++];
if (c == '"')
{
complete = true;
break;
}
else if (c == '\\')
{
if (index == json.Length)
break;
c = json[index++];
if (c == '"')
{
s += '"';
}
else if (c == '\\')
{
s += '\\';
}
else if (c == '/')
{
s += '/';
}
else if (c == 'b')
{
s += '\b';
}
else if (c == 'f')
{
s += '\f';
}
else if (c == 'n')
{
s += '\n';
}
else if (c == 'r')
{
s += '\r';
}
else if (c == 't')
{
s += '\t';
}
else if (c == 'u')
{
int remainingLength = json.Length - index;
if (remainingLength >= 4)
{
char[] unicodeCharArray = new char[4];
Array.Copy(json, index, unicodeCharArray, 0, 4);
// Drop in the HTML markup for the unicode character
s += "&#x" + new string(unicodeCharArray) + ";";
/*
uint codePoint = UInt32.Parse(new string(unicodeCharArray), NumberStyles.HexNumber);
// convert the integer codepoint to a unicode char and add to string
s += Char.ConvertFromUtf32((int)codePoint);
*/
// skip 4 chars
index += 4;
}
else
{
break;
}
}
}
else
{
s += c;
}
}
if (!complete)
return null;
return s;
}
protected static double parseNumber(char[] json, ref int index)
{
eatWhitespace(json, ref index);
int lastIndex = getLastIndexOfNumber(json, index);
int charLength = (lastIndex - index) + 1;
char[] numberCharArray = new char[charLength];
Array.Copy(json, index, numberCharArray, 0, charLength);
index = lastIndex + 1;
return Double.Parse(new string(numberCharArray)); // , CultureInfo.InvariantCulture);
}
protected static int getLastIndexOfNumber(char[] json, int index)
{
int lastIndex;
for (lastIndex = index; lastIndex < json.Length; lastIndex++)
if ("0123456789+-.eE".IndexOf(json[lastIndex]) == -1)
{
break;
}
return lastIndex - 1;
}
protected static void eatWhitespace(char[] json, ref int index)
{
for (; index < json.Length; index++)
if (" \t\n\r".IndexOf(json[index]) == -1)
{
break;
}
}
protected static int lookAhead(char[] json, int index)
{
int saveIndex = index;
return nextToken(json, ref saveIndex);
}
protected static int nextToken(char[] json, ref int index)
{
eatWhitespace(json, ref index);
if (index == json.Length)
{
return XMiniJSON.TOKEN_NONE;
}
char c = json[index];
index++;
switch (c)
{
case '{':
return XMiniJSON.TOKEN_CURLY_OPEN;
case '}':
return XMiniJSON.TOKEN_CURLY_CLOSE;
case '[':
return XMiniJSON.TOKEN_SQUARED_OPEN;
case ']':
return XMiniJSON.TOKEN_SQUARED_CLOSE;
case ',':
return XMiniJSON.TOKEN_COMMA;
case '"':
return XMiniJSON.TOKEN_STRING;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case '-':
return XMiniJSON.TOKEN_NUMBER;
case ':':
return XMiniJSON.TOKEN_COLON;
}
index--;
int remainingLength = json.Length - index;
// false
if (remainingLength >= 5)
{
if (json[index] == 'f' &&
json[index + 1] == 'a' &&
json[index + 2] == 'l' &&
json[index + 3] == 's' &&
json[index + 4] == 'e')
{
index += 5;
return XMiniJSON.TOKEN_FALSE;
}
}
// true
if (remainingLength >= 4)
{
if (json[index] == 't' &&
json[index + 1] == 'r' &&
json[index + 2] == 'u' &&
json[index + 3] == 'e')
{
index += 4;
return XMiniJSON.TOKEN_TRUE;
}
}
// null
if (remainingLength >= 4)
{
if (json[index] == 'n' &&
json[index + 1] == 'u' &&
json[index + 2] == 'l' &&
json[index + 3] == 'l')
{
index += 4;
return XMiniJSON.TOKEN_NULL;
}
}
return XMiniJSON.TOKEN_NONE;
}
#endregion
#region Serialization
protected static bool serializeObjectOrArray(object objectOrArray, StringBuilder builder)
{
if (objectOrArray is Hashtable)
{
return serializeObject((Hashtable)objectOrArray, builder);
}
else if (objectOrArray is ArrayList)
{
return serializeArray((ArrayList)objectOrArray, builder);
}
else
{
return false;
}
}
protected static bool serializeObject(Hashtable anObject, StringBuilder builder)
