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File: test_langs.php
<?php
# MantisBT - a php based bugtracking system

# MantisBT is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# MantisBT is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with MantisBT.  If not, see <http://www.gnu.org/licenses/>.

/**
 * @package MantisBT
 * @copyright Copyright (C) 2000 - 2002  Kenzaburo Ito - kenito@300baud.org
 * @copyright Copyright (C) 2002 - 2011  MantisBT Team - mantisbt-dev@lists.sourceforge.net
 * @link http://www.mantisbt.org
 */

define( 'PLUGINS_DISABLED', true ); 
$g_skip_lang_load = true;

/**
 * MantisBT Core API's
 */
require_once( dirname( dirname( __FILE__ ) ) . DIRECTORY_SEPARATOR . 'core.php' );

access_ensure_global_level( config_get_global( 'admin_site_threshold' ) );

if( function_exists( 'xdebug_disable' ) ) {
	xdebug_disable();
}

if( !defined( 'T_ML_COMMENT' ) ) {
	define( 'T_ML_COMMENT', T_COMMENT );
}
else {
	define( 'T_DOC_COMMENT', T_ML_COMMENT );
}

if (!checkfile( dirname( dirname( __FILE__ ) ) . DIRECTORY_SEPARATOR . 'lang' . DIRECTORY_SEPARATOR, 'strings_english.txt', true)) {
	print_error( "FAILED: Language file 'strings_english.txt' failed." );
	die;
}

unset( $g_skip_lang_load ) ;
lang_push( 'english' );

set_time_limit( 0 );

html_page_top();

// check core language files
if( function_exists( 'opendir' ) && function_exists( 'readdir' ) ) {
	$t_lang_files = Array();
	if( $t_handle = opendir( dirname( dirname( __FILE__ ) ) . DIRECTORY_SEPARATOR . 'lang' ) ) {
		while( false !== ( $t_file = readdir( $t_handle ) ) ) {
			if ($t_file == 'strings_english.txt' ) {
				echo "Testing english language file '$t_file' (phase 1)...<br />";
				flush();
				checkfile( dirname( dirname( __FILE__ ) ) . DIRECTORY_SEPARATOR . 'lang' . DIRECTORY_SEPARATOR, $t_file );
			}
			if( $t_file[0] != '.' && $t_file != 'langreadme.txt' && !is_dir( $t_file ) ) {
				$t_lang_files[] = $t_file;
			}
		}
		closedir( $t_handle );
	}
}
else {
	$t_lang_files = Array();
	foreach( $g_language_choices_arr as $t_lang ) {
		if( $t_lang == 'auto' ) {
			continue;
		}
		$t_lang_files[] = $t_lang;
	}
}

if( count( $t_lang_files ) > 0 ) {
	echo 'Retrieved ', count( $t_lang_files ), ' languages<br />';

	foreach( $t_lang_files as $t_file ) {
		echo "Testing language file '$t_file' (phase 1)...<br />";
		flush();

		checkfile( dirname( dirname( __FILE__ ) ) . DIRECTORY_SEPARATOR . 'lang' . DIRECTORY_SEPARATOR, $t_file );
	}
}

// attempt to find plugin language files
echo "Trying to find+check plugin language files...<br />";
if( function_exists( 'opendir' ) && function_exists( 'readdir' ) ) {
	checklangdir ( config_get( 'plugin_path' ) );
} else {
	echo 'php opendir/readdir are disabled - skipping<br />';
}

function checklangdir( $p_path, $p_subpath = '' ) {
	$p_path = $p_path . DIRECTORY_SEPARATOR . $p_subpath . DIRECTORY_SEPARATOR;
	if( $handle = opendir( $p_path ) ) {
		while( false !== ( $file = readdir( $handle ) ) ) {
			if ( $file[0] == '.' )
				continue;
			if ( $p_subpath == '' ) {
				echo "Checking language files for plugin $file:<br />";

				if (file_exists( $p_path . DIRECTORY_SEPARATOR . $p_subpath . DIRECTORY_SEPARATOR . $file . DIRECTORY_SEPARATOR . 'lang' . DIRECTORY_SEPARATOR . 'strings_english.txt' ) ) {
					echo "Testing english language for plugin '$file' (phase 1)...<br />";
					flush();
					checkfile( $p_path . DIRECTORY_SEPARATOR . $p_subpath . DIRECTORY_SEPARATOR . $file . DIRECTORY_SEPARATOR . 'lang' . DIRECTORY_SEPARATOR,  'strings_english.txt' );			
				}
			}

			if( !is_dir( $p_path . DIRECTORY_SEPARATOR . $file ) && $p_subpath == 'lang' ) {
				checkfile( $p_path, $file );
			} else {
				if ( is_dir( $p_path . DIRECTORY_SEPARATOR . $file ) )
					checklangdir( $p_path, $file);
			}
		}
		closedir( $handle );
	}
}


function checkfile( $p_path, $p_file, $p_quiet = false ) {
		if( !$p_quiet) {
			echo "Testing language file '$p_file' (phase 1)...<br />";
			flush();
		}

		$file = $p_path . $p_file;

		set_error_handler( 'lang_error_handler' );
		$result = checktoken( $file, ($p_file == 'strings_english.txt' ? true : false) );
		restore_error_handler();

		if( !$result ) {
			print_error( "FAILED: Language file '$p_file' failed at phase 1." );
			if( $p_quiet ) {
				return false;
			}
		}

		if( !$p_quiet ) {
			echo "Testing language file '$p_file' (phase 2)...<br />";
			flush();
		} else {
			return true;
		}

		set_error_handler( 'lang_error_handler' );
		ob_start();
		$result = eval( "require_once( '$file' );" );
		$data = ob_get_contents();
		ob_end_clean();
		restore_error_handler();

		if( $result === false ) {
			print_error( "FAILED: Language file '$p_file' failed at eval" );
			if( $p_quiet ) {
				return false;
			}
		}

		if( !empty( $data ) ) {
			print_error( "FAILED: Language file '$p_file' failed at require_once (data output: " . var_export( $data, true ) . ")" );
			if( $p_quiet ) {
				return false;
			}
		}
		return true;
}

