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#!/usr/bin/python
"""
Translate from PEP8 Python style to Mininet (i.e. Arista-like)
Python style
usage: unpep8 < old.py > new.py
- Reinstates CapWords for methods and instance variables
- Gets rid of triple single quotes
- Eliminates triple quotes on single lines
- Inserts extra spaces to improve readability
- Fixes Doxygen (or doxypy) ugliness
Does the following translations:
ClassName.method_name(foo = bar) -> ClassName.methodName( foo=bar )
Triple-single-quotes -> triple-double-quotes
@param foo description -> foo: description
@return description -> returns: description
@author me -> author: me
@todo(me) -> TODO(me)
Bugs/Limitations:
- Hack to restore strings is ugly
- Multiline strings get mangled
- Comments are mangled (which is arguably the "right thing" to do, except
that, for example, the left hand sides of the above would get translated!)
- Doesn't eliminate unnecessary backslashes
- Has no opinion on tab size
- complicated indented docstrings get flattened
- We don't (yet) have a filter to generate Doxygen/Doxypy
- Currently leaves indents on blank comment lines
- May lead to namespace collisions (e.g. some_thing and someThing)
Bob Lantz, rlantz@cs.stanford.edu
1/24/2010
"""
import re, sys
def fixUnderscoreTriplet( match ):
"Translate a matched triplet of the form a_b to aB."
triplet = match.group()
return triplet[ :-2 ] + triplet[ -1 ].capitalize()
def reinstateCapWords( text ):
underscoreTriplet = re.compile( r'[A-Za-z0-9]_[A-Za-z0-9]' )
return underscoreTriplet.sub( fixUnderscoreTriplet, text )
def replaceTripleApostrophes( text ):
"Replace triple apostrophes with triple quotes."
return text.replace( "'''", '"""')
def simplifyTripleQuotes( text ):
"Fix single-line doc strings."
r = re.compile( r'"""([^\"\n]+)"""' )
return r.sub( r'"\1"', text )
def insertExtraSpaces( text ):
"Insert extra spaces inside of parentheses and brackets/curly braces."
lparen = re.compile( r'\((?![\s\)])' )
text = lparen.sub( r'( ', text )
rparen = re.compile( r'([^\s\(])(?=\))' )
text = rparen.sub( r'\1 ', text)
# brackets
lbrack = re.compile( r'\[(?![\s\]])' )
text = lbrack.sub( r'[ ', text )
rbrack = re.compile( r'([^\s\[])(?=\])' )
text = rbrack.sub( r'\1 ', text)
# curly braces
lcurly = re.compile( r'\{(?![\s\}])' )
text = lcurly.sub( r'{ ', text )
rcurly = re.compile( r'([^\s\{])(?=\})' )
text = rcurly.sub( r'\1 ', text)
return text
def fixDoxygen( text ):
"""Translate @param foo to foo:, @return bar to returns: bar, and
@author me to author: me"""
param = re.compile( r'@param (\w+)' )
text = param.sub( r'\1:', text )
returns = re.compile( r'@return' )
text = returns.sub( r'returns:', text )
author = re.compile( r'@author' )
text = author.sub( r'author:', text)
# @todo -> TODO
text = text.replace( '@todo', 'TODO' )
return text
def removeCommentFirstBlankLine( text ):
"Remove annoying blank lines after first line in comments."
line = re.compile( r'("""[^\n]*\n)\s*\n', re.MULTILINE )
return line.sub( r'\1', text )
def fixArgs( match, kwarg = re.compile( r'(\w+) = ' ) ):
"Replace foo = bar with foo=bar."
return kwarg.sub( r'\1=', match.group() )
def fixKeywords( text ):
"Change keyword argumentsfrom foo = bar to foo=bar."
args = re.compile( r'\(([^\)]+)\)', re.MULTILINE )
return args.sub( fixArgs, text )
# Unfortunately, Python doesn't natively support balanced or recursive
# regular expressions. We could use PyParsing, but that opens another can
# of worms. For now, we just have a cheap hack to restore strings,
# so we don't end up accidentally mangling things like messages, search strings,
# and regular expressions.
def lineIter( text ):
"Simple iterator over lines in text."
for line in text.splitlines(): yield line
def stringIter( strList ):
"Yield strings in strList."
for s in strList: yield s
def restoreRegex( regex, old, new ):
"Find regexes in old and restore them into new."
oldStrs = regex.findall( old )
# Sanity check - count should be the same!
newStrs = regex.findall( new )
assert len( oldStrs ) == len( newStrs )
# Replace newStrs with oldStrs
siter = stringIter( oldStrs )
reps = lambda dummy: siter.next()
return regex.sub( reps, new )
# This is a cheap hack, and it may not work 100%, since
# it doesn't handle multiline strings.
# However, it should be mostly harmless...
def restoreStrings( oldText, newText ):
"Restore strings from oldText into newText, returning result."
oldLines, newLines = lineIter( oldText ), lineIter( newText )
quoteStrings = re.compile( r'("[^"]*")' )
tickStrings = re.compile( r"('[^']*')" )
result = ''
# It would be nice if we could blast the whole file, but for
# now it seems to work line-by-line
for newLine in newLines:
oldLine = oldLines.next()
newLine = restoreRegex( quoteStrings, oldLine, newLine )
newLine = restoreRegex( tickStrings, oldLine, newLine )
result += newLine + '\n'
return result
# This might be slightly controversial, since it uses
# three spaces to line up multiline comments. However,
# I much prefer it. Limitations: if you have deeper
# indents in comments, they will be eliminated. ;-(
def fixComment( match,
indentExp=re.compile( r'\n([ ]*)(?=[^/s])', re.MULTILINE ),
trailingQuotes=re.compile( r'\s+"""' ) ):
"Re-indent comment, and join trailing quotes."
originalIndent = match.group( 1 )
comment = match.group( 2 )
indent = '\n' + originalIndent
# Exception: leave unindented things unindented!
if len( originalIndent ) is not 0: indent += ' '
comment = indentExp.sub( indent, comment )
return originalIndent + trailingQuotes.sub( '"""', comment )
def fixCommentIndents( text ):
"Fix multiline comment indentation."
comments = re.compile( r'^([ ]*)("""[^"]*""")$', re.MULTILINE )
return comments.sub( fixComment, text )
def removeBogusLinefeeds( text ):
"Remove extra linefeeds at the end of single-line comments."
bogusLfs = re.compile( r'"([^"\n]*)\n"', re.MULTILINE )
return bogusLfs.sub( '"\1"', text)
def convertFromPep8( program ):
oldProgram = program
# Program text transforms
program = reinstateCapWords( program )
program = fixKeywords( program )
program = insertExtraSpaces( program )
# Undo string damage
program = restoreStrings( oldProgram, program )
# Docstring transforms
program = replaceTripleApostrophes( program )
program = simplifyTripleQuotes( program )
program = fixDoxygen( program )
program = fixCommentIndents( program )
program = removeBogusLinefeeds( program )
# Destructive transforms (these can delete lines)
program = removeCommentFirstBlankLine( program )
return program
if __name__ == '__main__':
print convertFromPep8( sys.stdin.read() )