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add some packages
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536
node_modules/babel-plugin-minify-mangle-names/lib/index.js
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vendored
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536
node_modules/babel-plugin-minify-mangle-names/lib/index.js
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@@ -0,0 +1,536 @@
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"use strict";
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const Charset = require("./charset");
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const ScopeTracker = require("./scope-tracker");
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const isLabelIdentifier = require("./is-label-identifier");
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const bfsTraverseCreator = require("./bfs-traverse");
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const fixupVarScoping = require("./fixup-var-scoping");
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const _require = require("babel-helper-mark-eval-scopes"),
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markEvalScopes = _require.markEvalScopes,
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isEvalScopesMarked = _require.isMarked,
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hasEval = _require.hasEval;
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const newIssueUrl = "https://github.com/babel/minify/issues/new";
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module.exports = babel => {
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const t = babel.types,
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traverse = babel.traverse;
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const bfsTraverse = bfsTraverseCreator(babel);
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const hop = Object.prototype.hasOwnProperty;
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class Mangler {
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constructor(charset, program, {
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exclude = {},
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keepFnName = false,
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keepClassName = false,
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eval: _eval = false,
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topLevel = false
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} = {}) {
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this.charset = charset;
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this.program = program; // user passed options
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this.exclude = toObject(exclude);
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this.keepFnName = keepFnName;
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this.keepClassName = keepClassName;
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this.topLevel = topLevel;
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this.eval = _eval; // tracking
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this.visitedScopes = new Set();
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this.scopeTracker = new ScopeTracker();
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this.renamedNodes = new Set();
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}
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/**
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* Run the mangler
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*/
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run() {
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this.crawlScope();
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this.collect();
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this.fixup();
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this.charset.sort();
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this.mangle();
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}
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/**
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* Tells if a variable name is excluded
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* @param {String} name
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*/
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||||
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isExcluded(name) {
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return hop.call(this.exclude, name) && this.exclude[name];
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}
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/**
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* Clears traverse cache and recrawls the AST
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*
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* to recompute the bindings, references, other scope information
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* and paths because the other transformations in the same pipeline
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* (other plugins and presets) changes the AST and does NOT update
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* the scope objects
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*/
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||||
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crawlScope() {
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(traverse.clearCache || traverse.cache.clear)();
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this.program.scope.crawl();
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}
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/**
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* Re-crawling comes with a side-effect that let->var conversion
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* reverts the update of the binding information (block to fn scope).
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* This function takes care of it by updating it again.
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*
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* TODO: This is unnecessary work and needs to be fixed in babel.
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* https://github.com/babel/babel/issues/4818
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*
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* When this is removed, remember to remove fixup's dependency in
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* ScopeTracker
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*/
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fixup() {
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fixupVarScoping(this);
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}
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/**
|
||||
* A single pass through the AST to collect info for
|
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*
|
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* 1. Scope Tracker
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* 2. Unsafe Scopes (direct eval scopes)
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* 3. Charset considerations for better gzip compression
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*
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* Traversed in the same fashion(BFS) the mangling is done
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*/
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||||
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||||
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collect() {
|
||||
const mangler = this;
|
||||
const scopeTracker = mangler.scopeTracker;
|
||||
scopeTracker.addScope(this.program.scope);
|
||||
/**
|
||||
* Same usage as in DCE, whichever runs first
|
||||
*/
|
||||
|
||||
if (!isEvalScopesMarked(mangler.program)) {
|
||||
markEvalScopes(mangler.program);
|
||||
}
|
||||
/**
|
||||
* The visitors to be used in traversal.
