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274 lines
9.2 KiB
Python
274 lines
9.2 KiB
Python
"""
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Try to detect suspicious constructs, resembling markup
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that has leaked into the final output.
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Suspicious lines are reported in a comma-separated-file,
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``suspicious.csv``, located in the output directory.
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The file is utf-8 encoded, and each line contains four fields:
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* document name (normalized)
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* line number in the source document
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* problematic text
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* complete line showing the problematic text in context
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It is common to find many false positives. To avoid reporting them
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again and again, they may be added to the ``ignored.csv`` file
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(located in the configuration directory). The file has the same
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format as ``suspicious.csv`` with a few differences:
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- each line defines a rule; if the rule matches, the issue
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is ignored.
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- line number may be empty (that is, nothing between the
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commas: ",,"). In this case, line numbers are ignored (the
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rule matches anywhere in the file).
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- the last field does not have to be a complete line; some
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surrounding text (never more than a line) is enough for
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context.
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Rules are processed sequentially. A rule matches when:
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* document names are the same
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* problematic texts are the same
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* line numbers are close to each other (5 lines up or down)
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* the rule text is completely contained into the source line
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The simplest way to create the ignored.csv file is by copying
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undesired entries from suspicious.csv (possibly trimming the last
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field.)
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Copyright 2009 Gabriel A. Genellina
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"""
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import os
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import re
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import csv
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import sys
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from docutils import nodes
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from sphinx.builders import Builder
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detect_all = re.compile(r'''
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::(?=[^=])| # two :: (but NOT ::=)
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:[a-zA-Z][a-zA-Z0-9]+| # :foo
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`| # ` (seldom used by itself)
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(?<!\.)\.\.[ \t]*\w+: # .. foo: (but NOT ... else:)
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''', re.UNICODE | re.VERBOSE).finditer
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py3 = sys.version_info >= (3, 0)
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class Rule:
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def __init__(self, docname, lineno, issue, line):
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"""A rule for ignoring issues"""
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self.docname = docname # document to which this rule applies
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self.lineno = lineno # line number in the original source;
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# this rule matches only near that.
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# None -> don't care
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self.issue = issue # the markup fragment that triggered this rule
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self.line = line # text of the container element (single line only)
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self.used = False
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def __repr__(self):
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return '{0.docname},,{0.issue},{0.line}'.format(self)
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class dialect(csv.excel):
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"""Our dialect: uses only linefeed as newline."""
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lineterminator = '\n'
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class CheckSuspiciousMarkupBuilder(Builder):
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"""
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Checks for possibly invalid markup that may leak into the output.
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"""
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name = 'suspicious'
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def init(self):
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# create output file
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self.log_file_name = os.path.join(self.outdir, 'suspicious.csv')
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open(self.log_file_name, 'w').close()
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# load database of previously ignored issues
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self.load_rules(os.path.join(os.path.dirname(__file__), '..',
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'susp-ignored.csv'))
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def get_outdated_docs(self):
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return self.env.found_docs
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def get_target_uri(self, docname, typ=None):
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return ''
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def prepare_writing(self, docnames):
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pass
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def write_doc(self, docname, doctree):
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# set when any issue is encountered in this document
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self.any_issue = False
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self.docname = docname
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visitor = SuspiciousVisitor(doctree, self)
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doctree.walk(visitor)
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def finish(self):
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unused_rules = [rule for rule in self.rules if not rule.used]
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if unused_rules:
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self.warn('Found %s/%s unused rules:' %
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(len(unused_rules), len(self.rules)))
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for rule in unused_rules:
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self.info(repr(rule))
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return
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def check_issue(self, line, lineno, issue):
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if not self.is_ignored(line, lineno, issue):
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self.report_issue(line, lineno, issue)
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def is_ignored(self, line, lineno, issue):
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"""Determine whether this issue should be ignored."""
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docname = self.docname
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for rule in self.rules:
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if rule.docname != docname: continue
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if rule.issue != issue: continue
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# Both lines must match *exactly*. This is rather strict,
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# and probably should be improved.
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# Doing fuzzy matches with levenshtein distance could work,
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# but that means bringing other libraries...
