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intl/lib/src/intl/number_format.dart

Index: intl/lib/src/intl/number_format.dart
diff --git a/intl/lib/src/intl/number_format.dart b/intl/lib/src/intl/number_format.dart
deleted file mode 100644
index 9e0de51c8846f5971dafa85da0b935e6ad7575a5..0000000000000000000000000000000000000000
--- a/intl/lib/src/intl/number_format.dart
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@@ -1,1081 +0,0 @@
-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-part of intl;
-
-/**
- * Provides the ability to format a number in a locale-specific way. The
- * format is specified as a pattern using a subset of the ICU formatting
- * patterns.
- *
- * - `0` A single digit
- * - `#` A single digit, omitted if the value is zero
- * - `.` Decimal separator
- * - `-` Minus sign
- * - `,` Grouping separator
- * - `E` Separates mantissa and expontent
- * - `+` - Before an exponent, indicates it should be prefixed with a plus sign.
- * - `%` - In prefix or suffix, multiply by 100 and show as percentage
- * - `‰ (\u2030)` In prefix or suffix, multiply by 1000 and show as per mille
- * - `¤ (\u00A4)` Currency sign, replaced by currency name
- * - `'` Used to quote special characters
- * - `;` Used to separate the positive and negative patterns if both are present
- *
- * For example,
- *       var f = new NumberFormat("###.0#", "en_US");
- *       print(f.format(12.345));
- *       ==> 12.34
- * If the locale is not specified, it will default to the current locale. If
- * the format is not specified it will print in a basic format with at least
- * one integer digit and three fraction digits.
- *
- * There are also standard patterns available via the special constructors. e.g.
- *       var percent = new NumberFormat.percentFormat("ar");
- *       var eurosInUSFormat = new NumberFormat.currencyPattern("en_US", "€");
- * There are four such constructors: decimalFormat, percentFormat,
- * scientificFormat and currencyFormat. However, at the moment,
- * scientificFormat prints only as equivalent to "#E0" and does not take
- * into account significant digits. The currencyFormat will default to the
- * three-letter name of the currency if no explicit name/symbol is provided.
- */
-class NumberFormat {
-  /** Variables to determine how number printing behaves. */
-  // TODO(alanknight): If these remain as variables and are set based on the
-  // pattern, can we make them final?
-  String _negativePrefix = '-';
-  String _positivePrefix = '';
-  String _negativeSuffix = '';
-  String _positiveSuffix = '';
-  /**
-   * How many numbers in a group when using punctuation to group digits in
-   * large numbers. e.g. in en_US: "1,000,000" has a grouping size of 3 digits
-   * between commas.
-   */
-  int _groupingSize = 3;
-  /**
-   * In some formats the last grouping size may be different than previous
-   * ones, e.g. Hindi.
-   */
-  int _finalGroupingSize = 3;
-  /**
-   * Set to true if the format has explicitly set the grouping size.
-   */
-  bool _groupingSizeSetExplicitly = false;
-  bool _decimalSeparatorAlwaysShown = false;
-  bool _useSignForPositiveExponent = false;
-  bool _useExponentialNotation = false;
-
-  int maximumIntegerDigits = 40;
-  int minimumIntegerDigits = 1;
-  int maximumFractionDigits = 3;
-  int minimumFractionDigits = 0;
-  int minimumExponentDigits = 0;
-
-  /**
-   * For percent and permille, what are we multiplying by in order to
-   * get the printed value, e.g. 100 for percent.
-   */
-  int get _multiplier => _internalMultiplier;
-  set _multiplier(int x) {
-    _internalMultiplier = x;
-    _multiplierDigits = (log(_multiplier) / LN10).round();
-  }
-  int _internalMultiplier = 1;
-
-  /** How many digits are there in the [_multiplier]. */
-  int _multiplierDigits = 0;
-
-  /**
-   * Stores the pattern used to create this format. This isn't used, but
-   * is helpful in debugging.
-   */
-  String _pattern;
-
-  /** The locale in which we print numbers. */
-  final String _locale;
-
-  /** Caches the symbols used for our locale. */
-  NumberSymbols _symbols;
-
-  /** The name (or symbol) of the currency to print. */
-  String currencyName;
-
-  /**
-   * Transient internal state in which to build up the result of the format
-   * operation. We can have this be just an instance variable because Dart is
-   * single-threaded and unless we do an asynchronous operation in the process
-   * of formatting then there will only ever be one number being formatted
-   * at a time. In languages with threads we'd need to pass this on the stack.
-   */
-  final StringBuffer _buffer = new StringBuffer();
-
-  /**
-   * Create a number format that prints using [newPattern] as it applies in
-   * [locale].
