Mercurial Repositories > eric / file comparison
comparison: DebugClients/Python/coverage/fullcoverage/encodings.py
DebugClients/Python/coverage/fullcoverage/encodings.py
- changeset 3497
- 7f51ab29a1a2
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| 3493:71f15675e89f | 3497:7f51ab29a1a2 |
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| 1 """Imposter encodings module that installs a coverage-style tracer. | |
| 2 | |
| 3 This is NOT the encodings module; it is an imposter that sets up tracing | |
| 4 instrumentation and then replaces itself with the real encodings module. | |
| 5 | |
| 6 If the directory that holds this file is placed first in the PYTHONPATH when | |
| 7 using "coverage" to run Python's tests, then this file will become the very | |
| 8 first module imported by the internals of Python 3. It installs a | |
| 9 coverage-compatible trace function that can watch Standard Library modules | |
| 10 execute from the very earliest stages of Python's own boot process. This fixes | |
| 11 a problem with coverage - that it starts too late to trace the coverage of many | |
| 12 of the most fundamental modules in the Standard Library. | |
| 13 | |
| 14 """ | |
| 15 | |
| 16 import sys | |
| 17 | |
| 18 class FullCoverageTracer(object): | |
| 19 def __init__(self): | |
| 20 # `traces` is a list of trace events. Frames are tricky: the same | |
| 21 # frame object is used for a whole scope, with new line numbers | |
| 22 # written into it. So in one scope, all the frame objects are the | |
| 23 # same object, and will eventually all will point to the last line | |
| 24 # executed. So we keep the line numbers alongside the frames. | |
| 25 # The list looks like: | |
| 26 # | |
| 27 # traces = [ | |
| 28 # ((frame, event, arg), lineno), ... | |
| 29 # ] | |
| 30 # | |
| 31 self.traces = [] | |
| 32 | |
| 33 def fullcoverage_trace(self, *args): | |
| 34 frame, event, arg = args | |
| 35 self.traces.append((args, frame.f_lineno)) | |
| 36 return self.fullcoverage_trace | |
| 37 | |
| 38 sys.settrace(FullCoverageTracer().fullcoverage_trace) | |
| 39 | |
| 40 # In coverage/files.py is actual_filename(), which uses glob.glob. I don't | |
| 41 # understand why, but that use of glob borks everything if fullcoverage is in | |
| 42 # effect. So here we make an ugly hail-mary pass to switch off glob.glob over | |
| 43 # there. This means when using fullcoverage, Windows path names will not be | |
| 44 # their actual case. | |
| 45 | |
| 46 #sys.fullcoverage = True | |
| 47 | |
| 48 # Finally, remove our own directory from sys.path; remove ourselves from | |
| 49 # sys.modules; and re-import "encodings", which will be the real package | |
| 50 # this time. Note that the delete from sys.modules dictionary has to | |
| 51 # happen last, since all of the symbols in this module will become None | |
| 52 # at that exact moment, including "sys". | |
| 53 | |
| 54 parentdir = max(filter(__file__.startswith, sys.path), key=len) | |
| 55 sys.path.remove(parentdir) | |
| 56 del sys.modules['encodings'] | |
| 57 import encodings |
