61 lines
2.0 KiB
JavaScript
61 lines
2.0 KiB
JavaScript
"use strict";
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exports.__esModule = true;
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exports["default"] = remToPx;
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var _getValueAndUnit = _interopRequireDefault(require("./getValueAndUnit"));
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var _errors = _interopRequireDefault(require("../internalHelpers/_errors"));
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
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var defaultFontSize = 16;
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function convertBase(base) {
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var deconstructedValue = (0, _getValueAndUnit["default"])(base);
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if (deconstructedValue[1] === 'px') {
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return parseFloat(base);
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}
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if (deconstructedValue[1] === '%') {
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return parseFloat(base) / 100 * defaultFontSize;
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}
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throw new _errors["default"](78, deconstructedValue[1]);
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}
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function getBaseFromDoc() {
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/* eslint-disable */
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/* istanbul ignore next */
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if (typeof document !== 'undefined' && document.documentElement !== null) {
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var rootFontSize = getComputedStyle(document.documentElement).fontSize;
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return rootFontSize ? convertBase(rootFontSize) : defaultFontSize;
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}
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/* eslint-enable */
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/* istanbul ignore next */
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return defaultFontSize;
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}
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/**
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* Convert rem values to px. By default, the base value is pulled from the font-size property on the root element (if it is set in % or px). It defaults to 16px if not found on the root. You can also override the base value by providing your own base in % or px.
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* @example
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* // Styles as object usage
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* const styles = {
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* 'height': remToPx('1.6rem')
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* 'height': remToPx('1.6rem', '10px')
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* }
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*
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* // styled-components usage
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* const div = styled.div`
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* height: ${remToPx('1.6rem')}
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* height: ${remToPx('1.6rem', '10px')}
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* `
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*
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* // CSS in JS Output
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*
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* element {
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* 'height': '25.6px',
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* 'height': '16px',
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* }
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*/
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function remToPx(value, base) {
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var deconstructedValue = (0, _getValueAndUnit["default"])(value);
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if (deconstructedValue[1] !== 'rem' && deconstructedValue[1] !== '') {
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throw new _errors["default"](77, deconstructedValue[1]);
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}
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var newBase = base ? convertBase(base) : getBaseFromDoc();
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return deconstructedValue[0] * newBase + "px";
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}
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module.exports = exports.default; |