hedgedoc/public/js/lib/editor/utils.js

const wrapSymbols = ['*', '_', '~', '^', '+', '='];
export function wrapTextWith(editor, cm, symbol) {
    if (!cm.getSelection()) {
        return CodeMirror.Pass;
    } else {
        var ranges = cm.listSelections();
        for (var i = 0; i < ranges.length; i++) {
            var range = ranges[i];
            if (!range.empty()) {
                var from = range.from(), to = range.to();
                if (symbol !== 'Backspace') {
                    cm.replaceRange(symbol, to, to, '+input');
                    cm.replaceRange(symbol, from, from, '+input');
                    // workaround selection range not correct after add symbol
                    var _ranges = cm.listSelections();
                    var anchorIndex = editor.indexFromPos(_ranges[i].anchor);
                    var headIndex = editor.indexFromPos(_ranges[i].head);
                    if (anchorIndex > headIndex) {
                        _ranges[i].anchor.ch--;
                    } else {
                        _ranges[i].head.ch--;
                    }
                    cm.setSelections(_ranges);
                } else {
                    var preEndPos = {
                        line: to.line,
                        ch: to.ch + 1
                    };
                    var preText = cm.getRange(to, preEndPos);
                    var preIndex = wrapSymbols.indexOf(preText);
                    var postEndPos = {
                        line: from.line,
                        ch: from.ch - 1
                    };
                    var postText = cm.getRange(postEndPos, from);
                    var postIndex = wrapSymbols.indexOf(postText);
                    // check if surround symbol are list in array and matched
                    if (preIndex > -1 && postIndex > -1 && preIndex === postIndex) {
                        cm.replaceRange("", to, preEndPos, '+delete');
                        cm.replaceRange("", postEndPos, from, '+delete');
                    }
                }
            }
        }
    }
}