1 files changed, 83 insertions, 0 deletions
diff --git a/node_modules/vuepress/lib/util/index.js b/node_modules/vuepress/lib/util/index.js
new file mode 100644
index 00000000..52044a8f
--- /dev/null
+++ b/node_modules/vuepress/lib/util/index.js
@@ -0,0 +1,83 @@
+const { deeplyParseHeaders } = require('./parseHeaders')
+
+exports.normalizeHeadTag = function (tag) {
+  if (typeof tag === 'string') {
+    tag = [tag]
+  }
+  const tagName = tag[0]
+  return {
+    tagName,
+    attributes: tag[1] || {},
+    innerHTML: tag[2] || '',
+    closeTag: !(tagName === 'meta' || tagName === 'link')
+  }
+}
+
+exports.applyUserWebpackConfig = function (userConfig, config, isServer) {
+  const merge = require('webpack-merge')
+  if (typeof userConfig === 'object') {
+    return merge(config, userConfig)
+  }
+  if (typeof userConfig === 'function') {
+    const res = userConfig(config, isServer)
+    if (res && typeof res === 'object') {
+      return merge(config, res)
+    }
+  }
+  return config
+}
+
+exports.inferTitle = function (frontmatter) {
+  if (frontmatter.data.home) {
+    return 'Home'
+  }
+  if (frontmatter.data.title) {
+    return deeplyParseHeaders(frontmatter.data.title)
+  }
+  const match = frontmatter.content.trim().match(/^#+\s+(.*)/m)
+  if (match) {
+    return deeplyParseHeaders(match[1])
+  }
+}
+
+exports.parseFrontmatter = function (content) {
+  const matter = require('gray-matter')
+  const toml = require('toml')
+
+  return matter(content, {
+    excerpt_separator: '<!-- more -->',
+    engines: {
+      toml: toml.parse.bind(toml),
+      excerpt: false
+    }
+  })
+}
+
+const LRU = require('lru-cache')
+const cache = LRU({ max: 1000 })
+
+exports.extractHeaders = function (content, include = [], md) {
+  const key = content + include.join(',')
+  const hit = cache.get(key)
+  if (hit) {
+    return hit
+  }
+
+  const tokens = md.parse(content, {})
+
+  const res = []
+  tokens.forEach((t, i) => {
+    if (t.type === 'heading_open' && include.includes(t.tag)) {
+      const title = tokens[i + 1].content
+      const slug = t.attrs.find(([name]) => name === 'id')[1]
+      res.push({
+        level: parseInt(t.tag.slice(1), 10),
+        title: deeplyParseHeaders(title),
+        slug: slug || md.slugify(title)
+      })
+    }
+  })
+
+  cache.set(key, res)
+  return res
+}