109 lines
2.2 KiB
JavaScript
109 lines
2.2 KiB
JavaScript
'use strict';
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var Type = require('../type');
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var YAML_FLOAT_PATTERN = new RegExp(
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'^(?:[-+]?(?:[0-9][0-9_]*)\\.[0-9_]*(?:[eE][-+][0-9]+)?' +
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'|\\.[0-9_]+(?:[eE][-+][0-9]+)?' +
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'|[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+\\.[0-9_]*' +
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'|[-+]?\\.(?:inf|Inf|INF)' +
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'|\\.(?:nan|NaN|NAN))$');
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function resolveYamlFloat(state) {
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var value, sign, base, digits,
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object = state.result;
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if (!YAML_FLOAT_PATTERN.test(object)) {
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return false;
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}
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value = object.replace(/_/g, '').toLowerCase();
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sign = '-' === value[0] ? -1 : 1;
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digits = [];
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if (0 <= '+-'.indexOf(value[0])) {
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value = value.slice(1);
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}
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if ('.inf' === value) {
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state.result = (1 === sign) ? Number.POSITIVE_INFINITY : Number.NEGATIVE_INFINITY;
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return true;
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} else if ('.nan' === value) {
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state.result = NaN;
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return true;
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} else if (0 <= value.indexOf(':')) {
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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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state.result = sign * value;
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return true;
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} else {
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state.result = sign * parseFloat(value, 10);
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return true;
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}
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}
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function representYamlFloat(object, style) {
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if (isNaN(object)) {
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switch (style) {
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case 'lowercase':
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return '.nan';
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case 'uppercase':
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return '.NAN';
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case 'camelcase':
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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':
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return '.inf';
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case 'uppercase':
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return '.INF';
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case 'camelcase':
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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':
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return '-.inf';
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case 'uppercase':
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return '-.INF';
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case 'camelcase':
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return '-.Inf';
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}
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} else {
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return object.toString(10);
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}
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}
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function isFloat(object) {
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return ('[object Number]' === Object.prototype.toString.call(object)) &&
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(0 !== object % 1);
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}
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module.exports = new Type('tag:yaml.org,2002:float', {
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loadKind: 'scalar',
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loadResolver: resolveYamlFloat,
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dumpPredicate: isFloat,
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dumpRepresenter: representYamlFloat,
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dumpDefaultStyle: 'lowercase'
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});
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