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- <?php
- /**
- * @file
- * Definition of Drupal\Component\Gettext\PoHeader.
- */
- /**
- * Gettext PO header handler.
- *
- * Possible Gettext PO header elements are explained in
- * http://www.gnu.org/software/gettext/manual/gettext.html#Header-Entry,
- * but we only support a subset of these directly.
- *
- * Example header:
- *
- * "Project-Id-Version: Drupal core (7.11)\n"
- * "POT-Creation-Date: 2012-02-12 22:59+0000\n"
- * "PO-Revision-Date: YYYY-mm-DD HH:MM+ZZZZ\n"
- * "Language-Team: Catalan\n"
- * "MIME-Version: 1.0\n"
- * "Content-Type: text/plain; charset=utf-8\n"
- * "Content-Transfer-Encoding: 8bit\n"
- * "Plural-Forms: nplurals=2; plural=(n>1);\n"
- */
- class PoHeader {
- /**
- * Language code.
- *
- * @var string
- */
- private $_langcode;
- /**
- * Formula for the plural form.
- *
- * @var string
- */
- private $_pluralForms;
- /**
- * Author(s) of the file.
- *
- * @var string
- */
- private $_authors;
- /**
- * Date the po file got created.
- *
- * @var string
- */
- private $_po_date;
- /**
- * Human readable language name.
- *
- * @var string
- */
- private $_languageName;
- /**
- * Name of the project the translation belongs to.
- *
- * @var string
- */
- private $_projectName;
- /**
- * Constructor, creates a PoHeader with default values.
- *
- * @param string $langcode
- * Language code.
- */
- public function __construct($langcode = NULL) {
- $this->_langcode = $langcode;
- // Ignore errors when run during site installation before
- // date_default_timezone_set() is called.
- $this->_po_date = @date("Y-m-d H:iO");
- $this->_pluralForms = 'nplurals=2; plural=(n > 1);';
- }
- /**
- * Get the plural form.
- *
- * @return string
- * Plural form component from the header, for example:
- * 'nplurals=2; plural=(n > 1);'.
- */
- public function getPluralForms() {
- return $this->_pluralForms;
- }
- /**
- * Set the human readable language name.
- *
- * @param string $languageName
- * Human readable language name.
- */
- public function setLanguageName($languageName) {
- $this->_languageName = $languageName;
- }
- /**
- * Get the human readable language name.
- *
- * @return string
- * The human readable language name.
- */
- public function getLanguageName() {
- return $this->_languageName;
- }
- /**
- * Set the project name.
- *
- * @param string $projectName
- * Human readable project name.
- */
- public function setProjectName($projectName) {
- $this->_projectName = $projectName;
- }
- /**
- * Get the project name.
- *
- * @return string
- * The human readable project name.
- */
- public function getProjectName() {
- return $this->_projectName;
- }
- /**
- * Populate internal values from a string.
- *
- * @param string $header
- * Full header string with key-value pairs.
- */
- public function setFromString($header) {
- // Get an array of all header values for processing.
- $values = $this->parseHeader($header);
- // There is only one value relevant for our header implementation when
- // reading, and that is the plural formula.
- if (!empty($values['Plural-Forms'])) {
- $this->_pluralForms = $values['Plural-Forms'];
- }
- }
- /**
- * Generate a Gettext PO formatted header string based on data set earlier.
- */
- public function __toString() {
- $output = '';
- $isTemplate = empty($this->_languageName);
- $output .= '# ' . ($isTemplate ? 'LANGUAGE' : $this->_languageName) . ' translation of ' . ($isTemplate ? 'PROJECT' : $this->_projectName) . "\n";
- if (!empty($this->_authors)) {
- $output .= '# Generated by ' . implode("\n# ", $this->_authors) . "\n";
- }
- $output .= "#\n";
- // Add the actual header information.
