465 lines
13 KiB
JavaScript
465 lines
13 KiB
JavaScript
'use strict';
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/* eslint-env browser, es6, node */
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import {
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defaults,
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map_from_object,
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map_to_object,
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HOP,
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} from './utils/index.js';
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import { AST_Toplevel, AST_Node, walk, AST_Scope } from './ast.js';
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import { parse } from './parse.js';
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import { OutputStream } from './output.js';
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import { Compressor } from './compress/index.js';
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import { base54 } from './scope.js';
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import { SourceMap } from './sourcemap.js';
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import {
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mangle_properties,
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mangle_private_properties,
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reserve_quoted_keys,
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find_annotated_props,
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} from './propmangle.js';
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// to/from base64 functions
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// Prefer built-in Buffer, if available, then use hack
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// https://developer.mozilla.org/en-US/docs/Glossary/Base64#The_Unicode_Problem
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var to_ascii =
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typeof Buffer !== 'undefined' ?
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(b64) => Buffer.from(b64, 'base64').toString()
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: (b64) => decodeURIComponent(escape(atob(b64)));
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var to_base64 =
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typeof Buffer !== 'undefined' ?
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(str) => Buffer.from(str).toString('base64')
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: (str) => btoa(unescape(encodeURIComponent(str)));
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function read_source_map(code) {
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var match =
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/(?:^|[^.])\/\/# sourceMappingURL=data:application\/json(;[\w=-]*)?;base64,([+/0-9A-Za-z]*=*)\s*$/.exec(
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code
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);
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if (!match) {
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console.warn('inline source map not found');
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return null;
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}
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return to_ascii(match[2]);
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}
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function set_shorthand(name, options, keys) {
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if (options[name]) {
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keys.forEach(function (key) {
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if (options[key]) {
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if (typeof options[key] != 'object') options[key] = {};
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if (!(name in options[key])) options[key][name] = options[name];
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}
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});
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}
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}
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function init_cache(cache) {
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if (!cache) return;
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if (!('props' in cache)) {
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cache.props = new Map();
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} else if (!(cache.props instanceof Map)) {
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cache.props = map_from_object(cache.props);
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}
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}
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function cache_to_json(cache) {
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return {
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props: map_to_object(cache.props),
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};
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}
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function log_input(files, options, fs, debug_folder) {
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if (!(fs && fs.writeFileSync && fs.mkdirSync)) {
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return;
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}
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try {
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fs.mkdirSync(debug_folder);
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} catch (e) {
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if (e.code !== 'EEXIST') throw e;
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}
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const log_path = `${debug_folder}/terser-debug-${(Math.random() * 9999999) | 0}.log`;
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options = options || {};
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const options_str = JSON.stringify(
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options,
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(_key, thing) => {
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if (typeof thing === 'function')
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return '[Function ' + thing.toString() + ']';
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if (thing instanceof RegExp) return '[RegExp ' + thing.toString() + ']';
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return thing;
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},
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4
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);
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const files_str = (file) => {
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if (
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typeof file === 'object' &&
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options.parse &&
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options.parse.spidermonkey
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) {
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return JSON.stringify(file, null, 2);
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} else if (typeof file === 'object') {
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return Object.keys(file)
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.map((key) => key + ': ' + files_str(file[key]))
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.join('\n\n');
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} else if (typeof file === 'string') {
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return '```\n' + file + '\n```';
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} else {
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return file; // What do?
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}
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};
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fs.writeFileSync(
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log_path,
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'Options: \n' +
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options_str +
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'\n\nInput files:\n\n' +
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files_str(files) +
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'\n'
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);
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}
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function* minify_sync_or_async(files, options, _fs_module) {
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if (
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_fs_module &&
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typeof process === 'object' &&
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process.env &&
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typeof process.env.TERSER_DEBUG_DIR === 'string'
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) {
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log_input(files, options, _fs_module, process.env.TERSER_DEBUG_DIR);
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}
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options = defaults(
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options,
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{
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compress: {},
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ecma: undefined,
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enclose: false,
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ie8: false,
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keep_classnames: undefined,
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keep_fnames: false,
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mangle: {},
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module: false,
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nameCache: null,
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output: null,
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format: null,
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parse: {},
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rename: undefined,
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safari10: false,
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sourceMap: false,
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spidermonkey: false,
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timings: false,
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toplevel: false,
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warnings: false,
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wrap: false,
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},
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true
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);
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var timings = options.timings && {
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start: Date.now(),
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};
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if (options.keep_classnames === undefined) {
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options.keep_classnames = options.keep_fnames;
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}
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if (options.rename === undefined) {
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options.rename = options.compress && options.mangle;
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}
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if (options.output && options.format) {
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throw new Error(
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'Please only specify either output or format option, preferrably format.'
