/// <summary>
/// Parse a sequence as UTF-8-encoded text representing a single JSON value into a JsonDocument.
/// </summary>
/// <remarks>
/// <para>
/// The <see cref="ReadOnlySequence{T}"/> may be used for the entire lifetime of the
/// JsonDocument object, and the caller must ensure that the data therein does not change during
/// the object lifetime.
/// </para>
///
/// <para>
/// Because the input is considered to be text, a UTF-8 Byte-Order-Mark (BOM) must not be present.
/// </para>
/// </remarks>
/// <param name="utf8Json">JSON text to parse.</param>
/// <param name="options">Options to control the reader behavior during parsing.</param>
/// <returns>
/// A JsonDocument representation of the JSON value.
/// </returns>
/// <exception cref="JsonException">
/// <paramref name="utf8Json"/> does not represent a valid single JSON value.
/// </exception>
/// <exception cref="ArgumentException">
/// <paramref name="options"/> contains unsupported options.
/// </exception>
public static JsonDocument Parse(ReadOnlySequence <byte> utf8Json, JsonDocumentOptions options = default)
{
JsonReaderOptions readerOptions = options.GetReaderOptions();
if (utf8Json.IsSingleSegment)
{
return(Parse(utf8Json.First, readerOptions));
}
int length = checked ((int)utf8Json.Length);
byte[] utf8Bytes = ArrayPool <byte> .Shared.Rent(length);
try
{
utf8Json.CopyTo(utf8Bytes.AsSpan());
return(Parse(utf8Bytes.AsMemory(0, length), readerOptions, utf8Bytes));
}
catch
{
// Holds document content, clear it before returning it.
utf8Bytes.AsSpan(0, length).Clear();
ArrayPool <byte> .Shared.Return(utf8Bytes);
throw;
}
}
internal static JsonDocument ParseValue(ReadOnlyMemory <char> json, JsonDocumentOptions options)
{
ReadOnlySpan <char> jsonChars = json.Span;
int expectedByteCount = JsonReaderHelper.GetUtf8ByteCount(jsonChars);
byte[] owned;
byte[] utf8Bytes = ArrayPool <byte> .Shared.Rent(expectedByteCount);
try
{
int actualByteCount = JsonReaderHelper.GetUtf8FromText(jsonChars, utf8Bytes);
Debug.Assert(expectedByteCount == actualByteCount);
owned = new byte[actualByteCount];
Buffer.BlockCopy(utf8Bytes, 0, owned, 0, actualByteCount);
}
finally
{
// Holds document content, clear it before returning it.
utf8Bytes.AsSpan(0, expectedByteCount).Clear();
ArrayPool <byte> .Shared.Return(utf8Bytes);
}
return(ParseUnrented(owned.AsMemory(), options.GetReaderOptions()));
}
/// <summary>
/// Parses text representing a single JSON value into a JsonDocument.
/// </summary>
/// <remarks>
/// The <see cref="ReadOnlyMemory{T}"/> value may be used for the entire lifetime of the
/// JsonDocument object, and the caller must ensure that the data therein does not change during
/// the object lifetime.
/// </remarks>
/// <param name="json">JSON text to parse.</param>
/// <param name="options">Options to control the reader behavior during parsing.</param>
/// <returns>
/// A JsonDocument representation of the JSON value.
/// </returns>
/// <exception cref="JsonException">
/// <paramref name="json"/> does not represent a valid single JSON value.
/// </exception>
/// <exception cref="ArgumentException">
/// <paramref name="options"/> contains unsupported options.
