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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*/
/**
* @fileoverview Number format/parse library with locale support
*/
var gadgets = gadgets || {};
gadgets.i18n = gadgets.i18n || {};
/**
* Construct a NumberFormat object based on current locale by using
* the symbol table passed in.
* @constructor
*/
gadgets.i18n.NumberFormat = function(symbol) {
this.symbols_ = symbol;
};
/**
* Apply a predefined pattern to NumberFormat object.
* @param {number} patternType The number that indicates a predefined number
* format pattern.
* @param {string} opt_currency Optional international currency code. This
* determines the currency code/symbol used in format/parse. If not given,
* the currency code for current locale will be used.
*/
gadgets.i18n.NumberFormat.prototype.applyStandardPattern =
function(patternType, opt_currency) {
switch (patternType) {
case gadgets.i18n.DECIMAL_PATTERN:
this.applyPattern(this.symbols_.DECIMAL_PATTERN, opt_currency);
break;
case gadgets.i18n.SCIENTIFIC_PATTERN:
this.applyPattern(this.symbols_.SCIENTIFIC_PATTERN, opt_currency);
break;
case gadgets.i18n.PERCENT_PATTERN:
this.applyPattern(this.symbols_.PERCENT_PATTERN, opt_currency);
break;
case gadgets.i18n.CURRENCY_PATTERN:
this.applyPattern(this.symbols_.CURRENCY_PATTERN, opt_currency);
break;
default:
throw Error('Unsupported pattern type.');
}
};
/**
* Apply a pattern to NumberFormat object.
* @param {string} pattern The number format pattern string.
* @param {string} opt_currency Optional international currency code. This
* determines the currency code/symbol used in format/parse. If not given,
* the currency code for current locale will be used.
*/
gadgets.i18n.NumberFormat.prototype.applyPattern =
function(pattern, opt_currency) {
this.pattern_ = pattern;
this.intlCurrencyCode_ = opt_currency || this.symbols_.DEF_CURRENCY_CODE;
this.currencySymbol_ = gadgets.i18n.CurrencyCodeMap[this.intlCurrencyCode_];
this.maximumIntegerDigits_ = 40;
this.minimumIntegerDigits_ = 1;
this.maximumFractionDigits_ = 3; // invariant, >= minFractionDigits
this.minimumFractionDigits_ = 0;
this.minExponentDigits_ = 0;
this.positivePrefix_ = '';
this.positiveSuffix_ = '';
this.negativePrefix_ = '-';
this.negativeSuffix_ = '';
// The multiplier for use in percent, per mille, etc.
this.multiplier_ = 1;
this.groupingSize_ = 3;
this.decimalSeparatorAlwaysShown_ = false;
this.isCurrencyFormat_ = false;
this.useExponentialNotation_ = false;
this.parsePattern_(this.pattern_);
};
/**
* Parses text string to produce a Number.
*
* This method attempts to parse text starting from position "opt_pos" if it
* is given. Otherwise the parse will start from the beginning of the text.
* When opt_pos presents, opt_pos will be updated to the character next to where
* parsing stops after the call. If an error occurs, opt_pos won't be updated.
*
* @param {string} text the string to be parsed.
* @param {Array} opt_pos position to pass in and get back.
* @return {number} Parsed number, or 0 if the parse fails.
