/
parseUtils.js
executable file
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/
parseUtils.js
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'use strict';
var fs = require('fs');
var _ = require('lodash');
var acorn = require('acorn');
var walk = require('acorn/dist/walk');
module.exports = {
parseBundle
};
function parseBundle(bundlePath) {
var content = fs.readFileSync(bundlePath, 'utf8');
var ast = acorn.parse(content, {
sourceType: 'script',
// I believe in a bright future of ECMAScript!
// Actually, it's set to `2050` to support the latest ECMAScript version that currently exists.
// Seems like `acorn` supports such weird option value.
ecmaVersion: 2050
});
var walkState = {
locations: null
};
walk.recursive(ast, walkState, {
CallExpression(node, state, c) {
if (state.sizes) return;
var args = node.arguments;
// Additional bundle without webpack loader.
// Modules are stored in second argument, after chunk ids:
// webpackJsonp([<chunks>], <modules>, ...)
// As function name may be changed with `output.jsonpFunction` option we can't rely on it's default name.
if (node.callee.type === 'Identifier' && args.length >= 2 && isArgumentContainsChunkIds(args[0]) && isArgumentContainsModulesList(args[1])) {
state.locations = getModulesLocationFromFunctionArgument(args[1]);
return;
}
// Additional bundle without webpack loader, with module IDs optimized.
// Modules are stored in second arguments Array(n).concat() call
// webpackJsonp([<chunks>], Array([minimum ID]).concat([<module>, <module>, ...]))
// As function name may be changed with `output.jsonpFunction` option we can't rely on it's default name.
if (node.callee.type === 'Identifier' && (args.length === 2 || args.length === 3) && isArgumentContainsChunkIds(args[0]) && isArgumentArrayConcatContainingChunks(args[1])) {
state.locations = getModulesLocationFromArrayConcat(args[1]);
return;
}
// Main bundle with webpack loader
// Modules are stored in first argument:
// (function (...) {...})(<modules>)
if (node.callee.type === 'FunctionExpression' && !node.callee.id && args.length === 1 && isArgumentContainsModulesList(args[0])) {
state.locations = getModulesLocationFromFunctionArgument(args[0]);
return;
}
// Additional bundles with webpack 4 are loaded with:
// (window.webpackJsonp=window.webpackJsonp||[]).push([[chunkId], [<module>, <module>], [[optional_entries]]]);
if (isWindowPropertyPushExpression(node) && args.length === 1 && isArgumentContainingChunkIdsAndModulesList(args[0])) {
state.locations = getModulesLocationFromFunctionArgument(args[0].elements[1]);
return;
}
// Walking into arguments because some of plugins (e.g. `DedupePlugin`) or some Webpack
// features (e.g. `umd` library output) can wrap modules list into additional IIFE.
_.each(args, function (arg) {
return c(arg, state);
});
}
});
if (!walkState.locations) {
return null;
}
return {
src: content,
modules: _.mapValues(walkState.locations, function (loc) {
return content.slice(loc.start, loc.end);
})
};
}
function isArgumentContainsChunkIds(arg) {
// Array of numeric or string ids. Chunk IDs are strings when NamedChunksPlugin is used
return arg.type === 'ArrayExpression' && _.every(arg.elements, isModuleId);
}
function isArgumentContainsModulesList(arg) {
if (arg.type === 'ObjectExpression') {
return _(arg.properties).map('value').every(isModuleWrapper);
}
if (arg.type === 'ArrayExpression') {
// Modules are contained in array.
// Array indexes are module ids
return _.every(arg.elements, function (elem) {
return (
// Some of array items may be skipped because there is no module with such id
!elem || isModuleWrapper(elem)
);
});
}
return false;
}
function isArgumentContainingChunkIdsAndModulesList(arg) {
if (arg.type === 'ArrayExpression' && arg.elements.length >= 2 && isArgumentContainsChunkIds(arg.elements[0]) && isArgumentContainsModulesList(arg.elements[1])) {
return true;
}
return false;
}
function isArgumentArrayConcatContainingChunks(arg) {
if (arg.type === 'CallExpression' && arg.callee.type === 'MemberExpression' &&
// Make sure the object called is `Array(<some number>)`
arg.callee.object.type === 'CallExpression' && arg.callee.object.callee.type === 'Identifier' && arg.callee.object.callee.name === 'Array' && arg.callee.object.arguments.length === 1 && isNumericId(arg.callee.object.arguments[0]) &&
// Make sure the property X called for `Array(<some number>).X` is `concat`
arg.callee.property.type === 'Identifier' && arg.callee.property.name === 'concat' &&
// Make sure exactly one array is passed in to `concat`
arg.arguments.length === 1 && arg.arguments[0].type === 'ArrayExpression') {
// Modules are contained in `Array(<minimum ID>).concat(` array:
// https://github.com/webpack/webpack/blob/v1.14.0/lib/Template.js#L91
// The `<minimum ID>` + array indexes are module ids
return true;
}
return false;
}
function isWindowPropertyPushExpression(node) {
return node.callee.type === 'MemberExpression' && node.callee.property.name === 'push' && node.callee.object.type === 'AssignmentExpression' && node.callee.object.left.object.name === 'window';
}
function isModuleWrapper(node) {
return (
// It's an anonymous function expression that wraps module
(node.type === 'FunctionExpression' || node.type === 'ArrowFunctionExpression') && !node.id ||
// If `DedupePlugin` is used it can be an ID of duplicated module...
isModuleId(node) ||
// or an array of shape [<module_id>, ...args]
node.type === 'ArrayExpression' && node.elements.length > 1 && isModuleId(node.elements[0])
);
}
function isModuleId(node) {
return node.type === 'Literal' && (isNumericId(node) || typeof node.value === 'string');
}
function isNumericId(node) {
return node.type === 'Literal' && Number.isInteger(node.value) && node.value >= 0;
}
function getModulesLocationFromFunctionArgument(arg) {
if (arg.type === 'ObjectExpression') {
var modulesNodes = arg.properties;
return _.transform(modulesNodes, function (result, moduleNode) {
var moduleId = moduleNode.key.name || moduleNode.key.value;
result[moduleId] = getModuleLocation(moduleNode.value);
}, {});
}
if (arg.type === 'ArrayExpression') {
var _modulesNodes = arg.elements;
return _.transform(_modulesNodes, function (result, moduleNode, i) {
if (!moduleNode) return;
result[i] = getModuleLocation(moduleNode);
}, {});
}
return {};
}
function getModulesLocationFromArrayConcat(arg) {
// arg(CallExpression) =
// Array([minId]).concat([<minId module>, <minId+1 module>, ...])
//
// Get the [minId] value from the Array() call first argument literal value
var minId = arg.callee.object.arguments[0].value;
// The modules reside in the `concat()` function call arguments
var modulesNodes = arg.arguments[0].elements;
return _.transform(modulesNodes, function (result, moduleNode, i) {
if (!moduleNode) return;
result[i + minId] = getModuleLocation(moduleNode);
}, {});
}
function getModuleLocation(node) {
return _.pick(node, 'start', 'end');
}