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'use strict';
var common = require('../common');
var Type = require('../type');
var YAML_FLOAT_PATTERN = new RegExp(
'^(?:[-+]?(?:[0-9][0-9_]*)\\.[0-9_]*(?:[eE][-+][0-9]+)?' +
'|\\.[0-9_]+(?:[eE][-+][0-9]+)?' +
'|[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+\\.[0-9_]*' +
'|[-+]?\\.(?:inf|Inf|INF)' +
'|\\.(?:nan|NaN|NAN))$');
function resolveYamlFloat(data) {
if (null === data) {
return false;
}
var value, sign, base, digits;
if (!YAML_FLOAT_PATTERN.test(data)) {
return false;
}
return true;
}
function constructYamlFloat(data) {
var value, sign, base, digits;
value = data.replace(/_/g, '').toLowerCase();
sign = '-' === value[0] ? -1 : 1;
digits = [];
if (0 <= '+-'.indexOf(value[0])) {
value = value.slice(1);
}
if ('.inf' === value) {
return (1 === sign) ? Number.POSITIVE_INFINITY : Number.NEGATIVE_INFINITY;
} else if ('.nan' === value) {
return NaN;
} else if (0 <= value.indexOf(':')) {
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);
}
function representYamlFloat(object, style) {
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';
}
return object.toString(10);
}
function isFloat(object) {
return ('[object Number]' === Object.prototype.toString.call(object)) &&
(0 !== object % 1 || common.isNegativeZero(object));
}
module.exports = new Type('tag:yaml.org,2002:float', {
kind: 'scalar',
resolve: resolveYamlFloat,
construct: constructYamlFloat,
predicate: isFloat,
represent: representYamlFloat,
defaultStyle: 'lowercase'
});
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