smarty_compiler.class.php

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        $arg_list = array();

        if (empty($attrs['file'])) {
            $this->_syntax_error("missing 'file' attribute in include tag", E_USER_ERROR, __FILE__, __LINE__);
        }

        foreach ($attrs as $arg_name => $arg_value) {
            if ($arg_name == 'file') {
                $include_file = $arg_value;
                continue;
            } else if ($arg_name == 'assign') {
                $assign_var = $arg_value;
                continue;
            }
            if (is_bool($arg_value))
                $arg_value = $arg_value ? 'true' : 'false';
            $arg_list[] = "'$arg_name' => $arg_value";
        }

        $output = '<?php ';

        if (isset($assign_var)) {
            $output .= "ob_start();\n";
        }

        $output .=
            "\$_smarty_tpl_vars = \$this->_tpl_vars;\n";


        $_params = "array('smarty_include_tpl_file' => " . $include_file . ", 'smarty_include_vars' => array(".implode(',', (array)$arg_list)."))";
        $output .= "\$this->_smarty_include($_params);\n" .
        "\$this->_tpl_vars = \$_smarty_tpl_vars;\n" .
        "unset(\$_smarty_tpl_vars);\n";

        if (isset($assign_var)) {
            $output .= "\$this->assign(" . $assign_var . ", ob_get_contents()); ob_end_clean();\n";
        }

        $output .= ' ?>';

        return $output;

    }

    /**
     * Compile {include ...} tag
     *
     * @param string $tag_args
     * @return string
     */
    function _compile_include_php_tag($tag_args)
    {
        $attrs = $this->_parse_attrs($tag_args);

        if (empty($attrs['file'])) {
            $this->_syntax_error("missing 'file' attribute in include_php tag", E_USER_ERROR, __FILE__, __LINE__);
        }

        $assign_var = (empty($attrs['assign'])) ? '' : $this->_dequote($attrs['assign']);
        $once_var = (empty($attrs['once']) || $attrs['once']=='false') ? 'false' : 'true';

        $arg_list = array();
        foreach($attrs as $arg_name => $arg_value) {
            if($arg_name != 'file' AND $arg_name != 'once' AND $arg_name != 'assign') {
                if(is_bool($arg_value))
                    $arg_value = $arg_value ? 'true' : 'false';
                $arg_list[] = "'$arg_name' => $arg_value";
            }
        }

        $_params = "array('smarty_file' => " . $attrs['file'] . ", 'smarty_assign' => '$assign_var', 'smarty_once' => $once_var, 'smarty_include_vars' => array(".implode(',', $arg_list)."))";

        return "<?php require_once(SMARTY_CORE_DIR . 'core.smarty_include_php.php');\nsmarty_core_smarty_include_php($_params, \$this); ?>" . $this->_additional_newline;
    }


    /**
     * Compile {section ...} tag
     *
     * @param string $tag_args
     * @return string
     */
    function _compile_section_start($tag_args)
    {
        $attrs = $this->_parse_attrs($tag_args);
        $arg_list = array();

        $output = '<?php ';
        $section_name = $attrs['name'];
        if (empty($section_name)) {
            $this->_syntax_error("missing section name", E_USER_ERROR, __FILE__, __LINE__);
        }

        $output .= "unset(\$this->_sections[$section_name]);\n";
        $section_props = "\$this->_sections[$section_name]";

        foreach ($attrs as $attr_name => $attr_value) {
            switch ($attr_name) {
                case 'loop':
                    $output .= "{$section_props}['loop'] = is_array(\$_loop=$attr_value) ? count(\$_loop) : max(0, (int)\$_loop); unset(\$_loop);\n";
                    break;

                case 'show':
                    if (is_bool($attr_value))
                        $show_attr_value = $attr_value ? 'true' : 'false';
                    else
                        $show_attr_value = "(bool)$attr_value";
                    $output .= "{$section_props}['show'] = $show_attr_value;\n";
                    break;

                case 'name':
                    $output .= "{$section_props}['$attr_name'] = $attr_value;\n";
                    break;

                case 'max':
                case 'start':
                    $output .= "{$section_props}['$attr_name'] = (int)$attr_value;\n";
                    break;

