/src/Symfony/Component/Locale/Stub/StubNumberFormatter.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Locale\Stub;

use Symfony\Component\Locale\Stub\StubLocale;
use Symfony\Component\Locale\Exception\NotImplementedException;
use Symfony\Component\Locale\Exception\MethodNotImplementedException;
use Symfony\Component\Locale\Exception\MethodArgumentNotImplementedException;
use Symfony\Component\Locale\Exception\MethodArgumentValueNotImplementedException;

/**
 * Provides a stub NumberFormatter for the 'en' locale.
 *
 * @author Eriksen Costa <eriksen.costa@infranology.com.br>
 */
class StubNumberFormatter
{
    /**
     * Constants defined by the intl extension, not class constants in NumberFormatter
     * TODO: remove if the Form component drop the call to the intl_is_failure() function
     *
     * @see StubNumberFormatter::getErrorCode()
     * @see StubNumberFormatter::getErrorMessage()
     */
    const U_ZERO_ERROR = 0;
    const U_PARSE_ERROR = 9;

    /**
     * The error messages for each error code
     *
     * @var array
     */
    protected $errorMessages = array(
        self::U_ZERO_ERROR => 'U_ZERO_ERROR',
        self::U_PARSE_ERROR => 'Number parsing failed: U_PARSE_ERROR',
    );

    /**
     * The error code from the last operation
     *
     * @var integer
     */
    protected $errorCode = self::U_ZERO_ERROR;

    /** Format style constants */
    const PATTERN_DECIMAL   = 0;
    const DECIMAL           = 1;
    const CURRENCY          = 2;
    const PERCENT           = 3;
    const SCIENTIFIC        = 4;
    const SPELLOUT          = 5;
    const ORDINAL           = 6;
    const DURATION          = 7;
    const PATTERN_RULEBASED = 9;
    const IGNORE            = 0;
    const DEFAULT_STYLE     = 1;

    /** Format type constants */
    const TYPE_DEFAULT  = 0;
    const TYPE_INT32    = 1;
    const TYPE_INT64    = 2;
    const TYPE_DOUBLE   = 3;
    const TYPE_CURRENCY = 4;

    /** Numeric attribute constants */
    const PARSE_INT_ONLY          = 0;
    const GROUPING_USED           = 1;
    const DECIMAL_ALWAYS_SHOWN    = 2;
    const MAX_INTEGER_DIGITS      = 3;
    const MIN_INTEGER_DIGITS      = 4;
    const INTEGER_DIGITS          = 5;
    const MAX_FRACTION_DIGITS     = 6;
    const MIN_FRACTION_DIGITS     = 7;
    const FRACTION_DIGITS         = 8;
    const MULTIPLIER              = 9;
    const GROUPING_SIZE           = 10;
    const ROUNDING_MODE           = 11;
    const ROUNDING_INCREMENT      = 12;
    const FORMAT_WIDTH            = 13;
    const PADDING_POSITION        = 14;
    const SECONDARY_GROUPING_SIZE = 15;
    const SIGNIFICANT_DIGITS_USED = 16;
    const MIN_SIGNIFICANT_DIGITS  = 17;
    const MAX_SIGNIFICANT_DIGITS  = 18;
    const LENIENT_PARSE           = 19;

    /** Text attribute constants */
    const POSITIVE_PREFIX   = 0;
    const POSITIVE_SUFFIX   = 1;
    const NEGATIVE_PREFIX   = 2;
    const NEGATIVE_SUFFIX   = 3;
    const PADDING_CHARACTER = 4;
    const CURRENCY_CODE     = 5;
    const DEFAULT_RULESET   = 6;
    const PUBLIC_RULESETS   = 7;

