library/smarty/libs/sysplugins/smarty_internal_compilebase.php
author Markus Bröker<broeker.markus@googlemail.com>
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<?php
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/**
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 * Smarty Internal Plugin CompileBase
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 *
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 * @package    Smarty
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 * @subpackage Compiler
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 * @author     Uwe Tews
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 */
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/**
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 * This class does extend all internal compile plugins
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 *
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 * @package    Smarty
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 * @subpackage Compiler
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 */
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abstract class Smarty_Internal_CompileBase {
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    /**
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     * Array of names of required attribute required by tag
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     *
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     * @var array
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     */
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    public $required_attributes = array();
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    /**
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     * Array of names of optional attribute required by tag
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     * use array('_any') if there is no restriction of attributes names
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     *
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     * @var array
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     */
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    public $optional_attributes = array();
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    /**
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     * Shorttag attribute order defined by its names
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     *
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     * @var array
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     */
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    public $shorttag_order = array();
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    /**
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     * Array of names of valid option flags
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     *
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     * @var array
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     */
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    public $option_flags = array('nocache');
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    /**
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     * This function checks if the attributes passed are valid
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     * The attributes passed for the tag to compile are checked against the list of required and
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     * optional attributes. Required attributes must be present. Optional attributes are check against
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     * the corresponding list. The keyword '_any' specifies that any attribute will be accepted
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     * as valid
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     *
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     * @param  object $compiler compiler object
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     * @param  array $attributes attributes applied to the tag
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     *
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     * @return array  of mapped attributes for further processing
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     */
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    public function getAttributes($compiler, $attributes) {
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        $_indexed_attr = array();
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        // loop over attributes
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        foreach ($attributes as $key => $mixed) {
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            // shorthand ?
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            if (!is_array($mixed)) {
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                // option flag ?
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                if (in_array(trim($mixed, '\'"'), $this->option_flags)) {
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                    $_indexed_attr[trim($mixed, '\'"')] = true;
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                    // shorthand attribute ?
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                } elseif (isset($this->shorttag_order[$key])) {
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                    $_indexed_attr[$this->shorttag_order[$key]] = $mixed;
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                } else {
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                    // too many shorthands
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                    $compiler->trigger_template_error('too many shorthand attributes', $compiler->lex->taglineno);
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                }
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                // named attribute
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            } else {
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                $kv = each($mixed);
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                // option flag?
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                if (in_array($kv['key'], $this->option_flags)) {
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                    if (is_bool($kv['value'])) {
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                        $_indexed_attr[$kv['key']] = $kv['value'];
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                    } elseif (is_string($kv['value']) && in_array(trim($kv['value'], '\'"'), array('true', 'false'))) {
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                        if (trim($kv['value']) == 'true') {
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                            $_indexed_attr[$kv['key']] = true;
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                        } else {
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                            $_indexed_attr[$kv['key']] = false;
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                        }
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                    } elseif (is_numeric($kv['value']) && in_array($kv['value'], array(0, 1))) {
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                        if ($kv['value'] == 1) {
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                            $_indexed_attr[$kv['key']] = true;
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                        } else {
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                            $_indexed_attr[$kv['key']] = false;
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                        }
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                    } else {
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                        $compiler->trigger_template_error("illegal value of option flag \"{$kv['key']}\"", $compiler->lex->taglineno);
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                    }
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                    // must be named attribute
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                } else {
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                    reset($mixed);
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                    $_indexed_attr[key($mixed)] = $mixed[key($mixed)];
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                }
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            }
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        }
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        // check if all required attributes present
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        foreach ($this->required_attributes as $attr) {
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            if (!array_key_exists($attr, $_indexed_attr)) {
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                $compiler->trigger_template_error("missing \"" . $attr . "\" attribute", $compiler->lex->taglineno);
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            }
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        }
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        // check for not allowed attributes
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        if ($this->optional_attributes != array('_any')) {
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            $tmp_array = array_merge($this->required_attributes, $this->optional_attributes, $this->option_flags);
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            foreach ($_indexed_attr as $key => $dummy) {
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                if (!in_array($key, $tmp_array) && $key !== 0) {
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                    $compiler->trigger_template_error("unexpected \"" . $key . "\" attribute", $compiler->lex->taglineno);
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                }
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            }
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        }
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        // default 'false' for all option flags not set
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        foreach ($this->option_flags as $flag) {
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            if (!isset($_indexed_attr[$flag])) {
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                $_indexed_attr[$flag] = false;
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            }
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        }
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        return $_indexed_attr;
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    }
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    /**
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     * Push opening tag name on stack
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     * Optionally additional data can be saved on stack
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     *
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     * @param object $compiler compiler object
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     * @param string $openTag the opening tag's name
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     * @param mixed $data optional data saved
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     */
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    public function openTag($compiler, $openTag, $data = null) {
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        array_push($compiler->_tag_stack, array($openTag, $data));
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    }
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    /**
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     * Pop closing tag
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     * Raise an error if this stack-top doesn't match with expected opening tags
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     *
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     * @param  object $compiler compiler object
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     * @param  array|string $expectedTag the expected opening tag names
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     *
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     * @return mixed        any type the opening tag's name or saved data
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     */
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    public function closeTag($compiler, $expectedTag) {
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        if (count($compiler->_tag_stack) > 0) {
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            // get stacked info
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            list($_openTag, $_data) = array_pop($compiler->_tag_stack);
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            // open tag must match with the expected ones
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            if (in_array($_openTag, (array)$expectedTag)) {
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                if (is_null($_data)) {
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                    // return opening tag
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                    return $_openTag;
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                } else {
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                    // return restored data
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                    return $_data;
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                }
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            }
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            // wrong nesting of tags
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            $compiler->trigger_template_error("unclosed {$compiler->smarty->left_delimiter}" . $_openTag . "{$compiler->smarty->right_delimiter} tag");
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            return;
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        }
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        // wrong nesting of tags
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        $compiler->trigger_template_error("unexpected closing tag", $compiler->lex->taglineno);
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        return;
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    }
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}