                case 'step':
                    $output .= "{$section_props}['$attr_name'] = ((int)$attr_value) == 0 ? 1 : (int)$attr_value;\n";
                    break;

                default:
                    $this->_syntax_error("unknown section attribute - '$attr_name'", E_USER_ERROR, __FILE__, __LINE__);
                    break;
            }
        }

        if (!isset($attrs['show']))
            $output .= "{$section_props}['show'] = true;\n";

        if (!isset($attrs['loop']))
            $output .= "{$section_props}['loop'] = 1;\n";

        if (!isset($attrs['max']))
            $output .= "{$section_props}['max'] = {$section_props}['loop'];\n";
        else
            $output .= "if ({$section_props}['max'] < 0)\n" .
                       "    {$section_props}['max'] = {$section_props}['loop'];\n";

        if (!isset($attrs['step']))
            $output .= "{$section_props}['step'] = 1;\n";

        if (!isset($attrs['start']))
            $output .= "{$section_props}['start'] = {$section_props}['step'] > 0 ? 0 : {$section_props}['loop']-1;\n";
        else {
            $output .= "if ({$section_props}['start'] < 0)\n" .
                       "    {$section_props}['start'] = max({$section_props}['step'] > 0 ? 0 : -1, {$section_props}['loop'] + {$section_props}['start']);\n" .
                       "else\n" .
                       "    {$section_props}['start'] = min({$section_props}['start'], {$section_props}['step'] > 0 ? {$section_props}['loop'] : {$section_props}['loop']-1);\n";
        }

        $output .= "if ({$section_props}['show']) {\n";
        if (!isset($attrs['start']) && !isset($attrs['step']) && !isset($attrs['max'])) {
            $output .= "    {$section_props}['total'] = {$section_props}['loop'];\n";
        } else {
            $output .= "    {$section_props}['total'] = min(ceil(({$section_props}['step'] > 0 ? {$section_props}['loop'] - {$section_props}['start'] : {$section_props}['start']+1)/abs({$section_props}['step'])), {$section_props}['max']);\n";
        }
        $output .= "    if ({$section_props}['total'] == 0)\n" .
                   "        {$section_props}['show'] = false;\n" .
                   "} else\n" .
                   "    {$section_props}['total'] = 0;\n";

        $output .= "if ({$section_props}['show']):\n";
        $output .= "
            for ({$section_props}['index'] = {$section_props}['start'], {$section_props}['iteration'] = 1;
                 {$section_props}['iteration'] <= {$section_props}['total'];
                 {$section_props}['index'] += {$section_props}['step'], {$section_props}['iteration']++):\n";
        $output .= "{$section_props}['rownum'] = {$section_props}['iteration'];\n";
        $output .= "{$section_props}['index_prev'] = {$section_props}['index'] - {$section_props}['step'];\n";
        $output .= "{$section_props}['index_next'] = {$section_props}['index'] + {$section_props}['step'];\n";
        $output .= "{$section_props}['first']      = ({$section_props}['iteration'] == 1);\n";
        $output .= "{$section_props}['last']       = ({$section_props}['iteration'] == {$section_props}['total']);\n";

        $output .= "?>";

        return $output;
    }


    /**
     * Compile {foreach ...} tag.
     *
     * @param string $tag_args
     * @return string
     */
    function _compile_foreach_start($tag_args)
    {
        $attrs = $this->_parse_attrs($tag_args);
        $arg_list = array();

        if (empty($attrs['from'])) {
            return $this->_syntax_error("foreach: missing 'from' attribute", E_USER_ERROR, __FILE__, __LINE__);
        }
        $from = $attrs['from'];

        if (empty($attrs['item'])) {
            return $this->_syntax_error("foreach: missing 'item' attribute", E_USER_ERROR, __FILE__, __LINE__);
        }
        $item = $this->_dequote($attrs['item']);
        if (!preg_match('~^\w+$~', $item)) {
            return $this->_syntax_error("'foreach: item' must be a variable name (literal string)", E_USER_ERROR, __FILE__, __LINE__);
        }

        if (isset($attrs['key'])) {
            $key  = $this->_dequote($attrs['key']);
            if (!preg_match('~^\w+$~', $key)) {
                return $this->_syntax_error("foreach: 'key' must to be a variable name (literal string)", E_USER_ERROR, __FILE__, __LINE__);
            }
            $key_part = "\$this->_tpl_vars['$key'] => ";
        } else {
            $key = null;
            $key_part = '';
        }

        if (isset($attrs['name'])) {
            $name = $attrs['name'];
        } else {
            $name = null;
        }