    /** Format symbol constants */
    const DECIMAL_SEPARATOR_SYMBOL           = 0;
    const GROUPING_SEPARATOR_SYMBOL          = 1;
    const PATTERN_SEPARATOR_SYMBOL           = 2;
    const PERCENT_SYMBOL                     = 3;
    const ZERO_DIGIT_SYMBOL                  = 4;
    const DIGIT_SYMBOL                       = 5;
    const MINUS_SIGN_SYMBOL                  = 6;
    const PLUS_SIGN_SYMBOL                   = 7;
    const CURRENCY_SYMBOL                    = 8;
    const INTL_CURRENCY_SYMBOL               = 9;
    const MONETARY_SEPARATOR_SYMBOL          = 10;
    const EXPONENTIAL_SYMBOL                 = 11;
    const PERMILL_SYMBOL                     = 12;
    const PAD_ESCAPE_SYMBOL                  = 13;
    const INFINITY_SYMBOL                    = 14;
    const NAN_SYMBOL                         = 15;
    const SIGNIFICANT_DIGIT_SYMBOL           = 16;
    const MONETARY_GROUPING_SEPARATOR_SYMBOL = 17;

    /** Rounding mode values used by NumberFormatter::setAttribute() with NumberFormatter::ROUNDING_MODE attribute */
    const ROUND_CEILING  = 0;
    const ROUND_FLOOR    = 1;
    const ROUND_DOWN     = 2;
    const ROUND_UP       = 3;
    const ROUND_HALFEVEN = 4;
    const ROUND_HALFDOWN = 5;
    const ROUND_HALFUP   = 6;

    /** Pad position values used by NumberFormatter::setAttribute() with NumberFormatter::PADDING_POSITION attribute */
    const PAD_BEFORE_PREFIX = 0;
    const PAD_AFTER_PREFIX  = 1;
    const PAD_BEFORE_SUFFIX = 2;
    const PAD_AFTER_SUFFIX  = 3;

    /**
     * Default values for the en locale
     *
     * @var array
     */
    private $attributes = array(
        self::FRACTION_DIGITS => 0,
        self::GROUPING_USED   => 1,
        self::ROUNDING_MODE   => self::ROUND_HALFEVEN
    );

    /**
     * Holds the initialized attributes code
     *
     * @var array
     */
    private $initializedAttributes = array();

    /**
     * The supported styles to the constructor $styles argument
     *
     * @var array
     */
    static private $supportedStyles = array(
        'CURRENCY' => self::CURRENCY,
        'DECIMAL'  => self::DECIMAL
    );

    /**
     * Supported attributes to the setAttribute() $attr argument
     *
     * @var array
     */
    static private $supportedAttributes = array(
        'FRACTION_DIGITS' => self::FRACTION_DIGITS,
        'GROUPING_USED'   => self::GROUPING_USED,
        'ROUNDING_MODE'   => self::ROUNDING_MODE
    );

    /**
     * The available rounding modes for setAttribute() usage with
     * StubNumberFormatter::ROUNDING_MODE. StubNumberFormatter::ROUND_DOWN
     * and StubNumberFormatter::ROUND_UP does not have a PHP only equivalent
     *
     * @var array
     */
    static private $roundingModes = array(
        'ROUND_HALFEVEN' => self::ROUND_HALFEVEN,
        'ROUND_HALFDOWN' => self::ROUND_HALFDOWN,
        'ROUND_HALFUP'   => self::ROUND_HALFUP
    );

    /**
     * The mapping between NumberFormatter rounding modes to the available
     * modes in PHP's round() function.
     *
     * @see http://www.php.net/manual/en/function.round.php
     *
     * @var array
     */
    static private $phpRoundingMap = array(
        self::ROUND_HALFDOWN => \PHP_ROUND_HALF_DOWN,
        self::ROUND_HALFEVEN => \PHP_ROUND_HALF_EVEN,
        self::ROUND_HALFUP   => \PHP_ROUND_HALF_UP
    );

    /**
     * The maximum values of the integer type in 32 bit platforms.
     *
     * @var array
     */
    static private $int32Range = array(
        'positive' => 2147483647,
        'negative' => -2147483648
    );

    /**
     * The maximum values of the integer type in 64 bit platforms.
     *
     * @var array
     */
    static private $int64Range = array(
        'positive' => 9223372036854775807,
        'negative' => -9223372036854775808
    );

    /**
     * @var string
     */
    private $locale = null;

    /**
     * @var int
     */
    private $style = null;