|
||||
*
|
||||
* Note: BFS traversal supports only the `enter` handlers, `exit`
|
||||
* handlers are simply dropped without Errors
|
||||
*
|
||||
* Collects items defined in the ScopeTracker
|
||||
*/
|
||||
|
||||
|
||||
const collectVisitor = {
|
||||
Scopable({
|
||||
scope
|
||||
}) {
|
||||
scopeTracker.addScope(scope); // Collect bindings defined in the scope
|
||||
|
||||
Object.keys(scope.bindings).forEach(name => {
|
||||
scopeTracker.addBinding(scope.bindings[name]); // add all constant violations as references
|
||||
|
||||
scope.bindings[name].constantViolations.forEach(() => {
|
||||
scopeTracker.addReference(scope, scope.bindings[name], name);
|
||||
});
|
||||
});
|
||||
},
|
||||
|
||||
/**
|
||||
* This is necessary because, in Babel, the scope.references
|
||||
* does NOT contain the references in that scope. Only the program
|
||||
* scope (top most level) contains all the references.
|
||||
*
|
||||
* We collect the references in a fashion where all the scopes between
|
||||
* and including the referenced scope and scope where it is declared
|
||||
* is considered as scope referencing that identifier
|
||||
*/
|
||||
ReferencedIdentifier(path) {
|
||||
if (isLabelIdentifier(path)) {
|
||||
return;
|
||||
}
|
||||
|
||||
const scope = path.scope,
|
||||
name = path.node.name;
|
||||
const binding = scope.getBinding(name);
|
||||
|
||||
if (!binding) {
|
||||
// Do not collect globals as they are already available via
|
||||
// babel's API
|
||||
if (scope.hasGlobal(name)) {
|
||||
return;
|
||||
} // This should NOT happen ultimately. Panic if this code block is
|
||||
// reached
|
||||
|
||||
|
||||
throw new Error(`Binding not found for ReferencedIdentifier "${name}" ` + `present in "${path.parentPath.type}". ` + `Please report this at ${newIssueUrl}`);
|
||||
} else {
|
||||
// Add it to our scope tracker if everything is fine
|
||||
scopeTracker.addReference(scope, binding, name);
|
||||
}
|
||||
}
|
||||
|
||||
};
|
||||
/**
|
||||
* These visitors are for collecting the Characters used in the program
|
||||
* to measure the frequency and generate variable names for mangling so
|
||||
* as to improve the gzip compression - as gzip likes repetition
|
||||
*/
|
||||
|
||||
if (this.charset.shouldConsider) {
|
||||
collectVisitor.Identifier = function Identifer(path) {
|
||||
const node = path.node; // We don't mangle properties, so we collect them as they contribute
|
||||
// to the frequency of characters
|
||||
|
||||
if (path.parentPath.isMemberExpression({
|
||||
property: node
|
||||
}) || path.parentPath.isObjectProperty({
|
||||
key: node
|
||||
})) {
|
||||
mangler.charset.consider(node.name);
|
||||
}
|
||||
};
|
||||
|
||||
collectVisitor.Literal = function Literal({
|
||||
node
|
||||
}) {
|
||||
mangler.charset.consider(String(node.value));
|
||||
};
|
||||
} // Traverse the AST
|
||||
|
||||
|
||||
bfsTraverse(mangler.program, collectVisitor);
|
||||
}
|
||||
/**
|
||||
* Tells if a binding is exported as a NamedExport - so as to NOT mangle
|
||||
*
|
||||
* Babel treats NamedExports as a binding referenced by this NamedExport decl
|
||||
* @param {Binding} binding
|
||||
*/
|
||||
|
||||
|
||||
isExportedWithName(binding) {
|
||||
// short circuit
|
||||
if (!this.topLevel) {
|
||||
return false;
|
||||
}
|
||||
|
||||
const refs = binding.referencePaths;
|
||||
var _iteratorNormalCompletion = true;
|
||||
var _didIteratorError = false;
|
||||
var _iteratorError = undefined;
|
||||
|
