Update with working working version (#12)
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This commit is contained in:
Federico Grandi
589
node_modules/babel-plugin-minify-mangle-names/lib/index.js
generated
vendored
Normal file
589
node_modules/babel-plugin-minify-mangle-names/lib/index.js
generated
vendored
Normal file
@@ -0,0 +1,589 @@
|
||||
"use strict";
|
||||
|
||||
const Charset = require("./charset");
|
||||
|
||||
const ScopeTracker = require("./scope-tracker");
|
||||
|
||||
const isLabelIdentifier = require("./is-label-identifier");
|
||||
|
||||
const bfsTraverseCreator = require("./bfs-traverse");
|
||||
|
||||
const fixupVarScoping = require("./fixup-var-scoping");
|
||||
|
||||
const _require = require("babel-helper-mark-eval-scopes"),
|
||||
markEvalScopes = _require.markEvalScopes,
|
||||
isEvalScopesMarked = _require.isMarked,
|
||||
hasEval = _require.hasEval;
|
||||
|
||||
const newIssueUrl = "https://github.com/babel/minify/issues/new";
|
||||
|
||||
module.exports = babel => {
|
||||
const t = babel.types,
|
||||
traverse = babel.traverse;
|
||||
const bfsTraverse = bfsTraverseCreator(babel);
|
||||
const hop = Object.prototype.hasOwnProperty;
|
||||
|
||||
class Mangler {
|
||||
constructor(charset, program, {
|
||||
exclude = {},
|
||||
keepFnName = false,
|
||||
keepClassName = false,
|
||||
eval: _eval = false,
|
||||
topLevel = false
|
||||
} = {}) {
|
||||
this.charset = charset;
|
||||
this.program = program; // user passed options
|
||||
|
||||
this.exclude = toObject(exclude);
|
||||
this.keepFnName = keepFnName;
|
||||
this.keepClassName = keepClassName;
|
||||
this.topLevel = topLevel;
|
||||
this.eval = _eval; // tracking
|
||||
|
||||
this.visitedScopes = new Set();
|
||||
this.scopeTracker = new ScopeTracker();
|
||||
this.renamedNodes = new Set();
|
||||
}
|
||||
/**
|
||||
* Run the mangler
|
||||
*/
|
||||
|
||||
|
||||
run() {
|
||||
this.crawlScope();
|
||||
this.collect();
|
||||
this.fixup();
|
||||
this.charset.sort();
|
||||
this.mangle();
|
||||
}
|
||||
/**
|
||||
* Tells if a variable name is excluded
|
||||
* @param {String} name
|
||||
*/
|
||||
|
||||
|
||||
isExcluded(name) {
|
||||
return hop.call(this.exclude, name) && this.exclude[name];
|
||||
}
|
||||
/**
|
||||
* Clears traverse cache and recrawls the AST
|
||||
*
|
||||
* to recompute the bindings, references, other scope information
|
||||
* and paths because the other transformations in the same pipeline
|
||||
* (other plugins and presets) changes the AST and does NOT update
|
||||
* the scope objects
|
||||
*/
|
||||
|
||||
|
||||
crawlScope() {
|
||||
(traverse.clearCache || traverse.cache.clear)();
|
||||
this.program.scope.crawl();
|
||||
}
|
||||
/**
|
||||
* Re-crawling comes with a side-effect that let->var conversion
|
||||
* reverts the update of the binding information (block to fn scope).
|
||||
* This function takes care of it by updating it again.
|
||||
*
|
||||
* TODO: This is unnecessary work and needs to be fixed in babel.
|
||||
* https://github.com/babel/babel/issues/4818
|
||||
*
|
||||
* When this is removed, remember to remove fixup's dependency in
|
||||
* ScopeTracker
|
||||
*/
|
||||
|
||||
|
||||
fixup() {
|
||||
fixupVarScoping(this);
|
||||
}
|
||||
/**
|
||||
* A single pass through the AST to collect info for
|
||||
*
|
||||
* 1. Scope Tracker
|
||||
* 2. Unsafe Scopes (direct eval scopes)
|
||||
* 3. Charset considerations for better gzip compression
|
||||
*
|
||||
* Traversed in the same fashion(BFS) the mangling is done
|
||||
*/
|
||||
|
||||
|
||||
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 required because after function name transformation
|
||||
* plugin (part of es2015), the function name is NOT added to the
|
||||
* scope's bindings. So to fix this issue, we simply add a hack to
|
||||
* handle that case - fix it to the scope tree.
