@zxing/text-encoding/esm/encoding/utilities.js

Polyfill for the Encoding Living Standard's API.

/**
 * @param {number} a The number to test.
 * @param {number} min The minimum value in the range, inclusive.
 * @param {number} max The maximum value in the range, inclusive.
 * @return {boolean} True if a >= min and a <= max.
 */
export function inRange(a, min, max) {
    return min <= a && a <= max;
}
/**
 * @param {!Array.<*>} array The array to check.
 * @param {*} item The item to look for in the array.
 * @return {boolean} True if the item appears in the array.
 */
export function includes(array, item) {
    return array.indexOf(item) !== -1;
}
/**
 * @param {*} o
 * @return {Object}
 */
export function ToDictionary(o) {
    if (o === undefined || o === null)
        return {};
    if (o === Object(o))
        return o;
    throw TypeError('Could not convert argument to dictionary');
}
/**
 * @param {string} string Input string of UTF-16 code units.
 * @return {!Array.<number>} Code points.
 */
export function stringToCodePoints(string) {
    // https://heycam.github.io/webidl/#dfn-obtain-unicode
    // 1. Let S be the DOMString value.
    var s = String(string);
    // 2. Let n be the length of S.
    var n = s.length;
    // 3. Initialize i to 0.
    var i = 0;
    // 4. Initialize U to be an empty sequence of Unicode characters.
    var u = [];
    // 5. While i < n:
    while (i < n) {
        // 1. Let c be the code unit in S at index i.
        var c = s.charCodeAt(i);
        // 2. Depending on the value of c:
        // c < 0xD800 or c > 0xDFFF
        if (c < 0xD800 || c > 0xDFFF) {
            // Append to U the Unicode character with code point c.
            u.push(c);
        }
        // 0xDC00 ≤ c ≤ 0xDFFF
        else if (0xDC00 <= c && c <= 0xDFFF) {
            // Append to U a U+FFFD REPLACEMENT CHARACTER.
            u.push(0xFFFD);
        }
        // 0xD800 ≤ c ≤ 0xDBFF
        else if (0xD800 <= c && c <= 0xDBFF) {
            // 1. If i = n−1, then append to U a U+FFFD REPLACEMENT
            // CHARACTER.
            if (i === n - 1) {
                u.push(0xFFFD);
            }
            // 2. Otherwise, i < n−1:
            else {
                // 1. Let d be the code unit in S at index i+1.
                var d = s.charCodeAt(i + 1);
                // 2. If 0xDC00 ≤ d ≤ 0xDFFF, then:
                if (0xDC00 <= d && d <= 0xDFFF) {
                    // 1. Let a be c & 0x3FF.
                    var a = c & 0x3FF;
                    // 2. Let b be d & 0x3FF.
                    var b = d & 0x3FF;
                    // 3. Append to U the Unicode character with code point
                    // 2^16+2^10*a+b.
                    u.push(0x10000 + (a << 10) + b);
                    // 4. Set i to i+1.
                    i += 1;
                }
                // 3. Otherwise, d < 0xDC00 or d > 0xDFFF. Append to U a
                // U+FFFD REPLACEMENT CHARACTER.
                else {
                    u.push(0xFFFD);
                }
            }
        }
        // 3. Set i to i+1.
        i += 1;
    }
    // 6. Return U.
    return u;
}
/**
 * @param {!Array.<number>} code_points Array of code points.
 * @return {string} string String of UTF-16 code units.
 */
export function codePointsToString(code_points) {
    var s = '';
    for (var i = 0; i < code_points.length; ++i) {
        var cp = code_points[i];
        if (cp <= 0xFFFF) {
            s += String.fromCharCode(cp);
        }
        else {
            cp -= 0x10000;
            s += String.fromCharCode((cp >> 10) + 0xD800, (cp & 0x3FF) + 0xDC00);
        }
    }
    return s;
}
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