VAR/VAR.Json
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Avoid infinite recursive loop with looped or self referencing object structures.

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This commit is contained in:
Valeriano A.R.
2017-11-15 16:07:21 +01:00
parent 096267cebc
commit 5bf8b85416
1 changed files with 64 additions and 41 deletions
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105
VAR.Json/JsonWriter.cs
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@@ -25,30 +25,36 @@ namespace VAR.Json
public JsonWriter(int indentChars)
{
this._indent = true;
this._indentChars = indentChars;
this._useTabForIndent = false;
_indent = true;
_indentChars = indentChars;
_useTabForIndent = false;
}
public JsonWriter(bool useTabForIndent)
{
this._indent = true;
this._useTabForIndent = useTabForIndent;
_indent = true;
_useTabForIndent = useTabForIndent;
}
#endregion Creator
#region Private methods
private bool IsValue(Object obj)
private bool IsValue(object obj)
{
if (obj == null)
{
return true;
}
if ((obj is float) || (obj is double) ||
(obj is System.Int16) || (obj is System.Int32) || (obj is System.Int64)
|| (obj is String) || (obj is Boolean))
if (
(obj is float) ||
(obj is double) ||
(obj is short) ||
(obj is int) ||
(obj is long) ||
(obj is string) ||
(obj is bool) ||
false)
{
return true;
}
@@ -72,7 +78,7 @@ namespace VAR.Json
for (int i = 0; i < n; i++) { sbOutput.Append(' '); }
}
}
private void WriteString(StringBuilder sbOutput, string str)
{
sbOutput.Append('"');
@@ -95,28 +101,33 @@ namespace VAR.Json
sbOutput.Append('"');
}
private void WriteValue(StringBuilder sbOutput, Object obj, int level, bool useReflection)
private void WriteValue(StringBuilder sbOutput, object obj, List<object> parentLevels, bool useReflection)
{
if (obj == null || obj is DBNull)
{
// NULL
sbOutput.Append("null");
}
else if ((obj is float) || (obj is double) ||
(obj is System.Int16) || (obj is System.Int32) || (obj is System.Int64))
else if (
(obj is float) ||
(obj is double) ||
(obj is short) ||
(obj is int) ||
(obj is long) ||
false)
{
// Numbers
sbOutput.Append(obj.ToString());
}
else if (obj is String)
else if (obj is string)
{
// Strings
WriteString(sbOutput, (String)obj);
WriteString(sbOutput, (string)obj);
}
else if (obj is Boolean)
else if (obj is bool)
{
// Booleans
sbOutput.Append(((Boolean)obj) ? "true" : "false");
sbOutput.Append(((bool)obj) ? "true" : "false");
}
else if (obj is DateTime)
{
@@ -128,19 +139,19 @@ namespace VAR.Json
else if (obj is IDictionary)
{
// Objects
WriteObject(sbOutput, obj, level);
WriteObject(sbOutput, obj, parentLevels);
}
else if (obj is IEnumerable)
{
// Array/List
WriteList(sbOutput, obj, level);
WriteList(sbOutput, obj, parentLevels);
}
else
{
if (useReflection)
{
// Reflected object
WriteReflectedObject(sbOutput, obj, level);
WriteReflectedObject(sbOutput, obj, parentLevels);
}
else
{
@@ -149,7 +160,7 @@ namespace VAR.Json
}
}
private void WriteList(StringBuilder sbOutput, Object obj, int level)
private void WriteList(StringBuilder sbOutput, object obj, List<object> parentLevels)
{
IEnumerable list = (IEnumerable)obj;
int n = 0;
@@ -177,7 +188,7 @@ namespace VAR.Json
sbOutput.Append("[ ");
if (!isLeaf || n > _indentThresold)
{
WriteIndent(sbOutput, level + 1);
WriteIndent(sbOutput, parentLevels.Count + 1);
