private static bool FilterElement(StringBuilder sb, object obj, object key, object val,
bool pretty, bool includeType, bool showNulls, bool isArray, int depth, List <object> recursionStack,
KeyValuePairToStringFilter filter = null)
{
bool unfiltered = true;
if (filter != null)
{
string result = filter.Invoke(obj, key, val);
unfiltered = result == null;
if (!unfiltered && result.Length != 0)
{
sb.Append(result); return(true);
}
}
if (unfiltered)
{
if (!isArray)
{
sb.Append(key).Append(pretty ? " : " : ":");
}
sb.Append(Stringify(val, pretty, includeType, showNulls, true, depth + 1, recursionStack));
return(true);
}
return(false);
}
/// <summary>
/// stringifies an object using custom NonStandard rules
/// </summary>
/// <param name="obj"></param>
/// <param name="pretty"></param>
/// <param name="showType">include "=TypeName" if there could be ambiguity because of inheritance</param>
/// <param name="depth"></param>
/// <param name="rStack">used to prevent recursion stack overflows</param>
/// <param name="filter">object0 is the object, object1 is the member, object2 is the value. if it returns null, print as usual. if returns "", skip print.</param>
/// <param name="howToMarkStrongType">if null, use <see cref="StringifyTypeOfDictionary"/>, which is expected by <see cref="NonStandard.Data.CodeConvert.TryParse"/></param>
/// <returns></returns>
public static string Stringify(this object obj, bool pretty = true, bool showType = true, bool showNulls = false, bool showBoundary = true, int depth = 0, List <object> rStack = null, KeyValuePairToStringFilter filter = null, Func <Type, string> howToMarkStrongType = null)
{
if (obj == null)
{
return(showNulls ? "null" : "");
}
if (filter != null)
{
string res = filter.Invoke(obj, null, null); if (res != null)
{
return(res);
}
}
Type t = obj.GetType();
MethodInfo stringifyMethod = t.GetMethod("Stringify", Type.EmptyTypes);
if (stringifyMethod != null)
{
return(stringifyMethod.Invoke(obj, Array.Empty <object>()) as string);
}
StringBuilder sb = new StringBuilder();
bool showTypeHere = showType; // no need to print type if there isn't type ambiguity
if (showType)
{
Type b = t.BaseType; // if the parent class is a base class, there isn't any ambiguity
if (b == typeof(ValueType) || b == typeof(System.Object) || b == typeof(Array) ||
t.GetCustomAttributes(false).FindIndex(o => o.GetType() == typeof(StringifyHideTypeAttribute)) >= 0)
{
showTypeHere = false;
}
}
if (obj is string || t.IsPrimitive || t.IsEnum)
{
return(StringifiedSimple(sb, obj, showBoundary).ToString());
}
if (rStack == null)
{
rStack = new List <object>();
}
int recursionIndex = rStack.IndexOf(obj);
if (recursionIndex >= 0)
{
return(sb.Append("/* recursed " + (rStack.Count - recursionIndex) + " */").ToString());
}
rStack.Add(obj);
Type listT = t.GetIListType();
if (t.IsArray || listT != null)
{
StringifiedList(sb, obj, listT, depth, howToMarkStrongType, filter, rStack, pretty, showBoundary, showType, showTypeHere, showNulls);
}
else
{
StringifiedObject(sb, t, obj, depth, howToMarkStrongType, filter, rStack, pretty, showBoundary, showType, showTypeHere, showNulls);
}
if (sb.Length == 0)
{
sb.Append(obj.ToString());
}
return(sb.ToString());
}
private static void AppendStringifiedObjectReflection(StringBuilder sb, Type t, object obj, int depth, Func <Type, string> howToMarkStrongType, KeyValuePairToStringFilter filter, List <object> rStack,
bool pretty, bool showType, bool showTypeHere, bool showNulls)
{
FieldInfo[] fi = t.GetFields();
for (int i = 0; i < fi.Length; ++i)
{
object val = fi[i].GetValue(obj);
if (!showNulls && val == null)
{
continue;
}
