Index: gp-includes/formats/format_strings.php
===================================================================
--- gp-includes/formats/format_strings.php	(revision 0)
+++ gp-includes/formats/format_strings.php	(revision 0)
@@ -0,0 +1,116 @@
+<?php
+
+class GP_Format_Strings {
+	
+	var $extension = 'strings';
+	
+	var $exported = '';
+	
+	function sort_entries( $a, $b ) {
+		if ( $a->context == $b->context ) {
+			return 0;
+		}
+		return ( $a->context > $b->context ) ? +1 : -1;
+	}
+	
+	function print_exported_file( $project, $locale, $translation_set, $entries ) {
+		$result = '';
+		$prefix = pack( 'CC', 0xff, 0xfe ); // Add BOM
+		
+		$sorted_entries = $entries;
+		usort( $sorted_entries, array( 'GP_Format_Strings', 'sort_entries' ) );
+		foreach ( $sorted_entries as $entry ) {
+			$original = str_replace( "\n", "\\n", $entry->context );
+			$translation = str_replace( "\n", "\\n", empty( $entry->translations ) ? $entry->context : $entry->translations[0] );
+			$comment = preg_replace( "/(^\s+)|(\s+$)/us", "", $entry->extracted_comments ); 
+			if ( $comment == "" ) {
+				$comment = "No comment provided by engineer.";
+			}
+			$result .= "/* $comment */\n\"$original\" = \"$translation\";\n\n";
+		}
+		
+		return $prefix . mb_convert_encoding( $result, 'UTF-16LE' );
+	}
+	
+	function read_translations_from_file( $file_name, $project = null ) {
+		if ( is_null( $project ) ) return false;
+		$translations = $this->read_originals_from_file( $file_name );
+		if ( !$translations ) return false;
+		$originals = GP::$original->by_project_id( $project->id );
+		$new_translations = new Translations;
+		foreach( $translations->entries as $key => $entry ) {
+			// we have been using read_originals_from_file to parse the file
+			// so we need to swap singular and translation			
+			if ( $entry->context == $entry->singular ) {
+				$entry->translations = array();
+			} else {
+				$entry->translations = array( $entry->singular );				
+			}
+			$entry->singular = null;
+			foreach( $originals as $original ) {
+				if ( $original->context == $entry->context ) {
+					$entry->singular = $original->singular;
+					break;
+				}
+			}
+			if ( !$entry->singular ) {
+				error_log( sprintf( __("Missing context %s in project #%d"), $entry->context, $project->id ) );
+				continue;
+			}
+			
+			$new_translations->add_entry( $entry );
+		}
+		return $new_translations;
+		
+	}
+
+	function read_originals_from_file( $file_name ) {
+		$entries = new Translations;
+		$f = fopen( $file_name, 'r' );
+		if ( !$f ) return false;
+		$context = $comment = null;
+		$lineno = 1;
+		while ( false !== ( $line = fgets( $f ) ) ) {
+			if ( $lineno == 1 ) {
+				if ( substr( $line, 0, 2 ) == pack( "CC", 0xef, 0xff ) ) {
+					$line = substr( $line, 2 );
+				}
+			}
+			$line = mb_convert_encoding( $line, 'UTF-8', 'UTF-16BE' );
+			if ( is_null( $context ) ) {
+				if ( preg_match( '/^\/\*\s*(.*)\s*\*\/$/', $line, $matches ) ) {
+					if ( $matches[1] !== "No comment provided by engineer." ) {
+						$comment = $matches[1];
+					} else {
+						$comment = null;
+					}
+				} else if ( preg_match( '/^"(.*)" = "(.*)";$/', $line, $matches ) ) {
+					$entry = new Translation_Entry();
+					$entry->context = $this->unescape( $matches[1] );
+					$entry->singular = $this->unescape( $matches[2] );
+					if ( ! is_null( $comment )) {
+						$entry->extracted_comments = $comment;
+						$comment = null;
+					}
+					$entry->translations = array();
+					$entries->add_entry( $entry );
+					$entry = null;
+				}
+			}
+			$lineno++;
+		}
+		return $entries;
+	}
+
+	
+	function unescape( $string ) {
+		return stripcslashes( $string );		
+	}
+	
+	function escape( $string ) {
+		$string = addcslashes( $string, "'\n");
+		return $string;
+	}
+}
+
+GP::$formats['strings'] = new GP_Format_Strings;
\ No newline at end of file