| 1 | "use strict";
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| 2 | /* eslint-env browser, es6, node */
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| 3 |
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| 4 | import {
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| 5 | defaults,
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| 6 | map_from_object,
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| 7 | map_to_object,
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| 8 | HOP,
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| 9 | } from "./utils/index.js";
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| 10 | import { AST_Toplevel, AST_Node, walk, AST_Scope } from "./ast.js";
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| 11 | import { parse } from "./parse.js";
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| 12 | import { OutputStream } from "./output.js";
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| 13 | import { Compressor } from "./compress/index.js";
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| 14 | import { base54 } from "./scope.js";
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| 15 | import { SourceMap } from "./sourcemap.js";
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| 16 | import {
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| 17 | mangle_properties,
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| 18 | mangle_private_properties,
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| 19 | reserve_quoted_keys,
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| 20 | find_annotated_props,
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| 21 | } from "./propmangle.js";
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| 22 |
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| 23 | // to/from base64 functions
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| 24 | // Prefer built-in Buffer, if available, then use hack
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| 25 | // https://developer.mozilla.org/en-US/docs/Glossary/Base64#The_Unicode_Problem
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| 26 | var to_ascii = typeof Buffer !== "undefined"
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| 27 | ? (b64) => Buffer.from(b64, "base64").toString()
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| 28 | : (b64) => decodeURIComponent(escape(atob(b64)));
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| 29 | var to_base64 = typeof Buffer !== "undefined"
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| 30 | ? (str) => Buffer.from(str).toString("base64")
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| 31 | : (str) => btoa(unescape(encodeURIComponent(str)));
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| 32 |
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| 33 | function read_source_map(code) {
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| 34 | var match = /(?:^|[^.])\/\/# sourceMappingURL=data:application\/json(;[\w=-]*)?;base64,([+/0-9A-Za-z]*=*)\s*$/.exec(code);
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| 35 | if (!match) {
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| 36 | console.warn("inline source map not found");
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| 37 | return null;
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| 38 | }
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| 39 | return to_ascii(match[2]);
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| 40 | }
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| 41 |
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| 42 | function set_shorthand(name, options, keys) {
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| 43 | if (options[name]) {
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| 44 | keys.forEach(function(key) {
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| 45 | if (options[key]) {
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| 46 | if (typeof options[key] != "object") options[key] = {};
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| 47 | if (!(name in options[key])) options[key][name] = options[name];
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| 48 | }
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| 49 | });
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| 50 | }
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| 51 | }
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| 52 |
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| 53 | function init_cache(cache) {
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| 54 | if (!cache) return;
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| 55 | if (!("props" in cache)) {
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| 56 | cache.props = new Map();
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| 57 | } else if (!(cache.props instanceof Map)) {
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| 58 | cache.props = map_from_object(cache.props);
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| 59 | }
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| 60 | }
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| 61 |
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| 62 | function cache_to_json(cache) {
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| 63 | return {
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| 64 | props: map_to_object(cache.props)
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| 65 | };
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| 66 | }
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| 67 |
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| 68 | function log_input(files, options, fs, debug_folder) {
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| 69 | if (!(fs && fs.writeFileSync && fs.mkdirSync)) {
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| 70 | return;
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| 71 | }
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| 72 |
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| 73 | try {
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| 74 | fs.mkdirSync(debug_folder);
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| 75 | } catch (e) {
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| 76 | if (e.code !== "EEXIST") throw e;
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| 77 | }
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| 78 |
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| 79 | const log_path = `${debug_folder}/terser-debug-${(Math.random() * 9999999) | 0}.log`;
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| 80 |
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| 81 | options = options || {};
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| 82 |
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| 83 | const options_str = JSON.stringify(options, (_key, thing) => {
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| 84 | if (typeof thing === "function") return "[Function " + thing.toString() + "]";
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| 85 | if (thing instanceof RegExp) return "[RegExp " + thing.toString() + "]";
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| 86 | return thing;
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| 87 | }, 4);
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| 88 |
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| 89 | const files_str = (file) => {
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| 90 | if (typeof file === "object" && options.parse && options.parse.spidermonkey) {
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| 91 | return JSON.stringify(file, null, 2);
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| 92 | } else if (typeof file === "object") {
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| 93 | return Object.keys(file)
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| 94 | .map((key) => key + ": " + files_str(file[key]))
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| 95 | .join("\n\n");
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| 96 | } else if (typeof file === "string") {
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| 97 | return "```\n" + file + "\n```";
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| 98 | } else {
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| 99 | return file; // What do?
