Function e_button

lib/web/CodeMirror/src/util/event.js:94–103

(e)

export function e_target(e) {return e.target || e.srcElement}
export function e_button(e) {
  let b = e.which
  if (b == null) {
    if (e.button & 1) b = 1
    else if (e.button & 2) b = 3
    else if (e.button & 4) b = 2
  }
  if (mac && e.ctrlKey && b == 1) b = 3
  return b
}