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author | Minteck <contact@minteck.org> | 2021-12-21 16:52:28 +0100 |
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committer | Minteck <contact@minteck.org> | 2021-12-21 16:52:28 +0100 |
commit | 46e43f4bde4a35785b4997b81e86cd19f046b69b (patch) | |
tree | c53c2f826f777f9d6b2d249dab556feb72a6c3a6 /src/node_modules/terser/lib/propmangle.js | |
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Diffstat (limited to 'src/node_modules/terser/lib/propmangle.js')
-rw-r--r-- | src/node_modules/terser/lib/propmangle.js | 322 |
1 files changed, 322 insertions, 0 deletions
diff --git a/src/node_modules/terser/lib/propmangle.js b/src/node_modules/terser/lib/propmangle.js new file mode 100644 index 0000000..6f62fb5 --- /dev/null +++ b/src/node_modules/terser/lib/propmangle.js @@ -0,0 +1,322 @@ +/*********************************************************************** + + 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, +}; |