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);
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}
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options.format = options.format || options.output || {};
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set_shorthand('ecma', options, ['parse', 'compress', 'format']);
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set_shorthand('ie8', options, ['compress', 'mangle', 'format']);
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set_shorthand('keep_classnames', options, ['compress', 'mangle']);
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set_shorthand('keep_fnames', options, ['compress', 'mangle']);
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set_shorthand('module', options, ['parse', 'compress', 'mangle']);
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set_shorthand('safari10', options, ['mangle', 'format']);
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set_shorthand('toplevel', options, ['compress', 'mangle']);
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set_shorthand('warnings', options, ['compress']); // legacy
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var quoted_props;
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if (options.mangle) {
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options.mangle = defaults(
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options.mangle,
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{
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cache: options.nameCache && (options.nameCache.vars || {}),
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eval: false,
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ie8: false,
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keep_classnames: false,
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keep_fnames: false,
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module: false,
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nth_identifier: base54,
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properties: false,
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reserved: [],
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safari10: false,
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toplevel: false,
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},
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true
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);
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if (options.mangle.properties) {
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if (typeof options.mangle.properties != 'object') {
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options.mangle.properties = {};
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}
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if (options.mangle.properties.keep_quoted) {
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quoted_props = options.mangle.properties.reserved;
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if (!Array.isArray(quoted_props)) quoted_props = [];
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options.mangle.properties.reserved = quoted_props;
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}
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if (options.nameCache && !('cache' in options.mangle.properties)) {
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options.mangle.properties.cache = options.nameCache.props || {};
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}
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}
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init_cache(options.mangle.cache);
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init_cache(options.mangle.properties.cache);
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}
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if (options.sourceMap) {
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options.sourceMap = defaults(
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options.sourceMap,
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{
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asObject: false,
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content: null,
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filename: null,
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includeSources: false,
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root: null,
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url: null,
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},
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true
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);
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}
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// -- Parse phase --
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if (timings) timings.parse = Date.now();
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var toplevel;
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if (files instanceof AST_Toplevel) {
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toplevel = files;
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} else {
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if (
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typeof files == 'string' ||
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(options.parse.spidermonkey && !Array.isArray(files))
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) {
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files = [files];
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}
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options.parse = options.parse || {};
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options.parse.toplevel = null;
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if (options.parse.spidermonkey) {
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options.parse.toplevel = AST_Node.from_mozilla_ast(
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Object.keys(files).reduce(function (toplevel, name) {
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if (!toplevel) return files[name];
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toplevel.body = toplevel.body.concat(files[name].body);
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return toplevel;
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}, null)
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);
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} else {
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delete options.parse.spidermonkey;
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for (var name in files)
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if (HOP(files, name)) {
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options.parse.filename = name;
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options.parse.toplevel = parse(files[name], options.parse);
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if (options.sourceMap && options.sourceMap.content == 'inline') {
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if (Object.keys(files).length > 1)
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throw new Error(
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'inline source map only works with singular input'
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);
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options.sourceMap.content = read_source_map(files[name]);
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}
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}
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}
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if (options.parse.toplevel === null) {
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throw new Error('no source file given');
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}
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toplevel = options.parse.toplevel;
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}
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if (quoted_props && options.mangle.properties.keep_quoted !== 'strict') {
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reserve_quoted_keys(toplevel, quoted_props);
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}
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var annotated_props;
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if (options.mangle && options.mangle.properties) {
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annotated_props = find_annotated_props(toplevel);
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}
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if (options.wrap) {
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toplevel = toplevel.wrap_commonjs(options.wrap);
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}
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if (options.enclose) {
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toplevel = toplevel.wrap_enclose(options.enclose);
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}
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if (timings) timings.rename = Date.now();
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// disable rename on harmony due to expand_names bug in for-of loops
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// https://github.com/mishoo/UglifyJS2/issues/2794
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if (0 && options.rename) {
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toplevel.figure_out_scope(options.mangle);
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toplevel.expand_names(options.mangle);
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}
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// -- Compress phase --
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if (timings) timings.compress = Date.now();
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if (options.compress) {
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toplevel = new Compressor(options.compress, {
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mangle_options: options.mangle,
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}).compress(toplevel);
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}
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// -- Mangle phase --
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if (timings) timings.scope = Date.now();
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if (options.mangle) toplevel.figure_out_scope(options.mangle);
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if (timings) timings.mangle = Date.now();
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if (options.mangle) {
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toplevel.compute_char_frequency(options.mangle);
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toplevel.mangle_names(options.mangle);
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toplevel = mangle_private_properties(toplevel, options.mangle);
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}
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if (timings) timings.properties = Date.now();
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if (options.mangle && options.mangle.properties) {
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toplevel = mangle_properties(
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toplevel,
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options.mangle.properties,
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annotated_props
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);
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}
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// Format phase
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if (timings) timings.format = Date.now();
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var result = {};
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if (options.format.ast) {
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result.ast = toplevel;
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}
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if (options.format.spidermonkey) {
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result.ast = toplevel.to_mozilla_ast();
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}
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let format_options;
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if (!HOP(options.format, 'code') || options.format.code) {
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// Make a shallow copy so that we can modify without mutating the user's input.
