public static dynamic Parse(String s)
{
// todo. strictly speaking, this should be inserted directly into lexer
// and exposed via JsonReader configuration (similarly to AllowComments and AllowSingleQuotedStrings)
// however, I'm too feeble to manually tinker lexer's FSM: http://litjson.sourceforge.net/doc/manual.html#appendix.parser.lexer.table
s = QuotePropertyNames(s ?? String.Empty);
var reader = new JsonReader(s);
if (!reader.Read()) throw new JsonException("Input string is empty");
return ReadJson(reader);
}
private static JsonArray ReadArray(JsonReader reader)
{
(reader.Token == JsonToken.ArrayStart).AssertTrue();
var json = new JsonArray();
while (reader.Read())
{
var end_of_array = false;
switch (reader.Token)
{
case JsonToken.Int:
case JsonToken.Long:
case JsonToken.Double:
case JsonToken.String:
case JsonToken.Boolean:
case JsonToken.Null:
case JsonToken.ObjectStart:
case JsonToken.ArrayStart:
json.Add(ReadJson(reader));
break;
case JsonToken.ArrayEnd:
end_of_array = true;
break;
case JsonToken.None:
case JsonToken.PropertyName:
case JsonToken.ObjectEnd:
default:
throw new JsonException(String.Format("Unexpected token {0} when reading array", reader.Token));
}
if (end_of_array) break;
}
if (reader.Token != JsonToken.ArrayEnd) throw new JsonException(String.Format("Unexpected end of array at token {0}", reader.Token));
return json;
}
private static JsonObject ReadObject(JsonReader reader)
{
(reader.Token == JsonToken.ObjectStart).AssertTrue();
var json = new JsonObject();
const int gief_key = 0, gief_value = 1;
var state = gief_key;
String key = null;
while (reader.Read())
{
var end_of_object = false;
switch (reader.Token)
{
case JsonToken.PropertyName:
if (state != gief_key) throw new JsonException(String.Format("Unexpected token {0} when reading object in state {1}", reader.Token, state));
key = reader.Value.AssertCast<String>();
state = gief_value;
break;
case JsonToken.Int:
case JsonToken.Long:
case JsonToken.Double:
case JsonToken.String:
case JsonToken.Boolean:
case JsonToken.Null:
case JsonToken.ObjectStart:
case JsonToken.ArrayStart:
if (state != gief_value) throw new JsonException(String.Format("Unexpected token {0} when reading object in state {1}", reader.Token, state));
json.Add(key, ReadJson(reader));
state = gief_key;
break;
case JsonToken.ObjectEnd:
if (state != gief_key) throw new JsonException(String.Format("Unexpected end of object in state {0}", state));
end_of_object = true;
break;
case JsonToken.None:
case JsonToken.ArrayEnd:
default:
throw new JsonException(String.Format("Unexpected token {0} when reading object in state {1}", reader.Token, state));
}
if (end_of_object) break;
}
if (reader.Token != JsonToken.ObjectEnd) throw new JsonException(String.Format("Unexpected end of object at token {0} in state {1}", reader.Token, state));
return json;
}
private static JsonPrimitive ReadPrimitive(JsonReader reader)
{
return new JsonPrimitive(reader.Value);
}
private static Json ReadJson(JsonReader reader)
{
switch (reader.Token)
{
case JsonToken.ObjectStart:
return ReadObject(reader);
case JsonToken.ArrayStart:
return ReadArray(reader);
case JsonToken.Int:
case JsonToken.Long:
case JsonToken.Double:
case JsonToken.String:
case JsonToken.Boolean:
case JsonToken.Null:
return ReadPrimitive(reader);
case JsonToken.None:
case JsonToken.PropertyName:
case JsonToken.ObjectEnd:
case JsonToken.ArrayEnd:
default:
throw new JsonException(String.Format("Unexpected token {0} when reading json", reader.Token));
}
}
