/// <summary>
/// Retrieves the next value token from the tokenizer and appends it
/// to the supplied element <paramref name="owner"/>.
/// </summary>
/// <param name="owner">The element to append the next token.</param>
/// <exception cref="System.Exception">End of file reached while trying to read a value</exception>
private HoconValue ParseValue(IHoconElement owner)
{
var value = new HoconValue(owner);
var parsing = true;
while (parsing)
{
switch (_tokens.Current.Type)
{
case TokenType.Include:
value.Add(ParseInclude(value));
break;
case TokenType.LiteralValue:
// Consume leading whitespaces.
if (_tokens.Current.IsNonSignificant())
{
ConsumeWhitespace();
}
if (_tokens.Current.Type != TokenType.LiteralValue)
{
break;
}
while (_tokens.Current.Type == TokenType.LiteralValue)
{
value.Add(HoconLiteral.Create(value, _tokens.Current));
_tokens.Next();
}
break;
case TokenType.StartOfObject:
value.Add(ParseObject(value));
break;
case TokenType.StartOfArray:
value.Add(ParseArray(value));
break;
case TokenType.SubstituteOptional:
case TokenType.SubstituteRequired:
var pointerPath = HoconPath.Parse(_tokens.Current.Value);
HoconSubstitution sub = new HoconSubstitution(value, pointerPath, _tokens.Current,
_tokens.Current.Type == TokenType.SubstituteRequired);
_substitutions.Add(sub);
value.Add(sub);
_tokens.Next();
break;
case TokenType.EndOfObject:
case TokenType.EndOfArray:
parsing = false;
break;
// comments automatically stop value parsing.
case TokenType.Comment:
ConsumeWhitelines();
parsing = false;
break;
case TokenType.EndOfLine:
parsing = false;
break;
case TokenType.EndOfFile:
case TokenType.Comma:
parsing = false;
break;
case TokenType.PlusEqualAssign:
HoconSubstitution subAssign = new HoconSubstitution(value, new HoconPath(Path), _tokens.Current, false);
_substitutions.Add(subAssign);
value.Add(subAssign);
value.Add(ParsePlusEqualAssignArray(value));
parsing = false;
break;
case TokenType.Assign:
ConsumeWhitelines();
break;
default:
throw HoconParserException.Create(_tokens.Current, Path,
$"Failed to parse Hocon value. Unexpected token: `{_tokens.Current.Type}`");
}
}
// trim trailing whitespace if result is a literal
if (value.Type == HoconType.Literal)
{
if (value[value.Count - 1] is HoconWhitespace)
{
value.RemoveAt(value.Count - 1);
}
}
return(value);
}