    /**
     * Constructor
     *
     * @param  string  $locale   The locale code
     * @param  int     $style    Style of the formatting, one of the format style constants
     * @param  string  $pattern  A pattern string in case $style is NumberFormat::PATTERN_DECIMAL or
     *                           NumberFormat::PATTERN_RULEBASED. It must conform to  the syntax
     *                           described in the ICU DecimalFormat or ICU RuleBasedNumberFormat documentation
     *
     * @see    http://www.php.net/manual/en/numberformatter.create.php
     * @see    http://www.icu-project.org/apiref/icu4c/classDecimalFormat.html#_details
     * @see    http://www.icu-project.org/apiref/icu4c/classRuleBasedNumberFormat.html#_details
     *
     * @throws MethodArgumentValueNotImplementedException  When $locale different than 'en' is passed
     * @throws MethodArgumentValueNotImplementedException  When the $style is not supported
     * @throws MethodArgumentNotImplementedException       When the pattern value is different than null
     */
    public function __construct($locale = 'en', $style = null, $pattern = null)
    {
        if ('en' != $locale) {
            throw new MethodArgumentValueNotImplementedException(__METHOD__, 'locale', $locale, 'Only the \'en\' locale is supported');
        }

        if (!in_array($style, self::$supportedStyles)) {
            $message = sprintf('The available styles are: %s.', implode(', ', array_keys(self::$supportedStyles)));
            throw new MethodArgumentValueNotImplementedException(__METHOD__, 'style', $style, $message);
        }

        if (null !== $pattern) {
            throw new MethodArgumentNotImplementedException(__METHOD__, 'pattern');
        }

        $this->locale = $locale;
        $this->style  = $style;
    }

    /**
     * Static constructor
     *
     * @param  string  $locale   The locale code
     * @param  int     $style    Style of the formatting, one of the format style constants
     * @param  string  $pattern  A pattern string in case $style is NumberFormat::PATTERN_DECIMAL or
     *                           NumberFormat::PATTERN_RULEBASED. It must conform to  the syntax
     *                           described in the ICU DecimalFormat or ICU RuleBasedNumberFormat documentation
     *
     * @see    http://www.php.net/manual/en/numberformatter.create.php
     * @see    http://www.icu-project.org/apiref/icu4c/classDecimalFormat.html#_details
     * @see    http://www.icu-project.org/apiref/icu4c/classRuleBasedNumberFormat.html#_details
     *
     * @throws MethodArgumentValueNotImplementedException  When $locale different than 'en' is passed
     * @throws MethodArgumentValueNotImplementedException  When the $style is not supported
     * @throws MethodArgumentNotImplementedException       When the pattern value is different than null
     */
    static public function create($locale = 'en', $style = null, $pattern = null)
    {
        return new self($locale, $style, $pattern);
    }

    /**
     * Format a currency value
     *
     * @param  float   $value     The numeric currency value
     * @param  string  $currency  The 3-letter ISO 4217 currency code indicating the currency to use
     *
     * @return string             The formatted currency value
     *
     * @see    http://www.php.net/manual/en/numberformatter.formatcurrency.php
     * @see    http://www.iso.org/iso/support/faqs/faqs_widely_used_standards/widely_used_standards_other/currency_codes/currency_codes_list-1.htm
     */
    public function formatCurrency($value, $currency)
    {
        if ($this->style == self::DECIMAL) {
            return $this->format($value);
        }

        $symbol = $this->getCurrencySymbol($currency);
        $fractionDigits = $this->getCurrencyFractionDigits($currency);

        $value = $this->roundCurrency($value, $currency);

        $negative = false;
        if (0 > $value) {
            $negative = true;
            $value *= -1;
        }

        $value = $this->formatNumber($value, $fractionDigits);