*/
gadgets.i18n.NumberFormat.prototype.parse = function(text, opt_pos) {
var pos = opt_pos || [0];
var start = pos[0];
var ret = 0;
var gotPositive = text.indexOf(this.positivePrefix_, pos[0]) == pos[0];
var gotNegative = text.indexOf(this.negativePrefix_, pos[0]) == pos[0];
// check for the longest match
if (gotPositive && gotNegative) {
if (this.positivePrefix_.length > this.negativePrefix_.length) {
gotNegative = false;
} else if (this.positivePrefix_.length < this.negativePrefix_.length) {
gotPositive = false;
}
}
if (gotPositive) {
pos[0] += this.positivePrefix_.length;
} else if (gotNegative) {
pos[0] += this.negativePrefix_.length;
}
// process digits or Inf, find decimal position
if (text.indexOf(this.symbols_.INFINITY, pos[0]) == pos[0]) {
pos[0] += this.symbols_.INFINITY.length;
ret = Infinity;
} else {
ret = this.parseNumber_(text, pos);
}
// check for suffix
if (gotPositive) {
if (!(text.indexOf(this.positiveSuffix_, pos[0]) == pos[0])) {
pos[0] = start;
return 0;
}
pos[0] += this.positiveSuffix_.length;
} else if (gotNegative) {
if (!(text.indexOf(this.negativeSuffix_, pos[0]) == pos[0])) {
pos[0] = start;
return 0;
}
pos[0] += this.negativeSuffix_.length;
}
return gotNegative ? -ret : ret;
};
/**
* This function will parse a "localized" text into a Number. It needs to
* handle locale specific decimal, grouping, exponent and digits.
*
* @param {string} text The text that need to be parsed.
* @param {Array} pos In/out parsing position. In case of failure, pos value
* won't be changed.
* @return {number} Number value, could be 0.0 if nothing can be parsed.
* @private
*/
gadgets.i18n.NumberFormat.prototype.parseNumber_ = function(text, pos) {
var sawDecimal = false;
var sawExponent = false;
var sawDigit = false;
var scale = 1;
var decimal = this.isCurrencyFormat_ ? this.symbols_.MONETARY_SEP :
this.symbols_.DECIMAL_SEP;
var grouping = this.isCurrencyFormat_ ? this.symbols_.MONETARY_GROUP_SEP :
this.symbols_.GROUP_SEP;
var exponentChar = this.symbols_.EXP_SYMBOL;
var normalizedText = '';
for (; pos[0] < text.length; pos[0]++) {
var ch = text.charAt(pos[0]);
var digit = this.getDigit_(ch);
if (digit >= 0 && digit <= 9) {
normalizedText += digit;
sawDigit = true;
} else if (ch == decimal.charAt(0)) {
if (sawDecimal || sawExponent) {
break;
}
normalizedText += '.';
sawDecimal = true;
} else if (ch == grouping.charAt(0) || '\u00a0' == grouping.charAt(0) &&
ch == ' ' && pos[0] + 1 < text.length &&
this.getDigit_(text.charAt(pos[0] + 1)) >= 0) {
if (sawDecimal || sawExponent) {
break;
}
continue;
} else if (ch == exponentChar.charAt(0)) {
if (sawExponent) {
break;
}
normalizedText += 'E';
sawExponent = true;
} else if (ch == '+' || ch == '-') {
normalizedText += ch;
} else if (ch == this.symbols_.PERCENT.charAt(0)) {
if (scale != 1) {
break;
}
scale = 100;
if (sawDigit) {
pos[0]++; // eat this character if parse end here
break;
}
} else if (ch == this.symbols_.PERMILL.charAt(0)) {
if (scale != 1) {
break;
}
scale = 1000;
if (sawDigit) {
pos[0]++; // eat this character if parse end here
break;
}
} else {
break;
}
}
return parseFloat(normalizedText) / scale;
};
/**
* Formats a Number to produce a string.
*
* @param {number} number The Number to be formatted.
* @return {string} The formatted number string.
*/
gadgets.i18n.NumberFormat.prototype.format = function(number) {
if (isNaN(number)) {
return this.symbols_.NAN;
}
var parts = [];
// in icu code, it is commented that certain computation need to keep the
// negative sign for 0.
var isNegative = number < 0.0 || number == 0.0 && 1 / number < 0.0;
parts.push(isNegative ? this.negativePrefix_ : this.positivePrefix_);
if (!isFinite(number)) {
parts.push(this.symbols_.INFINITY);
} else {
// convert number to non-negative value
number *= isNegative ? -1 : 1;
number *= this.multiplier_;
this.useExponentialNotation_ ?
this.subformatExponential_(number, parts) :
this.subformatFixed_(number, this.minimumIntegerDigits_, parts);
}
parts.push(isNegative ? this.negativeSuffix_ : this.positiveSuffix_);
return parts.join('');
};
/**
* Formats a Number in fraction format.