$basevariables = Array();

function checktoken( $file, $base = false ) {
	$in_php_code = false;
	$variables = Array();
	global $basevariables;	
	$current_var = null;
	$last_token = 0;
	$set_variable = false;
	$variablearr = false;
	$twopartstring = false;
	$need_end_variable = false;
	$source = file_get_contents( $file );
	$tokens = @token_get_all( $source );
	$expectendarr = false;
	$settingvariable = false;
	$pass = true;
	$fatal = false;
	foreach( $tokens as $token ) {
		$last_token2 = 0;
		if( is_string( $token ) ) {
			switch( $token ) {
				case '=':
					if( $last_token != T_VARIABLE ) {
						print_error( "ERROR: = sign without variable" );
						$pass = false;
					}
					$set_variable = true;
					break;
				case '[':
					if( $last_token != T_VARIABLE ) {
						$pass = false;
					}
					$variablearr = true;
					break;
				case ']':
					if( !$expectendarr ) {
						$pass = false;
					}
					$expectendarr = false;
					break;
				case ';':
					if( !$need_end_variable ) {
						print_error( "ERROR: function seperator found at unexpected location (line $line)" );
						$pass = false;
					}
					$need_end_variable = false;
					break;
				case '.':
					if( $last_token == T_CONSTANT_ENCAPSED_STRING ) {
						$twopartstring = true;
					} else {
						print_error( "ERROR: string concat found at unexpected location (line $line)" );
						$pass = false;
					}
					break;
				default:
					print_error( "UNKNOWN TOKEN" . $token );
					$pass = false;
					break;
			}
		} else {
			// token array
			list( $id, $text, $line ) = $token;

			if( $id == T_WHITESPACE || $id == T_COMMENT || $id == T_DOC_COMMENT || $id == T_ML_COMMENT ) {
				continue;
			}
			if( $need_end_variable ) {
				if( $twopartstring && $id == T_CONSTANT_ENCAPSED_STRING ) {
					$twopartstring = false;
					continue;
				}
				if( $settingvariable && $id == T_STRING ) {
					$last_token = T_VARIABLE;
					$expectendarr = true;
					continue;
				}

				print_error( "ERROR" . $id . token_name( $id ) . $text . $line );
				$pass = false;
			}

			switch( $id ) {
				case T_OPEN_TAG:
					$in_php_code = true;
					break;
				case T_CLOSE_TAG:
					$in_php_code = false;
					break;
				case T_INLINE_HTML:
					print_error( "ERROR: Whitespace in language file outside of PHP code block (line $line)" );
					$pass = false;
					break;
				case T_VARIABLE:
					if( $set_variable && $current_var != null ) {
						$need_end_variable = true;
						$settingvariable = true;
						$current_var = null;
						break;
					}
					$current_var = $text;
					break;
				case T_STRING:
					if( $variablearr ) {
						$current_var .= $text;
						if( !defined( $text ) ) {
							print_error( "undefined constant: $current_var" );
						}
					} else {
						print_error( "ERROR: T_STRING found at unexpected location (line $line)" );
						$pass = false;
					}
					if ( strpos($current_var,"\n") !== false ) {
						print_error( "PARSER - NEW LINE IN STRING: " . $id . token_name( $id ) . $text . $line );
						$pass = false;
						$fatal = true;
					}					
					$last_token2 = T_VARIABLE;
					$expectendarr = true;
					break;
				case T_CONSTANT_ENCAPSED_STRING:
					if ( $token[1][0] != '\'' ) {
							print_error( "ERROR: Language strings should be single-quoted (line $line)" );						
					}
					if( $last_token == T_VARIABLE && $set_variable && $current_var != null ) {
						if( isset( $variables[$current_var] ) ) {
							print_error( "ERROR: duplicate language string ($current_var ) (line $line)" );
						} else {
							$variables[$current_var] = $text;
						}
						
						if ( $base ) {
							// english
							//if( isset( $basevariables[$current_var] ) ) {
							//	print_error( "WARN: english string redefined - plugin? $current_var" );
							//}
							$basevariables[$current_var] = true;
						} else {
							if( !isset( $basevariables[$current_var] ) ) {
								print_error( "WARN: String defined in non-english file that does not exist ( $current_var )" ); 
							//} else {
								// missing translation
							}
						}
						
					}
					if ( strpos($current_var,"\n") !== false ) {
						print_error( "PARSER - NEW LINE IN STRING: " . $id . token_name( $id ) . $text . $line );
						$pass = false;
						$fatal = true;
					}
					$current_var = null;
					$need_end_variable = true;
					break;
				default:
					// if (!$in_php_code)
					print_error( "PARSER: " . $id . token_name( $id ) . $text . $line );
					$pass = false;
					break;
			}

			$last_token = $id;
			if( $last_token2 > 0 ) {
				$last_token = $last_token2;
			}
		}
		
		if ($fatal)
			break;
	}

	return $pass;
}

function lang_error_handler( $p_type, $p_error, $p_file, $p_line, $p_context ) {
	print_error( "error handler thrown: " . $p_type . '<br />' . $p_error . '<br />' . $p_file . '<br />' . $p_line . '<br />' . $p_context );
}

function print_error( $p_string ) {
	echo "<font color='red'>ERROR: ", $p_string, '</font><br />';
}

html_page_bottom();