| 1 | package cdp |
| 2 | |
| 3 | import ( |
| 4 | "fmt" |
| 5 | "strings" |
| 6 | "unicode" |
| 7 | ) |
| 8 | |
| 9 | // Modifier bits as the DevTools input domain defines them. |
| 10 | const ( |
| 11 | modAlt = 1 |
| 12 | modCtrl = 2 |
| 13 | modMeta = 4 |
| 14 | modShift = 8 |
| 15 | ) |
| 16 | |
| 17 | // namedKey is one key the model can name in a chord. |
| 18 | type namedKey struct { |
| 19 | key string |
| 20 | code string |
| 21 | vk int |
| 22 | text string |
| 23 | } |
| 24 | |
| 25 | var namedKeys = map[string]namedKey{ |
| 26 | "enter": {"Enter", "Enter", 13, "\r"}, |
| 27 | "return": {"Enter", "Enter", 13, "\r"}, |
| 28 | "tab": {"Tab", "Tab", 9, "\t"}, |
| 29 | "escape": {"Escape", "Escape", 27, ""}, |
| 30 | "esc": {"Escape", "Escape", 27, ""}, |
| 31 | "space": {" ", "Space", 32, " "}, |
| 32 | "backspace": {"Backspace", "Backspace", 8, ""}, |
| 33 | "delete": {"Delete", "Delete", 46, ""}, |
| 34 | "insert": {"Insert", "Insert", 45, ""}, |
| 35 | "home": {"Home", "Home", 36, ""}, |
| 36 | "end": {"End", "End", 35, ""}, |
| 37 | "pageup": {"PageUp", "PageUp", 33, ""}, |
| 38 | "pagedown": {"PageDown", "PageDown", 34, ""}, |
| 39 | "arrowup": {"ArrowUp", "ArrowUp", 38, ""}, |
| 40 | "arrowdown": {"ArrowDown", "ArrowDown", 40, ""}, |
| 41 | "arrowleft": {"ArrowLeft", "ArrowLeft", 37, ""}, |
| 42 | "arrowright": {"ArrowRight", "ArrowRight", 39, ""}, |
| 43 | "up": {"ArrowUp", "ArrowUp", 38, ""}, |
| 44 | "down": {"ArrowDown", "ArrowDown", 40, ""}, |
| 45 | "left": {"ArrowLeft", "ArrowLeft", 37, ""}, |
| 46 | "right": {"ArrowRight", "ArrowRight", 39, ""}, |
| 47 | } |
| 48 | |
| 49 | var modifierNames = map[string]int{ |
| 50 | "alt": modAlt, "option": modAlt, |
| 51 | "ctrl": modCtrl, "control": modCtrl, |
| 52 | "meta": modMeta, "cmd": modMeta, "command": modMeta, "super": modMeta, |
| 53 | "shift": modShift, |
| 54 | } |
| 55 | |
| 56 | // charEvents types one rune as a key press. Chrome turns a keyDown carrying |
| 57 | // text into keydown, keypress, and input, which is what a controlled React or |
| 58 | // Vue field listens for. |
| 59 | func charEvents(r rune) []map[string]any { |
| 60 | if r == '\n' || r == '\r' { |
| 61 | down, up, err := chordEvents("Enter") |
| 62 | if err != nil { |
| 63 | return nil |
| 64 | } |
| 65 | return []map[string]any{down, up} |
| 66 | } |
| 67 | text := string(r) |
| 68 | vk := 0 |
| 69 | if r < unicode.MaxASCII { |
| 70 | vk = int(unicode.ToUpper(r)) |
| 71 | } |
| 72 | return []map[string]any{ |
| 73 | {"type": "keyDown", "text": text, "unmodifiedText": text, "key": text, "windowsVirtualKeyCode": vk, "nativeVirtualKeyCode": vk}, |
| 74 | {"type": "keyUp", "key": text, "windowsVirtualKeyCode": vk, "nativeVirtualKeyCode": vk}, |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | // chordEvents parses a key name or '+'-joined chord such as Control+a into the |
| 79 | // key-down and key-up events that reproduce it. |
| 80 | func chordEvents(spec string) (map[string]any, map[string]any, error) { |
| 81 | parts := strings.Split(spec, "+") |
| 82 | modifiers := 0 |
| 83 | for i := range len(parts) - 1 { |
| 84 | name := strings.ToLower(strings.TrimSpace(parts[i])) |
| 85 | bit, ok := modifierNames[name] |
| 86 | if !ok { |
