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#!/usr/bin/env python
#
# Copyright 2016 WebAssembly Community Group participants
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import contextlib
import os
import shutil
import signal
import subprocess
import sys
import tempfile
# Get signal names from numbers in Python
# http://stackoverflow.com/a/2549950
SIGNAMES = dict((k, v) for v, k in reversed(sorted(signal.__dict__.items()))
if v.startswith('SIG') and not v.startswith('SIG_'))
class Error(Exception):
pass
class Executable(object):
def __init__(self, exe, error_cmdline=True, clean_stdout=None,
clean_stderr=None):
self.exe = exe
self.extra_args = []
self.error_cmdline = error_cmdline
self.clean_stdout = clean_stdout
self.clean_stderr = clean_stderr
def RunWithArgs(self, *args):
cmd = [self.exe] + list(args) + self.extra_args
cmd_str = ' '.join(cmd)
err_cmd_str = cmd_str
if not self.error_cmdline:
err_cmd_str = os.path.basename(self.exe)
try:
process = subprocess.Popen(cmd, stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
stdout, stderr = process.communicate()
if self.clean_stdout:
stdout = self.clean_stdout(stdout)
if self.clean_stderr:
stderr = self.clean_stderr(stderr)
sys.stdout.write(stdout)
if process.returncode < 0:
# Terminated by signal
signame = SIGNAMES.get(-process.returncode, '<unknown>')
raise Error('Signal raised running "%s": %s\n%s' % (
err_cmd_str, signame, stderr))
elif process.returncode > 0:
raise Error('Error running "%s":\n%s' % (err_cmd_str, stderr))
except OSError as e:
raise Error('Error running "%s": %s' % (err_cmd_str, str(e)))
def AppendArg(self, arg):
self.extra_args.append(arg)
def AppendOptionalArgs(self, option_dict):
for option, value in option_dict.iteritems():
if value:
self.AppendArg(option)
@contextlib.contextmanager
def TempDirectory(out_dir, prefix=None):
if out_dir:
out_dir_is_temp = False
if not os.path.exists(out_dir):
os.makedirs(out_dir)
else:
out_dir = tempfile.mkdtemp(prefix=prefix)
out_dir_is_temp = True
try:
yield out_dir
finally:
if out_dir_is_temp:
shutil.rmtree(out_dir)
def ChangeExt(path, new_ext):
return os.path.splitext(path)[0] + new_ext
def ChangeDir(path, new_dir):
return os.path.join(new_dir, os.path.basename(path))
def Hexdump(data):
DUMP_OCTETS_PER_LINE = 16
DUMP_OCTETS_PER_GROUP = 2
p = 0
end = len(data)
lines = []
while p < end:
line_start = p
line_end = p + DUMP_OCTETS_PER_LINE
line = '%07x: ' % p
while p < line_end:
for i in xrange(DUMP_OCTETS_PER_GROUP):
if p < end:
line += '%02x' % ord(data[p])
else:
line += ' '
p += 1
line += ' '
line += ' '
p = line_start
for i in xrange(DUMP_OCTETS_PER_LINE):
if p >= end:
break
x = data[p]
o = ord(x)
if o >= 32 and o < 0x7f:
line += '%c' % x
else:
line += '.'
p += 1
line += '\n'
lines.append(line)
return lines
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