parse-translation-value.js

// Parse the value returned by $.css('-webkit-transform')
var parseTranslationValue = function (value, suffix, axis) {
    if (angular.isUndefined(value) || value === '') {
        // return early if value isn't passed.
        return 0;
    } else {

        // Default suffix value.
        if (angular.isUndefined(suffix)) {
            suffix = '';
        }
        // Default axis value.
        if (angular.isUndefined(axis)) {
            axis = 'z';
        }
        // The axis must be uppercase.
        axis = axis.toUpperCase();

        // Find the value of the transform for axis and ending with
        // suffix. A regexp was not chosen for performance in iOS.
        // http://jsperf.com/regexp-vs-indexof-for-transform-values
        var strings = value.split(' ');
        var translationValue;
        var axisPosition;
        var cutStart;
        var cutEnd;
        // Use a for loop as it's quicker than [].forEach
        var i;
        var str;
        for (i = 0; i < strings.length; i++) {
            str = strings[i];
            axisPosition = str.indexOf(axis);
            if (axisPosition !== -1) {
                // Cut between the opening paren and the suffix. axisPosition is
                // the axis character, so we need to move forward by two to
                // cover it and the opening paren. The substring end value
                // doesn't include the character at that position so we don't
                // need to adjust it. cutEnd is either the first character of
                // the suffix or the closing paren.
                cutStart = axisPosition + 2;
                if (suffix.length > 0) {
                    cutEnd = str.indexOf(suffix.charAt(0));
                }
                if (suffix.length === 0 || cutEnd === -1) {
                    cutEnd = str.indexOf(')');
                }
                translationValue = str.substring(cutStart, cutEnd);
                // Break out of the loop because we have the value.
                break;
            }
        };

        // Return an integer.
        return parseInt(translationValue, 10);
    }
};