/// <summary>
/// Internal init constuctor.
/// </summary>
internal JSonReaderException(string message, JSonReaderTokenInfo token)
: base(PrepareMessage(message, token))
{
InvalidToken = token != null ? token.Text : string.Empty;
Line = token != null ? token.Line : 0;
Offset = token != null ? token.Offset : 0;
}
/// <summary>
/// Reads a keyword from the input stream.
/// </summary>
private object ReadKeyword()
{
JSonReaderTokenInfo topToken = PopTopToken();
// top token contains the first letter of current keyword:
StringBuilder buffer = new StringBuilder(topToken.Text);
int lastLine = _input.Line;
int lastOffset = _input.LineOffset;
StringHelper.ReadKeywordChars(_input, buffer);
// since keyword has no closing token (as arrays or strings), it might
// happen that we read too many chars... so put that new char as a token on the
// stack and instruct reader that token is already there...
ReadNextToken(char.IsWhiteSpace(_input.CurrentChar));
_getTokenFromStack = true;
string keyword = buffer.ToString().ToLower();
foreach (var k in AvailableKeywords)
{
if (k.Token == keyword)
{
return(_factory.CreateKeyword(k));
}
}
// token has not been found:
throw new JSonReaderException("Unknown keyword", keyword, lastLine, lastOffset);
}
/// <summary>
/// Internal init constuctor.
/// </summary>
internal JSonReaderException(string message, JSonReaderTokenInfo token)
: base(PrepareMessage(message, token))
{
InvalidToken = token != null ? token.Text : string.Empty;
Line = token != null ? token.Line : 0;
Offset = token != null ? token.Offset : 0;
}
private static string PrepareMessage(string message, JSonReaderTokenInfo token)
{
if (token != null)
{
return(PrepareMessage(message, token.Text, token.Line, token.Offset));
}
return(PrepareMessage(message, string.Empty, 0, 0));
}
/// <summary>
/// Read number from an input stream.
/// </summary>
private object ReadNumber()
{
JSonReaderTokenInfo topToken = PopTopToken();
// top token contains the first letter of current number:
StringBuilder buffer = new StringBuilder(topToken.Text);
int numberOffset = _input.LineOffset;
StringHelper.ReadDecimalNumberChars(_input, buffer);
// verify what kind of character is just after the number, if it's a letter then it is an error,
// the only allowed are white-chars and JSON object separators (comma, ']', '}')!
if (!_input.IsEof)
{
if (_input.CurrentChar != ',' && !char.IsWhiteSpace(_input.CurrentChar) && _input.CurrentChar != ']' && _input.CurrentChar != '}')
{
buffer.Append(_input.CurrentChar);
throw new JSonReaderException("Invalid number", buffer.ToString(), _input.Line, numberOffset);
}
}
// since number has no closing token (as arrays or strings), it might
// happen that we read too many chars... so put that new char as a token on the
// stack and instruct reader that token is already there...
ReadNextToken(char.IsWhiteSpace(_input.CurrentChar));
_getTokenFromStack = true;
string number = buffer.ToString();
object result = _factory.CreateNumber(number);
if (result != null)
{
return(result);
}
// number had some invalid format:
throw new JSonReaderException(string.Concat("Invalid number format, value: \"", number, "\", expected format: ", _factory.Format),
number, _input.Line, numberOffset);
}
private static string PrepareMessage(string message, JSonReaderTokenInfo token)
{
if (token != null)
return PrepareMessage(message, token.Text, token.Line, token.Offset);
return PrepareMessage(message, string.Empty, 0, 0);
}
/// <summary>
/// Adds value to the dictionary.
/// </summary>
private static void AddValue(IDictionary<string, object> result, ref string name, object value, ref bool colonSpot, ref bool commaSpot, JSonReaderTokenInfo currentToken)
{
if (!colonSpot)
throw new JSonReaderException("Missing colon between name and value definition", currentToken);
if (!commaSpot && result.Count > 0)
throw new JSonReaderException("Missing comma before name and value definition", currentToken);
if (name == null)
throw new JSonReaderException("Missing value for object element", currentToken);
if (result.ContainsKey(name))
throw new JSonReaderException("Duplicated name in object", currentToken);
result.Add(name, value);
name = null;
colonSpot = false;
commaSpot = false;
}
/// <summary>
/// Adds new element to an array.
/// </summary>
private static void AddValue(ICollection<object> result, object value, int commas, JSonReaderTokenInfo currentToken)
{
if (result.Count != commas)
throw new JSonReaderException("Missing commas between array objects", currentToken);
result.Add(value);
}
/// <summary>
/// Reads next token from the input source with a possibility to treat already known character as the one read.
/// Option required mostly for JSON elements that don't have a closing tokens (i.e.: ']' for arrays) and used for number and keywords.
