Testura.Code is a wrapper around the Roslyn API and used for generation, saving and compiling C# code. It provides methods and helpers to generate classes, methods, statements and expressions.
It provide helpers to generate:
- Classes
- Methods
- Parameters
- Arguments
- Attributes
- Fields
- Properties
But also simple statements like:
- Declaration statements (for example declare and assign variables)
- Iterations statements (for example for-loop)
- Jump statements (for example return)
- Selection statement (for example if-statements)
- Expression statements (for example invoke methods)
Install
NuGet 
https://www.nuget.org/packages/Testura.Code
PM> Install-Package Testura.Code
Usage
Testura.Code have three different types of helpers:
-
Generators- The most basic kinds of code generators, for example fields, properties and modifiers. -
Statement- Helpers for regular statements and expressions, for example declare and assign a variable or invoke a method. -
Builders- Currently we have two builder - One class builder and one method builder. These have the highest abstraction and are easy to use.
Documentation
Examples
Hello world
Here is an example on how to generate, save and compile a simple hello world.
Generate
var @class = new ClassBuilder("Program", "HelloWorld")
.WithUsings("System")
.WithModifiers(Modifiers.Public)
.WithMethods(
new MethodBuilder("Main")
.WithModifiers(Modifiers.Public, Modifiers.Static)
.WithParameters(new Parameter("args", typeof(string[])))
.WithBody(
BodyGenerator.Create(
Statement.Expression.Invoke("Console", "WriteLine", new List<IArgument>() { new ValueArgument("Hello world") }).AsStatement(),
Statement.Expression.Invoke("Console", "ReadLine").AsStatement()
))
.Build())
.Build();This code will generate following code:
using System;
namespace HelloWorld
{
public class Program
{
public static void Main(String[] args)
{
Console.WriteLine("Hello world");
Console.ReadLine();
}
}
}Save
var saver = new CodeSaver();
// As a string
var generatedCode = saver.SaveCodeAsString(@class);
// Or to file
saver.SaveCodeToFile(@class, @"/path/HelloWorld.cs");Compile
var compiler = new Compiler();
//To a dll
// From string
var result = await compiler.CompileSourceAsync(@"/path/HelloWorld.dll", generatedCode);
// From file
var result = await compiler.CompileFilesAsync(@"/path/HelloWorld.dll", @"/path/HelloWorld.cs");
//In memory (without creating a dll)
// From string
var result = await compiler.CompileSourceInMemoryAsync(generatedCode);
// From file
var result = await compiler.CompileFilesInMemoryAsync(@"/path/HelloWorld.cs");More advanced examples
Model class
var classBuilder = new ClassBuilder("Cat", "Models");
var @class = classBuilder
.WithUsings("System")
.WithConstructor(
ConstructorGenerator.Create(
"Cat",
BodyGenerator.Create(
Statement.Declaration.Assign("Name", ReferenceGenerator.Create(new VariableReference("name"))),
Statement.Declaration.Assign("Age", ReferenceGenerator.Create(new VariableReference("age")))),
new List<Parameter> { new Parameter("name", typeof(string)), new Parameter("age", typeof(int)) },
new List<Modifiers> { Modifiers.Public }))
.WithProperties(
PropertyGenerator.Create(new AutoProperty("Name", typeof(string), PropertyTypes.GetAndSet, new List<Modifiers> { Modifiers.Public })),
PropertyGenerator.Create(new AutoProperty("Age", typeof(int), PropertyTypes.GetAndSet, new List<Modifiers> { Modifiers.Public })))
.Build();This code will generate following code:
using System;
namespace Models
{
public class Cat
{
public Cat(string name, int age)
{
Name = name;
Age = age;
}
public string Name { get; set; }
public int Age { get; set; }
}
}Enum
var @class = new ClassBuilder("Cat", "Models")
.WithUsings("System")
.With(new EnumBuildMember("MyEnum", new List<EnumMember> { new("EnumValueOne", 2, new Attribute[] { new Attribute("MyAttribute"), }), new EnumMember("EnumValueTwo") }, new List<Modifiers> { Modifiers.Public }))
.Build();This code will generate following code:
using System;
namespace Models
{
public class Cat
{
public enum MyEnum
{
[MyAttribute]
EnumValueOne = 2,
EnumValueTwo
}
}