        $ret = $symbol.$value;

        return $negative ? '('.$ret.')' : $ret;
    }

    /**
     * Format a number
     *
     * @param  number      $value                     The value to format
     * @param  int         $type                      Type of the formatting, one of the format type constants
     *
     * @return Boolean|string                         The formatted value or false on error
     *
     * @see    http://www.php.net/manual/en/numberformatter.format.php
     *
     * @throws RuntimeException                       If the method is called with the class $style 'CURRENCY'
     * @throws MethodArgumentNotImplementedException  If the $type is different than TYPE_DEFAULT
     */
    public function format($value, $type = self::TYPE_DEFAULT)
    {
        // The original NumberFormatter does not support this format type
        if ($type == self::TYPE_CURRENCY) {
            trigger_error(__METHOD__.'(): Unsupported format type '.$type, \E_USER_WARNING);

            return false;
        }

        if ($this->style == self::CURRENCY) {
            throw new \RuntimeException(sprintf(
                '%s() method does not support the formatting of currencies (instance with CURRENCY style). %s',
                __METHOD__, NotImplementedException::INTL_INSTALL_MESSAGE
            ));
        }

        // Only the default type is supported.
        if ($type != self::TYPE_DEFAULT) {
            throw new MethodArgumentValueNotImplementedException(__METHOD__, 'type', $type, 'Only TYPE_DEFAULT is supported');
        }

        $fractionDigits = $this->getAttribute(self::FRACTION_DIGITS);

        $value = $this->round($value, $fractionDigits);

        return $this->formatNumber($value, $fractionDigits);
    }

    /**
     * Returns an attribute value
     *
     * @param  int       $attr   An attribute specifier, one of the numeric attribute constants
     *
     * @return Boolean|int       The attribute value on success or false on error
     *
     * @see    http://www.php.net/manual/en/numberformatter.getattribute.php
     */
    public function getAttribute($attr)
    {
        return isset($this->attributes[$attr]) ? $this->attributes[$attr] : null;
    }

    /**
     * Returns formatter's last error code. Always returns the U_ZERO_ERROR class constant value
     *
     * @return int  The error code from last formatter call
     *
     * @see    http://www.php.net/manual/en/numberformatter.geterrorcode.php
     */
    public function getErrorCode()
    {
        return $this->errorCode;
    }

    /**
     * Returns formatter's last error message. Always returns the U_ZERO_ERROR_MESSAGE class constant value
     *
     * @return string  The error message from last formatter call
     *
     * @see    http://www.php.net/manual/en/numberformatter.geterrormessage.php
     */
    public function getErrorMessage()
    {
        return $this->errorMessages[$this->errorCode];
    }

    /**
     * Returns the formatter's locale
     *
     * @param  int      $type     The locale name type to return between valid or actual (StubLocale::VALID_LOCALE or StubLocale::ACTUAL_LOCALE, respectively)
     *
     * @return string             The locale name used to create the formatter
     *
     * @see    http://www.php.net/manual/en/numberformatter.getlocale.php
     */
    public function getLocale($type = StubLocale::ACTUAL_LOCALE)
    {
        return $this->locale;
    }

    /**
     * Returns the formatter's pattern
     *
     * @return Boolean|string     The pattern string used by the formatter or false on error
     *
     * @see    http://www.php.net/manual/en/numberformatter.getpattern.php
     *
     * @throws MethodNotImplementedException
     */
    public function getPattern()
    {
        throw new MethodNotImplementedException(__METHOD__);
    }

    /**
     * Returns a formatter symbol value
     *
     * @param  int           $attr   A symbol specifier, one of the format symbol constants
     *
     * @return Boolean|string        The symbol value or false on error
     *
     * @see    http://www.php.net/manual/en/numberformatter.getsymbol.php
     *
     * @throws MethodNotImplementedException
     */
    public function getSymbol($attr)
    {
        throw new MethodNotImplementedException(__METHOD__);
    }

    /**
     * Returns a formatter text attribute value
     *
     * @param  int           $attr   An attribute specifier, one of the text attribute constants
     *
     * @return Boolean|string        The attribute value or false on error
     *
     * @see    http://www.php.net/manual/en/numberformatter.gettextattribute.php
     *
     * @throws MethodNotImplementedException
     */
    public function getTextAttribute($attr)
    {
        throw new MethodNotImplementedException(__METHOD__);
    }