-   */
-  factory NumberFormat([String newPattern, String locale]) =>
-      new NumberFormat._forPattern(locale, (x) => newPattern);
-
-  /** Create a number format that prints as DECIMAL_PATTERN. */
-  NumberFormat.decimalPattern([String locale])
-      : this._forPattern(locale, (x) => x.DECIMAL_PATTERN);
-
-  /** Create a number format that prints as PERCENT_PATTERN. */
-  NumberFormat.percentPattern([String locale])
-      : this._forPattern(locale, (x) => x.PERCENT_PATTERN);
-
-  /** Create a number format that prints as SCIENTIFIC_PATTERN. */
-  NumberFormat.scientificPattern([String locale])
-      : this._forPattern(locale, (x) => x.SCIENTIFIC_PATTERN);
-
-  /**
-   * Create a number format that prints as CURRENCY_PATTERN. If provided,
-   * use [nameOrSymbol] in place of the default currency name. e.g.
-   *        var eurosInCurrentLocale = new NumberFormat
-   *            .currencyPattern(Intl.defaultLocale, "€");
-   */
-  NumberFormat.currencyPattern([String locale, String nameOrSymbol])
-      : this._forPattern(locale, (x) => x.CURRENCY_PATTERN, nameOrSymbol);
-
-  /**
-   * Create a number format that prints in a pattern we get from
-   * the [getPattern] function using the locale [locale].
-   */
-  NumberFormat._forPattern(String locale, Function getPattern,
-      [this.currencyName])
-      : _locale = Intl.verifiedLocale(locale, localeExists) {
-    _symbols = numberFormatSymbols[_locale];
-    if (currencyName == null) {
-      currencyName = _symbols.DEF_CURRENCY_CODE;
-    }
-    _setPattern(getPattern(_symbols));
-  }
-
-  /**
-   * Return the locale code in which we operate, e.g. 'en_US' or 'pt'.
-   */
-  String get locale => _locale;
-
-  /**
-   * Return true if the locale exists, or if it is null. The null case
-   * is interpreted to mean that we use the default locale.
-   */
-  static bool localeExists(localeName) {
-    if (localeName == null) return false;
-    return numberFormatSymbols.containsKey(localeName);
-  }
-
-  /**
-   * Return the symbols which are used in our locale. Cache them to avoid
-   * repeated lookup.
-   */
-  NumberSymbols get symbols => _symbols;
-
-  /**
-   * Format [number] according to our pattern and return the formatted string.
-   */
-  String format(number) {
-    if (_isNaN(number)) return symbols.NAN;
-    if (_isInfinite(number)) return "${_signPrefix(number)}${symbols.INFINITY}";
-
-    _add(_signPrefix(number));
-    _formatNumber(number.abs());
-    _add(_signSuffix(number));
-
-    var result = _buffer.toString();
-    _buffer.clear();
-    return result;
-  }
-
-  /**
-   * Parse the number represented by the string. If it's not
-   * parseable, throws a [FormatException].
-   */
-  num parse(String text) => new _NumberParser(this, text).value;
-
-  /**
-   * Format the main part of the number in the form dictated by the pattern.
-   */
-  void _formatNumber(number) {
-    if (_useExponentialNotation) {
-      _formatExponential(number);
-    } else {
-      _formatFixed(number);
-    }
-  }
-
-  /** Format the number in exponential notation. */
-  void _formatExponential(num number) {
-    if (number == 0.0) {
-      _formatFixed(number);
-      _formatExponent(0);
-      return;
-    }
-
-    var exponent = (log(number) / log(10)).floor();
-    var mantissa = number / pow(10.0, exponent);
-
-    var minIntDigits = minimumIntegerDigits;
-    if (maximumIntegerDigits > 1 &&
-        maximumIntegerDigits > 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 % maximumIntegerDigits) != 0) {
-        mantissa *= 10;
-        exponent--;
-      }
-      minIntDigits = 1;
-    } else {
-      // No repeating range is defined, use minimum integer digits.
-      if (minimumIntegerDigits < 1) {
-        exponent++;
-        mantissa /= 10;
-      } else {
-        exponent -= minimumIntegerDigits - 1;
-        mantissa *= pow(10, minimumIntegerDigits - 1);
-      }
-    }
-    _formatFixed(mantissa);
-    _formatExponent(exponent);
-  }
-
-  /**
-   * Format the exponent portion, e.g. in "1.3e-5" the "e-5".
-   */
-  void _formatExponent(num exponent) {
-    _add(symbols.EXP_SYMBOL);
-    if (exponent < 0) {
-      exponent = -exponent;
-      _add(symbols.MINUS_SIGN);
-    } else if (_useSignForPositiveExponent) {
-      _add(symbols.PLUS_SIGN);
-    }
-    _pad(minimumExponentDigits, exponent.toString());
-  }
-
-  /** Used to test if we have exceeded Javascript integer limits. */
-  final _maxInt = pow(2, 52);
-
-  /**
-   * Helpers to check numbers that don't conform to the [num] interface,
-   * e.g. Int64
-   */
-  _isInfinite(number) => number is num ? number.isInfinite : false;
-  _isNaN(number) => number is num ? number.isNaN : false;
-  _round(number) => number is num ? number.round() : number;
-  _floor(number) => number is num ? number.floor() : number;
-
-  /**
-   * Format the basic number portion, inluding the fractional digits.
