1 | /**
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2 | * @license
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3 | * Copyright Google LLC All Rights Reserved.
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4 | *
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5 | * Use of this source code is governed by an MIT-style license that can be
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6 | * found in the LICENSE file at https://angular.io/license
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7 | */
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8 | import { getLocaleNumberFormat, getLocaleNumberSymbol, getNumberOfCurrencyDigits, NumberFormatStyle, NumberSymbol } from './locale_data_api';
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9 | export const NUMBER_FORMAT_REGEXP = /^(\d+)?\.((\d+)(-(\d+))?)?$/;
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10 | const MAX_DIGITS = 22;
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11 | const DECIMAL_SEP = '.';
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12 | const ZERO_CHAR = '0';
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13 | const PATTERN_SEP = ';';
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14 | const GROUP_SEP = ',';
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15 | const DIGIT_CHAR = '#';
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16 | const CURRENCY_CHAR = '¤';
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17 | const PERCENT_CHAR = '%';
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18 | /**
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19 | * Transforms a number to a locale string based on a style and a format.
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20 | */
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21 | function formatNumberToLocaleString(value, pattern, locale, groupSymbol, decimalSymbol, digitsInfo, isPercent = false) {
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22 | let formattedText = '';
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23 | let isZero = false;
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24 | if (!isFinite(value)) {
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25 | formattedText = getLocaleNumberSymbol(locale, NumberSymbol.Infinity);
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26 | }
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27 | else {
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28 | let parsedNumber = parseNumber(value);
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29 | if (isPercent) {
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30 | parsedNumber = toPercent(parsedNumber);
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31 | }
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32 | let minInt = pattern.minInt;
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33 | let minFraction = pattern.minFrac;
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34 | let maxFraction = pattern.maxFrac;
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35 | if (digitsInfo) {
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36 | const parts = digitsInfo.match(NUMBER_FORMAT_REGEXP);
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37 | if (parts === null) {
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38 | throw new Error(`${digitsInfo} is not a valid digit info`);
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39 | }
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40 | const minIntPart = parts[1];
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41 | const minFractionPart = parts[3];
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42 | const maxFractionPart = parts[5];
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43 | if (minIntPart != null) {
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44 | minInt = parseIntAutoRadix(minIntPart);
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45 | }
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46 | if (minFractionPart != null) {
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47 | minFraction = parseIntAutoRadix(minFractionPart);
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48 | }
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49 | if (maxFractionPart != null) {
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50 | maxFraction = parseIntAutoRadix(maxFractionPart);
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51 | }
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52 | else if (minFractionPart != null && minFraction > maxFraction) {
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53 | maxFraction = minFraction;
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54 | }
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55 | }
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56 | roundNumber(parsedNumber, minFraction, maxFraction);
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57 | let digits = parsedNumber.digits;
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58 | let integerLen = parsedNumber.integerLen;
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59 | const exponent = parsedNumber.exponent;
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60 | let decimals = [];
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61 | isZero = digits.every(d => !d);
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62 | // pad zeros for small numbers
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63 | for (; integerLen < minInt; integerLen++) {
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64 | digits.unshift(0);
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65 | }
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66 | // pad zeros for small numbers
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67 | for (; integerLen < 0; integerLen++) {
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68 | digits.unshift(0);
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69 | }
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70 | // extract decimals digits
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71 | if (integerLen > 0) {
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72 | decimals = digits.splice(integerLen, digits.length);
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73 | }
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74 | else {
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75 | decimals = digits;
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76 | digits = [0];
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77 | }
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78 | // format the integer digits with grouping separators
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79 | const groups = [];
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80 | if (digits.length >= pattern.lgSize) {
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81 | groups.unshift(digits.splice(-pattern.lgSize, digits.length).join(''));
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82 | }
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83 | while (digits.length > pattern.gSize) {
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84 | groups.unshift(digits.splice(-pattern.gSize, digits.length).join(''));
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85 | }
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86 | if (digits.length) {
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87 | groups.unshift(digits.join(''));
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88 | }
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89 | formattedText = groups.join(getLocaleNumberSymbol(locale, groupSymbol));
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90 | // append the decimal digits
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91 | if (decimals.length) {
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92 | formattedText += getLocaleNumberSymbol(locale, decimalSymbol) + decimals.join('');
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93 | }
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94 | if (exponent) {
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95 | formattedText += getLocaleNumberSymbol(locale, NumberSymbol.Exponential) + '+' + exponent;
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96 | }
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97 | }
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98 | if (value < 0 && !isZero) {
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99 | formattedText = pattern.negPre + formattedText + pattern.negSuf;
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100 | }
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101 | else {
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102 | formattedText = pattern.posPre + formattedText + pattern.posSuf;
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103 | }
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104 | return formattedText;
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105 | }
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106 | /**
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107 | * @ngModule CommonModule
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108 | * @description
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109 | *
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110 | * Formats a number as currency using locale rules.