/// </exception>
public static JsonDocument Parse([StringSyntax(StringSyntaxAttribute.Json)] ReadOnlyMemory <char> json, JsonDocumentOptions options = default)
{
ReadOnlySpan <char> jsonChars = json.Span;
int expectedByteCount = JsonReaderHelper.GetUtf8ByteCount(jsonChars);
byte[] utf8Bytes = ArrayPool <byte> .Shared.Rent(expectedByteCount);
try
{
int actualByteCount = JsonReaderHelper.GetUtf8FromText(jsonChars, utf8Bytes);
Debug.Assert(expectedByteCount == actualByteCount);
return(Parse(
utf8Bytes.AsMemory(0, actualByteCount),
options.GetReaderOptions(),
utf8Bytes));
}
catch
{
// Holds document content, clear it before returning it.
utf8Bytes.AsSpan(0, expectedByteCount).Clear();
ArrayPool <byte> .Shared.Return(utf8Bytes);
throw;
}
}
internal static JsonDocument ParseRented(PooledByteBufferWriter utf8Json, JsonDocumentOptions options = default)
{
return(Parse(
utf8Json.WrittenMemory,
options.GetReaderOptions(),
extraRentedArrayPoolBytes: null,
extraPooledByteBufferWriter: utf8Json));
}
internal static JsonDocument ParseValue(ReadOnlySpan <byte> utf8Json, JsonDocumentOptions options)
{
Debug.Assert(utf8Json != null);
byte[] owned = new byte[utf8Json.Length];
utf8Json.CopyTo(owned);
return(ParseUnrented(owned.AsMemory(), options.GetReaderOptions()));
}
internal static JsonDocument ParseValue(Stream utf8Json, JsonDocumentOptions options)
{
Debug.Assert(utf8Json != null);
ArraySegment <byte> drained = ReadToEnd(utf8Json);
Debug.Assert(drained.Array != null);
byte[] owned = new byte[drained.Count];
Buffer.BlockCopy(drained.Array, 0, owned, 0, drained.Count);
// Holds document content, clear it before returning it.
drained.AsSpan().Clear();
ArrayPool <byte> .Shared.Return(drained.Array);
return(ParseUnrented(owned.AsMemory(), options.GetReaderOptions()));
}
private static async Task <JsonDocument> ParseAsyncCore(
Stream utf8Json,
JsonDocumentOptions options = default,
CancellationToken cancellationToken = default)
{
ArraySegment <byte> drained = await ReadToEndAsync(utf8Json, cancellationToken).ConfigureAwait(false);
try
{
return(Parse(drained.AsMemory(), options.GetReaderOptions(), drained.Array));
}
catch
{
// Holds document content, clear it before returning it.
drained.AsSpan().Clear();
ArrayPool <byte> .Shared.Return(drained.Array);
throw;
}
}
/// <summary>
/// Parse a <see cref="Stream"/> as UTF-8-encoded data representing a single JSON value into a
/// JsonDocument. The Stream will be read to completion.
/// </summary>
/// <param name="utf8Json">JSON data to parse.</param>
/// <param name="options">Options to control the reader behavior during parsing.</param>
/// <returns>
/// A JsonDocument representation of the JSON value.
/// </returns>
/// <exception cref="JsonException">
/// <paramref name="utf8Json"/> does not represent a valid single JSON value.
/// </exception>
/// <exception cref="ArgumentException">
/// <paramref name="options"/> contains unsupported options.
/// </exception>
public static JsonDocument Parse(Stream utf8Json, JsonDocumentOptions options = default)
{
if (utf8Json == null)
{
throw new ArgumentNullException(nameof(utf8Json));
}
ArraySegment <byte> drained = ReadToEnd(utf8Json);
try
{
return(Parse(drained.AsMemory(), options.GetReaderOptions(), drained.Array));
}
catch
{
// Holds document content, clear it before returning it.
drained.AsSpan().Clear();
ArrayPool <byte> .Shared.Return(drained.Array);
throw;
}
}
/// <summary>
/// Parse memory as UTF-8-encoded text representing a single JSON value into a JsonDocument.
/// </summary>
/// <remarks>
/// <para>
/// The <see cref="ReadOnlyMemory{T}"/> value will be used for the entire lifetime of the
/// JsonDocument object, and the caller must ensure that the data therein does not change during
/// the object lifetime.
/// </para>
///
/// <para>
/// Because the input is considered to be text, a UTF-8 Byte-Order-Mark (BOM) must not be present.
/// </para>
/// </remarks>
/// <param name="utf8Json">JSON text to parse.</param>
/// <param name="options">Options to control the reader behavior during parsing.</param>
/// <returns>
/// A JsonDocument representation of the JSON value.