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# Ok, relax that requirement: just check if the rule fragment
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# is contained in the document line
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if rule.line not in line: continue
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# Check both line numbers. If they're "near"
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# this rule matches. (lineno=None means "don't care")
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if (rule.lineno is not None) and \
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abs(rule.lineno - lineno) > 5: continue
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# if it came this far, the rule matched
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rule.used = True
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return True
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return False
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def report_issue(self, text, lineno, issue):
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if not self.any_issue: self.info()
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self.any_issue = True
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self.write_log_entry(lineno, issue, text)
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if py3:
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self.warn('[%s:%d] "%s" found in "%-.120s"' %
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(self.docname, lineno, issue, text))
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else:
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self.warn('[%s:%d] "%s" found in "%-.120s"' % (
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self.docname.encode(sys.getdefaultencoding(),'replace'),
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lineno,
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issue.encode(sys.getdefaultencoding(),'replace'),
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text.strip().encode(sys.getdefaultencoding(),'replace')))
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self.app.statuscode = 1
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def write_log_entry(self, lineno, issue, text):
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if py3:
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f = open(self.log_file_name, 'a')
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writer = csv.writer(f, dialect)
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writer.writerow([self.docname, lineno, issue, text.strip()])
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f.close()
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else:
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f = open(self.log_file_name, 'ab')
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writer = csv.writer(f, dialect)
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writer.writerow([self.docname.encode('utf-8'),
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lineno,
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issue.encode('utf-8'),
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text.strip().encode('utf-8')])
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f.close()
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def load_rules(self, filename):
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"""Load database of previously ignored issues.
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A csv file, with exactly the same format as suspicious.csv
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Fields: document name (normalized), line number, issue, surrounding text
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"""
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self.info("loading ignore rules... ", nonl=1)
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self.rules = rules = []
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try:
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if py3:
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f = open(filename, 'r')
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else:
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f = open(filename, 'rb')
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except IOError:
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return
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for i, row in enumerate(csv.reader(f)):
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if len(row) != 4:
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raise ValueError(
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"wrong format in %s, line %d: %s" % (filename, i+1, row))
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docname, lineno, issue, text = row
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if lineno:
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lineno = int(lineno)
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else:
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lineno = None
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if not py3:
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docname = docname.decode('utf-8')
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issue = issue.decode('utf-8')
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text = text.decode('utf-8')
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rule = Rule(docname, lineno, issue, text)
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rules.append(rule)
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f.close()
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self.info('done, %d rules loaded' % len(self.rules))
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def get_lineno(node):
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"""Obtain line number information for a node."""
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lineno = None
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while lineno is None and node:
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node = node.parent
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lineno = node.line
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return lineno
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def extract_line(text, index):
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"""text may be a multiline string; extract
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only the line containing the given character index.
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>>> extract_line("abc\ndefgh\ni", 6)
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>>> 'defgh'
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>>> for i in (0, 2, 3, 4, 10):
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... print extract_line("abc\ndefgh\ni", i)
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abc
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abc
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abc
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defgh
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defgh
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i
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"""
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p = text.rfind('\n', 0, index) + 1
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q = text.find('\n', index)
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if q < 0:
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q = len(text)
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return text[p:q]
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class SuspiciousVisitor(nodes.GenericNodeVisitor):
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lastlineno = 0
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def __init__(self, document, builder):
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nodes.GenericNodeVisitor.__init__(self, document)
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self.builder = builder
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def default_visit(self, node):
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if isinstance(node, (nodes.Text, nodes.image)): # direct text containers
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text = node.astext()
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# lineno seems to go backwards sometimes (?)
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self.lastlineno = lineno = max(get_lineno(node) or 0, self.lastlineno)
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seen = set() # don't report the same issue more than only once per line
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for match in detect_all(text):
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issue = match.group()
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line = extract_line(text, match.start())
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if (issue, line) not in seen:
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self.builder.check_issue(line, lineno, issue)
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seen.add((issue, line))
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unknown_visit = default_visit
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def visit_document(self, node):
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self.lastlineno = 0
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def visit_comment(self, node):
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# ignore comments -- too much false positives.
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# (although doing this could miss some errors;
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# there were two sections "commented-out" by mistake
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# in the Python docs that would not be caught)
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raise nodes.SkipNode
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