1 files changed, 91 insertions, 0 deletions
diff --git a/node_modules/vuepress/lib/markdown/link.js b/node_modules/vuepress/lib/markdown/link.js
new file mode 100644
index 00000000..bbe9550d
--- /dev/null
+++ b/node_modules/vuepress/lib/markdown/link.js
@@ -0,0 +1,91 @@
+// markdown-it plugin for:
+// 1. adding target="_blank" to external links
+// 2. converting internal links to <router-link>
+
+const indexRE = /(.*)(index|readme).md(#?.*)$/i
+
+module.exports = (md, externalAttrs) => {
+  let hasOpenRouterLink = false
+  let hasOpenExternalLink = false
+
+  md.renderer.rules.link_open = (tokens, idx, options, env, self) => {
+    const token = tokens[idx]
+    const hrefIndex = token.attrIndex('href')
+    if (hrefIndex >= 0) {
+      const link = token.attrs[hrefIndex]
+      const href = link[1]
+      const isExternal = /^https?:/.test(href)
+      const isSourceLink = /(\/|\.md|\.html)(#.*)?$/.test(href)
+      if (isExternal) {
+        Object.entries(externalAttrs).forEach(([key, val]) => {
+          token.attrSet(key, val)
+        })
+        if (/_blank/i.test(externalAttrs['target'])) {
+          hasOpenExternalLink = true
+        }
+      } else if (isSourceLink) {
+        hasOpenRouterLink = true
+        tokens[idx] = toRouterLink(token, link)
+      }
+    }
+    return self.renderToken(tokens, idx, options)
+  }
+
+  function toRouterLink (token, link) {
+    link[0] = 'to'
+    let to = link[1]
+
+    // convert link to filename and export it for existence check
+    const links = md.__data.links || (md.__data.links = [])
+    links.push(to)
+
+    const indexMatch = to.match(indexRE)
+    if (indexMatch) {
+      const [, path, , hash] = indexMatch
+      to = path + hash
+    } else {
+      to = to
+        .replace(/\.md$/, '.html')
+        .replace(/\.md(#.*)$/, '.html$1')
+    }
+
+    // relative path usage.
+    if (!to.startsWith('/')) {
+      to = ensureBeginningDotSlash(to)
+    }
+
+    // markdown-it encodes the uri
+    link[1] = decodeURI(to)
+
+    // export the router links for testing
+    const routerLinks = md.__data.routerLinks || (md.__data.routerLinks = [])
+    routerLinks.push(to)
+
+    return Object.assign({}, token, {
+      tag: 'router-link'
+    })
+  }
+
+  md.renderer.rules.link_close = (tokens, idx, options, env, self) => {
+    const token = tokens[idx]
+    if (hasOpenRouterLink) {
+      token.tag = 'router-link'
+      hasOpenRouterLink = false
+    }
+    if (hasOpenExternalLink) {
+      hasOpenExternalLink = false
+      // add OutBoundLink to the beforeend of this link if it opens in _blank.
+      return '<OutboundLink/>' + self.renderToken(tokens, idx, options)
+    }
+    return self.renderToken(tokens, idx, options)
+  }
+}
+
+const beginningSlashRE = /^\.\//
+
+function ensureBeginningDotSlash (path) {
+  if (beginningSlashRE.test(path)) {
+    return path
+  }
+  return './' + path
+}