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111 | *
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112 | * @param value The number to format.
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113 | * @param locale A locale code for the locale format rules to use.
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114 | * @param currency A string containing the currency symbol or its name,
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115 | * such as "$" or "Canadian Dollar". Used in output string, but does not affect the operation
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116 | * of the function.
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117 | * @param currencyCode The [ISO 4217](https://en.wikipedia.org/wiki/ISO_4217)
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118 | * currency code, such as `USD` for the US dollar and `EUR` for the euro.
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119 | * Used to determine the number of digits in the decimal part.
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120 | * @param digitsInfo Decimal representation options, specified by a string in the following format:
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121 | * `{minIntegerDigits}.{minFractionDigits}-{maxFractionDigits}`. See `DecimalPipe` for more details.
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122 | *
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123 | * @returns The formatted currency value.
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124 | *
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125 | * @see `formatNumber()`
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126 | * @see `DecimalPipe`
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127 | * @see [Internationalization (i18n) Guide](https://angular.io/guide/i18n-overview)
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128 | *
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129 | * @publicApi
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130 | */
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131 | export function formatCurrency(value, locale, currency, currencyCode, digitsInfo) {
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132 | const format = getLocaleNumberFormat(locale, NumberFormatStyle.Currency);
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133 | const pattern = parseNumberFormat(format, getLocaleNumberSymbol(locale, NumberSymbol.MinusSign));
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134 | pattern.minFrac = getNumberOfCurrencyDigits(currencyCode);
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135 | pattern.maxFrac = pattern.minFrac;
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136 | const res = formatNumberToLocaleString(value, pattern, locale, NumberSymbol.CurrencyGroup, NumberSymbol.CurrencyDecimal, digitsInfo);
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137 | return res
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138 | .replace(CURRENCY_CHAR, currency)
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139 | // if we have 2 time the currency character, the second one is ignored
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140 | .replace(CURRENCY_CHAR, '')
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141 | // If there is a spacing between currency character and the value and
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142 | // the currency character is supressed by passing an empty string, the
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143 | // spacing character would remain as part of the string. Then we
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144 | // should remove it.
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145 | .trim();
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146 | }
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147 | /**
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148 | * @ngModule CommonModule
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149 | * @description
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150 | *
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151 | * Formats a number as a percentage according to locale rules.
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152 | *
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153 | * @param value The number to format.
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154 | * @param locale A locale code for the locale format rules to use.
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155 | * @param digitsInfo Decimal representation options, specified by a string in the following format:
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156 | * `{minIntegerDigits}.{minFractionDigits}-{maxFractionDigits}`. See `DecimalPipe` for more details.
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157 | *
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158 | * @returns The formatted percentage value.
