Agavi\Util\DecimalFormatter::getDecimalParseRegex()

Complexity

Conditions	15
Paths	86

Size

Total Lines	77
Code Lines	51

Duplication

Lines	0
Ratio	0 %

Importance

Changes

0

<?php
    protected static function getDecimalParseRegex(Locale $locale = null)
    {
        static $patternCache = array();
        
        if ($locale) {
            $localeId = $locale->getIdentifier();
        } else {
            $localeId = '';
        }
        
        if (isset($patternCache[$localeId])) {
            return $patternCache[$localeId];
        }
        
        if ($locale) {
            $decimalFormats = $locale->getDecimalFormats();
            $groupingSeparator = $locale->getNumberSymbolGroup();
            $decimalSeparator = $locale->getNumberSymbolDecimal();
            $minusSign = $locale->getNumberSymbolMinusSign();
        } else {
            $decimalFormats = array('#,##0.###');
            $groupingSeparator = ',';
            $decimalSeparator = '.';
            $minusSign = '-';
        }
        
        $patterns = array();
        
        foreach ($decimalFormats as $decimalFormatList) {
            $decimalFormatList = explode(';', $decimalFormatList, 2);
            if (count($decimalFormatList) == 1) {
                // no pattern for negative numbers
                // we need a copy of the format with a minus prefix
                $decimalFormatList[1] = '-' . $decimalFormatList[0];
            }
            foreach (array(true, false) as $withFraction) :
                foreach ($decimalFormatList as $decimalFormat) {
                    // we need to make three parts: number, decimal part and minus sign
                    $decimalFormatChunks = preg_split('/([\.\-])/', $decimalFormat, 0, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
                    // there is a minus sign at the beginning or end! find it!
                    $pastDecimalSeparator = false;
                    foreach ($decimalFormatChunks as &$decimalFormatChunk) {
                        if ($decimalFormatChunk == '-') {
                            // always allow "-" in addition to the minus sign supplied by the locale. we do this because some locales (e.g. da, fa, se, sv) have U+2212 (the "real" minus sign) defined in the locale data, but no human can really type that character on their keyboard. consider it lenient parsing ;) see ticket #1293
                            $decimalFormatChunk = '(?P<minus>' . preg_quote($minusSign, '#') . '|-)';
                        } elseif ($decimalFormatChunk == '.') {
                            $pastDecimalSeparator = true;
                            if ($withFraction) {
                                $decimalFormatChunk = preg_quote($decimalSeparator, '#');
                            } else {
                                $decimalFormatChunk = '';
                            }
                        } else {
                            $decimalFormatChunk = preg_replace('/[#0,]+/u', '[\d' . preg_quote($groupingSeparator, '#') . ']*', $decimalFormatChunk);
                            if (!$pastDecimalSeparator) {
                                if ($withFraction) {
                                    $decimalFormatChunk = '(?P<num>(?=[\d,]*\d)' . $decimalFormatChunk . '(\d|' . $decimalFormatChunk . '(?=\.[\d,]*\d)))?';
                                } else {
                                    $decimalFormatChunk = '(?P<num>(?=[\d,]*\d)' . $decimalFormatChunk . '\d)';
                                }
                            } else {
                                if ($withFraction) {
                                    $decimalFormatChunk = '(?P<dec>' . $decimalFormatChunk . '\d)?';
                                } else {
                                    $decimalFormatChunk = '';
                                }
                            }
                        }
                    }
                
                    $patterns[] = implode('', $decimalFormatChunks);
                }
            endforeach;
        }
        
        return $patternCache[$localeId] = '#(?J)^(' . implode('|', $patterns) . ')#u';
    }