pseudo-lang/pseudo

transpile algorithms/libs to idiomatic JS, Go, C#, Ruby

pseudo's Issues

Notions of side-effecting/monads?

I've been playing around with similar ideas recently and was considering what kind of information you'd need to encode the same logic that could be transpiled to Java as well as Haskell. Have you thought at all about AST decorations that would indicate, for example, that something would need access to IO to execute?

Why has dev stalled?

Is it merely the usual reason (time/money), or have you, to some extent, lost confidence in the ideas?
I think many of the 625 people who starred this project, including myself, would be grateful to hear what your current thinking on it is.

I see that your using Nim now. I was recently reading the Nim docs and was very impressed. I told my boss: "it seems to have all the good parts of Scala, without the annoying dependence on Java". (note: I'm aware of Scala Native, and the main codebase I work on currently complies with its requirements, but in doing so forgoes the use of many popular Scala libraries, which tend to use new language features as soon as they're available).

Perhaps you are satisfied enough with Nim and Python as your go-to languages to abandon the more-ambitious/idealistic goals of Pseudo? I can imagine myself going down that path (abandoning my ideas that are similar to yours for Pseudo).

Application idea: css-layout

Hey! This is a really cool project. I've been considering something similar but ended up using regexes in order to translate a subset of javascript to c, java and c#: https://github.com/facebook/css-layout

Not really sure how you plan to use this but if you need a use case, I think that css-layout is a good one. It is non trivial but not that hard, already exists and is being used in production.

Error in generating boolean literal in ruby

test.py:

a = True
b = False

Generate test.rb by executing $ pseudo-python test.py test.rb

Generated test.rb:

a = True
b = False

Expected test.rb:

a = true
b = false

Enhancement Suggestion : PHP

Documentation

Document what can Pseudo do and translate several example programs, combine with pseudo-python

• Examples
• Pseudo

Add support to convert/parse go code to Pseudo AST?

... this would allow for some of porting from Go to Python, etc,...

Ruby – generate attr_accessor for ivars

Input

class Barney:
  def __init__(self):
    self.status = 'not ok'
barney = Barney()
barney.status = "ok"
print(barney.status)

Output

class Barney
  def initialize
    @status = 'not ok'
  end

end

barney = Barney.new
barney.status = 'ok'
puts barney.status

Error

undefined method status=' for #<Barney:0x007f837084d190 @status="not ok"> (NoMethodError)`

Dead link in README

I guess:
https://github.com/alehander42/pseudo/blob/master/pseudo/tests/test_ruby.py
should be:
https://github.com/alehander42/pseudo/blob/master/tests/test_ruby.py

Parenthesise operators if necessary

In Python the not operator has low precedence. In JS the ! operator has high precedence.

To be on the safe side, generators should wrap all operators in parens by default, and only remove them if the generator can prove there is no precedence/associativity issue. Otherwise you'll get issues with things like PHP's weird-ass left associative ternary operator.

Input (Python):

not 0.1 > 0.1

Expected output (JavaScript):

!(0.1 > 0.1)

Actual output (JavaScript):

!0.1 > 0.1

Convert tuples to classes in C#

Tuples don't feel very C# in some cases.
Use a middleware to detect suitable names for the tuples and their fields in the AST and if detected, generate a class with readonly fields for them and convert the index accesses to attr accesses

(based on angelvenchev and bella92 feedback)

JSTranslator doesn't have a String#include? method

Trying to translate this Python program to JS:

string = "test"

if "test" in string:
   print("positive")

What I get is:
Pseudo error:
JSTranslator doesn't have a String#include? method

Standard library

• Document API in docs/library_reference.md
• Implement api translation for supported methods
  • Python
  • Ruby
  • C#
  • JavaScript
  • Go

can't change the type of variable string in global scope from String to List[String]

Trying to translate this Python program to JS:

string = "I am fine"

string = string.split(" ")

string = string[0]

What I get is:
can't change the type of variable string in global scope from String to List[String]

Proposing a PR to fix a few small typos

Issue Type

[x] Bug (Typo)

Steps to Replicate and Expected Behaviour

• Examine docs/ast.md, pseudo/init.py and observe translateable, however expect to see translatable.
• Examine README.md and observe targetting, however expect to see targeting.
• Examine docs/ruby.md and observe magnificient, however expect to see magnificent.
• Examine tests/test_python.py and observe compatibillity, however expect to see compatibility.

Notes

Semi-automated issue generated by
https://github.com/timgates42/meticulous/blob/master/docs/NOTE.md

To avoid wasting CI processing resources a branch with the fix has been
prepared but a pull request has not yet been created. A pull request fixing
the issue can be prepared from the link below, feel free to create it or
request @timgates42 create the PR.

https://github.com/timgates42/pseudo/pull/new/bugfix_typos

Thanks.

Error in converting python list comprehension

test.py:

a = [x + 1 for x in [1, 2, 3]]

test.pseudo.yaml:

constants: []
custom_exceptions: []
definitions: []
dependencies: []
main:
- pseudo_type: Void
  target:
    name: a
    pseudo_type: [List, Int]
    type: local
  type: assignment
  value:
    block:
    - left: {name: x, pseudo_type: Int, type: local}
      op: +
      pseudo_type: Int
      right: {pseudo_type: Int, type: int, value: 1}
      type: binary_op
    function: map
    iterators:
      iterator: {name: x, pseudo_type: Int, type: local}
      type: for_iterator
    pseudo_type: [List, Int]
    sequences:
      sequence:
        elements:
        - {pseudo_type: Int, type: int, value: 1}
        - {pseudo_type: Int, type: int, value: 2}
        - {pseudo_type: Int, type: int, value: 3}
        pseudo_type: [List, Int]
        type: list
      type: for_sequence
    type: standard_iterable_call
type: module

