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   1 /**
   2  * @fileoverview Rule to flag labels that are the same as an identifier
   3  * @author Ian Christian Myers
   4  */
   5
   6 "use strict";
   7
   8 //------------------------------------------------------------------------------
   9 // Rule Definition
  10 //------------------------------------------------------------------------------
  11
  12 module.exports = function(context) {
  13
  14     //--------------------------------------------------------------------------
  15     // Helpers
  16     //--------------------------------------------------------------------------
  17
  18     function findIdentifier(scope, identifier) {
  19         var found = false;
  20
  21         scope.variables.forEach(function(variable) {
  22             if (variable.name === identifier) {
  23                 found = true;
  24             }
  25         });
  26
  27         scope.references.forEach(function(reference) {
  28             if (reference.identifier.name === identifier) {
  29                 found = true;
  30             }
  31         });
  32
  33         // If we have not found the identifier in this scope, check the parent
  34         // scope.
  35         if (scope.upper && !found) {
  36             return findIdentifier(scope.upper, identifier);
  37         }
  38
  39         return found;
  40     }
  41
  42     //--------------------------------------------------------------------------
  43     // Public API
  44     //--------------------------------------------------------------------------
  45
  46     return {
  47
  48         "LabeledStatement": function(node) {
  49
  50             // Fetch the innermost scope.
  51             var scope = context.getScope();
  52
  53             // Recursively find the identifier walking up the scope, starting
  54             // with the innermost scope.
  55             if (findIdentifier(scope, node.label.name)) {
  56                 context.report(node, "Found identifier with same name as label.");
  57             }
  58         }
  59
  60     };
  61
  62 };