*
* @param {number} number Value need to be formated.
* @param {number} minIntDigits Minimum integer digits.
* @param {Array} parts This array holds the pieces of formatted string.
* This function will add its formatted pieces to the array.
* @private
*/
gadgets.i18n.NumberFormat.prototype.subformatFixed_ = function(number,
minIntDigits,
parts) {
// round the number
var power = Math.pow(10, this.maximumFractionDigits_);
number = Math.round(number * power);
var intValue = Math.floor(number / power);
var fracValue = Math.floor(number - intValue * power);
var fractionPresent = this.minimumFractionDigits_ > 0 || fracValue > 0;
var intPart = '';
var translatableInt = intValue;
while (translatableInt > 1E20) {
// here it goes beyond double precision, add '0' make it look better
intPart = '0' + intPart;
translatableInt = Math.round(translatableInt / 10);
}
intPart = translatableInt + intPart;
var decimal = this.isCurrencyFormat_ ? this.symbols_.MONETARY_SEP :
this.symbols_.DECIMAL_SEP;
var grouping = this.isCurrencyFormat_ ? this.symbols_.MONETARY_GROUP_SEP :
this.symbols_.GROUP_SEP;
var zeroCode = this.symbols_.ZERO_DIGIT.charCodeAt(0);
var digitLen = intPart.length;
if (intValue > 0 || minIntDigits > 0) {
for (var i = digitLen; i < minIntDigits; i++) {
parts.push(this.symbols_.ZERO_DIGIT);
}
for (var i = 0; i < digitLen; i++) {
parts.push(String.fromCharCode(zeroCode + intPart.charAt(i) * 1));
if (digitLen - i > 1 && this.groupingSize_ > 0 &&
((digitLen - i) % this.groupingSize_ == 1)) {
parts.push(grouping);
}
}
} else if (!fractionPresent) {
// If there is no fraction present, and we haven't printed any
// integer digits, then print a zero.
parts.push(this.symbols_.ZERO_DIGIT);
}
// Output the decimal separator if we always do so.
if (this.decimalSeparatorAlwaysShown_ || fractionPresent) {
parts.push(decimal);
}
var fracPart = '' + (fracValue + power);
var fracLen = fracPart.length;
while (fracPart.charAt(fracLen - 1) == '0' &&
fracLen > this.minimumFractionDigits_ + 1) {
fracLen--;
}
for (var i = 1; i < fracLen; i++) {
parts.push(String.fromCharCode(zeroCode + fracPart.charAt(i) * 1));
}
};
/**
* Formats exponent part of a Number.
*
* @param {number} exponent exponential value.
* @param {Array} parts This array holds the pieces of formatted string.
* This function will add its formatted pieces to the array.
* @private
*/
gadgets.i18n.NumberFormat.prototype.addExponentPart_ = function(exponent,
parts) {
parts.push(this.symbols_.EXP_SYMBOL);
if (exponent < 0) {
exponent = -exponent;
parts.push(this.symbols_.MINUS_SIGN);
}
var exponentDigits = '' + exponent;
for (var i = exponentDigits.length; i < this.minExponentDigits_; i++) {
parts.push(this.symbols_.ZERO_DIGIT);
}
parts.push(exponentDigits);
};
/**
* Formats Number in exponential format.
*
* @param {number} number Value need to be formated.
* @param {Array} parts This array holds the pieces of formatted string.
* This function will add its formatted pieces to the array.