- $output .= "msgid \"\"\n";
- $output .= "msgstr \"\"\n";
- $output .= "\"Project-Id-Version: PROJECT VERSION\\n\"\n";
- $output .= "\"POT-Creation-Date: " . $this->_po_date . "\\n\"\n";
- $output .= "\"PO-Revision-Date: " . $this->_po_date . "\\n\"\n";
- $output .= "\"Last-Translator: NAME <EMAIL@ADDRESS>\\n\"\n";
- $output .= "\"Language-Team: LANGUAGE <EMAIL@ADDRESS>\\n\"\n";
- $output .= "\"MIME-Version: 1.0\\n\"\n";
- $output .= "\"Content-Type: text/plain; charset=utf-8\\n\"\n";
- $output .= "\"Content-Transfer-Encoding: 8bit\\n\"\n";
- $output .= "\"Plural-Forms: " . $this->_pluralForms . "\\n\"\n";
- $output .= "\n";
- return $output;
- }
- /**
- * Parses a Plural-Forms entry from a Gettext Portable Object file header.
- *
- * @param string $pluralforms
- * The Plural-Forms entry value.
- *
- * @return array|boolean
- * An array containing the number of plural forms and the converted version
- * of the formula that can be evaluated with PHP later.
- *
- * @throws \Exception
- * Throws exception in case plural formula could not be parsed.
- */
- public function parsePluralForms($pluralforms) {
- // First, delete all whitespace.
- $pluralforms = strtr($pluralforms, array(" " => "", "\t" => ""));
- // Select the parts that define nplurals and plural.
- $nplurals = strstr($pluralforms, "nplurals=");
- if (strpos($nplurals, ";")) {
- // We want the string from the 10th char, because "nplurals=" length is 9.
- $nplurals = substr($nplurals, 9, strpos($nplurals, ";") - 9);
- }
- else {
- return FALSE;
- }
- $plural = strstr($pluralforms, "plural=");
- if (strpos($plural, ";")) {
- // We want the string from the 8th char, because "plural=" length is 7.
- $plural = substr($plural, 7, strpos($plural, ";") - 7);
- }
- else {
- return FALSE;
- }
- // Get PHP version of the plural formula.
- $plural = $this->parseArithmetic($plural);
- if ($plural !== FALSE) {
- return array($nplurals, $plural);
- }
- else {
- throw new Exception('The plural formula could not be parsed.');
- }
- }
- /**
- * Parses a Gettext Portable Object file header.
- *
- * @param string $header
- * A string containing the complete header.
- *
- * @return array
- * An associative array of key-value pairs.
- */
- private function parseHeader($header) {
- $header_parsed = array();
- $lines = array_map('trim', explode("\n", $header));
- foreach ($lines as $line) {
- if ($line) {
- list($tag, $contents) = explode(":", $line, 2);
- $header_parsed[trim($tag)] = trim($contents);
- }
- }
- return $header_parsed;
- }
- /**
- * Parses and sanitizes an arithmetic formula into a PHP expression.
- *
- * While parsing, we ensure, that the operators have the right
- * precedence and associativity.
- *
- * @param string $string
- * A string containing the arithmetic formula.
- *
- * @return string|FALSE
- * A version of the formula to evaluate with PHP later.
- */
- private function parseArithmetic($string) {
- // Operator precedence table.
- $precedence = array("(" => -1, ")" => -1, "?" => 1, ":" => 1, "||" => 3, "&&" => 4, "==" => 5, "!=" => 5, "<" => 6, ">" => 6, "<=" => 6, ">=" => 6, "+" => 7, "-" => 7, "*" => 8, "/" => 8, "%" => 8);
- // Right associativity.
- $right_associativity = array("?" => 1, ":" => 1);
- $tokens = $this->tokenizeFormula($string);
- // Parse by converting into infix notation then back into postfix
- // Operator stack - holds math operators and symbols.
- $operator_stack = array();
- // Element Stack - holds data to be operated on.
- $element_stack = array();
- foreach ($tokens as $token) {
- $current_token = $token;
- // Numbers and the $n variable are simply pushed into $element_stack.
