531 lines
17 KiB
PHP
531 lines
17 KiB
PHP
<?php
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/**
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* This file is part of the POMO package.
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*
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* @copyright 2014 POMO
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* @license GPL
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*/
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namespace POMO;
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use POMO\Translations\EntryTranslations;
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use POMO\Translations\GettextTranslations;
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ini_set('auto_detect_line_endings', 1);
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/**
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* Class for working with PO files.
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*/
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class PO extends GettextTranslations
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{
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const MAX_LINE_LEN = 79;
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public $comments_before_headers = '';
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/**
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* Exports headers to a PO entry
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*
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* @return string msgid/msgstr PO entry for this PO file headers, doesn't contain newline at the end
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*/
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public function export_headers()
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{
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$header_string = '';
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foreach ($this->headers as $header => $value) {
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$header_string .= "$header: $value\n";
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}
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$poified = self::poify($header_string);
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if ($this->comments_before_headers) {
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$before_headers = self::prepend_each_line(rtrim($this->comments_before_headers) . "\n", '# ');
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} else {
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$before_headers = '';
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}
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return rtrim("{$before_headers}msgid \"\"\nmsgstr $poified");
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}
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/**
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* Exports all entries to PO format
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*
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* @return string sequence of mgsgid/msgstr PO strings, doesn't containt newline at the end
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*/
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public function export_entries()
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{
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// TODO: Sorting.
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return implode("\n\n", array_map(array(__NAMESPACE__ . '\PO', 'export_entry'), $this->entries));
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}
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/**
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* Exports the whole PO file as a string
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*
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* @param bool $include_headers whether to include the headers in the export
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* @return string ready for inclusion in PO file string for headers and all the enrtries
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*/
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public function export($include_headers = true)
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{
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$res = '';
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if ($include_headers) {
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$res .= $this->export_headers();
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$res .= "\n\n";
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}
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$res .= $this->export_entries();
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return $res;
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}
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/**
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* Same as {@link export}, but writes the result to a file
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*
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* @param string $filename Where to write the PO string.
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* @param bool $include_headers Whether to include the headers in the export.
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* @return bool true on success, false on error
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*/
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public function export_to_file($filename, $include_headers = true)
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{
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$fh = fopen($filename, 'w');
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if (false === $fh) {
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return false;
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}
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$export = $this->export($include_headers);
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$res = fwrite($fh, $export);
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if (false === $res) {
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return false;
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}
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return fclose($fh);
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}
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/**
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* Text to include as a comment before the start of the PO contents
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*
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* Doesn't need to include # in the beginning of lines, these are added automatically
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*
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* @param string $text Text to include as a comment.
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*/
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public function set_comment_before_headers($text)
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{
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$this->comments_before_headers = $text;
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}
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/**
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* Formats a string in PO-style
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*
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* @param string $input_string the string to format
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* @return string the poified string
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*/
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public static function poify($input_string)
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{
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$quote = '"';
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$slash = '\\';
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$newline = "\n";
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$replaces = array(
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"$slash" => "$slash$slash",
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"$quote" => "$slash$quote",
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"\t" => '\t',
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);
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$input_string = str_replace(array_keys($replaces), array_values($replaces), $input_string);
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$po = $quote . implode("{$slash}n{$quote}{$newline}{$quote}", explode($newline, $input_string)) . $quote;
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// Add empty string on first line for readbility.
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if (
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false !== strpos($input_string, $newline) &&
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(substr_count($input_string, $newline) > 1 || substr($input_string, -strlen($newline)) !== $newline)
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) {
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$po = "$quote$quote$newline$po";
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}
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// Remove empty strings.
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$po = str_replace("$newline$quote$quote", '', $po);
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return $po;
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}
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/**
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* Gives back the original string from a PO-formatted string
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*
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* @param string $input_string PO-formatted string
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* @return string enascaped string
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*/
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public static function unpoify($input_string)
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{
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$escapes = array(
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't' => "\t",
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'n' => "\n",
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'r' => "\r",
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'\\' => '\\',
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);
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$lines = array_map('trim', explode("\n", $input_string));
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$lines = array_map(array(__NAMESPACE__ . '\PO', 'trim_quotes'), $lines);
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$unpoified = '';
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$previous_is_backslash = false;
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foreach ($lines as $line) {
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preg_match_all('/./u', $line, $chars);
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$chars = $chars[0];
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foreach ($chars as $char) {
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if (! $previous_is_backslash) {
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if ('\\' === $char) {
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$previous_is_backslash = true;
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} else {
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$unpoified .= $char;
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}
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} else {
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$previous_is_backslash = false;
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$unpoified .= isset($escapes[ $char ]) ? $escapes[ $char ] : $char;
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}
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}
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}
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// Standardize the line endings on imported content, technically PO files shouldn't contain \r.
