private static Json RunParse(TrackedStringManager tracker, ParserRules rules)
{
Json output = new Json(tracker);
try
{
if (tracker.Text == null)
{
output.AddError("Null source text provided!");
tracker.HasChanges = false;
return(output);
}
JsonTextIndexer indexer = new JsonTextIndexer(tracker.Text, rules);
// TODO: Handle case where root is document without braces( ie "item : value, item2 : value2")
int indexOfFirstOpenBracket = indexer.NextAny(0, '{', '[');
// ============ No Brackets ===========
if (indexOfFirstOpenBracket == -1)
{
output.Data = new JsonValue(output.TextTracking, 0, indexer.NextAny(0, '}', ']'), false);
tracker.HasChanges = false;
return(output);
}
// ============ Has Brackets ===========
char nextBracket = output.TextTracking.Text[indexOfFirstOpenBracket];
if (nextBracket == '{')
{
output.Data = new JsonDocument(indexer, output.TextTracking, indexOfFirstOpenBracket, out int endIndex);
tracker.HasChanges = false;
return(output);
}
else // if(nextBracket == '[')
{
output.Data = new JsonArray(indexer, output.TextTracking, indexOfFirstOpenBracket, out int endIndex);
tracker.HasChanges = false;
return(output);
}
}
catch (Exception exc)
{
output.AddError(exc.ToString());
}
return(output);
}
// ===================[ Construction & Parsing ]===========================
/// <summary>
/// Constructor for parsing
/// </summary>
internal JsonArray(JsonTextIndexer indexer, TrackedStringManager source, int startIndex, out int endIndex) : base(source)
{
endIndex = -1;
int nextEval = indexer.NextAny(startIndex + 1);
int lastStart = startIndex + 1;
int quoteStart = -1;
bool lastWasUseful;
while (nextEval != -1)
{
lastWasUseful = true;
switch (source.Text[nextEval])
{
case ']':
if (quoteStart != -1)
{
break;
}
// There can be an unquoted array item inbetween the last comma'd item and the end
// bracket. To make sure we handle that case, but don't add empty elements, we're
// going to check it's an empty string before we add it.
//
// While empty keys and values will be supported (keys as long as they are unique)
// they must be quoted so we can tell when the item is supposed to end.
if (lastStart != nextEval)
{
this.Add(new JsonValue(source, lastStart, nextEval - 1, false));
}
endIndex = nextEval;
break;
case '[':
{
int endOfArr;
this.Add(new JsonArray(indexer, source, nextEval, out endOfArr));
if (endOfArr == -1)
{
throw new FormatException($"Invalid json format provided, issue starts with array that begins at text index {nextEval}");
}
int peekAheadInd = indexer.NextAny(endOfArr + 1);
if (peekAheadInd != -1 && source.Text[peekAheadInd] == ',')
{
nextEval = peekAheadInd;
}
else
{
nextEval = endOfArr;
}
}
break;
case '{':
{
if (quoteStart != -1)
{
break;
}
int endOfDoc;
this.Add(new JsonDocument(indexer, source, nextEval, out endOfDoc));
if (endOfDoc == -1)
{
throw new FormatException($"Invalid json format provided, issue starts with document that begins at text index {nextEval}");
}
int peekAheadInd = indexer.NextAny(endOfDoc + 1);
if (peekAheadInd != -1 && source.Text[peekAheadInd] == ',')
{
nextEval = peekAheadInd;
}
else
{
nextEval = endOfDoc;
}
}
break;
case ',':
if (quoteStart != -1)
{
break;
}
// We're safe to assume we can add this here because commas after docs are covered above
this.Add(new JsonValue(source, lastStart, nextEval - 1, false));
break;
case '\"':
if (quoteStart != -1)
{
this.Add(new JsonValue(source, quoteStart, nextEval - 1, true));
quoteStart = -1;
int peekAheadInd = indexer.NextAny(nextEval + 1);
if (peekAheadInd != -1 && source.Text[peekAheadInd] == ',')
{
nextEval = peekAheadInd;
}
}
else
{
quoteStart = nextEval + 1;
}
break;
default:
lastWasUseful = false;