-   */
-  void _formatFixed(number) {
-    var integerPart;
-    int fractionPart;
-    int extraIntegerDigits;
-
-    final power = pow(10, maximumFractionDigits);
-    final digitMultiplier = power * _multiplier;
-
-    if (_isInfinite(number)) {
-      integerPart = number.toInt();
-      extraIntegerDigits = 0;
-      fractionPart = 0;
-    } else {
-      // We have three possible pieces. First, the basic integer part. If this
-      // is a percent or permille, the additional 2 or 3 digits. Finally the
-      // fractional part.
-      // We avoid multiplying the number because it might overflow if we have
-      // a fixed-size integer type, so we extract each of the three as an
-      // integer pieces.
-      integerPart = _floor(number);
-      var fraction = number - integerPart;
-      // Multiply out to the number of decimal places and the percent, then
-      // round. For fixed-size integer types this should always be zero, so
-      // multiplying is OK.
-      var remainingDigits = _round(fraction * digitMultiplier).toInt();
-      // However, in rounding we may overflow into the main digits.
-      if (remainingDigits >= digitMultiplier) {
-        integerPart++;
-        remainingDigits -= digitMultiplier;
-      }
-      // Separate out the extra integer parts from the fraction part.
-      extraIntegerDigits = remainingDigits ~/ power;
-      fractionPart = remainingDigits % power;
-    }
-    var fractionPresent = minimumFractionDigits > 0 || fractionPart > 0;
-
-    var integerDigits = _integerDigits(integerPart, extraIntegerDigits);
-    var digitLength = integerDigits.length;
-
-    if (_hasIntegerDigits(integerDigits)) {
-      _pad(minimumIntegerDigits - digitLength);
-      for (var i = 0; i < digitLength; i++) {
-        _addDigit(integerDigits.codeUnitAt(i));
-        _group(digitLength, i);
-      }
-    } else if (!fractionPresent) {
-      // If neither fraction nor integer part exists, just print zero.
-      _addZero();
-    }
-
-    _decimalSeparator(fractionPresent);
-    _formatFractionPart((fractionPart + power).toString());
-  }
-
-  /**
-   * Compute the raw integer digits which will then be printed with
-   * grouping and translated to localized digits.
-   */
-  String _integerDigits(integerPart, extraIntegerDigits) {
-    // If the int part is larger than 2^52 and we're on Javascript (so it's
-    // really a float) it will lose precision, so pad out the rest of it
-    // with zeros. Check for Javascript by seeing if an integer is double.
-    var paddingDigits = '';
-    if (1 is double && integerPart is num && integerPart > _maxInt) {
-      var howManyDigitsTooBig = (log(integerPart) / LN10).ceil() - 16;
-      var divisor = pow(10, howManyDigitsTooBig).round();
-      paddingDigits = symbols.ZERO_DIGIT * howManyDigitsTooBig.toInt();
-      integerPart = (integerPart / divisor).truncate();
-    }
-
-    var extra = extraIntegerDigits == 0 ? '' : extraIntegerDigits.toString();
-    var intDigits = _mainIntegerDigits(integerPart);
-    var paddedExtra =
-        intDigits.isEmpty ? extra : extra.padLeft(_multiplierDigits, '0');
-    return "${intDigits}${paddedExtra}${paddingDigits}";
-  }
-
-  /**
-   * The digit string of the integer part. This is the empty string if the
-   * integer part is zero and otherwise is the toString() of the integer
-   * part, stripping off any minus sign.
-   */
-  String _mainIntegerDigits(integer) {
-    if (integer == 0) return '';
-    var digits = integer.toString();
-    // If we have a fixed-length int representation, it can have a negative
-    // number whose negation is also negative, e.g. 2^-63 in 64-bit.
-    // Remove the minus sign.
-    return digits.startsWith('-') ? digits.substring(1) : digits;
-  }
-
-  /**
-   * Format the part after the decimal place in a fixed point number.
