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backend/node_modules/safe-regex2/index.js

@@ -0,0 +1,52 @@
+'use strict'
+
+const parse = require('ret')
+const types = parse.types
+
+function safeRegex (re, opts) {
+  if (!opts) opts = {}
+  const replimit = opts.limit === undefined ? 25 : opts.limit
+
+  if (isRegExp(re)) re = re.source
+  else if (typeof re !== 'string') re = String(re)
+
+  try { re = parse(re) } catch (err) { return false }
+
+  let reps = 0
+  return (function walk (node, starHeight) {
+    let i
+    let ok
+    let len
+
+    if (node.type === types.REPETITION) {
+      starHeight++
+      reps++
+      if (starHeight > 1) return false
+      if (reps > replimit) return false
+    }
+
+    if (node.options) {
+      for (i = 0, len = node.options.length; i < len; i++) {
+        ok = walk({ stack: node.options[i] }, starHeight)
+        if (!ok) return false
+      }
+    }
+    const stack = node.stack || (node.value && node.value.stack)
+    if (!stack) return true
+
+    for (i = 0; i < stack.length; i++) {
+      ok = walk(stack[i], starHeight)
+      if (!ok) return false
+    }
+
+    return true
+  })(re, 0)
+}
+
+function isRegExp (x) {
+  return {}.toString.call(x) === '[object RegExp]'
+}
+
+module.exports = safeRegex
+module.exports.default = safeRegex
+module.exports.safeRegex = safeRegex