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+'use strict';
+
+const EOF = 0;
+
+// https://drafts.csswg.org/css-syntax-3/
+// § 4.2. Definitions
+
+// digit
+// A code point between U+0030 DIGIT ZERO (0) and U+0039 DIGIT NINE (9).
+function isDigit(code) {
+    return code >= 0x0030 && code <= 0x0039;
+}
+
+// hex digit
+// A digit, or a code point between U+0041 LATIN CAPITAL LETTER A (A) and U+0046 LATIN CAPITAL LETTER F (F),
+// or a code point between U+0061 LATIN SMALL LETTER A (a) and U+0066 LATIN SMALL LETTER F (f).
+function isHexDigit(code) {
+    return (
+        isDigit(code) || // 0 .. 9
+        (code >= 0x0041 && code <= 0x0046) || // A .. F
+        (code >= 0x0061 && code <= 0x0066)    // a .. f
+    );
+}
+
+// uppercase letter
+// A code point between U+0041 LATIN CAPITAL LETTER A (A) and U+005A LATIN CAPITAL LETTER Z (Z).
+function isUppercaseLetter(code) {
+    return code >= 0x0041 && code <= 0x005A;
+}
+
+// lowercase letter
+// A code point between U+0061 LATIN SMALL LETTER A (a) and U+007A LATIN SMALL LETTER Z (z).
+function isLowercaseLetter(code) {
+    return code >= 0x0061 && code <= 0x007A;
+}
+
+// letter
+// An uppercase letter or a lowercase letter.
+function isLetter(code) {
+    return isUppercaseLetter(code) || isLowercaseLetter(code);
+}
+
+// non-ASCII code point
+// A code point with a value equal to or greater than U+0080 <control>.
+//
+// 2024-09-02: The latest spec narrows the range for non-ASCII characters (see https://github.com/csstree/csstree/issues/188).
+// However, all modern browsers support a wider range, and strictly following the latest spec could result
+// in some CSS being parsed incorrectly, even though it works in the browser. Therefore, this function adheres
+// to the previous, broader definition of non-ASCII characters.
+function isNonAscii(code) {
+    return code >= 0x0080;
+}
+
+// name-start code point
+// A letter, a non-ASCII code point, or U+005F LOW LINE (_).
+function isNameStart(code) {
+    return isLetter(code) || isNonAscii(code) || code === 0x005F;
+}
+
+// name code point
+// A name-start code point, a digit, or U+002D HYPHEN-MINUS (-).
+function isName(code) {
+    return isNameStart(code) || isDigit(code) || code === 0x002D;
+}
+
+// non-printable code point
+// A code point between U+0000 NULL and U+0008 BACKSPACE, or U+000B LINE TABULATION,
+// or a code point between U+000E SHIFT OUT and U+001F INFORMATION SEPARATOR ONE, or U+007F DELETE.
+function isNonPrintable(code) {
+    return (
+        (code >= 0x0000 && code <= 0x0008) ||
+        (code === 0x000B) ||
+        (code >= 0x000E && code <= 0x001F) ||
+        (code === 0x007F)
+    );
+}
+
+// newline
+// U+000A LINE FEED. Note that U+000D CARRIAGE RETURN and U+000C FORM FEED are not included in this definition,
+// as they are converted to U+000A LINE FEED during preprocessing.
+// TODO: we doesn't do a preprocessing, so check a code point for U+000D CARRIAGE RETURN and U+000C FORM FEED
+function isNewline(code) {
+    return code === 0x000A || code === 0x000D || code === 0x000C;
+}
+
+// whitespace
+// A newline, U+0009 CHARACTER TABULATION, or U+0020 SPACE.
+function isWhiteSpace(code) {
+    return isNewline(code) || code === 0x0020 || code === 0x0009;
+}
+
+// § 4.3.8. Check if two code points are a valid escape
+function isValidEscape(first, second) {
+    // If the first code point is not U+005C REVERSE SOLIDUS (\), return false.
+    if (first !== 0x005C) {
+        return false;
+    }
+
+    // Otherwise, if the second code point is a newline or EOF, return false.
+    if (isNewline(second) || second === EOF) {
+        return false;
+    }
+
+    // Otherwise, return true.
