private Expression ParseRightSide()
{
var left = ParseExpression();
AdvanceWhile(e => e.Current.Type == TokenType.Whitespace);
if (!_enumerator.Moved || _enumerator.Current.Value.In(",", "]", ";", ")"))
{
return(left);
}
if (_enumerator.Current.Value == "+")
{
Advance();
AdvanceWhile(e => e.Current.Type == TokenType.Whitespace);
var right = ParseRightSide();
var result = CustomExpression.Concat(left, right);
return(result);
}
throw new RecipeCompilerException(_enumerator.Current.Position, $"Unexpected token '{_enumerator.Current.Value}'");
}
private Expression ParseLeftSide()
{
if (!_enumerator.Current.LooksLikeFilePath())
{
throw new RecipeCompilerException(_enumerator.Current.Position, $"Output cannot start with '{_enumerator.Current.Value}'");
}
var value = ReadWhile(e => e.Current.Type.In(TokenType.String) || e.Current.Value == ".");
var left = _variables.ContainsKey(value) ? (Expression)_variables[value] : Expression.Constant(value);
AdvanceWhile(e => e.Current.Type == TokenType.Whitespace);
if (_enumerator.Current.Value == "+")
{
Advance();
AdvanceWhile(e => e.Current.Type == TokenType.Whitespace);
return(CustomExpression.Concat(left, ParseLeftSide()));
}
return(left);
}