furitool.js

var katescript = {
    "author": "Hector Martin <marcan@marcan.st>",
    "license": "BSD",
    "revision": 1,
    "kate-version": "5.1",
    "functions": ["furiTool"],
    "actions": [
        {   "function": "furiTool",
            "name": "Insert Furigana",
            "category": "Quick Coding",
            "interactive": "false"
        }
    ]
};

require('cursor.js');
require('range.js');

function doFuri (start, end)
{
    if (start.line != end.line) {
        return;
    }
    var width = end.column - start.column;
    if (width <= 1) {
        document.editBegin();
        view.clearSelection();
        document.insertText(end, "()");
        end.column++;
        view.setCursorPosition(end);
        document.editEnd();
    } else {
        document.editBegin();
        view.clearSelection();
        document.insertText(start, "{");
        end.column++;
        document.insertText(end, "}()");
        end.column += 2;
        view.setCursorPosition(end);
        document.editEnd();
    }
}

function findNext (pos)
{
    var kanji = /[\u4e00-\u9fff]+/;
    while (pos.line < document.lines()) {
        var text = document.line(pos.line);
        var left = text.substr(pos.column);
        var match = kanji.exec(left);
        if (match) {
            pos.column += match.index;
            var end = new Cursor(pos.line, pos.column + match[0].length);
            return [pos, end];
        }
        pos.line += 1;
        pos.column = 0;
    }
    return null;
}

function furiTool ()
{
    var pos = view.cursorPosition();
    var selectionRange = view.selection();

    if (!selectionRange.isValid()) {
        var next = document.charAt(pos);
        if (next == ")") {
            pos = findNext(pos);
            if (pos !== null) {
                doFuri(pos[0], pos[1]);
            }
        } else {
            doFuri(pos, pos);
        }
    } else {
        doFuri(selectionRange.start, selectionRange.end);
    }
}