if (i > 0 || showTypeHere)
{
sb.Append(",");
}
if (pretty)
{
sb.Append("\n" + StringExtension.Indentation(depth + 1));
}
if (filter == null)
{
sb.Append(fi[i].Name).Append(pretty ? " : " : ":");
sb.Append(Stringify(val, pretty, showType, showNulls, true, depth + 1, rStack));
}
else
{
FilterElement(sb, obj, fi[i].Name, val,
pretty, showType, showNulls, false, depth, rStack, filter);
}
}
}
private static void AppendStringifiedDictionary(StringBuilder sb, Type t, object obj, int depth, KeyValuePairToStringFilter filter, List <object> rStack, bool pretty, bool showType, bool showTypeHere, bool showNulls)
{
MethodInfo getEnum = t.GetMethod("GetEnumerator", new Type[] { });
MethodInfo getKey = null, getVal = null;
object[] noparams = Array.Empty <object>();
IEnumerator e = getEnum.Invoke(obj, noparams) as IEnumerator;
bool printed = false;
while (e.MoveNext())
{
object o = e.Current;
if (getKey == null)
{
getKey = o.GetType().GetProperty("Key").GetGetMethod();
}
if (getVal == null)
{
getVal = o.GetType().GetProperty("Value").GetGetMethod();
}
if (printed || showTypeHere)
{
sb.Append(",");
}
if (pretty)
{
sb.Append("\n" + StringExtension.Indentation(depth + 1));
}
object k = getKey.Invoke(o, noparams);
object v = getVal.Invoke(o, noparams);
if (!showNulls && v == null)
{
continue;
}
if (filter == null)
{
string keyToString = k.ToString();
if (k is string && (keyToString.ContainsNonAlphaCharacters() || CodeRules.Default.GetDelimiter(keyToString) != null))
{
keyToString = keyToString.StringifySmall();
}
sb.Append(keyToString).Append(pretty ? " : " : ":");
sb.Append(Stringify(v, pretty, showType, showNulls, showBoundary: true, depth + 1, rStack));
printed = true;
}
else
{
printed = FilterElement(sb, obj, k, v, pretty, showType, showNulls, false, depth, rStack, filter);
}
}
}
private static void StringifiedObject(StringBuilder sb, Type t, object obj, int depth, Func <Type, string> howToMarkStrongType, KeyValuePairToStringFilter filter, List <object> rStack, bool pretty, bool showBoundary, bool showType, bool showTypeHere, bool showNulls)
{
KeyValuePair <Type, Type> kvp = t.GetIDictionaryType();
bool isDict = kvp.Key != null;
if (showBoundary)
{
sb.Append("{");
}
if (showTypeHere)
{
AppendType(sb, obj, depth, howToMarkStrongType, pretty);
}
if (!isDict)
{
AppendStringifiedObjectReflection(sb, t, obj, depth, howToMarkStrongType, filter, rStack, pretty, showType, showTypeHere, showNulls);
}
else
{
AppendStringifiedDictionary(sb, t, obj, depth, filter, rStack, pretty, showType, showTypeHere, showNulls);
}
if (pretty)
{
sb.Append("\n" + StringExtension.Indentation(depth));
}
if (showBoundary)
{
sb.Append("}");
}
}
private static void StringifiedList(StringBuilder sb, object obj, Type iListElement, int depth, Func <Type, string> howToMarkStrongType, KeyValuePairToStringFilter filter, List <object> rStack,
bool pretty, bool showBoundary, bool showType, bool showTypeHere, bool showNulls)
{
if (showBoundary)
{
sb.Append("[");
}
if (showTypeHere)
{
AppendType(sb, obj, depth, howToMarkStrongType, pretty);
}
IList list = obj as IList;
for (int i = 0; i < list.Count; ++i)
{
if (!showNulls && list[i] == null)
{
continue;
}
if (i > 0)
{
sb.Append(",");
}
if (pretty && !iListElement.IsPrimitive)
{
sb.Append("\n" + StringExtension.Indentation(depth + 1));
}
if (filter == null)
{
sb.Append(Stringify(list[i], pretty, showType, showNulls, true, depth + 1, rStack));
}
else
{
FilterElement(sb, obj, i, list[i], pretty, showType, showNulls, true, depth, rStack, filter);
}
}
if (pretty)
{
sb.Append("\n" + StringExtension.Indentation(depth));
}
if (showBoundary)
{
sb.Append("]");
}
}