||||
try {
|
||||
for (var _iterator = refs[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
|
||||
const ref = _step.value;
|
||||
|
||||
if (ref.isExportNamedDeclaration()) {
|
||||
return true;
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||||
}
|
||||
} // default
|
||||
|
||||
} catch (err) {
|
||||
_didIteratorError = true;
|
||||
_iteratorError = err;
|
||||
} finally {
|
||||
try {
|
||||
if (!_iteratorNormalCompletion && _iterator.return != null) {
|
||||
_iterator.return();
|
||||
}
|
||||
} finally {
|
||||
if (_didIteratorError) {
|
||||
throw _iteratorError;
|
||||
}
|
||||
}
|
||||
}
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||||
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||||
return false;
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||||
}
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||||
/**
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||||
* Mangle the scope
|
||||
* @param {Scope} scope
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||||
*/
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||||
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||||
|
||||
mangleScope(scope) {
|
||||
const mangler = this;
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||||
const scopeTracker = mangler.scopeTracker; // Unsafe Scope
|
||||
|
||||
if (!mangler.eval && hasEval(scope)) {
|
||||
return;
|
||||
} // Already visited
|
||||
// This is because for a function, in Babel, the function and
|
||||
// the function body's BlockStatement has the same scope, and will
|
||||
// be visited twice by the Scopable handler, and we want to mangle
|
||||
// it only once
|
||||
|
||||
|
||||
if (mangler.visitedScopes.has(scope)) {
|
||||
return;
|
||||
}
|
||||
|
||||
mangler.visitedScopes.add(scope); // Helpers to generate names
|
||||
|
||||
let i = 0;
|
||||
|
||||
function getNext() {
|
||||
return mangler.charset.getIdentifier(i++);
|
||||
}
|
||||
|
||||
function resetNext() {
|
||||
i = 0;
|
||||
}
|
||||
|
||||
const bindings = scopeTracker.bindings.get(scope);
|
||||
const names = [...bindings.keys()];
|
||||
/**
|
||||
* 1. Iterate through the list of BindingIdentifiers
|
||||
* 2. Rename each of them in-place
|
||||
* 3. Update the scope tree.
|
||||
*/
|
||||
|
||||
for (let i = 0; i < names.length; i++) {
|
||||
const oldName = names[i];
|
||||
const binding = bindings.get(oldName); // Names which should NOT be mangled
|
||||
|
||||
if ( // arguments - for non-strict mode
|
||||
oldName === "arguments" || // labels
|
||||
binding.path.isLabeledStatement() || // ClassDeclaration has binding in two scopes
|
||||
// 1. The scope in which it is declared
|
||||
// 2. The class's own scope
|
||||
binding.path.isClassDeclaration() && binding.path === scope.path || // excluded
|
||||
mangler.isExcluded(oldName) || ( // function names
|
||||
mangler.keepFnName ? isFunction(binding.path) : false) || ( // class names
|
||||
mangler.keepClassName ? isClass(binding.path) : false) || // named export
|
||||
mangler.isExportedWithName(binding)) {
|
||||
continue;
|
||||
}
|
||||
|
||||
let next;
|
||||
|
||||
do {
|
||||
next = getNext();
|
||||
} while (!t.isValidIdentifier(next) || scopeTracker.hasBinding(scope, next) || scope.hasGlobal(next) || scopeTracker.hasReference(scope, next) || !scopeTracker.canUseInReferencedScopes(binding, next)); // Reset so variables which are removed can be reused
|
||||
|
||||
|
||||
resetNext(); // Once we detected a valid `next` Identifier which could be used,