-   */
-  void _formatFractionPart(String fractionPart) {
-    var fractionCodes = fractionPart.codeUnits;
-    var fractionLength = fractionPart.length;
-    while (fractionCodes[fractionLength - 1] == _zero &&
-        fractionLength > minimumFractionDigits + 1) {
-      fractionLength--;
-    }
-    for (var i = 1; i < fractionLength; i++) {
-      _addDigit(fractionCodes[i]);
-    }
-  }
-
-  /** Print the decimal separator if appropriate. */
-  void _decimalSeparator(bool fractionPresent) {
-    if (_decimalSeparatorAlwaysShown || fractionPresent) {
-      _add(symbols.DECIMAL_SEP);
-    }
-  }
-
-  /**
-   * Return true if we have a main integer part which is printable, either
-   * because we have digits left of the decimal point (this may include digits
-   * which have been moved left because of percent or permille formatting),
-   * or because the minimum number of printable digits is greater than 1.
-   */
-  bool _hasIntegerDigits(String digits) =>
-      digits.isNotEmpty || minimumIntegerDigits > 0;
-
-  /** A group of methods that provide support for writing digits and other
-   * required characters into [_buffer] easily.
-   */
-  void _add(String x) {
-    _buffer.write(x);
-  }
-  void _addCharCode(int x) {
-    _buffer.writeCharCode(x);
-  }
-  void _addZero() {
-    _buffer.write(symbols.ZERO_DIGIT);
-  }
-  void _addDigit(int x) {
-    _buffer.writeCharCode(_localeZero + x - _zero);
-  }
-
-  /** Print padding up to [numberOfDigits] above what's included in [basic]. */
-  void _pad(int numberOfDigits, [String basic = '']) {
-    for (var i = 0; i < numberOfDigits - basic.length; i++) {
-      _add(symbols.ZERO_DIGIT);
-    }
-    for (var x in basic.codeUnits) {
-      _addDigit(x);
-    }
-  }
-
-  /**
-   * We are printing the digits of the number from left to right. We may need
-   * to print a thousands separator or other grouping character as appropriate
-   * to the locale. So we find how many places we are from the end of the number
-   * by subtracting our current [position] from the [totalLength] and printing
-   * the separator character every [_groupingSize] digits, with the final
-   * grouping possibly being of a different size, [_finalGroupingSize].
-   */
-  void _group(int totalLength, int position) {
-    var distanceFromEnd = totalLength - position;
-    if (distanceFromEnd <= 1 || _groupingSize <= 0) return;
-    if (distanceFromEnd == _finalGroupingSize + 1) {
-      _add(symbols.GROUP_SEP);
-    } else if ((distanceFromEnd > _finalGroupingSize) &&
-        (distanceFromEnd - _finalGroupingSize) % _groupingSize == 1) {
-      _add(symbols.GROUP_SEP);
-    }
-  }
-
-  /** Returns the code point for the character '0'. */
-  final _zero = '0'.codeUnits.first;
-
-  /** Returns the code point for the locale's zero digit. */
-  // Note that there is a slight risk of a locale's zero digit not fitting
-  // into a single code unit, but it seems very unlikely, and if it did,
-  // there's a pretty good chance that our assumptions about being able to do
-  // arithmetic on it would also be invalid.
-  get _localeZero => symbols.ZERO_DIGIT.codeUnits.first;
-
-  /**
-   * Returns the prefix for [x] based on whether it's positive or negative.
-   * In en_US this would be '' and '-' respectively.
-   */
-  String _signPrefix(x) => x.isNegative ? _negativePrefix : _positivePrefix;
-
-  /**
-   * Returns the suffix for [x] based on wether it's positive or negative.
-   * In en_US there are no suffixes for positive or negative.
-   */
-  String _signSuffix(x) => x.isNegative ? _negativeSuffix : _positiveSuffix;
-
-  void _setPattern(String newPattern) {
-    if (newPattern == null) return;
-    // Make spaces non-breaking
-    _pattern = newPattern.replaceAll(' ', '\u00a0');
-    var parser = new _NumberFormatParser(this, newPattern, currencyName);
-    parser.parse();
-  }
-
-  String toString() => "NumberFormat($_locale, $_pattern)";
-}
-
-/**
- *  A one-time object for parsing a particular numeric string. One-time here
- * means an instance can only parse one string. This is implemented by
- * transforming from a locale-specific format to one that the system can parse,
- * then calls the system parsing methods on it.
- */
-class _NumberParser {
-
-  /** The format for which we are parsing. */
-  final NumberFormat format;
-
-  /** The text we are parsing. */
-  final String text;
-
-  /** What we use to iterate over the input text. */
-  final _Stream input;
-
-  /**
-   * The result of parsing [text] according to [format]. Automatically
-   * populated in the constructor.
-   */
-  num value;
-
-  /** The symbols used by our format. */
-  NumberSymbols get symbols => format.symbols;
-
-  /** Where we accumulate the normalized representation of the number. */
-  final StringBuffer _normalized = new StringBuffer();
-
-  /**
-   * Did we see something that indicates this is, or at least might be,
-   * a positive number.
-   */
-  bool gotPositive = false;
-
-  /**
-   * Did we see something that indicates this is, or at least might be,
-   * a negative number.