- if (is_numeric($token)) {
- $element_stack[] = $current_token;
- }
- elseif ($current_token == "n") {
- $element_stack[] = '$n';
- }
- elseif ($current_token == "(") {
- $operator_stack[] = $current_token;
- }
- elseif ($current_token == ")") {
- $topop = array_pop($operator_stack);
- while (isset($topop) && ($topop != "(")) {
- $element_stack[] = $topop;
- $topop = array_pop($operator_stack);
- }
- }
- elseif (!empty($precedence[$current_token])) {
- // If it's an operator, then pop from $operator_stack into
- // $element_stack until the precedence in $operator_stack is less
- // than current, then push into $operator_stack.
- $topop = array_pop($operator_stack);
- while (isset($topop) && ($precedence[$topop] >= $precedence[$current_token]) && !(($precedence[$topop] == $precedence[$current_token]) && !empty($right_associativity[$topop]) && !empty($right_associativity[$current_token]))) {
- $element_stack[] = $topop;
- $topop = array_pop($operator_stack);
- }
- if ($topop) {
- // Return element to top.
- $operator_stack[] = $topop;
- }
- // Parentheses are not needed.
- $operator_stack[] = $current_token;
- }
- else {
- return FALSE;
- }
- }
- // Flush operator stack.
- $topop = array_pop($operator_stack);
- while ($topop != NULL) {
- $element_stack[] = $topop;
- $topop = array_pop($operator_stack);
- }
- // Now extract formula from stack.
- $previous_size = count($element_stack) + 1;
- while (count($element_stack) < $previous_size) {
- $previous_size = count($element_stack);
- for ($i = 2; $i < count($element_stack); $i++) {
- $op = $element_stack[$i];
- if (!empty($precedence[$op])) {
- $f = "";
- if ($op == ":") {
- $f = $element_stack[$i - 2] . "):" . $element_stack[$i - 1] . ")";
- }
- elseif ($op == "?") {
- $f = "(" . $element_stack[$i - 2] . "?(" . $element_stack[$i - 1];
- }
- else {
- $f = "(" . $element_stack[$i - 2] . $op . $element_stack[$i - 1] . ")";
- }
- array_splice($element_stack, $i - 2, 3, $f);
- break;
- }
- }
- }
- // If only one element is left, the number of operators is appropriate.
- if (count($element_stack) == 1) {
- return $element_stack[0];
- }
- else {
- return FALSE;
- }
- }
- /**
- * Tokenize the formula.
- *
- * @param string $formula
- * A string containing the arithmetic formula.
- *
- * @return array
- * List of arithmetic tokens identified in the formula.
- */
- private function tokenizeFormula($formula) {
- $formula = str_replace(" ", "", $formula);
- $tokens = array();
- for ($i = 0; $i < strlen($formula); $i++) {
- if (is_numeric($formula[$i])) {
- $num = $formula[$i];
- $j = $i + 1;
- while ($j < strlen($formula) && is_numeric($formula[$j])) {
- $num .= $formula[$j];
- $j++;
- }
- $i = $j - 1;
- $tokens[] = $num;
- }
- elseif ($pos = strpos(" =<>!&|", $formula[$i])) {
- $next = $formula[$i + 1];
- switch ($pos) {
- case 1:
- case 2:
- case 3:
- case 4:
- if ($next == '=') {
- $tokens[] = $formula[$i] . '=';
- $i++;
- }
- else {
- $tokens[] = $formula[$i];
- }
- break;
- case 5:
- if ($next == '&') {
- $tokens[] = '&&';
- $i++;
- }
- else {
- $tokens[] = $formula[$i];
- }
- break;
- case 6:
- if ($next == '|') {
- $tokens[] = '||';
- $i++;
- }
- else {
- $tokens[] = $formula[$i];
- }
- break;
- }
- }
- else {
- $tokens[] = $formula[$i];
- }
- }
- return $tokens;
- }
- }
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