evobasic-lang's Introduction

What is evoBasic

EvoBasic is a "evolution version" of classic visual basic,which aims to offer simple syntax and modern features.

It is an cross-platforms,object-oriented,strongly typed programming language, compiled to bytecode and run on evoBasic virtual machine.

Language manual

Features

Data encapsulation
Polymorphism
Inheritance
First-class functions

Syntax example

Function Fibonacci(Byval x as Integer) As Integer
	If x == 0 Then 
		Return 0
	ElseIf x == 1 Then
		Return 1
	Else
		Return Fibonacci(x - 1) + Fibonacci(x - 2)
	End if
End Function

Public Module UI
    Public Enum Message 
        Update = 1
        Resize
        Hide
    End Enum

    Public Interface MessageReciver
         Function OnMessage(Byval msg as Message,Optional ByRef sender as UIObject) As Boolean
    End Interface

    Private Type Position
        x As Integer
        Y as Integer
    End Type

    Public Class Button Impl MessageReciver
        Private pos As Position
        Public Override Function OnMessage(Byval msg as Message,Optional ByRef sender as UIObject) As Boolean
            // process message...
        End Function
    End Class
End Module

Sub Main()
    Dim btn As UI.Button, msg As UI.Message
    btn = New UI.Button
    msg = UI.Message.Update
    btn.OnMessage(msg)
End Sub

For a complete definition about syntax, see grammar.bnf.

Project status

lexer and parser: generate parse tree
semantic check: type check,generate symbol table and translate parse tree to abstract tree
IL generator: translate abstract tree to intermediate language
package file (.bkg) generator and loader
package manager
evoBasic vm

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