-   */
-  bool gotNegative = false;
-  /**
-   * Did we see the required positive suffix at the end. Should
-   * match [gotPositive].
-   */
-  bool gotPositiveSuffix = false;
-  /**
-   * Did we see the required negative suffix at the end. Should
-   * match [gotNegative].
-   */
-  bool gotNegativeSuffix = false;
-
-  /** Should we stop parsing before hitting the end of the string. */
-  bool done = false;
-
-  /** Have we already skipped over any required prefixes. */
-  bool prefixesSkipped = false;
-
-  /** If the number is percent or permill, what do we divide by at the end. */
-  int scale = 1;
-
-  String get _positivePrefix => format._positivePrefix;
-  String get _negativePrefix => format._negativePrefix;
-  String get _positiveSuffix => format._positiveSuffix;
-  String get _negativeSuffix => format._negativeSuffix;
-  int get _zero => format._zero;
-  int get _localeZero => format._localeZero;
-
-  /**
-   *  Create a new [_NumberParser] on which we can call parse().
-   */
-  _NumberParser(this.format, text)
-      : this.text = text,
-        this.input = new _Stream(text) {
-    value = parse();
-  }
-
-  /**
-   *  The strings we might replace with functions that return the replacement
-   * values. They are functions because we might need to check something
-   * in the context. Note that the ordering is important here. For example,
-   * [symbols.PERCENT] might be " %", and we must handle that before we
-   * look at an individual space.
-   */
-  Map<String, Function> get replacements => _replacements == null
-      ? _replacements = _initializeReplacements()
-      : _replacements;
-
-  var _replacements;
-
-  Map _initializeReplacements() => {
-    symbols.DECIMAL_SEP: () => '.',
-    symbols.EXP_SYMBOL: () => 'E',
-    symbols.GROUP_SEP: handleSpace,
-    symbols.PERCENT: () {
-      scale = _NumberFormatParser._PERCENT_SCALE;
-      return '';
-    },
-    symbols.PERMILL: () {
-      scale = _NumberFormatParser._PER_MILLE_SCALE;
-      return '';
-    },
-    ' ': handleSpace,
-    '\u00a0': handleSpace,
-    '+': () => '+',
-    '-': () => '-',
-  };
-
-  invalidFormat() =>
-      throw new FormatException("Invalid number: ${input.contents}");
-
-  /**
-   * Replace a space in the number with the normalized form. If space is not
-   * a significant character (normally grouping) then it's just invalid. If it
-   * is the grouping character, then it's only valid if it's followed by a
-   * digit. e.g. '$12 345.00'
-   */
-  handleSpace() =>
-      groupingIsNotASpaceOrElseItIsSpaceFollowedByADigit ? '' : invalidFormat();
-
-  /**
-   * Determine if a space is a valid character in the number. See [handleSpace].
-   */
-  bool get groupingIsNotASpaceOrElseItIsSpaceFollowedByADigit {
-    if (symbols.GROUP_SEP != '\u00a0' || symbols.GROUP_SEP != ' ') return true;
-    var peeked = input.peek(symbols.GROUP_SEP.length + 1);
-    return asDigit(peeked[peeked.length - 1]) != null;
-  }
-
-  /**
-   * Turn [char] into a number representing a digit, or null if it doesn't
-   * represent a digit in this locale.
-   */
-  int asDigit(String char) {
-    var charCode = char.codeUnitAt(0);
-    var digitValue = charCode - _localeZero;
-    if (digitValue >= 0 && digitValue < 10) {
-      return digitValue;
-    } else {
-      return null;
-    }
-  }
-
-  /**
-   * Check to see if the input begins with either the positive or negative
-   * prefixes. Set the [gotPositive] and [gotNegative] variables accordingly.
-   */
-  void checkPrefixes({bool skip: false}) {
-    bool checkPrefix(String prefix, skip) {
-      var matched = prefix.isNotEmpty && input.startsWith(prefix);
-      if (skip && matched) input.read(prefix.length);
-      return matched;
-    }
-
-    // TODO(alanknight): There's a faint possibility of a bug here where
-    // a positive prefix is followed by a negative prefix that's also a valid
-    // part of the number, but that seems very unlikely.
-    if (checkPrefix(_positivePrefix, skip)) gotPositive = true;
-    if (checkPrefix(_negativePrefix, skip)) gotNegative = true;
-
-    // Copied from Closure. It doesn't seem to be necessary to pass the test
-    // suite, so I'm not sure it's really needed.
-    if (gotPositive && gotNegative) {
-      if (_positivePrefix.length > _negativePrefix.length) {
-        gotNegative = false;
-      } else if (_negativePrefix.length > _positivePrefix.length) {
-        gotPositive = false;
-      }
-    }
-  }
-
-  /**
-   * If the rest of our input is either the positive or negative suffix,
-   * set [gotPositiveSuffix] or [gotNegativeSuffix] accordingly.
