public static ParseResult <JObject> ParseFirstObject(Substring encoded)
{
int i = LeadingWhiteSpaceCount(encoded);
if (encoded[i] != '{')
{
throw new System.ArgumentException("Failed to parse JSON Object: " + encoded.ToString());
}
i++;
JObject json = new JObject();
i += LeadingWhiteSpaceCount(encoded.SubSubstring(i));
while (encoded[i] != '}')
{
if (i >= encoded.Length)
{
throw new System.ArgumentException("Unterminated object: " + encoded.ToString());
}
i += LeadingWhiteSpaceCount(encoded.SubSubstring(i));
var keyResult = ParseFirstString(encoded.SubSubstring(i));
i += keyResult.SubstringLength;
i += LeadingWhiteSpaceCount(encoded.SubSubstring(i));
if (encoded[i] != ':')
{
throw new System.ArgumentException("Missing colon when parsing object property: " + encoded.ToString());
}
else
{
i++;
}
i += LeadingWhiteSpaceCount(encoded.SubSubstring(i));
var valueResult = ParseFirstToken(encoded.SubSubstring(i));
i += valueResult.SubstringLength;
i += LeadingWhiteSpaceCount(encoded.SubSubstring(i));
json[keyResult.Token.ToString()] = valueResult.Token;
if (encoded[i] != ',')
{
if (encoded[i] != '}')
{
throw new System.ArgumentException("Unable to parse JSON object: " + encoded.ToString());
}
}
else
{
i++;
}
}
return(new ParseResult <JObject> {
Token = json,
SubstringLength = i + 1
});
}
private static int LeadingWhiteSpaceCount(Substring s)
{
int count = 0;
while (IsWhiteSpace(s[count]))
{
count++;
}
return(count);
}
public static ParseResult <JArray> ParseFirstArray(Substring encoded)
{
int i = LeadingWhiteSpaceCount(encoded);
if (encoded[i] != '[')
{
throw new System.ArgumentException("No array found: " + encoded.ToString());
}
i++;
List <JToken> items = new List <JToken>();
i += LeadingWhiteSpaceCount(encoded.SubSubstring(i));
while (encoded[i] != ']')
{
if (i >= encoded.Length)
{
throw new System.ArgumentException("Unterminated array: " + encoded.ToString());
}
i += LeadingWhiteSpaceCount(encoded.SubSubstring(i));
var result = ParseFirstToken(encoded.SubSubstring(i));
items.Add(result.Token);
i += result.SubstringLength;
i += LeadingWhiteSpaceCount(encoded.SubSubstring(i));
if (encoded[i] != ',')
{
if (encoded[i] != ']')
{
throw new System.Exception("Unable to parse array: " + encoded.ToString());
}
}
else
{
i++;
}
}
return(new ParseResult <JArray> {
Token = new JArray(items.ToArray()),
SubstringLength = i + 1
});
}
public static ParseResult <JString> ParseFirstString(Substring encoded)
{
int i = LeadingWhiteSpaceCount(encoded);
if (encoded[i] != '"')
{
throw new System.ArgumentException("No string found!");
}
i++;
int stringStart = i;
bool inEscape = false;
while (i < encoded.Length)
{
char c = encoded[i];
if (inEscape)
{
// Skip the next character
inEscape = false;
}
else if (c == '"')
{
return(new ParseResult <JString> {
Token = new JString(encoded.SubSubstring(stringStart, i - stringStart)),
SubstringLength = i + 1
});
}
else if (c == '\\')
{
inEscape = true;
}
i++;
}
throw new System.ArgumentException("Non-terminated string");
}
public static ParseResult <JNumber> ParseFirstNumber(Substring encoded)
{
int i = LeadingWhiteSpaceCount(encoded);
int numberStart = i;
if (encoded[i] == '-')
{
i++;
}
else if (!IsDigit(encoded[i]))
{
throw new System.ArgumentException("No number found!");
}
bool inFraction = false;
bool inExponent = false;
bool digitRead = false;
bool fractionDigitRead = false;
bool exponentDigitRead = false;
while (i < encoded.Length)
{
char c = encoded[i];
if (IsDigit(c))
{
i++;
digitRead = true;
if (inFraction)
{
fractionDigitRead = true;
}
if (inExponent)
{
exponentDigitRead = true;
}
continue;
}
else if (!inExponent && !inFraction && digitRead && c == '.')
