<?php

/**
 * Validates based on {ident} CSS grammar production
 */
class HTMLPurifier_AttrDef_CSS_Ident extends HTMLPurifier_AttrDef
{

    /**
     * @param string $string
     * @param HTMLPurifier_Config $config
     * @param HTMLPurifier_Context $context
     * @return bool|string
     */
    public function validate($string, $config, $context)
    {
        $string = trim($string);

        // early abort: '' and '0' (strings that convert to false) are invalid
        if (!$string) {
            return false;
        }

        $pattern = '/^(-?[A-Za-z_][A-Za-z_\-0-9]*)$/';
        if (!preg_match($pattern, $string)) {
            return false;
        }
        return $string;
    }
}

// vim: et sw=4 sts=4

• [F] AlphaValue.php
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• [F] Background.php
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• [F] BackgroundPosition.php
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• [F] Border.php
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• [F] Color.php
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• [F] Composite.php
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• [F] DenyElementDecorator.php
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• [F] Filter.php
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• [F] Font.php
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• [F] FontFamily.php
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• [F] Ident.php
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• [F] ImportantDecorator.php
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• [F] Length.php
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• [F] ListStyle.php
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• [F] Multiple.php
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• [F] Number.php
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• [F] Percentage.php
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• [F] TextDecoration.php
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• [F] URI.php
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