-   */
-  void checkSuffixes() {
-    var remainder = input.rest();
-    if (remainder == _positiveSuffix) gotPositiveSuffix = true;
-    if (remainder == _negativeSuffix) gotNegativeSuffix = true;
-  }
-
-  /**
-   * We've encountered a character that's not a digit. Go through our
-   * replacement rules looking for how to handle it. If we see something
-   * that's not a digit and doesn't have a replacement, then we're done
-   * and the number is probably invalid.
-   */
-  void processNonDigit() {
-    for (var key in replacements.keys) {
-      if (input.startsWith(key)) {
-        _normalized.write(replacements[key]());
-        input.read(key.length);
-        return;
-      }
-    }
-    // It might just be a prefix that we haven't skipped. We don't want to
-    // skip them initially because they might also be semantically meaningful,
-    // e.g. leading %. So we allow them through the loop, but only once.
-    if (input.index == 0 && !prefixesSkipped) {
-      prefixesSkipped = true;
-      checkPrefixes(skip: true);
-    } else {
-      done = true;
-    }
-  }
-
-  /**
-   * Parse [text] and return the resulting number. Throws [FormatException]
-   * if we can't parse it.
-   */
-  num parse() {
-    if (text == symbols.NAN) return double.NAN;
-    if (text == "$_positivePrefix${symbols.INFINITY}$_positiveSuffix") {
-      return double.INFINITY;
-    }
-    if (text == "$_negativePrefix${symbols.INFINITY}$_negativeSuffix") {
-      return double.NEGATIVE_INFINITY;
-    }
-
-    checkPrefixes();
-    var parsed = parseNumber(input);
-
-    if (gotPositive && !gotPositiveSuffix) invalidNumber();
-    if (gotNegative && !gotNegativeSuffix) invalidNumber();
-    if (!input.atEnd()) invalidNumber();
-
-    return parsed;
-  }
-
-  /** The number is invalid, throw a [FormatException]. */
-  void invalidNumber() =>
-      throw new FormatException("Invalid Number: ${input.contents}");
-
-  /**
-   * Parse the number portion of the input, i.e. not any prefixes or suffixes,
-   * and assuming NaN and Infinity are already handled.
-   */
-  num parseNumber(_Stream input) {
-    while (!done && !input.atEnd()) {
-      int digit = asDigit(input.peek());
-      if (digit != null) {
-        _normalized.writeCharCode(_zero + digit);
-        input.next();
-      } else {
-        processNonDigit();
-      }
-      checkSuffixes();
-    }
-
-    var normalizedText = _normalized.toString();
-    num parsed = int.parse(normalizedText, onError: (message) => null);
-    if (parsed == null) parsed = double.parse(normalizedText);
-    return parsed / scale;
-  }
-}
-
-/**
- * Private class that parses the numeric formatting pattern and sets the
- * variables in [format] to appropriate values. Instances of this are
- * transient and store parsing state in instance variables, so can only be used
- * to parse a single pattern.
- */
-class _NumberFormatParser {
-
-  /**
-   * The special characters in the pattern language. All others are treated
-   * as literals.
-   */
-  static const _PATTERN_SEPARATOR = ';';
-  static const _QUOTE = "'";
-  static const _PATTERN_DIGIT = '#';
-  static const _PATTERN_ZERO_DIGIT = '0';
-  static const _PATTERN_GROUPING_SEPARATOR = ',';
-  static const _PATTERN_DECIMAL_SEPARATOR = '.';
-  static const _PATTERN_CURRENCY_SIGN = '\u00A4';
-  static const _PATTERN_PER_MILLE = '\u2030';
-  static const _PER_MILLE_SCALE = 1000;
-  static const _PATTERN_PERCENT = '%';
-  static const _PERCENT_SCALE = 100;
-  static const _PATTERN_EXPONENT = 'E';
-  static const _PATTERN_PLUS = '+';
-
-  /** The format whose state we are setting. */
-  final NumberFormat format;
-
-  /** The pattern we are parsing. */
-  final _StringIterator pattern;
-
-  /** We can be passed a specific currency symbol, regardless of the locale. */
-  String currencyName;
-
-  /**
-   * Create a new [_NumberFormatParser] for a particular [NumberFormat] and
-   * [input] pattern.
-   */
-  _NumberFormatParser(this.format, input, this.currencyName)
-      : pattern = _iterator(input) {
-    pattern.moveNext();
-  }
-
-  /** The [NumberSymbols] for the locale in which our [format] prints. */
-  NumberSymbols get symbols => format.symbols;
-
-  /** Parse the input pattern and set the values. */
-  void parse() {
-    format._positivePrefix = _parseAffix();
-    var trunk = _parseTrunk();
-    format._positiveSuffix = _parseAffix();
-    // If we have separate positive and negative patterns, now parse the
-    // the negative version.