* @private
*/
gadgets.i18n.NumberFormat.prototype.subformatExponential_ = function(number,
parts) {
if (number == 0.0) {
this.subformatFixed_(number, this.minimumIntegerDigits_, parts);
this.addExponentPart_(0, parts);
return;
}
var exponent = Math.floor(Math.log(number) / Math.log(10));
number /= Math.pow(10, exponent);
var minIntDigits = this.minimumIntegerDigits_;
if (this.maximumIntegerDigits_ > 1 &&
this.maximumIntegerDigits_ > this.minimumIntegerDigits_) {
// A repeating range is defined; adjust to it as follows.
// If repeat == 3, we have 6,5,4=>3; 3,2,1=>0; 0,-1,-2=>-3;
// -3,-4,-5=>-6, etc. This takes into account that the
// exponent we have here is off by one from what we expect;
// it is for the format 0.MMMMMx10^n.
while ((exponent % this.maximumIntegerDigits_) != 0) {
number *= 10;
exponent--;
}
minIntDigits = 1;
} else {
// No repeating range is defined; use minimum integer digits.
if (this.minimumIntegerDigits_ < 1) {
exponent++;
number /= 10;
} else {
exponent -= this.minimumIntegerDigits_ - 1;
number *= Math.pow(10, this.minimumIntegerDigits_ - 1);
}
}
this.subformatFixed_(number, minIntDigits, parts);
this.addExponentPart_(exponent, parts);
};
/**
* Returns the digit value of current character. The character could be either
* '0' to '9', or a locale specific digit.
*
* @param {string} ch Character that represents a digit.
* @return {number} The digit value, or -1 on error.
* @private
*/
gadgets.i18n.NumberFormat.prototype.getDigit_ = function(ch) {
var code = ch.charCodeAt(0);
// between '0' to '9'
if (48 <= code && code < 58) {
return code - 48;
} else {
var zeroCode = this.symbols_.ZERO_DIGIT.charCodeAt(0);
return zeroCode <= code && code < zeroCode + 10 ? code - zeroCode : -1;
}
};
// ----------------------------------------------------------------------
// CONSTANTS
// ----------------------------------------------------------------------
// Constants for characters used in programmatic (unlocalized) patterns.
/**
* A zero digit character.
* @type {string}
* @private
*/
gadgets.i18n.NumberFormat.PATTERN_ZERO_DIGIT_ = '0';
/**
* A grouping separator character.
* @type {string}
* @private
*/
gadgets.i18n.NumberFormat.PATTERN_GROUPING_SEPARATOR_ = ',';
/**
* A decimal separator character.
* @type {string}
* @private
*/
gadgets.i18n.NumberFormat.PATTERN_DECIMAL_SEPARATOR_ = '.';
/**
* A per mille character.
* @type {string}
* @private
*/
gadgets.i18n.NumberFormat.PATTERN_PER_MILLE_ = '\u2030';
/**
* A percent character.
* @type {string}
* @private
*/
gadgets.i18n.NumberFormat.PATTERN_PERCENT_ = '%';
/**
* A digit character.
* @type {string}
* @private
*/
gadgets.i18n.NumberFormat.PATTERN_DIGIT_ = '#';
/**
* A separator character.
* @type {string}
* @private
*/
gadgets.i18n.NumberFormat.PATTERN_SEPARATOR_ = ';';
/**
* An exponent character.
* @type {string}
* @private
*/
gadgets.i18n.NumberFormat.PATTERN_EXPONENT_ = 'E';
/**
* A minus character.
* @type {string}
* @private
*/
gadgets.i18n.NumberFormat.PATTERN_MINUS_ = '-';
/**
* A quote character.
* @type {string}
* @private
*/
gadgets.i18n.NumberFormat.PATTERN_CURRENCY_SIGN_ = '\u00A4';
/**
* A quote character.
* @type {string}
* @private
*/
gadgets.i18n.NumberFormat.QUOTE_ = '\'';
/**
* Parses affix part of pattern.
