public static FJsonNode Parse(string json)
{
FJsonNode context = null;
StringBuilder token = new StringBuilder();
Stack <FJsonNode> stack = new Stack <FJsonNode>();
string tokenName = "";
bool quoteMode = false;
bool tokenIsQuoted = false;
for (int i = 0; i < json.Length; ++i)
{
switch (json[i])
{
case '{':
if (quoteMode)
{
token.Append(json[i]);
break;
}
stack.Push(new FJsonObject());
if (context != null)
{
if (context is FJsonArray jsonArray)
{
jsonArray.Add(stack.Peek());
}
else if (context is FJsonObject jsonObject)
{
jsonObject.Add(tokenName, stack.Peek());
}
}
tokenName = "";
token.Length = 0;
context = stack.Peek();
break;
case '[':
if (quoteMode)
{
token.Append(json[i]);
break;
}
stack.Push(new FJsonArray());
if (context != null)
{
if (context is FJsonArray jsonArray)
{
jsonArray.Add(stack.Peek());
}
else if (context is FJsonObject jsonObject)
{
jsonObject.Add(tokenName, stack.Peek());
}
}
tokenName = "";
token.Length = 0;
context = stack.Peek();
break;
case '}':
case ']':
if (quoteMode)
{
token.Append(json[i]);
break;
}
if (stack.Count == 0)
{
throw new Exception("JSON Parse: Too many closing brackets");
}
stack.Pop();
if (token.Length > 0 || tokenIsQuoted)
{
if (context is FJsonArray jsonArray)
{
jsonArray.Add(ParseElement(token.ToString(), tokenIsQuoted));
}
else if (context is FJsonObject jsonObject)
{
jsonObject.Add(tokenName, ParseElement(token.ToString(), tokenIsQuoted));
}
}
tokenIsQuoted = false;
tokenName = "";
token.Length = 0;
if (stack.Count > 0)
{
context = stack.Peek();
}
break;
case ':':
if (quoteMode)
{
token.Append(json[i]);
break;
}
tokenName = token.ToString();
token.Length = 0;
tokenIsQuoted = false;
break;
case '"':
quoteMode ^= true;
tokenIsQuoted |= quoteMode;
break;
case ',':
if (quoteMode)
{
token.Append(json[i]);
break;
}
if (token.Length > 0 || tokenIsQuoted)
{
if (context is FJsonArray jsonArray)
{
jsonArray.Add(ParseElement(token.ToString(), tokenIsQuoted));
}
else if (context is FJsonObject jsonObject)
{
jsonObject.Add(tokenName, ParseElement(token.ToString(), tokenIsQuoted));
}
}
tokenName = "";
token.Length = 0;
tokenIsQuoted = false;
break;
case '\r':
case '\n':
break;
case ' ':
case '\t':
if (quoteMode)
{
token.Append(json[i]);
}
break;
case '\\':
++i;
if (quoteMode)
{
char C = json[i];
switch (C)
{
case 't':
token.Append('\t');
break;
case 'r':
token.Append('\r');
break;
case 'n':
token.Append('\n');
break;
case 'b':
token.Append('\b');
break;
case 'f':
token.Append('\f');
break;
case 'u':
{
string s = json.Substring(i + 1, 4);
token.Append((char)int.Parse(
s,
System.Globalization.NumberStyles.AllowHexSpecifier));
i += 4;
break;
}
default:
token.Append(C);
break;
}
}
break;
case '/':
if (!quoteMode && i + 1 < json.Length && json[i + 1] == '/')
{
while (++i < json.Length && json[i] != '\n' && json[i] != '\r')
{
;
}
break;
}
token.Append(json[i]);
break;
case '\uFEFF': // remove / ignore BOM (Byte Order Mark)
break;
default:
token.Append(json[i]);
break;
}
}
if (quoteMode)
{
throw new Exception("JSON Parse: Quotation marks seems to be messed up.");
}
if (context == null)
{
return(ParseElement(token.ToString(), tokenIsQuoted));
}
return(context);
}
public void Add(FJsonNode node)
{
_list.Add(node);
}
