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parse/parse.py
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Richard Jones 0f90590418 doc improvements; cleanup of the locals()-related hax
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#
# $Id$
# $HeadURL$
#
'''Parse strings using a specification based on the Python format() syntax.
parse() is the opposite of format()
Basic usage:
>>> from parse import * # only exports parse() and compile()
>>> parse("It's {}, I love it!", "It's spam, I love it!")
<Result ('spam',) {}>
>>> p = compile("It's {}, I love it!")
>>> print p
<Parser "It's {}, I love it!">
>>> p.parse("It's spam, I love it!")
<Result ('spam',) {}>
Format Syntax
-------------
A basic version of the `Format String Syntax`_ is supported with anonymous
(fixed-position), named and formatted fields::
{[field name]:[format spec]}
Field names must be a single Python identifier word. No attributes or
element indexes are supported (as they would make no sense.)
Numbered fields are also not supported: the result of parsing will include
the parsed fields in the order they are parsed.
The conversion of fields to types other than strings is done based on the
type in the format specification, which mirrors the format() behaviour.
There are no "!" field conversions like format() has.
Some simple parse() format string examples:
>>> parse("Bring me a {}", "Bring me a shrubbery")
<Result ('shrubbery',) {}>
>>> r = parse("The {} who say {}", "The knights who say Ni!")
>>> print r
<Result ('knights', 'Ni!') {}>
>>> print r.fixed
('knights', 'Ni!')
>>> r = parse("Bring out the holy {item}", "Bring out the holy hand grenade")
>>> print r
<Result () {'item': 'hand grenade'}>
>>> print r.named
{'item': 'hand grenade'}
Format Specification
--------------------
Do remember that most often a straight format-less {} will suffice
where a more complex format specification might have been used.
Most of the `Format Specification Mini-Language`_ is supported::
[[fill]align][0][width][type]
The align operators will cause spaces (or specified fill character)
to be stripped from the value. Similarly width is not enforced; it
just indicates there may be whitespace or "0"s to strip.
The "#" format character is handled automatically by d, b, o and x -
that is: if there is a "0b", "0o" or "0x" prefix respectively, it's
handled. For "d" any will be accepted, but for the others the correct
prefix must be present if at all. Similarly number sign is handled
automatically.
The types supported are a slightly different mix to the format() types.
Some format() types come directly over: d, n, %, f, e, b, o and x.
In addition some regular expression character group types
D, w, W, s and S are also available.
The "e" and "g" types are case-insensitive so there is not need for
the "E" or "G" types.
===== =========================================== ========
Type Characters Matched Output
===== =========================================== ========
w Letters and underscore str
W Non-letter and underscore str
s Whitespace str
S Non-whitespace str
d Digits (effectively integer numbers) int
D Non-digit str
n Numbers with thousands separators (, or .) int
% Percentage (converted to value/100.0) float
f Fixed-point numbers float
e Floating-point numbers with exponent float
e.g. 1.1e-10, NAN (all case insensitive)
g General number format (either d, f or e) float
b Binary numbers int
o Octal numbers int
x Hexadecimal numbers (lower and upper case) int
ti ISO 8601 format date/time datetime
e.g. 1972-01-20T10:21:36Z
te RFC2822 e-mail format date/time datetime
e.g. Mon, 20 Jan 1972 10:21:36 +1000
tg Global (day/month) format date/time datetime
e.g. 20/1/1972 10:21:36 AM +1:00
ta US (month/day) format date/time datetime
e.g. 1/20/1972 10:21:36 PM +10:30
tc ctime() format date/time datetime
e.g. Sun Sep 16 01:03:52 1973
th HTTP log format date/time datetime
e.g. 21/Nov/2011:00:07:11 +0000
tt Time time
e.g. 10:21:36 PM -5:30
===== =========================================== ========
So, for example, some typed parsing, and None resulting if the typing
does not match:
>>> parse('Our {:d} {:w} are...', 'Our 3 weapons are...')
<Result (3, 'weapons') {}>
>>> parse('Our {:d} {:w} are...', 'Our three weapons are...')
None
>>> parse('Meet at {:tg}', 'Meet at 11/11/2011 11:11')
<Result (datetime.datetime(2011, 11, 11, 11, 11),) {}>
And messing about with alignment:
>>> parse('with {:>} herring', 'with a herring')
<Result ('a',) {}>
>>> parse('spam {:^} spam', 'spam lovely spam')
<Result ('lovely',) {}>
Note that the "center" alignment does not test to make sure the value is
actually centered. It just strips leading and trailing whitespace.
See also the unit tests at the end of the module for some more
examples. Run the tests with "python -m parse".
Some notes for the date and time types:
- the presence of the time part is optional (including ISO 8601, starting
at the "T"). A full datetime object will always be returned; the time
will be set to 00:00:00. You may also specify a time without seconds.
- when a seconds amount is present in the input fractions will be parsed
to give microseconds.
- except in ISO 8601 the day and month digits may be 0-padded.
