ut2/lib/internals/compare.js

一个现代 JavaScript 实用工具库。[点击查看在线文档]。

'use strict';

var isNumber = require('../isNumber.js');
var isSymbol = require('../isSymbol.js');
var toString = require('../toString.js');

function createCompare(dir) {
    var asc = dir === 1;
    function wrapper(value, other) {
        var valueIsSymbol = isSymbol(value);
        var otherIsSymbol = isSymbol(other);
        var isNeedConvertString = !valueIsSymbol && !otherIsSymbol && !(isNumber(value) && isNumber(other));
        var _value = isNeedConvertString ? toString(value) : value;
        var _other = isNeedConvertString ? toString(other) : other;
        if (!otherIsSymbol && (valueIsSymbol || _value > _other)) {
            return asc ? 1 : -1;
        }
        if (!valueIsSymbol && (otherIsSymbol || _value < _other)) {
            return asc ? -1 : 1;
        }
        return 0;
    }
    return wrapper;
}
function compareMultiple(object, other, orders) {
    var objCriteria = object.criteria;
    var othCriteria = other.criteria;
    var length = objCriteria.length;
    var index = -1;
    while (++index < length) {
        var order = orders[index];
        var cmpFn = typeof order === 'function' ? order : order === 'desc' ? createCompare(0) : createCompare(1);
        var result = cmpFn(objCriteria[index], othCriteria[index]);
        if (result) {
            return result;
        }
    }
    return object.index - other.index;
}

exports.compareMultiple = compareMultiple;