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Handle ClassDeclaration binding #383

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merged 3 commits into from Feb 16, 2017
Merged

Handle ClassDeclaration binding #383

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9e640ea
Handle ClassDeclaration binding bug in babel
boopathi Jan 19, 2017
fbf4778
Fix comment
boopathi Feb 12, 2017
0b9d964
New approach to topLevel and classDecl
boopathi Feb 13, 2017
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20 changes: 20 additions & 0 deletions packages/babel-plugin-minify-mangle-names/__tests__/mangle-names-test.js
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Expand Up @@ -1129,4 +1129,24 @@ describe("mangle-names", () => {
`);
expect(transform(source)).toBe(expected);
});

it("should fix issue#365 - classDeclaration with unsafe parent scope", () => {
const source = unpad(`
function foo() {
eval("");
class A {}
class B {}
}
`);
expect(transform(source)).toBe(source);
});

it("should fix classDeclaration with unsafe program scope", () => {
const source = unpad(`
class A {}
class B {}
eval("");
`);
expect(transform(source, { topLevel: true })).toBe(source);
});
});
159 changes: 75 additions & 84 deletions packages/babel-plugin-minify-mangle-names/src/index.js
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Expand Up @@ -86,100 +86,91 @@ module.exports = ({ types: t, traverse }) => {
}
}

mangle() {
mangleScope(scope) {
const mangler = this;

this.program.traverse({
Scopable(path) {
const {scope} = path;
if (!mangler.eval && hasEval(scope)) return;

if (!mangler.eval && hasEval(scope)) return;
if (mangler.visitedScopes.has(scope)) return;
mangler.visitedScopes.add(scope);

if (mangler.visitedScopes.has(scope)) return;
mangler.visitedScopes.add(scope);
let i = 0;
function getNext() {
return mangler.charset.getIdentifier(i++);
}

function hasOwnBinding(name) {
if (scope.parent !== mangler.program.scope) {
return scope.hasOwnBinding(name);
}
return mangler.program.scope.hasOwnBinding(name) || scope.hasOwnBinding(name);
}
// This is useful when we have vars of single character
// => var a, ...z, A, ...Z, $, _;
// to
// => var aa, a, b ,c;
// instead of
// => var aa, ab, ...;
// TODO:
// Re-enable after enabling this feature
// This doesn't work right now as we are concentrating
// on performance improvements
// function resetNext() {
// i = 0;
// }

const bindings = scope.getAllBindings();
const names = Object.keys(bindings);

for (let i = 0; i < names.length; i++) {
const oldName = names[i];
const binding = bindings[oldName];

if (
// arguments
oldName === "arguments"
// other scope bindings
|| !scope.hasOwnBinding(oldName)
// labels
|| binding.path.isLabeledStatement()
// ClassDeclaration has binding in two scopes
// 1. The scope in which it is declared
// 2. The class's own scope
// - https://github.com/babel/babel/issues/5156
|| (binding.path.isClassDeclaration() && binding.path === scope.path)
// blacklisted
|| mangler.isBlacklist(oldName)
// function names
|| (mangler.keepFnName ? isFunction(binding.path) : false)
// class names
|| (mangler.keepClassName ? isClass(binding.path) : false)
) {
continue;
}

let i = 0;
function getNext() {
return mangler.charset.getIdentifier(i++);
}
let next;
do {
next = getNext();
} while (
!t.isValidIdentifier(next)
|| hop.call(bindings, next)
|| scope.hasGlobal(next)
|| scope.hasReference(next)
);

// TODO:
// re-enable this - check above
// resetNext();
mangler.rename(scope, oldName, next);
}
}

// This is useful when we have vars of single character
// => var a, ...z, A, ...Z, $, _;
// to
// => var aa, a, b ,c;
// instead of
// => var aa, ab, ...;
// TODO:
// Re-enable after enabling this feature
// This doesn't work right now as we are concentrating
// on performance improvements
// function resetNext() {
// i = 0;
// }

const bindings = scope.getAllBindings();
const names = Object.keys(bindings);

for (let i = 0; i < names.length; i++) {
const oldName = names[i];
const binding = bindings[oldName];
const isTopLevel = mangler.program.scope.bindings[oldName] === binding;

if (
// already renamed bindings
binding.renamed
// arguments
|| oldName === "arguments"
// globals
|| (mangler.topLevel ? false : isTopLevel)
// other scope bindings
|| !hasOwnBinding(oldName)
// labels
|| binding.path.isLabeledStatement()
// blacklisted
|| mangler.isBlacklist(oldName)
// function names
|| (mangler.keepFnName ? isFunction(binding.path) : false)
// class names
|| (mangler.keepClassName ? isClass(binding.path) : false)
) {
continue;
}
mangle() {
const mangler = this;

let next;
do {
next = getNext();
} while (
!t.isValidIdentifier(next)
|| hop.call(bindings, next)
|| scope.hasGlobal(next)
|| scope.hasReference(next)
);

// TODO:
// re-enable this - check above
// resetNext();
mangler.rename(scope, oldName, next);
if (isTopLevel) {
mangler.rename(mangler.program.scope, oldName, next);
}
// mark the binding as renamed
binding.renamed = true;
}
if (mangler.topLevel) {
mangler.mangleScope(mangler.program.scope);
}

this.program.traverse({
Scopable(path) {
mangler.mangleScope(path.scope);
}
});

// TODO:
// re-enable
// check above
// this.updateReferences();
}

rename(scope, oldName, newName) {
Expand Down