Class creator last Update

var className;

function capitaliseFirstLetter(string)
{
    return string.charAt(0).toUpperCase() + string.slice(1);
}

function generateClass() {
    className = document.getElementById("base-class").value;
    var fields = document.getElementById("fields").value;

    var fieldTypePair = fields.split(",");

    var fieldNames = [];
    var fieldTypes = [];

    for (var i = 0; i < fieldTypePair.length; i++) {
        var splittedFieldType = fieldTypePair[i].split(":");
        fieldNames.push(splittedFieldType[0].trim());
        fieldTypes.push(splittedFieldType[1].trim());
    }

    var constructorSettersString = '';

    for (var j = 0; j < fieldNames.length; j++) {
        constructorSettersString += "\t\tthis.set" + capitaliseFirstLetter(fieldNames[j]) +
            "(" + fieldNames[j] + ");\n";
    }

    var abstractConstructor = '';

    if (document.getElementById("abstract").checked == true) {
        abstractConstructor += "\t\tif (this.constructor === " + className + ") {\n\t\t\t" +
            "throw new Error('Cannot instantiate abstract class " + className + ".');\n\t\t" +
            "}\n";
    }

    var classCode = "var " + className + " = (function () {\n" +
        "\tfunction " + className + "(" + fieldNames.join(", ") + ") {\n" + abstractConstructor +
        constructorSettersString + "\t}\n";

    for (var k = 0; k < fieldNames.length; k++) {
        classCode += "\n";
        classCode += generateGetter(fieldNames[k]);
        classCode += "\n";
        classCode += generateSetter(fieldNames[k], fieldTypes[k]);
    }

    classCode += "\n\n\t" + className + ".prototype.toString = function () {\n\t\treturn ";

    var toStringOutput = "'" + capitaliseFirstLetter(fieldNames[0]) + ": ' + this.get" +
        capitaliseFirstLetter(fieldNames[0]) + "()";

    for (var l = 1; l < fieldNames.length; l++) {
        toStringOutput += " + '" + capitaliseFirstLetter(fieldNames[l]) + ": ' + " +
            "this.get" + capitaliseFirstLetter(fieldNames[l]) + "()";
    }

    toStringOutput += ";\n\t};";

    classCode += toStringOutput;

    classCode += "\n\n\treturn " + className + ";\n}());";

    document.getElementById("output").value = classCode;
}

function generateGetter(fieldName) {
    return "\t" + className + ".prototype.get" + capitaliseFirstLetter(fieldName) +
        " = function() {\n\t\treturn this._" + fieldName + ";\n\t};\n";
}

function generateSetter(fieldName, fieldType) {
    var fieldValidator;

    if (fieldType == 'string') {
            fieldValidator = '\tString.prototype.validateNonEmptyString(' + fieldName + ');\n';
    } else if (fieldType == 'number') {
        fieldValidator = '\tNumber.prototype.validateIsNumber(' + fieldName + ');\n';

    } else if (fieldType == 'boolean') {
        fieldValidator = '\tBoolean.prototype.validateBoolean(' + fieldName + ');\n';
    }

    return "\t" + className + ".prototype.set" + capitaliseFirstLetter(fieldName) + " = function(" +
        fieldName + ") {\n\t" + fieldValidator +
        "\t\tthis._" + fieldName + " = " + fieldName + ";\n\t};\n";
}