/// <summary>
/// Returns the <see cref="JsonPlusObjectMember"/> associated with the <see cref="JsonPlusPath"/> specified.
/// </summary>
/// <param name="path">The path to the member to return.</param>
/// <param name="result">If the member is returned successfully, this parameter will contain the result <see cref="JsonPlusObjectMember"/>. This parameter should be passed uninitialized.</param>
/// <returns>`true` if the <see cref="JsonPlusObject"/> contains the <see cref="JsonPlusObjectMember"/> associated with <paramref name="path"/>. Otherwise, `false`.</returns>
public bool TryGetMember(JsonPlusPath path, out JsonPlusObjectMember result)
{
result = null;
if (path == null || path.Count == 0)
{
return(false);
}
int pathIndex = 0;
JsonPlusObject currentObject = this;
while (true)
{
string key = path[pathIndex];
if (!currentObject.TryGetValue(key, out var field))
{
return(false);
}
if (pathIndex >= path.Count - 1)
{
result = field;
return(true);
}
if (field.Type != JsonPlusType.Object)
{
return(false);
}
currentObject = field.GetObject();
pathIndex = pathIndex + 1;
}
}
private JsonPlusValue ResolveSubstitution(JsonPlusSubstitution sub)
{
JsonPlusObjectMember subField = sub.ParentMember;
// first case, this substitution is a direct self-reference
if (sub.Path == sub.GetMemberPath())
{
IJsonPlusNode parent = sub.Parent;
while (parent is JsonPlusValue)
{
parent = parent.Parent;
}
// Fail case
if (parent is JsonPlusArray)
{
throw new JsonPlusException(RS.SelfRefSubstitutionInArray);
}
// try to resolve substitution by looking backward in the field assignment stack
return(subField.OlderValueThan(sub));
}
// need to recursively get full path
JsonPlusPath fieldPath = subField.GetMemberPath();
// second case, the substitution references a field child in the past
if (sub.Path.IsChildPathOf(fieldPath))
{
JsonPlusValue olderValue = subField.OlderValueThan(sub);
if ((olderValue != null) &&
(olderValue.Type == JsonPlusType.Object))
{
int difLength = sub.Path.Count - fieldPath.Count;
JsonPlusPath deltaPath = sub.Path.SubPath(sub.Path.Count - difLength, difLength);
JsonPlusObject olderObject = olderValue.GetObject();
if (olderObject.TryGetValue(deltaPath, out JsonPlusValue innerValue))
{
return(innerValue.Type == JsonPlusType.Object ? innerValue : null);
}
}
}
// Detect invalid parent-referencing substitution
if (fieldPath.IsChildPathOf(sub.Path))
{
throw new JsonPlusException(RS.SubstitutionRefDirectParentError);
}
// Detect invalid cyclic reference loop
if (IsValueCyclic(subField, sub))
{
throw new JsonPlusException(RS.CyclicSubstitutionLoop);
}
// third case, regular substitution
_root.GetObject().TryGetValue(sub.Path, out JsonPlusValue field);
return(field);
}
private static void Flatten(IJsonPlusNode node)
{
if (!(node is JsonPlusValue v))
{
return;
}
switch (v.Type)
{
case JsonPlusType.Object:
JsonPlusObject o = v.GetObject();
v.Clear();
v.Add(o);
foreach (JsonPlusObjectMember item in o.Values)
{
Flatten(item);
}
break;
case JsonPlusType.Array:
List <IJsonPlusNode> a = v.GetArray();
v.Clear();
JsonPlusArray newArray = new JsonPlusArray(v);
foreach (IJsonPlusNode item in a)
{
Flatten(item);
newArray.Add(item);
}
v.Add(newArray);
break;
case JsonPlusType.Literal:
if (v.Count == 1)
{
return;
}
string value = v.GetString();
v.Clear();
if (value == null)
{
v.Add(new NullValue(v));
}
else if (value.NeedTripleQuotes())
{
v.Add(new TripleQuotedStringValue(v, value));
}
else if (value.NeedQuotes())
{
v.Add(new QuotedStringValue(v, value));
}
else
{
v.Add(new UnquotedStringValue(v, value));
}
break;
}
}
/// <see cref="IJsonPlusNode.Clone(IJsonPlusNode)"/>
public IJsonPlusNode Clone(IJsonPlusNode newParent)
{
JsonPlusObject clone = new JsonPlusObject(newParent);
foreach (KeyValuePair <string, JsonPlusObjectMember> kvp in this)
{
clone[kvp.Key] = (JsonPlusObjectMember)kvp.Value.Clone(clone);
}
return(clone);
}
/// <summary>
/// Initializes a new instance of the <see cref="JsonPlusObjectMember"/> class.
