using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Globalization;
using System.IO;
using System.Reflection;
using System.Text;
namespace fastJSON
{
internal class JSONSerializer
{
private readonly StringBuilder _output = new StringBuilder();
public static string ToJSON(object obj)
{
return new JSONSerializer().ConvertToJSON(obj);
}
internal string ConvertToJSON(object obj)
{
WriteValue(obj);
return _output.ToString();
}
private void WriteValue(object obj)
{
if (obj == null || obj is System.DBNull)
_output.Append("null");
else if (obj is sbyte ||
obj is byte ||
obj is short ||
obj is ushort ||
obj is int ||
obj is uint ||
obj is long ||
obj is ulong ||
obj is decimal ||
obj is double ||
obj is float)
_output.Append(Convert.ToString(obj,NumberFormatInfo.InvariantInfo));
else if (obj is bool)
_output.Append(obj.ToString().ToLower()); // conform to standard
else if (obj is char || obj is Enum || obj is Guid || obj is string)
WriteString(obj.ToString());
else if (obj is DateTime)
{
_output.Append("\"");
_output.Append(((DateTime)obj).ToString("yyyy-MM-dd HH:mm:ss"));// conform to standard
_output.Append("\"");
}
else if(obj is DataSet)
WriteDataset((DataSet)obj);
else if( obj is byte[])
WriteByteArray((byte[]) obj);
else if (obj is IDictionary)
WriteDictionary((IDictionary)obj);
else if (obj is Array || obj is IList || obj is ICollection)
WriteArray((IEnumerable)obj);
else
WriteObject(obj);
}
private void WriteByteArray(byte[] bytes)
{
WriteString(Convert.ToBase64String(bytes));
}
private void WriteDataset(DataSet ds)
{
_output.Append("{");
WritePair("$schema", ds.GetXmlSchema());
_output.Append(",");
foreach (DataTable table in ds.Tables)
{
_output.Append("\"");
_output.Append(table.TableName);
_output.Append("\":[");
foreach (DataRow row in table.Rows)
{
_output.Append("{");
foreach (DataColumn column in row.Table.Columns)
{
WritePair(column.ColumnName, row[column]);
}
_output.Append("}");
}
_output.Append("]");
}
// end dataset
_output.Append("}");
}
private void WriteObject(object obj)
{
_output.Append("{");
Type t = obj.GetType();
WritePair("$type", t.AssemblyQualifiedName);
_output.Append(",");
List<Getters> g = JSON.Instance.GetGetters(t);
foreach (Getters p in g)
{
WritePair(p.Name,p.Getter(obj));
}
_output.Append("}");
}
private void WritePair(string name, string value)
{
WriteString(name);
_output.Append(":");
WriteString(value);
}
private void WritePair(string name, object value)
{
WriteString(name);
_output.Append(":");
WriteValue(value);
}
private void WriteArray(IEnumerable array)
{
_output.Append("[");
bool pendingSeperator = false;
foreach (object obj in array)
{
if (pendingSeperator)
_output.Append(',');
WriteValue(obj);
pendingSeperator = true;
}
_output.Append("]");
}
private void WriteDictionary(IDictionary dic)
{
_output.Append("[");
bool pendingSeparator = false;
foreach (DictionaryEntry entry in dic)
{
if (pendingSeparator)
_output.Append(",");
_output.Append("{");
WritePair("k",entry.Key);
_output.Append(",");
WritePair("v",entry.Value);
_output.Append("}");
pendingSeparator = true;
}
_output.Append("]");
}
private void WriteString(string s)
{
_output.Append('\"');
foreach (char c in s)
{
switch (c)
{
case '\t': _output.Append("\\t"); break;
case '\r': _output.Append("\\r"); break;
case '\n': _output.Append("\\n"); break;
case '"' :
case '\\': _output.Append("\\"); _output.Append(c); break;
default:
{
if (c >= ' ' && c < 128)
_output.Append(c);
else
{
_output.Append("\\u");
_output.Append(((int)c).ToString("X4"));
}
}
break;
}
}
_output.Append('\"');
}
}
}