When executing $ pseudo test.pseudo.yaml py, the following error occurs:

Traceback (most recent call last):
  File "/usr/local/bin/pseudo", line 11, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.5/site-packages/pseudo/main.py", line 43, in main
    output_source = pseudo.generate(pseudo.loader.as_tree(intermediate_code), format)
  File "/usr/local/lib/python3.5/site-packages/pseudo/__init__.py", line 106, in generate
    return GENERATORS[language]().generate(translated_ast)
  File "/usr/local/lib/python3.5/site-packages/pseudo/code_generator.py", line 44, in generate
    original = self._generate_node(tree)
  File "/usr/local/lib/python3.5/site-packages/pseudo/code_generator.py", line 156, in _generate_node
    return self._generate_from_template(self._parsed_templates[node.type], node, depth)
  File "/usr/local/lib/python3.5/site-packages/pseudo/code_generator.py", line 210, in _generate_from_template
    expanded.append(element.expand(self, node, depth))
  File "/usr/local/lib/python3.5/site-packages/pseudo/code_generator_dsl.py", line 69, in expand
    expanded = [generator._generate_node(content[0], depth)]
  File "/usr/local/lib/python3.5/site-packages/pseudo/code_generator.py", line 156, in _generate_node
    return self._generate_from_template(self._parsed_templates[node.type], node, depth)
  File "/usr/local/lib/python3.5/site-packages/pseudo/code_generator.py", line 210, in _generate_from_template
    expanded.append(element.expand(self, node, depth))
  File "/usr/local/lib/python3.5/site-packages/pseudo/code_generator_dsl.py", line 29, in expand
    return generator._generate_node(content, depth)
  File "/usr/local/lib/python3.5/site-packages/pseudo/code_generator.py", line 156, in _generate_node
    return self._generate_from_template(self._parsed_templates[node.type], node, depth)
  File "/usr/local/lib/python3.5/site-packages/pseudo/code_generator.py", line 210, in _generate_from_template
    expanded.append(element.expand(self, node, depth))
  File "/usr/local/lib/python3.5/site-packages/pseudo/code_generator_dsl.py", line 63, in expand
    content = getattr(node, self.field)
AttributeError: 'Node' object has no attribute 'test'

Starargs sugar for Python and Ruby

When

<call>(a, b, .. z[0], z[1]..z[<zlength - 1>])

and z is a Tuple / Array , generate

<call>(a, b, *z>)

Eventually, for z[k]..z[l] generate <call>(a, b, *z[k..l])

"[Every language other than C#] doesn't have a List#concat method"

To replicate:

>cat add_two_arrays.py

def add_two_arrays(arrayA, arrayB):
  return arrayA + arrayB

print(add_two_arrays([1,2,3], [4,5,6])) 

>pseudo-python add_two_arrays.py
OK
saved pseudo ast as add_two_arrays.pseudo.yaml

>pseudo add_two_arrays.pseudo.yaml go

Traceback (most recent call last):
  File "/usr/local/bin/pseudo", line 11, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.6/site-packages/pseudo/main.py", line 44, in main
    output_source = pseudo.generate_from_yaml(intermediate_code, format)
  File "/usr/local/lib/python3.6/site-packages/pseudo/__init__.py", line 97, in generate_from_yaml
    return pseudo.generate(pseudo.loader.as_tree(pseudo_ast), language)
  File "/usr/local/lib/python3.6/site-packages/pseudo/__init__.py", line 116, in generate
    translated_ast = API_TRANSLATORS[language](pseudo_ast).api_translate()
  File "/usr/local/lib/python3.6/site-packages/pseudo/api_translator.py", line 81, in api_translate
    transformed = self.transform(self.tree)
  File "/usr/local/lib/python3.6/site-packages/pseudo/tree_transformer.py", line 34, in transform
    tree = self.transform_default(tree)
  File "/usr/local/lib/python3.6/site-packages/pseudo/tree_transformer.py", line 54, in transform_default
    setattr(tree, field, self.transform(child))
  File "/usr/local/lib/python3.6/site-packages/pseudo/tree_transformer.py", line 41, in transform
    return [self.transform(child) for child in tree]
  File "/usr/local/lib/python3.6/site-packages/pseudo/tree_transformer.py", line 41, in <listcomp>
    return [self.transform(child) for child in tree]
  File "/usr/local/lib/python3.6/site-packages/pseudo/tree_transformer.py", line 34, in transform
    tree = self.transform_default(tree)
  File "/usr/local/lib/python3.6/site-packages/pseudo/tree_transformer.py", line 52, in transform_default
    setattr(tree, field, self.transform_block(child))
  File "/usr/local/lib/python3.6/site-packages/pseudo/tree_transformer.py", line 60, in transform_block
    result = self.transform(child, True)
  File "/usr/local/lib/python3.6/site-packages/pseudo/tree_transformer.py", line 34, in transform
    tree = self.transform_default(tree)
  File "/usr/local/lib/python3.6/site-packages/pseudo/tree_transformer.py", line 50, in transform_default
    setattr(tree, field, self.transform(child, False, tree if tree.type[-10:] == 'assignment' else None))
  File "/usr/local/lib/python3.6/site-packages/pseudo/tree_transformer.py", line 32, in transform
    tree = handler(tree, in_block, assignment)
  File "/usr/local/lib/python3.6/site-packages/pseudo/api_translator.py", line 148, in transform_standard_method_call
    '%s doesn\'t have a %s#%s method' % (type(self).__name__, l, node.message))
pseudo.errors.PseudoStandardLibraryError: GolangTranslator doesn't have a List#concat method

You get this same error for C++, Ruby, JS and Python. Only C# is able to handle List#concat properly, and I am able to generate human-readable C# code using pseudo.