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) _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('\"'); } } }
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