float.js•1.63 kB
'use strict';
var Scalar = require('../../nodes/Scalar.js');
var stringifyNumber = require('../../stringify/stringifyNumber.js');
const floatNaN = {
identify: value => typeof value === 'number',
default: true,
tag: 'tag:yaml.org,2002:float',
test: /^(?:[-+]?\.(?:inf|Inf|INF)|\.nan|\.NaN|\.NAN)$/,
resolve: (str) => str.slice(-3).toLowerCase() === 'nan'
? NaN
: str[0] === '-'
? Number.NEGATIVE_INFINITY
: Number.POSITIVE_INFINITY,
stringify: stringifyNumber.stringifyNumber
};
const floatExp = {
identify: value => typeof value === 'number',
default: true,
tag: 'tag:yaml.org,2002:float',
format: 'EXP',
test: /^[-+]?(?:[0-9][0-9_]*)?(?:\.[0-9_]*)?[eE][-+]?[0-9]+$/,
resolve: (str) => parseFloat(str.replace(/_/g, '')),
stringify(node) {
const num = Number(node.value);
return isFinite(num) ? num.toExponential() : stringifyNumber.stringifyNumber(node);
}
};
const float = {
identify: value => typeof value === 'number',
default: true,
tag: 'tag:yaml.org,2002:float',
test: /^[-+]?(?:[0-9][0-9_]*)?\.[0-9_]*$/,
resolve(str) {
const node = new Scalar.Scalar(parseFloat(str.replace(/_/g, '')));
const dot = str.indexOf('.');
if (dot !== -1) {
const f = str.substring(dot + 1).replace(/_/g, '');
if (f[f.length - 1] === '0')
node.minFractionDigits = f.length;
}
return node;
},
stringify: stringifyNumber.stringifyNumber
};
exports.float = float;
exports.floatExp = floatExp;
exports.floatNaN = floatNaN;