parseunit
Version:
Parse strings with a number and unit
37 lines (26 loc) • 1.65 kB
JavaScript
// from https://stackoverflow.com/questions/638565/parsing-scientific-notation-sensibly
;
Object.defineProperty(exports, '__esModule', {
value: true
});
var _slicedToArray = (function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i['return']) _i['return'](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError('Invalid attempt to destructure non-iterable instance'); } }; })();
exports['default'] = parseUnit;
exports.parseUnitObj = parseUnitObj;
var NUMBER_REGEX = /-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/;
function parseUnit(str) {
// parse the number at the start of the string (this could return it in exponential notation)
var val = parseFloat(str);
// this is the actual number string,
// might not be the same length as val if val is in exponential notation
var numberStrings = str.match(NUMBER_REGEX) || [];
// get everything after this number
var unit = numberStrings.length > 0 ? str.substr(numberStrings[0].length).trim() : '';
return [val, unit];
}
function parseUnitObj(str) {
var _parseUnit = parseUnit(str);
var _parseUnit2 = _slicedToArray(_parseUnit, 2);
var val = _parseUnit2[0];
var unit = _parseUnit2[1];
return { val: val, unit: unit };
}