CsCodeGenerator

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CsCodeGenerator

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Easy C# class and code generation, POCO object and Methods creation

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## CodeGenerator
This is a small .NET library that enables easy C# code generation based on Classes and its elements.  
It has ability to create `ClassModels` (POCO object generator) and Methods and write it to .cs files.  
Can specify their Members (`Constructor`, `Field`, `Property`, `Method`) including `Attributes` and `Parameters`.  
Defining `namespace` and `using` Directives is supported as well.  
Library can also generate `Enums` and `Interfaces`, and create `NestedClasses` inside parent class.

**BaseElement** has Config for: `IndentSize, Comment, CommentHasSummaryTag(df:true), AccessModifier, BuiltInDataType, CustomDataType, Name`  
**Property** more Config: `IsGetOnly, IsAutoImplemented, GetterBody, SetterBody`  
**CsGenerator** Settings are: `DefaultTabSize`: *4* | `OutputDirectory`: "*Output*" |  
-- List of components --  
**AccessModifier**: `public, private, protected, internal, protected_internal`  
**BuiltInDataType**: `void, bool, byte, int, long, decimal, float, double, char, string, object`  
**CommonDataType**: `DateTime, Guid`  
**KeyWord**: `this, abstract, partial, static, new, virtual, override, sealed, const, async, readOnly`  
***IndentType***: `None, Single, Double, Triple, Quadruple`

For more complex code with indented segments specific Indent value should be set (prepend in a loop) for all internal lines/elements.

Package targets .NET Standard 2.0 so can be used both with .NetFramework and .NetCore / .Net (new unified)

Logo: <img src="CSCodeGeneratorLogo.png" height=30>

[![NuGet](https://img.shields.io/npm/l/express.svg)](https://github.com/borisdj/CsCodeGenerator/blob/master/LICENSE)

## Installation
Available on [![NuGet](https://img.shields.io/nuget/v/CsCodeGenerator.svg)](https://www.nuget.org/packages/CsCodeGenerator/) latest version.  
Package manager console command for installation: *Install-Package CsCodeGenerator*

## Support
If you find this project useful you can mark it by leaving a Github **Star** :star:  
If you want help development, you can become a CONTRIBUTOR or you can make a DONATION:  
[<img src="https://www.buymeacoffee.com/assets/img/custom_images/yellow_img.png" alt="Buy Me A Coffee" height=28>](https://www.buymeacoffee.com/boris.dj) _ or _ 
[![Button](https://img.shields.io/badge/donate-Bitcoin-orange.svg?logo=bitcoin):zap:](https://borisdj.net/donation/donate-btc.html)  
Want to **Contact** for Development & Consulting: [www.codis.tech](http://www.codis.tech) (*Quality Assurance*)

## Contributing
Please read [CONTRIBUTING](CONTRIBUTING.md) for details on code of conduct, and the process for submitting pull requests.  
When opening issues do write detailed explanation of the problem or feature with reproducible example.

**Also take a look into others packages:</br>
Open source (MIT or cFOSS) authored [.Net libraries](https://infopedia.io/dot-net-libraries/) (@**Infopedia.io** personal blog post)
| №  | .Net library             | Description                                              |
| -  | ------------------------ | -------------------------------------------------------- |
| 1  | [EFCore.BulkExtensions](https://github.com/borisdj/EFCore.BulkExtensions) | EF Core Bulk CRUD Ops (**Flagship** Lib) |
| 2  | [EFCore.UtilExtensions](https://github.com/borisdj/EFCore.UtilExtensions) | EF Core Custom Annotations and AuditInfo |
| 3  | [EFCore.FluentApiToAnnotation](https://github.com/borisdj/EFCore.FluentApiToAnnotation) | Converting FluentApi configuration to Annotations |
| 4  | [FixedWidthParserWriter](https://github.com/borisdj/FixedWidthParserWriter) | Reading & Writing fixed-width/flat data files |
| 5* | [CsCodeGenerator](https://github.com/borisdj/CsCodeGenerator) | C# code generation based on Classes and elements |
| 6  | [CsCodeExample](https://github.com/borisdj/CsCodeExample) | Examples of C# code in form of a simple tutorial |

## GeneratorModel Structure:

**Class Inheritance Hierarchy**
```csharp
                                |-* BaseElement
              ClassModel : -----|
Property : -- Field : ----------|
Constructor : Method : ---------|
              EnumModel : ------|
              InterfaceModel : -|
```
**Component Composition**
```csharp
CsGenerator
|
|---Files
	|
	|---Enums
	|
	|---Classes
		|
		|---Fields
		|
		|---Constructors (DefaultConstructor first)
		|	|---Attributes
		|	|	|--- Parameters
		|	|
		|	|---Parameters
		|
		|---Properties
		|	|---Attributes
		|	|	|--- Parameters
		|	|
		|	|---Parameters
		|
		|---Methods
		|	|---Attributes
		|	|	|--- Parameters
		|	|
		|	|---Parameters
		|
		|---NestedClasses (recursively)
			|--- ...
```

## How to use it 
Following is first example of ComplexNumber class and then creating its ClassModel for writing to Complex.cs  
There are 2 option to configure it:  
-one is using Fluent methods (A)  
-and other with pure classes and properties (B)

