unix-cpy: Remove unix-cpy. It's no longer needed.

unix-cpy was originally written to get semantic equivalent with CPython
without writing functional tests.  When writing the initial
implementation of uPy it was a long way between lexer and functional
tests, so the half-way test was to make sure that the bytecode was
correct.  The idea was that if the uPy bytecode matched CPython 1-1 then
uPy would be proper Python if the bytecodes acted correctly.  And having
matching bytecode meant that it was less likely to miss some deep
subtlety in the Python semantics that would require an architectural
change later on.

But that is all history and it no longer makes sense to retain the
ability to output CPython bytecode, because:

1. It outputs CPython 3.3 compatible bytecode.  CPython's bytecode
changes from version to version, and seems to have changed quite a bit
in 3.5.  There's no point in changing the bytecode output to match
CPython anymore.

2. uPy and CPy do different optimisations to the bytecode which makes it
harder to match.

3. The bytecode tests are not run.  They were never part of Travis and
are not run locally anymore.

4. The EMIT_CPYTHON option needs a lot of extra source code which adds
heaps of noise, especially in compile.c.

5. Now that there is an extensive test suite (which tests functionality)
there is no need to match the bytecode.  Some very subtle behaviour is
tested with the test suite and passing these tests is a much better
way to stay Python-language compliant, rather than trying to match
CPy bytecode.

