/// <summary>
/// Path for loading a JSON array
/// </summary>
/// <param name="json"></param>
private void LoadArrayString(List <object> list, string json)
{
if (string.IsNullOrEmpty(json) || !ValueIsArray(json))
{
return;
}
int startBracketPos = json.IndexOf("[");
int endBracketPos = json.LastIndexOf("]");
json = json.Substring(startBracketPos + 1, endBracketPos - startBracketPos - 1);
//walk the string
JsonTracePos tracePos = new JsonTracePos();
for (tracePos.CurrentPos = 0; tracePos.CurrentPos < json.Length; tracePos.CurrentPos++)
{
AppendCurrentCharToTrace(json, tracePos, false, null, list);
}
//look to flush final unquoted value
if (tracePos.InValue && tracePos.InUnQuotedValue)
{
string val = tracePos.FlushBuffer();
list.Add(GetResolvedValue(val));
}
else if (tracePos.InKey || tracePos.InValue)
{
throw new Exception("Malformed JSON data");
}
}
/// <summary>
/// Path for loading a JSON object
/// </summary>
/// <param name="dictionary"></param>
/// <param name="json"></param>
private void LoadObjectString(Dictionary <string, object> dictionary, string json)
{
if (string.IsNullOrEmpty(json) || !ValueIsObject(json))
{
return;
}
int startBracketPos = json.IndexOf("{");
int endBracketPos = json.LastIndexOf("}");
json = json.Substring(startBracketPos + 1, endBracketPos - startBracketPos - 1);
//walk the string
JsonTracePos tracePos = new JsonTracePos();
for (tracePos.CurrentPos = 0; tracePos.CurrentPos < json.Length; tracePos.CurrentPos++)
{
AppendCurrentCharToTrace(json, tracePos, true, dictionary, null);
}
//look to flush final unquoted value
if (tracePos.InValue && tracePos.InUnQuotedValue && tracePos.PreviousKey != null)
{
string val = tracePos.FlushBuffer();
dictionary[tracePos.PreviousKey] = GetResolvedValue(val);
}
else if (tracePos.InKey || tracePos.InValue)
{
throw new Exception("Malformed JSON data");
}
}
/// <summary>
/// Appends the next character to the trace
/// </summary>
/// <param name="json"></param>
/// <param name="tracePos"></param>
/// <param name="isObject"></param>
private void AppendCurrentCharToTrace(string json, JsonTracePos tracePos, bool isObject, Dictionary <string, object> dictionaryForObject, List <object> listForArray)
{
char curChar = json[tracePos.CurrentPos];
if ((!isObject && !tracePos.InValue) ||
(isObject && !tracePos.InKey && !tracePos.InValue))
{
if ((isObject && curChar == ':') || curChar == ',' || curChar == '\t' ||
curChar == '\n' || curChar == '\r' ||
curChar == ' ')
{
return;
}
if (isObject)
{
if (tracePos.PreviousKey != null)
{
if (IsCurrentCharObjectStart(curChar))
{
//recurse and add object result
//char matchChar = '\0';
//if (curChar == '{') matchChar = '}';
//else if (curChar == '[') matchChar = ']';
int embeddedObjectEndPos = FindMatchedCloseCharPosition(json, tracePos.CurrentPos);
if (embeddedObjectEndPos == -1)
{
throw new Exception("Malformed JSON data");
}
//todo - walk backwards to identify correct delimiter
string embeddedJson = json.Substring(tracePos.CurrentPos, (embeddedObjectEndPos - tracePos.CurrentPos) + 1);
dictionaryForObject[tracePos.PreviousKey] = GetResolvedValue(embeddedJson);
tracePos.CurrentPos = embeddedObjectEndPos + 1;
tracePos.PreviousKey = null;
tracePos.ClearContext();
return;
}
else if (!IsCurrentCharQuote(curChar, '\0'))
{
tracePos.InValue = true;
tracePos.InUnQuotedValue = true;
