API cleanup

Currently the only way of creating a js is calling the cli interface. Even calling the underlying code is not working as it relays on global defined variables for cli. Also the compiler is only importable over a hack.

import tempfile
import sys
import os


def transcrypt_code(code):
    """
    The api is pretty messy so to get it working we create a tem file
    """
    import transcrypt

    transpilerDir = transcrypt.__path__._path[0]
    modulesDir = '{}/modules'.format(transpilerDir)

    # Both CPython and Transcrypt will use all dirs in sys.path as search roots for modules
    # CPython will also search relatively from each module, Transcrypt only
    # from the main module

    sys.path = [modulesDir] + sys.path
    sys.modules.pop('org', None)

    from org.transcrypt import compiler

    name = None

    with tempfile.NamedTemporaryFile() as f:
        name = f.name
        f.write(code.encode())

    compiler.Program(name)
    with open(os.path.join(
            os.path.dirname(name), "__javascript__",
            os.path.basename(name) + ".js")) as f:
        ret = f.read()
    return ret

if __name__ == "__main__":
    transcrypt_code("print('helo')")

This results in an error:

Traceback (most recent call last):
  File "trans.py", line 39, in <module>
    transcrypt_code("print('helo')")
  File "trans.py", line 30, in transcrypt_code
    compiler.Program(name)
  File "/tmp/env3/lib/python3.5/site-packages/transcrypt/modules/org/transcrypt/compiler.py", line 93, in __init__
    self.rawModuleCaption = '\n\n// ============ Source: {} ============\n\n' if utils.commandArgs.anno else ''
AttributeError: 'CommandArgs' object has no attribute 'anno'

[JdeH]

Indeed, if you want to invoke Transcrypt from a Python script, simply importing it doesn’t work. Invoking it is possible, but has to be done via the command line, as in shipment_test.py below. It’s admitted that this is less elegant than be able to call the compiler directly. I’ll register this as an enhancement.

import os
import webbrowser

shipDir = os.path.dirname (os.path.abspath (__file__)) .replace ('\\', '/')
rootDir = '/'.join  (shipDir.split ('/')[ : -2])

def getAbsPath (relPath):
    return '{}/{}'.format (rootDir, relPath)

def test (relPath, fileNamePrefix, run = False, switches = ''):
    os.chdir (getAbsPath (relPath))

    os.system ('run_transcrypt -b -m {}{}.py'.format (switches, fileNamePrefix))    

    if run:
        os.chdir (getAbsPath (relPath))
        os.system ('run_transcrypt -r {}.py'.format (fileNamePrefix))       

    webbrowser.open ('file://{}/{}.html'.format (getAbsPath (relPath), fileNamePrefix), new = 2)
    webbrowser.open ('file://{}/{}.min.html'.format (getAbsPath (relPath), fileNamePrefix), new = 2)

for fcallSwitch in ('', '-f '):
    test ('development/automated_tests/hello', 'autotest', True, fcallSwitch)
    test ('development/automated_tests/transcrypt', 'autotest', True, fcallSwitch)
    test ('demos/hello', 'hello', False, fcallSwitch)
    test ('demos/jquery_demo', 'jquery_demo', False, fcallSwitch)
    test ('demos/d3js_demo', 'd3js_demo', False, fcallSwitch)
    test ('demos/pong', 'pong', False, fcallSwitch)
    test ('demos/turtle_demos', 'star', False, fcallSwitch + '-p .user ')
    test ('demos/turtle_demos', 'snowflake', False, fcallSwitch + '-p .user ')

    if fcallSwitch:
        print ('Shipment test completed')
    else:
        input ('Close browser tabs opened by shipment test and press [enter] for fcall test')

[JdeH]

I don’t expect this to be handled anytime soon, so I’ve added the label postponed and will close it again. Motivation: #258. Postponed issues can easily be searched since they share the same label.