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159 | *
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160 | * @see `formatNumber()`
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161 | * @see `DecimalPipe`
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162 | * @see [Internationalization (i18n) Guide](https://angular.io/guide/i18n-overview)
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163 | * @publicApi
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164 | *
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165 | */
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166 | export function formatPercent(value, locale, digitsInfo) {
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167 | const format = getLocaleNumberFormat(locale, NumberFormatStyle.Percent);
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168 | const pattern = parseNumberFormat(format, getLocaleNumberSymbol(locale, NumberSymbol.MinusSign));
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169 | const res = formatNumberToLocaleString(value, pattern, locale, NumberSymbol.Group, NumberSymbol.Decimal, digitsInfo, true);
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170 | return res.replace(new RegExp(PERCENT_CHAR, 'g'), getLocaleNumberSymbol(locale, NumberSymbol.PercentSign));
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171 | }
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172 | /**
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173 | * @ngModule CommonModule
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174 | * @description
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175 | *
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176 | * Formats a number as text, with group sizing, separator, and other
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177 | * parameters based on the locale.
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178 | *
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179 | * @param value The number to format.
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180 | * @param locale A locale code for the locale format rules to use.
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181 | * @param digitsInfo Decimal representation options, specified by a string in the following format:
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182 | * `{minIntegerDigits}.{minFractionDigits}-{maxFractionDigits}`. See `DecimalPipe` for more details.
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183 | *
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184 | * @returns The formatted text string.
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185 | * @see [Internationalization (i18n) Guide](https://angular.io/guide/i18n-overview)
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186 | *
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187 | * @publicApi
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188 | */
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189 | export function formatNumber(value, locale, digitsInfo) {
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190 | const format = getLocaleNumberFormat(locale, NumberFormatStyle.Decimal);
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191 | const pattern = parseNumberFormat(format, getLocaleNumberSymbol(locale, NumberSymbol.MinusSign));
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192 | return formatNumberToLocaleString(value, pattern, locale, NumberSymbol.Group, NumberSymbol.Decimal, digitsInfo);
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193 | }
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194 | function parseNumberFormat(format, minusSign = '-') {
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195 | const p = {
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196 | minInt: 1,
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197 | minFrac: 0,
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198 | maxFrac: 0,
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199 | posPre: '',
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200 | posSuf: '',
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201 | negPre: '',
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202 | negSuf: '',
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203 | gSize: 0,
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204 | lgSize: 0
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205 | };
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206 | const patternParts = format.split(PATTERN_SEP);
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207 | const positive = patternParts[0];
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208 | const negative = patternParts[1];
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209 | const positiveParts = positive.indexOf(DECIMAL_SEP) !== -1 ?
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210 | positive.split(DECIMAL_SEP) :
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211 | [
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212 | positive.substring(0, positive.lastIndexOf(ZERO_CHAR) + 1),
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213 | positive.substring(positive.lastIndexOf(ZERO_CHAR) + 1)
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214 | ], integer = positiveParts[0], fraction = positiveParts[1] || '';
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215 | p.posPre = integer.substr(0, integer.indexOf(DIGIT_CHAR));
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216 | for (let i = 0; i < fraction.length; i++) {
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217 | const ch = fraction.charAt(i);
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218 | if (ch === ZERO_CHAR) {
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219 | p.minFrac = p.maxFrac = i + 1;
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220 | }
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221 | else if (ch === DIGIT_CHAR) {
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222 | p.maxFrac = i + 1;
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223 | }
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224 | else {
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225 | p.posSuf += ch;
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226 | }
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227 | }
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228 | const groups = integer.split(GROUP_SEP);
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229 | p.gSize = groups[1] ? groups[1].length : 0;
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230 | p.lgSize = (groups[2] || groups[1]) ? (groups[2] || groups[1]).length : 0;
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231 | if (negative) {
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232 | const trunkLen = positive.length - p.posPre.length - p.posSuf.length, pos = negative.indexOf(DIGIT_CHAR);
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233 | p.negPre = negative.substr(0, pos).replace(/'/g, '');
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234 | p.negSuf = negative.substr(pos + trunkLen).replace(/'/g, '');
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235 | }
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236 | else {
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237 | p.negPre = minusSign + p.posPre;
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238 | p.negSuf = p.posSuf;
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239 | }
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240 | return p;
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241 | }
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242 | // Transforms a parsed number into a percentage by multiplying it by 100
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243 | function toPercent(parsedNumber) {
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244 | // if the number is 0, don't do anything
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245 | if (parsedNumber.digits[0] === 0) {
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246 | return parsedNumber;
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247 | }
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248 | // Getting the current number of decimals
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249 | const fractionLen = parsedNumber.digits.length - parsedNumber.integerLen;
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250 | if (parsedNumber.exponent) {
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251 | parsedNumber.exponent += 2;
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252 | }
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253 | else {
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254 | if (fractionLen === 0) {
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255 | parsedNumber.digits.push(0, 0);
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256 | }
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257 | else if (fractionLen === 1) {
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258 | parsedNumber.digits.push(0);
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259 | }
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260 | parsedNumber.integerLen += 2;
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261 | }
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262 | return parsedNumber;
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263 | }
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264 | /**
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265 | * Parses a number.
