private void ReadLiteral(string literal)
{
for (int i = 1; i < literal.Length; ++i)
{
var next = _reader.Peek();
if (next != literal[i])
{
throw new JsonDeserializerException(
JsonDeserializerResource.Format_UnrecognizedLiteral(literal),
_line, _column);
}
else
{
ReadNextChar();
}
}
var tail = _reader.Peek();
if (tail != '}' &&
tail != ']' &&
tail != ',' &&
tail != '\n' &&
tail != -1 &&
!IsWhitespace(tail))
{
throw new JsonDeserializerException(
JsonDeserializerResource.Format_IllegalTrailingCharacterAfterLiteral(tail, literal),
_line, _column);
}
}
public JsonNumber(JsonToken token)
: base(token.Line, token.Column)
{
try
{
_raw = token.Value;
_double = double.Parse(_raw, NumberStyles.Float);
}
catch (FormatException ex)
{
throw new JsonDeserializerException(
JsonDeserializerResource.Format_InvalidFloatNumberFormat(_raw),
ex,
token.Line,
token.Column);
}
catch (OverflowException ex)
{
throw new JsonDeserializerException(
JsonDeserializerResource.Format_FloatNumberOverflow(_raw),
ex,
token.Line,
token.Column);
}
}
private static JsonArray DeserializeArray(JsonToken head, JsonBuffer buffer)
{
var list = new List <JsonValue>();
while (true)
{
var next = buffer.Read();
if (next.Type == JsonTokenType.RightSquareBracket)
{
break;
}
list.Add(DeserializeInternal(next, buffer));
next = buffer.Read();
if (next.Type == JsonTokenType.EOF)
{
throw new JsonDeserializerException(
JsonDeserializerResource.Format_InvalidSyntaxExpectation("JSON array", ']', ','),
next);
}
else if (next.Type == JsonTokenType.RightSquareBracket)
{
break;
}
else if (next.Type != JsonTokenType.Comma)
{
throw new JsonDeserializerException(
JsonDeserializerResource.Format_InvalidSyntaxExpectation("JSON array", ','),
next);
}
}
return(new JsonArray(list.ToArray(), head.Line, head.Column));
}
private static JsonValue DeserializeInternal(JsonToken next, JsonBuffer buffer)
{
if (next.Type == JsonTokenType.EOF)
{
return(null);
}
if (next.Type == JsonTokenType.LeftSquareBracket)
{
return(DeserializeArray(next, buffer));
}
if (next.Type == JsonTokenType.LeftCurlyBracket)
{
return(DeserializeObject(next, buffer));
}
if (next.Type == JsonTokenType.String)
{
return(new JsonString(next.Value, next.Line, next.Column));
}
if (next.Type == JsonTokenType.True || next.Type == JsonTokenType.False)
{
return(new JsonBoolean(next));
}
if (next.Type == JsonTokenType.Null)
{
return(new JsonNull(next.Line, next.Column));
}
if (next.Type == JsonTokenType.Number)
{
return(new JsonNumber(next));
}
throw new JsonDeserializerException(JsonDeserializerResource.Format_InvalidTokenExpectation(
next.Value, "'{', '[', true, false, null, JSON string, JSON number, or the end of the file"),
next);
}
public static JsonValue Deserialize(TextReader reader)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
var buffer = new JsonBuffer(reader);
var result = DeserializeInternal(buffer.Read(), buffer);
// There are still unprocessed char. The parsing is not finished. Error happened.
