devextreme/data/utils.js

HTML5 JavaScript Component Suite for Responsive Web Development

/**
 * DevExtreme (data/utils.js)
 * Version: 18.1.3
 * Build date: Tue May 15 2018
 *
 * Copyright (c) 2012 - 2018 Developer Express Inc. ALL RIGHTS RESERVED
 * Read about DevExtreme licensing here: https://js.devexpress.com/Licensing/
 */

"use strict";
var isFunction = require("../core/utils/type").isFunction,
    domAdapter = require("../core/dom_adapter"),
    ready = require("../core/utils/ready_callbacks").add,
    windowUtils = require("../core/utils/window"),
    window = windowUtils.getWindow(),
    map = require("../core/utils/iterator").map,
    toComparable = require("../core/utils/data").toComparable,
    Deferred = require("../core/utils/deferred").Deferred;
var XHR_ERROR_UNLOAD = "DEVEXTREME_XHR_ERROR_UNLOAD";
var normalizeBinaryCriterion = function(crit) {
    return [crit[0], crit.length < 3 ? "=" : String(crit[1]).toLowerCase(), crit.length < 2 ? true : crit[crit.length - 1]]
};
var normalizeSortingInfo = function(info) {
    if (!Array.isArray(info)) {
        info = [info]
    }
    return map(info, function(i) {
        var result = {
            selector: isFunction(i) || "string" === typeof i ? i : i.getter || i.field || i.selector,
            desc: !!(i.desc || "d" === String(i.dir).charAt(0).toLowerCase())
        };
        if (i.compare) {
            result.compare = i.compare
        }
        return result
    })
};
var errorMessageFromXhr = function() {
    var textStatusMessages = {
        timeout: "Network connection timeout",
        error: "Unspecified network error",
        parsererror: "Unexpected server response"
    };
    var explainTextStatus = function(textStatus) {
        var result = textStatusMessages[textStatus];
        if (!result) {
            return textStatus
        }
        return result
    };
    var unloading;
    ready(function() {
        domAdapter.listen(window, "beforeunload", function() {
            unloading = true
        })
    });
    return function(xhr, textStatus) {
        if (unloading) {
            return XHR_ERROR_UNLOAD
        }
        if (xhr.status < 400) {
            return explainTextStatus(textStatus)
        }
        return xhr.statusText
    }
}();
var aggregators = {
    count: {
        seed: 0,
        step: function(count) {
            return 1 + count
        }
    },
    sum: {
        seed: 0,
        step: function(sum, item) {
            return sum + item
        }
    },
    min: {
        step: function(min, item) {
            return item < min ? item : min
        }
    },
    max: {
        step: function(max, item) {
            return item > max ? item : max
        }
    },
    avg: {
        seed: [0, 0],
        step: function(pair, value) {
            return [pair[0] + value, pair[1] + 1]
        },
        finalize: function(pair) {
            return pair[1] ? pair[0] / pair[1] : NaN
        }
    }
};
var processRequestResultLock = function() {
    var lockDeferred, lockCount = 0;
    var obtain = function() {
        if (0 === lockCount) {
            lockDeferred = new Deferred
        }
        lockCount++
    };
    var release = function() {
        lockCount--;
        if (lockCount < 1) {
            lockDeferred.resolve()
        }
    };
    var promise = function() {
        var deferred = 0 === lockCount ? (new Deferred).resolve() : lockDeferred;
        return deferred.promise()
    };
    var reset = function() {
        lockCount = 0;
        if (lockDeferred) {
            lockDeferred.resolve()
        }
    };
    return {
        obtain: obtain,
        release: release,
        promise: promise,
        reset: reset
    }
}();

function isDisjunctiveOperator(condition) {
    return /^(or|\|\||\|)$/i.test(condition)
}

function isConjunctiveOperator(condition) {
    return /^(and|\&\&|\&)$/i.test(condition)
}
var keysEqual = function(keyExpr, key1, key2) {
    if (Array.isArray(keyExpr)) {
        var name, names = map(key1, function(v, k) {
            return k
        });
        for (var i = 0; i < names.length; i++) {
            name = names[i];
            if (toComparable(key1[name], true) != toComparable(key2[name], true)) {
                return false
            }
        }
        return true
    }
    return toComparable(key1, true) == toComparable(key2, true)
};
var BASE64_CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
var base64_encode = function(input) {
    if (!Array.isArray(input)) {
        input = stringToByteArray(String(input))
    }
    var result = "";

    function getBase64Char(index) {
        return BASE64_CHARS.charAt(index)
    }
    for (var i = 0; i < input.length; i += 3) {
        var octet1 = input[i],
            octet2 = input[i + 1],
            octet3 = input[i + 2];
        result += map([octet1 >> 2, (3 & octet1) << 4 | octet2 >> 4, isNaN(octet2) ? 64 : (15 & octet2) << 2 | octet3 >> 6, isNaN(octet3) ? 64 : 63 & octet3], getBase64Char).join("")
    }
    return result
};
var stringToByteArray = function(str) {
    var code, i, bytes = [];
    for (i = 0; i < str.length; i++) {
        code = str.charCodeAt(i);
        if (code < 128) {
            bytes.push(code)
        } else {
            if (code < 2048) {
                bytes.push(192 + (code >> 6), 128 + (63 & code))
            } else {
                if (code < 65536) {
                    bytes.push(224 + (code >> 12), 128 + (code >> 6 & 63), 128 + (63 & code))
                } else {
                    if (code < 2097152) {
                        bytes.push(240 + (code >> 18), 128 + (code >> 12 & 63), 128 + (code >> 6 & 63), 128 + (63 & code))
                    }
                }
            }
        }
    }
    return bytes
};
var isUnaryOperation = function(crit) {
    return "!" === crit[0] && Array.isArray(crit[1])
};
var utils = {
    XHR_ERROR_UNLOAD: XHR_ERROR_UNLOAD,
    normalizeBinaryCriterion: normalizeBinaryCriterion,
    normalizeSortingInfo: normalizeSortingInfo,
    errorMessageFromXhr: errorMessageFromXhr,
    aggregators: aggregators,
    keysEqual: keysEqual,
    isDisjunctiveOperator: isDisjunctiveOperator,
    isConjunctiveOperator: isConjunctiveOperator,
    processRequestResultLock: processRequestResultLock,
    isUnaryOperation: isUnaryOperation,
    base64_encode: base64_encode
};
module.exports = utils;