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266 | * Significant bits of this parse algorithm came from https://github.com/MikeMcl/big.js/
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267 | */
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268 | function parseNumber(num) {
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269 | let numStr = Math.abs(num) + '';
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270 | let exponent = 0, digits, integerLen;
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271 | let i, j, zeros;
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272 | // Decimal point?
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273 | if ((integerLen = numStr.indexOf(DECIMAL_SEP)) > -1) {
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274 | numStr = numStr.replace(DECIMAL_SEP, '');
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275 | }
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276 | // Exponential form?
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277 | if ((i = numStr.search(/e/i)) > 0) {
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278 | // Work out the exponent.
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279 | if (integerLen < 0)
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280 | integerLen = i;
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281 | integerLen += +numStr.slice(i + 1);
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282 | numStr = numStr.substring(0, i);
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283 | }
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284 | else if (integerLen < 0) {
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285 | // There was no decimal point or exponent so it is an integer.
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286 | integerLen = numStr.length;
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287 | }
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288 | // Count the number of leading zeros.
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289 | for (i = 0; numStr.charAt(i) === ZERO_CHAR; i++) { /* empty */
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290 | }
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291 | if (i === (zeros = numStr.length)) {
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292 | // The digits are all zero.
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293 | digits = [0];
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294 | integerLen = 1;
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295 | }
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296 | else {
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297 | // Count the number of trailing zeros
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298 | zeros--;
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299 | while (numStr.charAt(zeros) === ZERO_CHAR)
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300 | zeros--;
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301 | // Trailing zeros are insignificant so ignore them
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302 | integerLen -= i;
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303 | digits = [];
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304 | // Convert string to array of digits without leading/trailing zeros.
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305 | for (j = 0; i <= zeros; i++, j++) {
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306 | digits[j] = Number(numStr.charAt(i));
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307 | }
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308 | }
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309 | // If the number overflows the maximum allowed digits then use an exponent.
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310 | if (integerLen > MAX_DIGITS) {
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311 | digits = digits.splice(0, MAX_DIGITS - 1);
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312 | exponent = integerLen - 1;
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313 | integerLen = 1;
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314 | }
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315 | return { digits, exponent, integerLen };
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316 | }
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317 | /**
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318 | * Round the parsed number to the specified number of decimal places
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319 | * This function changes the parsedNumber in-place