break;
}
if (endIndex != -1)
{
break;
}
if (lastWasUseful)
{
lastStart = nextEval + 1;
}
nextEval = indexer.NextAny(nextEval + 1);
}
this.ResetStringValue(startIndex, endIndex);
this.Source.Track(this);
}
// =========================[ Constructor & Parsing ]===============================
/// <summary>
/// Constructor for parsing
/// </summary>
internal JsonDocument(JsonTextIndexer textIndexer, TrackedStringManager source, int startIndex, out int endIndex) : base(source)
{
endIndex = -1;
int nextEval = textIndexer.NextAny(startIndex + 1);
JsonHelper.IndexTrackingHelper keyIndexTracker = new JsonHelper.IndexTrackingHelper();
int lastStart = startIndex + 1;
int insideQuoteStart = -1;
bool lastWasUseful;
while (nextEval != -1)
{
lastWasUseful = true;
switch (source.Text[nextEval])
{
case '}':
if (insideQuoteStart != -1)
{
break;
}
if (keyIndexTracker)
{
this.Add(keyIndexTracker.CreateTS(source), new JsonValue(source, lastStart, nextEval - 1, false));
}
endIndex = nextEval;
break;
case '{':
{
if (insideQuoteStart != -1)
{
break;
}
int endOfDoc;
if (!keyIndexTracker)
{
throw new FormatException("Can't read json format - error found around offset: " + nextEval.ToString());
}
this.Add(keyIndexTracker.CreateTS(source),
new JsonDocument(textIndexer, source, nextEval, out endOfDoc));
if (endOfDoc == -1)
{
throw new FormatException($"Invalid json format provided, issue starts with document that begins at text index {nextEval}");
}
nextEval = endOfDoc;
keyIndexTracker.Reset();
}
break;
case '[':
{
if (insideQuoteStart != -1)
{
break;
}
if (!keyIndexTracker)
{
throw new FormatException("Can't read json format - attempted to add empty string key");
}
this.Add(keyIndexTracker.CreateTS(source),
new JsonArray(textIndexer, source, nextEval, out int endOfArr));
if (endOfArr == -1)
{
throw new FormatException($"Invalid json format provided, issue starts with array that begins at text index {nextEval}");
}
nextEval = endOfArr;
keyIndexTracker.Reset();
}
break;
case ':':
if (insideQuoteStart != -1)
{
break;
}
keyIndexTracker.StartIndex = lastStart;
keyIndexTracker.EndIndex = nextEval - 1;
break;
case '\"':
// Start quote
if (insideQuoteStart == -1)
{
insideQuoteStart = nextEval + 1;
}
// End quote
else
{
// Peek ahead so we can decide if it's a key or a value
// If the next thing is a colon, then it's a key, otherwise it's a value
int peekAheadInd = textIndexer.NextAny(nextEval + 1);
if (peekAheadInd != -1 && source.Text[peekAheadInd] == ':')
{
keyIndexTracker.StartIndex = insideQuoteStart;
keyIndexTracker.EndIndex = nextEval - 1; // One before the quote that was just found
keyIndexTracker.IsInsideQuotes = true;
nextEval = peekAheadInd;
}
else
{
if (!keyIndexTracker)
{
string quote = source.Text.Substring(insideQuoteStart, nextEval - 1);
throw new FormatException("Json parsing failed due to incorrect string formatting around string: " + quote);
}
this.Add(keyIndexTracker.CreateTS(source), new JsonValue(source, insideQuoteStart, nextEval - 1, true));
keyIndexTracker.Reset();
}
insideQuoteStart = -1;
}
break;
case ',':
if (insideQuoteStart != -1)
{
break;
}
if (keyIndexTracker)
{
var endValue = new JsonValue(source, lastStart, nextEval - 1, false);
if (endValue.StringValue.Length != 0)
{
this.Add(keyIndexTracker.CreateTS(source), endValue);
keyIndexTracker.Reset();
}
}
break;
default:
lastWasUseful = false;
break;
}
if (endIndex != -1)
{
break;
}
if (lastWasUseful)
{
lastStart = nextEval + 1;
}
nextEval = textIndexer.NextAny(nextEval + 1);
}
if (nextEval == -1)
{
throw new FormatException("Json was improperly formatted");
}
this.ResetStringValue(startIndex, endIndex);
this.Source.Track(this);
}