|
||||
*
|
||||
* Related:
|
||||
* - https://github.com/babel/minify/issues/829
|
||||
*/
|
||||
BindingIdentifier(path) {
|
||||
if ( // the parent has this id as the name
|
||||
(path.parentPath.isFunctionExpression({
|
||||
id: path.node
|
||||
}) || path.parentPath.isClassExpression({
|
||||
id: path.node
|
||||
})) && // and the id isn't yet added to the scope
|
||||
!hop.call(path.parentPath.scope.bindings, path.node.name)) {
|
||||
path.parentPath.scope.registerBinding("local", path.parentPath);
|
||||
}
|
||||
},
|
||||
|
||||
/**
|
||||
* 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;
|
||||
}
|
||||
} // default
|
||||
|
||||
} catch (err) {
|
||||
_didIteratorError = true;
|
||||
_iteratorError = err;
|
||||
} finally {
|
||||
try {
|
||||
if (!_iteratorNormalCompletion && _iterator.return != null) {
|
||||
_iterator.return();
|
||||
}
|
||||
} finally {
|
||||
if (_didIteratorError) {
|
||||
throw _iteratorError;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
/**
|
||||
* Tells if the name can be mangled in the current observed scope with
|
||||
* the input binding
|
||||
*
|
||||
* @param {string} oldName the old name that needs to be mangled
|
||||
* @param {Binding} binding Binding of the name
|
||||
* @param {Scope} scope The current scope the mangler is run
|
||||
*/
|
||||
|
||||
|
||||
canMangle(oldName, binding, scope) {
|
||||
const cannotMangle = // 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
|
||||
this.isExcluded(oldName) || ( // function names
|
||||
this.keepFnName ? isFunction(binding.path) : false) || ( // class names
|
||||
this.keepClassName ? isClass(binding.path) : false) || // named export
|
||||
this.isExportedWithName(binding);
|
||||
return !cannotMangle;
|
||||
}
|
||||
/**
|
||||
* Tells if the newName can be used as a valid name for the input binding
|
||||
* in the input scope
|
||||
*
|
||||
* @param {string} newName the old name that needs to be mangled
|
||||
* @param {Binding} binding Binding of the name that this new name will replace
|
||||
* @param {Scope} scope The current scope the mangler is run
|
||||
*/
|
||||
|
||||
|
||||
isValidName(newName, binding, scope) {
|
||||
return t.isValidIdentifier(newName) && !this.scopeTracker.hasBinding(scope, newName) && !scope.hasGlobal(newName) && !this.scopeTracker.hasReference(scope, newName) && this.scopeTracker.canUseInReferencedScopes(binding, newName);
|
||||
}
|
||||
/**
|
||||
* Mangle the scope
|
||||
* @param {Scope} scope
|
||||
*/
|
||||
|
||||
|
||||
mangleScope(scope) {
|
||||
const mangler = this;
|
||||
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);
|
||||
const bindings = scopeTracker.bindings.get(scope);
|
||||
const names = [...bindings.keys()]; // A counter to generate names and reset
|
||||
// so we can reuse removed names
|
||||
|
||||
let counter = 0;
|
||||
/**
|
||||
* 1. Iterate through the list of BindingIdentifiers
|
||||
* 2. Rename each of them in-place
|
||||
* 3. Update the scope tree.
|
||||
*
|
||||
* We cannot use a for..of loop over bindings.keys()
|
||||
* because (2) we rename in place and update the bindings
|
||||
* as we traverse through the keys
|
||||
*/
|
||||
|
||||
for (var _i = 0; _i < names.length; _i++) {
|
||||
const oldName = names[_i];
|
||||
const binding = bindings.get(oldName);
|
||||
|
||||
if (mangler.canMangle(oldName, binding, scope)) {
|
||||
let next;
|
||||
|
||||
do {
|
||||
next = mangler.charset.getIdentifier(counter++);
|
||||
} while (!mangler.isValidName(next, binding, scope)); // Reset so variables which are removed can be reused
|
||||
//
|
||||
// the following is an assumtion (for perf)
|
||||
// the length 3 is an assumption that if the oldName isn't
|
||||
// 1 or 2 characters, then probably we are not going to find
|
||||
// a name - because for almost all usecases we have 1 or 2
|
||||
// character new names only. And for the edge cases where
|
||||
// one scope has lots and lots of variables, it's okay to
|
||||
// name something with 3 characters instead of 1
|
||||
|
||||
|
||||
if (oldName.length < 3) {
|
||||
counter = 0;
|
||||
} // 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