context: change workingctx str() from . to <node>+
#!/usr/bin/python
#
# Perforce Defect Tracking Integration Project
# <http://www.ravenbrook.com/project/p4dti/>
#
# COVERAGE.PY -- COVERAGE TESTING
#
# Gareth Rees, Ravenbrook Limited, 2001-12-04
# Ned Batchelder, 2004-12-12
# http://nedbatchelder.com/code/modules/coverage.html
#
#
# 1. INTRODUCTION
#
# This module provides coverage testing for Python code.
#
# The intended readership is all Python developers.
#
# This document is not confidential.
#
# See [GDR 2001-12-04a] for the command-line interface, programmatic
# interface and limitations. See [GDR 2001-12-04b] for requirements and
# design.
"""Usage:
coverage.py -x MODULE.py [ARG1 ARG2 ...]
Execute module, passing the given command-line arguments, collecting
coverage data.
coverage.py -e
Erase collected coverage data.
coverage.py -r [-m] [-o dir1,dir2,...] FILE1 FILE2 ...
Report on the statement coverage for the given files. With the -m
option, show line numbers of the statements that weren't executed.
coverage.py -a [-d dir] [-o dir1,dir2,...] FILE1 FILE2 ...
Make annotated copies of the given files, marking statements that
are executed with > and statements that are missed with !. With
the -d option, make the copies in that directory. Without the -d
option, make each copy in the same directory as the original.
-o dir,dir2,...
Omit reporting or annotating files when their filename path starts with
a directory listed in the omit list.
e.g. python coverage.py -i -r -o c:\python23,lib\enthought\traits
Coverage data is saved in the file .coverage by default. Set the
COVERAGE_FILE environment variable to save it somewhere else."""
__version__ = "2.5.20051204" # see detailed history at the end of this file.
import compiler
import compiler.visitor
import os
import re
import string
import sys
import threading
import types
# 2. IMPLEMENTATION
#
# This uses the "singleton" pattern.
#
# The word "morf" means a module object (from which the source file can
# be deduced by suitable manipulation of the __file__ attribute) or a
# filename.
#
# When we generate a coverage report we have to canonicalize every
# filename in the coverage dictionary just in case it refers to the
# module we are reporting on. It seems a shame to throw away this
# information so the data in the coverage dictionary is transferred to
# the 'cexecuted' dictionary under the canonical filenames.
#
# The coverage dictionary is called "c" and the trace function "t". The
# reason for these short names is that Python looks up variables by name
# at runtime and so execution time depends on the length of variables!
# In the bottleneck of this application it's appropriate to abbreviate
# names to increase speed.
class StatementFindingAstVisitor(compiler.visitor.ASTVisitor):
def __init__(self, statements, excluded, suite_spots):
compiler.visitor.ASTVisitor.__init__(self)
self.statements = statements
self.excluded = excluded
self.suite_spots = suite_spots
self.excluding_suite = 0
def doRecursive(self, node):
self.recordNodeLine(node)
for n in node.getChildNodes():
self.dispatch(n)
visitStmt = visitModule = doRecursive
def doCode(self, node):
if hasattr(node, 'decorators') and node.decorators:
self.dispatch(node.decorators)
self.doSuite(node, node.code)
visitFunction = visitClass = doCode
def getFirstLine(self, node):
# Find the first line in the tree node.
lineno = node.lineno
for n in node.getChildNodes():
f = self.getFirstLine(n)
if lineno and f:
lineno = min(lineno, f)
else:
lineno = lineno or f
return lineno
def getLastLine(self, node):
# Find the first line in the tree node.
lineno = node.lineno
for n in node.getChildNodes():
lineno = max(lineno, self.getLastLine(n))
return lineno
def doStatement(self, node):
self.recordLine(self.getFirstLine(node))
visitAssert = visitAssign = visitAssTuple = visitDiscard = visitPrint = \
visitPrintnl = visitRaise = visitSubscript = visitDecorators = \
doStatement
def recordNodeLine(self, node):
return self.recordLine(node.lineno)
def recordLine(self, lineno):
