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# The code in `injectedCode()`, below, is injected into the page's own execution context.
#
# This is based on method 2b here: http://stackoverflow.com/a/9517879, and
# @mrmr1993's #1167.
injectedCode = () ->
# Note the presence of "click" listeners installed with `addEventListener()` (for link hints).
_addEventListener = EventTarget::addEventListener
_toString = Function::toString
# Note some pages may override Element (see https://github.com/gdh1995/vimium-plus/issues/11)
EL = if typeof Element == "function" then Element else HTMLElement
Anchor = HTMLAnchorElement
addEventListener = (type, listener, useCapture) ->
if type == "click" and this instanceof EL
unless this instanceof Anchor # Just skip <a>.
try @setAttribute "_vimium-has-onclick-listener", ""
_addEventListener?.apply this, arguments
newToString = () ->
real = if this == newToString then _toString else
if this == addEventListener then _addEventListener else
this
_toString.apply real, arguments
EventTarget::addEventListener = addEventListener
# Libraries like Angular/Zone and CKEditor check if element.addEventListener is native,
# so here we hook it to tell outsides it is exactly native.
# This idea is from https://github.com/angular/zone.js/pull/686,
# and see more discussions in https://github.com/ckeditor/ckeditor5-build-classic/issues/34.
Function::toString = newToString
script = document.createElement "script"
script.textContent = "(#{injectedCode.toString()})()"
(document.head || document.documentElement).appendChild script
script.remove()
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