smarty_compiler.class.php

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            case 'insert':
                return $this->_compile_insert_tag($tag_args);

            default:
                if (isset($this->compiler_funcs[$tag_command])) {
                    return $this->_compile_compiler_tag($tag_command, $tag_args);
                } else if (isset($this->custom_funcs[$tag_command])) {
                    return $this->_compile_custom_tag($tag_command, $tag_args);
                } else {
                    $this->_syntax_error("unknown tag - '$tag_command'", E_USER_WARNING);
                    return;
                }
        }
    }


/*======================================================================*\
    Function: _compile_compiler_tag
    Purpose:  compile the custom compiler tag
\*======================================================================*/
    function _compile_compiler_tag($tag_command, $tag_args)
    {
        $function = $this->compiler_funcs[$tag_command];

        if (!function_exists($function)) {
            $this->_syntax_error("compiler function '$tag_command' is not implemented", E_USER_WARNING);
            return;
        }

        return '<?php ' . $function($tag_args, $this) . ' ?>';
    }


/*======================================================================*\
    Function: _compile_custom_tag
    Purpose:  compile custom function tag
\*======================================================================*/
    function _compile_custom_tag($tag_command, $tag_args)
    {
        $function = $this->custom_funcs[$tag_command];

        if (!function_exists($function)) {
            $this->_syntax_error("custom function '$tag_command' is not implemented", E_USER_WARNING);
            return;
        }

        $arg_list = array();
        $attrs = $this->_parse_attrs($tag_args);
        foreach ($attrs as $arg_name => $arg_value) {
            if (is_bool($arg_value))
                $arg_value = $arg_value ? 'true' : 'false';
            $arg_list[] = "'$arg_name' => $arg_value";
        }

        return "<?php $function(array(".implode(',', (array)$arg_list)."), \$this); if(\$this->_extract) { extract(\$this->_tpl_vars); \$this->_extract=false; } ?>";
    }


/*======================================================================*\
    Function: _compile_insert_tag
    Purpose:  Compile {insert ...} tag
\*======================================================================*/
    function _compile_insert_tag($tag_args)
    {
        $attrs = $this->_parse_attrs($tag_args);
        $name = substr($attrs['name'], 1, -1);

        if (empty($name)) {
            $this->_syntax_error("missing insert name");
        }

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

        return "<?php echo \$this->_run_insert_handler(array(".implode(', ', (array)$arg_list).")); ?>\n";
    }


/*======================================================================*\
    Function: _compile_config_load_tag
    Purpose:  Compile {config_load ...} tag
\*======================================================================*/
    function _compile_config_load_tag($tag_args)
    {
        $attrs = $this->_parse_attrs($tag_args);

        if (empty($attrs['file'])) {
            $this->_syntax_error("missing 'file' attribute in config_load tag");
        }

        if (empty($attrs['section'])) {
            $attrs['section'] = 'null';
        }

        $scope = @$this->_dequote($attrs['scope']);
        if (!empty($scope)) {
            if ($scope != 'local' &&
                $scope != 'parent' &&
                $scope != 'global') {
                $this->_syntax_error("invalid 'scope' attribute value");
            }
        } else {
            if (!empty($attrs['global']) && $attrs['global'])
                $scope = 'parent';
            else
                $scope = 'local';
        }

        $output  = '<?php $this->_config_load(' . $attrs['file'] . ', ' . $attrs['section'] . ", '$scope'); ?>";

        return $output;
    }


/*======================================================================*\
    Function: _compile_include_tag
    Purpose:  Compile {include ...} tag
\*======================================================================*/
    function _compile_include_tag($tag_args)
    {
        $attrs = $this->_parse_attrs($tag_args);
        $arg_list = array();

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

        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";
        }

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

    }

/*======================================================================*\
    Function: _compile_include_php_tag
    Purpose:  Compile {include ...} tag
\*======================================================================*/
    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");
			return false;
        }
		
		$this->_parse_file_path($this->trusted_dir, $this->_dequote($attrs['file']), $resource_type, $resource_name);
		
		if ($this->security) {
			if( $resource_type != 'file' || !@is_file($resource_name)) {
            	$this->_syntax_error("include_php: $resource_type: $resource_name is not readable");
				return false;
			}
			if (!$this->_is_trusted($resource_type, $resource_name)) {
            	$this->_syntax_error("include_php: $resource_type: $resource_name is not trusted");
				return false;
        	}
		}
		
        if (!empty($attrs['assign'])) {
			$output = "<?php ob_start();\n";
			$output .= "include('" . $resource_name . "');\n";
			$output .= "\$this->assign(" . $this->_dequote($attrs['assign']).", ob_get_contents()); ob_end_clean();\n?>";
		} else {
        	$output =  "<?php include('" . $resource_name . "'); ?>";
		}

		return $output;
    }
	

/*======================================================================*\
    Function: _compile_section_start
    Purpose:  Compile {section ...} tag
\*======================================================================*/
    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");
        }

        $output .= "if (isset(\$this->_sections[$section_name])) 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($attr_value) ? count($attr_value) : max(0, (int)$attr_value);\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'");
                    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" .
                   "    {$section_props}['total'] = min(ceil(({$section_props}['step'] > 0 ? {$section_props}['loop'] - {$section_props}['start'] : {$section_props}['start']+1)/abs({$section_props}['step'])), {$section_props}['max']);\n" .
                   "    if ({$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 .= "?>";