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320 | */
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321 | function roundNumber(parsedNumber, minFrac, maxFrac) {
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322 | if (minFrac > maxFrac) {
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323 | throw new Error(`The minimum number of digits after fraction (${minFrac}) is higher than the maximum (${maxFrac}).`);
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324 | }
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325 | let digits = parsedNumber.digits;
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326 | let fractionLen = digits.length - parsedNumber.integerLen;
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327 | const fractionSize = Math.min(Math.max(minFrac, fractionLen), maxFrac);
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328 | // The index of the digit to where rounding is to occur
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329 | let roundAt = fractionSize + parsedNumber.integerLen;
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330 | let digit = digits[roundAt];
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331 | if (roundAt > 0) {
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332 | // Drop fractional digits beyond `roundAt`
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333 | digits.splice(Math.max(parsedNumber.integerLen, roundAt));
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334 | // Set non-fractional digits beyond `roundAt` to 0
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335 | for (let j = roundAt; j < digits.length; j++) {
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336 | digits[j] = 0;
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337 | }
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338 | }
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339 | else {
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340 | // We rounded to zero so reset the parsedNumber
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341 | fractionLen = Math.max(0, fractionLen);
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342 | parsedNumber.integerLen = 1;
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343 | digits.length = Math.max(1, roundAt = fractionSize + 1);
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344 | digits[0] = 0;
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345 | for (let i = 1; i < roundAt; i++)
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346 | digits[i] = 0;
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347 | }
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348 | if (digit >= 5) {
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349 | if (roundAt - 1 < 0) {
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350 | for (let k = 0; k > roundAt; k--) {
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351 | digits.unshift(0);
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352 | parsedNumber.integerLen++;
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353 | }
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354 | digits.unshift(1);
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355 | parsedNumber.integerLen++;
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356 | }
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357 | else {
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358 | digits[roundAt - 1]++;
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359 | }
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360 | }
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361 | // Pad out with zeros to get the required fraction length
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362 | for (; fractionLen < Math.max(0, fractionSize); fractionLen++)
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363 | digits.push(0);
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364 | let dropTrailingZeros = fractionSize !== 0;
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365 | // Minimal length = nb of decimals required + current nb of integers
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366 | // Any number besides that is optional and can be removed if it's a trailing 0
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367 | const minLen = minFrac + parsedNumber.integerLen;
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368 | // Do any carrying, e.g. a digit was rounded up to 10
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369 | const carry = digits.reduceRight(function (carry, d, i, digits) {
