add hw2

node_modules/fast-redact/lib/validator.js

@@ -0,0 +1,33 @@
+'use strict'
+
+module.exports = validator
+
+function validator (opts = {}) {
+  const {
+    ERR_PATHS_MUST_BE_STRINGS = () => 'fast-redact - Paths must be (non-empty) strings',
+    ERR_INVALID_PATH = (s) => `fast-redact – Invalid path (${s})`
+  } = opts
+
+  return function validate ({ paths }) {
+    paths.forEach((s) => {
+      if (typeof s !== 'string') {
+        throw Error(ERR_PATHS_MUST_BE_STRINGS())
+      }
+      try {
+        if (/〇/.test(s)) throw Error()
+        const expr = (s[0] === '[' ? '' : '.') + s.replace(/^\*/, '〇').replace(/\.\*/g, '.〇').replace(/\[\*\]/g, '[〇]')
+        if (/\n|\r|;/.test(expr)) throw Error()
+        if (/\/\*/.test(expr)) throw Error()
+        /* eslint-disable-next-line */
+        Function(`
+            'use strict'
+            const o = new Proxy({}, { get: () => o, set: () => { throw Error() } });
+            const 〇 = null;
+            o${expr}
+            if ([o${expr}].length !== 1) throw Error()`)()
+      } catch (e) {
+        throw Error(ERR_INVALID_PATH(s))
+      }
+    })
+  }
+}