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authorMinteck <contact@minteck.org>2021-12-21 16:52:28 +0100
committerMinteck <contact@minteck.org>2021-12-21 16:52:28 +0100
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treec53c2f826f777f9d6b2d249dab556feb72a6c3a6 /src/node_modules/terser/lib/propmangle.js
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+/***********************************************************************
+
+ A JavaScript tokenizer / parser / beautifier / compressor.
+ https://github.com/mishoo/UglifyJS2
+
+ -------------------------------- (C) ---------------------------------
+
+ Author: Mihai Bazon
+ <mihai.bazon@gmail.com>
+ http://mihai.bazon.net/blog
+
+ Distributed under the BSD license:
+
+ Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+
+ * Redistributions of source code must retain the above
+ copyright notice, this list of conditions and the following
+ disclaimer.
+
+ * Redistributions in binary form must reproduce the above
+ copyright notice, this list of conditions and the following
+ disclaimer in the documentation and/or other materials
+ provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
+ EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
+ LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+ OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+ THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ SUCH DAMAGE.
+
+ ***********************************************************************/
+
+"use strict";
+/* global global, self */
+
+import {
+ defaults,
+ push_uniq,
+} from "./utils/index.js";
+import { base54 } from "./scope.js";
+import {
+ AST_Binary,
+ AST_Call,
+ AST_Conditional,
+ AST_Dot,
+ AST_ObjectKeyVal,
+ AST_ObjectProperty,
+ AST_Sequence,
+ AST_String,
+ AST_Sub,
+ TreeTransformer,
+ TreeWalker,
+} from "./ast.js";
+import { domprops } from "../tools/domprops.js";
+
+function find_builtins(reserved) {
+ domprops.forEach(add);
+
+ // Compatibility fix for some standard defined globals not defined on every js environment
+ var new_globals = ["Symbol", "Map", "Promise", "Proxy", "Reflect", "Set", "WeakMap", "WeakSet"];
+ var objects = {};
+ var global_ref = typeof global === "object" ? global : self;
+
+ new_globals.forEach(function (new_global) {
+ objects[new_global] = global_ref[new_global] || new Function();
+ });
+
+ [
+ "null",
+ "true",
+ "false",
+ "NaN",
+ "Infinity",
+ "-Infinity",
+ "undefined",
+ ].forEach(add);
+ [ Object, Array, Function, Number,
+ String, Boolean, Error, Math,
+ Date, RegExp, objects.Symbol, ArrayBuffer,
+ DataView, decodeURI, decodeURIComponent,
+ encodeURI, encodeURIComponent, eval, EvalError,
+ Float32Array, Float64Array, Int8Array, Int16Array,
+ Int32Array, isFinite, isNaN, JSON, objects.Map, parseFloat,
+ parseInt, objects.Promise, objects.Proxy, RangeError, ReferenceError,
+ objects.Reflect, objects.Set, SyntaxError, TypeError, Uint8Array,
+ Uint8ClampedArray, Uint16Array, Uint32Array, URIError,
+ objects.WeakMap, objects.WeakSet
+ ].forEach(function(ctor) {
+ Object.getOwnPropertyNames(ctor).map(add);
+ if (ctor.prototype) {
+ Object.getOwnPropertyNames(ctor.prototype).map(add);
+ }
+ });
+ function add(name) {
+ reserved.add(name);
+ }
+}
+
+function reserve_quoted_keys(ast, reserved) {
+ function add(name) {
+ push_uniq(reserved, name);
+ }
+
+ ast.walk(new TreeWalker(function(node) {
+ if (node instanceof AST_ObjectKeyVal && node.quote) {
+ add(node.key);
+ } else if (node instanceof AST_ObjectProperty && node.quote) {
+ add(node.key.name);
+ } else if (node instanceof AST_Sub) {
+ addStrings(node.property, add);
+ }
+ }));
+}
+
+function addStrings(node, add) {
+ node.walk(new TreeWalker(function(node) {
+ if (node instanceof AST_Sequence) {
+ addStrings(node.tail_node(), add);
+ } else if (node instanceof AST_String) {
+ add(node.value);
+ } else if (node instanceof AST_Conditional) {
+ addStrings(node.consequent, add);
+ addStrings(node.alternative, add);
+ }
+ return true;
+ }));
+}
+
+function mangle_properties(ast, options) {
+ options = defaults(options, {
+ builtins: false,
+ cache: null,
+ debug: false,
+ keep_quoted: false,
+ only_cache: false,
+ regex: null,
+ reserved: null,
+ undeclared: false,
+ }, true);
+
+ var reserved_option = options.reserved;
+ if (!Array.isArray(reserved_option)) reserved_option = [reserved_option];
+ var reserved = new Set(reserved_option);
+ if (!options.builtins) find_builtins(reserved);
+
+ var cname = -1;
+ var cache;
+ if (options.cache) {
+ cache = options.cache.props;
+ cache.forEach(function(mangled_name) {
+ reserved.add(mangled_name);
+ });
+ } else {
+ cache = new Map();
+ }
+
+ var regex = options.regex && new RegExp(options.regex);
+
+ // note debug is either false (disabled), or a string of the debug suffix to use (enabled).