/// </returns>
/// <exception cref="JsonException">
/// <paramref name="utf8Json"/> does not represent a valid single JSON value.
/// </exception>
/// <exception cref="ArgumentException">
/// <paramref name="options"/> contains unsupported options.
/// </exception>
public static JsonDocument Parse(ReadOnlyMemory <byte> utf8Json, JsonDocumentOptions options = default)
{
return(Parse(utf8Json, options.GetReaderOptions()));
}
/// <summary>
/// Parses a string representing JSON document into <see cref="JsonNode"/>.
/// </summary>
/// <param name="json">JSON to parse.</param>
/// <param name="options">Options to control the reader behavior during parsing.</param>
/// <param name="duplicatePropertyNameHandling">Specifies the way of handling duplicate property names.</param>
/// <returns><see cref="JsonNode"/> representation of <paramref name="json"/>.</returns>
public static JsonNode Parse(string json, JsonDocumentOptions options = default, DuplicatePropertyNameHandling duplicatePropertyNameHandling = DuplicatePropertyNameHandling.Replace)
{
Utf8JsonReader reader = new Utf8JsonReader(Encoding.UTF8.GetBytes(json), options.GetReaderOptions());
var currentNodes = new Stack <KeyValuePair <string, JsonNode> >(); // nodes currently being created
JsonNode toReturn = null;
while (reader.Read())
{
JsonTokenType tokenType = reader.TokenType;
KeyValuePair <string, JsonNode> currentPair = new KeyValuePair <string, JsonNode>();
if (currentNodes.Any())
{
currentPair = currentNodes.Peek();
}
void AddNewPair(JsonNode jsonNode, bool keepInCurrentNodes = false)
{
KeyValuePair <string, JsonNode> newProperty;
if (currentPair.Value == null)
{
// If previous token was property name,
// it was added to stack with not null name and null value,
// otherwise, this is first JsonNode added
if (currentPair.Key != null)
{
// Create as property, keep name, replace null with new JsonNode:
currentNodes.Pop();
newProperty = new KeyValuePair <string, JsonNode>(currentPair.Key, jsonNode);
}
else
{
// Add first JsonNode:
newProperty = new KeyValuePair <string, JsonNode>(null, jsonNode);
}
}
else
{
// Create as value:
newProperty = new KeyValuePair <string, JsonNode>(null, jsonNode);
}
if (keepInCurrentNodes)
{
// If after adding property, it should be kept in currentNodes, it must be JsonObject or JsonArray
Debug.Assert(jsonNode.ValueKind == JsonValueKind.Object || jsonNode.ValueKind == JsonValueKind.Array);
currentNodes.Push(newProperty);
}
else
{
AddToParent(newProperty, ref currentNodes, ref toReturn, duplicatePropertyNameHandling);
}
}
switch (tokenType)
{
case JsonTokenType.StartObject:
AddNewPair(new JsonObject(), true);
break;
case JsonTokenType.EndObject:
Debug.Assert(currentPair.Value is JsonObject);
currentNodes.Pop();
AddToParent(currentPair, ref currentNodes, ref toReturn, duplicatePropertyNameHandling);
break;
case JsonTokenType.StartArray:
AddNewPair(new JsonArray(), true);
break;
case JsonTokenType.EndArray:
Debug.Assert(currentPair.Value is JsonArray);
currentNodes.Pop();
AddToParent(currentPair, ref currentNodes, ref toReturn, duplicatePropertyNameHandling);
break;
case JsonTokenType.PropertyName:
currentNodes.Push(new KeyValuePair <string, JsonNode>(reader.GetString(), null));
break;
case JsonTokenType.Number:
AddNewPair(new JsonNumber(JsonHelpers.Utf8GetString(reader.ValueSpan)));
break;
case JsonTokenType.String:
AddNewPair(new JsonString(reader.GetString()));
break;
case JsonTokenType.True:
AddNewPair(new JsonBoolean(true));
break;
case JsonTokenType.False:
AddNewPair(new JsonBoolean(false));
break;
case JsonTokenType.Null:
AddNewPair(new JsonNull());
break;
}
}
Debug.Assert(toReturn != null);
return(toReturn);
}