# Returns a bool, whether the line is included or excluded.
if lineno:
# Multi-line tests introducing suites have to get charged to their
# keyword.
if lineno in self.suite_spots:
lineno = self.suite_spots[lineno][0]
# If we're inside an exluded suite, record that this line was
# excluded.
if self.excluding_suite:
self.excluded[lineno] = 1
return 0
# If this line is excluded, or suite_spots maps this line to
# another line that is exlcuded, then we're excluded.
elif self.excluded.has_key(lineno) or \
self.suite_spots.has_key(lineno) and \
self.excluded.has_key(self.suite_spots[lineno][1]):
return 0
# Otherwise, this is an executable line.
else:
self.statements[lineno] = 1
return 1
return 0
default = recordNodeLine
def recordAndDispatch(self, node):
self.recordNodeLine(node)
self.dispatch(node)
def doSuite(self, intro, body, exclude=0):
exsuite = self.excluding_suite
if exclude or (intro and not self.recordNodeLine(intro)):
self.excluding_suite = 1
self.recordAndDispatch(body)
self.excluding_suite = exsuite
def doPlainWordSuite(self, prevsuite, suite):
# Finding the exclude lines for else's is tricky, because they aren't
# present in the compiler parse tree. Look at the previous suite,
# and find its last line. If any line between there and the else's
# first line are excluded, then we exclude the else.
lastprev = self.getLastLine(prevsuite)
firstelse = self.getFirstLine(suite)
for l in range(lastprev+1, firstelse):
if self.suite_spots.has_key(l):
self.doSuite(None, suite, exclude=self.excluded.has_key(l))
break
else:
self.doSuite(None, suite)
def doElse(self, prevsuite, node):
if node.else_:
self.doPlainWordSuite(prevsuite, node.else_)
def visitFor(self, node):
self.doSuite(node, node.body)
self.doElse(node.body, node)
def visitIf(self, node):
# The first test has to be handled separately from the rest.
# The first test is credited to the line with the "if", but the others
# are credited to the line with the test for the elif.
self.doSuite(node, node.tests[0][1])
for t, n in node.tests[1:]:
self.doSuite(t, n)
self.doElse(node.tests[-1][1], node)
def visitWhile(self, node):
self.doSuite(node, node.body)
self.doElse(node.body, node)
def visitTryExcept(self, node):
self.doSuite(node, node.body)
for i in range(len(node.handlers)):
a, b, h = node.handlers[i]
if not a:
# It's a plain "except:". Find the previous suite.
if i > 0:
prev = node.handlers[i-1][2]
else:
prev = node.body
self.doPlainWordSuite(prev, h)
else:
self.doSuite(a, h)
self.doElse(node.handlers[-1][2], node)
def visitTryFinally(self, node):
self.doSuite(node, node.body)
self.doPlainWordSuite(node.body, node.final)
def visitGlobal(self, node):
# "global" statements don't execute like others (they don't call the
# trace function), so don't record their line numbers.
pass
the_coverage = None
class coverage:
error = "coverage error"
# Name of the cache file (unless environment variable is set).
cache_default = ".coverage"
# Environment variable naming the cache file.
cache_env = "COVERAGE_FILE"
# A dictionary with an entry for (Python source file name, line number
# in that file) if that line has been executed.
c = {}
# A map from canonical Python source file name to a dictionary in
# which there's an entry for each line number that has been
# executed.
cexecuted = {}
# Cache of results of calling the analysis2() method, so that you can
# specify both -r and -a without doing double work.
analysis_cache = {}
# Cache of results of calling the canonical_filename() method, to
# avoid duplicating work.
canonical_filename_cache = {}
def __init__(self):
global the_coverage
if the_coverage:
raise self.error, "Only one coverage object allowed."