{
builder.Append("{");
IDictionaryEnumerator e = anObject.GetEnumerator();
bool first = true;
while (e.MoveNext())
{
string key = e.Key.ToString();
object value = e.Value;
if (!first)
{
builder.Append(", ");
}
serializeString(key, builder);
builder.Append(":");
if (!serializeValue(value, builder))
{
return false;
}
first = false;
}
builder.Append("}");
return true;
}
protected static bool serializeDictionary(Dictionary<string, string> dict, StringBuilder builder)
{
builder.Append("{");
bool first = true;
foreach (var kv in dict)
{
if (!first)
builder.Append(", ");
serializeString(kv.Key, builder);
builder.Append(":");
serializeString(kv.Value, builder);
first = false;
}
builder.Append("}");
return true;
}
protected static bool serializeArray(ArrayList anArray, StringBuilder builder)
{
builder.Append("[");
bool first = true;
for (int i = 0; i < anArray.Count; i++)
{
object value = anArray[i];
if (!first)
{
builder.Append(", ");
}
if (!serializeValue(value, builder))
{
return false;
}
first = false;
}
builder.Append("]");
return true;
}
protected static bool serializeValue(object value, StringBuilder builder)
{
// Type t = value.GetType();
// Debug.Log("type: " + t.ToString() + " isArray: " + t.IsArray);
if (value == null)
{
builder.Append("null");
}
else if (value.GetType().IsArray)
{
serializeArray(new ArrayList((ICollection)value), builder);
}
else if (value is string)
{
serializeString((string)value, builder);
}
else if (value is Char)
{
serializeString(Convert.ToString((char)value), builder);
}
else if (value is Hashtable)
{
serializeObject((Hashtable)value, builder);
}
else if (value is Dictionary<string, string>)
{
serializeDictionary((Dictionary<string, string>)value, builder);
}
else if (value is ArrayList)
{
serializeArray((ArrayList)value, builder);
}
else if ((value is Boolean) && ((Boolean)value == true))
{
builder.Append("true");
}
else if ((value is Boolean) && ((Boolean)value == false))
{
builder.Append("false");
}
else if (value.GetType().IsPrimitive)
{
serializeNumber(Convert.ToDouble(value), builder);
}
else
{
return false;
}
return true;
}
protected static void serializeString(string aString, StringBuilder builder)
{
builder.Append("\"");
char[] charArray = aString.ToCharArray();
for (int i = 0; i < charArray.Length; i++)
{
char c = charArray[i];
if (c == '"')
{
builder.Append("\\\"");
}
else if (c == '\\')
{
builder.Append("\\\\");
}
else if (c == '\b')
{
builder.Append("\\b");
}
else if (c == '\f')
{
builder.Append("\\f");
}
else if (c == '\n')
{
builder.Append("\\n");
}
else if (c == '\r')
{
builder.Append("\\r");
}
else if (c == '\t')
{
builder.Append("\\t");
}
else
{
int codepoint = Convert.ToInt32(c);
if ((codepoint >= 32) && (codepoint <= 126))
{
builder.Append(c);
}
else
{
builder.Append("\\u" + Convert.ToString(codepoint, 16).PadLeft(4, '0'));
}
}
}
builder.Append("\"");
}
protected static void serializeNumber(double number, StringBuilder builder)
{
builder.Append(Convert.ToString(number)); // , CultureInfo.InvariantCulture));
}
#endregion
}
#region Extension methods
public static class XMiniJSONExtensions
{
/*public static string toJson(this Hashtable obj)
{
return XMiniJSON.jsonEncode(obj);
}
public static string toJson(this Dictionary<string, string> obj)
{
return XMiniJSON.jsonEncode(obj);
}
public static ArrayList arrayListFromJson(this string json)
{
return XMiniJSON.jsonDecode(json) as ArrayList;
}
public static Hashtable hashtableFromJson(this string json)
{
return XMiniJSON.jsonDecode(json) as Hashtable;
}*/
}
#endregion
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