2015-09-15 06:12:46 +01:00

100 lines
2.8 KiB
JavaScript

export default function ({ types: t }) {
function loose(node, body, objId) {
for (var prop of (node.properties: Array)) {
body.push(t.expressionStatement(
t.assignmentExpression(
"=",
t.memberExpression(objId, prop.key, prop.computed || t.isLiteral(prop.key)),
prop.value
)
));
}
}
function spec(node, body, objId, initProps, file) {
// add a simple assignment for all Symbol member expressions due to symbol polyfill limitations
// otherwise use Object.defineProperty
for (let prop of (node.properties: Array)) {
// this wont work with Object.defineProperty
if (t.isLiteral(t.toComputedKey(prop), { value: "__proto__" })) {
initProps.push(prop);
continue;
}
let key = prop.key;
if (t.isIdentifier(key) && !prop.computed) {
key = t.stringLiteral(key.name);
}
var bodyNode = t.callExpression(file.addHelper("define-property"), [objId, key, prop.value]);
body.push(t.expressionStatement(bodyNode));
}
// only one node and it's a Object.defineProperty that returns the object
if (body.length === 1) {
var first = body[0].expression;
if (t.isCallExpression(first)) {
first.arguments[0] = t.objectExpression(initProps);
return first;
}
}
}
return {
visitor: {
ObjectExpression: {
exit({ node, scope, parent }, file) {
var hasComputed = false;
for (let prop of (node.properties: Array)) {
hasComputed = t.isProperty(prop, { computed: true, kind: "init" });
if (hasComputed) break;
}
if (!hasComputed) return;
// put all getters/setters into the first object expression as well as all initialisers up
// to the first computed property
var initProps = [];
var stopInits = false;
node.properties = node.properties.filter(function (prop) {
if (prop.computed) {
stopInits = true;
}
if (prop.kind !== "init" || !stopInits) {
initProps.push(prop);
return false;
} else {
return true;
}
});
var objId = scope.generateUidIdentifierBasedOnNode(parent);
var body = [];
var callback = spec;
if (file.isLoose("es6.properties.computed")) callback = loose;
var result = callback(node, body, objId, initProps, file);
if (result) return result;
body.unshift(t.variableDeclaration("var", [
t.variableDeclarator(objId, t.objectExpression(initProps))
]));
body.push(t.expressionStatement(objId));
return body;
}
}
}
};
}