Method populateErrorDetails

postgres/parser/parser/lexer.go:219–254

()

}

func (l *lexer) populateErrorDetails() {
	lastTok := l.lastToken()

	if lastTok.id == ERROR {
		// This is a tokenizer (lexical) error: the scanner
		// will have stored the error message in the string field.
		err := pgerror.WithCandidateCode(errors.Newf("lexical error: %s", lastTok.str), pgcode.Syntax)
		l.lastError = errors.WithSecondaryError(err, l.lastError)
	} else {
		// This is a contextual error. Print the provided error message
		// and the error context.
		if !strings.Contains(l.lastError.Error(), "syntax error") {
			// "syntax error" is already prepended when the yacc-generated
			// parser encounters a parsing error.
			l.lastError = errors.Wrap(l.lastError, "syntax error")
		}
		l.lastError = errors.Wrapf(l.lastError, "at or near \"%s\"", lastTok.str)
	}

	// Find the end of the line containing the last token.
	i := strings.IndexByte(l.in[lastTok.pos:], '\n')
	if i == -1 {
		i = len(l.in)
	} else {
		i += int(lastTok.pos)
	}
	// Find the beginning of the line containing the last token. Note that
	// LastIndexByte returns -1 if '\n' could not be found.
	j := strings.LastIndexByte(l.in[:lastTok.pos], '\n') + 1
	// Output everything up to and including the line containing the last token.
	var buf bytes.Buffer
	fmt.Fprintf(&buf, "source SQL:\n%s\n", l.in[:i])
	// Output a caret indicating where the last token starts.
	fmt.Fprintf(&buf, "%s^", strings.Repeat(" ", int(lastTok.pos)-j))
	l.lastError = errors.WithDetail(l.lastError, buf.String())
}

// SetHelp marks the "last error" field in the lexer to become a
// help text. This method is invoked in the error action of the