tools: Add gen-cpydiff.py to generate docs differences.

This patch introduces the a small framework to track differences between
uPy and CPython.  The framework consists of:

- A set of "tests" which test for an individual feature that differs between
  uPy and CPy.  Each test is like a normal uPy test in the test suite, but
  has a special comment at the start with some meta-data: a category (eg
  syntax, core language), a human-readable description of the difference, a
  cause, and a workaround.  Following the meta-data there is a short code
  snippet which demonstrates the difference.  See tests/cpydiff directory
  for the initial set of tests.

- A program (this patch) which runs all the tests (on uPy and CPy) and
  generates nicely-formated .rst documenting the differences.

- Integration into the docs build so that everything is automatic, and the
  differences appear in a way that is easy for users to read/reference (see
  latter commits).

The idea with using this new framework is:

- When a new difference is found it's easy to write a short test for it,
  along with a description, and add it to the existing ones.  It's also easy
  for contributors to submit tests for differences they find.

- When something is no longer different the tool will give an error and
  difference can be removed (or promoted to a proper feature test).
crypto-aes
Rami Ali 6 years ago committed by Damien George
parent 86c7507233
commit b7fa63c7ce
  1. 8
      docs/differences/index_template.txt
  2. 213
      tools/gen-cpydiff.py

@ -0,0 +1,8 @@
MicroPython Differences from CPython
====================================
The operations listed in this section produce conflicting results in MicroPython when compared to standard Python.
.. toctree::
:maxdepth: 2