/// </summary>
private JSonReaderTokenInfo ReadNextToken(bool fromCurrentChar)
{
// token was already read in advanced and put on the stack:
if (_getTokenFromStack)
{
_getTokenFromStack = false;
// reached end of input stream:
if (_input.IsEof)
return new JSonReaderTokenInfo(string.Empty, JSonReaderTokenType.EndOfText, _input.Line, _input.LineOffset);
if (_tokens.Count == 0)
throw new JSonReaderException("Lack of tokens", (JSonReaderTokenInfo)null);
return _tokens.Peek();
}
if (fromCurrentChar)
{
// clear the whitespace characters:
StringHelper.ReadWhiteChars(_input);
}
// reached end of input stream:
if (_input.IsEof)
return new JSonReaderTokenInfo(string.Empty, JSonReaderTokenType.EndOfText, _input.Line, _input.LineOffset);
char tokenChar = _input.CurrentChar;
string tokenString = tokenChar.ToString();
JSonReaderTokenType tokenType = JSonReaderTokenType.Unknown;
// check if this is one of the already known tokens...
foreach (var tokenDef in AvailableTokens)
if (tokenDef.Token == tokenChar)
{
tokenType = tokenDef.Type;
break;
}
// is this the beginning of a keyword?
if (tokenType == JSonReaderTokenType.Unknown && char.IsLetter(tokenChar))
tokenType = JSonReaderTokenType.Keyword;
// is this the beginning of the number?
if (tokenType == JSonReaderTokenType.Unknown && (char.IsDigit(tokenChar) || tokenChar == '-'))
tokenType = JSonReaderTokenType.Number;
// if this is still unknown element...
if (tokenType == JSonReaderTokenType.Unknown)
throw new JSonReaderException("Invalid token found", tokenString, _input.Line, _input.LineOffset);
JSonReaderTokenInfo nextToken = new JSonReaderTokenInfo(tokenString, tokenType, _input.Line, _input.LineOffset);
_tokens.Push(nextToken);
// return it:
return nextToken;
}
/// <summary>
/// Reads a dictonary from an input stream.
/// </summary>
private object ReadObject()
{
Dictionary <string, object> result = new Dictionary <string, object>();
JSonReaderTokenInfo currentToken;
string name = null;
bool colonSpot = false;
bool commaSpot = false;
int commas = 0;
while ((currentToken = ReadNextToken(true)).Type != JSonReaderTokenType.EndOfText)
{
if (currentToken.Type == JSonReaderTokenType.ObjectEnd)
{
PopTopToken();
// if number of commas is greater than number of added elements,
// then value was not passed between:
if (commas > 0 && commas >= result.Count)
{
throw new JSonReaderException("Too many commas at closing object token, expected none", currentToken);
}
break;
}
switch (currentToken.Type)
{
case JSonReaderTokenType.ArrayStart:
// read embedded array:
AddValue(result, ref name, ReadArray(), ref colonSpot, ref commaSpot, currentToken);
break;
case JSonReaderTokenType.ObjectStart:
// read embedded object:
AddValue(result, ref name, ReadObject(), ref colonSpot, ref commaSpot, currentToken);
break;
case JSonReaderTokenType.Keyword:
if (name == null)
{
throw new JSonReaderException("Keyword can not be an object element's name", currentToken);
}
// add embedded value of reserved keyword:
AddValue(result, ref name, ReadKeyword(), ref colonSpot, ref commaSpot, currentToken);
break;
case JSonReaderTokenType.Number:
// add embedded numeric value:
AddValue(result, ref name, ReadNumber(), ref colonSpot, ref commaSpot, currentToken);
break;
case JSonReaderTokenType.String:
if (!commaSpot && result.Count > 0)
{
throw new JSonReaderException("Missing comma before name and value definition", currentToken);
}
if (name == null)
{
name = ReadString().ToString();
if (result.ContainsKey(name))
{
throw new JSonReaderException("Duplicated name in object", currentToken);
}
break;
}
// add embedded string:
AddValue(result, ref name, ReadString(), ref colonSpot, ref commaSpot, currentToken);
break;
case JSonReaderTokenType.Colon:
PopTopToken();
if (colonSpot)
{
throw new JSonReaderException("Duplicated colon found in object", currentToken);
}
if (name == null)
{
throw new JSonReaderException("Unexpected colon, when name not given", currentToken);
}
colonSpot = true;
break;
case JSonReaderTokenType.Comma:
// go to next array element:
currentToken = PopTopToken();
if (commaSpot)
{
throw new JSonReaderException("Two commans in a row", currentToken);
}
commas++;
commaSpot = true;
// if number of commas is greater than number of added elements,
// then value was not passed between:
if (commas > result.Count)
{
throw new JSonReaderException("Missing value for object element", currentToken);
}
break;
default:
throw new JSonReaderException("Invalid token", currentToken);
}
}
JSonReaderTokenInfo topToken = PopTopToken();
if (topToken.Type != JSonReaderTokenType.ObjectStart || currentToken.Type == JSonReaderTokenType.EndOfText)
{
throw new JSonReaderException("Missing close object token", topToken);
}
return(_factory.CreateObject(result));
}
/// <summary>
/// Adds value to the dictionary.