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| 100 | }
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| 101 | };
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| 102 |
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| 103 | fs.writeFileSync(log_path, "Options: \n" + options_str + "\n\nInput files:\n\n" + files_str(files) + "\n");
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| 104 | }
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| 105 |
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| 106 | function* minify_sync_or_async(files, options, _fs_module) {
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| 107 | if (
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| 108 | _fs_module
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| 109 | && typeof process === "object"
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| 110 | && process.env
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| 111 | && typeof process.env.TERSER_DEBUG_DIR === "string"
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| 112 | ) {
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| 113 | log_input(files, options, _fs_module, process.env.TERSER_DEBUG_DIR);
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| 114 | }
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| 115 |
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| 116 | options = defaults(options, {
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| 117 | compress: {},
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| 118 | ecma: undefined,
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| 119 | enclose: false,
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| 120 | ie8: false,
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| 121 | keep_classnames: undefined,
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| 122 | keep_fnames: false,
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| 123 | mangle: {},
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| 124 | module: false,
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| 125 | nameCache: null,
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| 126 | output: null,
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| 127 | format: null,
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| 128 | parse: {},
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| 129 | rename: undefined,
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| 130 | safari10: false,
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| 131 | sourceMap: false,
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| 132 | spidermonkey: false,
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| 133 | timings: false,
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| 134 | toplevel: false,
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| 135 | warnings: false,
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| 136 | wrap: false,
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| 137 | }, true);
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| 138 |
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| 139 | var timings = options.timings && {
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| 140 | start: Date.now()
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| 141 | };
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| 142 | if (options.keep_classnames === undefined) {
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| 143 | options.keep_classnames = options.keep_fnames;
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| 144 | }
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| 145 | if (options.rename === undefined) {
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| 146 | options.rename = options.compress && options.mangle;
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| 147 | }
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| 148 | if (options.output && options.format) {
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| 149 | throw new Error("Please only specify either output or format option, preferrably format.");
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| 150 | }
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| 151 | options.format = options.format || options.output || {};
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| 152 | set_shorthand("ecma", options, [ "parse", "compress", "format" ]);
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| 153 | set_shorthand("ie8", options, [ "compress", "mangle", "format" ]);
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| 154 | set_shorthand("keep_classnames", options, [ "compress", "mangle" ]);
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| 155 | set_shorthand("keep_fnames", options, [ "compress", "mangle" ]);
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| 156 | set_shorthand("module", options, [ "parse", "compress", "mangle" ]);
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| 157 | set_shorthand("safari10", options, [ "mangle", "format" ]);
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| 158 | set_shorthand("toplevel", options, [ "compress", "mangle" ]);
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| 159 | set_shorthand("warnings", options, [ "compress" ]); // legacy
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| 160 | var quoted_props;
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| 161 | if (options.mangle) {
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| 162 | options.mangle = defaults(options.mangle, {
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| 163 | cache: options.nameCache && (options.nameCache.vars || {}),
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| 164 | eval: false,
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| 165 | ie8: false,
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| 166 | keep_classnames: false,
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| 167 | keep_fnames: false,
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| 168 | module: false,
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| 169 | nth_identifier: base54,
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| 170 | properties: false,
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| 171 | reserved: [],
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| 172 | safari10: false,
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| 173 | toplevel: false,
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| 174 | }, true);
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| 175 | if (options.mangle.properties) {
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| 176 | if (typeof options.mangle.properties != "object") {
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| 177 | options.mangle.properties = {};
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| 178 | }
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| 179 | if (options.mangle.properties.keep_quoted) {
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| 180 | quoted_props = options.mangle.properties.reserved;
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| 181 | if (!Array.isArray(quoted_props)) quoted_props = [];
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| 182 | options.mangle.properties.reserved = quoted_props;
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| 183 | }
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| 184 | if (options.nameCache && !("cache" in options.mangle.properties)) {
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| 185 | options.mangle.properties.cache = options.nameCache.props || {};
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| 186 | }
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| 187 | }
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| 188 | init_cache(options.mangle.cache);
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| 189 | init_cache(options.mangle.properties.cache);
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| 190 | }
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| 191 | if (options.sourceMap) {
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| 192 | options.sourceMap = defaults(options.sourceMap, {
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| 193 | asObject: false,
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| 194 | content: null,
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| 195 | filename: null,
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| 196 | includeSources: false,
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| 197 | root: null,