Class we want to generate:
```csharp
using System;
using System.Model;

namespace CsCodeGenerator.Tests
{
    [Description("Some class info")]
    public partial class ComplexNumber : SomeBaseClass, NumbericInterface
    {
        protected const double PI = 3.14;
        private string remark;

public ComplexNumber() { }

public ComplexNumber(double real, double imaginary = 0)
        {
            Real = real;
            Imaginary = imaginary;
        }

public static string DefaultFormat { get; } = "a + b * i";

public double Real { get; set; }

public double Imaginary { get; set; }

public virtual string Remark
        {
            get { return remark; }
            set { remark = value; }
        }

public double Modul()
        {
            return Math.Sqrt(Real * Real + Imaginary * Imaginary);
        }

public ComplexNumber Add(ComplexNumber input)
        {
            ComplexNumber result = new ComplexNumber();
            result.Real = Real + input.Real;
            result.Imaginary = Imaginary + input.Imaginary;
            return result;
        }

/// <summary>
        // example of 2 KeyWords(new and virtual), usually here would be just virtual
        /// <summary>
        public new virtual string ToString()
        {
            return $"({Real:0.00}, {Imaginary:0.00})";
        }
    }
}
```

A) Code to do it with Fluent methods - shorter code and more readable syntax. [***With**Element()* such as `WithProperty`].
Fluent calls are composed with BaseElement, when configuring deeper level we need to instanciate with New and call in the scope.  
To be able to get subElements returned to main scope (like EFCore FluentAPI setting works) then more extension methods would be needed - one example is commented in source code: `WithPropertyReturn`.
```csharp
var usingDirectives = new List<string>
{
    "System;",
    "System.ComponentModel;"
};
string fileNameSpace = "CsCodeGenerator.Tests";
string complexNumberText = "ComplexNumber";

// Class
var classModel = new ClassModel();
var indent = classModel.Indent;

var complexNumberFile = new FileModel(complexNumberText);
complexNumberFile.LoadUsingDirectives(usingDirectives);
complexNumberFile.Namespace = fileNameSpace;
complexNumberFile.Classes.Add(complexNumberClass);

var csGenerator = new CsGenerator();
csGenerator.Files.Add(complexNumberFile);
csGenerator.CreateFiles();
```

B) Alternative way without Fluent:
```csharp
var usingDirectives = new List<string>
{
    "using System;",
    "using System.ComponentModel;"
};
string fileNameSpace = $"{Util.Namespace} CsCodeGenerator.Tests";
string complexNumberText = "ComplexNumber";

ClassModel complexNumberClass = new ClassModel(complexNumberText);
complexNumberClass.SingleKeyWord = KeyWord.Partial; // one way to set single KeyWord
//complexNumberClass.KeyWords.Add(KeyWord.Partial); // or alternative way
complexNumberClass.BaseClass =  "SomeBaseClass";
complexNumberClass.Interfaces.Add("NumbericInterface)";

var descriptionAttribute = new AttributeModel("Description")
{
    SingleParameter = new Parameter(@"""Some class info""")
};
complexNumberClass.AddAttribute(descriptionAttribute);

complexNumberClass.DefaultConstructor.IsVisible = true;

Constructor secondConstructor = new Constructor(complexNumberClass.Name);
secondConstructor.Parameters.Add(new Parameter(BuiltInDataType.Double, "real"));
secondConstructor.Parameters.Add(new Parameter(BuiltInDataType.Double, "imaginary") { Value ="0" });
secondConstructor.BodyLines.Add("Real = real;");
secondConstructor.BodyLines.Add("Imaginary = imaginary;");
complexNumberClass.Constructors.Add(secondConstructor);

var fields = new Field[]
{
    new Field(BuiltInDataType.Double, "PI") { SingleKeyWord = KeyWord.Const, DefaultValue ="3.14" },
    new Field(BuiltInDataType.String, "remark") { AccessModifier = AccessModifier.Private },
}.ToDictionary(a => a.Name, a => a);

var properties = new Property[]
{
    new Property(BuiltInDataType.String, "DefaultFormat")
    {
        SingleKeyWord = KeyWord.Static,
        IsGetOnly = true,
        DefaultValue = @"""a + b * i"""
    },
    new Property(BuiltInDataType.Double, "Real"),
    new Property(BuiltInDataType.Double, "Imaginary"),
    new Property(BuiltInDataType.String, "Remark")
    {
        SingleKeyWord = KeyWord.Virtual,
        IsAutoImplemented = false,
        GetterBody = "remark",
        SetterBody = "remark = value"

},
}.ToDictionary(a => a.Name, a => a);

complexNumberClass.Fields = fields;
complexNumberClass.Properties = properties;
complexNumberClass.Methods = methods;

FileModel complexNumberFile = new FileModel(complexNumberText);
complexNumberFile.LoadUsingDirectives(usingDirectives);
complexNumberFile.Namespace = fileNameSpace;
complexNumberFile.Classes.Add(complexNumberClass.Name, complexNumberClass);

CsGenerator csGenerator = new CsGenerator();
csGenerator.Files.Add(complexNumberFile.Name, complexNumberFile);
csGenerator.CreateFiles(); //Console.Write(complexNumberFile); 
```

CsCodeGenerator

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