<?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

 *

 * @package Smarty

 * @subpackage Config

 */

class Smarty_Internal_Config_File_Compiler {

    /**

     * Lexer object

     *

     * @var object

     */

    public $lex;

    /**

     * Parser object

     *

     * @var object

     */

    public $parser;

    /**

     * Smarty object

     *

     * @var Smarty object

     */

    public $smarty;

    /**

     * Smarty object

     *

     * @var Smarty_Internal_Config object

     */

    public $config;

    /**

     * Compiled config data sections and variables

     *

     * @var array

     */

    public $config_data = array();

    /**

     * Initialize compiler

     *

     * @param Smarty $smarty base instance

     */

    public function __construct($smarty)

    {

        $this->smarty = $smarty;

        $this->config_data['sections'] = array();

        $this->config_data['vars'] = array();

    }

    /**

     * Method to compile a Smarty template.

     *

     * @param  Smarty_Internal_Config $config config object

     * @return bool true if compiling succeeded, false if it failed

     */

    public function compileSource(Smarty_Internal_Config $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->source->content . "\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);

        if ($this->smarty->_parserdebug) $parser->PrintTrace();

        // get tokens from lexer and parse them

        while ($lex->yylex()) {

            if ($this->smarty->_parserdebug) echo "<br>Parsing  {$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 = '<?php $_config_vars = ' . var_export($this->config_data, true) . '; ?>';

    }

    /**

     * 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

     *

     * @param string $args 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->source->filepath}' 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 SmartyCompilerException($error_text);

    }

}

?>