add hw2

node_modules/glob-parent/index.js

@@ -0,0 +1,75 @@
+'use strict';
+
+var isGlob = require('is-glob');
+var pathPosixDirname = require('path').posix.dirname;
+var isWin32 = require('os').platform() === 'win32';
+
+var slash = '/';
+var backslash = /\\/g;
+var escaped = /\\([!*?|[\](){}])/g;
+
+/**
+ * @param {string} str
+ * @param {Object} opts
+ * @param {boolean} [opts.flipBackslashes=true]
+ */
+module.exports = function globParent(str, opts) {
+  var options = Object.assign({ flipBackslashes: true }, opts);
+
+  // flip windows path separators
+  if (options.flipBackslashes && isWin32 && str.indexOf(slash) < 0) {
+    str = str.replace(backslash, slash);
+  }
+
+  // special case for strings ending in enclosure containing path separator
+  if (isEnclosure(str)) {
+    str += slash;
+  }
+
+  // preserves full path in case of trailing path separator
+  str += 'a';
+
+  // remove path parts that are globby
+  do {
+    str = pathPosixDirname(str);
+  } while (isGlobby(str));
+
+  // remove escape chars and return result
+  return str.replace(escaped, '$1');
+};
+
+function isEnclosure(str) {
+  var lastChar = str.slice(-1);
+
+  var enclosureStart;
+  switch (lastChar) {
+    case '}':
+      enclosureStart = '{';
+      break;
+    case ']':
+      enclosureStart = '[';
+      break;
+    default:
+      return false;
+  }
+
+  var foundIndex = str.indexOf(enclosureStart);
+  if (foundIndex < 0) {
+    return false;
+  }
+
+  return str.slice(foundIndex + 1, -1).includes(slash);
+}
+
+function isGlobby(str) {
+  if (/\([^()]+$/.test(str)) {
+    return true;
+  }
+  if (str[0] === '{' || str[0] === '[') {
+    return true;
+  }
+  if (/[^\\][{[]/.test(str)) {
+    return true;
+  }
+  return isGlob(str);
+}