-    if (pattern.current == _NumberFormatParser._PATTERN_SEPARATOR) {
-      pattern.moveNext();
-      format._negativePrefix = _parseAffix();
-      // Skip over the negative trunk, verifying that it's identical to the
-      // positive trunk.
-      for (var each in _iterable(trunk)) {
-        if (pattern.current != each && pattern.current != null) {
-          throw new FormatException(
-              "Positive and negative trunks must be the same");
-        }
-        pattern.moveNext();
-      }
-      format._negativeSuffix = _parseAffix();
-    } else {
-      // If no negative affix is specified, they share the same positive affix.
-      format._negativePrefix = format._negativePrefix + format._positivePrefix;
-      format._negativeSuffix = format._positiveSuffix + format._negativeSuffix;
-    }
-  }
-
-  /**
-   * Variable used in parsing prefixes and suffixes to keep track of
-   * whether or not we are in a quoted region.
-   */
-  bool inQuote = false;
-
-  /**
-   * Parse a prefix or suffix and return the prefix/suffix string. Note that
-   * this also may modify the state of [format].
-   */
-  String _parseAffix() {
-    var affix = new StringBuffer();
-    inQuote = false;
-    while (parseCharacterAffix(affix) && pattern.moveNext());
-    return affix.toString();
-  }
-
-  /**
-   * Parse an individual character as part of a prefix or suffix.  Return true
-   * if we should continue to look for more affix characters, and false if
-   * we have reached the end.
-   */
-  bool parseCharacterAffix(StringBuffer affix) {
-    var ch = pattern.current;
-    if (ch == null) return false;
-    if (ch == _QUOTE) {
-      if (pattern.peek == _QUOTE) {
-        pattern.moveNext();
-        affix.write(_QUOTE); // 'don''t'
-      } else {
-        inQuote = !inQuote;
-      }
-      return true;
-    }
-
-    if (inQuote) {
-      affix.write(ch);
-    } else {
-      switch (ch) {
-        case _PATTERN_DIGIT:
-        case _PATTERN_ZERO_DIGIT:
-        case _PATTERN_GROUPING_SEPARATOR:
-        case _PATTERN_DECIMAL_SEPARATOR:
-        case _PATTERN_SEPARATOR:
-          return false;
-        case _PATTERN_CURRENCY_SIGN:
-          // TODO(alanknight): Handle the local/global/portable currency signs
-          affix.write(currencyName);
-          break;
-        case _PATTERN_PERCENT:
-          if (format._multiplier != 1 && format._multiplier != _PERCENT_SCALE) {
-            throw new FormatException('Too many percent/permill');
-          }
-          format._multiplier = _PERCENT_SCALE;
-          affix.write(symbols.PERCENT);
-          break;
-        case _PATTERN_PER_MILLE:
-          if (format._multiplier != 1 &&
-              format._multiplier != _PER_MILLE_SCALE) {
-            throw new FormatException('Too many percent/permill');
-          }
-          format._multiplier = _PER_MILLE_SCALE;
-          affix.write(symbols.PERMILL);
-          break;
-        default:
-          affix.write(ch);
-      }
-    }
-    return true;
-  }
-
-  /** Variables used in [_parseTrunk] and [parseTrunkCharacter]. */
-  var decimalPos = -1;
-  var digitLeftCount = 0;
-  var zeroDigitCount = 0;
-  var digitRightCount = 0;
-  var groupingCount = -1;
-
-  /**
-   * Parse the "trunk" portion of the pattern, the piece that doesn't include
-   * positive or negative prefixes or suffixes.
-   */
-  String _parseTrunk() {
-    var loop = true;
-    var trunk = new StringBuffer();
-    while (pattern.current != null && loop) {
-      loop = parseTrunkCharacter(trunk);
-    }
-
-    if (zeroDigitCount == 0 && digitLeftCount > 0 && decimalPos >= 0) {
-      // Handle '###.###' and '###.' and '.###'
-      // Handle '.###'
-      var n = decimalPos == 0 ? 1 : decimalPos;
-      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 new FormatException('Malformed pattern "${pattern.input}"');
-    }
-    var totalDigits = digitLeftCount + zeroDigitCount + digitRightCount;
-
-    format.maximumFractionDigits =
-        decimalPos >= 0 ? totalDigits - decimalPos : 0;
-    if (decimalPos >= 0) {
-      format.minimumFractionDigits =
-          digitLeftCount + zeroDigitCount - decimalPos;
-      if (format.minimumFractionDigits < 0) {
-        format.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;
-    format.minimumIntegerDigits = effectiveDecimalPos - digitLeftCount;
-    if (format._useExponentialNotation) {
-      format.maximumIntegerDigits =
-          digitLeftCount + format.minimumIntegerDigits;
-
-      // In exponential display, we need to at least show something.