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370 | d = d + carry;
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371 | digits[i] = d < 10 ? d : d - 10; // d % 10
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372 | if (dropTrailingZeros) {
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373 | // Do not keep meaningless fractional trailing zeros (e.g. 15.52000 --> 15.52)
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374 | if (digits[i] === 0 && i >= minLen) {
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375 | digits.pop();
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376 | }
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377 | else {
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378 | dropTrailingZeros = false;
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379 | }
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380 | }
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381 | return d >= 10 ? 1 : 0; // Math.floor(d / 10);
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382 | }, 0);
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383 | if (carry) {
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384 | digits.unshift(carry);
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385 | parsedNumber.integerLen++;
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386 | }
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387 | }
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388 | export function parseIntAutoRadix(text) {
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389 | const result = parseInt(text);
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390 | if (isNaN(result)) {
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391 | throw new Error('Invalid integer literal when parsing ' + text);
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392 | }
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393 | return result;
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394 | }
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395 | //# 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maxFraction) {\n        maxFraction = minFraction;\n      }\n    }\n\n    roundNumber(parsedNumber, minFraction, maxFraction);\n\n    let digits = parsedNumber.digits;\n    let integerLen = parsedNumber.integerLen;\n    const exponent = parsedNumber.exponent;\n    let decimals = [];\n    isZero = digits.every(d => !d);\n\n    // pad zeros for small numbers\n    for (; integerLen < minInt; integerLen++) {\n      digits.unshift(0);\n    }\n\n    // pad zeros for small numbers\n    for (; integerLen < 0; integerLen++) {\n      digits.unshift(0);\n    }\n\n    // extract decimals digits\n    if (integerLen > 0) {\n      decimals = digits.splice(integerLen, digits.length);\n    } else {\n      decimals = digits;\n      digits = [0];\n    }\n\n    // format the integer digits with grouping separators\n    const groups = [];\n    if (digits.length >= pattern.lgSize) {\n      groups.unshift(digits.splice(-pattern.lgSize, digits.length).join(''));\n    }\n\n    while (digits.length > 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See `DecimalPipe` for more details.\n *\n * @returns The formatted currency value.\n *\n * @see `formatNumber()`\n * @see `DecimalPipe`\n * @see [Internationalization (i18n) Guide](https://angular.io/guide/i18n-overview)\n *\n * @publicApi\n */\nexport function formatCurrency(\n    value: number, locale: string, currency: string, currencyCode?: string,\n    digitsInfo?: string): string {\n  const format = getLocaleNumberFormat(locale, NumberFormatStyle.Currency);\n  const pattern = parseNumberFormat(format, getLocaleNumberSymbol(locale, NumberSymbol.MinusSign));\n\n  pattern.minFrac = getNumberOfCurrencyDigits(currencyCode!);\n  pattern.maxFrac = pattern.minFrac;\n\n  const res = formatNumberToLocaleString(\n      value, pattern, locale, NumberSymbol.CurrencyGroup, NumberSymbol.CurrencyDecimal, digitsInfo);\n  return res\n      .replace(CURRENCY_CHAR, currency)\n      // if we have 2 time the currency character, the second one is ignored\n      .replace(CURRENCY_CHAR, '')\n      // If there is a spacing between currency character and the value and\n      // the currency character is supressed by passing an empty string, the\n      // spacing character would remain as part of the string. 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See `DecimalPipe` for more details.\n *\n * @returns The formatted percentage value.