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Destructuring assignments.

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This commit is contained in:
Ingvar Stepanyan 2014-07-25 00:15:58 +03:00 committed by Marijn Haverbeke
parent 5ab6837208
commit 9b697af803
1 changed files with 39 additions and 5 deletions
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44
acorn.js
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@ -1155,7 +1155,8 @@
// to.
function checkLVal(expr) {
if (expr.type !== "Identifier" && expr.type !== "MemberExpression")
if (expr.type !== "Identifier" && expr.type !== "MemberExpression" &&
expr.type !== "ObjectPattern" && expr.type !== "ArrayPattern")
raise(expr.start, "Assigning to rvalue");
if (strict && expr.type === "Identifier" && isStrictBadIdWord(expr.name))
raise(expr.start, "Assigning to " + expr.name + " in strict mode");
@ -1508,8 +1509,8 @@
node.kind = kind;
for (;;) {
var decl = startNode();
decl.id = parseIdent();
if (strict && isStrictBadIdWord(decl.id.name))
decl.id = options.ecmaVersion >= 6 ? toAssignable(parseExprAtom()) : parseIdent();
if (strict && decl.id.type === "Identifier" && isStrictBadIdWord(decl.id.name))
raise(decl.id.start, "Binding " + decl.id.name + " in strict mode");
decl.init = eat(_eq) ? parseExpression(true, noIn) : (kind === _const.keyword ? unexpected() : null);
node.declarations.push(finishNode(decl, "VariableDeclarator"));
@ -1910,22 +1911,31 @@
// Parse function parameters.
function parseFunctionParams(node) {
var defaults = [], hasDefaults = false;
expect(_parenL);
for (;;) {
if (eat(_parenR)) {
break;
} else if (options.ecmaVersion >= 6 && eat(_ellipsis)) {
node.rest = parseIdent();
node.rest = toAssignable(parseExprAtom());
expect(_parenR);
break;
} else {
node.params.push(parseIdent());
node.params.push(options.ecmaVersion >= 6 ? toAssignable(parseExprAtom()) : parseIdent());
if (options.ecmaVersion >= 6 && tokVal === '=') {
next();
hasDefaults = true;
defaults.push(parseExpression(true));
}
if (!eat(_comma)) {
expect(_parenR);
break;
}
}
}
if (hasDefaults) node.defaults = defaults;
}
// Parse function body and check parameters.
@ -2043,4 +2053,28 @@
return finishNode(node, "Identifier");
}
// Convert existing expression atom to assignable pattern
// if possible.
function toAssignable(node) {
if (options.ecmaVersion >= 6) {
switch (node.type) {
case "Identifier":
break;
case "ObjectExpression":
node.type = "ObjectPattern";
break;
case "ArrayExpression":
node.type = "ArrayPattern";
break;
default:
unexpected(node.start);
}
}
return node;
}
});