sgauthier
6e64e138e2
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51 lines
1.0 KiB
JavaScript
51 lines
1.0 KiB
JavaScript
'use strict'
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var hasOwnProperty = require('../constant/has-own-property.js')
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var chunkedSplice = require('./chunked-splice.js')
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var miniflat = require('./miniflat.js')
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// Combine several syntax extensions into one.
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function combineExtensions(extensions) {
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var all = {}
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var index = -1
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while (++index < extensions.length) {
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extension(all, extensions[index])
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}
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return all
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}
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function extension(all, extension) {
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var hook
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var left
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var right
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var code
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for (hook in extension) {
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left = hasOwnProperty.call(all, hook) ? all[hook] : (all[hook] = {})
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right = extension[hook]
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for (code in right) {
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left[code] = constructs(
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miniflat(right[code]),
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hasOwnProperty.call(left, code) ? left[code] : []
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)
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}
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}
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}
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function constructs(list, existing) {
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var index = -1
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var before = []
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while (++index < list.length) {
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;(list[index].add === 'after' ? existing : before).push(list[index])
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}
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chunkedSplice(existing, 0, 0, before)
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return existing
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}
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module.exports = combineExtensions
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