Length.js

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});
exports.calculateLengthFromValueWithUnit = exports.LENGTH_TYPE = undefined;

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

var _NodeContainer = require('./NodeContainer');

var _NodeContainer2 = _interopRequireDefault(_NodeContainer);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var LENGTH_WITH_UNIT = /([\d.]+)(px|r?em|%)/i;

var LENGTH_TYPE = exports.LENGTH_TYPE = {
    PX: 0,
    PERCENTAGE: 1
};

var Length = function () {
    function Length(value) {
        _classCallCheck(this, Length);

        this.type = value.substr(value.length - 1) === '%' ? LENGTH_TYPE.PERCENTAGE : LENGTH_TYPE.PX;
        var parsedValue = parseFloat(value);
        if (process.env.NODE_ENV !== 'production' && isNaN(parsedValue)) {
            console.error('Invalid value given for Length: "' + value + '"');
        }
        this.value = isNaN(parsedValue) ? 0 : parsedValue;
    }

    _createClass(Length, [{
        key: 'isPercentage',
        value: function isPercentage() {
            return this.type === LENGTH_TYPE.PERCENTAGE;
        }
    }, {
        key: 'getAbsoluteValue',
        value: function getAbsoluteValue(parentLength) {
            return this.isPercentage() ? parentLength * (this.value / 100) : this.value;
        }
    }], [{
        key: 'create',
        value: function create(v) {
            return new Length(v);
        }
    }]);

    return Length;
}();

exports.default = Length;


var getRootFontSize = function getRootFontSize(container) {
    var parent = container.parent;
    return parent ? getRootFontSize(parent) : parseFloat(container.style.font.fontSize);
};

var calculateLengthFromValueWithUnit = exports.calculateLengthFromValueWithUnit = function calculateLengthFromValueWithUnit(container, value, unit) {
    switch (unit) {
        case 'px':
        case '%':
            return new Length(value + unit);
        case 'em':
        case 'rem':
            var length = new Length(value);
            length.value *= unit === 'em' ? parseFloat(container.style.font.fontSize) : getRootFontSize(container);
            return length;
        default:
            // TODO: handle correctly if unknown unit is used
            return new Length('0');
    }
};