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// Ported from js-yaml v3.13.1:// https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da// Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
import { StyleVariant, Type } from "../type.ts";import { Any, isNegativeZero } from "../utils.ts";
const 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: string): boolean {  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: string): number {  let value = data.replace(/_/g, "").toLowerCase();  const sign = value[0] === "-" ? -1 : 1;  const digits: number[] = [];
  if ("+-".indexOf(value[0]) >= 0) {    value = value.slice(1);  }
  if (value === ".inf") {    return sign === 1 ? Number.POSITIVE_INFINITY : Number.NEGATIVE_INFINITY;  }  if (value === ".nan") {    return NaN;  }  if (value.indexOf(":") >= 0) {    value.split(":").forEach((v) => {      digits.unshift(parseFloat(v));    });
    let valueNb = 0.0;    let base = 1;
    digits.forEach((d) => {      valueNb += d * base;      base *= 60;    });
    return sign * valueNb;  }  return sign * parseFloat(value);}
const SCIENTIFIC_WITHOUT_DOT = /^[-+]?[0-9]+e/;
function representYamlFloat(object: Any, style?: StyleVariant): Any {  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 (isNegativeZero(object)) {    return "-0.0";  }
  const res = object.toString(10);
  // JS stringifier can build scientific format without dots: 5e-100,  // while YAML requires dot: 5.e-100. Fix it with simple hack
  return SCIENTIFIC_WITHOUT_DOT.test(res) ? res.replace("e", ".e") : res;}
function isFloat(object: Any): boolean {  return (    Object.prototype.toString.call(object) === "[object Number]" &&    (object % 1 !== 0 || isNegativeZero(object))  );}
export const float = new Type("tag:yaml.org,2002:float", {  construct: constructYamlFloat,  defaultStyle: "lowercase",  kind: "scalar",  predicate: isFloat,  represent: representYamlFloat,  resolve: resolveYamlFloat,});