/// <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);
}
/// <summary>
/// Initializes a new instance of the <see cref="JsonPlusSubstitution"/> class.
/// </summary>
/// <param name="parent">The <see cref="JsonPlusValue"/> parent of this substitution.</param>
/// <param name="path">The <see cref="JsonPlusPath"/> that this substitution is pointing to.</param>
/// <param name="required">Indicates whether this is a lazy substitution. Lazy substitutions uses the `${?` notation.</param>
/// <param name="location">The location of this substitution token in the source code, used for exception generation purposes.</param>
internal JsonPlusSubstitution(IJsonPlusNode parent, JsonPlusPath path, ISourceLocation location, bool required)
{
Parent = parent ?? throw new ArgumentNullException(nameof(parent), RS.CannotSubstitutionRootNode);
Column = location.Column;
Line = location.Line;
Required = required;
Path = path;
}
private IJsonPlusNode ParseSelfAssignArray(IJsonPlusNode owner)
{
// sanity check
if (_tokens.Current.Type != TokenType.SelfAssignment)
{
throw JsonPlusParserException.Create(_tokens.Current, Path, string.Format(RS.UnexpectedTokenInArray, TokenType.SelfAssignment, _tokens.Current.Type));
}
// consume += operator token
ConsumeWhitelines();
JsonPlusArray currentArray = new JsonPlusArray(owner);
switch (_tokens.Current.Type)
{
case TokenType.Include:
case TokenType.OptionalInclude:
// #todo
currentArray.Add(ParseInclude(currentArray));
break;
case TokenType.StartOfArray:
return(ParseArray(owner));
case TokenType.StartOfObject:
// #todo
currentArray.Add(ParseObject(currentArray));
break;
case TokenType.LiteralValue:
if (_tokens.Current.IsNonSignificant())
{
ConsumeWhitelines();
}
if (_tokens.Current.Type != TokenType.LiteralValue)
{
break;
}
currentArray.Add(ParseValue(currentArray));
return(currentArray);
case TokenType.OptionalSubstitution:
case TokenType.Substitution:
JsonPlusPath pointerPath = JsonPlusPath.Parse(_tokens.Current.Value);
JsonPlusSubstitution sub = new JsonPlusSubstitution(owner, pointerPath, _tokens.Current,
_tokens.Current.Type == TokenType.Substitution);
_substitutions.Add(sub);
_tokens.Next();
return(sub);
default:
throw JsonPlusParserException.Create(_tokens.Current, Path, string.Format(RS.UnexpectedTokenInArray, TokenType.EndOfArray, _tokens.Current.Type));
}
return(currentArray);
}
/// <summary>
/// Returns a node in the Json+ tree using Json+ path query expression.
/// </summary>
/// <param name="path">The Json+ path query expression.</param>
/// <returns>The value of a node selected by <paramref name="path"/>.</returns>
protected virtual JsonPlusValue GetNode(JsonPlusPath path)
{
if (Value.Type != JsonPlusType.Object)
{
throw new JsonPlusException(RS.RootNotAnObject);
}
return(Value.GetObject().GetValue(path));
}
/// <summary>
/// Returns a node as a <see cref="Nullable{Int64}"/> object by parsing the value as a number with data size unit.
/// </summary>
/// <param name="path">A Json+ query path that identifies a node in the current context.</param>
/// <returns>The <see cref="Nullable{Int64}"/> value of the node specified by <paramref name="path"/>.</returns>
/// <see cref="JsonPlusValue.GetByteSize()"/>
public long?GetByteSize(JsonPlusPath path)
{
JsonPlusValue value = GetNode(path);
if (ReferenceEquals(value, JsonPlusValue.Undefined))
{
return(null);
}
return(value.GetByteSize());
}
/// <summary>
/// Returns the value associated with the supplied key. If the supplied key is not found, one is created with a blank value.
/// </summary>
/// <param name="path">The path associated with the value.</param>
/// <returns>The value associated with <paramref name="path"/>.</returns>
private JsonPlusObjectMember GetOrCreateKey(JsonPlusPath path)
{
if (TryGetValue(path.Key, out JsonPlusObjectMember child))
{
return(child);
}
child = new JsonPlusObjectMember(path, this);
Add(path.Key, child);
return(child);
}
/// <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 a node as an enumerable collection <see cref="string"/>.
/// </summary>
/// <param name="path">A Json+ query path that identifies a node in the current context.</param>
/// <exception cref="JsonPlusParserException">The node cannot be casted into an array.</exception>
/// <returns>The <see cref="IList{String}"/> value of the node specified by <paramref name="path"/>.</returns>
public IList <string> GetStringList(JsonPlusPath path)
{
JsonPlusValue value = GetNode(path);
if (ReferenceEquals(value, JsonPlusValue.Undefined))
{
throw new JsonPlusParserException(string.Format(RS.ErrCastNodeByPathToArray, path));
}
return(value.GetStringList());
}
/// <summary>
/// Returns a node as a <see cref="TimeSpan"/>.
