t-comm/lib/rem/rem.js

专业、稳定、纯粹的工具库

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

/**
 * 转化 rem 单位
 * @param {string} content 输入内容
 * @param {number} factor 转化比例，默认 100
 * @param {string} unit 转化单位，默认 rpx
 * @returns {string} 转化后的结果
 *
 * @example
 * ```ts
 * transFormRem('1.22rem')
 * // 122rpx
 *
 * transFormRem('1.22rem', 50, 'px')
 * // 61px
 *
 * transFormRem('.21rem', 50, 'px')
 * // 10.50px
 * ```
 */
function transFormRem(content, factor, unit) {
  if (factor === void 0) {
    factor = 100;
  }
  if (unit === void 0) {
    unit = 'rpx';
  }
  if (content == null) {
    return content;
  }
  var pattern = new RegExp('([0-9.]*[0-9]+)([\\s]*)(rem)', 'g');
  var match = undefined;
  var records = [];
  // eslint-disable-next-line no-cond-assign
  while (match = pattern.exec(content)) {
    var keyword = match[0];
    var number = parseFloat(match[1]);
    records.push({
      index: match.index,
      length: keyword.length,
      keyword: keyword,
      number: number
    });
  }
  if (records.length > 0) {
    var buffer = "".concat(content);
    for (var _i = 0, records_1 = records; _i < records_1.length; _i++) {
      var record = records_1[_i];
      var number = (record.number * factor).toFixed(2);
      if (+number == parseInt(number, 10)) {
        // 去掉无效的小数点，比如：28.00
        number = "".concat(parseInt(number, 10));
      }
      buffer = buffer.replace(record.keyword, "".concat(number).concat(unit));
    }
    return buffer;
  }
  return content;
}

exports.transFormRem = transFormRem;