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| 198 | url: null,
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| 199 | }, true);
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| 200 | }
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| 201 |
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| 202 | // -- Parse phase --
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| 203 | if (timings) timings.parse = Date.now();
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| 204 | var toplevel;
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| 205 | if (files instanceof AST_Toplevel) {
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| 206 | toplevel = files;
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| 207 | } else {
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| 208 | if (typeof files == "string" || (options.parse.spidermonkey && !Array.isArray(files))) {
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| 209 | files = [ files ];
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| 210 | }
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| 211 | options.parse = options.parse || {};
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| 212 | options.parse.toplevel = null;
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| 213 |
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| 214 | if (options.parse.spidermonkey) {
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| 215 | options.parse.toplevel = AST_Node.from_mozilla_ast(Object.keys(files).reduce(function(toplevel, name) {
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| 216 | if (!toplevel) return files[name];
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| 217 | toplevel.body = toplevel.body.concat(files[name].body);
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| 218 | return toplevel;
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| 219 | }, null));
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| 220 | } else {
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| 221 | delete options.parse.spidermonkey;
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| 222 |
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| 223 | for (var name in files) if (HOP(files, name)) {
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| 224 | options.parse.filename = name;
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| 225 | options.parse.toplevel = parse(files[name], options.parse);
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| 226 | if (options.sourceMap && options.sourceMap.content == "inline") {
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| 227 | if (Object.keys(files).length > 1)
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| 228 | throw new Error("inline source map only works with singular input");
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| 229 | options.sourceMap.content = read_source_map(files[name]);
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| 230 | }
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| 231 | }
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| 232 | }
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| 233 | if (options.parse.toplevel === null) {
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| 234 | throw new Error("no source file given");
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| 235 | }
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| 236 |
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| 237 | toplevel = options.parse.toplevel;
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| 238 | }
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| 239 | if (quoted_props && options.mangle.properties.keep_quoted !== "strict") {
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| 240 | reserve_quoted_keys(toplevel, quoted_props);
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| 241 | }
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| 242 | var annotated_props;
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| 243 | if (options.mangle && options.mangle.properties) {
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| 244 | annotated_props = find_annotated_props(toplevel);
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| 245 | }
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| 246 | if (options.wrap) {
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| 247 | toplevel = toplevel.wrap_commonjs(options.wrap);
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| 248 | }
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| 249 | if (options.enclose) {
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| 250 | toplevel = toplevel.wrap_enclose(options.enclose);
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| 251 | }
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| 252 | if (timings) timings.rename = Date.now();
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| 253 | // disable rename on harmony due to expand_names bug in for-of loops
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| 254 | // https://github.com/mishoo/UglifyJS2/issues/2794
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| 255 | if (0 && options.rename) {
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| 256 | toplevel.figure_out_scope(options.mangle);
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| 257 | toplevel.expand_names(options.mangle);
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| 258 | }
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| 259 |
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| 260 | // -- Compress phase --
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| 261 | if (timings) timings.compress = Date.now();
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| 262 | if (options.compress) {
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| 263 | toplevel = new Compressor(options.compress, {
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| 264 | mangle_options: options.mangle
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| 265 | }).compress(toplevel);
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| 266 | }
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| 267 |
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| 268 | // -- Mangle phase --
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| 269 | if (timings) timings.scope = Date.now();
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| 270 | if (options.mangle) toplevel.figure_out_scope(options.mangle);
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| 271 | if (timings) timings.mangle = Date.now();
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| 272 | if (options.mangle) {
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| 273 | toplevel.compute_char_frequency(options.mangle);
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| 274 | toplevel.mangle_names(options.mangle);
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| 275 | toplevel = mangle_private_properties(toplevel, options.mangle);
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| 276 | }
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| 277 | if (timings) timings.properties = Date.now();
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| 278 | if (options.mangle && options.mangle.properties) {
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| 279 | toplevel = mangle_properties(toplevel, options.mangle.properties, annotated_props);
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| 280 | }
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| 281 |
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| 282 | // Format phase
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| 283 | if (timings) timings.format = Date.now();
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| 284 | var result = {};
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| 285 | if (options.format.ast) {
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| 286 | result.ast = toplevel;
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| 287 | }
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| 288 | if (options.format.spidermonkey) {
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| 289 | result.ast = toplevel.to_mozilla_ast();
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| 290 | }
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| 291 | let format_options;
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| 292 | if (!HOP(options.format, "code") || options.format.code) {
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| 293 | // Make a shallow copy so that we can modify without mutating the user's input.
