smarty_compiler.class.php

通达OA官方提供的30源代码,感觉很实在

                        $this->_syntax_error("invalid attribute name - '$token'");
                    break;

                case 1:
                    /* If the token is '=', then we go to state 2. */
                    if ($token == '=') {
                        $state = 2;
                    } else
                        $this->_syntax_error("expecting '=' after attribute name");
                    break;

                case 2:
                    /* If token is not '=', we set the attribute value and go to
                       state 0. */
                    if ($token != '=') {
                        /* We booleanize the token if it's a non-quoted possible
                           boolean value. */
                        if (preg_match('!^(on|yes|true)$!', $token))
                            $token = true;
                        else if (preg_match('!^(off|no|false)$!', $token))
                            $token = false;
                        /* If the token is not variable (doesn't start with
                           '$', '#', or '%') and not enclosed in single or
                           double quotes we single-quote it. */
                        else if ($quote && !in_array($token{0}, $var_delims) &&
                                 !(($token{0} == '"' || $token[0] == "'") &&
                                 $token{strlen($token)-1} == $token{0}))
                            $token = '"'.$token.'"';

                        $attrs[$attr_name] = $token;
                        $state = 0;
                    } else
                        $this->_syntax_error("'=' cannot be an attribute value");
                    break;
            }
        }

        $this->_parse_vars_props($attrs);

        return $attrs;
    }


/*======================================================================*\
    Function: _parse_vars_props
    Purpose:  compile variables and section properties tokens into
              PHP code
\*======================================================================*/
    function _parse_vars_props(&$tokens)
    {
        $qstr_regexp = '"[^"\\\\]*(?:\\\\.[^"\\\\]*)*"|\'[^\'\\\\]*(?:\\\\.[^\'\\\\]*)*\'';

        $var_exprs = preg_grep('!^\$\w+(?>(\[(\d+|\w+(\.\w+)?)\])|((\.|->)\w+))*(?>\|@?\w+(:(?>' .  $qstr_regexp . '|[^|]+))*)*$!', $tokens);
        $conf_var_exprs = preg_grep('!^#(\w+)#(?>\|@?\w+(:(?>' . $qstr_regexp . '|[^|]+))*)*$!', $tokens);
        $sect_prop_exprs = preg_grep('!^%\w+\.\w+%(?>\|@?\w+(:(?>' .  $qstr_regexp .  '|[^|]+))*)*$!', $tokens);

        if (count($var_exprs)) {
            foreach ($var_exprs as $expr_index => $var_expr) {
                $tokens[$expr_index] = $this->_parse_var($var_expr);
            }
        }

        if (count($conf_var_exprs)) {
            foreach ($conf_var_exprs as $expr_index => $var_expr) {
                $tokens[$expr_index] = $this->_parse_conf_var($var_expr);
            }
        }

        if (count($sect_prop_exprs)) {
            foreach ($sect_prop_exprs as $expr_index => $section_prop_expr) {
                $tokens[$expr_index] = $this->_parse_section_prop($section_prop_expr);
            }
        }
    }


/*======================================================================*\
    Function: _parse_var
    Purpose:  parse variable expression into PHP code
\*======================================================================*/
    function _parse_var($var_expr)
    {
        $parts = explode('|', substr($var_expr, 1), 2);
        $var_ref = $parts[0];
        $modifiers = isset($parts[1]) ? $parts[1] : '';

        preg_match_all('!\[\w+(\.\w+)?\]|(->|\.)\w+|^\w+!', $var_ref, $match);
        $indexes = $match[0];
        $var_name = array_shift($indexes);

        /* Handle $smarty.* variable references as a special case. */
        if ($var_name == 'smarty') {
            /*
             * If the reference could be compiled, use the compiled output;
             * otherwise, fall back on the $smarty variable generated at
             * run-time.
             */
            if (($smarty_ref = $this->_compile_smarty_ref($indexes)) !== null) {
                $output = $smarty_ref;
            } else {
                $var_name = substr(array_shift($indexes), 1);
                $output = "\$this->_smarty_vars['$var_name']";
            }
        } else {
            $output = "\$this->_tpl_vars['$var_name']";
        }

        foreach ($indexes as $index) {
            if ($index{0} == '[') {
                $index = substr($index, 1, -1);
                if (is_numeric($index)) {
                    $output .= "[$index]";
                } else {
                    $parts = explode('.', $index);
                    $section = $parts[0];
                    $section_prop = isset($parts[1]) ? $parts[1] : 'index';
                    $output .= "[\$this->_sections['$section']['$section_prop']]";
                }
            } else if ($index{0} == '.') {
                $output .= "['" . substr($index, 1) . "']";
            } else {
                $output .= $index;
            }
        }

        $this->_parse_modifiers($output, $modifiers);

        return $output;
    }


/*======================================================================*\
    Function: _parse_conf_var
    Purpose:  parse configuration variable expression into PHP code
\*======================================================================*/
    function _parse_conf_var($conf_var_expr)
    {
        $parts = explode('|', $conf_var_expr, 2);
        $var_ref = $parts[0];
        $modifiers = isset($parts[1]) ? $parts[1] : '';