self.usecache = 1
self.cache = None
self.exclude_re = ''
self.nesting = 0
self.cstack = []
self.xstack = []
self.relative_dir = os.path.normcase(os.path.abspath(os.curdir)+os.path.sep)
# t(f, x, y). This method is passed to sys.settrace as a trace function.
# See [van Rossum 2001-07-20b, 9.2] for an explanation of sys.settrace and
# the arguments and return value of the trace function.
# See [van Rossum 2001-07-20a, 3.2] for a description of frame and code
# objects.
def t(self, f, w, a): #pragma: no cover
#print w, f.f_code.co_filename, f.f_lineno
if w == 'line':
self.c[(f.f_code.co_filename, f.f_lineno)] = 1
for c in self.cstack:
c[(f.f_code.co_filename, f.f_lineno)] = 1
return self.t
def help(self, error=None):
if error:
print error
print
print __doc__
sys.exit(1)
def command_line(self):
import getopt
settings = {}
optmap = {
'-a': 'annotate',
'-d:': 'directory=',
'-e': 'erase',
'-h': 'help',
'-i': 'ignore-errors',
'-m': 'show-missing',
'-r': 'report',
'-x': 'execute',
'-o': 'omit=',
}
short_opts = string.join(map(lambda o: o[1:], optmap.keys()), '')
long_opts = optmap.values()
options, args = getopt.getopt(sys.argv[1:], short_opts, long_opts)
for o, a in options:
if optmap.has_key(o):
settings[optmap[o]] = 1
elif optmap.has_key(o + ':'):
settings[optmap[o + ':']] = a
elif o[2:] in long_opts:
settings[o[2:]] = 1
elif o[2:] + '=' in long_opts:
settings[o[2:]] = a
else:
self.help("Unknown option: '%s'." % o)
if settings.get('help'):
self.help()
for i in ['erase', 'execute']:
for j in ['annotate', 'report']:
if settings.get(i) and settings.get(j):
self.help("You can't specify the '%s' and '%s' "
"options at the same time." % (i, j))
args_needed = (settings.get('execute')
or settings.get('annotate')
or settings.get('report'))
action = settings.get('erase') or args_needed
if not action:
self.help("You must specify at least one of -e, -x, -r, or -a.")
if not args_needed and args:
self.help("Unexpected arguments %s." % args)
self.get_ready()
self.exclude('#pragma[: ]+[nN][oO] [cC][oO][vV][eE][rR]')
if settings.get('erase'):
self.erase()
if settings.get('execute'):
if not args:
self.help("Nothing to do.")
sys.argv = args
self.start()
import __main__
sys.path[0] = os.path.dirname(sys.argv[0])
execfile(sys.argv[0], __main__.__dict__)
if not args:
args = self.cexecuted.keys()
ignore_errors = settings.get('ignore-errors')
show_missing = settings.get('show-missing')
directory = settings.get('directory')
omit = filter(None, settings.get('omit', '').split(','))
omit += ['/<'] # Always skip /<string> etc.
if settings.get('report'):
self.report(args, show_missing, ignore_errors, omit_prefixes=omit)
if settings.get('annotate'):
self.annotate(args, directory, ignore_errors, omit_prefixes=omit)
def use_cache(self, usecache):
self.usecache = usecache
def get_ready(self):
if self.usecache and not self.cache:
self.cache = os.path.abspath(os.environ.get(self.cache_env,
self.cache_default))
self.restore()
self.analysis_cache = {}
def start(self):
self.get_ready()
if self.nesting == 0: #pragma: no cover
sys.settrace(self.t)
if hasattr(threading, 'settrace'):
threading.settrace(self.t)
self.nesting += 1
def stop(self):
self.nesting -= 1
if self.nesting == 0: #pragma: no cover
sys.settrace(None)
if hasattr(threading, 'settrace'):
threading.settrace(None)
def erase(self):
self.c = {}
self.analysis_cache = {}
self.cexecuted = {}
if self.cache and os.path.exists(self.cache):
os.remove(self.cache)
self.exclude_re = ""
def exclude(self, re):
if self.exclude_re:
self.exclude_re += "|"
self.exclude_re += "(" + re + ")"
def begin_recursive(self):
self.cstack.append(self.c)
self.xstack.append(self.exclude_re)
def end_recursive(self):
self.c = self.cstack.pop()
self.exclude_re = self.xstack.pop()