{
inFraction = true;
}
else if (c == 'E' || c == 'e')
{
inFraction = false;
inExponent = true;
}
else if (inExponent && !exponentDigitRead && (c == '+' | c == '-'))
{
i++;
continue;
}
else
{
// We read something other than a valid character for a number
break;
}
i++;
}
if (!digitRead)
{
throw new System.ArgumentException("No digits found! " + encoded.ToString());
}
if (inFraction && !fractionDigitRead)
{
throw new System.ArgumentException("Fraction not terminated " + encoded.ToString());
}
if (inExponent && !exponentDigitRead)
{
throw new System.ArgumentException("Exponent not terminated " + encoded.ToString());
}
JNumber token = null;
string numberAsString = encoded.SubSubstring(numberStart, i - numberStart).ToString();
if (fractionDigitRead || exponentDigitRead)
{
float result;
var style = System.Globalization.NumberStyles.Float;
var culture = System.Globalization.CultureInfo.CreateSpecificCulture("en-US");
if (!float.TryParse(numberAsString, style, culture, out result))
{
throw new System.ArgumentException("Unable to parse number from JSON: " + encoded.ToString());
}
token = new JNumber(result);
}
else
{
int result;
if (!int.TryParse(numberAsString, out result))
{
throw new System.ArgumentException("Unable to parse number from JSON: " + encoded.ToString());
}
token = new JNumber(result);
}
return(new ParseResult <JNumber> {
Token = token,
SubstringLength = i
});
}
public static ParseResult <JToken> ParseFirstToken(Substring encoded)
{
JToken token = null;
int substringLength = 0;
int i = 0;
while (i < encoded.Length)
{
char c = encoded[i];
if (IsWhiteSpace(c))
{
i++;
}
else if (c == '{')
{
// Beginning of JSON
var json = ParseFirstObject(encoded.SubSubstring(i));
token = json.Token;
substringLength = json.SubstringLength;
break;
}
else if (c == '"')
{
var jString = ParseFirstString(encoded.SubSubstring(i));
token = jString.Token;
substringLength = jString.SubstringLength;
break;
}
else if (c == '-' || IsDigit(c))
{
var jNumber = ParseFirstNumber(encoded.SubSubstring(i));
token = jNumber.Token;
substringLength = jNumber.SubstringLength;
break;
}
else if (c == '[')
{
var jArray = ParseFirstArray(encoded.SubSubstring(i));
token = jArray.Token;
substringLength = jArray.SubstringLength;
break;
}
else if (c == 't')
{
if (encoded[i + 1] == 'r' &&
encoded[i + 2] == 'u' &&
encoded[i + 3] == 'e')
{
token = new JBoolean(true);
substringLength = 4;
break;
}
}
else if (c == 'f')
{
if (encoded[i + 1] == 'a' &&
encoded[i + 2] == 'l' &&
encoded[i + 3] == 's' &&
encoded[i + 4] == 'e')
{
token = new JBoolean(false);
substringLength = 5;
break;
}
}
else if (c == 'n')
{
if (encoded[i + 1] == 'u' &&
encoded[i + 2] == 'l' &&
encoded[i + 3] == 'l')
{
token = new JNull();
substringLength = 4;
break;
}
}
else
{
throw new System.ArgumentException("Invalid JSON");
}
i++;
}
return(new ParseResult <JToken> {
Token = token,
SubstringLength = substringLength
});
}
public JString(string value)
{
this.value = value;
}
internal JString(Substring value)
{
this.value = value;
}
