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Cross platform standard library #59

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gradha opened this issue Apr 11, 2015 · 11 comments
Open

Cross platform standard library #59

gradha opened this issue Apr 11, 2015 · 11 comments
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enhancement help wanted
Milestone
rusthon 2.0

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@gradha
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gradha commented Apr 11, 2015

The transpiled code seems to be highly backend dependant. Attempting something like a basic python slice already breaks c++ code:

def say_hi():
    print( 'hello world'[3:6])
==>
  File "./rusthon.py", line 539, in build
    pak = translate_to_cpp( pyjs, cached_json_files=cached_json )   ## pak contains: c_header and cpp_header
  File "<string>", line 13898, in translate_to_cpp
  File "<string>", line 1244, in visit
  File "<string>", line 13547, in visit_Module
  File "<string>", line 1244, in visit
  File "<string>", line 6341, in visit_FunctionDef
  File "<string>", line 12084, in _visit_function
  File "<string>", line 12212, in generate_generic_branches
  File "<string>", line 1244, in visit
  File "<string>", line 13723, in visit_Print
  File "<string>", line 1244, in visit
  File "<string>", line 10764, in visit_Subscript
__main__.GenerateSlice: {'upper': '6', 'lower': '3', 'slice': <_ast.Slice object at 0x102deabd0>, 'step': None, 'value': 'std::string("hello world")'}

Looks like to do some effective crossplatform program rusthon needs to reimplement a generic standard library which sometimes will map to the native standard library or implement some minimal code. Or maybe I have missed this support. Is it possible to write something like print(a.replace("h", "a")) and have it work on C++, Go, and Java?
@jcrubino
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This should be a priority and the standard tests can be built from this.
Where to start, Math, IO, Filesystem, OS?

@techtonik
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This crosses needs with a PyPy project, where a lot of new languages written in RPython could benefit from such library of functionality with a known behaviour.

@jcrubino
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Great observation

On Tue, Aug 18, 2015 at 5:23 AM, anatoly techtonik <notifications@github.com

wrote:

This crosses needs with a PyPy project, where a lot of new languages
written in RPython could benefit from such library with a known behaviour.

—
Reply to this email directly or view it on GitHub
#59 (comment).

@wolfv
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wolfv commented Nov 15, 2015

I would be interested in helping to create a python standard library for the JS backend. E.g. starting with math and random and then looking further to what needs to be done.

Would it make sense to create a repo under the rusthon umbrella for this purpose?

@techtonik
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Any cross-language / cross-platform library should start with some kind of language-independent tests of behavior.

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