Source

SCons / src / test_interrupts.py

Steven Knight be3f92d 





























































Steven Knight 6ee165c 








Steven Knight 16adeda 




Greg Noel 450d604 

Steven Knight be3f92d 




Steven Knight 6fe28e0 
Steven Knight be3f92d 





Greg Noel 2395d93 
Steven Knight be3f92d 








Greg Noel 450d604 
Steven Knight be3f92d 

Steven Knight 6ee165c 
Steven Knight be3f92d 






Greg Noel 450d604 
Steven Knight be3f92d 
Steven Knight 6ee165c 
Steven Knight be3f92d 



Greg Noel 2ad4940 
Steven Knight be3f92d 

Greg Noel 2ad4940 
Steven Knight be3f92d 




Steven Knight 6ee165c 






Steven Knight be3f92d 



Steven Knight 9aa3f9a 




#!/usr/bin/env python
#
# __COPYRIGHT__
#
# 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.

__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"

"""
Verify that the SCons source code contains only correct handling of
keyboard interrupts (e.g. Ctrl-C).
"""

import os
import os.path
import re
import time

import TestSCons

test = TestSCons.TestSCons()

# We do not want statements of the form:
# try:
#   # do something, e.g.
#   return a['x']
# except:
#   # do the exception handling
#   a['x'] = getx()
#   return a['x']
#
# The code above may catch a KeyboardInterrupt exception, which was not
# intended by the programmer. We check for these situations in all python
# source files.

try:
    cwd = os.environ['SCONS_CWD']
except KeyError:
    scons_lib_dir = os.environ['SCONS_LIB_DIR']
    MANIFEST = os.path.join(scons_lib_dir, 'MANIFEST.in')
else:
    #cwd = os.getcwd()
    scons_lib_dir = os.path.join(cwd, 'build', 'scons')
    MANIFEST = os.path.join(scons_lib_dir, 'MANIFEST')

# We expect precisely this many uncaught KeyboardInterrupt exceptions
# from the files in the following dictionary.

expected_uncaught = {
    'engine/SCons/Job.py' :             5,
    'engine/SCons/Script/Main.py' :     1,
    'engine/SCons/Taskmaster.py' :      3,
}

try:
    fp = open(MANIFEST)
except IOError:
    test.skip_test('%s does not exist; skipping test.\n' % MANIFEST)
else:
    files = fp.read().split()
    files = [f for f in files if f[-3:] == '.py']

# some regexps to parse the python files
tryexc_pat = re.compile(
r'^(?P<try_or_except>(?P<indent> *)(try|except)( [^\n]*)?:.*)',re.MULTILINE)
keyboardint_pat = re.compile(r' *except +([^,],)*KeyboardInterrupt([ ,][^\n]*)?:[^\n]*')
exceptall_pat   = re.compile(r' *except(?: *| +Exception *, *[^: ]+):[^\n]*')

uncaughtKeyboardInterrupt = 0
for f in files:
    contents = open(os.path.join(scons_lib_dir, f)).read()
    try_except_lines = {}
    lastend = 0
    while True:
        match = tryexc_pat.search( contents, lastend )
        if match is None:
            break
        #print match.groups()
        lastend = match.end()
        try:
            indent_list = try_except_lines[match.group('indent')]
        except:
            indent_list = []
        line_num = 1 + contents[:match.start()].count('\n')
        indent_list.append( (line_num, match.group('try_or_except') ) )
        try_except_lines[match.group('indent')] = indent_list
    uncaught_this_file = []
    for indent in try_except_lines.keys():
        exc_keyboardint_seen = 0
        exc_all_seen = 0
        for (l,statement) in try_except_lines[indent] + [(-1,indent + 'try')]:
            #print "%4d %s" % (l,statement),
            m1 = keyboardint_pat.match(statement)
            m2 = exceptall_pat.match(statement)
            if statement.find(indent + 'try') == 0:
                if exc_all_seen and not exc_keyboardint_seen:
                    uncaught_this_file.append(line)
                exc_keyboardint_seen = 0
                exc_all_seen = 0
                line = l
                #print " -> reset"
            elif m1 is not None:
                exc_keyboardint_seen = 1
                #print " -> keyboard -> ", m1.groups()
            elif m2 is not None:
                exc_all_seen = 1
                #print " -> all -> ", m2.groups()
            else:
                pass
                #print "Warning: unknown statement %s" % statement
    expected_num = expected_uncaught.get(f, 0)
    if expected_num != len(uncaught_this_file):
        uncaughtKeyboardInterrupt = 1
        msg = "%s:  expected %d uncaught interrupts, got %d:"
        print msg % (f, expected_num, len(uncaught_this_file))
        for line in uncaught_this_file:
            print "  File %s:%d: Uncaught KeyboardInterrupt!" % (f,line)

test.fail_test(uncaughtKeyboardInterrupt)

test.pass_test()

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