        $output = '<?php ';
        $output .= "\$_from = $from; if (!is_array(\$_from) && !is_object(\$_from)) { settype(\$_from, 'array'); }";
        if (isset($name)) {
            $foreach_props = "\$this->_foreach[$name]";
            $output .= "{$foreach_props} = array('total' => count(\$_from), 'iteration' => 0);\n";
            $output .= "if ({$foreach_props}['total'] > 0):\n";
            $output .= "    foreach (\$_from as $key_part\$this->_tpl_vars['$item']):\n";
            $output .= "        {$foreach_props}['iteration']++;\n";
        } else {
            $output .= "if (count(\$_from)):\n";
            $output .= "    foreach (\$_from as $key_part\$this->_tpl_vars['$item']):\n";
        }
        $output .= '?>';

        return $output;
    }


    /**
     * Compile {capture} .. {/capture} tags
     *
     * @param boolean $start true if this is the {capture} tag
     * @param string $tag_args
     * @return string
     */

    function _compile_capture_tag($start, $tag_args = '')
    {
        $attrs = $this->_parse_attrs($tag_args);

        if ($start) {
            if (isset($attrs['name']))
                $buffer = $attrs['name'];
            else
                $buffer = "'default'";

            if (isset($attrs['assign']))
                $assign = $attrs['assign'];
            else
                $assign = null;
            $output = "<?php ob_start(); ?>";
            $this->_capture_stack[] = array($buffer, $assign);
        } else {
            list($buffer, $assign) = array_pop($this->_capture_stack);
            $output = "<?php \$this->_smarty_vars['capture'][$buffer] = ob_get_contents(); ";
            if (isset($assign)) {
                $output .= " \$this->assign($assign, ob_get_contents());";
            }
            $output .= "ob_end_clean(); ?>";
        }

        return $output;
    }

    /**
     * Compile {if ...} tag
     *
     * @param string $tag_args
     * @param boolean $elseif if true, uses elseif instead of if
     * @return string
     */
    function _compile_if_tag($tag_args, $elseif = false)
    {

        /* Tokenize args for 'if' tag. */
        preg_match_all('~(?>
                ' . $this->_obj_call_regexp . '(?:' . $this->_mod_regexp . '*)? | # valid object call
                ' . $this->_var_regexp . '(?:' . $this->_mod_regexp . '*)?    | # var or quoted string
                \-?0[xX][0-9a-fA-F]+|\-?\d+(?:\.\d+)?|\.\d+|!==|===|==|!=|<>|<<|>>|<=|>=|\&\&|\|\||\(|\)|,|\!|\^|=|\&|\~|<|>|\||\%|\+|\-|\/|\*|\@    | # valid non-word token
                \b\w+\b                                                        | # valid word token
                \S+                                                           # anything else
                )~x', $tag_args, $match);

        $tokens = $match[0];

        if(empty($tokens)) {
            $_error_msg .= $elseif ? "'elseif'" : "'if'";
            $_error_msg .= ' statement requires arguments'; 
            $this->_syntax_error($_error_msg, E_USER_ERROR, __FILE__, __LINE__);
        }
            
                
        // make sure we have balanced parenthesis
        $token_count = array_count_values($tokens);
        if(isset($token_count['(']) && $token_count['('] != $token_count[')']) {
            $this->_syntax_error("unbalanced parenthesis in if statement", E_USER_ERROR, __FILE__, __LINE__);
        }

        $is_arg_stack = array();

        for ($i = 0; $i < count($tokens); $i++) {

            $token = &$tokens[$i];

            switch (strtolower($token)) {
                case '!':
                case '%':