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<?php
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/**
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 * Validates the HTML attribute ID.
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 * @warning Even though this is the id processor, it
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 *          will ignore the directive Attr:IDBlacklist, since it will only
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 *          go according to the ID accumulator. Since the accumulator is
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 *          automatically generated, it will have already absorbed the
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 *          blacklist. If you're hacking around, make sure you use load()!
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 */
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class HTMLPurifier_AttrDef_HTML_ID extends HTMLPurifier_AttrDef
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{
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    // selector is NOT a valid thing to use for IDREFs, because IDREFs
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    // *must* target IDs that exist, whereas selector #ids do not.
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    /**
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     * Determines whether or not we're validating an ID in a CSS
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     * selector context.
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     * @type bool
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     */
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    protected $selector;
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    /**
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     * @param bool $selector
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     */
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    public function __construct($selector = false)
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    {
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        $this->selector = $selector;
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    }
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    /**
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     * @param string $id
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     * @param HTMLPurifier_Config $config
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     * @param HTMLPurifier_Context $context
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     * @return bool|string
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     */
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    public function validate($id, $config, $context)
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    {
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        if (!$this->selector && !$config->get('Attr.EnableID')) {
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            return false;
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        }
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        $id = trim($id); // trim it first
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        if ($id === '') {
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            return false;
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        }
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        $prefix = $config->get('Attr.IDPrefix');
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        if ($prefix !== '') {
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            $prefix .= $config->get('Attr.IDPrefixLocal');
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            // prevent re-appending the prefix
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            if (strpos($id, $prefix) !== 0) {
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                $id = $prefix . $id;
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            }
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        } elseif ($config->get('Attr.IDPrefixLocal') !== '') {
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            trigger_error(
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                '%Attr.IDPrefixLocal cannot be used unless ' .
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                '%Attr.IDPrefix is set',
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                E_USER_WARNING
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            );
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        }
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        if (!$this->selector) {
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            $id_accumulator =& $context->get('IDAccumulator');
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            if (isset($id_accumulator->ids[$id])) {
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                return false;
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            }
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        }
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        // we purposely avoid using regex, hopefully this is faster
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        if ($config->get('Attr.ID.HTML5') === true) {
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            if (preg_match('/[\t\n\x0b\x0c ]/', $id)) {
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                return false;
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            }
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        } else {
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            if (ctype_alpha($id)) {
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                // OK
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            } else {
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                if (!ctype_alpha(@$id[0])) {
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                    return false;
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                }
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                // primitive style of regexps, I suppose
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                $trim = trim(
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                    $id,
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                    'A..Za..z0..9:-._'
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                );
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                if ($trim !== '') {
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                    return false;
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                }
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            }
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        }
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        $regexp = $config->get('Attr.IDBlacklistRegexp');
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        if ($regexp && preg_match($regexp, $id)) {
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            return false;
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        }
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        if (!$this->selector) {
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            $id_accumulator->add($id);
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        }
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        // if no change was made to the ID, return the result
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        // else, return the new id if stripping whitespace made it
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        //     valid, or return false.
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        return $id;
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    }
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}
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// vim: et sw=4 sts=4