| 1 | package check |
| 2 | |
| 3 | import ( |
| 4 | "reflect" |
| 5 | "regexp" |
| 6 | "strings" |
| 7 | "testing" |
| 8 | |
| 9 | "amadan.net/rastrillo/fiesta" |
| 10 | "amadan.net/rastrillo/fiesta/example" |
| 11 | ) |
| 12 | |
| 13 | // A list-grid row holds one identity link: the stretched a.rst-nm or |
| 14 | // a[rst-person] that makes the whole row its tap target. Two in one |
| 15 | // row would overlay each other, and the later one would hide the |
| 16 | // earlier link. Read off every example state's markup. |
| 17 | |
| 18 | var markupTag = regexp.MustCompile(`<(/?)([a-zA-Z][a-zA-Z0-9-]*)([^>]*?)(/?)>`) |
| 19 | |
| 20 | var voidElement = map[string]bool{"area": true, "br": true, "col": true, "hr": true, "img": true, "input": true, "link": true, "meta": true, "source": true, "wbr": true} |
| 21 | |
| 22 | var ( |
| 23 | classValue = regexp.MustCompile(`class="([^"]*)"`) |
| 24 | attrNamed = func(name string) *regexp.Regexp { |
| 25 | return regexp.MustCompile(`(?:^|\s)` + name + `(?:="([^"]*)")?(?:\s|$)`) |
| 26 | } |
| 27 | lrowAttr = attrNamed("rst-lrow") |
| 28 | personAttr = attrNamed("rst-person") |
| 29 | ) |
| 30 | |
| 31 | // hasClass reports whether attrs carries class token c, exactly. |
| 32 | func hasClass(attrs, c string) bool { |
| 33 | if m := classValue.FindStringSubmatch(attrs); m != nil { |
| 34 | for _, tok := range strings.Fields(m[1]) { |
| 35 | if tok == c { |
| 36 | return true |
| 37 | } |
| 38 | } |
| 39 | } |
| 40 | return false |
| 41 | } |
| 42 | |
| 43 | // isDataRow is a list-grid row in either spelling, not its head row. |
| 44 | func isDataRow(attrs string) bool { |
| 45 | a := " " + attrs + " " |
| 46 | if m := lrowAttr.FindStringSubmatch(a); m != nil { |
| 47 | return !strings.Contains(" "+m[1]+" ", " head ") |
| 48 | } |
| 49 | return hasClass(attrs, "rst-lrow") && !hasClass(attrs, "rst-lrow--head") |
| 50 | } |
| 51 | |
| 52 | // isIdentityLink is a.rst-nm or a person link, in either spelling. |
| 53 | func isIdentityLink(attrs string) bool { |
| 54 | return hasClass(attrs, "rst-nm") || hasClass(attrs, "rst-person") || personAttr.MatchString(" "+attrs+" ") |
| 55 | } |
| 56 | |
| 57 | // identityLinksPerRow returns, for every [rst-lrow] data row in markup, |
| 58 | // how many of its DIRECT children are identity links (a.rst-nm or |
| 59 | // a[rst-person]). A small depth-tracking reader is enough: the samples |
| 60 | // are hand-written, well-formed markup. |
| 61 | func identityLinksPerRow(markup string) []int { |
| 62 | var out []int |
| 63 | type frame struct { |
| 64 | row bool |
| 65 | slot int |
| 66 | } |
| 67 | var stack []frame |
| 68 | for _, m := range markupTag.FindAllStringSubmatch(markup, -1) { |
| 69 | closing, name, attrs, self := m[1] == "/", strings.ToLower(m[2]), m[3], m[4] == "/" |
| 70 | if closing { |
| 71 | if len(stack) > 0 { |
| 72 | stack = stack[:len(stack)-1] |
| 73 | } |
| 74 | continue |
| 75 | } |
| 76 | parentRow := len(stack) > 0 && stack[len(stack)-1].row |
| 77 | if parentRow && name == "a" && isIdentityLink(attrs) { |
| 78 | out[stack[len(stack)-1].slot]++ |
| 79 | } |
| 80 | if self || voidElement[name] { |
| 81 | continue |
| 82 | } |
| 83 | f := frame{} |
| 84 | if isDataRow(attrs) { |
| 85 | f = frame{row: true, slot: len(out)} |
| 86 | out = append(out, 0) |
| 87 | } |
| 88 | stack = append(stack, f) |
| 89 | } |
| 90 | return out |
| 91 | } |
| 92 | |
| 93 | func TestEveryListGridRowHasOneIdentityLink(t *testing.T) { |
| 94 | pieces, err := example.All(fiesta.FS()) |
| 95 | if err != nil { |
| 96 | t.Fatal(err) |
| 97 | } |
| 98 | rows := 0 |
| 99 | for _, p := range pieces { |
| 100 | for i, n := range identityLinksPerRow(p.Markup) { |
| 101 | rows++ |
| 102 | if n > 1 { |
| 103 | t.Errorf("example %s/%s row %d has %d identity links; one per row, or the later overlay hides the earlier link", p.Name, p.State, i, n) |
| 104 | } |
| 105 | } |
| 106 | } |
| 107 | if rows == 0 { |
| 108 | t.Fatal("found no list-grid data rows in the examples; the reader is broken") |
| 109 | } |
| 110 | // The reader itself, both ways. |
| 111 | two := `<div rst-lrow><a class="rst-nm" href="/a">A</a><a rst-person href="/p"><span rst-person-name>P</span></a></div>` |
| 112 | if got := identityLinksPerRow(two); len(got) != 1 || got[0] != 2 { |
| 113 | t.Errorf("a row with two identity links reads as %v, want [2]", got) |
| 114 | } |
| 115 | nested := `<div rst-lrow><span><a class="rst-nm" href="/a">A</a></span><a class="rst-nm" href="/b">B</a></div>` |
| 116 | if got := identityLinksPerRow(nested); len(got) != 1 || got[0] != 1 { |
| 117 | t.Errorf("a nested link counted as a direct child: %v, want [1]", got) |
| 118 | } |
| 119 | // markup-spelling: old-spelling begin — the reader must count the |
| 120 | // class spelling too, which apps still write, so these cases use it. |
| 121 | for _, c := range []struct { |
| 122 | markup string |
| 123 | want []int |
| 124 | }{ |
| 125 | {`<div class="rst-lrow"><a class="rst-nm" href="/a">A</a><a class="rst-person" href="/p">P</a></div>`, []int{2}}, |
| 126 | {`<div rst-lrow=""><a class="rst-nm" href="/a">A</a><a rst-person href="/p">P</a></div>`, []int{2}}, |
| 127 | {`<div rst-lrow="head"><a class="rst-nm" href="/a">A</a></div><div class="rst-lrow rst-lrow--head"><a class="rst-nm" href="/a">A</a></div>`, nil}, |
| 128 | {`<div rst-lrow><a class="rst-nm-extra" href="/a">A</a></div>`, []int{0}}, |
| 129 | // markup-spelling: old-spelling end |
| 130 | } { |
| 131 | if got := identityLinksPerRow(c.markup); !reflect.DeepEqual(got, c.want) { |
| 132 | t.Errorf("identityLinksPerRow(%s) = %v, want %v", c.markup, got, c.want) |
| 133 | } |
| 134 | } |
| 135 | } |
| 136 | |
amadan