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minify.js
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Mon, Nov 18, 20:58

minify.js
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"use strict";
/* eslint-env browser, es6, node */
import {
defaults,
map_from_object,
map_to_object,
HOP,
} from "./utils/index.js";
import { AST_Toplevel } from "./ast.js";
import { parse } from "./parse.js";
import { OutputStream } from "./output.js";
import { Compressor } from "./compress/index.js";
import { base54 } from "./scope.js";
import { SourceMap } from "./sourcemap.js";
import {
mangle_properties,
reserve_quoted_keys,
} from "./propmangle.js";
var to_ascii = typeof atob == "undefined" ? function(b64) {
return Buffer.from(b64, "base64").toString();
} : atob;
var to_base64 = typeof btoa == "undefined" ? function(str) {
return Buffer.from(str).toString("base64");
} : btoa;
function read_source_map(code) {
var match = /(?:^|[^.])\/\/# sourceMappingURL=data:application\/json(;[\w=-]*)?;base64,([+/0-9A-Za-z]*=*)\s*$/.exec(code);
if (!match) {
console.warn("inline source map not found");
return null;
}
return to_ascii(match[2]);
}
function set_shorthand(name, options, keys) {
if (options[name]) {
keys.forEach(function(key) {
if (options[key]) {
if (typeof options[key] != "object") options[key] = {};
if (!(name in options[key])) options[key][name] = options[name];
}
});
}
}
function init_cache(cache) {
if (!cache) return;
if (!("props" in cache)) {
cache.props = new Map();
} else if (!(cache.props instanceof Map)) {
cache.props = map_from_object(cache.props);
}
}
function cache_to_json(cache) {
return {
props: map_to_object(cache.props)
};
}
async function minify(files, options) {
options = defaults(options, {
compress: {},
ecma: undefined,
enclose: false,
ie8: false,
keep_classnames: undefined,
keep_fnames: false,
mangle: {},
module: false,
nameCache: null,
output: null,
format: null,
parse: {},
rename: undefined,
safari10: false,
sourceMap: false,
timings: false,
toplevel: false,
warnings: false,
wrap: false,
}, true);
var timings = options.timings && {
start: Date.now()
};
if (options.keep_classnames === undefined) {
options.keep_classnames = options.keep_fnames;
}
if (options.rename === undefined) {
options.rename = options.compress && options.mangle;
}
if (options.output && options.format) {
throw new Error("Please only specify either output or format option, preferrably format.");
}
options.format = options.format || options.output || {};
set_shorthand("ecma", options, [ "parse", "compress", "format" ]);
set_shorthand("ie8", options, [ "compress", "mangle", "format" ]);
set_shorthand("keep_classnames", options, [ "compress", "mangle" ]);
set_shorthand("keep_fnames", options, [ "compress", "mangle" ]);
set_shorthand("module", options, [ "parse", "compress", "mangle" ]);
set_shorthand("safari10", options, [ "mangle", "format" ]);
set_shorthand("toplevel", options, [ "compress", "mangle" ]);
set_shorthand("warnings", options, [ "compress" ]); // legacy
var quoted_props;
if (options.mangle) {
options.mangle = defaults(options.mangle, {
cache: options.nameCache && (options.nameCache.vars || {}),
eval: false,
ie8: false,
keep_classnames: false,
keep_fnames: false,
module: false,
properties: false,
reserved: [],
safari10: false,
toplevel: false,
}, true);
if (options.mangle.properties) {
if (typeof options.mangle.properties != "object") {
options.mangle.properties = {};
}
if (options.mangle.properties.keep_quoted) {
quoted_props = options.mangle.properties.reserved;
if (!Array.isArray(quoted_props)) quoted_props = [];
options.mangle.properties.reserved = quoted_props;
}
if (options.nameCache && !("cache" in options.mangle.properties)) {
options.mangle.properties.cache = options.nameCache.props || {};
}
}
init_cache(options.mangle.cache);
init_cache(options.mangle.properties.cache);
}
if (options.sourceMap) {
options.sourceMap = defaults(options.sourceMap, {
asObject: false,
content: null,
filename: null,
includeSources: false,
root: null,
url: null,