# save(). Save coverage data to the coverage cache.
def save(self):
# move to directory that must exist.
os.chdir(os.sep)
if self.usecache and self.cache:
self.canonicalize_filenames()
cache = open(self.cache, 'wb')
import marshal
marshal.dump(self.cexecuted, cache)
cache.close()
# restore(). Restore coverage data from the coverage cache (if it exists).
def restore(self):
self.c = {}
self.cexecuted = {}
assert self.usecache
if not os.path.exists(self.cache):
return
try:
cache = open(self.cache, 'rb')
import marshal
cexecuted = marshal.load(cache)
cache.close()
if isinstance(cexecuted, types.DictType):
self.cexecuted = cexecuted
except:
pass
# canonical_filename(filename). Return a canonical filename for the
# file (that is, an absolute path with no redundant components and
# normalized case). See [GDR 2001-12-04b, 3.3].
def canonical_filename(self, filename):
if not self.canonical_filename_cache.has_key(filename):
f = filename
if os.path.isabs(f) and not os.path.exists(f):
f = os.path.basename(f)
if not os.path.isabs(f):
for path in [os.curdir] + sys.path:
g = os.path.join(path, f)
if os.path.exists(g):
f = g
break
cf = os.path.normcase(os.path.abspath(f))
self.canonical_filename_cache[filename] = cf
return self.canonical_filename_cache[filename]
# canonicalize_filenames(). Copy results from "c" to "cexecuted",
# canonicalizing filenames on the way. Clear the "c" map.
def canonicalize_filenames(self):
for filename, lineno in self.c.keys():
f = self.canonical_filename(filename)
if not self.cexecuted.has_key(f):
self.cexecuted[f] = {}
self.cexecuted[f][lineno] = 1
self.c = {}
# morf_filename(morf). Return the filename for a module or file.
def morf_filename(self, morf):
if isinstance(morf, types.ModuleType):
if not hasattr(morf, '__file__'):
raise self.error, "Module has no __file__ attribute."
file = morf.__file__
else:
file = morf
return self.canonical_filename(file)
# analyze_morf(morf). Analyze the module or filename passed as
# the argument. If the source code can't be found, raise an error.
# Otherwise, return a tuple of (1) the canonical filename of the
# source code for the module, (2) a list of lines of statements
# in the source code, and (3) a list of lines of excluded statements.
def analyze_morf(self, morf):
if self.analysis_cache.has_key(morf):
return self.analysis_cache[morf]
filename = self.morf_filename(morf)
ext = os.path.splitext(filename)[1]
if ext == '.pyc':
if not os.path.exists(filename[0:-1]):
raise self.error, ("No source for compiled code '%s'."
% filename)
filename = filename[0:-1]
elif ext != '.py':
raise self.error, "File '%s' not Python source." % filename
source = open(filename, 'r')
lines, excluded_lines = self.find_executable_statements(
source.read(), exclude=self.exclude_re
)
source.close()
result = filename, lines, excluded_lines
self.analysis_cache[morf] = result
return result
def get_suite_spots(self, tree, spots):
import symbol, token
for i in range(1, len(tree)):
if type(tree[i]) == type(()):
if tree[i][0] == symbol.suite:
# Found a suite, look back for the colon and keyword.
lineno_colon = lineno_word = None
for j in range(i-1, 0, -1):
if tree[j][0] == token.COLON:
lineno_colon = tree[j][2]
elif tree[j][0] == token.NAME:
if tree[j][1] == 'elif':
