react-emoji-popup-lister/dist/util/emoji-substring.js

React emoji search & select by colon syntax, with keyboard navigation

// Space, \n, \r
var stopChars = [" ", String.fromCharCode(10), String.fromCharCode(13)];
var emojiSubstring = function (text, caret, strict) {
    if (strict === void 0) { strict = true; }
    // Early reject check
    if (!text.length
        || text[caret] === " "
        || text.indexOf(":") < 0
        || caret < 0) {
        return "";
    }
    // Store partial strings, and indices
    var rtxt = "";
    var ltxt = "";
    var li = caret;
    var ri = caret;
    // Increment from caret to end of word. Stop on: space, \n, \r, or end of value
    while (text[ri] && stopChars.indexOf(text[ri]) < 0) {
        rtxt += text[ri];
        if (text[ri] === ":" && text[ri + 1] === ":") {
            break;
        }
        ri++;
    }
    // Return if caret is on ":"
    if (rtxt.charAt(0) === ":" && rtxt.length > 1) {
        // If strict, check for characters after, and cases before ":"
        if (!strict) {
            return rtxt;
        }
        else if (!text[caret - 1]
            || stopChars.indexOf(text[caret - 1]) >= 0
            || text[caret - 1] === ":") {
            return rtxt;
        }
    }
    // Decrement from caret to beginning
    while (text[li]) {
        // At space before, or beginning
        if (text[li] === " " || !text[li - 1]) {
            return "";
        }
        li--;
        if (text[li]) {
            ltxt += text[li];
        }
        // Stop at beginning, space, \n, \r, or another ":"
        // Allows " :abc", ":abc::abc:"
        // If strict, reject "https://abc"
        if (text[li] === ":") {
            if (!text[li - 1]
                || stopChars.indexOf(text[li - 1]) > -1
                || text[li - 1] === ":"
                || !strict) {
                break;
            }
            else {
                return "";
            }
        }
    }
    ltxt = ltxt.split("").reverse()
        .join("");
    var substring = "".concat(ltxt).concat(rtxt);
    return substring || "";
};
export default emojiSubstring;
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