gnezim
78 lines
2.2 KiB
JavaScript
78 lines
2.2 KiB
JavaScript
var visit = require('unist-util-visit')
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var definitions = require('mdast-util-definitions')
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var spaceSeparated = require('space-separated-tokens').parse
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var absolute = require('is-absolute-url')
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var extend = require('extend')
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module.exports = externalLinks
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var defaultTarget = '_blank'
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var defaultRel = ['nofollow', 'noopener', 'noreferrer']
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var defaultProtocols = ['http', 'https']
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function externalLinks(options) {
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var settings = options || {}
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var target = settings.target
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var rel = settings.rel
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var protocols = settings.protocols || defaultProtocols
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var content = settings.content
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var contentProperties = settings.contentProperties || {}
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if (typeof rel === 'string') {
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rel = spaceSeparated(rel)
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}
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if (content && typeof content === 'object' && !('length' in content)) {
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content = [content]
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}
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return transform
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function transform(tree) {
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var definition = definitions(tree)
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visit(tree, ['link', 'linkReference'], visitor)
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function visitor(node) {
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var ctx = node.type === 'link' ? node : definition(node.identifier)
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var protocol
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var data
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var props
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/* istanbul ignore if - undefined references can be injected into the tree
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* by plugins. */
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if (!ctx) return
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protocol = ctx.url.slice(0, ctx.url.indexOf(':'))
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if (absolute(ctx.url) && protocols.indexOf(protocol) !== -1) {
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data = node.data || (node.data = {})
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props = data.hProperties || (data.hProperties = {})
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if (target !== false) {
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props.target = target || defaultTarget
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}
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if (rel !== false) {
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props.rel = (rel || defaultRel).concat()
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}
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if (content) {
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// `fragment` is not a known mdast node, but unknown nodes with
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// children are handled as elements by `mdast-util-to-hast`:
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// See: <https://github.com/syntax-tree/mdast-util-to-hast#notes>.
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node.children.push({
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type: 'fragment',
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children: [],
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data: {
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hName: 'span',
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hProperties: extend(true, contentProperties),
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hChildren: extend(true, content)
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}
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})
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}
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}
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}
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}
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}
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