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Directory : /var/app/comcon24/cms/node_modules/css-tree/lib/tokenizer/

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Current File : /var/app/comcon24/cms/node_modules/css-tree/lib/tokenizer/utils.js

var charCodeDef = require('./char-code-definitions');
var isDigit = charCodeDef.isDigit;
var isHexDigit = charCodeDef.isHexDigit;
var isUppercaseLetter = charCodeDef.isUppercaseLetter;
var isName = charCodeDef.isName;
var isWhiteSpace = charCodeDef.isWhiteSpace;
var isValidEscape = charCodeDef.isValidEscape;

function getCharCode(source, offset) {
    return offset < source.length ? source.charCodeAt(offset) : 0;
}

function getNewlineLength(source, offset, code) {
    if (code === 13 /* \r */ && getCharCode(source, offset + 1) === 10 /* \n */) {
        return 2;
    }

    return 1;
}

function cmpChar(testStr, offset, referenceCode) {
    var code = testStr.charCodeAt(offset);

    // code.toLowerCase() for A..Z
    if (isUppercaseLetter(code)) {
        code = code | 32;
    }

    return code === referenceCode;
}

function cmpStr(testStr, start, end, referenceStr) {
    if (end - start !== referenceStr.length) {
        return false;
    }

    if (start < 0 || end > testStr.length) {
        return false;
    }

    for (var i = start; i < end; i++) {
        var testCode = testStr.charCodeAt(i);
        var referenceCode = referenceStr.charCodeAt(i - start);

        // testCode.toLowerCase() for A..Z
        if (isUppercaseLetter(testCode)) {
            testCode = testCode | 32;
        }

        if (testCode !== referenceCode) {
            return false;
        }
    }

    return true;
}

function findWhiteSpaceStart(source, offset) {
    for (; offset >= 0; offset--) {
        if (!isWhiteSpace(source.charCodeAt(offset))) {
            break;
        }
    }

    return offset + 1;
}

function findWhiteSpaceEnd(source, offset) {
    for (; offset < source.length; offset++) {
        if (!isWhiteSpace(source.charCodeAt(offset))) {
            break;
        }
    }

    return offset;
}

function findDecimalNumberEnd(source, offset) {
    for (; offset < source.length; offset++) {
        if (!isDigit(source.charCodeAt(offset))) {
            break;
        }
    }

    return offset;
}

// § 4.3.7. Consume an escaped code point
function consumeEscaped(source, offset) {
    // It assumes that the U+005C REVERSE SOLIDUS (\) has already been consumed and
    // that the next input code point has already been verified to be part of a valid escape.
    offset += 2;

    // hex digit
    if (isHexDigit(getCharCode(source, offset - 1))) {
        // Consume as many hex digits as possible, but no more than 5.
        // Note that this means 1-6 hex digits have been consumed in total.
        for (var maxOffset = Math.min(source.length, offset + 5); offset < maxOffset; offset++) {
            if (!isHexDigit(getCharCode(source, offset))) {
                break;
            }
        }

        // If the next input code point is whitespace, consume it as well.
        var code = getCharCode(source, offset);
        if (isWhiteSpace(code)) {
            offset += getNewlineLength(source, offset, code);
        }
    }

    return offset;
}

// §4.3.11. Consume a name
// Note: This algorithm does not do the verification of the first few code points that are necessary
// to ensure the returned code points would constitute an <ident-token>. If that is the intended use,
// ensure that the stream starts with an identifier before calling this algorithm.
function consumeName(source, offset) {
    // Let result initially be an empty string.
    // Repeatedly consume the next input code point from the stream:
    for (; offset < source.length; offset++) {
        var code = source.charCodeAt(offset);

        // name code point
        if (isName(code)) {
            // Append the code point to result.
            continue;
        }

        // the stream starts with a valid escape
        if (isValidEscape(code, getCharCode(source, offset + 1))) {
            // Consume an escaped code point. Append the returned code point to result.
            offset = consumeEscaped(source, offset) - 1;
            continue;
        }

        // anything else
        // Reconsume the current input code point. Return result.
        break;
    }

    return offset;
}

// §4.3.12. Consume a number
function consumeNumber(source, offset) {
    var code = source.charCodeAt(offset);

    // 2. If the next input code point is U+002B PLUS SIGN (+) or U+002D HYPHEN-MINUS (-),
    // consume it and append it to repr.
    if (code === 0x002B || code === 0x002D) {
        code = source.charCodeAt(offset += 1);
    }

    // 3. While the next input code point is a digit, consume it and append it to repr.
    if (isDigit(code)) {
        offset = findDecimalNumberEnd(source, offset + 1);
        code = source.charCodeAt(offset);
    }

    // 4. If the next 2 input code points are U+002E FULL STOP (.) followed by a digit, then:
    if (code === 0x002E && isDigit(source.charCodeAt(offset + 1))) {
        // 4.1 Consume them.
        // 4.2 Append them to repr.
        code = source.charCodeAt(offset += 2);

        // 4.3 Set type to "number".
        // TODO

        // 4.4 While the next input code point is a digit, consume it and append it to repr.

        offset = findDecimalNumberEnd(source, offset);
    }

    // 5. If the next 2 or 3 input code points are U+0045 LATIN CAPITAL LETTER E (E)
    // or U+0065 LATIN SMALL LETTER E (e), ... , followed by a digit, then:
    if (cmpChar(source, offset, 101 /* e */)) {
        var sign = 0;
        code = source.charCodeAt(offset + 1);

        // ... optionally followed by U+002D HYPHEN-MINUS (-) or U+002B PLUS SIGN (+) ...
        if (code === 0x002D || code === 0x002B) {
            sign = 1;
            code = source.charCodeAt(offset + 2);
        }

        // ... followed by a digit
        if (isDigit(code)) {
            // 5.1 Consume them.
            // 5.2 Append them to repr.

            // 5.3 Set type to "number".
            // TODO

            // 5.4 While the next input code point is a digit, consume it and append it to repr.
            offset = findDecimalNumberEnd(source, offset + 1 + sign + 1);
        }
    }

    return offset;
}

// § 4.3.14. Consume the remnants of a bad url
// ... its sole use is to consume enough of the input stream to reach a recovery point
// where normal tokenizing can resume.
function consumeBadUrlRemnants(source, offset) {
    // Repeatedly consume the next input code point from the stream:
    for (; offset < source.length; offset++) {
        var code = source.charCodeAt(offset);

        // U+0029 RIGHT PARENTHESIS ())
        // EOF
        if (code === 0x0029) {
            // Return.
            offset++;
            break;
        }

        if (isValidEscape(code, getCharCode(source, offset + 1))) {
            // Consume an escaped code point.
            // Note: This allows an escaped right parenthesis ("\)") to be encountered
            // without ending the <bad-url-token>. This is otherwise identical to
            // the "anything else" clause.
            offset = consumeEscaped(source, offset);
        }
    }

    return offset;
}

module.exports = {
    consumeEscaped: consumeEscaped,
    consumeName: consumeName,
    consumeNumber: consumeNumber,
    consumeBadUrlRemnants: consumeBadUrlRemnants,

    cmpChar: cmpChar,
    cmpStr: cmpStr,

    getNewlineLength: getNewlineLength,
    findWhiteSpaceStart: findWhiteSpaceStart,
    findWhiteSpaceEnd: findWhiteSpaceEnd
};

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