mirror of https://github.com/python/cpython
61 lines
1.8 KiB
Python
61 lines
1.8 KiB
Python
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# This module compiles a regular expression that recognizes Python tokens.
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# It is designed to match the working of the Python tokenizer exactly.
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# It takes care of everything except indentation;
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# note that un-escaped newlines are tokens, too.
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# tokenprog.regs[3] gives the location of the token without whitespace
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# It also defines various subexpressions, but doesn't compile them.
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# See the function test() below for an example of how to use.
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import regex
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# Note: to get a quoted backslash in a regexp, it must be quadrupled.
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Ignore = '[ \t]*\(\\\\\n[ \t]*\)*\(#.*\)?'
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Name = '[a-zA-Z_][a-zA-Z0-9_]*'
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Hexnumber = '0[xX][0-9a-fA-F]*[lL]?'
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Octnumber = '0[0-7]*[lL]?'
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Decnumber = '[1-9][0-9]*[lL]?'
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Intnumber = Hexnumber + '\|' + Octnumber + '\|' + Decnumber
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Exponent = '[eE][-+]?[0-9]+'
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Pointfloat = '\([0-9]+\.[0-9]*\|\.[0-9]+\)\(' + Exponent + '\)?'
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Expfloat = '[0-9]+' + Exponent
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Floatnumber = Pointfloat + '\|' + Expfloat
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Number = Intnumber + '\|' + Floatnumber
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String = '\'\(\\\\.\|[^\\\n\']\)*\''
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Operator = '~\|\+\|-\|\*\|/\|%\|\^\|&\||\|<<\|>>\|==\|<=\|<>\|!=\|>=\|=\|<\|>'
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Bracket = '[][(){}]'
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Special = '[:;.,`\n]'
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Funny = Operator + '\|' + Bracket + '\|' + Special
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PlainToken = Name + '\|' + Number + '\|' + String + '\|' + Funny
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Token = Ignore + '\(' + PlainToken + '\)'
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try:
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save_syntax = regex.set_syntax(0) # Use default syntax
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tokenprog = regex.compile(Token)
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finally:
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dummy = regex.set_syntax(save_syntax) # Restore original syntax
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def test(file):
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f = open(file, 'r')
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while 1:
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line = f.readline()
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if not line: break
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i, n = 0, len(line)
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while i < n:
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j = tokenprog.match(line, i)
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if j < 0:
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print 'No token at', `line[i:i+20]` + '...'
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i = i+1
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else:
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i = i+j
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a, b = tokenprog.regs[3]
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if a < b:
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print 'Token:', `line[a:b]`
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