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use Symbol.iterator in for symbol detection and add the conversion of it to the selfContained transformer - @zloirock

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This commit is contained in:
Sebastian McKenzie
2015-02-13 21:05:21 +11:00
parent db36c3a7c2
commit 23b5eeb72f
14 changed files with 41 additions and 20 deletions
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1
lib/6to5/transformation/templates/corejs-is-iterator.js Normal file
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@@ -0,0 +1 @@
CORE_ID.$for.isIterable(VALUE);

8
lib/6to5/transformation/templates/sliced-to-array.js
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@@ -1,14 +1,14 @@
(function (arr, i) {
if (!arr || !arr[Symbol.iterator]) {
throw new TypeError("Invalid attempt to destructure non-iterable instance");
} else if (Array.isArray(arr)) {
if (Array.isArray(arr)) {
return arr;
} else {
} else if (Symbol.iterator in Object(arr)) {
var _arr = [];
for (var _iterator = arr[Symbol.iterator](), _step; !(_step = _iterator.next()).done;) {
_arr.push(_step.value);
if (i && _arr.length === i) break;
}
return _arr;
} else {
throw new TypeError("Invalid attempt to destructure non-iterable instance");
}
});

28
lib/6to5/transformation/transformers/other/self-contained.js
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@@ -40,20 +40,34 @@ var astVisitor = {
} else if (t.isCallExpression(node)) {
// arr[Symbol.iterator]() -> _core.$for.getIterator(arr)
if (node.arguments.length) return;
var callee = node.callee;
if (!t.isMemberExpression(callee)) return;
if (!callee.computed) return;
if (node.arguments.length) return false;
if (!t.isMemberExpression(callee)) return false;
if (!callee.computed) return false;
prop = callee.property;
if (!t.isIdentifier(prop.object, { name: "Symbol" })) return;
if (!t.isIdentifier(prop.property, { name: "iterator" })) return;
if (!t.isIdentifier(prop.object, { name: "Symbol" })) return false;
if (!t.isIdentifier(prop.property, { name: "iterator" })) return false;
return util.template("corejs-iterator", {
CORE_ID: file.get("coreIdentifier"),
VALUE: callee.object
});
} else if (t.isBinaryExpression(node)) {
// Symbol.iterator in arr -> core.$for.isIterable(arr)
if (node.operator !== "in") return;
var left = node.left;
if (!t.isMemberExpression(left)) return;
if (!t.isIdentifier(left.object, { name: "Symbol" })) return;
if (!t.isIdentifier(left.property, { name: "iterator" })) return;
return util.template("corejs-is-iterator", {
CORE_ID: file.get("coreIdentifier"),
VALUE: node.right
});
}
}
};
@@ -83,7 +97,7 @@ exports.pre = function (file) {
};
exports.Identifier = function (node, parent, scope, file) {
if (node.name === "regeneratorRuntime" && t.isReferenced(node, parent)) {
if (t.isReferencedIdentifier(node, parent, { name: "regeneratorRuntime" })) {
return file.get("regeneratorIdentifier");
}
};