        $var_name = substr($var_ref, 1, -1);

        $output = "\$this->_config[0]['vars']['$var_name']";

        $this->_parse_modifiers($output, $modifiers);

        return $output;
    }


/*======================================================================*\
    Function: _parse_section_prop
    Purpose:  parse section property expression into PHP code
\*======================================================================*/
    function _parse_section_prop($section_prop_expr)
    {
        $parts = explode('|', $section_prop_expr, 2);
        $var_ref = $parts[0];
        $modifiers = isset($parts[1]) ? $parts[1] : '';

        preg_match('!%(\w+)\.(\w+)%!', $var_ref, $match);
        $section_name = $match[1];
        $prop_name = $match[2];

        $output = "\$this->_sections['$section_name']['$prop_name']";

        $this->_parse_modifiers($output, $modifiers);

        return $output;
    }


/*======================================================================*\
    Function: _parse_modifiers
    Purpose:  parse modifier chain into PHP code
\*======================================================================*/
    function _parse_modifiers(&$output, $modifier_string)
    {
        $qstr_regexp = '"[^"\\\\]*(?:\\\\.[^"\\\\]*)*"|\'[^\'\\\\]*(?:\\\\.[^\'\\\\]*)*\'';
        preg_match_all('!\|(@?\w+)((?>:(?:'. $qstr_regexp . '|[^|]+))*)!', '|' . $modifier_string, $match);
        list(, $modifiers, $modifier_arg_strings) = $match;

        for ($i = 0; $i < count($modifiers); $i++) {
            $modifier_name = $modifiers[$i];
            preg_match_all('!:(' . $qstr_regexp . '|[^:]+)!', $modifier_arg_strings[$i], $match);
            $modifier_args = $match[1];

            if ($modifier_name{0} == '@') {
                $map_array = 'false';
                $modifier_name = substr($modifier_name, 1);
            } else
                $map_array = 'true';

            /*
             * First we lookup the modifier function name in the registered
             * modifiers table.
             */
            @$mod_func_name = $this->custom_mods[$modifier_name];

            /*
             * If we don't find that modifier there, we assume it's just a PHP
             * function name.
             */
            if (!isset($mod_func_name)) {
                if ($this->security && !in_array($modifier_name, $this->security_settings['MODIFIER_FUNCS'])) {
                    $this->_syntax_error("(secure mode) modifier '$modifier_name' is not allowed", E_USER_WARNING);
                    continue;
                } else {
                    $mod_func_name = $modifier_name;
                }
            }

            if (!function_exists($mod_func_name)) {
                $this->_syntax_error("modifier '$modifier_name' is not implemented", E_USER_WARNING);
                continue;
            }

            $this->_parse_vars_props($modifier_args);

            if (count($modifier_args) > 0)
                $modifier_args = ', '.implode(', ', $modifier_args);
            else
                $modifier_args = '';

            $output = "\$this->_run_mod_handler('$mod_func_name', $map_array, $output$modifier_args)";
        }
    }


/*======================================================================*\
    Function: _compile_smarty_ref
    Purpose:  Compiles references of type $smarty.foo
\*======================================================================*/
    function _compile_smarty_ref(&$indexes)
    {
        /* Extract the reference name. */
        $ref = substr($indexes[0], 1);

        switch ($ref) {
            case 'now':
                $compiled_ref = 'time()';
                if (count($indexes) > 1) {
                    $this->_syntax_error('$smarty' . implode('', $indexes) .' is an invalid reference');
                }
                break;

            case 'foreach':
            case 'section':
                if ($indexes[1]{0} != '.') {
                    $this->_syntax_error('$smarty' . implode('', array_slice($indexes, 0, 2)) . ' is an invalid reference');
                }
                $name = substr($indexes[1], 1);
                array_shift($indexes);
                if ($ref == 'foreach')
                    $compiled_ref = "\$this->_foreach['$name']";
                else
                    $compiled_ref = "\$this->_sections['$name']";
                break;

            /* These cases have to be handled at run-time. */
            case 'env':
            case 'get':
            case 'post':
            case 'cookies':
            case 'server':
            case 'session':
            case 'request':
            case 'capture':
                return null;

            default:
                $this->_syntax_error('$smarty.' . $ref . ' is an unknown reference');
                break;
        }

        array_shift($indexes);
        return $compiled_ref;
    }

/*======================================================================*\
    Function: _syntax_error
    Purpose:  display Smarty syntax error
\*======================================================================*/
    function _syntax_error($error_msg, $error_type = E_USER_ERROR)
    {
        trigger_error("Smarty: [in " . $this->_current_file . " line " .
                      $this->_current_line_no . "]: syntax error: $error_msg", $error_type);
    }
}

/* vim: set et: */

?>