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"""
API for the command-line I{pyflakes} tool.
"""
from __future__ import with_statement
import sys
import os
import _ast
from pyflakes import checker, __version__
from pyflakes import reporter as modReporter
__all__ = ['check', 'checkPath', 'checkRecursive', 'iterSourceCode', 'main']
def check(codeString, filename, reporter=None):
"""
Check the Python source given by C{codeString} for flakes.
@param codeString: The Python source to check.
@type codeString: C{str}
@param filename: The name of the file the source came from, used to report
errors.
@type filename: C{str}
@param reporter: A L{Reporter} instance, where errors and warnings will be
reported.
@return: The number of warnings emitted.
@rtype: C{int}
"""
if reporter is None:
reporter = modReporter._makeDefaultReporter()
# First, compile into an AST and handle syntax errors.
try:
tree = compile(codeString, filename, "exec", _ast.PyCF_ONLY_AST)
except SyntaxError:
value = sys.exc_info()[1]
msg = value.args[0]
(lineno, offset, text) = value.lineno, value.offset, value.text
# If there's an encoding problem with the file, the text is None.
if text is None:
# Avoid using msg, since for the only known case, it contains a
# bogus message that claims the encoding the file declared was
# unknown.
reporter.unexpectedError(filename, 'problem decoding source')
else:
reporter.syntaxError(filename, msg, lineno, offset, text)
return 1
except Exception:
reporter.unexpectedError(filename, 'problem decoding source')
return 1
# Okay, it's syntactically valid. Now check it.
w = checker.Checker(tree, filename)
w.messages.sort(key=lambda m: m.lineno)
for warning in w.messages:
reporter.flake(warning)
return len(w.messages)
def checkPath(filename, reporter=None):
"""
Check the given path, printing out any warnings detected.
@param reporter: A L{Reporter} instance, where errors and warnings will be
reported.
@return: the number of warnings printed
"""
if reporter is None:
reporter = modReporter._makeDefaultReporter()
try:
with open(filename, 'rb') as f:
codestr = f.read()
if sys.version_info < (2, 7):
codestr += '\n' # Work around for Python <= 2.6
except UnicodeError:
reporter.unexpectedError(filename, 'problem decoding source')
return 1
except IOError:
msg = sys.exc_info()[1]
reporter.unexpectedError(filename, msg.args[1])
return 1
return check(codestr, filename, reporter)
def iterSourceCode(paths):
"""
Iterate over all Python source files in C{paths}.
@param paths: A list of paths. Directories will be recursed into and
any .py files found will be yielded. Any non-directories will be
yielded as-is.
"""
for path in paths:
if os.path.isdir(path):
for dirpath, dirnames, filenames in os.walk(path):
for filename in filenames:
if filename.endswith('.py'):
yield os.path.join(dirpath, filename)
else:
yield path
def checkRecursive(paths, reporter):
"""
Recursively check all source files in C{paths}.
@param paths: A list of paths to Python source files and directories
containing Python source files.
@param reporter: A L{Reporter} where all of the warnings and errors
will be reported to.
@return: The number of warnings found.
"""
warnings = 0
for sourcePath in iterSourceCode(paths):
warnings += checkPath(sourcePath, reporter)
return warnings
def main(prog=None):
"""Entry point for the script "pyflakes"."""
import optparse
import signal
# Handle "Keyboard Interrupt" and "Broken pipe" gracefully
try:
signal.signal(signal.SIGINT, lambda sig, f: sys.exit('... stopped'))
signal.signal(signal.SIGPIPE, lambda sig, f: sys.exit(1))
except ValueError:
pass # SIGPIPE is not supported on Windows
parser = optparse.OptionParser(prog=prog, version=__version__)
(__, args) = parser.parse_args()
reporter = modReporter._makeDefaultReporter()
if args:
warnings = checkRecursive(args, reporter)
else:
warnings = check(sys.stdin.read(), '<stdin>', reporter)
raise SystemExit(warnings > 0)
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