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Edit File: propmangle.js

/***********************************************************************

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:

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";

function mangle_properties(ast, options) {
    options = defaults(options, {
        cache: null,
        debug: false,
        ignore_quoted: false,
        only_cache: false,
        regex: null,
        reserved: null,
    });

var reserved = options.reserved;
    if (reserved == null)
        reserved = find_builtins();

var cache = options.cache;
    if (cache == null) {
        cache = {
            cname: -1,
            props: new Dictionary()
        };
    }

var regex = options.regex;
    var ignore_quoted = options.ignore_quoted;

// 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 = [];
    var unmangleable = [];
    var ignored = {};

// step 1: find candidates to mangle
    ast.walk(new TreeWalker(function(node){
        if (node instanceof AST_ObjectKeyVal) {
            add(node.key, ignore_quoted && node.quote);
        }
        else if (node instanceof AST_ObjectProperty) {
            // setter or getter, since KeyVal is handled above
            add(node.key.name);
        }
        else if (node instanceof AST_Dot) {
            add(node.property);
        }
        else if (node instanceof AST_Sub) {
            addStrings(node.property, ignore_quoted);
        }
    }));

// step 2: transform the tree, renaming properties
    return ast.transform(new TreeTransformer(function(node){
        if (node instanceof AST_ObjectKeyVal) {
            if (!(ignore_quoted && node.quote))
                node.key = mangle(node.key);
        }
        else if (node instanceof AST_ObjectProperty) {
            // setter or getter
            node.key.name = mangle(node.key.name);
        }
        else if (node instanceof AST_Dot) {
            node.property = mangle(node.property);
        }
        else if (node instanceof AST_Sub) {
            if (!ignore_quoted)
                node.property = mangleStrings(node.property);
        }
        // else if (node instanceof AST_String) {
        //     if (should_mangle(node.value)) {
        //         AST_Node.warn(
        //             "Found \"{prop}\" property candidate for mangling in an arbitrary string [{file}:{line},{col}]", {
        //                 file : node.start.file,
        //                 line : node.start.line,
        //                 col  : node.start.col,
        //                 prop : node.value
        //             }
        //         );
        //     }
        // }
    }));

// only function declarations after this line

function can_mangle(name) {
        if (unmangleable.indexOf(name) >= 0) return false;
        if (reserved.indexOf(name) >= 0) return false;
        if (options.only_cache) {
            return cache.props.has(name);
        }
        if (/^-?[0-9]+(\.[0-9]+)?(e[+-][0-9]+)?$/.test(name)) return false;
        return true;
    }

function should_mangle(name) {
        if (ignore_quoted && name in ignored) return false;
        if (regex && !regex.test(name)) return false;
        if (reserved.indexOf(name) >= 0) return false;
        return cache.props.has(name)
            || names_to_mangle.indexOf(name) >= 0;
    }

function add(name, ignore) {
        if (ignore) {
            ignored[name] = true;
            return;
        }

if (can_mangle(name))
            push_uniq(names_to_mangle, name);

if (!should_mangle(name)) {
            push_uniq(unmangleable, name);
        }
    }

function mangle(name) {
        if (!should_mangle(name)) {
            return name;
        }

var mangled = cache.props.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) && !(ignore_quoted && debug_mangled in ignored)) {
                    mangled = debug_mangled;
                }
            }

// either debug mode is off, or it is on and we could not use the mangled name
            if (!mangled) {
                // note can_mangle() does not check if the name collides with the 'ignored' set
                // (filled with quoted properties when ignore_quoted set). Make sure we add this
                // check so we don't collide with a quoted name.
                do {
                    mangled = base54(++cache.cname);
                } while (!can_mangle(mangled) || (ignore_quoted && mangled in ignored));
            }

cache.props.set(name, mangled);
        }
        return mangled;
    }

}