\n *\n * @see `formatNumber()`\n * @see `DecimalPipe`\n * @see [Internationalization (i18n) Guide](https://angular.io/guide/i18n-overview)\n * @publicApi\n *\n */\nexport function formatPercent(value: number, locale: string, digitsInfo?: string): string {\n  const format = getLocaleNumberFormat(locale, NumberFormatStyle.Percent);\n  const pattern = parseNumberFormat(format, getLocaleNumberSymbol(locale, NumberSymbol.MinusSign));\n  const res = formatNumberToLocaleString(\n      value, pattern, locale, NumberSymbol.Group, NumberSymbol.Decimal, digitsInfo, true);\n  return res.replace(\n      new RegExp(PERCENT_CHAR, 'g'), getLocaleNumberSymbol(locale, NumberSymbol.PercentSign));\n}\n\n/**\n * @ngModule CommonModule\n * @description\n *\n * Formats a number as text, with group sizing, separator, and other\n * parameters based on the locale.\n *\n * @param value The number to format.\n * @param locale A locale code for the locale format rules to use.\n * @param digitsInfo Decimal representation options, specified by a string in the following format:\n * `{minIntegerDigits}.{minFractionDigits}-{maxFractionDigits}`. See `DecimalPipe` for more details.\n *\n * @returns The formatted text string.\n * @see [Internationalization (i18n) Guide](https://angular.io/guide/i18n-overview)\n *\n * @publicApi\n */\nexport function formatNumber(value: number, locale: string, digitsInfo?: string): string {\n  const format = getLocaleNumberFormat(locale, NumberFormatStyle.Decimal);\n  const pattern = parseNumberFormat(format, getLocaleNumberSymbol(locale, NumberSymbol.MinusSign));\n  return formatNumberToLocaleString(\n      value, pattern, locale, NumberSymbol.Group, NumberSymbol.Decimal, digitsInfo);\n}\n\ninterface ParsedNumberFormat {\n  minInt: number;\n  // the minimum number of digits required in the fraction part of the number\n  minFrac: number;\n  // the maximum number of digits required in the fraction part of the number\n  maxFrac: number;\n  // the prefix for a positive number\n  posPre: string;\n  // the suffix for a positive number\n  posSuf: string;\n  // the prefix for a negative number (e.g. `-` or `(`))\n  negPre: string;\n  // the suffix for a negative number (e.g. `)`)\n  negSuf: string;\n  // number of digits in each group of separated digits\n  gSize: number;\n  // number of digits in the last group of digits before the decimal separator\n  lgSize: number;\n}\n\nfunction parseNumberFormat(format: string, minusSign = '-'): ParsedNumberFormat {\n  const p = {\n    minInt: 1,\n    minFrac: 0,\n    maxFrac: 0,\n    posPre: '',\n    posSuf: '',\n    negPre: '',\n    negSuf: '',\n    gSize: 0,\n    lgSize: 0\n  };\n\n  const patternParts = format.split(PATTERN_SEP);\n  const positive = patternParts[0];\n  const negative = patternParts[1];\n\n  const positiveParts = positive.indexOf(DECIMAL_SEP) !== -1 ?\n      positive.split(DECIMAL_SEP) :\n      [\n        positive.substring(0, positive.lastIndexOf(ZERO_CHAR) + 1),\n        positive.substring(positive.lastIndexOf(ZERO_CHAR) + 1)\n      ],\n        integer = positiveParts[0], fraction = positiveParts[1] || '';\n\n  p.posPre = integer.substr(0, integer.indexOf(DIGIT_CHAR));\n\n  for (let i = 0; i < fraction.length; i++) {\n    const ch = fraction.charAt(i);\n    if (ch === ZERO_CHAR) {\n      p.minFrac = p.maxFrac = i + 1;\n    } else if (ch === DIGIT_CHAR) {\n      p.maxFrac = i + 1;\n    } else {\n      p.posSuf += ch;\n    }\n  }\n\n  const groups = integer.split(GROUP_SEP);\n  p.gSize = groups[1] ? groups[1].length : 0;\n  p.lgSize = (groups[2] || groups[1]) ? (groups[2] || groups[1]).length : 0;\n\n  if (negative) {\n    const trunkLen = positive.length - p.posPre.length - p.posSuf.length,\n          pos = negative.indexOf(DIGIT_CHAR);\n\n    p.negPre = negative.substr(0, pos).replace(/'/g, '');\n    p.negSuf = negative.substr(pos + trunkLen).replace(/'/g, '');\n  } else {\n    p.negPre = minusSign + p.posPre;\n    p.negSuf = p.posSuf;\n  }\n\n  return p;\n}\n\ninterface ParsedNumber {\n  // an array of digits containing leading zeros as necessary\n  digits: number[];\n  // the exponent for numbers that would need more than `MAX_DIGITS` digits in `d`\n  exponent: number;\n  // the number of the digits in `d` that are to the left of the decimal point\n  integerLen: number;\n}\n\n// Transforms a parsed number into a percentage by multiplying it by 100\nfunction toPercent(parsedNumber: ParsedNumber): ParsedNumber {\n  // if the number is 0, don't do anything\n  if (parsedNumber.digits[0] === 0) {\n    return parsedNumber;\n  }\n\n  // Getting the current number of decimals\n  const fractionLen = parsedNumber.digits.length - parsedNumber.integerLen;\n  if (parsedNumber.exponent) {\n    parsedNumber.exponent += 2;\n  } else {\n    if (fractionLen === 0) {\n      parsedNumber.digits.push(0, 0);\n    } else if (fractionLen === 1) {\n      parsedNumber.digits.push(0);\n    }\n    parsedNumber.integerLen += 2;\n  }\n\n  return parsedNumber;\n}\n\n/**\n * Parses a number.