2.1/dev/core/src/com/google/gwt/core/ext/linker/impl/permutations.js

/*
 * Copyright 2010 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

  // Deferred-binding mapper function.  Sets a value into the several-level-deep
  // answers map. The keys are specified by a non-zero-length propValArray,
  // which should be a flat array target property values. Used by the generated
  // PERMUTATIONS code.
  //
  function unflattenKeylistIntoAnswers(propValArray, value) {
    var answer = answers;
    for (var i = 0, n = propValArray.length - 1; i < n; ++i) {
      // lazy initialize an empty object for the current key if needed
      answer = answer[propValArray[i]] || (answer[propValArray[i]] = []);
    }
    // set the final one to the value
    answer[propValArray[n]] = value;
  }

  // Computes the value of a given property.  propName must be a valid property
  // name. Used by the generated PERMUTATIONS code.
  //
  function computePropValue(propName) {
    var value = providers[propName](), allowedValuesMap = values[propName];
    if (value in allowedValuesMap) {
      return value;
    }
    var allowedValuesList = [];
    for (var k in allowedValuesMap) {
      allowedValuesList[allowedValuesMap[k]] = k;
    }
    if (propertyErrorFunc) {
      propertyErrorFunc(propName, allowedValuesList, value);
    }
    throw null;
  }