public bool TryParse(string source, ref int index, [NotNullWhen(true)] out JsonValue?value, [NotNullWhen(false)] out string?errorMessage, bool allowExtraChars)
{
Debug.Assert(index < source.Length && source[index] == '[');
var complete = false;
var array = new JsonArray();
value = array;
var length = source.Length;
index++;
while (index < length)
{
errorMessage = source.SkipWhiteSpace(ref index, length, out char c);
if (errorMessage != null)
{
return(false);
}
// check for empty array
if (c == ']')
{
if (array.Count == 0)
{
complete = true;
index++;
break;
}
errorMessage = "Expected value.";
return(false);
}
// get value
var success = JsonParser.TryParse(source, ref index, out var item, out errorMessage);
array.Add(item !);
if (!success)
{
return(false);
}
errorMessage = source.SkipWhiteSpace(ref index, length, out c);
if (errorMessage != null)
{
return(false);
}
// check for end or separator
index++;
if (c == ']')
{
complete = true;
break;
}
if (c != ',')
{
errorMessage = "Expected ','.";
return(false);
}
}
if (!complete)
{
errorMessage = "Unterminated array (missing ']')";
return(false);
}
errorMessage = null;
return(true);
}
public bool TryParse(TextReader stream, [NotNullWhen(true)] out JsonValue?value, [NotNullWhen(false)] out string?errorMessage)
{
Debug.Assert(stream.Peek() == '[');
bool complete = false;
var array = new JsonArray();
value = array;
while (stream.Peek() != -1)
{
stream.Read(); // waste the '[' or ','
errorMessage = stream.SkipWhiteSpace(out var c);
if (errorMessage != null)
{
return(false);
}
// check for empty array
if (c == ']')
{
if (array.Count == 0)
{
complete = true;
stream.Read(); // waste the ']'
break;
}
errorMessage = "Expected value.";
return(false);
}
// get value
var success = JsonParser.TryParse(stream, out var item, out errorMessage);
array.Add(item !);
if (!success)
{
return(false);
}
errorMessage = stream.SkipWhiteSpace(out c);
if (errorMessage != null)
{
return(false);
}
// check for end or separator
if (c == ']')
{
complete = true;
stream.Read(); // waste the ']'
break;
}
if (c != ',')
{
errorMessage = "Expected ','.";
return(false);
}
}
if (!complete)
{
errorMessage = "Unterminated array (missing ']')";
return(false);
}
errorMessage = null;
return(true);
}
public async Task <(string?errorMessage, JsonValue?value)> TryParseAsync(TextReader stream, CancellationToken token)
{
Debug.Assert(stream.Peek() == '[');
var scratch = SmallBufferCache.Acquire(1);
var array = new JsonArray();
bool complete = false;
string?errorMessage = null;
while (stream.Peek() != -1)
{
if (token.IsCancellationRequested)
{
errorMessage = "Parsing incomplete. The task was cancelled.";
break;
}
await stream.TryRead(scratch, 0, 1, token); // waste the '[' or ','
char c;
(errorMessage, c) = await stream.SkipWhiteSpaceAsync(scratch);
if (errorMessage != null)
{
break;
}
// check for empty array
if (c == ']')
{
if (array.Count == 0)
{
complete = true;
await stream.TryRead(scratch, 0, 1, token); // waste the ']'
break;
}
errorMessage = "Expected value.";
break;
}
// get value
JsonValue?item;
(errorMessage, item) = await JsonParser.TryParseAsync(stream, token);
array.Add(item !);
if (errorMessage != null)
{
break;
}
(errorMessage, c) = await stream.SkipWhiteSpaceAsync(scratch);
if (errorMessage != null)
{
break;
}
// check for end or separator
if (c == ']')
{
complete = true;
await stream.TryRead(scratch, 0, 1, token); // waste the ']'
break;
}
if (c != ',')
{
errorMessage = "Expected ','.";
break;
}
}
if (!complete)
{
errorMessage ??= "Unterminated array (missing ']')";
}
SmallBufferCache.Release(scratch);
return(errorMessage, array);
}