strscan.Scanner is a near-direct port of Ruby's
The aim is to provide for lexical scanning operations on strings:
>>> from strscan import Scanner >>> s = Scanner("This is an example string") >>> s.eos() False >>> s.scan(r'\w+') 'This' >>> s.scan(r'\w+') >>> s.scan(r'\s+') ' ' >>> s.scan(r'\s+') >>> s.scan(r'\w+') 'is' >>> s.eos() False >>> s.scan(r'\s+') ' ' >>> s.scan(r'\w+') 'an' >>> s.scan(r'\s+') ' ' >>> s.scan(r'\w+') 'example' >>> s.scan(r'\s+') ' ' >>> s.scan(r'\w+') 'string' >>> s.eos() True >>> s.scan(r'\s+') >>> s.scan(r'\w+')
Its mechanism of operation is similar to
StringIO, only instead of reading
by passing a number of bytes, you read by passing a regex. A scan pointer
tracks the current position through the string, and all scanning or searching
happens on the rest of the string after this pointer.
scan is the simple
case of reading some text and advancing the scan pointer, but there are several
other related methods which fulfil different requirements.
All the methods on
Scanner which take regexes will accept either regex
strings or compiled pattern objects (as would be returned from
There's also a useful function provided,
text_coords(), which resolves
simple string indices into textual co-ordinates (line number and column):
>>> s = "abcdef\nghijkl\nmnopqr\nstuvwx\nyz" >>> text_coords(s, 0) (0, 0, 'abcdef') >>> text_coords(s, 4) (0, 4, 'abcdef') >>> text_coords(s, 6) (0, 6, 'abcdef') >>> text_coords(s, 7) (1, 0, 'ghijkl') >>> text_coords(s, 11) (1, 4, 'ghijkl') >>> text_coords(s, 15) (2, 1, 'mnopqr')
You can get the module from PyPI:
pip install strscan
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