- the date separator for the tg and ta formats may be "-" or "/".
- named months (abbreviations or full names) may be used in the ta and tg
formats in place of numeric months.
- as per RFC 2822 the e-mail format may omit the day (and comma), and the
seconds but nothing else.
- hours greater than 12 will be happily accepted.
- the AM/PM are optional, and if PM is found then 12 hours will be added
to the datetime object's hours amount - even if the hour is greater
than 12 (for consistency.)
- except in ISO 8601 and e-mail format the timezone is optional.
- named timezones are not handled yet.
Note: attempting to match too many datetime fields in a single parse() will
currently result in a resource allocation issue. A TooManyFields exception
will be raised in this instance. The current limit is about 15.
.. _`Format String Syntax`: http://docs.python.org/library/string.html#format-string-syntax
.. _`Format Specification Mini-Language`: http://docs.python.org/library/string.html#format-specification-mini-language
Result Objects
--------------
The result of a ``parse()`` operation is either ``None`` (no match) or a
``Result`` instance.
The ``Result`` instance has three attributes:
fixed
A tuple of the fixed-position, anonymous fields extracted from the input.
named
A dictionary of the named fields extracted from the input.
spans
A dictionary mapping the names and fixed position indices matched to a
2-tuple slice range of where the match occurred in the input.
The span does not include any stripped padding (alignment or width).
----
**Version history (in brief)**:
- 1.1.9 to keep things simpler number sign is handled automatically;
significant robustification in the face of edge-case input.
- 1.1.8 allow "d" fields to have number base "0x" etc. prefixes;
fix up some field type interactions after stress-testing the parser;
implement "%" type.
- 1.1.7 Python 3 compatibility tweaks (2.5 to 2.7 and 3.2 are supported).
- 1.1.6 add "e" and "g" field types; removed redundant "h" and "X";
removed need for explicit "#".
- 1.1.5 accept textual dates in more places; Result now holds match span
positions.
- 1.1.4 fixes to some int type conversion; implemented "=" alignment; added
date/time parsing with a variety of formats handled.
- 1.1.3 type conversion is automatic based on specified field types. Also added
"f" and "n" types.
- 1.1.2 refactored, added compile() and limited ``from parse import *``
- 1.1.1 documentation improvements
- 1.1.0 implemented more of the `Format Specification Mini-Language`_
and removed the restriction on mixing fixed-position and named fields
- 1.0.0 initial release
This code is copyright 2011 eKit.com Inc (http://www.ekit.com/)
See the end of the source file for the license of use.
'''
__version__ = '1.1.9'
import re
import unittest
from datetime import datetime, time, tzinfo, timedelta
from functools import partial
__all__ = 'parse compile'.split()
def int_convert(base):
'''Convert a string to an integer.
The string may start with a sign.
It may be of a base other than 10.
It may also have other non-numeric characters that we can ignore.
'''
CHARS = '0123456789abcdefghijklmnopqrstuvwxyz'
def f(string, match, base=base):
if string[0] == '-':
sign = -1
else:
sign = 1
if string[0] == '0':
if string[1] in 'bB':
base = 2
elif string[1] in 'oO':
base = 8
elif string[1] in 'xX':
base = 16
else:
# just go with the base specifed
pass
chars = CHARS[:base]
string = re.sub('[^%s]' % chars, '', string.lower())
return sign * int(string, base)
return f
def percentage(string, match):
return float(string[:-1]) / 100.
class FixedTzOffset(tzinfo):
"""Fixed offset in minutes east from UTC.
"""
def __init__(self, offset, name):
self._offset = timedelta(minutes = offset)
self._name = name
def __repr__(self):
return '<%s %s %s>' % (self.__class__.__name__, self._name, self._offset)
def utcoffset(self, dt):
return self._offset
def tzname(self, dt):
return self._name
def dst(self, dt):
return ZERO
def __eq__(self, other):
return self._name == other._name and self._offset == other._offset
MONTHS_MAP = dict(
Jan=1, January=1,
Feb=2, February=2,
Mar=3, March=3,
Apr=4, April=4,
May=5,
Jun=6, June=6,
Jul=7, July=7,
Aug=8, August=8,
Sep=9, September=9,
Oct=10, October=10,
Nov=11, November=11,
Dec=12, December=12
)
DAYS_PAT = '(Mon|Tue|Wed|Thu|Fri|Sat|Sun)'
MONTHS_PAT = '(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)'
ALL_MONTHS_PAT = '(%s)' % '|'.join(MONTHS_MAP)
TIME_PAT = r'(\d{1,2}:\d{1,2}(:\d{1,2}(\.\d+)?)?)'
AM_PAT = r'(\s+[AP]M)'
TZ_PAT = r'(\s+[-+]\d\d?:?\d\d)'
def date_convert(string, match, ymd=None, mdy=None, dmy=None,
d_m_y=None, hms=None, am=None, tz=None):
'''Convert the incoming string containing some date / time info into a
datetime instance.