    /**
     * Parse a currency number
     *
     * @param  string       $value      The value to parse
     * @param  string       $currency   Parameter to receive the currency name (reference)
     * @param  int          $position   Offset to begin the parsing on return this value will hold the offset at which the parsing ended
     *
     * @return Boolean|string           The parsed numeric value of false on error
     *
     * @see    http://www.php.net/manual/en/numberformatter.parsecurrency.php
     *
     * @throws MethodNotImplementedException
     */
    public function parseCurrency($value, &$currency, &$position = null)
    {
        throw new MethodNotImplementedException(__METHOD__);
    }

    /**
     * Parse a number
     *
     * @param  string       $value                          The value to parse
     * @param  string       $type                           Type of the formatting, one of the format type constants. NumberFormatter::TYPE_DOUBLE by default
     * @param  int          $position                       Offset to begin the parsing on return this value will hold the offset at which the parsing ended
     *
     * @return Boolean|string                               The parsed value of false on error
     *
     * @see    http://www.php.net/manual/en/numberformatter.parse.php
     *
     * @throws MethodArgumentNotImplementedException        When $position different than null, behavior not implemented
     */
    public function parse($value, $type = self::TYPE_DOUBLE, &$position = null)
    {
        if ($type == self::TYPE_DEFAULT || $type == self::TYPE_CURRENCY) {
            trigger_error(__METHOD__.'(): Unsupported format type '.$type, \E_USER_WARNING);

            return false;
        }

        // We don't calculate the position when parsing the value
        if (null !== $position) {
            throw new MethodArgumentNotImplementedException(__METHOD__, 'position');
        }

        preg_match('/^([^0-9\-]{0,})(.*)/', $value, $matches);

        // Any string before the numeric value causes error in the parsing
        if (isset($matches[1]) && !empty($matches[1])) {
            $this->errorCode = self::U_PARSE_ERROR;

            return false;
        }

        // Remove everything that is not number or dot (.)
        $value = preg_replace('/[^0-9\.\-]/', '', $value);

        return $this->convertValueDataType($value, $type);
    }

    /**
     * Set an attribute
     *
     * @param  int   $attr                                 An attribute specifier, one of the numeric attribute constants
     * @param  int   $value                                The attribute value
     *
     * @return Boolean                                     true on success or false on failure
     *
     * @see    http://www.php.net/manual/en/numberformatter.setattribute.php
     *
     * @throws MethodArgumentValueNotImplementedException  When the $attr is not supported
     * @throws MethodArgumentValueNotImplementedException  When the $value is not supported
     */
    public function setAttribute($attr, $value)
    {
        if (!in_array($attr, self::$supportedAttributes)) {
            $message = sprintf(
                'The available attributes are: %s',
                implode(', ', array_keys(self::$supportedAttributes))
            );

            throw new MethodArgumentValueNotImplementedException(__METHOD__, 'attr', $value, $message);
        }

        if (self::$supportedAttributes['ROUNDING_MODE'] == $attr && $this->isInvalidRoundingMode($value)) {
            $message = sprintf(
                'The supported values for ROUNDING_MODE are: %s',
                implode(', ', array_keys(self::$roundingModes))
            );

            throw new MethodArgumentValueNotImplementedException(__METHOD__, 'attr', $value, $message);
        }

        if (self::$supportedAttributes['GROUPING_USED'] == $attr) {
            $value = $this->normalizeGroupingUsedValue($value);
        }

        if (self::$supportedAttributes['FRACTION_DIGITS'] == $attr) {
            $value = $this->normalizeFractionDigitsValue($value);
        }

        $this->attributes[$attr] = $value;
        $this->initializedAttributes[$attr] = true;

        return true;
    }

    /**
     * Set the formatter's pattern
     *
     * @param  string  $pattern   A pattern string in conformance with the ICU DecimalFormat documentation
     *
     * @return Boolean            true on success or false on failure
     *
     * @see    http://www.php.net/manual/en/numberformatter.setpattern.php
     * @see    http://www.icu-project.org/apiref/icu4c/classDecimalFormat.html#_details
     *
     * @throws MethodNotImplementedException
     */
    public function setPattern($pattern)
    {
        throw new MethodNotImplementedException(__METHOD__);
    }