/// </summary>
/// <param name="path">A Json+ query path that identifies a node in the current context.</param>
/// <param name="defaultValue">The default value to return if the node specified by <paramref name="path"/> does not exist. Defaults to `null`.</param>
/// <param name="allowInfinite">Set to `true` to allow the keyword `infinite`. Otherwise, `false`. Defaults to `true`.</param>
/// <returns>The <see cref="TimeSpan"/> value of the node specified by <paramref name="path"/>, or <paramref name="defaultValue"/> if the node does not exist.</returns>
public TimeSpan GetTimeSpan(JsonPlusPath path, TimeSpan?defaultValue = null, bool allowInfinite = true)
{
JsonPlusValue value = GetNode(path);
if (value == null)
{
return(defaultValue.GetValueOrDefault());
}
return(value.GetTimeSpan(allowInfinite));
}
/// <summary>
/// Returns a node as an <see cref="long"/>.
/// </summary>
/// <param name="path">A Json+ query path that identifies a node in the current context.</param>
/// <param name="defaultValue">The default value to return if the node specified by <paramref name="path"/> does not exist. Defaults to zero.</param>
/// <returns>The <see cref="Int64"/> value of the node specified by <paramref name="path"/>, or <paramref name="defaultValue"/> if the node does not exist.</returns>
public long GetInt64(JsonPlusPath path, long defaultValue = 0)
{
JsonPlusValue value = GetNode(path);
if (ReferenceEquals(value, JsonPlusValue.Undefined))
{
return(defaultValue);
}
return(value.GetInt64());
}
/// <summary>
/// Returns a node as a <see cref="double"/>.
/// </summary>
/// <param name="path">A Json+ query path that identifies a node in the current context.</param>
/// <param name="defaultValue">The default value to return if the node specified by <paramref name="path"/> does not exist. Defaults to zero.</param>
/// <returns>The <see cref="double"/> value of the node specified by <paramref name="path"/>, or <paramref name="defaultValue"/> if the node does not exist.</returns>
public double GetDouble(JsonPlusPath path, double defaultValue = 0)
{
JsonPlusValue value = GetNode(path);
if (ReferenceEquals(value, JsonPlusValue.Undefined))
{
return(defaultValue);
}
return(value.GetDouble());
}
/// <summary>
/// Returns a node as a <see cref="float"/>.
/// </summary>
/// <param name="path">A Json+ query path that identifies a node in the current context.</param>
/// <param name="defaultValue">The default value to return if the node specified by <paramref name="path"/> does not exist. Defaults to zero.</param>
/// <returns>The <see cref="float"/> value of the node specified by <paramref name="path"/>, or <paramref name="defaultValue"/> if the node does not exist.</returns>
public float GetSingle(JsonPlusPath path, float defaultValue = 0)
{
JsonPlusValue value = GetNode(path);
if (ReferenceEquals(value, JsonPlusValue.Undefined))
{
return(defaultValue);
}
return(value.GetSingle());
}
/// <summary>
/// Return a node as a <see cref="bool"/>.
/// </summary>
/// <param name="path">A Json+ query path that identifies a node in the current context.</param>
/// <param name="defaultValue">The default value to return if the node specified by <paramref name="path"/> does not exist.</param>
/// <returns>The <see cref="bool"/> value of the node specified by <paramref name="path"/>, or <paramref name="defaultValue"/> if the node does not exist.</returns>
public bool GetBoolean(JsonPlusPath path, bool defaultValue = false)
{
JsonPlusValue value = GetNode(path);
if (ReferenceEquals(value, JsonPlusValue.Undefined))
{
return(defaultValue);
}
return(value.GetBoolean());
}
/// <summary>
/// Returns a node as an <see cref="int"/>.
/// </summary>
/// <param name="path">A Json+ query path that identifies a node in the current context.</param>
/// <param name="defaultValue">The default value to return if the node specified by <paramref name="path"/> does not exist. Defaults to zero.</param>
/// <returns>The <see cref="Int32"/> value of the node specified by <paramref name="path"/>, or <paramref name="defaultValue"/> if the node does not exist.</returns>
public int GetInt32(JsonPlusPath path, int defaultValue = 0)
{
JsonPlusValue value = GetNode(path);
if (ReferenceEquals(value, JsonPlusValue.Undefined))
{
return(defaultValue);
}
return(value.GetInt32());
}
/// <summary>
/// Returns a node as a <see cref="decimal"/>.
