LuaDataProvider.php

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<?php
 
class Scribunto_LuaDataProvider implements Iterator {
    protected $engine = null;
    protected $exports = null;
    protected $key = 1;
 
    public function __construct( $engine, $moduleName ) {
        $this->engine = $engine;
        $this->key = 1;
        $module = $engine->fetchModuleFromParser(
            Title::makeTitle( NS_MODULE, $moduleName )
        );
        if ( $module === null ) {
            throw new Exception( "Failed to load module $moduleName" );
        }
        // Calling executeModule with null isn't the best idea, since it brings
        // the whole export table into PHP and throws away metatables and such,
        // but for this use case, we don't have anything like that to worry about
        $this->exports = $engine->executeModule( $module->getInitChunk(), null, null );
    }
 
    public function destroy() {
        $this->engine = null;
        $this->exports = null;
    }
 
    public function rewind() {
        $this->key = 1;
    }
 
    public function valid() {
        return $this->key <= $this->exports['count'];
    }
 
    public function key() {
        return $this->key;
    }
 
    public function next() {
        $this->key++;
    }
 
    public function current() {
        return $this->engine->getInterpreter()->callFunction( $this->exports['provide'], $this->key );
    }
 
    public function run( $key ) {
        list( $ret ) = $this->engine->getInterpreter()->callFunction( $this->exports['run'], $key );
        return $ret;
    }
}