static void CheckEndOfExpression(SLJsonTokenizer tokenizer)
{
if (tokenizer.TryReadNext())
{
ThrowUnexpected(tokenizer);
}
}
static SLJsonNode ParseArray(SLJsonTokenizer tokenizer)
{
var res = new SLJsonNode();
res.MakeArray();
bool needSep = false;
while (true)
{
tokenizer.ReadNext();
if (tokenizer.SpecialChar == ']')
{
return(res);
}
if (needSep)
{
if (tokenizer.SpecialChar != ',')
{
throw new SLJsonException("Separator expected");
}
tokenizer.ReadNext();
}
SLJsonNode value = ParseValue(tokenizer);
res.m_Array.Add(value);
value.AssignParent(res);
needSep = true;
}
}
static void ThrowUnexpected(SLJsonTokenizer tokenizer)
{
if (tokenizer.HasSpecialChar)
{
throw new SLJsonException("Unexpected special character: " + tokenizer.SpecialChar.ToString());
}
throw new SLJsonException((tokenizer.TokenIsString ? "Unexpected string: " : "Unexpected token: ") + tokenizer.Token);
}
SLJsonNode ParseObject(SLJsonTokenizer tokenizer)
{
var res = new SLJsonNode();
res.MakeObject();
bool needSep = false;
while (true)
{
tokenizer.ReadNext();
if (tokenizer.SpecialChar == '}')
{
return(res);
}
if (needSep)
{
if (tokenizer.SpecialChar != ',')
{
throw new SLJsonException("Separator expected");
}
tokenizer.ReadNext();
}
if (tokenizer.HasSpecialChar)
{
throw new SLJsonException("Unexpected token");
}
if (!AreUnquotedNamesAllowed && !tokenizer.TokenIsString)
{
throw new SLJsonException("String expected");
}
string field = tokenizer.Token;
tokenizer.ReadNext();
if (tokenizer.SpecialChar != ':')
{
throw new SLJsonException("Colon expected");
}
tokenizer.ReadNext();
SLJsonNode value = ParseValue(tokenizer);
res.m_Object[field] = value; // No exception for multiple fields with the same name
value.AssignParent(res);
needSep = true;
}
}
SLJsonNode ParseValue(SLJsonTokenizer tokenizer)
{
if (tokenizer.HasSpecialChar)
{
switch (tokenizer.SpecialChar)
{
case '{': return(ParseObject(tokenizer));
case '[': return(ParseArray(tokenizer));
default: throw new SLJsonException("Unexpected token: " + tokenizer.SpecialChar.ToString());
}
}
if (tokenizer.TokenIsString)
{
return(new SLJsonNode(SLJsonNodeType.String, tokenizer.Token));
}
string t = tokenizer.Token;
switch (t)
{
case "null":
return(new SLJsonNode(SLJsonNodeType.Null, null));
case "false":
case "true":
return(new SLJsonNode(SLJsonNodeType.Boolean, t));
default:
if (!IsNumericCheckDisabled)
{
double d;
if (!SLJsonConvert.TryParse(t, out d))
{
throw new SLJsonException("Numeric value expected");
}
t = SLJsonConvert.ToString(d); // Normalize numeric value
}
return(new SLJsonNode(SLJsonNodeType.Number, t));
}
}
SLJsonNode ParseRoot(string jsonExpression, bool allowArraysAndValues)
{
var tokenizer = new SLJsonTokenizer(jsonExpression);
tokenizer.AreSingleQuotesEnabled = AreSingleQuotesAllowed;
try
{
tokenizer.ReadNext();
SLJsonNode res;
if (allowArraysAndValues)
{
res = ParseValue(tokenizer);
}
else
{
if (!tokenizer.HasSpecialChar || tokenizer.SpecialChar != '{')
{
ThrowUnexpected(tokenizer);
}
res = ParseObject(tokenizer);
}
CheckEndOfExpression(tokenizer);
return(res);
}
catch (SLJsonException e)
{
throw new SLJsonException(
"Syntax error in JSON expression at row " +
SLJsonConvert.ToString(tokenizer.CurrentRow) + " in column " +
SLJsonConvert.ToString(tokenizer.CurrentColumn) + ": " +
e.Message,
e);
}
}
