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   1  <?php
   2  
   3  class Scribunto_LuaParserFunctionsLibrary extends Scribunto_LuaLibraryBase {
   4  	public function register() {
   5          $lib = array(
   6              'expr' => array( $this, 'expr' ),
   7          );
   8  
   9          $this->getEngine()->registerInterface( __DIR__ . '/mw.ext.ParserFunctions.lua', $lib, array() );
  10      }
  11  
  12  	public function expr( $expression = null ) {
  13          $this->checkType( 'mw.ext.ParserFunctions.expr', 1, $expression, 'string' );
  14          try {
  15              return array( ExtParserFunctions::getExprParser()->doExpression( $expression ) );
  16          } catch ( ExprError $e ) {
  17              throw new Scribunto_LuaError( $e->getMessage() );
  18          }
  19      }
  20  
  21  }