| 87 | return nil, nil, fmt.Errorf("unknown modifier %q in %q; use Alt, Control, Meta, or Shift", parts[i], spec) |
| 88 | } |
| 89 | modifiers |= bit |
| 90 | } |
| 91 | last := strings.TrimSpace(parts[len(parts)-1]) |
| 92 | if last == "" { |
| 93 | return nil, nil, fmt.Errorf("keys %q names no key", spec) |
| 94 | } |
| 95 | key, err := resolveKey(last) |
| 96 | if err != nil { |
| 97 | return nil, nil, err |
| 98 | } |
| 99 | // A character is produced only when neither Control nor Meta is held; with |
| 100 | // them the event is a shortcut and must carry no text. |
| 101 | text := key.text |
| 102 | if modifiers&(modCtrl|modMeta) != 0 { |
| 103 | text = "" |
| 104 | } |
| 105 | if modifiers&modShift != 0 && len([]rune(key.key)) == 1 { |
| 106 | upper := strings.ToUpper(key.key) |
| 107 | key.key = upper |
| 108 | if text != "" { |
| 109 | text = upper |
| 110 | } |
| 111 | } |
| 112 | down := map[string]any{ |
| 113 | "type": "keyDown", "key": key.key, "code": key.code, "modifiers": modifiers, |
| 114 | "windowsVirtualKeyCode": key.vk, "nativeVirtualKeyCode": key.vk, |
| 115 | } |
| 116 | if text != "" { |
| 117 | down["text"] = text |
| 118 | down["unmodifiedText"] = text |
| 119 | } else { |
| 120 | down["type"] = "rawKeyDown" |
| 121 | } |
| 122 | up := map[string]any{ |
| 123 | "type": "keyUp", "key": key.key, "code": key.code, "modifiers": modifiers, |
| 124 | "windowsVirtualKeyCode": key.vk, "nativeVirtualKeyCode": key.vk, |
| 125 | } |
| 126 | return down, up, nil |
| 127 | } |
| 128 | |
| 129 | // resolveKey maps a key name onto its event fields; a single character is its |
| 130 | // own key, and F1 to F24 follow their virtual key codes. |
| 131 | func resolveKey(name string) (namedKey, error) { |
| 132 | if k, ok := namedKeys[strings.ToLower(name)]; ok { |
| 133 | return k, nil |
| 134 | } |
| 135 | if n, ok := functionKey(name); ok { |
| 136 | return n, nil |
| 137 | } |
| 138 | runes := []rune(name) |
| 139 | if len(runes) != 1 { |
| 140 | return namedKey{}, fmt.Errorf("unknown key %q; use a single character, Enter, Tab, Escape, an arrow, or a function key", name) |
| 141 | } |
| 142 | r := runes[0] |
| 143 | return namedKey{key: name, code: charCode(r), vk: int(unicode.ToUpper(r)), text: name}, nil |
| 144 | } |
| 145 | |
| 146 | func functionKey(name string) (namedKey, bool) { |
| 147 | upper := strings.ToUpper(name) |
| 148 | if len(upper) < 2 || upper[0] != 'F' { |
| 149 | return namedKey{}, false |
| 150 | } |
| 151 | n := 0 |
| 152 | for _, r := range upper[1:] { |
| 153 | if r < '0' || r > '9' { |
| 154 | return namedKey{}, false |
| 155 | } |
| 156 | n = n*10 + int(r-'0') |
| 157 | } |
| 158 | if n < 1 || n > 24 { |
| 159 | return namedKey{}, false |
| 160 | } |
| 161 | return namedKey{key: upper, code: upper, vk: 111 + n}, true |
| 162 | } |
| 163 | |
| 164 | // charCode names the physical key a character sits on, which controlled inputs |
| 165 | // read from KeyboardEvent.code. |
| 166 | func charCode(r rune) string { |
| 167 | switch { |
| 168 | case unicode.IsLetter(r) && r < unicode.MaxASCII: |
| 169 | return "Key" + strings.ToUpper(string(r)) |
| 170 | case r >= '0' && r <= '9': |
| 171 | return "Digit" + string(r) |
| 172 | case r == ' ': |
| 173 | return "Space" |
| 174 | } |
| 175 | return "" |
| 176 | } |
| 177 |