# Find the line number of the first non-terminal
# after the keyword.
t = tree[j+1]
while t and token.ISNONTERMINAL(t[0]):
t = t[1]
if t:
lineno_word = t[2]
else:
lineno_word = tree[j][2]
break
elif tree[j][0] == symbol.except_clause:
# "except" clauses look like:
# ('except_clause', ('NAME', 'except', lineno), ...)
if tree[j][1][0] == token.NAME:
lineno_word = tree[j][1][2]
break
if lineno_colon and lineno_word:
# Found colon and keyword, mark all the lines
# between the two with the two line numbers.
for l in range(lineno_word, lineno_colon+1):
spots[l] = (lineno_word, lineno_colon)
self.get_suite_spots(tree[i], spots)
def find_executable_statements(self, text, exclude=None):
# Find lines which match an exclusion pattern.
excluded = {}
suite_spots = {}
if exclude:
reExclude = re.compile(exclude)
lines = text.split('\n')
for i in range(len(lines)):
if reExclude.search(lines[i]):
excluded[i+1] = 1
import parser
tree = parser.suite(text+'\n\n').totuple(1)
self.get_suite_spots(tree, suite_spots)
# Use the compiler module to parse the text and find the executable
# statements. We add newlines to be impervious to final partial lines.
statements = {}
ast = compiler.parse(text+'\n\n')
visitor = StatementFindingAstVisitor(statements, excluded, suite_spots)
compiler.walk(ast, visitor, walker=visitor)
lines = statements.keys()
lines.sort()
excluded_lines = excluded.keys()
excluded_lines.sort()
return lines, excluded_lines
# format_lines(statements, lines). Format a list of line numbers
# for printing by coalescing groups of lines as long as the lines
# represent consecutive statements. This will coalesce even if
# there are gaps between statements, so if statements =
# [1,2,3,4,5,10,11,12,13,14] and lines = [1,2,5,10,11,13,14] then
# format_lines will return "1-2, 5-11, 13-14".
def format_lines(self, statements, lines):
pairs = []
i = 0
j = 0
start = None
pairs = []
while i < len(statements) and j < len(lines):
if statements[i] == lines[j]:
if start == None:
start = lines[j]
end = lines[j]
j = j + 1
elif start:
pairs.append((start, end))
start = None
i = i + 1
if start:
pairs.append((start, end))
def stringify(pair):
start, end = pair
if start == end:
return "%d" % start
else:
return "%d-%d" % (start, end)
return string.join(map(stringify, pairs), ", ")
# Backward compatibility with version 1.
def analysis(self, morf):
f, s, _, m, mf = self.analysis2(morf)
return f, s, m, mf
def analysis2(self, morf):
filename, statements, excluded = self.analyze_morf(morf)
self.canonicalize_filenames()
if not self.cexecuted.has_key(filename):
self.cexecuted[filename] = {}
missing = []
for line in statements:
if not self.cexecuted[filename].has_key(line):
missing.append(line)
return (filename, statements, excluded, missing,
self.format_lines(statements, missing))
def relative_filename(self, filename):
""" Convert filename to relative filename from self.relative_dir.
"""
return filename.replace(self.relative_dir, "")
def morf_name(self, morf):
""" Return the name of morf as used in report.
"""
if isinstance(morf, types.ModuleType):
return morf.__name__
else:
return self.relative_filename(os.path.splitext(morf)[0])
def filter_by_prefix(self, morfs, omit_prefixes):
""" Return list of morfs where the morf name does not begin
with any one of the omit_prefixes.