-      if (format.maximumFractionDigits == 0 &&
-          format.minimumIntegerDigits == 0) {
-        format.minimumIntegerDigits = 1;
-      }
-    }
-
-    format._finalGroupingSize = max(0, groupingCount);
-    if (!format._groupingSizeSetExplicitly) {
-      format._groupingSize = format._finalGroupingSize;
-    }
-    format._decimalSeparatorAlwaysShown =
-        decimalPos == 0 || decimalPos == totalDigits;
-
-    return trunk.toString();
-  }
-
-  /**
-   * Parse an individual character of the trunk. Return true if we should
-   * continue to look for additional trunk characters or false if we have
-   * reached the end.
-   */
-  bool parseTrunkCharacter(trunk) {
-    var ch = pattern.current;
-    switch (ch) {
-      case _PATTERN_DIGIT:
-        if (zeroDigitCount > 0) {
-          digitRightCount++;
-        } else {
-          digitLeftCount++;
-        }
-        if (groupingCount >= 0 && decimalPos < 0) {
-          groupingCount++;
-        }
-        break;
-      case _PATTERN_ZERO_DIGIT:
-        if (digitRightCount > 0) {
-          throw new FormatException(
-              'Unexpected "0" in pattern "' + pattern.input + '"');
-        }
-        zeroDigitCount++;
-        if (groupingCount >= 0 && decimalPos < 0) {
-          groupingCount++;
-        }
-        break;
-      case _PATTERN_GROUPING_SEPARATOR:
-        if (groupingCount > 0) {
-          format._groupingSizeSetExplicitly = true;
-          format._groupingSize = groupingCount;
-        }
-        groupingCount = 0;
-        break;
-      case _PATTERN_DECIMAL_SEPARATOR:
-        if (decimalPos >= 0) {
-          throw new FormatException(
-              'Multiple decimal separators in pattern "$pattern"');
-        }
-        decimalPos = digitLeftCount + zeroDigitCount + digitRightCount;
-        break;
-      case _PATTERN_EXPONENT:
-        trunk.write(ch);
-        if (format._useExponentialNotation) {
-          throw new FormatException(
-              'Multiple exponential symbols in pattern "$pattern"');
-        }
-        format._useExponentialNotation = true;
-        format.minimumExponentDigits = 0;
-
-        // exponent pattern can have a optional '+'.
-        pattern.moveNext();
-        var nextChar = pattern.current;
-        if (nextChar == _PATTERN_PLUS) {
-          trunk.write(pattern.current);
-          pattern.moveNext();
-          format._useSignForPositiveExponent = true;
-        }
-
-        // Use lookahead to parse out the exponential part
-        // of the pattern, then jump into phase 2.
-        while (pattern.current == _PATTERN_ZERO_DIGIT) {
-          trunk.write(pattern.current);
-          pattern.moveNext();
-          format.minimumExponentDigits++;
-        }
-
-        if ((digitLeftCount + zeroDigitCount) < 1 ||
-            format.minimumExponentDigits < 1) {
-          throw new FormatException('Malformed exponential pattern "$pattern"');
-        }
-        return false;
-      default:
-        return false;
-    }
-    trunk.write(ch);
-    pattern.moveNext();
-    return true;
-  }
-}
-
-/**
- * Returns an [Iterable] on the string as a list of substrings.
- */
-Iterable _iterable(String s) => new _StringIterable(s);
-
-/**
- * Return an iterator on the string as a list of substrings.
- */
-Iterator _iterator(String s) => new _StringIterator(s);
-
-// TODO(nweiz): remove this when issue 3780 is fixed.
-/**
- * Provides an Iterable that wraps [_iterator] so it can be used in a `for`
- * loop.
- */
-class _StringIterable extends IterableBase<String> {
-  final Iterator<String> iterator;
-
-  _StringIterable(String s) : iterator = _iterator(s);
-}
-
-/**
- * Provides an iterator over a string as a list of substrings, and also
- * gives us a lookahead of one via the [peek] method.
- */
-class _StringIterator implements Iterator<String> {
-  final String input;
-  int nextIndex = 0;
-  String _current = null;
-
-  _StringIterator(input) : input = _validate(input);
-
-  String get current => _current;
-
-  bool moveNext() {
-    if (nextIndex >= input.length) {
-      _current = null;
-      return false;
-    }
-    _current = input[nextIndex++];
-    return true;
-  }
-
-  String get peek => nextIndex >= input.length ? null : input[nextIndex];
-
-  Iterator<String> get iterator => this;
-
-  static String _validate(input) {
-    if (input is! String) throw new ArgumentError(input);
-    return input;
-  }
-}