@ -0,0 +1,213 @@
# This file is part of the MicroPython project, http://micropython.org/
#
# The MIT License (MIT)
#
# Copyright (c) 2016 Rami Ali
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
""" gen-cpydiff generates documentation which outlines operations that differ between MicroPython
and CPython. This script is called by the docs Makefile for html and Latex and may be run
manually using the command make gen-cpydiff. """
import os
import errno
import subprocess
import time
import re
from collections import namedtuple
TESTPATH = '../tests/cpydiff/'
UPYPATH = '../unix/micropython'
DOCPATH = '../docs/genrst/'
INDEXTEMPLATE = '../docs/differences/index_template.txt'
INDEX = 'index.rst'
HEADER = '.. This document was generated by tools/gen-cpydiff.py\n\n'
UIMPORTLIST = {'struct', 'collections', 'json'}
CLASSMAP = {'Core': 'Core Language', 'Types': 'Builtin Types'}
INDEXPRIORITY = ['syntax', 'core_language', 'builtin_types', 'modules']
RSTCHARS = ['=', '-', '~', '`', ':']
SPLIT = '"""\n|categories: |description: |cause: |workaround: '
TAB = ' '
Output = namedtuple('output', ['name', 'class_', 'desc', 'cause', 'workaround', 'code',
'output_cpy', 'output_upy', 'status'])
def readfiles():
""" Reads test files """
tests = list(filter(lambda x: x.endswith('.py'), os.listdir(TESTPATH)))
tests.sort()
files = []
for test in tests:
text = open(TESTPATH + test, 'r').read()
try:
class_, desc, cause, workaround, code = [x.rstrip() for x in \
list(filter(None, re.split(SPLIT, text)))]
output = Output(test, class_, desc, cause, workaround, code, '', '', '')
files.append(output)
except IndexError:
print('Incorrect format in file ' + TESTPATH + test)
return files
def uimports(code):
""" converts CPython module names into MicroPython equivalents """
for uimport in UIMPORTLIST:
uimport = bytes(uimport, 'utf8')
code = code.replace(uimport, b'u' + uimport)
return code
def run_tests(tests):
""" executes all tests """
results = []
for test in tests:
with open(TESTPATH + test.name, 'rb') as f:
input_cpy = f.read()
input_upy = uimports(input_cpy)
process = subprocess.Popen('python', shell=True, stdout=subprocess.PIPE, stdin=subprocess.PIPE, stderr=subprocess.PIPE)
output_cpy = [com.decode('utf8') for com in process.communicate(input_cpy)]
process = subprocess.Popen(UPYPATH, shell=True, stdout=subprocess.PIPE, stdin=subprocess.PIPE, stderr=subprocess.PIPE)
output_upy = [com.decode('utf8') for com in process.communicate(input_upy)]
if output_cpy[0] == output_upy[0] and output_cpy[1] == output_upy[1]:
status = 'Supported'
print('Supported operation!\nFile: ' + TESTPATH + test.name)
else:
status = 'Unsupported'
output = Output(test.name, test.class_, test.desc, test.cause,
test.workaround, test.code, output_cpy, output_upy, status)
results.append(output)
results.sort(key=lambda x: x.class_)
return results
def indent(block, spaces):
""" indents paragraphs of text for rst formatting """
new_block = ''
for line in block.split('\n'):
new_block += spaces + line + '\n'
return new_block
def gen_table(contents):
""" creates a table given any set of columns """
xlengths = []
ylengths = []
for column in contents:
col_len = 0
for entry in column:
lines = entry.split('\n')
for line in lines:
col_len = max(len(line) + 2, col_len)
xlengths.append(col_len)
for i in range(len(contents[0])):
ymax = 0
for j in range(len(contents)):
ymax = max(ymax, len(contents[j][i].split('\n')))
ylengths.append(ymax)
table_divider = '+' + ''.join(['-' * i + '+' for i in xlengths]) + '\n'
table = table_divider
for i in range(len(ylengths)):
row = [column[i] for column in contents]
row = [entry + '\n' * (ylengths[i]-len(entry.split('\n'))) for entry in row]
row = [entry.split('\n') for entry in row]
for j in range(ylengths[i]):
k = 0
for entry in row:
width = xlengths[k]
table += ''.join(['| {:{}}'.format(entry[j], width - 1)])
k += 1
table += '|\n'
table += table_divider
return table + '\n'
def gen_rst(results):
""" creates restructured text documents to display tests """
# make sure the destination directory exists
try:
os.mkdir(DOCPATH)
except OSError as e:
if e.args[0] != errno.EEXIST and e.args[0] != errno.EISDIR:
raise
toctree = []
class_ = []
for output in results:
section = output.class_.split(',')
for i in range(len(section)):
section[i] = section[i].rstrip()
if section[i] in CLASSMAP:
section[i] = CLASSMAP[section[i]]
if i >= len(class_) or section[i] != class_[i]:
if i == 0:
filename = section[i].replace(' ', '_').lower()
rst = open(DOCPATH + filename + '.rst', 'w')
rst.write(HEADER)
rst.write(section[i] + '\n')
rst.write(RSTCHARS[0] * len(section[i]))
rst.write(time.strftime("\nGenerated %a %d %b %Y %X UTC\n\n", time.gmtime()))
toctree.append(filename)
else:
rst.write(section[i] + '\n')
rst.write(RSTCHARS[min(i, len(RSTCHARS)-1)] * len(section[i]))
rst.write('\n\n')
class_ = section
rst.write('**' + output.desc + '**\n\n')
if output.cause != 'Unknown':
rst.write('**Cause:** ' + output.cause + '\n\n')
if output.workaround != 'Unknown':
rst.write('**Workaround:** ' + output.workaround + '\n\n')
rst.write('Sample code::\n\n' + indent(output.code, TAB) + '\n')
output_cpy = indent(''.join(output.output_cpy[0:2]), TAB).rstrip()
output_cpy = ('::\n\n' if output_cpy != '' else '') + output_cpy
output_upy = indent(''.join(output.output_upy[0:2]), TAB).rstrip()
output_upy = ('::\n\n' if output_upy != '' else '') + output_upy
table = gen_table([['CPy output:', output_cpy], ['uPy output:', output_upy]])
rst.write(table)
template = open(INDEXTEMPLATE, 'r')
index = open(DOCPATH + INDEX, 'w')
index.write(HEADER)
index.write(template.read())
for section in INDEXPRIORITY:
if section in toctree:
index.write(indent(section + '.rst', TAB))
toctree.remove(section)
for section in toctree:
index.write(indent(section + '.rst', TAB))
def main():
""" Main function """
# clear search path to make sure tests use only builtin modules
os.environ['MICROPYPATH'] = ''
files = readfiles()
results = run_tests(files)
gen_rst(results)
main()
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