'''
groups = match.groups()
time_only = False
if ymd is not None:
y, m, d = re.split('[-/\s]', groups[ymd])
elif mdy is not None:
m, d, y = re.split('[-/\s]', groups[mdy])
elif dmy is not None:
d, m, y = re.split('[-/\s]', groups[dmy])
elif d_m_y is not None:
d, m, y = d_m_y
d = groups[d]
m = groups[m]
y = groups[y]
else:
time_only = True
H = M = S = u = 0
if hms is not None and groups[hms]:
t = groups[hms].split(':')
if len(t) == 2:
H, M = t
else:
H, M, S = t
if '.' in S:
S, u = S.split('.')
u = int(float('.' + u) * 1000000)
S = int(S)
H = int(H)
M = int(M)
if am is not None:
am = groups[am]
if am and am.strip() == 'PM':
H += 12
if tz is not None:
tz = groups[tz]
if tz == 'Z':
tz = FixedTzOffset(0, 'UTC')
elif tz:
tz = tz.strip()
if tz.isupper():
# TODO use the awesome python TZ module?
TODO
else:
sign = tz[0]
if ':' in tz:
tzh, tzm = tz[1:].split(':')
else:
tzh, tzm = tz[1:3], tz[3:5]
offset = int(tzm) + int(tzh) * 60
if sign == '-':
offset = -offset
tz = FixedTzOffset(offset, tz)
if time_only:
d = time(H, M, S, u, tzinfo=tz)
else:
y = int(y)
if m.isdigit():
m = int(m)
else:
m = MONTHS_MAP[m]
d = int(d)
d = datetime(y, m, d, H, M, S, u, tzinfo=tz)
return d
class TooManyFields(ValueError):
pass
# note: {} are handled separately
REGEX_SAFETY = re.compile(r'([\\.[\]()*+\^$!])')
# allowed field types
ALLOWED_TYPES = set(list('nbox%fegwWdDsS') +
['t'+c for c in 'ieahgct'])
def extract_format(format):
'''Pull apart the format [[fill]align][0][width][type]
'''
fill = align = None
if format[0] in '<>=^':
align = format[0]
format = format[1:]
elif len(format) > 1 and format[1] in '<>=^':
fill = format[0]
align = format[1]
format = format[2:]
zero = False
if format and format[0] == '0':
zero = True
format = format[1:]
width = ''
while format:
if not format[0].isdigit():
break
width += format[0]
format = format[1:]
# the rest is the type
type = format
if type and type not in ALLOWED_TYPES:
raise ValueError('type %r not recognised' % type)
return locals()
PARSE_RE = re.compile('({{|}}|{}|{:[^}]+?}|{\w+?}|{\w+?:[^}]+?})')
class Parser(object):
def __init__(self, format):
self._fixed_fields = []
self._named_fields = []
self._group_index = 0
self._format = format
self._type_conversions = {}
self._expression = self.generate_expression()
try:
# yes, I now have two problems
self._re = re.compile(self._expression, re.IGNORECASE|re.DOTALL)
except AssertionError, e:
if str(e).endswith('this version only supports 100 named groups'):
raise TooManyFields('sorry, you are attempting to parse too '
'many complex fields')
def __repr__(self):
if len(self._format) > 20:
return '<%s %r>' % (self.__class__.__name__, self._format[:17] + '...')
return '<%s %r>' % (self.__class__.__name__, self._format)
def parse(self, string):
m = self._re.match(string)
if m is None:
return None
# ok, figure the fixed fields we've pulled out and type convert them
fixed_fields = list(m.groups())
for n in self._fixed_fields:
if n in self._type_conversions:
fixed_fields[n] = self._type_conversions[n](fixed_fields[n], m)
fixed_fields = tuple(fixed_fields[n] for n in self._fixed_fields)
# grab the named fields, converting where requested
groupdict = m.groupdict()
named_fields = {}
for k in self._named_fields:
if k in self._type_conversions:
named_fields[k] = self._type_conversions[k](groupdict[k], m)
else:
named_fields[k] = groupdict[k]
# now figure the match spans
spans = dict((n, m.span(n)) for n in named_fields)
spans.update((i, m.span(n+1)) for i, n in enumerate(self._fixed_fields))
# and that's our result
return Result(fixed_fields, named_fields, spans)
def re_replace(self, match):
return '\\' + match.group(1)
def generate_expression(self):
# turn my _format attribute into the _expression attribute
e = []
for part in PARSE_RE.split(self._format):
if not part:
continue
elif part == '{{':
e.append(r'\{')
elif part == '}}':
e.append(r'\}')
elif part[0] == '{':
# this will be a braces-delimited field to handle
e.append(self.handle_field(part))
else:
# just some text to match
e.append(REGEX_SAFETY.sub(self.re_replace, part))
return '^%s$' % ''.join(e)
def handle_field(self, field):
# first: lose the braces
field = field[1:-1]
# now figure whether this is an anonymous or named field, and whether
# there's any format specification
format = ''
if field and field[0].isalpha():
if ':' in field:
name, format = field.split(':')
else:
name = field
self._named_fields.append(name)
group = name
wrap = '(?P<%s>%%s)' % name
else:
self._fixed_fields.append(self._group_index)
wrap = '(%s)'
if ':' in field:
format = field[1:]
group = self._group_index
# simplest case: a bare {}
if not format:
self._group_index += 1
return wrap % '.+?'
