public IEnumerable <IJSONToken> Tokenize(string s)
{
this.input = s;
this.index = 0;
this.handled = true;
IJSONToken token = this.GetToken();
while (token.Kind != JSONTokenType.EOF)
{
yield return(token);
token = this.GetToken();
}
yield return(token);
}
private IJSONToken GetToken()
{
Queue <char> for_string = new Queue <char>();
IJSONToken token = null;
bool found_decimal = false;
int start = this.index;
State current_state = State.unknown;
State next_state = State.unknown;
while (current_state != State.done)
{
current_state = next_state;
if (this.handled)
{
this.CH_current = this.Get();
this.handled = false;
}
switch (current_state)
{
case State.done: break; // nothing to do here
case State.unknown:
if (this.CH_current.EOF)
{
next_state = State.eof;
}
else
{
switch (this.CH_current.C)
{
case '{': next_state = State.open_curly; break;
case '}': next_state = State.close_curly; break;
case '[': next_state = State.open_bracket; break;
case ']': next_state = State.close_bracket; break;
case ',': next_state = State.comma; break;
case ':': next_state = State.colon; break;
case ';': next_state = State.semi_colon; break;
case '"': next_state = State.start_quote; break;
case '.': next_state = State.start_number; break;
case '-': next_state = State.start_number; break;
default:
if ((this.CH_current.C >= '0') && (this.CH_current.C <= '9'))
{
next_state = State.at_least_a_digit;
}
else if ((this.CH_current.C >= 'a') && (this.CH_current.C <= 'z'))
{
next_state = State.start_string;
}
else if ((this.CH_current.C >= 'A') && (this.CH_current.C <= 'Z'))
{
next_state = State.start_string;
}
else
{
handled = true;
} break; // ignore unknown
}
}
break;
case State.eof:
token = new JSONToken(JSONTokenType.EOF, "~");
this.handled = false;
next_state = State.done;
break;
case State.open_curly:
token = new JSONToken(JSONTokenType.OpenCurly, "{");
this.handled = true;
next_state = State.done;
break;
case State.close_curly:
token = new JSONToken(JSONTokenType.CloseCurly, "}");
this.handled = true;
next_state = State.done;
break;
case State.open_bracket:
token = new JSONToken(JSONTokenType.OpenBracket, "[");
this.handled = true;
next_state = State.done;
break;
case State.close_bracket:
token = new JSONToken(JSONTokenType.CloseBracket, "]");
this.handled = true;
next_state = State.done;
break;
case State.comma:
token = new JSONToken(JSONTokenType.Comma, ",");
this.handled = true;
next_state = State.done;
break;
case State.semi_colon:
token = new JSONToken(JSONTokenType.Semicolon, ";");
this.handled = true;
next_state = State.done;
break;
case State.colon:
token = new JSONToken(JSONTokenType.Colon, ":");
this.handled = true;
next_state = State.done;
break;
case State.start_quote:
for_string.Clear();
//for_string.Enqueue('"');
this.handled = true;
next_state = State.in_quote;
break;
case State.in_quote:
if ('"' == this.CH_current.C)
{
string sTemp = String.Empty;
foreach (char c in for_string)
{
sTemp += c.ToString();
}
token = new JSONToken(JSONTokenType.QuotedString, sTemp);
next_state = State.done;
}
else
{
for_string.Enqueue(this.CH_current.C);
}
this.handled = true;
break;
case State.start_single_quote:
for_string.Clear();
this.handled = true;
next_state = State.in_single_quote;
break;
case State.in_single_quote:
if ('\'' == this.CH_current.C)
{
string sTemp = String.Empty;
foreach (char c in for_string)
{
sTemp += c.ToString();
}
token = new JSONToken(JSONTokenType.QuotedString, sTemp);
next_state = State.done;
}
else
{
for_string.Enqueue(this.CH_current.C);
}
this.handled = true;
break;
case State.start_string:
for_string.Clear();
for_string.Enqueue(this.CH_current.C);
this.handled = true;
next_state = State.in_string;
break;
case State.in_string:
bool still = ((this.CH_current.C >= 'a') && (this.CH_current.C <= 'z'));
still = still || ((this.CH_current.C >= 'A') && (this.CH_current.C <= 'Z'));
still = still || ((this.CH_current.C >= '0') && (this.CH_current.C <= '9'));
if (still)
{
for_string.Enqueue(this.CH_current.C);
handled = true;
}
else
{
string sTemp = String.Empty;
foreach (char c in for_string)
{
sTemp += c.ToString();
}
token = new JSONToken(JSONTokenType.UnquotedString, sTemp);
next_state = State.done;
}
break;
case State.start_number: // handle - and .
if (this.CH_current.C == '.')
{
found_decimal = true;
}
for_string.Clear();
for_string.Enqueue(this.CH_current.C);
this.handled = true;
next_state = State.at_least_a_digit;
break;
case State.at_least_a_digit:
if ((this.CH_current.C < '0') || ('9' < this.CH_current.C))
{
throw new ParseException("got a - without a folloing digit");
}
this.handled = false;
next_state = State.in_number;
break;
case State.in_number:
if ((this.CH_current.C == '.') && (found_decimal))
{
throw new ParseException("string contains two decimal point in number");
}
if (this.CH_current.C == '.')
{
found_decimal = true;
this.handled = true;
for_string.Enqueue(this.CH_current.C);
}
else
{
if ((this.CH_current.C >= '0') && (this.CH_current.C <= '9'))
{
this.handled = true;
for_string.Enqueue(this.CH_current.C);
}
else
{
string sTemp = String.Empty;
foreach (char c in for_string)
{
sTemp += c.ToString();
}
token = new JSONToken(JSONTokenType.Number, sTemp);
next_state = State.done;
}
}
break;
}
}
return(token);
}
