'use strict';
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var common = require('../common');
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var Type = require('../type');
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var YAML_FLOAT_PATTERN = new RegExp(
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// 2.5e4, 2.5 and integers
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'^(?:[-+]?(?:0|[1-9][0-9_]*)(?:\\.[0-9_]*)?(?:[eE][-+]?[0-9]+)?' +
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// .2e4, .2
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// special case, seems not from spec
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'|\\.[0-9_]+(?:[eE][-+]?[0-9]+)?' +
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// 20:59
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'|[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+\\.[0-9_]*' +
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// .inf
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'|[-+]?\\.(?:inf|Inf|INF)' +
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// .nan
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'|\\.(?:nan|NaN|NAN))$');
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function resolveYamlFloat(data) {
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if (data === null) return false;
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if (!YAML_FLOAT_PATTERN.test(data) ||
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// Quick hack to not allow integers end with `_`
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// Probably should update regexp & check speed
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data[data.length - 1] === '_') {
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return false;
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}
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return true;
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}
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function constructYamlFloat(data) {
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var value, sign, base, digits;
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value = data.replace(/_/g, '').toLowerCase();
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sign = value[0] === '-' ? -1 : 1;
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digits = [];
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if ('+-'.indexOf(value[0]) >= 0) {
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value = value.slice(1);
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}
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if (value === '.inf') {
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return (sign === 1) ? Number.POSITIVE_INFINITY : Number.NEGATIVE_INFINITY;
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} else if (value === '.nan') {
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return NaN;
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} else if (value.indexOf(':') >= 0) {
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value.split(':').forEach(function (v) {
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digits.unshift(parseFloat(v, 10));
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});
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value = 0.0;
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base = 1;
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digits.forEach(function (d) {
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value += d * base;
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base *= 60;
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});
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return sign * value;
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}
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return sign * parseFloat(value, 10);
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}
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var SCIENTIFIC_WITHOUT_DOT = /^[-+]?[0-9]+e/;
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function representYamlFloat(object, style) {
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var res;
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if (isNaN(object)) {
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switch (style) {
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case 'lowercase': return '.nan';
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case 'uppercase': return '.NAN';
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case 'camelcase': return '.NaN';
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}
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} else if (Number.POSITIVE_INFINITY === object) {
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switch (style) {
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case 'lowercase': return '.inf';
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case 'uppercase': return '.INF';
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case 'camelcase': return '.Inf';
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}
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} else if (Number.NEGATIVE_INFINITY === object) {
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switch (style) {
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case 'lowercase': return '-.inf';
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case 'uppercase': return '-.INF';
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case 'camelcase': return '-.Inf';
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}
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} else if (common.isNegativeZero(object)) {
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return '-0.0';
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}
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res = object.toString(10);
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// JS stringifier can build scientific format without dots: 5e-100,
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// while YAML requres dot: 5.e-100. Fix it with simple hack
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return SCIENTIFIC_WITHOUT_DOT.test(res) ? res.replace('e', '.e') : res;
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}
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function isFloat(object) {
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return (Object.prototype.toString.call(object) === '[object Number]') &&
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(object % 1 !== 0 || common.isNegativeZero(object));
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}
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module.exports = new Type('tag:yaml.org,2002:float', {
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kind: 'scalar',
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resolve: resolveYamlFloat,
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construct: constructYamlFloat,
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predicate: isFloat,
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represent: representYamlFloat,
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defaultStyle: 'lowercase'
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});
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