}Class with file scoped namespace and body properties
var @class = new ClassBuilder("Cat", "Models", NamespaceType.FileScoped)
.WithUsings("System")
.WithFields(
new Field("_name", typeof(string), new List<Modifiers>() { Modifiers.Private }),
new Field("_age", typeof(int), new List<Modifiers>() { Modifiers.Private }))
.WithConstructor(
ConstructorGenerator.Create(
"Cat",
BodyGenerator.Create(
Statement.Declaration.Assign("Name", ReferenceGenerator.Create(new VariableReference("name"))),
Statement.Declaration.Assign("Age", ReferenceGenerator.Create(new VariableReference("age")))),
new List<Parameter> { new Parameter("name", typeof(string)), new Parameter("age", typeof(int)) },
new List<Modifiers> { Modifiers.Public }))
.WithProperties(
PropertyGenerator.Create(
new BodyProperty(
"Name",
typeof(string),
BodyGenerator.Create(Statement.Jump.Return(new VariableReference("_name"))), BodyGenerator.Create(Statement.Declaration.Assign("_name", new ValueKeywordReference())),
new List<Modifiers> { Modifiers.Public })),
PropertyGenerator.Create(
new BodyProperty(
"Age",
typeof(int),
BodyGenerator.Create(Statement.Jump.Return(new VariableReference("_age"))), BodyGenerator.Create(Statement.Declaration.Assign("_age", new ValueKeywordReference())),
new List<Modifiers> { Modifiers.Public })))
.Build();This code will generate following code:
using System;
namespace Models;
public class Cat
{
private string _name;
private int _age;
public Cat(string name, int age)
{
Name = name;
Age = age;
}
public string Name
{
get
{
return _name;
}
set
{
_name = value;
}
}
public int Age
{
get
{
return _age;
}
set
{
_age = value;
}
}
}Record with primary constructor
var record = new RecordBuilder("Cat", "Models", NamespaceType.FileScoped)
.WithUsings("System")
.WithPrimaryConstructor(new Parameter("Age", typeof(int)))
.Build();This code will generate following code:
using System;
namespace Models;
public record Cat(int Age);Class with methods that override operators and comments
var @class = new ClassBuilder("Cat", "Models")
.WithUsings("System")
.WithMethods(new MethodBuilder("MyMethod")
.WithModifiers(Modifiers.Public, Modifiers.Static)
.WithOperatorOverloading(Operators.Increment)
.WithParameters(new Parameter("MyParameter", typeof(string)))
.WithBody(
BodyGenerator.Create(
Statement.Declaration.Declare("hello", typeof(int)).WithComment("My comment above").WithComment("hej"),
Statement.Declaration.Declare("hello", typeof(int)).WithComment("My comment to the side", CommentPosition.Right)))
.Build())
.Build();This code will generate following code:
using System;
namespace Models
{
public class Cat
{
public static MyMethod operator ++(string MyParameter)
{
//hej
int hello;
int hello; //My comment to the side
}
}
}Test class with method references
var @class = new ClassBuilder("NullTest", "MyTest")
.WithUsings("System", "NUnit.Framework")
.WithModifiers(Modifiers.Public)
.WithMethods(
new MethodBuilder("SetUp")
.WithAttributes(new Attribute("SetUp"))
.WithModifiers(Modifiers.Public)
.Build(),
new MethodBuilder("Test_WhenAddingNumber_ShouldBeCorrectSum")
.WithAttributes(new Attribute("Test"))
.WithModifiers(Modifiers.Public)
.WithBody(
BodyGenerator.Create(
Statement.Declaration.Declare("myList", typeof(List<int>)),
NunitAssertGenerator.Throws(new VariableReference("myList", new MethodReference("First")), typeof(ArgumentNullException))))
.Build())
.Build();This code will generate following code:
using System;
using NUnit.Framework;
namespace MyTest
{
public class NullTest
{
[SetUp]
public void SetUp()
{
}
[Test]
public void Test_WhenAddingNumber_ShouldBeCorrectSum()
{
List<int> myList;
Assert.Throws<ArgumentNullException>(() => myList.First(), "");
}
}
}Missing anything?
If we miss a feature, syntax or statements - just create an issue or contact us and I'm sure we can add it.
It is also possible for you to contribute with your own feature. Simply add a pull request and we will look at it.
License
This project is licensed under the MIT License. See the LICENSE.md file for details.
Contact
Visit www.testura.net, twitter at @testuranet or email at mille.bostrom@testura.net
