360 lines
11 KiB
C#
360 lines
11 KiB
C#
using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Reflection;
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using System.Text;
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namespace VAR.Json
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{
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public class JsonWriter
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{
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#region Declarations
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private bool _indent = false;
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private bool _useTabForIndent = false;
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private int _indentChars = 4;
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private int _indentThresold = 3;
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#endregion Declarations
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#region Creator
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public JsonWriter()
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{
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}
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public JsonWriter(int indentChars)
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{
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_indent = true;
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_indentChars = indentChars;
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_useTabForIndent = false;
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}
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public JsonWriter(bool useTabForIndent)
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{
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_indent = true;
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_useTabForIndent = useTabForIndent;
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}
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#endregion Creator
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#region Private methods
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private bool IsValue(object obj)
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{
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if (obj == null)
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{
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return true;
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}
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if (
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(obj is float) ||
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(obj is double) ||
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(obj is short) ||
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(obj is int) ||
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(obj is long) ||
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(obj is string) ||
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(obj is bool) ||
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false)
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{
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return true;
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}
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return false;
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}
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private void WriteIndent(StringBuilder sbOutput, int level)
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{
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if (!_indent)
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{
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return;
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}
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sbOutput.Append('\n');
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if (_useTabForIndent)
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{
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for (int i = 0; i < level; i++) { sbOutput.Append('\t'); }
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}
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else
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{
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int n = level * _indentChars;
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for (int i = 0; i < n; i++) { sbOutput.Append(' '); }
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}
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}
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private void WriteString(StringBuilder sbOutput, string str)
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{
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sbOutput.Append('"');
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char c;
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int n = str.Length;
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for (int i = 0; i < n; i++)
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{
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c = str[i];
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if (c == '"') { sbOutput.Append("\\\""); }
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else if (c == '\\') { sbOutput.Append("\\\\"); }
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else if (c == '/') { sbOutput.Append("\\/"); }
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else if (c == '\b') { sbOutput.Append("\\b"); }
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else if (c == '\f') { sbOutput.Append("\\f"); }
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else if (c == '\n') { sbOutput.Append("\\n"); }
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else if (c == '\r') { sbOutput.Append("\\r"); }
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else if (c == '\t') { sbOutput.Append("\\t"); }
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else if (c < 32 || c >= 127) { sbOutput.AppendFormat("\\u{0:X04}", (int)c); }
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else { sbOutput.Append(c); }
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}
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sbOutput.Append('"');
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}
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private void WriteValue(StringBuilder sbOutput, object obj, List<object> parentLevels, bool useReflection)
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{
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if (obj == null || obj is DBNull)
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{
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// NULL
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sbOutput.Append("null");
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}
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else if (
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(obj is float) ||
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(obj is double) ||
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(obj is short) ||
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(obj is int) ||
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(obj is long) ||
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false)
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{
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// Numbers
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sbOutput.Append(obj.ToString());
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}
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else if (obj is string)
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{
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// Strings
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WriteString(sbOutput, (string)obj);
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}
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else if (obj is bool)
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{
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// Booleans
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sbOutput.Append(((bool)obj) ? "true" : "false");
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}
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else if (obj is DateTime)
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{
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// DateTime
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sbOutput.Append('"');
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sbOutput.Append(((DateTime)obj).ToString("yyyy-MM-ddTHH:mm:ssZ"));
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sbOutput.Append('"');
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}
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else if (obj is IDictionary)
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{
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// Objects
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WriteObject(sbOutput, obj, parentLevels);
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}
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else if (obj is IEnumerable)
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{
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// Array/List
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WriteList(sbOutput, obj, parentLevels);
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}
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else
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{
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if (useReflection)
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{
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// Reflected object
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WriteReflectedObject(sbOutput, obj, parentLevels);
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}
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else
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{
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WriteString(sbOutput, Convert.ToString(obj));
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}
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}
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}
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private void WriteList(StringBuilder sbOutput, object obj, List<object> parentLevels)
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{
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IEnumerable list = (IEnumerable)obj;
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int n = 0;
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// Check if it is a leaf object
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bool isLeaf = true;
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foreach (object childObj in list)
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{
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if (!IsValue(childObj))
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{
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isLeaf = false;
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}
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n++;
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}
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// Empty
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if (n == 0)
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{
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sbOutput.Append("[ ]");
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return;
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}
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// Write array