# decode the format specification
format = extract_format(format)
# figure type conversions, if any
type = format['type']
is_numeric = type and type in 'n%fegdobh'
if type == 'n':
s = '\d{1,3}([,.]\d{3})*'
self._group_index += 1
self._type_conversions[group] = int_convert(10)
elif type == 'b':
s = '(0[bB])?[01]+'
self._type_conversions[group] = int_convert(2)
self._group_index += 1
elif type == 'o':
s = '(0[oO])?[0-7]+'
self._type_conversions[group] = int_convert(8)
self._group_index += 1
elif type == 'x':
s = '(0[xX])?[0-9a-fA-F]+'
self._type_conversions[group] = int_convert(16)
self._group_index += 1
elif type == '%':
s = r'\d+(\.\d+)?%'
self._group_index += 1
self._type_conversions[group] = percentage
elif type == 'f':
s = r'\d+\.\d+'
self._type_conversions[group] = lambda s, m: float(s)
elif type == 'e':
s = r'\d+\.\d+[eE][-+]?\d+|nan|NAN|[-+]?inf|[-+]?INF'
self._type_conversions[group] = lambda s, m: float(s)
elif type == 'g':
s = r'\d+(\.\d+)?([eE][-+]?\d+)?|nan|NAN|[-+]?inf|[-+]?INF'
self._group_index += 2
self._type_conversions[group] = lambda s, m: float(s)
elif type == 'd':
s = r'\d+|0[xX][0-9a-fA-F]+|[0-9a-fA-F]+|0[bB][01]+|0[oO][0-7]+'
self._type_conversions[group] = int_convert(10)
elif type == 'ti':
s = r'(\d{4}-\d\d-\d\d)((\s+|T)%s)?(Z|[-+]\d\d:\d\d)?' % TIME_PAT
n = self._group_index
self._type_conversions[group] = partial(date_convert, ymd=n,
hms=n+3, tz=n+6)
self._group_index += 7
wrap = ''
elif type == 'tg':
s = r'(\d{1,2}[-/](\d{1,2}|%s)[-/]\d{4})(\s+%s)?%s?%s?' % (
ALL_MONTHS_PAT, TIME_PAT, AM_PAT, TZ_PAT)
n = self._group_index
self._type_conversions[group] = partial(date_convert, dmy=n,
hms=n+4, am=n+7, tz=n+8)
self._group_index += 9
wrap = ''
elif type == 'ta':
s = r'((\d{1,2}|%s)[-/]\d{1,2}[-/]\d{4})(\s+%s)?%s?%s?' % (
ALL_MONTHS_PAT, TIME_PAT, AM_PAT, TZ_PAT)
n = self._group_index
self._type_conversions[group] = partial(date_convert, mdy=n,
hms=n+4, am=n+7, tz=n+8)
self._group_index += 9
wrap = ''
elif type == 'te':
# this will allow microseconds through if they're present, but meh
s = r'(%s,\s+)?(\d{1,2}\s+%s\s+\d{4})\s+%s%s' % (DAYS_PAT,
MONTHS_PAT, TIME_PAT, TZ_PAT)
n = self._group_index
self._type_conversions[group] = partial(date_convert, dmy=n+2,
hms=n+4, tz=n+7)
self._group_index += 8
wrap = ''
elif type == 'th':
# slight flexibility here from the stock Apache format
s = r'(\d{1,2}[-/]%s[-/]\d{4}):%s%s' % (MONTHS_PAT, TIME_PAT,
TZ_PAT)
n = self._group_index
self._type_conversions[group] = partial(date_convert, dmy=n,
hms=n+2, tz=n+5)
self._group_index += 6
wrap = ''
elif type == 'tc':
s = r'(%s)\s+%s\s+(\d{1,2})\s+%s\s+(\d{4})' % (
DAYS_PAT, MONTHS_PAT, TIME_PAT)
n = self._group_index
self._type_conversions[group] = partial(date_convert,
d_m_y=(n+3,n+2,n+7), hms=n+4)
self._group_index += 8
wrap = ''
elif type == 'tt':
s = r'%s?%s?%s?' % (TIME_PAT, AM_PAT, TZ_PAT)
n = self._group_index
self._type_conversions[group] = partial(date_convert, hms=n,
am=n+3, tz=n+4)
self._group_index += 5
wrap = ''
elif type:
s = r'\%s+' % type
else:
s = '.+?'