"""
filtered_morfs = []
for morf in morfs:
for prefix in omit_prefixes:
if self.morf_name(morf).startswith(prefix):
break
else:
filtered_morfs.append(morf)
return filtered_morfs
def morf_name_compare(self, x, y):
return cmp(self.morf_name(x), self.morf_name(y))
def report(self, morfs, show_missing=1, ignore_errors=0, file=None, omit_prefixes=[]):
if not isinstance(morfs, types.ListType):
morfs = [morfs]
morfs = self.filter_by_prefix(morfs, omit_prefixes)
morfs.sort(self.morf_name_compare)
max_name = max([5,] + map(len, map(self.morf_name, morfs)))
fmt_name = "%%- %ds " % max_name
fmt_err = fmt_name + "%s: %s"
header = fmt_name % "Name" + " Stmts Exec Cover"
fmt_coverage = fmt_name + "% 6d % 6d % 5d%%"
if show_missing:
header = header + " Missing"
fmt_coverage = fmt_coverage + " %s"
if not file:
file = sys.stdout
print >>file, header
print >>file, "-" * len(header)
total_statements = 0
total_executed = 0
for morf in morfs:
name = self.morf_name(morf)
try:
_, statements, _, missing, readable = self.analysis2(morf)
n = len(statements)
m = n - len(missing)
if n > 0:
pc = 100.0 * m / n
else:
pc = 100.0
args = (name, n, m, pc)
if show_missing:
args = args + (readable,)
print >>file, fmt_coverage % args
total_statements = total_statements + n
total_executed = total_executed + m
except KeyboardInterrupt: #pragma: no cover
raise
except:
if not ignore_errors:
type, msg = sys.exc_info()[0:2]
print >>file, fmt_err % (name, type, msg)
if len(morfs) > 1:
print >>file, "-" * len(header)
if total_statements > 0:
pc = 100.0 * total_executed / total_statements
else:
pc = 100.0
args = ("TOTAL", total_statements, total_executed, pc)
if show_missing:
args = args + ("",)
print >>file, fmt_coverage % args
# annotate(morfs, ignore_errors).
blank_re = re.compile(r"\s*(#|$)")
else_re = re.compile(r"\s*else\s*:\s*(#|$)")
def annotate(self, morfs, directory=None, ignore_errors=0, omit_prefixes=[]):
morfs = self.filter_by_prefix(morfs, omit_prefixes)
for morf in morfs:
try:
filename, statements, excluded, missing, _ = self.analysis2(morf)
self.annotate_file(filename, statements, excluded, missing, directory)
except KeyboardInterrupt:
raise
except:
if not ignore_errors:
raise
def annotate_file(self, filename, statements, excluded, missing, directory=None):
source = open(filename, 'r')
if directory:
dest_file = os.path.join(directory,
os.path.basename(filename)
+ ',cover')
else:
dest_file = filename + ',cover'
dest = open(dest_file, 'w')
lineno = 0
i = 0
j = 0
covered = 1
while 1:
line = source.readline()
if line == '':
break
lineno = lineno + 1
while i < len(statements) and statements[i] < lineno:
i = i + 1
while j < len(missing) and missing[j] < lineno:
j = j + 1
if i < len(statements) and statements[i] == lineno:
covered = j >= len(missing) or missing[j] > lineno
if self.blank_re.match(line):
dest.write(' ')
elif self.else_re.match(line):
# Special logic for lines containing only 'else:'.
# See [GDR 2001-12-04b, 3.2].
if i >= len(statements) and j >= len(missing):
dest.write('! ')
elif i >= len(statements) or j >= len(missing):
dest.write('> ')
elif statements[i] == missing[j]:
dest.write('! ')
else:
dest.write('> ')
elif lineno in excluded:
dest.write('- ')
elif covered:
dest.write('> ')
else:
dest.write('! ')
dest.write(line)
source.close()
dest.close()
# Singleton object.
the_coverage = coverage()
