VB6 - Visual Basic 6

https://en.wikipedia.org/wiki/Visual_Basic_(classic)
https://en.wikipedia.org/wiki/BASIC

BASIC = Beginner's All-purpose Symbolic Instruction Code

At least for the people who send me mail about a new language that they're designing, the general advice is: do it to learn about how to write a compiler. Don't have any expectations that anyone will use it, unless you hook up with some sort of organization in a position to push it hard. It's a lottery, and some can buy a lot of the tickets. There are plenty of beautiful languages (more beautiful than C) that didn't catch on. But someone does win the lottery, and doing a language at least teaches you something.
Dennis Ritchie (1941-2011)
Creator of the C programming language and of Unix

Press

Visual Basic 6 Renewed to Run on Windows 8
https://www.infoq.com/news/2012/02/vb6_supported_on_win8

Complete VB6 Grammars

ANTLR4-based Grammars

https://github.com/antlr/grammars-v4/tree/master/vb6

https://github.com/uwol/vb6parser
https://github.com/uwol/vb6parser/blob/master/src/main/antlr4/io/proleap/vb6/VisualBasic6.g4

Grammar Zoo: http://slebok.github.io/zoo/index.html

http://boost.2283326.n4.nabble.com/Parser-operator-Difference-td4675788.html

Expression Parsing

https://en.wikipedia.org/wiki/Operator-precedence_parser

CodeProject Articles

Crafting an interpreter Part 1 - Parsing and Grammars
https://www.codeproject.com/Articles/10115/Crafting-an-interpreter-Part-1-Parsing-and-Grammar \

Visual Basic 6.0: A giant more powerful than ever
https://www.codeproject.com/Articles/710181/Visual-Basic-6-0-A-giant-more-powerful-than-ever

Misc

Grako (grammar compiler) is a tool that takes grammars in a variation of EBNF as input, and outputs memoizing (Packrat) PEG parsers in Python.
A generator of PEG/Packrat parsers from EBNF grammars.
https://pypi.python.org/pypi/grako/

TatSu is a tool that takes grammars in a variation of EBNF as input, and outputs memoizing (Packrat) PEG parsers in Python.
https://pypi.org/project/TatSu/

GOLD Parsing System
http://goldparser.org/engine/1/vb6/index.htm
http://goldparser.org/about/comparison-parsers.htm

http://www.eclipse.org/gmt/modisco/technologies/VisualBasic/#download

https://tomassetti.me/how-to-write-a-transpiler/

The vb2Py project is developing a suite of conversion tools to aid in translating Visual Basic projects into Python.
http://vb2py.sourceforge.net/index.html

http://vb6awards.blogspot.com/2016/04/microsoft-update-or-open-source-vb6.html

VB6 Named parameters

Function foo(Optional val1 = 1, Optional val2 = 2, Optional val3 = 3)
    MsgBox "val1: " & val1 & " val2: " & val2 & " val3: " & val3
    foo = val3
End Function

Private Sub Form_Load()
    MsgBox "foo returned: " & foo(val3:=4)
End Sub

VB6 Dot notation (x.y)

Access to members of

Modules
Classes, forms, controls
Types

Types of members

Data members
Member functions
Member subroutines
Properties

module.variable
module.function
module.subroutine
module.enum
module.type

object.variable
object.function
object.subroutine
object.property

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