| 1 | package memoriatest |
| 2 | |
| 3 | import ( |
| 4 | "strings" |
| 5 | "testing" |
| 6 | |
| 7 | "golang.org/x/net/html" |
| 8 | ) |
| 9 | |
| 10 | // The helpers in this file read a page the way a browser does, through |
| 11 | // an HTML parser, so a check cannot be passed by spelling the same markup |
| 12 | // differently: rst-refresh='x', RST-REFRESH="x" and rst-refresh=x are one |
| 13 | // attribute to a browser and three strings to a regex. |
| 14 | |
| 15 | func parsePage(t *testing.T, body string) *html.Node { |
| 16 | t.Helper() |
| 17 | doc, err := html.Parse(strings.NewReader(body)) |
| 18 | if err != nil { |
| 19 | t.Fatalf("parsing the page: %v", err) |
| 20 | } |
| 21 | return doc |
| 22 | } |
| 23 | |
| 24 | func attrOf(n *html.Node, key string) (string, bool) { |
| 25 | for _, a := range n.Attr { |
| 26 | if a.Key == key { |
| 27 | return a.Val, true |
| 28 | } |
| 29 | } |
| 30 | return "", false |
| 31 | } |
| 32 | |
| 33 | func findAll(root *html.Node, match func(*html.Node) bool) []*html.Node { |
| 34 | var out []*html.Node |
| 35 | var walk func(*html.Node) |
| 36 | walk = func(n *html.Node) { |
| 37 | if n.Type == html.ElementNode && match(n) { |
| 38 | out = append(out, n) |
| 39 | } |
| 40 | for c := n.FirstChild; c != nil; c = c.NextSibling { |
| 41 | walk(c) |
| 42 | } |
| 43 | } |
| 44 | walk(root) |
| 45 | return out |
| 46 | } |
| 47 | |
| 48 | func hasAttr(key string) func(*html.Node) bool { |
| 49 | return func(n *html.Node) bool { _, ok := attrOf(n, key); return ok } |
| 50 | } |
| 51 | |
| 52 | func elementWith(tag, key, val string) func(*html.Node) bool { |
| 53 | return func(n *html.Node) bool { |
| 54 | v, ok := attrOf(n, key) |
| 55 | return n.Data == tag && ok && v == val |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | // within reports whether n is inside ancestor, or is it. |
| 60 | func within(n, ancestor *html.Node) bool { |
| 61 | for ; n != nil; n = n.Parent { |
| 62 | if n == ancestor { |
| 63 | return true |
| 64 | } |
| 65 | } |
| 66 | return false |
| 67 | } |
| 68 | |
| 69 | func textOf(n *html.Node) string { |
| 70 | var b strings.Builder |
| 71 | var walk func(*html.Node) |
| 72 | walk = func(n *html.Node) { |
| 73 | if n.Type == html.TextNode { |
| 74 | b.WriteString(n.Data) |
| 75 | } |
| 76 | for c := n.FirstChild; c != nil; c = c.NextSibling { |
| 77 | walk(c) |
| 78 | } |
| 79 | } |
| 80 | walk(n) |
| 81 | return strings.Join(strings.Fields(b.String()), " ") |
| 82 | } |
| 83 | |
| 84 | // region returns the one element carrying rst-refresh=name. |
| 85 | func region(t *testing.T, doc *html.Node, name string) *html.Node { |
| 86 | t.Helper() |
| 87 | found := findAll(doc, func(n *html.Node) bool { v, ok := attrOf(n, "rst-refresh"); return ok && v == name }) |
| 88 | if len(found) != 1 { |
| 89 | t.Fatalf("%d regions named %q on the page, want 1", len(found), name) |
| 90 | } |
| 91 | return found[0] |
| 92 | } |
| 93 | |
amadan