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format_options = { ...options.format };
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if (!format_options.ast) {
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// Destroy stuff to save RAM. (unless the deprecated `ast` option is on)
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format_options._destroy_ast = true;
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walk(toplevel, (node) => {
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if (node instanceof AST_Scope) {
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node.variables = undefined;
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node.enclosed = undefined;
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node.parent_scope = undefined;
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}
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if (node.block_scope) {
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node.block_scope.variables = undefined;
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node.block_scope.enclosed = undefined;
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node.block_scope.parent_scope = undefined;
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}
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});
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}
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if (options.sourceMap) {
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if (options.sourceMap.includeSources && files instanceof AST_Toplevel) {
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throw new Error('original source content unavailable');
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}
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format_options.source_map = yield* SourceMap({
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file: options.sourceMap.filename,
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orig: options.sourceMap.content,
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root: options.sourceMap.root,
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files: options.sourceMap.includeSources ? files : null,
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});
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}
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delete format_options.ast;
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delete format_options.code;
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delete format_options.spidermonkey;
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var stream = OutputStream(format_options);
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toplevel.print(stream);
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result.code = stream.get();
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if (options.sourceMap) {
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Object.defineProperty(result, 'map', {
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configurable: true,
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enumerable: true,
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get() {
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const map = format_options.source_map.getEncoded();
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return (result.map =
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options.sourceMap.asObject ? map : JSON.stringify(map));
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},
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set(value) {
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Object.defineProperty(result, 'map', {
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value,
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writable: true,
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});
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},
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});
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result.decoded_map = format_options.source_map.getDecoded();
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if (options.sourceMap.url == 'inline') {
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var sourceMap =
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typeof result.map === 'object' ?
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JSON.stringify(result.map)
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: result.map;
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result.code +=
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'\n//# sourceMappingURL=data:application/json;charset=utf-8;base64,' +
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to_base64(sourceMap);
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} else if (options.sourceMap.url) {
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result.code += '\n//# sourceMappingURL=' + options.sourceMap.url;
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}
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}
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}
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if (options.nameCache && options.mangle) {
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if (options.mangle.cache)
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options.nameCache.vars = cache_to_json(options.mangle.cache);
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if (options.mangle.properties && options.mangle.properties.cache) {
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options.nameCache.props = cache_to_json(options.mangle.properties.cache);
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}
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}
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if (format_options && format_options.source_map) {
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format_options.source_map.destroy();
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}
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if (timings) {
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timings.end = Date.now();
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result.timings = {
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parse: 1e-3 * (timings.rename - timings.parse),
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rename: 1e-3 * (timings.compress - timings.rename),
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compress: 1e-3 * (timings.scope - timings.compress),
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scope: 1e-3 * (timings.mangle - timings.scope),
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mangle: 1e-3 * (timings.properties - timings.mangle),
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properties: 1e-3 * (timings.format - timings.properties),
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format: 1e-3 * (timings.end - timings.format),
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total: 1e-3 * (timings.end - timings.start),
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};
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}
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return result;
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}
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async function minify(files, options, _fs_module) {
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const gen = minify_sync_or_async(files, options, _fs_module);
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let yielded;
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let val;
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do {
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val = gen.next(await yielded);
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yielded = val.value;
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} while (!val.done);
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return val.value;
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}
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function minify_sync(files, options, _fs_module) {
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const gen = minify_sync_or_async(files, options, _fs_module);
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let yielded;
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let val;
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do {
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if (yielded && typeof yielded.then === 'function') {
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throw new Error(
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'minify_sync cannot be used with the legacy source-map module'
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);
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}
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val = gen.next(yielded);
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yielded = val.value;
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} while (!val.done);
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return val.value;
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}
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export { minify, minify_sync, to_ascii };
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