Code coverage report for 6to5/transformers/destructuring.js

Statements: 100% (93 / 93)      Branches: 100% (38 / 38)      Functions: 100% (14 / 14)      Lines: 100% (84 / 84)      Ignored: none     

All files » 6to5/transformers/ » destructuring.js
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 1531 1 1 1   1 51 4   47           1 60 13 47 16 31 2   29       1 13 25 25   25 6   19         1 16 36   35 35       1 15 6   6       6     15     1   17 17   16 16   2 2       2   2   2   2 2     1 206   206   206 95   5 5 5 5     206   4   4 4     1 311 311   148   2   2 2       2   2     1 314   304   304 304 312 10 10     304   10 11 11 11 10   1       10    
var traverse = require("../traverse");
var util     = require("../util");
var b        = require("acorn-ast-types").builders;
var _        = require("lodash");
 
var buildVariableAssign = function (kind, id, init) {
  if (kind === false) {
    return b.expressionStatement(b.assignmentExpression("=", id, init));
  } else {
    return b.variableDeclaration(kind, [
      b.variableDeclarator(id, init)
    ]);
  }
};
 
var push = function (kind, nodes, elem, parentId) {
  if (elem.type === "ObjectPattern") {
    pushObjectPattern(kind, nodes, elem, parentId);
  } else if (elem.type === "ArrayPattern") {
    pushArrayPattern(kind, nodes, elem, parentId);
  } else if (elem.type === "MemberExpression") {
    nodes.push(buildVariableAssign(false, elem, parentId));
  } else {
    nodes.push(buildVariableAssign(kind, elem, parentId));
  }
};
 
var pushObjectPattern = function (kind, nodes, pattern, parentId) {
  _.each(pattern.properties, function (prop) {
    var pattern2   = prop.value;
    var patternId2 = b.memberExpression(parentId, prop.key, false);
 
    if (traverse.isPattern(pattern2)) {
      push(kind, nodes, pattern2, patternId2);
    } else {
      nodes.push(buildVariableAssign(kind, pattern2, patternId2));
    }
  });
};
 
var pushArrayPattern = function (kind, nodes, pattern, parentId) {
  _.each(pattern.elements, function (elem, i) {
    if (!elem) return;
 
    var newPatternId = b.memberExpression(parentId, b.literal(i), true);
    push(kind, nodes, elem, newPatternId);
  });
};
 
var pushPattern = function (kind, nodes, pattern, parentId, file) {
  if (parentId.type !== "MemberExpression" && parentId.type !== "Identifier") {
    var key = b.identifier(file.generateUid("ref"));
 
    nodes.push(b.variableDeclaration("var", [
      b.variableDeclarator(key, parentId)
    ]));
 
    parentId = key;
  }
 
  push(kind, nodes, pattern, parentId);
};
 
exports.ForInStatement =
exports.ForOfStatement = function (node, parent, file) {
  var declar = node.left;
  if (declar.type !== "VariableDeclaration") return;
 
  var pattern = declar.declarations[0].id;
  if (!traverse.isPattern(pattern)) return;
 
  var key = b.identifier(file.generateUid("ref"));
  node.left = b.variableDeclaration(declar.kind, [
    b.variableDeclarator(key, null)
  ]);
 
  var nodes = [];
 
  push(declar.kind, nodes, pattern, key);
 
  util.ensureBlock(node);
 
  var block = node.body;
  block.body = nodes.concat(block.body);
};
 
exports.Function = function (node, parent, file) {
  var nodes = [];
 
  var hasDestructuring = false;
 
  node.params = node.params.map(function (pattern) {
    if (!traverse.isPattern(pattern)) return pattern;
 
    hasDestructuring = true;
    var parentId = b.identifier(file.generateUid("ref"));
    pushPattern("var", nodes, pattern, parentId, file);
    return parentId;
  });
 
  if (!hasDestructuring) return;
 
  util.ensureBlock(node);
 
  var block = node.body;
  block.body = nodes.concat(block.body);
};
 
exports.ExpressionStatement = function (node, parent, file) {
  var expr = node.expression;
  if (expr.type !== "AssignmentExpression") return;
 
  if (!traverse.isPattern(expr.left)) return;
 
  var nodes = [];
 
  var ref = b.identifier(file.generateUid("ref"));
  nodes.push(b.variableDeclaration("var", [
    b.variableDeclarator(ref, expr.right)
  ]));
 
  push(false, nodes, expr.left, ref);
 
  return nodes;
};
 
exports.VariableDeclaration = function (node, parent, file) {
  if (parent.type === "ForInStatement") return;
 
  var nodes = [];
 
  var hasPattern = false;
  _.each(node.declarations, function (declar) {
    if (traverse.isPattern(declar.id)) {
      hasPattern = true;
      return false;
    }
  });
  if (!hasPattern) return;
 
  _.each(node.declarations, function (declar) {
    var patternId = declar.init;
    var pattern   = declar.id;
    if (traverse.isPattern(pattern) && patternId) {
      pushPattern(node.kind, nodes, pattern, patternId, file);
    } else {
      nodes.push(buildVariableAssign(node.kind, declar.id, declar.init));
    }
  });
 
  return nodes;
};