feat: locals data from script tag, close #117

Author: Scrum

lib/index.js

@@ -10,6 +10,7 @@ const escapeRegexpString = require('./escape')
 const makeLocalsBackup = require('./backup').make
 const revertBackupedLocals = require('./backup').revert
 const placeholders = require('./placeholders')
+const scriptDataLocals = require('./locals')
 
 const delimitersSettings = []
 let conditionals, switches, loops, scopes, ignored, delimitersReplace, unescapeDelimitersReplace
@@ -156,7 +157,9 @@ module.exports = function postHTMLExpressions (options) {
 
   // kick off the parsing
   return function (tree) {
-    return normalizeTree(clearRawTag(walk({ locals: options.locals, strictMode: options.strictMode }, tree)), tree.options)
+    const { locals } = scriptDataLocals(tree, options)
+
+    return normalizeTree(clearRawTag(walk({ locals: { ...options.locals, ...locals }, strictMode: options.strictMode }, tree)), tree.options)
   }
 }
 

lib/locals.js

@@ -0,0 +1,44 @@
+'use strict'
+
+const vm = require('vm')
+const matchHelper = require('posthtml-match-helper')
+const { render } = require('posthtml-render')
+
+// const code = 'module.exports = {a: 1}';
+const ctx = vm.createContext({ module })
+
+// const r = vm.runInContext(code, ctx)
+
+/**
+ * @description Get the script tag with locals attribute from a node list and return locals.
+ *
+ * @method scriptDataLocals
+ *
+ * @param  {Array}   tree Nodes
+ *
+ * @return {Object}   {} Locals
+ */
+function scriptDataLocals (tree, options) {
+  const locals = {}
+  const localsAttr = options.localsAttr || 'locals'
+
+  tree.match(matchHelper(`script[${localsAttr}]`), node => {
+    if (node.content) {
+      const code = render(node.content)
+
+      try {
+        const local = vm.runInContext(code, ctx)
+
+        Object.assign(locals, local)
+      } catch {};
+    }
+
+    return node
+  })
+
+  return {
+    locals
+  }
+}
+
+module.exports = scriptDataLocals