align = format['align']
fill = format['fill']
# handle some numeric-specific things like fill and sign
if is_numeric:
# prefix with something (align "=" trumps zero)
if align == '=':
# special case - align "=" acts like the zero above but with
# configurable fill defaulting to "0"
if not fill:
fill = '0'
s = '%s*' % fill + s
elif format['zero']:
s = '0*' + s
# allow numbers to be prefixed with a sign
s = r'[-+ ]?' + s
if not fill:
fill = ' '
# Place into a group now - this captures the value we want to keep.
# Everything else from now is just padding to be stripped off
if wrap:
s = wrap % s
self._group_index += 1
if format['width']:
# all we really care about is that if the format originally
# specified a width then there will probably be padding - without an
# explicit alignment that'll mean right alignment with spaces
# padding
if not align:
align = '>'
if fill in '.\+?*[](){}^$':
fill = '\\' + fill
# align "=" has been handled
if align == '<':
s = '%s%s*' % (s, fill)
elif align == '>':
s = '%s*%s' % (fill, s)
elif align == '^':
s = '%s*%s%s*' % (fill, s, fill)
return s
class Result(object):
def __init__(self, fixed, named, spans):
self.fixed = fixed
self.named = named
self.spans = spans
def __repr__(self):
return '<%s %r %r>' % (self.__class__.__name__, self.fixed,
self.named)
def parse(format, string):
'''Using "format" attempt to pull values from "string".
The return value will be an object with two attributes:
.fixed - tuple of fixed-position values from the string
.named - dict of named values from the string
If the format is invalid a ValueError will be raised.
In the case there is no match parse() will return None.
'''
return Parser(format).parse(string)
def compile(format):
'''Create a Parser instance to parse "format".
The resultant Parser has a method .parse(string) which
behaves in the same manner as parse(format, string).
Use this function if you intend to parse many strings
with the same format.
'''
return Parser(format)
# yes, I now unit test both of the problems
class TestPattern(unittest.TestCase):
def _test_expression(self, format, expression):
self.assertEqual(Parser(format)._expression, expression)
def test_braces(self):
'pull a simple string out of another string'
self._test_expression('{{ }}', '^\{ \}$')
def test_fixed(self):
'pull a simple string out of another string'
self._test_expression('{}', '^(.+?)$')
self._test_expression('{} {}', '^(.+?) (.+?)$')
def test_named(self):
'pull a named string out of another string'
self._test_expression('{name}', '^(?P<name>.+?)$')
self._test_expression('{name} {other}',
'^(?P<name>.+?) (?P<other>.+?)$')
def test_named_typed(self):
'pull a named string out of another string'
self._test_expression('{name:w}', '^(?P<name>\w+)$')
self._test_expression('{name:w} {other:w}',
'^(?P<name>\w+) (?P<other>\w+)$')
def test_beaker(self):
'skip some trailing whitespace'
self._test_expression('{:<}', '^(.+?) *$')
def test_left_fill(self):
'skip some trailing periods'
self._test_expression('{:.<}', '^(.+?)\.*$')
def test_bird(self):
'skip some trailing whitespace'
self._test_expression('{:>}', '^ *(.+?)$')
def test_center(self):
'skip some surrounding whitespace'
self._test_expression('{:^}', '^ *(.+?) *$')
def test_format(self):
def _(fmt, matches):
d = extract_format(fmt)
for k in matches:
self.assertEqual(d.get(k), matches[k],
'm["%s"]=%r, expect %r' % (k, d.get(k), matches[k]))
for t in '%obxegfdDwWsS':
_(t, dict(type=t))
_('10'+t, dict(type=t, width='10'))
_('05d', dict(type='d', width='5', zero=True))
_('<', dict(align='<'))
_('.<', dict(align='<', fill='.'))
_('>', dict(align='>'))
_('.>', dict(align='>', fill='.'))
_('^', dict(align='^'))
_('.^', dict(align='^', fill='.'))
_('x=d', dict(type='d', align='=', fill='x'))
_('d', dict(type='d'))
_('ti', dict(type='ti'))
_('.^010d', dict(type='d', width='10', align='^', fill='.',
zero=True))
class TestParse(unittest.TestCase):
def test_no_match(self):
'string does not match format'
self.assertEqual(parse('{{hello}}', 'hello'), None)
def test_nothing(self):
'do no actual parsing'
r = parse('{{hello}}', '{hello}')
self.assertEqual(r.fixed, ())
self.assertEqual(r.named, {})
def test_regular_expression(self):
'match an actual regular expression'
s = r'^(hello\s[wW]{}!+.*)$'
e = s.replace('{}', 'orld')
r = parse(s, e)
self.assertEqual(r.fixed, ('orld',))
e = s.replace('{}', '.*?')