}, true);
}
if (timings) timings.parse = Date.now();
var toplevel;
if (files instanceof AST_Toplevel) {
toplevel = files;
} else {
if (typeof files == "string") {
files = [ files ];
}
options.parse = options.parse || {};
options.parse.toplevel = null;
for (var name in files) if (HOP(files, name)) {
options.parse.filename = name;
options.parse.toplevel = parse(files[name], options.parse);
if (options.sourceMap && options.sourceMap.content == "inline") {
if (Object.keys(files).length > 1)
throw new Error("inline source map only works with singular input");
options.sourceMap.content = read_source_map(files[name]);
}
}
toplevel = options.parse.toplevel;
}
if (quoted_props && options.mangle.properties.keep_quoted !== "strict") {
reserve_quoted_keys(toplevel, quoted_props);
}
if (options.wrap) {
toplevel = toplevel.wrap_commonjs(options.wrap);
}
if (options.enclose) {
toplevel = toplevel.wrap_enclose(options.enclose);
}
if (timings) timings.rename = Date.now();
// disable rename on harmony due to expand_names bug in for-of loops
// https://github.com/mishoo/UglifyJS2/issues/2794
if (0 && options.rename) {
toplevel.figure_out_scope(options.mangle);
toplevel.expand_names(options.mangle);
}
if (timings) timings.compress = Date.now();
if (options.compress) {
toplevel = new Compressor(options.compress, {
mangle_options: options.mangle
}).compress(toplevel);
}
if (timings) timings.scope = Date.now();
if (options.mangle) toplevel.figure_out_scope(options.mangle);
if (timings) timings.mangle = Date.now();
if (options.mangle) {
base54.reset();
toplevel.compute_char_frequency(options.mangle);
toplevel.mangle_names(options.mangle);
}
if (timings) timings.properties = Date.now();
if (options.mangle && options.mangle.properties) {
toplevel = mangle_properties(toplevel, options.mangle.properties);
}
if (timings) timings.format = Date.now();
var result = {};
if (options.format.ast) {
result.ast = toplevel;
}
if (!HOP(options.format, "code") || options.format.code) {
if (options.sourceMap) {
options.format.source_map = await SourceMap({
file: options.sourceMap.filename,
orig: options.sourceMap.content,
root: options.sourceMap.root
});
if (options.sourceMap.includeSources) {
if (files instanceof AST_Toplevel) {
throw new Error("original source content unavailable");
} else for (var name in files) if (HOP(files, name)) {
options.format.source_map.get().setSourceContent(name, files[name]);
}
}
}
delete options.format.ast;
delete options.format.code;
var stream = OutputStream(options.format);
toplevel.print(stream);
result.code = stream.get();
if (options.sourceMap) {
if(options.sourceMap.asObject) {
result.map = options.format.source_map.get().toJSON();
} else {
result.map = options.format.source_map.toString();
}
if (options.sourceMap.url == "inline") {
var sourceMap = typeof result.map === "object" ? JSON.stringify(result.map) : result.map;
result.code += "\n//# sourceMappingURL=data:application/json;charset=utf-8;base64," + to_base64(sourceMap);
} else if (options.sourceMap.url) {
result.code += "\n//# sourceMappingURL=" + options.sourceMap.url;
}
}
}
if (options.nameCache && options.mangle) {
if (options.mangle.cache) options.nameCache.vars = cache_to_json(options.mangle.cache);
if (options.mangle.properties && options.mangle.properties.cache) {
options.nameCache.props = cache_to_json(options.mangle.properties.cache);
}
}
if (options.format && options.format.source_map) {
options.format.source_map.destroy();
}
if (timings) {
timings.end = Date.now();
result.timings = {
parse: 1e-3 * (timings.rename - timings.parse),
rename: 1e-3 * (timings.compress - timings.rename),
compress: 1e-3 * (timings.scope - timings.compress),
scope: 1e-3 * (timings.mangle - timings.scope),
mangle: 1e-3 * (timings.properties - timings.mangle),
properties: 1e-3 * (timings.format - timings.properties),
format: 1e-3 * (timings.end - timings.format),
total: 1e-3 * (timings.end - timings.start)
};
}
return result;
}
export {
minify,
to_ascii,
};

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