Function Fold

postgres/parser/pretty/util.go:139–148

Fold applies f recursively to all Docs in d.

(f func(a, b Doc) Doc, d ...Doc)

// Fold applies f recursively to all Docs in d.
func Fold(f func(a, b Doc) Doc, d ...Doc) Doc {
	switch len(d) {
	case 0:
		return Nil
	case 1:
		return d[0]
	default:
		return f(d[0], Fold(f, d[1:]...))
	}
}

// FoldMap applies f recursively to all Docs in d processed through g.
func FoldMap(f func(a, b Doc) Doc, g func(Doc) Doc, d ...Doc) Doc {