<?php

/**
* Smarty Internal Plugin Config File Compiler
* 
* This is the config file compiler class. It calls the lexer and parser to
* perform the compiling.
* 
* @package Smarty
* @subpackage Config
* @author Uwe Tews 
*/
/**
* Main config file compiler class
*/
class Smarty_Internal_Config_File_Compiler {
   public $compile_error= false;
   /**
    * Initialize compiler
    */
    public function __construct($smarty)
    {
        $this->smarty = $smarty; 
        // get required plugins
        $this->smarty->loadPlugin('Smarty_Internal_Configfilelexer');
        $this->smarty->loadPlugin('Smarty_Internal_Configfileparser');
        $this->config_data['sections'] = array();
        $this->config_data['vars'] = array();
    } 

    /**
    * Methode to compile a Smarty template
    * 
    * @param  $template template object to compile
    * @return bool true if compiling succeeded, false if it failed
    */
    public function compileSource($config)
    {
        /* here is where the compiling takes place. Smarty
       tags in the templates are replaces with PHP code,
       then written to compiled files. */ 
       $this->config = $config; 
       // get config file source
        $_content = $config->getConfigSource()."\n";
        // on empty template just return
        if ($_content == '') {
            return true;
        } 
        // init the lexer/parser to compile the config file
        $lex = new Smarty_Internal_Configfilelexer($_content, $this->smarty);
        $parser = new Smarty_Internal_Configfileparser($lex, $this); 
        // $parser->PrintTrace();
        // get tokens from lexer and parse them
        while ($lex->yylex()) {
            // echo "<br>Parsing  {$parser->yyTokenName[$lex->token]} Token {$lex->value} Line {$lex->line} \n";
            $parser->doParse($lex->token, $lex->value);
        } 
        // finish parsing process
        $parser->doParse(0, 0);

        $config->compiled_config = serialize($this->config_data);
        if (!$this->compile_error) {
            return true;
        } else {
            // compilation error
            return false;
        } 
    } 
    /**
    * display compiler error messages without dying
    * 
    * If parameter $args is empty it is a parser detected syntax error.
    * In this case the parser is called to obtain information about exspected tokens.
    * 
    * If parameter $args contains a string this is used as error message
    * 
    * @todo output exact position of parse error in source line
    * @param  $args string individual error message or null
    */
    public function trigger_config_file_error($args = null)
    {
        $this->lex = Smarty_Internal_Configfilelexer::instance();
        $this->parser = Smarty_Internal_Configfileparser::instance(); 
        // get template source line which has error
        $line = $this->lex->line;
        if (isset($args)) {
//            $line--;
        } 
        $match = preg_split("/\n/", $this->lex->data);
        $error_text = 'Syntax Error in config file "' . $this->config->getConfigFilepath() . '"  on line ' . $line . ' "'. $match[$line-1].'" ';
        if (isset($args)) {
            // individual error message
            $error_text .= $args;
        } else {
            // exspected token from parser
            foreach ($this->parser->yy_get_expected_tokens($this->parser->yymajor) as $token) {
                $exp_token = $this->parser->yyTokenName[$token];
                if (isset($this->lex->smarty_token_names[$exp_token])) {
                    // token type from lexer
                    $expect[] = '"' . $this->lex->smarty_token_names[$exp_token] . '"';
                } else {
                    // otherwise internal token name
                    $expect[] = $this->parser->yyTokenName[$token];
                } 
            } 
            // output parser error message
            $error_text .= ' - Unexpected "' . $this->lex->value . '", expected one of: ' . implode(' , ', $expect);
        } 
        throw new Exception($error_text);
        // set error flag
        $this->compile_error = true;
    } 

} 

?>