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| 294 | format_options = {...options.format};
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| 295 | if (!format_options.ast) {
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| 296 | // Destroy stuff to save RAM. (unless the deprecated `ast` option is on)
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| 297 | format_options._destroy_ast = true;
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| 298 |
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| 299 | walk(toplevel, node => {
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| 300 | if (node instanceof AST_Scope) {
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| 301 | node.variables = undefined;
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| 302 | node.enclosed = undefined;
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| 303 | node.parent_scope = undefined;
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| 304 | }
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| 305 | if (node.block_scope) {
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| 306 | node.block_scope.variables = undefined;
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| 307 | node.block_scope.enclosed = undefined;
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| 308 | node.block_scope.parent_scope = undefined;
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| 309 | }
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| 310 | });
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| 311 | }
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| 312 |
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| 313 | if (options.sourceMap) {
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| 314 | if (options.sourceMap.includeSources && files instanceof AST_Toplevel) {
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| 315 | throw new Error("original source content unavailable");
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| 316 | }
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| 317 | format_options.source_map = yield* SourceMap({
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| 318 | file: options.sourceMap.filename,
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| 319 | orig: options.sourceMap.content,
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| 320 | root: options.sourceMap.root,
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| 321 | files: options.sourceMap.includeSources ? files : null,
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| 322 | });
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| 323 | }
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| 324 | delete format_options.ast;
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| 325 | delete format_options.code;
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| 326 | delete format_options.spidermonkey;
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| 327 | var stream = OutputStream(format_options);
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| 328 | toplevel.print(stream);
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| 329 | result.code = stream.get();
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| 330 | if (options.sourceMap) {
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| 331 | Object.defineProperty(result, "map", {
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| 332 | configurable: true,
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| 333 | enumerable: true,
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| 334 | get() {
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| 335 | const map = format_options.source_map.getEncoded();
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| 336 | return (result.map = options.sourceMap.asObject ? map : JSON.stringify(map));
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| 337 | },
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| 338 | set(value) {
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| 339 | Object.defineProperty(result, "map", {
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| 340 | value,
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| 341 | writable: true,
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| 342 | });
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| 343 | }
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| 344 | });
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| 345 | result.decoded_map = format_options.source_map.getDecoded();
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| 346 | if (options.sourceMap.url == "inline") {
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| 347 | var sourceMap = typeof result.map === "object" ? JSON.stringify(result.map) : result.map;
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| 348 | result.code += "\n//# sourceMappingURL=data:application/json;charset=utf-8;base64," + to_base64(sourceMap);
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| 349 | } else if (options.sourceMap.url) {
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| 350 | result.code += "\n//# sourceMappingURL=" + options.sourceMap.url;
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| 351 | }
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| 352 | }
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| 353 | }
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| 354 | if (options.nameCache && options.mangle) {
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| 355 | if (options.mangle.cache) options.nameCache.vars = cache_to_json(options.mangle.cache);
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| 356 | if (options.mangle.properties && options.mangle.properties.cache) {
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| 357 | options.nameCache.props = cache_to_json(options.mangle.properties.cache);
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| 358 | }
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| 359 | }
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| 360 | if (format_options && format_options.source_map) {
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| 361 | format_options.source_map.destroy();
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| 362 | }
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| 363 | if (timings) {
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| 364 | timings.end = Date.now();
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| 365 | result.timings = {
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| 366 | parse: 1e-3 * (timings.rename - timings.parse),
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| 367 | rename: 1e-3 * (timings.compress - timings.rename),
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| 368 | compress: 1e-3 * (timings.scope - timings.compress),
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| 369 | scope: 1e-3 * (timings.mangle - timings.scope),
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| 370 | mangle: 1e-3 * (timings.properties - timings.mangle),
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| 371 | properties: 1e-3 * (timings.format - timings.properties),
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| 372 | format: 1e-3 * (timings.end - timings.format),
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| 373 | total: 1e-3 * (timings.end - timings.start)
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| 374 | };
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| 375 | }
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| 376 | return result;
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| 377 | }
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| 378 |
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| 379 | async function minify(files, options, _fs_module) {
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| 380 | const gen = minify_sync_or_async(files, options, _fs_module);
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| 381 |
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| 382 | let yielded;
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| 383 | let val;
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| 384 | do {
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| 385 | val = gen.next(await yielded);
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| 386 | yielded = val.value;
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| 387 | } while (!val.done);
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| 388 |
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| 389 | return val.value;
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| 390 | }
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| 391 |
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| 392 | function minify_sync(files, options, _fs_module) {
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| 393 | const gen = minify_sync_or_async(files, options, _fs_module);
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| 394 |
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| 395 | let yielded;
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| 396 | let val;
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| 397 | do {
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| 398 | if (yielded && typeof yielded.then === "function") {
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| 399 | throw new Error("minify_sync cannot be used with the legacy source-map module");
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| 400 | }
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| 401 | val = gen.next(yielded);
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| 402 | yielded = val.value;
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| 403 | } while (!val.done);
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| 404 |
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| 405 | return val.value;
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| 406 | }
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| 407 |
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| 408 | export {
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| 409 | minify,
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| 410 | minify_sync,
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| 411 | to_ascii,
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| 412 | };
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