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Filename : char-code-definitions.js
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var 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>.
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
//
// https://drafts.csswg.org/css-syntax/#tokenizer-definitions
// > non-ASCII code point
// >   A code point with a value equal to or greater than U+0080 <control>
// > name-start code point
// >   A letter, a non-ASCII code point, or U+005F LOW LINE (_).
// > name code point
// >   A name-start code point, a digit, or U+002D HYPHEN-MINUS (-)
// That means only ASCII code points has a special meaning and we define a maps for 0..127 codes only
var CATEGORY = new Array(0x80);
charCodeCategory.Eof = 0x80;
charCodeCategory.WhiteSpace = 0x82;
charCodeCategory.Digit = 0x83;
charCodeCategory.NameStart = 0x84;
charCodeCategory.NonPrintable = 0x85;

for (var i = 0; i < CATEGORY.length; i++) {
    switch (true) {
        case isWhiteSpace(i):
            CATEGORY[i] = charCodeCategory.WhiteSpace;
            break;

        case isDigit(i):
            CATEGORY[i] = charCodeCategory.Digit;
            break;

        case isNameStart(i):
            CATEGORY[i] = charCodeCategory.NameStart;
            break;

        case isNonPrintable(i):
            CATEGORY[i] = charCodeCategory.NonPrintable;
            break;

        default:
            CATEGORY[i] = i || charCodeCategory.Eof;
    }
}

function charCodeCategory(code) {
    return code < 0x80 ? CATEGORY[code] : charCodeCategory.NameStart;
};

module.exports = {
    isDigit: isDigit,
    isHexDigit: isHexDigit,
    isUppercaseLetter: isUppercaseLetter,
    isLowercaseLetter: isLowercaseLetter,
    isLetter: isLetter,
    isNonAscii: isNonAscii,
    isNameStart: isNameStart,
    isName: isName,
    isNonPrintable: isNonPrintable,
    isNewline: isNewline,
    isWhiteSpace: isWhiteSpace,
    isValidEscape: isValidEscape,
    isIdentifierStart: isIdentifierStart,
    isNumberStart: isNumberStart,

    isBOM: isBOM,
    charCodeCategory: charCodeCategory
};