Example #1
0
// If the next token is a keyword with the given value, return that token after
// advancing the parser. Otherwise, do not change the parser state and return false.
func expectKeyWord(parser *Parser, value string) (lexer.Token, error) {
	token := parser.Token
	if token.Kind == lexer.TokenKind[lexer.NAME] && token.Value == value {
		advance(parser)
		return token, nil
	}
	descp := fmt.Sprintf("Expected \"%s\", found %s", value, lexer.GetTokenDesc(token))
	return token, gqlerrors.NewSyntaxError(parser.Source, token.Start, descp)
}
Example #2
0
// If the next token is of the given kind, return that token after advancing
// the parser. Otherwise, do not change the parser state and return false.
func expect(parser *Parser, kind int) (lexer.Token, error) {
	token := parser.Token
	if token.Kind == kind {
		advance(parser)
		return token, nil
	}
	descp := fmt.Sprintf("Expected %s, found %s", lexer.GetTokenKindDesc(kind), lexer.GetTokenDesc(token))
	return token, gqlerrors.NewSyntaxError(parser.Source, token.Start, descp)
}
Example #3
0
// Helper function for creating an error when an unexpected lexed token
// is encountered.
func unexpected(parser *Parser, atToken lexer.Token) error {
	var token lexer.Token
	if (atToken == lexer.Token{}) {
		token = parser.Token
	} else {
		token = parser.Token
	}
	description := fmt.Sprintf("Unexpected %v", lexer.GetTokenDesc(token))
	return gqlerrors.NewSyntaxError(parser.Source, token.Start, description)
}