|
||||
// call the renamer
|
||||
|
||||
mangler.rename(scope, binding, oldName, next);
|
||||
}
|
||||
}
|
||||
/**
|
||||
* The mangle function that traverses through all the Scopes in a BFS
|
||||
* fashion - calls mangleScope
|
||||
*/
|
||||
|
||||
|
||||
mangle() {
|
||||
const mangler = this;
|
||||
bfsTraverse(this.program, {
|
||||
Scopable(path) {
|
||||
if (!path.isProgram() || mangler.topLevel) mangler.mangleScope(path.scope);
|
||||
}
|
||||
|
||||
});
|
||||
}
|
||||
/**
|
||||
* Given a NodePath, collects all the Identifiers which are BindingIdentifiers
|
||||
* and replaces them with the new name
|
||||
*
|
||||
* For example,
|
||||
* var a = 1, { b } = c; // a and b are BindingIdentifiers
|
||||
*
|
||||
* @param {NodePath} path
|
||||
* @param {String} oldName
|
||||
* @param {String} newName
|
||||
* @param {Function} predicate
|
||||
*/
|
||||
|
||||
|
||||
renameBindingIds(path, oldName, newName, predicate = () => true) {
|
||||
const bindingIds = path.getBindingIdentifierPaths(true, false);
|
||||
|
||||
for (const name in bindingIds) {
|
||||
if (name !== oldName) continue;
|
||||
var _iteratorNormalCompletion2 = true;
|
||||
var _didIteratorError2 = false;
|
||||
var _iteratorError2 = undefined;
|
||||
|
||||
try {
|
||||
for (var _iterator2 = bindingIds[name][Symbol.iterator](), _step2; !(_iteratorNormalCompletion2 = (_step2 = _iterator2.next()).done); _iteratorNormalCompletion2 = true) {
|
||||
const idPath = _step2.value;
|
||||
|
||||
if (predicate(idPath)) {
|
||||
idPath.node.name = newName; // babel-7 don't requeue
|
||||
// idPath.replaceWith(t.identifier(newName));
|
||||
|
||||
this.renamedNodes.add(idPath.node);
|
||||
}
|
||||
}
|
||||
} catch (err) {
|
||||
_didIteratorError2 = true;
|
||||
_iteratorError2 = err;
|
||||
} finally {
|
||||
try {
|
||||
if (!_iteratorNormalCompletion2 && _iterator2.return != null) {
|
||||
_iterator2.return();
|
||||
}
|
||||
} finally {
|
||||
if (_didIteratorError2) {
|
||||
throw _iteratorError2;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
/**
|
||||
* The Renamer:
|
||||
* Renames the following for one Binding in a Scope
|
||||
*
|
||||
* 1. Binding in that Scope
|
||||
* 2. All the Binding's constant violations
|
||||
* 3. All its References
|
||||
* 4. Updates mangler.scopeTracker
|
||||
* 5. Updates Babel's Scope tracking
|
||||
*
|
||||
* @param {Scope} scope
|
||||
* @param {Binding} binding
|
||||
* @param {String} oldName
|
||||
* @param {String} newName
|
||||
*/
|
||||
|
||||
|
||||
rename(scope, binding, oldName, newName) {
|
||||
const mangler = this;
|
||||
const scopeTracker = mangler.scopeTracker; // rename at the declaration level
|
||||
|
||||
this.renameBindingIds(binding.path, oldName, newName, idPath => idPath.node === binding.identifier); // update mangler's ScopeTracker
|
||||
|
||||
scopeTracker.renameBinding(scope, oldName, newName); // update all constant violations
|
||||
|
||||
const violations = binding.constantViolations;
|
||||
|
||||
for (let i = 0; i < violations.length; i++) {
|
||||
if (violations[i].isLabeledStatement()) continue;
|
||||
this.renameBindingIds(violations[i], oldName, newName);
|
||||
scopeTracker.updateReference(violations[i].scope, binding, oldName, newName);
|
||||
} // update all referenced places
|
||||
|
||||
|
||||
const refs = binding.referencePaths;
|
||||
|
||||
for (let i = 0; i < refs.length; i++) {
|
||||
const path = refs[i];
|
||||
const node = path.node;
