Code coverage report for 6to5/transformation/transformers/array-comprehension.js

Statements: 100% (34 / 34)      Branches: 100% (12 / 12)      Functions: 100% (4 / 4)      Lines: 100% (32 / 32)      Ignored: none     

All files » 6to5/transformation/transformers/ » array-comprehension.js
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var util = require("../../util");
var t    = require("../../types");
 
var singleArrayExpression = function (node) {
  var block = node.blocks[0];
 
  var templateName = "array-expression-comprehension-map";
  if (node.filter) templateName = "array-expression-comprehension-filter";
 
  var result = util.template(templateName, {
    STATEMENT: node.body,
    FILTER:    node.filter,
    ARRAY:     block.right,
    KEY:       block.left
  });
  result._aliasFunction = true;
  return result;
};
 
var multiple = function (node, file) {
  var uid = file.generateUid("arr");
 
  var container = util.template("array-comprehension-container", {
    KEY: uid
  });
  container._aliasFunction = true;
 
  var block = container.callee.expression.body;
  var body  = block.body;
 
  var returnStatement = body.pop();
 
  var build = function () {
    var self = node.blocks.shift();
    if (!self) return;
 
    var child = build();
    if (!child) {
      // last item
 
      child = util.template("array-push", {
        STATEMENT: node.body,
        KEY:       uid
      }, true);
 
      // add a filter as this is our final stop
      if (node.filter) {
        child = t.ifStatement(node.filter, t.blockStatement([child]));
      }
    }
 
    return t.forOfStatement(
      t.variableDeclaration("var", [t.variableDeclarator(self.left)]),
      self.right,
      t.blockStatement([child])
    );
  };
 
  body.push(build());
  body.push(returnStatement);
 
  return container;
};
 
exports.ComprehensionExpression = function (node, parent, file) {
  if (node.blocks.length === 1 && t.isArrayExpression(node.blocks[0].right)) {
    return singleArrayExpression(node);
  } else {
    return multiple(node, file);
  }
};