Method PushBack

pkg/sql/plpgsql/parser/lexer.go:538–551

PushBack rewinds the lexer by n tokens.

(n int)

// PushBack rewinds the lexer by n tokens.
func (l *lexer) PushBack(n int) {
	if n < 0 {
		panic(errors.AssertionFailedf("negative n provided to PushBack"))
	}
	l.lastPos -= n
	if l.lastPos < -1 {
		// Return to the initialized state.
		l.lastPos = -1
	}
	if n >= 1 {
		// Invalidate the parser lookahead token.
		l.parser.(*plpgsqlParserImpl).char = -1
	}
}

// Advance advances the lexer by n tokens.
func (l *lexer) Advance(n int) {