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Current File : /proc/self/root/usr/share/nodejs/codemirror/src/input/keymap.js
import { flipCtrlCmd, mac, presto } from "../util/browser.js"
import { map } from "../util/misc.js"

import { keyNames } from "./keynames.js"

export let keyMap = {}

keyMap.basic = {
  "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",
  "End": "goLineEnd", "Home": "goLineStartSmart", "PageUp": "goPageUp", "PageDown": "goPageDown",
  "Delete": "delCharAfter", "Backspace": "delCharBefore", "Shift-Backspace": "delCharBefore",
  "Tab": "defaultTab", "Shift-Tab": "indentAuto",
  "Enter": "newlineAndIndent", "Insert": "toggleOverwrite",
  "Esc": "singleSelection"
}
// Note that the save and find-related commands aren't defined by
// default. User code or addons can define them. Unknown commands
// are simply ignored.
keyMap.pcDefault = {
  "Ctrl-A": "selectAll", "Ctrl-D": "deleteLine", "Ctrl-Z": "undo", "Shift-Ctrl-Z": "redo", "Ctrl-Y": "redo",
  "Ctrl-Home": "goDocStart", "Ctrl-End": "goDocEnd", "Ctrl-Up": "goLineUp", "Ctrl-Down": "goLineDown",
  "Ctrl-Left": "goGroupLeft", "Ctrl-Right": "goGroupRight", "Alt-Left": "goLineStart", "Alt-Right": "goLineEnd",
  "Ctrl-Backspace": "delGroupBefore", "Ctrl-Delete": "delGroupAfter", "Ctrl-S": "save", "Ctrl-F": "find",
  "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",
  "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",
  "Ctrl-U": "undoSelection", "Shift-Ctrl-U": "redoSelection", "Alt-U": "redoSelection",
  "fallthrough": "basic"
}
// Very basic readline/emacs-style bindings, which are standard on Mac.
keyMap.emacsy = {
  "Ctrl-F": "goCharRight", "Ctrl-B": "goCharLeft", "Ctrl-P": "goLineUp", "Ctrl-N": "goLineDown",
  "Alt-F": "goWordRight", "Alt-B": "goWordLeft", "Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd",
  "Ctrl-V": "goPageDown", "Shift-Ctrl-V": "goPageUp", "Ctrl-D": "delCharAfter", "Ctrl-H": "delCharBefore",
  "Alt-D": "delWordAfter", "Alt-Backspace": "delWordBefore", "Ctrl-K": "killLine", "Ctrl-T": "transposeChars",
  "Ctrl-O": "openLine"
}
keyMap.macDefault = {
  "Cmd-A": "selectAll", "Cmd-D": "deleteLine", "Cmd-Z": "undo", "Shift-Cmd-Z": "redo", "Cmd-Y": "redo",
  "Cmd-Home": "goDocStart", "Cmd-Up": "goDocStart", "Cmd-End": "goDocEnd", "Cmd-Down": "goDocEnd", "Alt-Left": "goGroupLeft",
  "Alt-Right": "goGroupRight", "Cmd-Left": "goLineLeft", "Cmd-Right": "goLineRight", "Alt-Backspace": "delGroupBefore",
  "Ctrl-Alt-Backspace": "delGroupAfter", "Alt-Delete": "delGroupAfter", "Cmd-S": "save", "Cmd-F": "find",
  "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",
  "Cmd-[": "indentLess", "Cmd-]": "indentMore", "Cmd-Backspace": "delWrappedLineLeft", "Cmd-Delete": "delWrappedLineRight",
  "Cmd-U": "undoSelection", "Shift-Cmd-U": "redoSelection", "Ctrl-Up": "goDocStart", "Ctrl-Down": "goDocEnd",
  "fallthrough": ["basic", "emacsy"]
}
keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault

// KEYMAP DISPATCH

function normalizeKeyName(name) {
  let parts = name.split(/-(?!$)/)
  name = parts[parts.length - 1]
  let alt, ctrl, shift, cmd
  for (let i = 0; i < parts.length - 1; i++) {
    let mod = parts[i]
    if (/^(cmd|meta|m)$/i.test(mod)) cmd = true
    else if (/^a(lt)?$/i.test(mod)) alt = true
    else if (/^(c|ctrl|control)$/i.test(mod)) ctrl = true
    else if (/^s(hift)?$/i.test(mod)) shift = true
    else throw new Error("Unrecognized modifier name: " + mod)
  }
  if (alt) name = "Alt-" + name
  if (ctrl) name = "Ctrl-" + name
  if (cmd) name = "Cmd-" + name
  if (shift) name = "Shift-" + name
  return name
}

// This is a kludge to keep keymaps mostly working as raw objects
// (backwards compatibility) while at the same time support features
// like normalization and multi-stroke key bindings. It compiles a
// new normalized keymap, and then updates the old object to reflect
// this.
export function normalizeKeyMap(keymap) {
  let copy = {}
  for (let keyname in keymap) if (keymap.hasOwnProperty(keyname)) {
    let value = keymap[keyname]
    if (/^(name|fallthrough|(de|at)tach)$/.test(keyname)) continue
    if (value == "...") { delete keymap[keyname]; continue }

    let keys = map(keyname.split(" "), normalizeKeyName)
    for (let i = 0; i < keys.length; i++) {
      let val, name
      if (i == keys.length - 1) {
        name = keys.join(" ")
        val = value
      } else {
        name = keys.slice(0, i + 1).join(" ")
        val = "..."
      }
      let prev = copy[name]
      if (!prev) copy[name] = val
      else if (prev != val) throw new Error("Inconsistent bindings for " + name)
    }
    delete keymap[keyname]
  }
  for (let prop in copy) keymap[prop] = copy[prop]
  return keymap
}

export function lookupKey(key, map, handle, context) {
  map = getKeyMap(map)
  let found = map.call ? map.call(key, context) : map[key]
  if (found === false) return "nothing"
  if (found === "...") return "multi"
  if (found != null && handle(found)) return "handled"

  if (map.fallthrough) {
    if (Object.prototype.toString.call(map.fallthrough) != "[object Array]")
      return lookupKey(key, map.fallthrough, handle, context)
    for (let i = 0; i < map.fallthrough.length; i++) {
      let result = lookupKey(key, map.fallthrough[i], handle, context)
      if (result) return result
    }
  }
}

// Modifier key presses don't count as 'real' key presses for the
// purpose of keymap fallthrough.
export function isModifierKey(value) {
  let name = typeof value == "string" ? value : keyNames[value.keyCode]
  return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod"
}

export function addModifierNames(name, event, noShift) {
  let base = name
  if (event.altKey && base != "Alt") name = "Alt-" + name
  if ((flipCtrlCmd ? event.metaKey : event.ctrlKey) && base != "Ctrl") name = "Ctrl-" + name
  if ((flipCtrlCmd ? event.ctrlKey : event.metaKey) && base != "Mod") name = "Cmd-" + name
  if (!noShift && event.shiftKey && base != "Shift") name = "Shift-" + name
  return name
}

// Look up the name of a key as indicated by an event object.
export function keyName(event, noShift) {
  if (presto && event.keyCode == 34 && event["char"]) return false
  let name = keyNames[event.keyCode]
  if (name == null || event.altGraphKey) return false
  // Ctrl-ScrollLock has keyCode 3, same as Ctrl-Pause,
  // so we'll use event.code when available (Chrome 48+, FF 38+, Safari 10.1+)
  if (event.keyCode == 3 && event.code) name = event.code
  return addModifierNames(name, event, noShift)
}

export function getKeyMap(val) {
  return typeof val == "string" ? keyMap[val] : val
}

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