/// </summary>
/// <param name="path">The path to this member in the data tree.</param>
/// <param name="parent">The parent container of this object instance.</param>
public JsonPlusObjectMember(JsonPlusPath path, JsonPlusObject parent)
{
if (path == null)
{
throw new ArgumentNullException(nameof(path));
}
Path = new JsonPlusPath(path);
Parent = parent;
_internalValues = new List <JsonPlusValue>();
}
/// <summary>
/// Returns the merged <see cref="JsonPlusObject"/> that backs the <see cref="JsonPlusObjectMember"/> associated with the key specified.
/// </summary>
/// <param name="key">The key associated with the member to return.</param>
/// <param name="result">If the member is returned successfully, this parameter will contain the result <see cref="JsonPlusObjectMember"/>. This parameter should be passed uninitialized.</param>
/// <returns>`true` if the <see cref="JsonPlusObject"/> contains the <see cref="JsonPlusObjectMember"/> associated with <paramref name="key"/>, and the <see cref="JsonPlusObjectMember.Type"/> property
/// is <see cref="JsonPlusType.Object"/>. Otherwise, `false`.</returns>
public bool TryGetObject(string key, out JsonPlusObject result)
{
result = null;
if (!TryGetMember(key, out JsonPlusObjectMember field))
{
return(false);
}
result = field.GetObject();
return(true);
}
internal void EnsureMemberIsObject()
{
if (Type == JsonPlusType.Object)
{
return;
}
JsonPlusValue v = new JsonPlusValue(this);
JsonPlusObject o = new JsonPlusObject(v);
v.Add(o);
_internalValues.Add(v);
}
internal JsonPlusValue OlderValueThan(IJsonPlusNode marker)
{
List <JsonPlusObject> objectList = new List <JsonPlusObject>();
int index = 0;
while (index < _internalValues.Count)
{
JsonPlusValue value = _internalValues[index];
if (value.Any(v => ReferenceEquals(v, marker)))
{
break;
}
switch (value.Type)
{
case JsonPlusType.Object:
objectList.Add(value.GetObject());
break;
case JsonPlusType.Literal:
case JsonPlusType.Array:
objectList.Clear();
break;
}
index++;
}
if (objectList.Count == 0)
{
return(index == 0
? null
: _internalValues[index - 1]);
}
JsonPlusValue result = new JsonPlusValue(null);
JsonPlusObject o = new JsonPlusObject(result);
result.Add(o);
foreach (JsonPlusObject obj in objectList)
{
o.Merge(obj);
}
return(result);
}
private JsonPlusObjectMember ParseObjectMember(JsonPlusObject owner)
{
// sanity check
if (_tokens.Current.Type != TokenType.LiteralValue)
{
throw JsonPlusParserException.Create(_tokens.Current, Path, string.Format(RS.UnexpectedTokenInMember, TokenType.LiteralValue, _tokens.Current.Type));
}
JsonPlusPath pathDelta = ParseKey();
if (_tokens.Current.IsNonSignificant())
{
ConsumeWhitelines();
}
// sanity check
if (_tokens.Current.Type != TokenType.Assignment &&
_tokens.Current.Type != TokenType.StartOfObject &&
_tokens.Current.Type != TokenType.SelfAssignment)
{
throw JsonPlusParserException.Create(_tokens.Current, Path,
string.Format(RS.UnexpectedTokenWith3AltInMember,
TokenType.Assignment, TokenType.StartOfObject, TokenType.SelfAssignment,
_tokens.Current.Type));
}
// sanity check
if (pathDelta == null || pathDelta.Count == 0)
{
throw JsonPlusParserException.Create(_tokens.Current, Path, RS.ObjectMemberPathUnspecified);
}
List <JsonPlusObjectMember> childInPath = owner.TraversePath(pathDelta);
Path.AddRange(pathDelta);
JsonPlusObjectMember currentField = childInPath[childInPath.Count - 1];
JsonPlusValue parsedValue = ParseValue(currentField);
foreach (JsonPlusSubstitution removedSub in currentField.SetValue(parsedValue))
{
_substitutions.Remove(removedSub);
}
Path.RemoveRange(Path.Count - pathDelta.Count, pathDelta.Count);
return(childInPath[0]);
}
/// <summary>
/// Merge the members of a <see cref="JsonPlusObject"/> into this instance.