r = parse(s, e)
self.assertEqual(r.fixed, ('.*?',))
def test_fixed(self):
'pull a fixed value out of string'
r = parse('hello {}', 'hello world')
self.assertEqual(r.fixed, ('world', ))
def test_left(self):
'pull left-aligned text out of string'
r = parse('{:<} world', 'hello world')
self.assertEqual(r.fixed, ('hello', ))
def test_right(self):
'pull right-aligned text out of string'
r = parse('hello {:>}', 'hello world')
self.assertEqual(r.fixed, ('world', ))
def test_center(self):
'pull center-aligned text out of string'
r = parse('hello {:^} world', 'hello there world')
self.assertEqual(r.fixed, ('there', ))
def test_typed(self):
'pull a named, typed values out of string'
r = parse('hello {:d} {:w}', 'hello 12 people')
self.assertEqual(r.fixed, (12, 'people'))
r = parse('hello {:w} {:w}', 'hello 12 people')
self.assertEqual(r.fixed, ('12', 'people'))
def test_typed_fail(self):
'pull a named, typed values out of string'
self.assertEqual(parse('hello {:d} {:w}', 'hello people 12'), None)
def test_named(self):
'pull a named value out of string'
r = parse('hello {name}', 'hello world')
self.assertEqual(r.named, {'name': 'world'})
def test_mixed(self):
'pull a fixed and named values out of string'
r = parse('hello {} {name} {} {spam}', 'hello world and other beings')
self.assertEqual(r.fixed, ('world', 'other'))
self.assertEqual(r.named, dict(name='and', spam='beings'))
def test_named_typed(self):
'pull a named, typed values out of string'
r = parse('hello {number:d} {things}', 'hello 12 people')
self.assertEqual(r.named, dict(number=12, things='people'))
r = parse('hello {number:w} {things}', 'hello 12 people')
self.assertEqual(r.named, dict(number='12', things='people'))
def test_named_aligned_typed(self):
'pull a named, typed values out of string'
r = parse('hello {number:<d} {things}', 'hello 12 people')
self.assertEqual(r.named, dict(number=12, things='people'))
r = parse('hello {number:>d} {things}', 'hello 12 people')
self.assertEqual(r.named, dict(number=12, things='people'))
r = parse('hello {number:^d} {things}', 'hello 12 people')
self.assertEqual(r.named, dict(number=12, things='people'))
def test_multiline(self):
r = parse('hello\n{}\nworld', 'hello\nthere\nworld')
self.assertEqual(r.fixed[0], 'there')
def test_spans(self):
'test the string sections our fields come from'
string = 'hello world'
r = parse('hello {}', string)
self.assertEqual(r.spans, {0: (6,11)})
start, end = r.spans[0]
self.assertEqual(string[start:end], r.fixed[0])
string = 'hello world'
r = parse('hello {:>}', string)
self.assertEqual(r.spans, {0: (10,15)})
start, end = r.spans[0]
self.assertEqual(string[start:end], r.fixed[0])
string = 'hello 0x12 world'
r = parse('hello {val:x} world', string)
self.assertEqual(r.spans, {'val': (6,10)})
start, end = r.spans['val']
self.assertEqual(string[start:end], '0x%x' % r.named['val'])
string = 'hello world and other beings'
r = parse('hello {} {name} {} {spam}', string)
self.assertEqual(r.spans, {0: (6, 11), 'name': (12, 15),
1: (16, 21), 'spam': (22, 28)})
def test_numbers(self):
'pull a numbers out of a string'
def y(fmt, s, e, str_equals=False):
p = compile(fmt)
r = p.parse(s)
if r is None:
self.fail('%r (%r) did not match %r' % (fmt, p._expression, s))
r = r.fixed[0]
if str_equals:
self.assertEqual(str(r), str(e),
'%r found %r in %r, not %r' % (fmt, r, s, e))
else:
self.assertEqual(r, e,
'%r found %r in %r, not %r' % (fmt, r, s, e))
def n(fmt, s, e):
if parse(fmt, s) is not None:
self.fail('%r matched %r' % (fmt, s))
y('a {:d} b', 'a 12 b', 12)
y('a {:5d} b', 'a 12 b', 12)
y('a {:5d} b', 'a -12 b', -12)
y('a {:d} b', 'a -12 b', -12)
y('a {:d} b', 'a +12 b', 12)
y('a {:d} b', 'a 12 b', 12)
y('a {:d} b', 'a 0b1000 b', 8)
y('a {:d} b', 'a 0o1000 b', 512)
y('a {:d} b', 'a 0x1000 b', 4096)
y('a {:d} b', 'a 0xabcdef b', 0xabcdef)
y('a {:%} b', 'a 100% b', 1)
y('a {:%} b', 'a 50% b', .5)
y('a {:%} b', 'a 50.1% b', .501)
y('a {:n} b', 'a 100 b', 100)
y('a {:n} b', 'a 1,000 b', 1000)
y('a {:n} b', 'a 1.000 b', 1000)
y('a {:n} b', 'a -1,000 b', -1000)
y('a {:n} b', 'a 10,000 b', 10000)
y('a {:n} b', 'a 100,000 b', 100000)
n('a {:n} b', 'a 100,00 b', None)
y('a {:n} b', 'a 100.000 b', 100000)
y('a {:n} b', 'a 1.000.000 b', 1000000)
y('a {:f} b', 'a 12.0 b', 12.0)
y('a {:f} b', 'a -12.1 b', -12.1)
y('a {:f} b', 'a +12.1 b', 12.1)
n('a {:f} b', 'a 12 b', None)
y('a {:e} b', 'a 1.0e10 b', 1.0e10)
y('a {:e} b', 'a 1.0E10 b', 1.0e10)
y('a {:e} b', 'a 1.10000e10 b', 1.1e10)
y('a {:e} b', 'a 1.0e-10 b', 1.0e-10)
y('a {:e} b', 'a 1.0e+10 b', 1.0e10)
# can't actually test this one on values 'cos nan != nan
y('a {:e} b', 'a nan b', float('nan'), str_equals=True)
y('a {:e} b', 'a NAN b', float('nan'), str_equals=True)
y('a {:e} b', 'a inf b', float('inf'))
y('a {:e} b', 'a +inf b', float('inf'))
y('a {:e} b', 'a -inf b', float('-inf'))
y('a {:e} b', 'a INF b', float('inf'))
y('a {:e} b', 'a +INF b', float('inf'))
y('a {:e} b', 'a -INF b', float('-inf'))
y('a {:g} b', 'a 1 b', 1)
y('a {:g} b', 'a 1e10 b', 1e10)
y('a {:g} b', 'a 1.0e10 b', 1.0e10)
y('a {:g} b', 'a 1.0E10 b', 1.0e10)
y('a {:b} b', 'a 1000 b', 8)
y('a {:b} b', 'a 0b1000 b', 8)
y('a {:o} b', 'a 12345670 b', int('12345670', 8))
y('a {:o} b', 'a 0o12345670 b', int('12345670', 8))
y('a {:x} b', 'a 1234567890abcdef b', 0x1234567890abcdef)
y('a {:x} b', 'a 1234567890ABCDEF b', 0x1234567890ABCDEF)
y('a {:x} b', 'a 0x1234567890abcdef b', 0x1234567890abcdef)
y('a {:x} b', 'a 0x1234567890ABCDEF b', 0x1234567890ABCDEF)
y('a {:05d} b', 'a 00001 b', 1)
y('a {:05d} b', 'a -00001 b', -1)
y('a {:05d} b', 'a +00001 b', 1)
y('a {:=d} b', 'a 000012 b', 12)
y('a {:x=5d} b', 'a xxx12 b', 12)
y('a {:x=5d} b', 'a -xxx12 b', -12)
def test_datetimes(self):
def y(fmt, s, e, tz=None):
p = compile(fmt)
r = p.parse(s)
if r is None:
self.fail('%r (%r) did not match %r' % (fmt, p._expression, s))
r = r.fixed[0]
self.assertEqual(r, e,
'%r found %r in %r, not %r' % (fmt, r, s, e))
if tz is not None:
self.assertEqual(r.tzinfo, tz,
'%r found TZ %r in %r, not %r' % (fmt, r.tzinfo, s, e))
def n(fmt, s, e):
if parse(fmt, s) is not None:
self.fail('%r matched %r' % (fmt, s))
utc = FixedTzOffset(0, 'UTC')
aest = FixedTzOffset(10*60, '+1000')
# ISO 8660 variants
# YYYY-MM-DD (eg 1997-07-16)
y('a {:ti} b', 'a 1997-07-16 b', datetime(1997, 7, 16))
# YYYY-MM-DDThh:mmTZD (eg 1997-07-16T19:20+01:00)
y('a {:ti} b', 'a 1997-07-16T19:20 b', datetime(1997, 7, 16, 19, 20, 0))
y('a {:ti} b', 'a 1997-07-16T19:20Z b',
datetime(1997, 7, 16, 19, 20, tzinfo=utc))
y('a {:ti} b', 'a 1997-07-16T19:20+01:00 b',
datetime(1997, 7, 16, 19, 20, tzinfo=FixedTzOffset(60, '+01:00')))
# YYYY-MM-DDThh:mm:ssTZD (eg 1997-07-16T19:20:30+01:00)
y('a {:ti} b', 'a 1997-07-16T19:20:30 b', datetime(1997, 7, 16, 19, 20, 30))
y('a {:ti} b', 'a 1997-07-16T19:20:30Z b',
datetime(1997, 7, 16, 19, 20, 30, tzinfo=utc))
y('a {:ti} b', 'a 1997-07-16T19:20:30+01:00 b',
datetime(1997, 7, 16, 19, 20, 30, tzinfo= FixedTzOffset(60, '+01:00')))