    /**
     * Set the formatter's symbol
     *
     * @param  int      $attr    A symbol specifier, one of the format symbol constants
     * @param  string   $value   The value for the symbol
     *
     * @return Boolean           true on success or false on failure
     *
     * @see    http://www.php.net/manual/en/numberformatter.setsymbol.php
     *
     * @throws MethodNotImplementedException
     */
    public function setSymbol($attr, $value)
    {
        throw new MethodNotImplementedException(__METHOD__);
    }

    /**
     * Set a text attribute
     *
     * @param  int   $attr       An attribute specifier, one of the text attribute constants
     * @param  int   $value      The attribute value
     *
     * @return Boolean           true on success or false on failure
     *
     * @see    http://www.php.net/manual/en/numberformatter.settextattribute.php
     *
     * @throws MethodNotImplementedException
     */
    public function setTextAttribute($attr, $value)
    {
        throw new MethodNotImplementedException(__METHOD__);
    }

    /**
     * Rounds a currency value, applying increment rounding if applicable
     *
     * When a currency have a rounding increment, an extra round is made after the first one. The rounding factor is
     * determined in the ICU data and is explained as of:
     *
     * "the rounding increment is given in units of 10^(-fraction_digits)"
     *
     * The only actual rounding data as of this writing, is CHF.
     *
     * @param  float   $value     The numeric currency value
     * @param  string  $currency  The 3-letter ISO 4217 currency code indicating the currency to use
     *
     * @return string             The rounded numeric currency value
     *
     * @see    http://en.wikipedia.org/wiki/Swedish_rounding
     * @see    http://www.docjar.com/html/api/com/ibm/icu/util/Currency.java.html#1007
     */
    private function roundCurrency($value, $currency)
    {
        $fractionDigits = $this->getCurrencyFractionDigits($currency);
        $roundingIncrement = $this->getCurrencyRoundingIncrement($currency);

        // Round with the formatter rounding mode
        $value = $this->round($value, $fractionDigits);

        // Swiss rounding
        if (0 < $roundingIncrement && 0 < $fractionDigits) {
            $roundingFactor = $roundingIncrement / pow(10, $fractionDigits);
            $value = round($value / $roundingFactor) * $roundingFactor;
        }

        return $value;
    }

    /**
     * Returns the currency symbol
     *
     * @param  string   $currency   The 3-letter ISO 4217 currency code indicating the currency to use
     *
     * @return string               The currency symbol
     */
    private function getCurrencySymbol($currency)
    {
        $currencies = StubLocale::getCurrenciesData($this->locale);

        return $currencies[$currency]['symbol'];
    }

    /**
     * Returns the fraction digits of a currency
     *
     * @param  string   $currency   The 3-letter ISO 4217 currency code indicating the currency to use
     *
     * @return string               The fraction digits of a currency
     */
    private function getCurrencyFractionDigits($currency)
    {
        $currencies = StubLocale::getCurrenciesData($this->locale);

        return $currencies[$currency]['fractionDigits'];
    }

    /**
     * Returns the rounding increment of a currency
     *
     * @param  string   $currency   The 3-letter ISO 4217 currency code indicating the currency to use
     *
     * @return string               The rounding increment of a currency
     */
    private function getCurrencyRoundingIncrement($currency)
    {
        $currencies = StubLocale::getCurrenciesData($this->locale);

        return $currencies[$currency]['roundingIncrement'];
    }

    /**
     * Rounds a value.
     *
     * @param  numeric   $value      The value to round
     * @param  int       $precision  The number of decimal digits to round to
     *
     * @return numeric               The rounded value
     */
    private function round($value, $precision)
    {
        $precision = $this->getUnitializedPrecision($value, $precision);

        $roundingMode = self::$phpRoundingMap[$this->getAttribute(self::ROUNDING_MODE)];
        $value = round($value, $precision, $roundingMode);

        return $value;
    }

    /**
     * Formats a number.
     *
     * @param  numeric   $value      The numeric value to format
     * @param  int       $precision  The number of decimal digits to use
     *
     * @return string                The formatted number
     */
    private function formatNumber($value, $precision)
    {
        $precision = $this->getUnitializedPrecision($value, $precision);

        return number_format($value, $precision, '.', $this->getAttribute(self::GROUPING_USED) ? ',' : '');
    }

