vlang/py2v

A Python to V transpiler.

py2v

py2v is a Python to V source transpiler written (mostly) in V. py2v aims not to have a bug-to-bug 100% accurate transpilation but to create a baseline to ease re-making Python projects in V.

Please see the examples folder to see the least py2v can do.

Installation

Dependencies:

• V
• Python 3.6+

git clone https://github.com/vlang/py2v.git
cd py2v
<path to V> -prod py2v.v -o py2v

Usage

./py2v <Python input file> <V output file>

Contributing

PRs are welcome. Please prefix your PR titles with the component you are editing. (docs: improve README.md etc.)

License

MIT License

py2v's Issues

building says module v.table dose not exist

The module doesn't exist in vlib modules. It looks like it is used a lot and I don't know were it comes from.

Add error handling

Something wrong with converting input() in python to os.input() in V

used py code

inp = input(">> ")
print(inp)

and got output v

mut inp := input('>> ')
println(inp)

"input()" in output should be os.input()

Improve documentation

Does not build due to v changes.

Something wrong with True and False

If you set a variable to True it says "none" in place of it in the v file.

Deprecated Map Syntax

Using v run py2v.v ~/myfile.py raises the following error:

json2v/json2v.v:12:14: error: deprecated map syntax, use syntax like `{'age': 20}`
   10 | 
   11 | const (
   12 |     operators = map{
      |                 ~~~
   13 |         'LShift': token.Kind.left_shift
   14 |         'RShift': token.Kind.right_shift

Add vfmt to CI

Something wrong with or

Using or in an if statement makes the if statement not get translated.

Can't run on mac because of apples weird permissions

The terminal output is.

  File "ast2json.py", line 33
    print(f'USAGE: {sys.argv[0]} <source> <destination>')
                                                       ^
SyntaxError: invalid syntax
V panic: optional not set (failed to open file "/tmp/ast2json.temp.json")
v hash: d0100fa
0   libdyld.dylib                       0x000000018548d450 start + 4

Haven't looked into the code much so I have no idea what this means.

Also, I don't know how to read v errors.

Looks like it can't open the file or can't find it. I do know this project creates a file in /tmp. I checked it's not there.

Contibuting

How can I help with the development of this project? I have experience in Python and I have enthusiasm to be useful in developing V.
Maybe it makes sense to describe a list of tasks?

long build warning with newest version of v

json2v/json2v.v:3:8: warning: module 'os' is imported but never used
    1 | module json2v
    2 | 
    3 | import os
      |        ~~
    4 | import v.ast
    5 | //import v.checker
json2v/json2v.v:392:79: notice: direct sum type init (`x := SumType{}`) will be removed soon
  390 |                     mut ident := e as ast.Ident // FIX: assignment on to a function parameter with a default value will break this cast
  391 |                     typ := t.get_type(right[i])
  392 |                     mut scope_obj, mut scope := t.scope.find_with_scope(ident.name) or { ast.ScopeObject{}, &ast.Scope{parent: 0} }
      |                                                                                              ~~~~~~~~~~~~~
  393 |                     match scope_obj {
  394 |                         ast.Var {
json2v/json2v.v:392:79: notice: direct sum type init (`x := SumType{}`) will be removed soon
  390 |                     mut ident := e as ast.Ident // FIX: assignment on to a function parameter with a default value will break this cast
  391 |                     typ := t.get_type(right[i])
  392 |                     mut scope_obj, mut scope := t.scope.find_with_scope(ident.name) or { ast.ScopeObject{}, &ast.Scope{parent: 0} }
      |                                                                                              ~~~~~~~~~~~~~
  393 |                     match scope_obj {
  394 |                         ast.Var {
json2v/json2v.v:392:79: notice: direct sum type init (`x := SumType{}`) will be removed soon
  390 |                     mut ident := e as ast.Ident // FIX: assignment on to a function parameter with a default value will break this cast
  391 |                     typ := t.get_type(right[i])
  392 |                     mut scope_obj, mut scope := t.scope.find_with_scope(ident.name) or { ast.ScopeObject{}, &ast.Scope{parent: 0} }
      |                                                                                              ~~~~~~~~~~~~~
  393 |                     match scope_obj {
  394 |                         ast.Var {
json2v/json2v.v:392:79: notice: direct sum type init (`x := SumType{}`) will be removed soon
  390 |                     mut ident := e as ast.Ident // FIX: assignment on to a function parameter with a default value will break this cast
  391 |                     typ := t.get_type(right[i])
  392 |                     mut scope_obj, mut scope := t.scope.find_with_scope(ident.name) or { ast.ScopeObject{}, &ast.Scope{parent: 0} }
      |                                                                                              ~~~~~~~~~~~~~
  393 |                     match scope_obj {
  394 |                         ast.Var {

Looks like the script is soon going to be unsupported. Might have to fix these.

While does not work

Using while in a converted script does not convert the while statement.

No instructions on building in readme