/// </summary>
private static void AddValue(IDictionary <string, object> result, ref string name, object value, ref bool colonSpot, ref bool commaSpot, JSonReaderTokenInfo currentToken)
{
if (!colonSpot)
{
throw new JSonReaderException("Missing colon between name and value definition", currentToken);
}
if (!commaSpot && result.Count > 0)
{
throw new JSonReaderException("Missing comma before name and value definition", currentToken);
}
if (name == null)
{
throw new JSonReaderException("Missing value for object element", currentToken);
}
if (result.ContainsKey(name))
{
throw new JSonReaderException("Duplicated name in object", currentToken);
}
result.Add(name, value);
name = null;
colonSpot = false;
commaSpot = false;
}
/// <summary>
/// Read an array from input stream.
/// </summary>
private object ReadArray()
{
List <object> result = new List <object>();
JSonReaderTokenInfo currentToken;
int commas = 0;
while ((currentToken = ReadNextToken(true)).Type != JSonReaderTokenType.EndOfText)
{
if (currentToken.Type == JSonReaderTokenType.ArrayEnd)
{
PopTopToken();
// if number of commas is greater than number of added elements,
// then value was not passed between:
if (result.Count > 0 && commas != result.Count - 1)
{
throw new JSonReaderException("Too many commas at closing array token, expected none", currentToken);
}
break;
}
switch (currentToken.Type)
{
case JSonReaderTokenType.ArrayStart:
// read embedded array:
AddValue(result, ReadArray(), commas, currentToken);
break;
case JSonReaderTokenType.ObjectStart:
// read embedded object:
AddValue(result, ReadObject(), commas, currentToken);
break;
case JSonReaderTokenType.Keyword:
// add embedded value of reserved keyword:
AddValue(result, ReadKeyword(), commas, currentToken);
break;
case JSonReaderTokenType.Number:
// add embedded numeric value:
AddValue(result, ReadNumber(), commas, currentToken);
break;
case JSonReaderTokenType.String:
// add embedded string value:
AddValue(result, ReadString(), commas, currentToken);
break;
case JSonReaderTokenType.Comma:
// go to next array element:
currentToken = PopTopToken();
commas++;
// if number of commas is greater than number of added elements,
// then value was not passed between:
if (commas > result.Count)
{
throw new JSonReaderException("Missing value for array element", currentToken);
}
break;
default:
throw new JSonReaderException("Invalid token", currentToken);
}
}
JSonReaderTokenInfo topToken = PopTopToken();
if (topToken.Type != JSonReaderTokenType.ArrayStart || currentToken.Type == JSonReaderTokenType.EndOfText)
{
throw new JSonReaderException("Missing close array token", topToken);
}
return(_factory.CreateArray(result));
}
/// <summary>
/// Adds new element to an array.
/// </summary>
private static void AddValue(ICollection <object> result, object value, int commas, JSonReaderTokenInfo currentToken)
{
if (result.Count != commas)
{
throw new JSonReaderException("Missing commas between array objects", currentToken);
}
result.Add(value);
}
/// <summary>
/// Reads next token from the input source with a possibility to treat already known character as the one read.
/// Option required mostly for JSON elements that don't have a closing tokens (i.e.: ']' for arrays) and used for number and keywords.
/// </summary>
private JSonReaderTokenInfo ReadNextToken(bool fromCurrentChar)
{
// token was already read in advanced and put on the stack:
if (_getTokenFromStack)
{
_getTokenFromStack = false;
// reached end of input stream:
if (_input.IsEof)
{
return(new JSonReaderTokenInfo(string.Empty, JSonReaderTokenType.EndOfText, _input.Line, _input.LineOffset));
}
if (_tokens.Count == 0)
{
throw new JSonReaderException("Lack of tokens", (JSonReaderTokenInfo)null);
}
return(_tokens.Peek());
}
if (fromCurrentChar)
{
// clear the whitespace characters:
StringHelper.ReadWhiteChars(_input);
}
// reached end of input stream:
if (_input.IsEof)
{
return(new JSonReaderTokenInfo(string.Empty, JSonReaderTokenType.EndOfText, _input.Line, _input.LineOffset));
}
char tokenChar = _input.CurrentChar;
string tokenString = tokenChar.ToString();
JSonReaderTokenType tokenType = JSonReaderTokenType.Unknown;
// check if this is one of the already known tokens...
foreach (var tokenDef in AvailableTokens)
{
if (tokenDef.Token == tokenChar)
{
tokenType = tokenDef.Type;
break;
}
}
// is this the beginning of a keyword?
if (tokenType == JSonReaderTokenType.Unknown && char.IsLetter(tokenChar))
{
tokenType = JSonReaderTokenType.Keyword;
}
// is this the beginning of the number?
if (tokenType == JSonReaderTokenType.Unknown && (char.IsDigit(tokenChar) || tokenChar == '-'))
{
tokenType = JSonReaderTokenType.Number;
}
// if this is still unknown element...
if (tokenType == JSonReaderTokenType.Unknown)
{
throw new JSonReaderException("Invalid token found", tokenString, _input.Line, _input.LineOffset);
}
JSonReaderTokenInfo nextToken = new JSonReaderTokenInfo(tokenString, tokenType, _input.Line, _input.LineOffset);
_tokens.Push(nextToken);
// return it:
return(nextToken);
}