1 files changed, 0 insertions, 247 deletions

diff --git a/tests/bytecode/pylib-tests/pipes.py b/tests/bytecode/pylib-tests/pipes.py
deleted file mode 100644
index f1a16f63de..0000000000
--- a/tests/bytecode/pylib-tests/pipes.py
+++ /dev/null
@@ -1,247 +0,0 @@
-"""Conversion pipeline templates.
-
-The problem:
-------------
-
-Suppose you have some data that you want to convert to another format,
-such as from GIF image format to PPM image format.  Maybe the
-conversion involves several steps (e.g. piping it through compress or
-uuencode).  Some of the conversion steps may require that their input
-is a disk file, others may be able to read standard input; similar for
-their output.  The input to the entire conversion may also be read
-from a disk file or from an open file, and similar for its output.
-
-The module lets you construct a pipeline template by sticking one or
-more conversion steps together.  It will take care of creating and
-removing temporary files if they are necessary to hold intermediate
-data.  You can then use the template to do conversions from many
-different sources to many different destinations.  The temporary
-file names used are different each time the template is used.
-
-The templates are objects so you can create templates for many
-different conversion steps and store them in a dictionary, for
-instance.
-
-
-Directions:
------------
-
-To create a template:
-    t = Template()
-
-To add a conversion step to a template:
-   t.append(command, kind)
-where kind is a string of two characters: the first is '-' if the
-command reads its standard input or 'f' if it requires a file; the
-second likewise for the output. The command must be valid /bin/sh
-syntax.  If input or output files are required, they are passed as
-$IN and $OUT; otherwise, it must be  possible to use the command in
-a pipeline.
-
-To add a conversion step at the beginning:
-   t.prepend(command, kind)
-
-To convert a file to another file using a template:
-  sts = t.copy(infile, outfile)
-If infile or outfile are the empty string, standard input is read or
-standard output is written, respectively.  The return value is the
-exit status of the conversion pipeline.
-
-To open a file for reading or writing through a conversion pipeline:
-   fp = t.open(file, mode)
-where mode is 'r' to read the file, or 'w' to write it -- just like
-for the built-in function open() or for os.popen().
-
-To create a new template object initialized to a given one:
-   t2 = t.clone()
-"""                                     # '
-
-
-import re
-import os
-import tempfile
-# we import the quote function rather than the module for backward compat
-# (quote used to be an undocumented but used function in pipes)
-from shlex import quote
-
-__all__ = ["Template"]
-
-# Conversion step kinds
-
-FILEIN_FILEOUT = 'ff'                   # Must read & write real files
-STDIN_FILEOUT  = '-f'                   # Must write a real file
-FILEIN_STDOUT  = 'f-'                   # Must read a real file
-STDIN_STDOUT   = '--'                   # Normal pipeline element
-SOURCE         = '.-'                   # Must be first, writes stdout
-SINK           = '-.'                   # Must be last, reads stdin
-
-stepkinds = [FILEIN_FILEOUT, STDIN_FILEOUT, FILEIN_STDOUT, STDIN_STDOUT, \
-             SOURCE, SINK]
-
-
-class Template:
-    """Class representing a pipeline template."""
-
-    def __init__(self):
-        """Template() returns a fresh pipeline template."""
-        self.debugging = 0
-        self.reset()
-
-    def __repr__(self):
-        """t.__repr__() implements repr(t)."""
-        return '<Template instance, steps=%r>' % (self.steps,)
-
-    def reset(self):
-        """t.reset() restores a pipeline template to its initial state."""
-        self.steps = []
-
-    def clone(self):
-        """t.clone() returns a new pipeline template with identical
-        initial state as the current one."""
-        t = Template()
-        t.steps = self.steps[:]
-        t.debugging = self.debugging
-        return t
-
-    def debug(self, flag):
-        """t.debug(flag) turns debugging on or off."""
-        self.debugging = flag
-
-    def append(self, cmd, kind):
-        """t.append(cmd, kind) adds a new step at the end."""
-        if type(cmd) is not type(''):
-            raise TypeError('Template.append: cmd must be a string')
-        if kind not in stepkinds:
-            raise ValueError('Template.append: bad kind %r' % (kind,))
-        if kind == SOURCE:
-            raise ValueError('Template.append: SOURCE can only be prepended')
-        if self.steps and self.steps[-1][1] == SINK:
-            raise ValueError('Template.append: already ends with SINK')
-        if kind[0] == 'f' and not re.search(r'\$IN\b', cmd):
-            raise ValueError('Template.append: missing $IN in cmd')
-        if kind[1] == 'f' and not re.search(r'\$OUT\b', cmd):
-            raise ValueError('Template.append: missing $OUT in cmd')
-        self.steps.append((cmd, kind))
-
-    def prepend(self, cmd, kind):
-        """t.prepend(cmd, kind) adds a new step at the front."""
-        if type(cmd) is not type(''):
-            raise TypeError('Template.prepend: cmd must be a string')
-        if kind not in stepkinds:
-            raise ValueError('Template.prepend: bad kind %r' % (kind,))
-        if kind == SINK:
-            raise ValueError('Template.prepend: SINK can only be appended')
-        if self.steps and self.steps[0][1] == SOURCE:
-            raise ValueError('Template.prepend: already begins with SOURCE')
-        if kind[0] == 'f' and not re.search(r'\$IN\b', cmd):
-            raise ValueError('Template.prepend: missing $IN in cmd')
-        if kind[1] == 'f' and not re.search(r'\$OUT\b', cmd):
-            raise ValueError('Template.prepend: missing $OUT in cmd')
-        self.steps.insert(0, (cmd, kind))
-
-    def open(self, file, rw):
-        """t.open(file, rw) returns a pipe or file object open for
-        reading or writing; the file is the other end of the pipeline."""
-        if rw == 'r':
-            return self.open_r(file)
-        if rw == 'w':
-            return self.open_w(file)
-        raise ValueError('Template.open: rw must be \'r\' or \'w\', not %r'
-                         % (rw,))
-
-    def open_r(self, file):
-        """t.open_r(file) and t.open_w(file) implement
-        t.open(file, 'r') and t.open(file, 'w') respectively."""
-        if not self.steps:
-            return open(file, 'r')
-        if self.steps[-1][1] == SINK:
-            raise ValueError('Template.open_r: pipeline ends width SINK')
-        cmd = self.makepipeline(file, '')
-        return os.popen(cmd, 'r')
-
-    def open_w(self, file):
-        if not self.steps:
-            return open(file, 'w')
-        if self.steps[0][1] == SOURCE:
-            raise ValueError('Template.open_w: pipeline begins with SOURCE')
-        cmd = self.makepipeline('', file)
-        return os.popen(cmd, 'w')
-
-    def copy(self, infile, outfile):
-        return os.system(self.makepipeline(infile, outfile))
-
-    def makepipeline(self, infile, outfile):
-        cmd = makepipeline(infile, self.steps, outfile)
-        if self.debugging:
-            print(cmd)
-            cmd = 'set -x; ' + cmd
-        return cmd
-
-
-def makepipeline(infile, steps, outfile):
-    # Build a list with for each command:
-    # [input filename or '', command string, kind, output filename or '']
-
-    list = []
-    for cmd, kind in steps:
-        list.append(['', cmd, kind, ''])
-    #
-    # Make sure there is at least one step
-    #
-    if not list:
-        list.append(['', 'cat', '--', ''])
-    #
-    # Take care of the input and output ends
-    #
-    [cmd, kind] = list[0][1:3]
-    if kind[0] == 'f' and not infile:
-        list.insert(0, ['', 'cat', '--', ''])
-    list[0][0] = infile
-    #
-    [cmd, kind] = list[-1][1:3]
-    if kind[1] == 'f' and not outfile:
-        list.append(['', 'cat', '--', ''])
-    list[-1][-1] = outfile
-    #
-    # Invent temporary files to connect stages that need files
-    #
-    garbage = []
-    for i in range(1, len(list)):
-        lkind = list[i-1][2]
-        rkind = list[i][2]
-        if lkind[1] == 'f' or rkind[0] == 'f':
-            (fd, temp) = tempfile.mkstemp()
-            os.close(fd)
-            garbage.append(temp)
-            list[i-1][-1] = list[i][0] = temp
-    #
-    for item in list:
-        [inf, cmd, kind, outf] = item
-        if kind[1] == 'f':
-            cmd = 'OUT=' + quote(outf) + '; ' + cmd
-        if kind[0] == 'f':
-            cmd = 'IN=' + quote(inf) + '; ' + cmd
-        if kind[0] == '-' and inf:
-            cmd = cmd + ' <' + quote(inf)
-        if kind[1] == '-' and outf:
-            cmd = cmd + ' >' + quote(outf)
-        item[1] = cmd
-    #
-    cmdlist = list[0][1]
-    for item in list[1:]:
-        [cmd, kind] = item[1:3]
-        if item[0] == '':
-            if 'f' in kind:
-                cmd = '{ ' + cmd + '; }'
-            cmdlist = cmdlist + ' |\n' + cmd
-        else:
-            cmdlist = cmdlist + '\n' + cmd
-    #
-    if garbage:
-        rmcmd = 'rm -f'
-        for file in garbage:
-            rmcmd = rmcmd + ' ' + quote(file)
-        trapcmd = 'trap ' + quote(rmcmd + '; exit') + ' 1 2 3 13 14 15'
-        cmdlist = trapcmd + '\n' + cmdlist + '\n' + rmcmd
-    #
-    return cmdlist