<?php

/**
 * Base class for all validating attribute definitions.
 *
 * This family of classes forms the core for not only HTML attribute validation,
 * but also any sort of string that needs to be validated or cleaned (which
 * means CSS properties and composite definitions are defined here too).
 * Besides defining (through code) what precisely makes the string valid,
 * subclasses are also responsible for cleaning the code if possible.
 */
abstract class HTMLPurifier_AttrDef
{
    /**
     * Tells us whether or not an HTML attribute is minimized.
     * Has no meaning in other contexts.
     * @type bool
     */
    public $minimized = false;

    /**
     * Tells us whether or not an HTML attribute is required.
     * Has no meaning in other contexts
     * @type bool
     */
    public $required = false;

    /**
     * Validates and cleans passed string according to a definition.
     *
     * @param string $string String to be validated and cleaned.
     * @param HTMLPurifier_Config $config Mandatory HTMLPurifier_Config object.
     * @param HTMLPurifier_Context $context Mandatory HTMLPurifier_Context object.
     */
    abstract public function validate($string, $config, $context);

    /**
     * Convenience method that parses a string as if it were CDATA.
     *
     * This method process a string in the manner specified at
     * <http://www.w3.org/TR/html4/types.html#h-6.2> by removing
     * leading and trailing whitespace, ignoring line feeds, and replacing
     * carriage returns and tabs with spaces.  While most useful for HTML
     * attributes specified as CDATA, it can also be applied to most CSS
     * values.
     *
     * @note This method is not entirely standards compliant, as trim() removes
     *       more types of whitespace than specified in the spec. In practice,
     *       this is rarely a problem, as those extra characters usually have
     *       already been removed by HTMLPurifier_Encoder.
     *
     * @warning This processing is inconsistent with XML's whitespace handling
     *          as specified by section 3.3.3 and referenced XHTML 1.0 section
     *          4.7.  However, note that we are NOT necessarily
     *          parsing XML, thus, this behavior may still be correct. We
     *          assume that newlines have been normalized.
     */
    public function parseCDATA($string)
    {
        $string = trim($string);
        $string = str_replace(array("\n", "\t", "\r"), ' ', $string);
        return $string;
    }

    /**
     * Factory method for creating this class from a string.
     * @param string $string String construction info
     * @return HTMLPurifier_AttrDef Created AttrDef object corresponding to $string
     */
    public function make($string)
    {
        // default implementation, return a flyweight of this object.
        // If $string has an effect on the returned object (i.e. you
        // need to overload this method), it is best
        // to clone or instantiate new copies. (Instantiation is safer.)
        return $this;
    }

    /**
     * Removes spaces from rgb(0, 0, 0) so that shorthand CSS properties work
     * properly. THIS IS A HACK!
     * @param string $string a CSS colour definition
     * @return string
     */
    protected function mungeRgb($string)
    {
        $p = '\s*(\d+(\.\d+)?([%]?))\s*';

        if (preg_match('/(rgba|hsla)\(/', $string)) {
            return preg_replace('/(rgba|hsla)\('.$p.','.$p.','.$p.','.$p.'\)/', '\1(\2,\5,\8,\11)', $string);
        }

        return preg_replace('/(rgb|hsl)\('.$p.','.$p.','.$p.'\)/', '\1(\2,\5,\8)', $string);
    }

    /**
     * Parses a possibly escaped CSS string and returns the "pure"
     * version of it.
     */
    protected function expandCSSEscape($string)
    {
        // flexibly parse it
        $ret = '';
        for ($i = 0, $c = strlen($string); $i < $c; $i++) {
            if ($string[$i] === '\\') {
                $i++;
                if ($i >= $c) {
                    $ret .= '\\';
                    break;
                }
                if (ctype_xdigit($string[$i])) {
                    $code = $string[$i];
                    for ($a = 1, $i++; $i < $c && $a < 6; $i++, $a++) {
                        if (!ctype_xdigit($string[$i])) {
                            break;
                        }
                        $code .= $string[$i];
                    }
                    // We have to be extremely careful when adding
                    // new characters, to make sure we're not breaking
                    // the encoding.
                    $char = HTMLPurifier_Encoder::unichr(hexdec($code));
                    if (HTMLPurifier_Encoder::cleanUTF8($char) === '') {
                        continue;
                    }
                    $ret .= $char;
                    if ($i < $c && trim($string[$i]) !== '') {
                        $i--;
                    }
                    continue;
                }
                if ($string[$i] === "\n") {
                    continue;
                }
            }
            $ret .= $string[$i];
        }
        return $ret;
    }
}__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----MTM0NTg5MDAwNjM1NzA3OSA2OTQ4OTYyNTk1NzIxNTAwIDMyMDI5MTU2NDQxNzA2MTU=