*
* @param {string} pattern Pattern string that need to be parsed.
* @param {Array} pos One element position array to set and receive parsing
* position.
*
* @return {string} affix received from parsing.
* @private
*/
gadgets.i18n.NumberFormat.prototype.parseAffix_ = function(pattern, pos) {
var affix = '';
var inQuote = false;
var len = pattern.length;
for (; pos[0] < len; pos[0]++) {
var ch = pattern.charAt(pos[0]);
if (ch == gadgets.i18n.NumberFormat.QUOTE_) {
if (pos[0] + 1 < len &&
pattern.charAt(pos[0] + 1) == gadgets.i18n.NumberFormat.QUOTE_) {
pos[0]++;
affix += '\''; // 'don''t'
} else {
inQuote = !inQuote;
}
continue;
}
if (inQuote) {
affix += ch;
} else {
switch (ch) {
case gadgets.i18n.NumberFormat.PATTERN_DIGIT_:
case gadgets.i18n.NumberFormat.PATTERN_ZERO_DIGIT_:
case gadgets.i18n.NumberFormat.PATTERN_GROUPING_SEPARATOR_:
case gadgets.i18n.NumberFormat.PATTERN_DECIMAL_SEPARATOR_:
case gadgets.i18n.NumberFormat.PATTERN_SEPARATOR_:
return affix;
case gadgets.i18n.NumberFormat.PATTERN_CURRENCY_SIGN_:
this.isCurrencyFormat_ = true;
if ((pos[0] + 1) < len &&
pattern.charAt(pos[0] + 1) ==
gadgets.i18n.NumberFormat.PATTERN_CURRENCY_SIGN_) {
pos[0]++;
affix += this.intlCurrencyCode_;
} else {
affix += this.currencySymbol_;
}
break;
case gadgets.i18n.NumberFormat.PATTERN_PERCENT_:
if (this.multiplier_ != 1) {
throw Error('Too many percent/permill');
}
this.multiplier_ = 100;
affix += this.symbols_.PERCENT;
break;
case gadgets.i18n.NumberFormat.PATTERN_PER_MILLE_:
if (this.multiplier_ != 1) {
throw Error('Too many percent/permill');
}
this.multiplier_ = 1000;
affix += this.symbols_.PERMILL;
break;
default:
affix += ch;
}
}
}
return affix;
};
/**
* Parses the trunk part of a pattern.
*
* @param {string} pattern Pattern string that need to be parsed.
* @param {Array} pos One element position array to set and receive parsing
* position.
* @private
*/
gadgets.i18n.NumberFormat.prototype.parseTrunk_ = function(pattern, pos) {
var decimalPos = -1;
var digitLeftCount = 0;
var zeroDigitCount = 0;
var digitRightCount = 0;
var groupingCount = -1;
var len = pattern.length;
for (var loop = true; pos[0] < len && loop; pos[0]++) {
var ch = pattern.charAt(pos[0]);
switch (ch) {
case gadgets.i18n.NumberFormat.PATTERN_DIGIT_:
if (zeroDigitCount > 0) {
digitRightCount++;
} else {
digitLeftCount++;
}
if (groupingCount >= 0 && decimalPos < 0) {
groupingCount++;
}
break;
case gadgets.i18n.NumberFormat.PATTERN_ZERO_DIGIT_:
if (digitRightCount > 0) {
throw Error('Unexpected "0" in pattern "' + pattern + '"');
}
zeroDigitCount++;
if (groupingCount >= 0 && decimalPos < 0) {
groupingCount++;
}
break;
case gadgets.i18n.NumberFormat.PATTERN_GROUPING_SEPARATOR_:
groupingCount = 0;
break;
case gadgets.i18n.NumberFormat.PATTERN_DECIMAL_SEPARATOR_:
if (decimalPos >= 0) {
throw Error('Multiple decimal separators in pattern "'
+ pattern + '"');
}
decimalPos = digitLeftCount + zeroDigitCount + digitRightCount;
break;
case gadgets.i18n.NumberFormat.PATTERN_EXPONENT_:
if (this.useExponentialNotation_) {
throw Error('Multiple exponential symbols in pattern "'
+ pattern + '"');
}
this.useExponentialNotation_ = true;
this.minExponentDigits_ = 0;
// Use lookahead to parse out the exponential part
// of the pattern, then jump into phase 2.
