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1"""
2Provide the Reporter class.
3"""
4
5import re
6import sys
7
8
9class Reporter:
10 """
11 Formats the results of pyflakes checks to users.
12 """
13
14 def __init__(self, warningStream, errorStream):
15 """
16 Construct a L{Reporter}.
17
18 @param warningStream: A file-like object where warnings will be
19 written to. The stream's C{write} method must accept unicode.
20 C{sys.stdout} is a good value.
21 @param errorStream: A file-like object where error output will be
22 written to. The stream's C{write} method must accept unicode.
23 C{sys.stderr} is a good value.
24 """
25 self._stdout = warningStream
26 self._stderr = errorStream
27
28 def unexpectedError(self, filename, msg):
29 """
30 An unexpected error occurred trying to process C{filename}.
31
32 @param filename: The path to a file that we could not process.
33 @ptype filename: C{unicode}
34 @param msg: A message explaining the problem.
35 @ptype msg: C{unicode}
36 """
37 self._stderr.write(f"{filename}: {msg}\n")
38
39 def syntaxError(self, filename, msg, lineno, offset, text):
40 """
41 There was a syntax error in C{filename}.
42
43 @param filename: The path to the file with the syntax error.
44 @ptype filename: C{unicode}
45 @param msg: An explanation of the syntax error.
46 @ptype msg: C{unicode}
47 @param lineno: The line number where the syntax error occurred.
48 @ptype lineno: C{int}
49 @param offset: The column on which the syntax error occurred, or None.
50 @ptype offset: C{int}
51 @param text: The source code containing the syntax error.
52 @ptype text: C{unicode}
53 """
54 if text is None:
55 line = None
56 else:
57 line = text.splitlines()[-1]
58
59 # lineno might be None if the error was during tokenization
60 # lineno might be 0 if the error came from stdin
61 lineno = max(lineno or 0, 1)
62
63 if offset is not None:
64 # some versions of python emit an offset of -1 for certain encoding errors
65 offset = max(offset, 1)
66 self._stderr.write('%s:%d:%d: %s\n' %
67 (filename, lineno, offset, msg))
68 else:
69 self._stderr.write('%s:%d: %s\n' % (filename, lineno, msg))
70
71 if line is not None:
72 self._stderr.write(line)
73 self._stderr.write('\n')
74 if offset is not None:
75 self._stderr.write(re.sub(r'\S', ' ', line[:offset - 1]) +
76 "^\n")
77
78 def flake(self, message):
79 """
80 pyflakes found something wrong with the code.
81
82 @param: A L{pyflakes.messages.Message}.
83 """
84 self._stdout.write(str(message))
85 self._stdout.write('\n')
86
87
88def _makeDefaultReporter():
89 """
90 Make a reporter that can be used when no reporter is specified.
91 """
92 return Reporter(sys.stdout, sys.stderr)