tracePos.AppendChar(curChar);
return;
}
}
else if (!IsCurrentCharQuote(curChar, tracePos.QuoteChar))
{
//in unquoted key
tracePos.InKey = true;
tracePos.InUnQuotedKey = true;
tracePos.AppendChar(curChar);
return;
}
}
//array branch
else
{
if (IsCurrentCharObjectStart(curChar))
{
//recurse and add object result
//char matchChar = '\0';
//if (curChar == '{') matchChar = '}';
//else if (curChar == '[') matchChar = ']';
int embeddedObjectEndPos = FindMatchedCloseCharPosition(json, tracePos.CurrentPos);
if (embeddedObjectEndPos == -1)
{
throw new Exception("Malformed JSON data");
}
string embeddedJson = json.Substring(tracePos.CurrentPos, (embeddedObjectEndPos - tracePos.CurrentPos) + 1);
listForArray.Add(GetResolvedValue(embeddedJson));
tracePos.CurrentPos = embeddedObjectEndPos + 1;
tracePos.ClearContext();
return;
}
else if (!IsCurrentCharQuote(curChar, '\0'))
{
tracePos.InValue = true;
tracePos.InUnQuotedValue = true;
tracePos.AppendChar(curChar);
return;
}
}
}
if (curChar == '\\' && !tracePos.AfterEscapeChar)
{
tracePos.AfterEscapeChar = true;
return;
}
if (!tracePos.AfterEscapeChar && IsCurrentCharQuote(curChar, tracePos.QuoteChar))
{
if ((!isObject && !tracePos.InValue) ||
(isObject && !tracePos.InKey && !tracePos.InValue))
{
tracePos.QuoteChar = curChar;
if (isObject)
{
if (tracePos.PreviousKey == null)
{
tracePos.InKey = true;
}
else
{
tracePos.InValue = true;
}
}
else
{
tracePos.InValue = true;
}
}
else
{
tracePos.QuoteChar = '\0';
if (isObject)
{
if (tracePos.InKey)
{
tracePos.PreviousKey = tracePos.FlushBuffer();
tracePos.InKey = false;
}
else
{
string val = tracePos.FlushBuffer();
//resolve if array or object
dictionaryForObject[tracePos.PreviousKey] = GetResolvedValue(val);
tracePos.ClearContext();
tracePos.PreviousKey = null;
}
}
else
{
tracePos.QuoteChar = '\0';
string val = tracePos.FlushBuffer();
//resolve if array or object
listForArray.Add(GetResolvedValue(val));
tracePos.ClearContext();
}
}
return;
}
else
{
if (tracePos.InValue && tracePos.InUnQuotedValue && curChar == ',')
{
string val = tracePos.FlushBuffer();
//resolve if array or object
if (isObject)
{
dictionaryForObject[tracePos.PreviousKey] = GetResolvedValue(val);
}
else
{
listForArray.Add(GetResolvedValue(val));
}
tracePos.InValue = false;
tracePos.InUnQuotedValue = false;
tracePos.PreviousKey = null;
return;
}
else if (isObject && (tracePos.InKey && tracePos.InUnQuotedKey &&
(curChar == ' ' || curChar == ':' || curChar == '\t' ||
curChar == '\n' || curChar == '\r')))
{
string val = tracePos.FlushBuffer();
tracePos.PreviousKey = val;
tracePos.InUnQuotedKey = false;
tracePos.InKey = false;
return;
}
else
{
if (tracePos.AfterEscapeChar)
{
switch (curChar)
{
case '\'':
case '"':
tracePos.AppendChar(curChar);
break;
case 'n':
tracePos.AppendChar('\n');
break;
case 'r':
tracePos.AppendChar('\r');
break;
case 't':
tracePos.AppendChar('\t');
break;
case 'f':
tracePos.AppendChar('\f');
break;
case '\r':
//check for windows \r\n combo by peeking ahead
if (json.Length > tracePos.CurrentPos + 1 &&
'\n' == json[tracePos.CurrentPos + 1])
{
//advance past linefeed
tracePos.CurrentPos++;
}
break;
case '\n':
break;
default:
tracePos.AppendChar(curChar);
break;
}
}
else
{
tracePos.AppendChar(curChar);
}
}
if (tracePos.AfterEscapeChar)
{
tracePos.AfterEscapeChar = false;
}
}
}
