49 lines
997 B
JavaScript
49 lines
997 B
JavaScript
|
export default combineExtensions
|
||
|
|
|
||
|
|
import own from '../constant/has-own-property.mjs'
|
||
|
|
import chunkedSplice from './chunked-splice.mjs'
|
||
|
|
import miniflat from './miniflat.mjs'
|
||
|
|
|
||
|
|
// Combine several syntax extensions into one.
|
||
|
|
function combineExtensions(extensions) {
|
||
|
|
var all = {}
|
||
|
|
var index = -1
|
||
|
|
|
||
|
|
while (++index < extensions.length) {
|
||
|
|
extension(all, extensions[index])
|
||
|
|
}
|
||
|
|
|
||
|
|
return all
|
||
|
|
}
|
||
|
|
|
||
|
|
function extension(all, extension) {
|
||
|
|
var hook
|
||
|
|
var left
|
||
|
|
var right
|
||
|
|
var code
|
||
|
|
|
||
|
|
for (hook in extension) {
|
||
|
|
left = own.call(all, hook) ? all[hook] : (all[hook] = {})
|
||
|
|
right = extension[hook]
|
||
|
|
|
||
|
|
for (code in right) {
|
||
|
|
left[code] = constructs(
|
||
|
|
miniflat(right[code]),
|
||
|
|
own.call(left, code) ? left[code] : []
|
||
|
|
)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
function constructs(list, existing) {
|
||
|
|
var index = -1
|
||
|
|
var before = []
|
||
|
|
|
||
|
|
while (++index < list.length) {
|
||
|
|
;(list[index].add === 'after' ? existing : before).push(list[index])
|
||
|
|
}
|
||
|
|
|
||
|
|
chunkedSplice(existing, 0, 0, before)
|
||
|
|
return existing
|
||
|
|
}
|