/// </summary>
/// <param name="other">The <see cref="JsonPlusObject"/> to merge with this instance.</param>
public virtual void Merge(JsonPlusObject other)
{
string[] keys = other.Keys.ToArray();
foreach (string key in keys)
{
if (ContainsKey(key))
{
JsonPlusObjectMember thisItem = this[key];
JsonPlusObjectMember otherItem = other[key];
if (thisItem.Type == JsonPlusType.Object &&
otherItem.Type == JsonPlusType.Object)
{
thisItem.GetObject().Merge(otherItem.GetObject());
continue;
}
}
this[key] = other[key];
}
}
/// <summary>
/// Returns the <see cref="JsonPlusObjectMember"/> associated with the <see cref="JsonPlusPath"/> specified.
/// </summary>
/// <param name="path">The path to the field to return.</param>
/// <exception cref="ArgumentNullException">The <paramref name="path"/> specified is `null`.</exception>
/// <exception cref="ArgumentException">The <paramref name="path"/> specified is empty.</exception>
/// <exception cref="KeyNotFoundException">The key does not exist in the <see cref="JsonPlusObject"/> instance.</exception>
/// <exception cref="JsonPlusException">The <paramref name="path"/> specified is invalid.</exception>
/// <returns>The <see cref="JsonPlusObjectMember"/> associated with <paramref name="path"/>.</returns>
public JsonPlusObjectMember GetMember(JsonPlusPath path)
{
if (path == null)
{
throw new ArgumentNullException(nameof(path));
}
if (path.Count == 0)
{
throw new ArgumentException(RS.PathIsEmpty, nameof(path));
}
int pathIndex = 0;
JsonPlusObject currentObject = this;
while (true)
{
string key = path[pathIndex];
if (!currentObject.TryGetValue(key, out JsonPlusObjectMember field))
{
throw new KeyNotFoundException(string.Format(RS.ObjectMemberNotFoundByPath,
key, new JsonPlusPath(path.GetRange(0, pathIndex + 1)).Value));
}
if (pathIndex >= path.Count - 1)
{
return(field);
}
if (field.Type != JsonPlusType.Object)
{
throw new JsonPlusException(string.Format(RS.ObjectMemberInPathNotObject,
new JsonPlusPath(path.GetRange(0, pathIndex + 1)).Value));
}
currentObject = field.GetObject();
pathIndex = pathIndex + 1;
}
}
internal List <JsonPlusObjectMember> TraversePath(JsonPlusPath path)
{
List <JsonPlusObjectMember> result = new List <JsonPlusObjectMember>();
int pathLength = 1;
JsonPlusObject currentObject = this;
while (true)
{
JsonPlusObjectMember child = currentObject.GetOrCreateKey(new JsonPlusPath(path.GetRange(0, pathLength)));
result.Add(child);
pathLength++;
if (pathLength > path.Count)
{
return(result);
}
child.EnsureMemberIsObject();
// cannot use child.GetObject() because it would return a merged object, which
// breaks autoref with the parent object
currentObject = child.Value.GetObject();
}
}
/// <see cref="JsonPlusObject.Merge(JsonPlusObject)"/>
public override void Merge(JsonPlusObject other)
{
((JsonPlusObjectMember)Parent).Value.Add(other.Clone(((JsonPlusObjectMember)Parent).Value));
base.Merge(other);
}
// The owner in this context can be either an object or an array.
