private JsonValue ParseObject(ICharReader charReader)
{
var members = new List <JsonObjectMember>();
if (!charReader.TrimRead('{'))
{
throw new JsonException("Expected '{' when parsing json object.");
}
var peek = charReader.TrimThenPeek();
if (!peek.HasValue)
{
throw new JsonException("Unterminated object");
}
while (peek.Value != '}')
{
if (members.Any())
{
if (!charReader.TrimRead(','))
{
throw new JsonException("Missing comma separater between array items.");
}
}
members.Add(ParseObjectMember(charReader));
peek = charReader.TrimThenPeek();
if (!peek.HasValue)
{
throw new JsonException("Unterminated object");
}
}
charReader.Read(); // }
return(new JsonObject(members));
}
private JsonValue ParseArray(ICharReader charReader)
{
charReader.TrimRead(); // [
var items = new List <JsonValue>();
while (charReader.TrimThenPeek() != ']')
{
if (items.Any())
{
if (!charReader.TrimRead(','))
{
throw new JsonException("Missing comma separater between array items.");
}
}
items.Add(ParseJsonValue(charReader));
}
charReader.Read(); // ]
return(new JsonArray(items));
}
private JsonObjectMember ParseObjectMember(ICharReader charReader)
{
var name = ParseString(charReader);
if (!charReader.TrimRead(':'))
{
throw new JsonException("expected ':' after member name.");
}
var value = ParseJsonValue(charReader);
return(new JsonObjectMember(name.Value, value));
}
private JsonString ParseString(ICharReader charReader)
{
var delimiter = charReader.TrimRead();
if (delimiter != '\'' && delimiter != '"')
{
throw new JsonException("Strings must be delimiated with either single or double quotes");
}
var sb = new StringBuilder();
var c = GetNextStringCharacter(charReader, delimiter);
while (c.HasValue)
{
sb.Append(c);
c = GetNextStringCharacter(charReader, delimiter);
}
return(new JsonString(sb.ToString()));
}