}
foreach (object childObj in list)
{
@@ -186,20 +197,22 @@ namespace VAR.Json
sbOutput.Append(", ");
if (!isLeaf || n > _indentThresold)
{
WriteIndent(sbOutput, level + 1);
WriteIndent(sbOutput, parentLevels.Count + 1);
}
}
first = false;
WriteValue(sbOutput, childObj, level + 1, true);
parentLevels.Add(obj);
WriteValue(sbOutput, childObj, parentLevels, true);
parentLevels.Remove(obj);
}
if (!isLeaf || n > _indentThresold)
{
WriteIndent(sbOutput, level);
WriteIndent(sbOutput, parentLevels.Count);
}
sbOutput.Append(" ]");
}
private void WriteObject(StringBuilder sbOutput, Object obj, int level)
private void WriteObject(StringBuilder sbOutput, object obj, List<object> parentLevels)
{
IDictionary map = (IDictionary)obj;
int n = map.Count;
@@ -227,7 +240,7 @@ namespace VAR.Json
sbOutput.Append("{ ");
if (!isLeaf || n > _indentThresold)
{
WriteIndent(sbOutput, level + 1);
WriteIndent(sbOutput, parentLevels.Count + 1);
}
foreach (object key in map.Keys)
{
@@ -237,32 +250,33 @@ namespace VAR.Json
sbOutput.Append(", ");
if (!isLeaf || n > _indentThresold)
{
WriteIndent(sbOutput, level + 1);
WriteIndent(sbOutput, parentLevels.Count + 1);
}
}
first = false;
WriteString(sbOutput, Convert.ToString(key));
sbOutput.Append(": ");
WriteValue(sbOutput, value, level + 1, true);
parentLevels.Add(obj);
WriteValue(sbOutput, value, parentLevels, true);
parentLevels.Remove(obj);
}
if (!isLeaf || n > _indentThresold)
{
WriteIndent(sbOutput, level);
WriteIndent(sbOutput, parentLevels.Count);
}
sbOutput.Append(" }");
}
private void WriteReflectedObject(StringBuilder sbOutput, Object obj, int level)
private void WriteReflectedObject(StringBuilder sbOutput, object obj, List<object> parentLevels)
{
Type type = obj.GetType();
PropertyInfo[] rawProperties = type.GetProperties(BindingFlags.Public | BindingFlags.Instance);
List<PropertyInfo> properties = new List<PropertyInfo>();
foreach (PropertyInfo property in rawProperties)
{
if (property.CanRead)
{
properties.Add(property);
}
if (property.CanRead == false) { continue; }
properties.Add(property);
}
int n = properties.Count;
@@ -290,7 +304,7 @@ namespace VAR.Json
sbOutput.Append("{ ");
if (!isLeaf || n > _indentThresold)
{
WriteIndent(sbOutput, level + 1);
WriteIndent(sbOutput, parentLevels.Count + 1);
}
foreach (PropertyInfo property in properties)
{
@@ -306,17 +320,26 @@ namespace VAR.Json
sbOutput.Append(", ");
if (!isLeaf || n > _indentThresold)
{
WriteIndent(sbOutput, level + 1);
WriteIndent(sbOutput, parentLevels.Count + 1);
}
}
first = false;
WriteString(sbOutput, property.Name);
sbOutput.Append(": ");
WriteValue(sbOutput, value, level + 1, false);
parentLevels.Add(obj);
if (value != obj && parentLevels.Contains(value) == false)
{
WriteValue(sbOutput, value, parentLevels, false);
}
else
{
WriteValue(sbOutput, null, parentLevels, false);
}
parentLevels.Remove(obj);
}
if (!isLeaf || n > _indentThresold)
{
WriteIndent(sbOutput, level);
WriteIndent(sbOutput, parentLevels.Count);
}
sbOutput.Append(" }");
}
@@ -325,10 +348,10 @@ namespace VAR.Json
#region Public methods
public String Write(Object obj)
public string Write(object obj)
{
StringBuilder sbOutput = new StringBuilder();
WriteValue(sbOutput, obj, 0, true);
WriteValue(sbOutput, obj, new List<object>(), true);
return sbOutput.ToString();
}