# Module functions call methods in the singleton object.
def use_cache(*args, **kw): return the_coverage.use_cache(*args, **kw)
def start(*args, **kw): return the_coverage.start(*args, **kw)
def stop(*args, **kw): return the_coverage.stop(*args, **kw)
def erase(*args, **kw): return the_coverage.erase(*args, **kw)
def begin_recursive(*args, **kw): return the_coverage.begin_recursive(*args, **kw)
def end_recursive(*args, **kw): return the_coverage.end_recursive(*args, **kw)
def exclude(*args, **kw): return the_coverage.exclude(*args, **kw)
def analysis(*args, **kw): return the_coverage.analysis(*args, **kw)
def analysis2(*args, **kw): return the_coverage.analysis2(*args, **kw)
def report(*args, **kw): return the_coverage.report(*args, **kw)
def annotate(*args, **kw): return the_coverage.annotate(*args, **kw)
def annotate_file(*args, **kw): return the_coverage.annotate_file(*args, **kw)
# Save coverage data when Python exits. (The atexit module wasn't
# introduced until Python 2.0, so use sys.exitfunc when it's not
# available.)
try:
import atexit
atexit.register(the_coverage.save)
except ImportError:
sys.exitfunc = the_coverage.save
# Command-line interface.
if __name__ == '__main__':
the_coverage.command_line()
# A. REFERENCES
#
# [GDR 2001-12-04a] "Statement coverage for Python"; Gareth Rees;
# Ravenbrook Limited; 2001-12-04;
# <http://www.nedbatchelder.com/code/modules/rees-coverage.html>.
#
# [GDR 2001-12-04b] "Statement coverage for Python: design and
# analysis"; Gareth Rees; Ravenbrook Limited; 2001-12-04;
# <http://www.nedbatchelder.com/code/modules/rees-design.html>.
#
# [van Rossum 2001-07-20a] "Python Reference Manual (releae 2.1.1)";
# Guide van Rossum; 2001-07-20;
# <http://www.python.org/doc/2.1.1/ref/ref.html>.
#
# [van Rossum 2001-07-20b] "Python Library Reference"; Guido van Rossum;
# 2001-07-20; <http://www.python.org/doc/2.1.1/lib/lib.html>.
#
#
# B. DOCUMENT HISTORY
#
# 2001-12-04 GDR Created.
#
# 2001-12-06 GDR Added command-line interface and source code
# annotation.
#
# 2001-12-09 GDR Moved design and interface to separate documents.
#
# 2001-12-10 GDR Open cache file as binary on Windows. Allow
# simultaneous -e and -x, or -a and -r.
#
# 2001-12-12 GDR Added command-line help. Cache analysis so that it
# only needs to be done once when you specify -a and -r.
#
# 2001-12-13 GDR Improved speed while recording. Portable between
# Python 1.5.2 and 2.1.1.
#
# 2002-01-03 GDR Module-level functions work correctly.
#
# 2002-01-07 GDR Update sys.path when running a file with the -x option,
# so that it matches the value the program would get if it were run on
# its own.
#
# 2004-12-12 NMB Significant code changes.
# - Finding executable statements has been rewritten so that docstrings and
# other quirks of Python execution aren't mistakenly identified as missing
# lines.
# - Lines can be excluded from consideration, even entire suites of lines.
# - The filesystem cache of covered lines can be disabled programmatically.
# - Modernized the code.
#
# 2004-12-14 NMB Minor tweaks. Return 'analysis' to its original behavior
# and add 'analysis2'. Add a global for 'annotate', and factor it, adding
# 'annotate_file'.
#
# 2004-12-31 NMB Allow for keyword arguments in the module global functions.
# Thanks, Allen.
#
# 2005-12-02 NMB Call threading.settrace so that all threads are measured.
# Thanks Martin Fuzzey. Add a file argument to report so that reports can be
# captured to a different destination.
#
# 2005-12-03 NMB coverage.py can now measure itself.
#
# 2005-12-04 NMB Adapted Greg Rogers' patch for using relative filenames,
# and sorting and omitting files to report on.
#
# C. COPYRIGHT AND LICENCE
#
# Copyright 2001 Gareth Rees. All rights reserved.
# Copyright 2004-2005 Ned Batchelder. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the
# distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
# TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
# USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
# DAMAGE.
#
# $Id: coverage.py 26 2005-12-04 18:42:44Z ned $