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<?php |
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|
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namespace Gettext\Languages; |
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|
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use Exception; |
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|
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/** |
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* A helper class to convert a CLDR formula to a gettext formula. |
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*/ |
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class FormulaConverter |
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{ |
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/** |
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* Converts a formula from the CLDR representation to the gettext representation. |
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* |
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* @param string $cldrFormula the CLDR formula to convert |
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* |
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* @throws \Exception |
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* |
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* @return bool|string returns true if the gettext will always evaluate to true, false if gettext will always evaluate to false, return the gettext formula otherwise |
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*/ |
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public static function convertFormula($cldrFormula) |
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{ |
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if (strpbrk($cldrFormula, '()') !== false) { |
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throw new Exception("Unable to convert the formula '{$cldrFormula}': parenthesis handling not implemented"); |
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} |
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$orSeparatedChunks = array(); |
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foreach (explode(' or ', $cldrFormula) as $cldrFormulaChunk) { |
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$gettextFormulaChunk = null; |
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$andSeparatedChunks = array(); |
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foreach (explode(' and ', $cldrFormulaChunk) as $cldrAtom) { |
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$gettextAtom = self::convertAtom($cldrAtom); |
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if ($gettextAtom === false) { |
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// One atom joined by 'and' always evaluates to false => the whole 'and' group is always false |
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$gettextFormulaChunk = false; |
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break; |
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} |
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if ($gettextAtom !== true) { |
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$andSeparatedChunks[] = $gettextAtom; |
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} |
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} |
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if (!isset($gettextFormulaChunk)) { |
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if (empty($andSeparatedChunks)) { |
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// All the atoms joined by 'and' always evaluate to true => the whole 'and' group is always true |
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$gettextFormulaChunk = true; |
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} else { |
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$gettextFormulaChunk = implode(' && ', $andSeparatedChunks); |
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// Special cases simplification |
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switch ($gettextFormulaChunk) { |
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case 'n >= 0 && n <= 2 && n != 2': |
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$gettextFormulaChunk = 'n == 0 || n == 1'; |
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break; |
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} |
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} |
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} |
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if ($gettextFormulaChunk === true) { |
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// One part of the formula joined with the others by 'or' always evaluates to true => the whole formula always evaluates to true |
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return true; |
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} |
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if ($gettextFormulaChunk !== false) { |
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$orSeparatedChunks[] = $gettextFormulaChunk; |
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} |
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} |
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if (empty($orSeparatedChunks)) { |
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// All the parts joined by 'or' always evaluate to false => the whole formula always evaluates to false |
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return false; |
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} |
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|
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return implode(' || ', $orSeparatedChunks); |
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} |
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|
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/** |
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* Converts an atomic part of the CLDR formula to its gettext representation. |
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* |
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* @param string $cldrAtom the CLDR formula atom to convert |
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* |
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* @throws \Exception |
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* |
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* @return bool|string returns true if the gettext will always evaluate to true, false if gettext will always evaluate to false, return the gettext formula otherwise |
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*/ |
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private static function convertAtom($cldrAtom) |
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{ |
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$m = null; |
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$gettextAtom = $cldrAtom; |
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$gettextAtom = str_replace(' = ', ' == ', $gettextAtom); |
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$gettextAtom = str_replace('i', 'n', $gettextAtom); |
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if (preg_match('/^n( % \d+)? (!=|==) \d+$/', $gettextAtom)) { |
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return $gettextAtom; |
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} |
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if (preg_match('/^n( % \d+)? (!=|==) \d+(,\d+|\.\.\d+)+$/', $gettextAtom)) { |
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return self::expandAtom($gettextAtom); |
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} |
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if (preg_match('/^(?:v|w)(?: % 10+)? == (\d+)(?:\.\.\d+)?$/', $gettextAtom, $m)) { // For gettext: v == 0, w == 0 |
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return (int) $m[1] === 0 ? true : false; |
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} |
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if (preg_match('/^(?:v|w)(?: % 10+)? != (\d+)(?:\.\.\d+)?$/', $gettextAtom, $m)) { // For gettext: v == 0, w == 0 |
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return (int) $m[1] === 0 ? false : true; |
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} |
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if (preg_match('/^(?:f|t|c|e)(?: % 10+)? == (\d+)(?:\.\.\d+)?$/', $gettextAtom, $m)) { // f == empty, t == empty, c == empty, e == empty |
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return (int) $m[1] === 0 ? true : false; |
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} |
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if (preg_match('/^(?:f|t|c|e)(?: % 10+)? != (\d+)(?:\.\.\d+)?$/', $gettextAtom, $m)) { // f == empty, t == empty, c == empty, e == empty |
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return (int) $m[1] === 0 ? false : true; |
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} |
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throw new Exception("Unable to convert the formula chunk '{$cldrAtom}' from CLDR to gettext"); |
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} |
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|
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/** |
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* Expands an atom containing a range (for instance: 'n == 1,3..5'). |
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* |
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* @param string $atom |
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* |
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* @throws \Exception |
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* |
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* @return string |
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*/ |
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private static function expandAtom($atom) |
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{ |
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$m = null; |
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if (preg_match('/^(n(?: % \d+)?) (==|!=) (\d+(?:\.\.\d+|,\d+)+)$/', $atom, $m)) { |
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$what = $m[1]; |
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$op = $m[2]; |
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$chunks = array(); |
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foreach (explode(',', $m[3]) as $range) { |
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$chunk = null; |
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if ((!isset($chunk)) && preg_match('/^\d+$/', $range)) { |
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$chunk = "{$what} {$op} {$range}"; |
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} |
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if ((!isset($chunk)) && preg_match('/^(\d+)\.\.(\d+)$/', $range, $m)) { |
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$from = (int) $m[1]; |
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$to = (int) $m[2]; |
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if (($to - $from) === 1) { |
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switch ($op) { |
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case '==': |
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$chunk = "({$what} == {$from} || {$what} == {$to})"; |
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break; |
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case '!=': |
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$chunk = "{$what} != {$from} && {$what} == {$to}"; |
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break; |
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} |
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} else { |
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switch ($op) { |
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case '==': |
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$chunk = "{$what} >= {$from} && {$what} <= {$to}"; |
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break; |
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case '!=': |
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if ($what === 'n' && $from <= 0) { |
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$chunk = "{$what} > {$to}"; |
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} else { |
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$chunk = "({$what} < {$from} || {$what} > {$to})"; |
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} |
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break; |
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} |
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} |
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} |
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if (!isset($chunk)) { |
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throw new Exception("Unhandled range '{$range}' in '{$atom}'"); |
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} |
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$chunks[] = $chunk; |
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} |
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if (count($chunks) === 1) { |
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return $chunks[0]; |
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} |
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switch ($op) { |
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case '==': |
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return '(' . implode(' || ', $chunks) . ')'; break; |
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case '!=': |
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return implode(' && ', $chunks); |
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} |
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} |
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throw new Exception("Unable to expand '{$atom}'"); |
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} |
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} |
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|