var nextToken = buffer.Read();
if (nextToken.Type != JsonTokenType.EOF)
{
throw new JsonDeserializerException(
JsonDeserializerResource.Format_UnfinishedJSON(nextToken.Value),
nextToken);
}
return(result);
}
public JsonToken Read()
{
int first;
while (true)
{
first = ReadNextChar();
if (first == -1)
{
_token.Type = JsonTokenType.EOF;
return(_token);
}
else if (!IsWhitespace(first))
{
break;
}
}
_token.Value = ((char)first).ToString();
_token.Line = _line;
_token.Column = _column;
if (first == '{')
{
_token.Type = JsonTokenType.LeftCurlyBracket;
}
else if (first == '}')
{
_token.Type = JsonTokenType.RightCurlyBracket;
}
else if (first == '[')
{
_token.Type = JsonTokenType.LeftSquareBracket;
}
else if (first == ']')
{
_token.Type = JsonTokenType.RightSquareBracket;
}
else if (first == ':')
{
_token.Type = JsonTokenType.Colon;
}
else if (first == ',')
{
_token.Type = JsonTokenType.Comma;
}
else if (first == '"')
{
_token.Type = JsonTokenType.String;
_token.Value = ReadString();
}
else if (first == 't')
{
ReadLiteral(ValueTrue);
_token.Type = JsonTokenType.True;
}
else if (first == 'f')
{
ReadLiteral(ValueFalse);
_token.Type = JsonTokenType.False;
}
else if (first == 'n')
{
ReadLiteral(ValueNull);
_token.Type = JsonTokenType.Null;
}
else if ((first >= '0' && first <= '9') || first == '-')
{
_token.Type = JsonTokenType.Number;
_token.Value = ReadNumber(first);
}
else
{
throw new JsonDeserializerException(
JsonDeserializerResource.Format_IllegalCharacter(first),
_token);
}
// JsonToken is a value type
return(_token);
}
private string ReadString()
{
_buffer.Clear();
var escaped = false;
while (true)
{
var next = ReadNextChar();
if (next == -1 || next == '\n')
{
throw new JsonDeserializerException(
JsonDeserializerResource.JSON_OpenString,
_line, _column);
}
else if (escaped)
{
if ((next == '"') || (next == '\\') || (next == '/'))
{
_buffer.Append((char)next);
}
else if (next == 'b')
{
// '\b' backspace
_buffer.Append('\b');
}
else if (next == 'f')
{
// '\f' form feed
_buffer.Append('\f');
}
else if (next == 'n')
{
// '\n' line feed
_buffer.Append('\n');
}
else if (next == 'r')
{
// '\r' carriage return
_buffer.Append('\r');
}
else if (next == 't')
{
// '\t' tab
_buffer.Append('\t');
}
else if (next == 'u')
{
// '\uXXXX' unicode
var unicodeLine = _line;
var unicodeColumn = _column;
_codePointBuffer.Clear();
for (int i = 0; i < 4; ++i)
{
next = ReadNextChar();
if (next == -1)
{
throw new JsonDeserializerException(
JsonDeserializerResource.JSON_InvalidEnd,
unicodeLine,
unicodeColumn);
}
else
{
_codePointBuffer[i] = (char)next;
}
}
try
{
var unicodeValue = int.Parse(_codePointBuffer.ToString(), NumberStyles.HexNumber, CultureInfo.InvariantCulture);
_buffer.Append((char)unicodeValue);
}
catch (FormatException ex)
{
throw new JsonDeserializerException(
JsonDeserializerResource.Format_InvalidUnicode(_codePointBuffer.ToString()),
ex,
unicodeLine,
unicodeColumn);
}
}
else
{
throw new JsonDeserializerException(
JsonDeserializerResource.Format_InvalidSyntaxNotExpected("charactor escape", "\\" + next),
_line,
_column);
}
escaped = false;
}
else if (next == '\\')
{
escaped = true;
}
else if (next == '"')
{
break;
}
else
{
_buffer.Append((char)next);
}
}
return(_buffer.ToString());
}
private static JsonObject DeserializeObject(JsonToken head, JsonBuffer buffer)
{
var dictionary = new Dictionary <string, JsonValue>();
// Loop through each JSON entry in the input object
while (true)
{
var next = buffer.Read();
if (next.Type == JsonTokenType.EOF)
{
throw new JsonDeserializerException(
JsonDeserializerResource.Format_InvalidSyntaxExpectation("JSON object", '}'),
next);
}
if (next.Type == JsonTokenType.Colon)
{
throw new JsonDeserializerException(
JsonDeserializerResource.Format_InvalidSyntaxNotExpected("JSON object", ':'),
next);
}
else if (next.Type == JsonTokenType.RightCurlyBracket)
{
break;
}
else
{
if (next.Type != JsonTokenType.String)
{
throw new JsonDeserializerException(
JsonDeserializerResource.Format_InvalidSyntaxExpectation("JSON object member name", "JSON string"),
next);
}
var memberName = next.Value;
if (dictionary.ContainsKey(memberName))
{
throw new JsonDeserializerException(
JsonDeserializerResource.Format_DuplicateObjectMemberName(memberName),
next);
}
next = buffer.Read();
if (next.Type != JsonTokenType.Colon)
{
throw new JsonDeserializerException(
JsonDeserializerResource.Format_InvalidSyntaxExpectation("JSON object", ':'),
next);
}
dictionary[memberName] = DeserializeInternal(buffer.Read(), buffer);
next = buffer.Read();
if (next.Type == JsonTokenType.RightCurlyBracket)
{
break;
}
else if (next.Type != JsonTokenType.Comma)
{
throw new JsonDeserializerException(
JsonDeserializerResource.Format_InvalidSyntaxExpectation("JSON object", ',', '}'),
next);
}
}
}
return(new JsonObject(dictionary, head.Line, head.Column));
}