\n * Significant bits of this parse algorithm came from https://github.com/MikeMcl/big.js/\n */\nfunction parseNumber(num: number): ParsedNumber {\n  let numStr = Math.abs(num) + '';\n  let exponent = 0, digits, integerLen;\n  let i, j, zeros;\n\n  // Decimal point?\n  if ((integerLen = numStr.indexOf(DECIMAL_SEP)) > -1) {\n    numStr = numStr.replace(DECIMAL_SEP, '');\n  }\n\n  // Exponential form?\n  if ((i = numStr.search(/e/i)) > 0) {\n    // Work out the exponent.\n    if (integerLen < 0) integerLen = i;\n    integerLen += +numStr.slice(i + 1);\n    numStr = numStr.substring(0, i);\n  } else if (integerLen < 0) {\n    // There was no decimal point or exponent so it is an integer.\n    integerLen = numStr.length;\n  }\n\n  // Count the number of leading zeros.\n  for (i = 0; numStr.charAt(i) === ZERO_CHAR; i++) { /* empty */\n  }\n\n  if (i === (zeros = numStr.length)) {\n    // The digits are all zero.\n    digits = [0];\n    integerLen = 1;\n  } else {\n    // Count the number of trailing zeros\n    zeros--;\n    while (numStr.charAt(zeros) === ZERO_CHAR) zeros--;\n\n    // Trailing zeros are insignificant so ignore them\n    integerLen -= i;\n    digits = [];\n    // Convert string to array of digits without leading/trailing zeros.\n    for (j = 0; i <= zeros; i++, j++) {\n      digits[j] = Number(numStr.charAt(i));\n    }\n  }\n\n  // If the number overflows the maximum allowed digits then use an exponent.\n  if (integerLen > MAX_DIGITS) {\n    digits = digits.splice(0, MAX_DIGITS - 1);\n    exponent = integerLen - 1;\n    integerLen = 1;\n  }\n\n  return {digits, exponent, integerLen};\n}\n\n/**\n * Round the parsed number to the specified number of decimal places\n * This function changes the parsedNumber in-place\n */\nfunction roundNumber(parsedNumber: ParsedNumber, minFrac: number, maxFrac: number) {\n  if (minFrac > maxFrac) {\n    throw new Error(`The minimum number of digits after fraction (${\n        minFrac}) is higher than the maximum (${maxFrac}).`);\n  }\n\n  let digits = parsedNumber.digits;\n  let fractionLen = digits.length - parsedNumber.integerLen;\n  const fractionSize = Math.min(Math.max(minFrac, fractionLen), maxFrac);\n\n  // The index of the digit to where rounding is to occur\n  let roundAt = fractionSize + parsedNumber.integerLen;\n  let digit = digits[roundAt];\n\n  if (roundAt > 0) {\n    // Drop fractional digits beyond `roundAt`\n    digits.splice(Math.max(parsedNumber.integerLen, roundAt));\n\n    // Set non-fractional digits beyond `roundAt` to 0\n    for (let j = roundAt; j < digits.length; j++) {\n      digits[j] = 0;\n    }\n  } else {\n    // We rounded to zero so reset the parsedNumber\n    fractionLen = Math.max(0, fractionLen);\n    parsedNumber.integerLen = 1;\n    digits.length = Math.max(1, roundAt = fractionSize + 1);\n    digits[0] = 0;\n    for (let i = 1; i < roundAt; i++) digits[i] = 0;\n  }\n\n  if (digit >= 5) {\n    if (roundAt - 1 < 0) {\n      for (let k = 0; k > roundAt; k--) {\n        digits.unshift(0);\n        parsedNumber.integerLen++;\n      }\n      digits.unshift(1);\n      parsedNumber.integerLen++;\n    } else {\n      digits[roundAt - 1]++;\n    }\n  }\n\n  // Pad out with zeros to get the required fraction length\n  for (; fractionLen < Math.max(0, fractionSize); fractionLen++) digits.push(0);\n\n  let dropTrailingZeros = fractionSize !== 0;\n  // Minimal length = nb of decimals required + current nb of integers\n  // Any number besides that is optional and can be removed if it's a trailing 0\n  const minLen = minFrac + parsedNumber.integerLen;\n  // Do any carrying, e.g. a digit was rounded up to 10\n  const carry = digits.reduceRight(function(carry, d, i, digits) {\n    d = d + carry;\n    digits[i] = d < 10 ? d : d - 10;  // d % 10\n    if (dropTrailingZeros) {\n      // Do not keep meaningless fractional trailing zeros (e.g. 15.52000 --> 15.52)\n      if (digits[i] === 0 && i >= minLen) {\n        digits.pop();\n      } else {\n        dropTrailingZeros = false;\n      }\n    }\n    return d >= 10 ? 1 : 0;  // Math.floor(d / 10);\n  }, 0);\n  if (carry) {\n    digits.unshift(carry);\n    parsedNumber.integerLen++;\n  }\n}\n\nexport function parseIntAutoRadix(text: string): number {\n  const result: number = parseInt(text);\n  if (isNaN(result)) {\n    throw new Error('Invalid integer literal when parsing ' + text);\n  }\n  return result;\n}\n"]} |
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