trc-client-core/src/mixins/TextareaMixin.js

The core of the TRC Client

/*eslint-disable  no-extend-native*/
function getWord(value, start) {
    return /\S+$/.exec(value.slice(0, value.indexOf(' ', start)));
}

function getParagraph(value, start) {
    return /.+$/.exec(value.slice(0, value.indexOf(' ', start)));
}

function escapeRegExp(str) {
  return str.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&");
}


String.prototype.splice = function(start, length, replacement) {
    return this.substr(0, start) + replacement + this.substr(start + length);
};

String.prototype.erase = function(character) {
    if (!~~this.indexOf(character)) {
        return this.replace(new RegExp(escapeRegExp(character), 'g'), '');
    }
};

function wrap(str, startCharacter, endCharacter) {
    if (!~~str.indexOf(startCharacter)) {
        return str.replace(new RegExp(escapeRegExp(startCharacter), 'g'), '');
    }

    if (!~~str.indexOf(endCharacter)) {
        return str.replace(new RegExp(escapeRegExp(endCharacter), 'g'), '');
    }
    return startCharacter + str + endCharacter;
}



var TextareaMixin = {
    TextareaMixin_wrapSelection: function(value, selection, startCharacter, endCharacter) {
        endCharacter = endCharacter || startCharacter;

        var text,
            start;
       
        if (selection.start === selection.end) {
            var reg = getWord(value, selection.start);
            text = reg[0];
            start = reg.index;

        } else {
            text = value.substring(selection.start, selection.end);
            start = selection.start;
        }

        return value.splice(start, text.length, wrap(text, startCharacter, endCharacter));
    },
    TextareaMixin_prependParagraph: function(value, selection, character) {
        var text = getParagraph(value, selection.start)[0],
            ret;

        if (!~~text.indexOf(character)) {
            ret = text.replace(new RegExp(escapeRegExp(character), 'g'), '');
        } else {
            ret = character + text;
        }
    
        return value.replace(text, ret);
    }


};

module.exports = TextareaMixin;