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$unpoified = str_replace(array("\r\n", "\r"), "\n", $unpoified);
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return $unpoified;
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}
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/**
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* Inserts $with in the beginning of every new line of $input_string and
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* returns the modified string
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*
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* @param string $input_string prepend lines in this string
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* @param string $with prepend lines with this string
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*/
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public static function prepend_each_line($input_string, $with)
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{
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$lines = explode("\n", $input_string);
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$append = '';
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if ("\n" === substr($input_string, -1) && '' === end($lines)) {
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/*
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* Last line might be empty because $input_string was terminated
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* with a newline, remove it from the $lines array,
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* we'll restore state by re-terminating the string at the end.
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*/
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array_pop($lines);
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$append = "\n";
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}
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foreach ($lines as &$line) {
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$line = $with . $line;
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}
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unset($line);
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return implode("\n", $lines) . $append;
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}
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/**
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* Prepare a text as a comment -- wraps the lines and prepends #
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* and a special character to each line
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*
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* @param string $text the comment text
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* @param string $char character to denote a special PO comment,
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* like :, default is a space
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*/
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private static function comment_block($text, $char = ' ')
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{
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$text = wordwrap($text, self::MAX_LINE_LEN - 3);
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return self::prepend_each_line($text, "#$char ");
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}
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/**
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* Builds a string from the entry for inclusion in PO file
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*
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* @param EntryTranslations $entry the entry to convert to po string.
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* @return string|false PO-style formatted string for the entry or
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* false if the entry is empty
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*/
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public static function export_entry(EntryTranslations &$entry)
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{
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if (null === $entry->singular || '' === $entry->singular) {
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return false;
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}
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$po = array();
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if (! empty($entry->translator_comments)) {
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$po[] = self::comment_block($entry->translator_comments);
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}
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if (! empty($entry->extracted_comments)) {
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$po[] = self::comment_block($entry->extracted_comments, '.');
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}
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if (! empty($entry->references)) {
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$po[] = self::comment_block(implode(' ', $entry->references), ':');
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}
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if (! empty($entry->flags)) {
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$po[] = self::comment_block(implode(', ', $entry->flags), ',');
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}
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if ($entry->context) {
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$po[] = 'msgctxt ' . self::poify($entry->context);
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}
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$po[] = 'msgid ' . self::poify($entry->singular);
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if (! $entry->is_plural) {
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$translation = empty($entry->translations) ? '' : $entry->translations[0];
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$translation = self::match_begin_and_end_newlines($translation, $entry->singular);
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$po[] = 'msgstr ' . self::poify($translation);
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} else {
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$po[] = 'msgid_plural ' . self::poify($entry->plural);
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$translations = empty($entry->translations) ? array( '', '' ) : $entry->translations;
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foreach ($translations as $i => $translation) {
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$translation = self::match_begin_and_end_newlines($translation, $entry->plural);
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$po[] = "msgstr[$i] " . self::poify($translation);
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}
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}
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return implode("\n", $po);
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}
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public static function match_begin_and_end_newlines($translation, $original)
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{
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if ('' === $translation) {
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return $translation;
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}
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$original_begin = "\n" === substr($original, 0, 1);
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$original_end = "\n" === substr($original, -1);
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$translation_begin = "\n" === substr($translation, 0, 1);
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$translation_end = "\n" === substr($translation, -1);
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if ($original_begin) {
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if (! $translation_begin) {
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$translation = "\n" . $translation;
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}
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} elseif ($translation_begin) {
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$translation = ltrim($translation, "\n");
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}
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if ($original_end) {
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if (! $translation_end) {
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$translation .= "\n";
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}
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} elseif ($translation_end) {
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$translation = rtrim($translation, "\n");
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}
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return $translation;
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}
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/**
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* @param string $filename
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*
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* @return bool
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*/
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public function import_from_file($filename)
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{
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$f = fopen($filename, 'r');
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if (! $f) {
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return false;
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}
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$lineno = 0;
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while (true) {
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$res = $this->read_entry($f, $lineno);
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if (! $res) {
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break;
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}
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if ('' === $res['entry']->singular) {
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$this->set_headers($this->make_headers($res['entry']->translations[0]));
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} else {
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$this->add_entry($res['entry']);
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}
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}
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self::read_line($f, 'clear');
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if (false === $res) {
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return false;
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}
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if (! $this->headers && ! $this->entries) {
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return false;
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}
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return true;
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}
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/**
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* Helper function for read_entry
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*
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* @param string $context
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* @return bool
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*/
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protected static function is_final($context)
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{
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return ('msgstr' === $context) || ('msgstr_plural' === $context);
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}
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/**
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* @param resource $f
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* @param int $lineno
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* @return null|false|array
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*/
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public function read_entry($f, $lineno = 0)
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{
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$entry = new EntryTranslations();
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// Where were we in the last step.
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// Can be: comment, msgctxt, msgid, msgid_plural, msgstr, msgstr_plural.