+    return true;
+}
+
+// § 4.3.9. Check if three code points would start an identifier
+function isIdentifierStart(first, second, third) {
+    // Look at the first code point:
+
+    // U+002D HYPHEN-MINUS
+    if (first === 0x002D) {
+        // If the second code point is a name-start code point or a U+002D HYPHEN-MINUS,
+        // or the second and third code points are a valid escape, return true. Otherwise, return false.
+        return (
+            isNameStart(second) ||
+            second === 0x002D ||
+            isValidEscape(second, third)
+        );
+    }
+
+    // name-start code point
+    if (isNameStart(first)) {
+        // Return true.
+        return true;
+    }
+
+    // U+005C REVERSE SOLIDUS (\)
+    if (first === 0x005C) {
+        // If the first and second code points are a valid escape, return true. Otherwise, return false.
+        return isValidEscape(first, second);
+    }
+
+    // anything else
+    // Return false.
+    return false;
+}
+
+// § 4.3.10. Check if three code points would start a number
+function isNumberStart(first, second, third) {
+    // Look at the first code point:
+
+    // U+002B PLUS SIGN (+)
+    // U+002D HYPHEN-MINUS (-)
+    if (first === 0x002B || first === 0x002D) {
+        // If the second code point is a digit, return true.
+        if (isDigit(second)) {
+            return 2;
+        }
+
+        // Otherwise, if the second code point is a U+002E FULL STOP (.)
+        // and the third code point is a digit, return true.
+        // Otherwise, return false.
+        return second === 0x002E && isDigit(third) ? 3 : 0;
+    }
+
+    // U+002E FULL STOP (.)
+    if (first === 0x002E) {
+        // If the second code point is a digit, return true. Otherwise, return false.
+        return isDigit(second) ? 2 : 0;
+    }
+
+    // digit
+    if (isDigit(first)) {
+        // Return true.
+        return 1;
+    }
+
+    // anything else
+    // Return false.
+    return 0;
+}
+
+//
+// Misc
+//
+
+// detect BOM (https://en.wikipedia.org/wiki/Byte_order_mark)
+function isBOM(code) {
+    // UTF-16BE
+    if (code === 0xFEFF) {
+        return 1;
+    }
+
+    // UTF-16LE
+    if (code === 0xFFFE) {
+        return 1;
+    }
+
+    return 0;
+}
+
+// Fast code category
+// Only ASCII code points has a special meaning, that's why we define a maps for 0..127 codes only
+const CATEGORY = new Array(0x80);
+const EofCategory = 0x80;
+const WhiteSpaceCategory = 0x82;
+const DigitCategory = 0x83;
+const NameStartCategory = 0x84;
+const NonPrintableCategory = 0x85;
+
+for (let i = 0; i < CATEGORY.length; i++) {
+    CATEGORY[i] =
+        isWhiteSpace(i) && WhiteSpaceCategory ||
+        isDigit(i) && DigitCategory ||
+        isNameStart(i) && NameStartCategory ||
+        isNonPrintable(i) && NonPrintableCategory ||
+        i || EofCategory;
+}
+
+function charCodeCategory(code) {
+    return code < 0x80 ? CATEGORY[code] : NameStartCategory;
+}
+
+exports.DigitCategory = DigitCategory;
+exports.EofCategory = EofCategory;
+exports.NameStartCategory = NameStartCategory;
+exports.NonPrintableCategory = NonPrintableCategory;
+exports.WhiteSpaceCategory = WhiteSpaceCategory;
+exports.charCodeCategory = charCodeCategory;
+exports.isBOM = isBOM;
+exports.isDigit = isDigit;
+exports.isHexDigit = isHexDigit;
+exports.isIdentifierStart = isIdentifierStart;
+exports.isLetter = isLetter;
+exports.isLowercaseLetter = isLowercaseLetter;
+exports.isName = isName;
+exports.isNameStart = isNameStart;
+exports.isNewline = isNewline;
+exports.isNonAscii = isNonAscii;
+exports.isNonPrintable = isNonPrintable;
+exports.isNumberStart = isNumberStart;
+exports.isUppercaseLetter = isUppercaseLetter;
+exports.isValidEscape = isValidEscape;
+exports.isWhiteSpace = isWhiteSpace;