    /**
     * Returns the precision value if the the DECIMAL style is being used and the FRACTION_DIGITS attribute is unitialized.
     *
     * @param  numeric  $value      The value to get the precision from if the FRACTION_DIGITS attribute is unitialized
     * @param  int      $precision  The precision value to returns if the FRACTION_DIGITS attribute is initialized
     *
     * @return int                  The precision value
     */
    private function getUnitializedPrecision($value, $precision)
    {
        if ($this->style == self::CURRENCY) {
            return $precision;
        }

        if (!$this->isInitializedAttribute(self::FRACTION_DIGITS)) {
            preg_match('/.*\.(.*)/', (string) $value, $digits);
            if (isset($digits[1])) {
                $precision = strlen($digits[1]);
            }
        }

        return $precision;
    }

    /**
     * Check if the attribute is initialized (value set by client code).
     *
     * @param  string  $attr   The attribute name
     *
     * @return Boolean         true if the value was set by client, false otherwise
     */
    private function isInitializedAttribute($attr)
    {
        return isset($this->initializedAttributes[$attr]);
    }

    /**
     * Returns the numeric value using the $type to convert to the right data type.
     *
     * @param  mixed    $value   The value to be converted
     * @param  int      $type    The type to convert. Can be TYPE_DOUBLE (float) or TYPE_INT32 (int)
     *
     * @return numeric           The converted value
     */
    private function convertValueDataType($value, $type)
    {
        if ($type == self::TYPE_DOUBLE) {
            $value = (float) $value;
        } elseif ($type == self::TYPE_INT32) {
            $value = $this->getInt32Value($value);
        } elseif ($type == self::TYPE_INT64) {
            $value = $this->getInt64Value($value);
        }

        return $value;
    }

    /**
     * Convert the value data type to int or returns false if the value is out of the integer value range.
     *
     * @param  mixed  $value   The value to be converted
     *
     * @return int             The converted value
     */
    private function getInt32Value($value)
    {
        if ($value > self::$int32Range['positive'] || $value < self::$int32Range['negative']) {
            return false;
        }

        return (int) $value;
    }

    /**
     * Convert the value data type to int or returns false if the value is out of the integer value range.
     *
     * @param  mixed  $value   The value to be converted
     *
     * @return int|float       The converted value
     */
    private function getInt64Value($value)
    {
        if ($value > self::$int64Range['positive'] || $value < self::$int64Range['negative']) {
            return false;
        }

        if (PHP_INT_SIZE !== 8 && ($value > self::$int32Range['positive'] || $value <= self::$int32Range['negative'])) {
            return (float) $value;
        }

        if (PHP_INT_SIZE === 8 && ($value > self::$int32Range['positive'] || $value < self::$int32Range['negative'])) {
            $value = (-2147483648 - ($value % -2147483648)) * ($value / abs($value));
        }

        return (int) $value;
    }

    /**
     * Check if the rounding mode is invalid.
     *
     * @param  int    $value  The rounding mode value to check
     *
     * @return Boolean        true if the rounding mode is invalid, false otherwise
     */
    private function isInvalidRoundingMode($value)
    {
        if (in_array($value, self::$roundingModes, true)) {
            return false;
        }

        return true;
    }

    /**
     * Returns the normalized value for the GROUPING_USED attribute. Any value that can be converted to int will be
     * cast to Boolean and then to int again. This way, negative values are converted to 1 and string values to 0.
     *
     * @param  mixed  $value   The value to be normalized
     *
     * @return int             The normalized value for the attribute (0 or 1)
     */
    private function normalizeGroupingUsedValue($value)
    {
        return (int) (Boolean) (int) $value;
    }

    /**
     * Returns the normalized value for the FRACTION_DIGITS attribute. The value is converted to int and if negative,
     * the returned value will be 0.
     *
     * @param  mixed  $value   The value to be normalized
     *
     * @return int             The normalized value for the attribute
     */
    private function normalizeFractionDigitsValue($value)
    {
        $value = (int) $value;

        return (0 > $value) ? 0 : $value;
    }
}