private JsonPlusObject ParseObject(IJsonPlusNode owner)
{
JsonPlusObject jpObject = new JsonPlusObject(owner);
if (_tokens.Current.Type != TokenType.StartOfObject &&
_tokens.Current.Type != TokenType.LiteralValue &&
_tokens.Current.Type != TokenType.Include)
{
throw JsonPlusParserException.Create(_tokens.Current, Path, string.Format(RS.UnexpectedTokenWith2AltInObject,
TokenType.StartOfObject, TokenType.LiteralValue,
_tokens.Current.Type));
}
bool headless = true;
if (_tokens.Current.Type == TokenType.StartOfObject)
{
headless = false;
ConsumeWhitelines();
}
IJsonPlusNode lastValue = null;
bool parsing = true;
while (parsing)
{
switch (_tokens.Current.Type)
{
case TokenType.Include:
case TokenType.OptionalInclude:
if (lastValue != null)
{
throw JsonPlusParserException.Create(_tokens.Current, Path, string.Format(RS.UnexpectedTokenWith2AltInObject,
TokenType.ArraySeparator, TokenType.EndOfLine,
_tokens.Current.Type));
}
lastValue = ParseInclude(jpObject);
break;
case TokenType.LiteralValue:
if (_tokens.Current.IsNonSignificant())
{
ConsumeWhitespace();
}
if (_tokens.Current.Type != TokenType.LiteralValue)
{
break;
}
if (lastValue != null)
{
throw JsonPlusParserException.Create(_tokens.Current, Path, string.Format(RS.UnexpectedTokenWith2AltInObject,
TokenType.ArraySeparator, TokenType.EndOfLine,
_tokens.Current.Type));
}
lastValue = ParseObjectMember(jpObject);
break;
// TODO: can an object be declared floating without being assigned to a field?
//case TokenType.StartOfObject:
case TokenType.Comment:
case TokenType.EndOfLine:
switch (lastValue)
{
case null:
ConsumeWhitelines();
break;
case JsonPlusObjectMember _:
break;
default:
((JsonPlusValue)jpObject.Parent).Add(lastValue.GetObject());
break;
}
lastValue = null;
ConsumeWhitelines();
break;
case TokenType.ArraySeparator:
switch (lastValue)
{
case null:
throw JsonPlusParserException.Create(_tokens.Current, Path, string.Format(RS.UnexpectedTokenWith2AltInObject,
TokenType.Assignment, TokenType.StartOfObject,
_tokens.Current.Type));
case JsonPlusObjectMember _:
break;
default:
((JsonPlusValue)jpObject.Parent).Add(lastValue.GetObject());
break;
}
lastValue = null;
ConsumeWhitelines();
break;
case TokenType.EndOfObject:
case TokenType.EndOfFile:
if (headless && _tokens.Current.Type != TokenType.EndOfFile)
{
throw JsonPlusParserException.Create(_tokens.Current, Path, string.Format(RS.UnexpectedTokenInObject, TokenType.EndOfFile, _tokens.Current.Type));
}
if (!headless && _tokens.Current.Type != TokenType.EndOfObject)
{
throw JsonPlusParserException.Create(_tokens.Current, Path, string.Format(RS.UnexpectedTokenInObject, TokenType.EndOfFile, _tokens.Current.Type));
}
switch (lastValue)
{
case null:
break;
case JsonPlusObjectMember _:
break;
default:
((JsonPlusValue)jpObject.Parent).Add(lastValue.GetObject());
break;
}
lastValue = null;
parsing = false;
break;
default:
throw JsonPlusParserException.Create(_tokens.Current, Path, string.Format(RS.ErrAtUnexpectedTokenInObject, _tokens.Current.Type));
}
}
if (_tokens.Current.Type == TokenType.EndOfObject)
{
_tokens.Next();
}
return(jpObject);
}
