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Description

Extracts @import and @charset rules from the supplied CSS. These rules must not be preceded by any other rules, or they will be ignored. (From the CSS 2.1 specification: "CSS 2.1 user agents must ignore any '@import' rule that occurs inside a block or after any non-ignored statement other than an @charset or an @import rule." Note also that @charset is case sensitive whereas @import is not.)

Usage

$string[] = CssInliner::extractImportAndCharsetRules( $css );

Parameters

$css

( string ) required – CSS with comments removed

Returns

string[] The first element is the CSS with the valid @import and @charset rules removed. The second element contains a concatenation of the valid @import rules, each followed by whatever whitespace followed it in the original CSS (so that either unminified or minified formatting is preserved); if there were no @import rules, it will be an empty string. The (valid) @charset rules are discarded.

Source

File name: woocommerce/vendor/pelago/emogrifier/src/Emogrifier/CssInliner.php
Lines:

    private function extractImportAndCharsetRules($css)
    {
        $possiblyModifiedCss = $css;
        $importRules = '';

        while (
            \preg_match(
                '/^\\s*+(@((?i)import(?-i)|charset)\\s[^;]++;\\s*+)/',
                $possiblyModifiedCss,
                $matches
            )
        ) {
            list($fullMatch, $atRuleAndFollowingWhitespace, $atRuleName) = $matches;

            if (\strtolower($atRuleName) === 'import') {
                $importRules .= $atRuleAndFollowingWhitespace;
            }

            $possiblyModifiedCss = \substr($possiblyModifiedCss, \strlen($fullMatch));
        }

        return [$possiblyModifiedCss, $importRules];
    }
 

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