// 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 {
err := advance(parser)
return token, err
}
descp := fmt.Sprintf("Expected \"%s\", found %s", value, lexer.GetTokenDesc(token))
return token, gqlerrors.NewSyntaxError(parser.Source, token.Start, descp)
}
// 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 {
err := advance(parser)
return token, err
}
descp := fmt.Sprintf("Expected %s, found %s", lexer.GetTokenKindDesc(kind), lexer.GetTokenDesc(token))
return token, gqlerrors.NewSyntaxError(parser.Source, token.Start, descp)
}
// 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)
}