/// </summary>
/// <param name="path">A Json+ query path that identifies a node in the current context.</param>
/// <param name="defaultValue">The default value to return if the node specified by <paramref name="path"/> does not exist. Defaults to zero.</param>
/// <returns>The <see cref="decimal"/> value of the node specified by <paramref name="path"/>, or <paramref name="defaultValue"/> if the node does not exist.</returns>
public decimal GetDecimal(JsonPlusPath path, decimal defaultValue = 0)
{
JsonPlusValue value = GetNode(path);
if (ReferenceEquals(value, JsonPlusValue.Undefined))
{
return(defaultValue);
}
return(value.GetDecimal());
}
/// <summary>
/// Returns the backing <see cref="JsonPlusValue"/> value of the <see cref="JsonPlusObjectMember"/> associated with
/// the <see cref="JsonPlusPath"/> specified. The path is relative to the this instance.
/// </summary>
/// <param name="path">The relative <see cref="JsonPlusPath"/> path associated with the <see cref="JsonPlusObjectMember"/> of the <see cref="JsonPlusValue"/>.</param>
/// <param name="result">If the field is returned successfully, this parameter will contain the backing <see cref="JsonPlusValue"/> of the <see cref="JsonPlusObjectMember"/> associated
/// with <paramref name="path"/> (if the path is resolvable). This parameter should be passed uninitialized.</param>
/// <returns>`true` if the <see cref="JsonPlusObject"/> contains the <see cref="JsonPlusObjectMember"/> resolvable by the <paramref name="path"/> specified. Otherwise, `false`.</returns>
public bool TryGetValue(JsonPlusPath path, out JsonPlusValue result)
{
result = null;
if (!TryGetMember(path, out JsonPlusObjectMember field))
{
return(false);
}
result = field.Value;
return(true);
}
/// <summary>
/// Determine whether a node exists at the specified path.
/// </summary>
/// <param name="path">A Json+ query path that specifies a node.</param>
/// <returns>`true` if a node exists at the <paramref name="path"/> specified. Otherwise, `false`.</returns>
public bool HasPath(JsonPlusPath path)
{
JsonPlusValue node;
try
{
node = GetNode(path);
}
catch
{
return(false);
}
return(node != null);
}
internal bool IsChildPathOf(JsonPlusPath parentPath)
{
if (Count < parentPath.Count)
{
return(false);
}
for (int i = 0; i < parentPath.Count; ++i)
{
if (this[i] != parentPath[i])
{
return(false);
}
}
return(true);
}
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]);
}
// parse path value
private JsonPlusPath ParseKey()
{
while (_tokens.Current.LiteralType == LiteralTokenType.Whitespace)
{
_tokens.Next();
}
// sanity check
if (_tokens.Current.Type != TokenType.LiteralValue)
{
throw JsonPlusParserException.Create(_tokens.Current, Path, string.Format(RS.UnexpectedKeyType, TokenType.LiteralValue, _tokens.Current.Type));
}
if (_tokens.Current.IsNonSignificant())
{
ConsumeWhitelines();
}
if (_tokens.Current.Type != TokenType.LiteralValue)
{
return(null);
}
TokenizeResult keyTokens = new TokenizeResult();
while (_tokens.Current.Type == TokenType.LiteralValue)
{
keyTokens.Add(_tokens.Current);
_tokens.Next();
}
keyTokens.Reverse();
while (keyTokens.Count > 0 && keyTokens[0].LiteralType == LiteralTokenType.Whitespace)
{
keyTokens.RemoveAt(0);
}
keyTokens.Reverse();
keyTokens.Add(new Token(string.Empty, TokenType.EndOfFile, null));
return(JsonPlusPath.FromTokens(keyTokens));
}
/// <summary>
/// Returns a value indicating whether the value of this instance is equal to the value of the specified <see cref="JsonPlusPath"/> instance.
/// </summary>
/// <param name="other">The object to compare to this instance.</param>
/// <returns>`true` if the <paramref name="other"/> parameter equals the value of this instance. Otherwise, `false`.</returns>
public bool Equals(JsonPlusPath other)
{
if (other is null)
{
return(false);
}
if (Count != other.Count)
{
return(false);
}
for (int i = 0; i < Count; ++i)
{
if (this[i] != other[i])
{
return(false);
}
}
return(true);
}
private JsonPlusPath GetMemberPath(JsonPlusObjectMember member, JsonPlusPath subPath)
{
if (member.ParentMember == null && subPath == null)
{
return(new JsonPlusPath(new string[] { member.Key }));
}
if (subPath == null)
{
return(GetMemberPath(member.ParentMember, new JsonPlusPath(new string[] { member.Key })));
}
subPath.Add(member.Key);
if (member.ParentMember == null)
{
return(subPath);
}
return(GetMemberPath(member.ParentMember, subPath));
}
/// <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="HasPath(JsonPlusPath)"/>
public bool HasPath(string path)
{
return(HasPath(JsonPlusPath.Parse(path)));
}