+ // note debug may be enabled as an empty string, which is falsey. Also treat passing 'true'
+ // the same as passing an empty string.
+ var debug = options.debug !== false;
+ var debug_name_suffix;
+ if (debug) {
+ debug_name_suffix = (options.debug === true ? "" : options.debug);
+ }
+
+ var names_to_mangle = new Set();
+ var unmangleable = new Set();
+
+ var keep_quoted_strict = options.keep_quoted === "strict";
+
+ // step 1: find candidates to mangle
+ ast.walk(new TreeWalker(function(node) {
+ if (node instanceof AST_ObjectKeyVal) {
+ if (typeof node.key == "string" &&
+ (!keep_quoted_strict || !node.quote)) {
+ add(node.key);
+ }
+ } else if (node instanceof AST_ObjectProperty) {
+ // setter or getter, since KeyVal is handled above
+ if (!keep_quoted_strict || !node.key.end.quote) {
+ add(node.key.name);
+ }
+ } else if (node instanceof AST_Dot) {
+ var declared = !!options.undeclared;
+ if (!declared) {
+ var root = node;
+ while (root.expression) {
+ root = root.expression;
+ }
+ declared = !(root.thedef && root.thedef.undeclared);
+ }
+ if (declared &&
+ (!keep_quoted_strict || !node.quote)) {
+ add(node.property);
+ }
+ } else if (node instanceof AST_Sub) {
+ if (!keep_quoted_strict) {
+ addStrings(node.property, add);
+ }
+ } else if (node instanceof AST_Call
+ && node.expression.print_to_string() == "Object.defineProperty") {
+ addStrings(node.args[1], add);
+ } else if (node instanceof AST_Binary && node.operator === "in") {
+ addStrings(node.left, add);
+ }
+ }));
+
+ // step 2: transform the tree, renaming properties
+ return ast.transform(new TreeTransformer(function(node) {
+ if (node instanceof AST_ObjectKeyVal) {
+ if (typeof node.key == "string" &&
+ (!keep_quoted_strict || !node.quote)) {
+ node.key = mangle(node.key);
+ }
+ } else if (node instanceof AST_ObjectProperty) {
+ // setter, getter, method or class field
+ if (!keep_quoted_strict || !node.key.end.quote) {
+ node.key.name = mangle(node.key.name);
+ }
+ } else if (node instanceof AST_Dot) {
+ if (!keep_quoted_strict || !node.quote) {
+ node.property = mangle(node.property);
+ }
+ } else if (!options.keep_quoted && node instanceof AST_Sub) {
+ node.property = mangleStrings(node.property);
+ } else if (node instanceof AST_Call
+ && node.expression.print_to_string() == "Object.defineProperty") {
+ node.args[1] = mangleStrings(node.args[1]);
+ } else if (node instanceof AST_Binary && node.operator === "in") {
+ node.left = mangleStrings(node.left);
+ }
+ }));
+
+ // only function declarations after this line
+
+ function can_mangle(name) {
+ if (unmangleable.has(name)) return false;
+ if (reserved.has(name)) return false;
+ if (options.only_cache) {
+ return cache.has(name);
+ }
+ if (/^-?[0-9]+(\.[0-9]+)?(e[+-][0-9]+)?$/.test(name)) return false;
+ return true;
+ }
+
+ function should_mangle(name) {
+ if (regex && !regex.test(name)) return false;
+ if (reserved.has(name)) return false;
+ return cache.has(name)
+ || names_to_mangle.has(name);
+ }
+
+ function add(name) {
+ if (can_mangle(name))
+ names_to_mangle.add(name);
+
+ if (!should_mangle(name)) {
+ unmangleable.add(name);
+ }
+ }
+
+ function mangle(name) {
+ if (!should_mangle(name)) {
+ return name;
+ }
+
+ var mangled = cache.get(name);
+ if (!mangled) {
+ if (debug) {
+ // debug mode: use a prefix and suffix to preserve readability, e.g. o.foo -> o._$foo$NNN_.
+ var debug_mangled = "_$" + name + "$" + debug_name_suffix + "_";
+
+ if (can_mangle(debug_mangled)) {
+ mangled = debug_mangled;
+ }
+ }
+
+ // either debug mode is off, or it is on and we could not use the mangled name
+ if (!mangled) {
+ do {
+ mangled = base54(++cname);
+ } while (!can_mangle(mangled));
+ }
+
+ cache.set(name, mangled);
+ }
+ return mangled;
+ }
+
+ function mangleStrings(node) {
+ return node.transform(new TreeTransformer(function(node) {
+ if (node instanceof AST_Sequence) {
+ var last = node.expressions.length - 1;
+ node.expressions[last] = mangleStrings(node.expressions[last]);
+ } else if (node instanceof AST_String) {
+ node.value = mangle(node.value);
+ } else if (node instanceof AST_Conditional) {
+ node.consequent = mangleStrings(node.consequent);
+ node.alternative = mangleStrings(node.alternative);
+ }
+ return node;
+ }));
+ }
+}
+
+export {
+ reserve_quoted_keys,
+ mangle_properties,
+};