【スクリプト】検索欄のカーソル位置の単語に二重引用符を追加する【公開】

// ==UserScript==
// @name         AddDoubleQuotes
// @namespace    https://aldelog.fc2.page/?p=9
// @version      0.1
// @description  Pressing the F2 key adds double quotes to the word at the text cursor position. Pressing Alt + F2 adds double quotes to the entire text.
// @description:ja  F2キーを押すとテキストカーソル位置の単語に対して二重引用符を付加します。Alt + F2キーを押すとテキスト全体に対して二重引用符を付加します。
// @author       Alde
// @match        *://*/*
// @grant        none
// ==/UserScript==

document.addEventListener('keyup', keyup_event);
document.addEventListener('keydown', keydown_event);
var IsRightAfterAddquote = false;

function strIns(str, idx, val){
    var res = str.slice(0, idx) + val + str.slice(idx);
    return res;
};

function keydown_event(e) {

    if (location.host == "twitter.com")
    {
        if (document.activeElement.value != null)
        {
            var SearchWord = document.activeElement.value;
        }
        else
        {return;}

        if(e.key === 'Enter' && IsRightAfterAddquote){

            location.href = ('https://twitter.com/search?q=' + encodeURI(SearchWord));
        }
    }

    IsRightAfterAddquote = false;
};

function keyup_event(e) {

    IsRightAfterAddquote = false;

    if(e.altKey)
    {
        if(e.key === 'F2')
        {
             if (document.activeElement.value != null)
             {
                 document.activeElement.value = "\"" + document.activeElement.value + "\"";
                 IsRightAfterAddquote = true;
             }
        }
    }
    else if(e.key === 'F2'){

        if (document.activeElement.value != null)
        {
            var SearchBox = document.activeElement;
            var SearchWord = SearchBox.value;
            var i = SearchBox.selectionStart;
            var j = SearchBox.selectionEnd;

            if (i != j)
            {
                SearchWord = strIns(SearchWord, i, "\"");
                SearchWord = strIns(SearchWord, j + 1, "\"");
                document.activeElement.value = SearchWord;
                return false;
            }

            var mae = SearchWord.substring(0, i);
            var space1_1 = mae.lastIndexOf(' ');
            var space1_2 = mae.lastIndexOf('　');
            var space1 = (space1_1 >= space1_2) ? space1_1 : space1_2;
            var maefx;

            if (space1 < 0)
            {
                maefx = mae;
            }
            else
            {
                maefx = mae.substring(space1 + 1, i);
            }
            var ato = SearchWord.substring(i);
            var space2_1 = ato.indexOf(' ');
            var space2_2 = ato.indexOf('　');

            var space2 = (space2_1 < space2_2) ? space2_1 : space2_2;
            if (space2_1 == -1)
            {
                space2 = space2_2;
            }
            if (space2_2 == -1)
            {
                space2 = space2_1;
            }

            var atofx;

            if (space2 < 0)
            {
                atofx = ato;
                space2 = SearchWord.length;
            }
            else
            {
                atofx = ato.substring(0, space2);
            }
            var single_word = maefx + atofx;
            SearchWord = strIns(SearchWord, space1 + 1, "\"");
            SearchWord = strIns(SearchWord, space2 + i + 1, "\"");

            document.activeElement.value = SearchWord;
            IsRightAfterAddquote = true;
        }
    }

    return false;
}