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bool first = true;
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sbOutput.Append("[ ");
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if (!isLeaf || n > _indentThresold)
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{
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WriteIndent(sbOutput, parentLevels.Count + 1);
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}
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foreach (object childObj in list)
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{
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if (!first)
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{
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sbOutput.Append(", ");
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if (!isLeaf || n > _indentThresold)
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{
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WriteIndent(sbOutput, parentLevels.Count + 1);
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}
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}
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first = false;
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parentLevels.Add(obj);
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WriteValue(sbOutput, childObj, parentLevels, true);
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parentLevels.Remove(obj);
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}
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if (!isLeaf || n > _indentThresold)
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{
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WriteIndent(sbOutput, parentLevels.Count);
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}
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sbOutput.Append(" ]");
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}
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private void WriteObject(StringBuilder sbOutput, object obj, List<object> parentLevels)
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{
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IDictionary map = (IDictionary)obj;
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int n = map.Count;
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// Empty
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if (map.Count == 0)
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{
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sbOutput.Append("{ }");
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return;
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}
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// Check if it is a leaf object
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bool isLeaf = true;
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foreach (object value in map.Values)
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{
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if (!IsValue(value))
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{
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isLeaf = false;
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break;
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}
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}
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// Write object
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bool first = true;
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sbOutput.Append("{ ");
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if (!isLeaf || n > _indentThresold)
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{
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WriteIndent(sbOutput, parentLevels.Count + 1);
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}
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foreach (object key in map.Keys)
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{
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object value = map[key];
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if (!first)
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{
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sbOutput.Append(", ");
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if (!isLeaf || n > _indentThresold)
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{
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WriteIndent(sbOutput, parentLevels.Count + 1);
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}
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}
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first = false;
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WriteString(sbOutput, Convert.ToString(key));
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sbOutput.Append(": ");
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parentLevels.Add(obj);
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WriteValue(sbOutput, value, parentLevels, true);
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parentLevels.Remove(obj);
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}
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if (!isLeaf || n > _indentThresold)
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{
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WriteIndent(sbOutput, parentLevels.Count);
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}
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sbOutput.Append(" }");
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}
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private void WriteReflectedObject(StringBuilder sbOutput, object obj, List<object> parentLevels)
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{
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Type type = obj.GetType();
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PropertyInfo[] rawProperties = type.GetProperties(BindingFlags.Public | BindingFlags.Instance);
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List<PropertyInfo> properties = new List<PropertyInfo>();
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foreach (PropertyInfo property in rawProperties)
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{
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if (property.CanRead == false) { continue; }
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properties.Add(property);
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}
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int n = properties.Count;
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// Empty
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if (n == 0)
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{
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sbOutput.Append("{ }");
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return;
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}
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// Check if it is a leaf object
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bool isLeaf = true;
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foreach (PropertyInfo property in properties)
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{
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object value = property.GetValue(obj, null);
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if (!IsValue(value))
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{
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isLeaf = false;
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break;
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}
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}
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// Write object
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bool first = true;
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sbOutput.Append("{ ");
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if (!isLeaf || n > _indentThresold)
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{
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WriteIndent(sbOutput, parentLevels.Count + 1);
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}
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foreach (PropertyInfo property in properties)
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{
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object value = null;
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MethodInfo getMethod = property.GetGetMethod();
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ParameterInfo[] parameters = getMethod.GetParameters();
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if (parameters.Length == 0)
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{
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value = property.GetValue(obj, null);
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}
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if (!first)
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{
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sbOutput.Append(", ");
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if (!isLeaf || n > _indentThresold)
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{
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WriteIndent(sbOutput, parentLevels.Count + 1);
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}
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}
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first = false;
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WriteString(sbOutput, property.Name);
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sbOutput.Append(": ");
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parentLevels.Add(obj);
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if (value != obj && parentLevels.Contains(value) == false)
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{
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WriteValue(sbOutput, value, parentLevels, false);
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}
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else
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{
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WriteValue(sbOutput, null, parentLevels, false);
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}
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parentLevels.Remove(obj);
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}
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if (!isLeaf || n > _indentThresold)
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{
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WriteIndent(sbOutput, parentLevels.Count);
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}
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sbOutput.Append(" }");
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}
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#endregion Private methods
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#region Public methods
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public string Write(object obj)
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{
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StringBuilder sbOutput = new StringBuilder();
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WriteValue(sbOutput, obj, new List<object>(), true);
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return sbOutput.ToString();
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}
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#endregion Public methods
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}
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} |