|
||||
|
||||
if (!path.isIdentifier()) {
|
||||
// Ideally, this should not happen
|
||||
// it happens in these places now -
|
||||
// case 1: Export Statements
|
||||
// This is a bug in babel
|
||||
// https://github.com/babel/babel/pull/3629
|
||||
// case 2: Replacements in other plugins
|
||||
// eg: https://github.com/babel/minify/issues/122
|
||||
// replacement in dce from `x` to `!x` gives referencePath as `!x`
|
||||
path.traverse({
|
||||
ReferencedIdentifier(refPath) {
|
||||
if (refPath.node.name !== oldName) {
|
||||
return;
|
||||
}
|
||||
|
||||
const actualBinding = refPath.scope.getBinding(oldName);
|
||||
|
||||
if (actualBinding !== binding) {
|
||||
return;
|
||||
}
|
||||
|
||||
refPath.node.name = newName; // babel-7 don't requeue
|
||||
// refPath.replaceWith(t.identifier(newName));
|
||||
|
||||
mangler.renamedNodes.add(refPath.node);
|
||||
scopeTracker.updateReference(refPath.scope, binding, oldName, newName);
|
||||
}
|
||||
|
||||
});
|
||||
} else if (!isLabelIdentifier(path)) {
|
||||
if (path.node.name === oldName) {
|
||||
path.node.name = newName; // babel-7 don't requeue
|
||||
// path.replaceWith(t.identifier(newName));
|
||||
|
||||
mangler.renamedNodes.add(path.node);
|
||||
scopeTracker.updateReference(path.scope, binding, oldName, newName);
|
||||
} else if (mangler.renamedNodes.has(path.node)) {
|
||||
// already renamed,
|
||||
// just update the references
|
||||
scopeTracker.updateReference(path.scope, binding, oldName, newName);
|
||||
} else {
|
||||
throw new Error(`Unexpected Rename Error: ` + `Trying to replace "${node.name}": from "${oldName}" to "${newName}". ` + `Please report it at ${newIssueUrl}`);
|
||||
}
|
||||
} // else label identifier - silently ignore
|
||||
|
||||
} // update babel's internal tracking
|
||||
|
||||
|
||||
binding.identifier.name = newName; // update babel's internal scope tracking
|
||||
|
||||
const bindings = scope.bindings;
|
||||
bindings[newName] = binding;
|
||||
delete bindings[oldName];
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
return {
|
||||
name: "minify-mangle-names",
|
||||
visitor: {
|
||||
/**
|
||||
* Mangler is run as a single pass. It's the same pattern as used in DCE
|
||||
*/
|
||||
Program: {
|
||||
exit(path) {
|
||||
// If the source code is small then we're going to assume that the user
|
||||
// is running on this on single files before bundling. Therefore we
|
||||
// need to achieve as much determinisim and we will not do any frequency
|
||||
// sorting on the character set. Currently the number is pretty arbitrary.
|
||||
const shouldConsiderSource = path.getSource().length > 70000;
|
||||
const charset = new Charset(shouldConsiderSource);
|
||||
const mangler = new Mangler(charset, path, this.opts);
|
||||
mangler.run();
|
||||
}
|
||||
|
||||
}
|
||||
}
|
||||
};
|
||||
}; // convert value to object
|
||||
|
||||
|
||||
function toObject(value) {
|
||||
if (!Array.isArray(value)) {
|
||||
return value;
|
||||
}
|
||||
|
||||
const map = {};
|
||||
|
||||
for (let i = 0; i < value.length; i++) {
|
||||
map[value[i]] = true;
|
||||
}
|
||||
|
||||
return map;
|
||||
} // for keepFnName
|
||||
|
||||
|
||||
function isFunction(path) {
|
||||
return path.isFunctionExpression() || path.isFunctionDeclaration();
|
||||
} // for keepClassName
|
||||
|
||||
|
||||
function isClass(path) {
|
||||
return path.isClassExpression() || path.isClassDeclaration();
|
||||
}
|
||||
Reference in New Issue
Block a user