path: root/lib/utils.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:

    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";

function array_to_hash(a) {
    var ret = Object.create(null);
    for (var i = 0; i < a.length; ++i)
        ret[a[i]] = true;
    return ret;
};

function slice(a, start) {
    return Array.prototype.slice.call(a, start || 0);
};

function characters(str) {
    return str.split("");
};

function member(name, array) {
    for (var i = array.length; --i >= 0;)
        if (array[i] == name)
            return true;
    return false;
};

function find_if(func, array) {
    for (var i = 0, n = array.length; i < n; ++i) {
        if (func(array[i]))
            return array[i];
    }
};

function repeat_string(str, i) {
    if (i <= 0) return "";
    if (i == 1) return str;
    var d = repeat_string(str, i >> 1);
    d += d;
    if (i & 1) d += str;
    return d;
};

function DefaultsError(msg, defs) {
    this.msg = msg;
    this.defs = defs;
};

function defaults(args, defs, croak) {
    if (args === true)
        args = {};
    var ret = args || {};
    if (croak) for (var i in ret) if (ret.hasOwnProperty(i) && !defs.hasOwnProperty(i))
        throw new DefaultsError("`" + i + "` is not a supported option", defs);
    for (var i in defs) if (defs.hasOwnProperty(i)) {
        ret[i] = (args && args.hasOwnProperty(i)) ? args[i] : defs[i];
    }
    return ret;
};

function merge(obj, ext) {
    for (var i in ext) if (ext.hasOwnProperty(i)) {
        obj[i] = ext[i];
    }
    return obj;
};

function noop() {};

var MAP = (function(){
    function MAP(a, f, backwards) {
        var ret = [], top = [], i;
        function doit() {
            var val = f(a[i], i);
            var is_last = val instanceof Last;
            if (is_last) val = val.v;
            if (val instanceof AtTop) {
                val = val.v;
                if (val instanceof Splice) {
                    top.push.apply(top, backwards ? val.v.slice().reverse() : val.v);
                } else {
                    top.push(val);
                }
            }
            else if (val !== skip) {
                if (val instanceof Splice) {
                    ret.push.apply(ret, backwards ? val.v.slice().reverse() : val.v);
                } else {
                    ret.push(val);
                }
            }
            return is_last;
        };
        if (a instanceof Array) {
            if (backwards) {
                for (i = a.length; --i >= 0;) if (doit()) break;
                ret.reverse();
                top.reverse();
            } else {
                for (i = 0; i < a.length; ++i) if (doit()) break;
            }
        }
        else {
            for (i in a) if (a.hasOwnProperty(i)) if (doit()) break;
        }
        return top.concat(ret);
    };
    MAP.at_top = function(val) { return new AtTop(val) };
    MAP.splice = function(val) { return new Splice(val) };
    MAP.last = function(val) { return new Last(val) };
    var skip = MAP.skip = {};
    function AtTop(val) { this.v = val };
    function Splice(val) { this.v = val };
    function Last(val) { this.v = val };
    return MAP;
})();

function push_uniq(array, el) {
    if (array.indexOf(el) < 0)
        array.push(el);
};

function string_template(text, props) {
    return text.replace(/\{(.+?)\}/g, function(str, p){
        return props[p];
    });
};

function mergeSort(array, cmp) {
    if (array.length < 2) return array.slice();
    function merge(a, b) {
        var r = [], ai = 0, bi = 0, i = 0;
        while (ai < a.length && bi < b.length) {
            cmp(a[ai], b[bi]) <= 0
                ? r[i++] = a[ai++]
                : r[i++] = b[bi++];
        }
        if (ai < a.length) r.push.apply(r, a.slice(ai));
        if (bi < b.length) r.push.apply(r, b.slice(bi));
        return r;
    };
    function _ms(a) {
        if (a.length <= 1)
            return a;
        var m = Math.floor(a.length / 2), left = a.slice(0, m), right = a.slice(m);
        left = _ms(left);
        right = _ms(right);
        return merge(left, right);
    };
    return _ms(array);
};

function set_difference(a, b) {
    return a.filter(function(el){
        return b.indexOf(el) < 0;
    });
};

function set_intersection(a, b) {
    return a.filter(function(el){
        return b.indexOf(el) >= 0;
    });
};

// this function is taken from Acorn [1], written by Marijn Haverbeke
// [1] https://github.com/marijnh/acorn
function makePredicate(words) {
    if (!(words instanceof Array)) words = words.split(" ");
    var f = "", cats = [];
    out: for (var i = 0; i < words.length; ++i) {
        for (var j = 0; j < cats.length; ++j)
            if (cats[j][0].length == words[i].length) {
                cats[j].push(words[i]);
                continue out;
            }
        cats.push([words[i]]);
    }
    function compareTo(arr) {
        if (arr.length == 1) return f += "return str === " + JSON.stringify(arr[0]) + ";";
        f += "switch(str){";
        for (var i = 0; i < arr.length; ++i) f += "case " + JSON.stringify(arr[i]) + ":";
        f += "return true}return false;";
    }
    // When there are more than three length categories, an outer
    // switch first dispatches on the lengths, to save on comparisons.
    if (cats.length > 3) {
        cats.sort(function(a, b) {return b.length - a.length;});
        f += "switch(str.length){";
        for (var i = 0; i < cats.length; ++i) {
            var cat = cats[i];
            f += "case " + cat[0].length + ":";
            compareTo(cat);
        }
        f += "}";
        // Otherwise, simply generate a flat `switch` statement.
    } else {
        compareTo(words);
    }
    return new Function("str", f);
};