diff options
Diffstat (limited to 'node_modules/js-yaml/lib/js-yaml/type/float.js')
-rw-r--r-- | node_modules/js-yaml/lib/js-yaml/type/float.js | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/node_modules/js-yaml/lib/js-yaml/type/float.js b/node_modules/js-yaml/lib/js-yaml/type/float.js new file mode 100644 index 0000000..127671b --- /dev/null +++ b/node_modules/js-yaml/lib/js-yaml/type/float.js @@ -0,0 +1,116 @@ +'use strict'; + +var common = require('../common'); +var Type = require('../type'); + +var YAML_FLOAT_PATTERN = new RegExp( + // 2.5e4, 2.5 and integers + '^(?:[-+]?(?:0|[1-9][0-9_]*)(?:\\.[0-9_]*)?(?:[eE][-+]?[0-9]+)?' + + // .2e4, .2 + // special case, seems not from spec + '|\\.[0-9_]+(?:[eE][-+]?[0-9]+)?' + + // 20:59 + '|[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+\\.[0-9_]*' + + // .inf + '|[-+]?\\.(?:inf|Inf|INF)' + + // .nan + '|\\.(?:nan|NaN|NAN))$'); + +function resolveYamlFloat(data) { + if (data === null) return false; + + if (!YAML_FLOAT_PATTERN.test(data) || + // Quick hack to not allow integers end with `_` + // Probably should update regexp & check speed + data[data.length - 1] === '_') { + return false; + } + + return true; +} + +function constructYamlFloat(data) { + var value, sign, base, digits; + + value = data.replace(/_/g, '').toLowerCase(); + sign = value[0] === '-' ? -1 : 1; + digits = []; + + if ('+-'.indexOf(value[0]) >= 0) { + value = value.slice(1); + } + + if (value === '.inf') { + return (sign === 1) ? Number.POSITIVE_INFINITY : Number.NEGATIVE_INFINITY; + + } else if (value === '.nan') { + return NaN; + + } else if (value.indexOf(':') >= 0) { + value.split(':').forEach(function (v) { + digits.unshift(parseFloat(v, 10)); + }); + + value = 0.0; + base = 1; + + digits.forEach(function (d) { + value += d * base; + base *= 60; + }); + + return sign * value; + + } + return sign * parseFloat(value, 10); +} + + +var SCIENTIFIC_WITHOUT_DOT = /^[-+]?[0-9]+e/; + +function representYamlFloat(object, style) { + var res; + + if (isNaN(object)) { + switch (style) { + case 'lowercase': return '.nan'; + case 'uppercase': return '.NAN'; + case 'camelcase': return '.NaN'; + } + } else if (Number.POSITIVE_INFINITY === object) { + switch (style) { + case 'lowercase': return '.inf'; + case 'uppercase': return '.INF'; + case 'camelcase': return '.Inf'; + } + } else if (Number.NEGATIVE_INFINITY === object) { + switch (style) { + case 'lowercase': return '-.inf'; + case 'uppercase': return '-.INF'; + case 'camelcase': return '-.Inf'; + } + } else if (common.isNegativeZero(object)) { + return '-0.0'; + } + + res = object.toString(10); + + // JS stringifier can build scientific format without dots: 5e-100, + // while YAML requres dot: 5.e-100. Fix it with simple hack + + return SCIENTIFIC_WITHOUT_DOT.test(res) ? res.replace('e', '.e') : res; +} + +function isFloat(object) { + return (Object.prototype.toString.call(object) === '[object Number]') && + (object % 1 !== 0 || common.isNegativeZero(object)); +} + +module.exports = new Type('tag:yaml.org,2002:float', { + kind: 'scalar', + resolve: resolveYamlFloat, + construct: constructYamlFloat, + predicate: isFloat, + represent: representYamlFloat, + defaultStyle: 'lowercase' +}); |