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$context = '';
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$msgstr_index = 0;
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while (true) {
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$lineno++;
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$line = self::read_line($f);
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if (! $line) {
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if (feof($f)) {
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if (self::is_final($context)) {
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break;
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} elseif (! $context) { // We haven't read a line and EOF came.
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return null;
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} else {
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return false;
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}
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} else {
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return false;
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}
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}
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if ("\n" === $line) {
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continue;
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}
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$line = trim($line);
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if (preg_match('/^#/', $line, $m)) {
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// The comment is the start of a new entry.
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if (self::is_final($context)) {
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self::read_line($f, 'put-back');
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$lineno--;
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break;
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}
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// Comments have to be at the beginning.
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if ($context && 'comment' !== $context) {
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return false;
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}
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// Add comment.
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$this->add_comment_to_entry($entry, $line);
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} elseif (preg_match('/^msgctxt\s+(".*")/', $line, $m)) {
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if (self::is_final($context)) {
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self::read_line($f, 'put-back');
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$lineno--;
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break;
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}
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if ($context && 'comment' !== $context) {
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return false;
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}
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$context = 'msgctxt';
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$entry->context .= self::unpoify($m[1]);
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} elseif (preg_match('/^msgid\s+(".*")/', $line, $m)) {
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if (self::is_final($context)) {
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self::read_line($f, 'put-back');
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$lineno--;
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break;
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}
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if ($context && 'msgctxt' !== $context && 'comment' !== $context) {
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return false;
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}
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$context = 'msgid';
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$entry->singular .= self::unpoify($m[1]);
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} elseif (preg_match('/^msgid_plural\s+(".*")/', $line, $m)) {
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if ('msgid' !== $context) {
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return false;
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}
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$context = 'msgid_plural';
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$entry->is_plural = true;
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$entry->plural .= self::unpoify($m[1]);
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} elseif (preg_match('/^msgstr\s+(".*")/', $line, $m)) {
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if ('msgid' !== $context) {
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return false;
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}
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$context = 'msgstr';
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$entry->translations = array(self::unpoify($m[1]));
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} elseif (preg_match('/^msgstr\[(\d+)\]\s+(".*")/', $line, $m)) {
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if ('msgid_plural' !== $context && 'msgstr_plural' !== $context) {
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return false;
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}
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$context = 'msgstr_plural';
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$msgstr_index = $m[1];
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$entry->translations[$m[1]] = self::unpoify($m[2]);
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} elseif (preg_match('/^".*"$/', $line)) {
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$unpoified = self::unpoify($line);
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switch ($context) {
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case 'msgid':
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$entry->singular .= $unpoified;
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break;
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case 'msgctxt':
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$entry->context .= $unpoified;
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break;
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case 'msgid_plural':
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$entry->plural .= $unpoified;
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break;
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case 'msgstr':
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$entry->translations[0] .= $unpoified;
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break;
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case 'msgstr_plural':
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$entry->translations[$msgstr_index] .= $unpoified;
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break;
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default:
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return false;
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}
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} else {
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return false;
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}
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}
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$have_translations = false;
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foreach ($entry->translations as $t) {
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if ($t || ('0' === $t)) {
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$have_translations = true;
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break;
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}
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}
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if (false === $have_translations) {
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$entry->translations = array();
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}
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return array(
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'entry' => $entry,
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'lineno' => $lineno,
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);
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}
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/**
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* @param resource $f
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* @param string $action
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* @return bool
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*/
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public static function read_line($f, $action = 'read')
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{
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static $last_line = '';
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static $use_last_line = false;
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if ('clear' === $action) {
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$last_line = '';
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return true;
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}
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if ('put-back' === $action) {
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$use_last_line = true;
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return true;
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}
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$line = $use_last_line ? $last_line : fgets($f);
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$line = ("\r\n" === substr($line, -2)) ? rtrim($line, "\r\n") . "\n" : $line;
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$last_line = $line;
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$use_last_line = false;
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return $line;
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}
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/**
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* @param EntryTranslations $entry
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* @param string $po_comment_line
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*/
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public function add_comment_to_entry(EntryTranslations &$entry, $po_comment_line)
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{
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$first_two = substr($po_comment_line, 0, 2);
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$comment = trim(substr($po_comment_line, 2));
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if ('#:' === $first_two) {
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$entry->references = array_merge($entry->references, preg_split('/\s+/', $comment));
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} elseif ('#.' === $first_two) {
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$entry->extracted_comments = trim($entry->extracted_comments . "\n" . $comment);
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} elseif ('#,' === $first_two) {
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$entry->flags = array_merge($entry->flags, preg_split('/,\s*/', $comment));
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} else {
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$entry->translator_comments = trim($entry->translator_comments . "\n" . $comment);
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}
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}
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/**
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* @param string $s
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* @return string
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*/
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public static function trim_quotes($s)
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{
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if ('"' === substr($s, 0, 1)) {
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$s = substr($s, 1);
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}
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if ('"' === substr($s, -1, 1)) {
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$s = substr($s, 0, -1);
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}
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return $s;
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}
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}
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