while ((pos[0] + 1) < len && pattern.charAt(pos[0] + 1) ==
this.symbols_.ZERO_DIGIT.charAt(0)) {
pos[0]++;
this.minExponentDigits_++;
}
if ((digitLeftCount + zeroDigitCount) < 1 ||
this.minExponentDigits_ < 1) {
throw Error('Malformed exponential pattern "' + pattern + '"');
}
loop = false;
break;
default:
pos[0]--;
loop = false;
break;
}
}
if (zeroDigitCount == 0 && digitLeftCount > 0 && decimalPos >= 0) {
// Handle '###.###' and '###.' and '.###'
var n = decimalPos;
if (n == 0) { // Handle '.###'
n++;
}
digitRightCount = digitLeftCount - n;
digitLeftCount = n - 1;
zeroDigitCount = 1;
}
// Do syntax checking on the digits.
if (decimalPos < 0 && digitRightCount > 0 ||
decimalPos >= 0 && (decimalPos < digitLeftCount ||
decimalPos > digitLeftCount + zeroDigitCount) ||
groupingCount == 0) {
throw Error('Malformed pattern "' + pattern + '"');
}
var totalDigits = digitLeftCount + zeroDigitCount + digitRightCount;
this.maximumFractionDigits_ = decimalPos >= 0 ? totalDigits - decimalPos : 0;
if (decimalPos >= 0) {
this.minimumFractionDigits_ = digitLeftCount + zeroDigitCount - decimalPos;
if (this.minimumFractionDigits_ < 0) {
this.minimumFractionDigits_ = 0;
}
}
// The effectiveDecimalPos is the position the decimal is at or would be at
// if there is no decimal. Note that if decimalPos<0, then digitTotalCount ==
// digitLeftCount + zeroDigitCount.
var effectiveDecimalPos = decimalPos >= 0 ? decimalPos : totalDigits;
this.minimumIntegerDigits_ = effectiveDecimalPos - digitLeftCount;
if (this.useExponentialNotation_) {
this.maximumIntegerDigits_ = digitLeftCount + this.minimumIntegerDigits_;
// in exponential display, we need to at least show something.
if (this.maximumFractionDigits_ == 0 && this.minimumIntegerDigits_ == 0) {
this.minimumIntegerDigits_ = 1;
}
}
this.groupingSize_ = Math.max(0, groupingCount);
this.decimalSeparatorAlwaysShown_ = decimalPos == 0 ||
decimalPos == totalDigits;
};
/**
* Parses provided pattern, result are stored in member variables.
*
* @param {string} pattern string pattern being applied.
* @private
*/
gadgets.i18n.NumberFormat.prototype.parsePattern_ = function(pattern) {
var pos = [0];
this.positivePrefix_ = this.parseAffix_(pattern, pos);
var trunkStart = pos[0];
this.parseTrunk_(pattern, pos);
var trunkLen = pos[0] - trunkStart;
this.positiveSuffix_ = this.parseAffix_(pattern, pos);
if (pos[0] < pattern.length &&
pattern.charAt(pos[0]) == gadgets.i18n.NumberFormat.PATTERN_SEPARATOR_) {
pos[0]++;
this.negativePrefix_ = this.parseAffix_(pattern, pos);
// we assume this part is identical to positive part.
// user must make sure the pattern is correctly constructed.
pos[0] += trunkLen;
this.negativeSuffix_ = this.parseAffix_(pattern, pos);
}
};
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