# YYYY-MM-DDThh:mm:ss.sTZD (eg 1997-07-16T19:20:30.45+01:00)
y('a {:ti} b', 'a 1997-07-16T19:20:30.500000 b', datetime(1997, 7, 16, 19, 20, 30, 500000))
y('a {:ti} b', 'a 1997-07-16T19:20:30.5Z b',
datetime(1997, 7, 16, 19, 20, 30, 500000, tzinfo=utc))
y('a {:ti} b', 'a 1997-07-16T19:20:30.5+01:00 b',
datetime(1997, 7, 16, 19, 20, 30, 500000, tzinfo=FixedTzOffset(60, '+01:00')))
aest_d = datetime(2011, 11, 21, 10, 21, 36, tzinfo=aest)
dt = datetime(2011, 11, 21, 10, 21, 36)
dt00 = datetime(2011, 11, 21, 10, 21)
d = datetime(2011, 11, 21)
# te RFC2822 e-mail format datetime
y('a {:te} b', 'a Mon, 21 Nov 2011 10:21:36 +1000 b', aest_d)
y('a {:te} b', 'a 21 Nov 2011 10:21:36 +1000 b', aest_d)
# tg global (day/month) format datetime
y('a {:tg} b', 'a 21/11/2011 10:21:36 AM +1000 b', aest_d)
y('a {:tg} b', 'a 21-11-2011 10:21:36 AM +1000 b', aest_d)
y('a {:tg} b', 'a 21/11/2011 10:21:36 +1000 b', aest_d)
y('a {:tg} b', 'a 21/11/2011 10:21:36 b', dt)
y('a {:tg} b', 'a 21/11/2011 10:21 b', dt00)
y('a {:tg} b', 'a 21-11-2011 b', d)
y('a {:tg} b', 'a 21-Nov-2011 10:21:36 AM +1000 b', aest_d)
y('a {:tg} b', 'a 21-November-2011 10:21:36 AM +1000 b', aest_d)
# ta US (month/day) format datetime
y('a {:ta} b', 'a 11/21/2011 10:21:36 AM +1000 b', aest_d)
y('a {:ta} b', 'a 11-21-2011 10:21:36 AM +1000 b', aest_d)
y('a {:ta} b', 'a 11/21/2011 10:21:36 +1000 b', aest_d)
y('a {:ta} b', 'a 11/21/2011 10:21:36 b', dt)
y('a {:ta} b', 'a 11/21/2011 10:21 b', dt00)
y('a {:ta} b', 'a 11-21-2011 b', d)
y('a {:ta} b', 'a Nov-21-2011 10:21:36 AM +1000 b', aest_d)
y('a {:ta} b', 'a November-21-2011 10:21:36 AM +1000 b', aest_d)
y('a {:ta} b', 'a November-21-2011 b', d)
# th HTTP log format date/time datetime
y('a {:th} b', 'a 21/Nov/2011:10:21:36 +1000 b', aest_d)
d = datetime(2011, 11, 21, 10, 21, 36)
# tc ctime() format datetime
y('a {:tc} b', 'a Mon Nov 21 10:21:36 2011 b', d)
t530 = FixedTzOffset(-5*60 - 30, '-5:30')
# tt Time time
y('a {:tt} b', 'a 10:21:36 AM +1000 b', time(10, 21, 36, tzinfo=aest))
y('a {:tt} b', 'a 10:21:36 AM b', time(10, 21, 36))
y('a {:tt} b', 'a 10:21:36 PM b', time(22, 21, 36))
y('a {:tt} b', 'a 10:21:36 b', time(10, 21, 36))
y('a {:tt} b', 'a 10:21 b', time(10, 21))
y('a {:tt} b', 'a 10:21:36 PM -5:30 b', time(22, 21, 36, tzinfo=t530))
def test_datetime_group_count(self):
'test we increment the group count correctly for datetimes'
r = parse('{:ti} {}', '1972-01-01 spam')
self.assertEqual(r.fixed[1], 'spam')
r = parse('{:tg} {}', '1-1-1972 spam')
self.assertEqual(r.fixed[1], 'spam')
r = parse('{:ta} {}', '1-1-1972 spam')
self.assertEqual(r.fixed[1], 'spam')
r = parse('{:th} {}', '21/Nov/2011:10:21:36 +1000 spam')
self.assertEqual(r.fixed[1], 'spam')
r = parse('{:te} {}', '21 Nov 2011 10:21:36 +1000 spam')
self.assertEqual(r.fixed[1], 'spam')
r = parse('{:tc} {}', 'Mon Nov 21 10:21:36 2011 spam')
self.assertEqual(r.fixed[1], 'spam')
r = parse('{:tt} {}', '10:21 spam')
self.assertEqual(r.fixed[1], 'spam')
def test_mixed_types(self):
'stress-test: pull one of everything out of a string'
r = parse('''
letters: {:w}
non-letters: {:W}
whitespace: "{:s}"
non-whitespace: \t{:S}\n
digits: {:d} {:d} {:d}
non-digits: {:D}
numbers with thousands: {:n} {:n}
fixed-point: {:f} {:f}
floating-point: {:e} {:e}
general numbers: {:g} {:g} {:g} {:g}
binary: {:b} {:b}
octal: {:o} {:o}
hex: {:x} {:x}
ISO 8601 e.g. {:ti}
RFC2822 e.g. {:te}
Global e.g. {:tg}
US e.g. {:ta}
ctime() e.g. {:tc}
HTTP e.g. {:th}
time: {:tt}
final value: {}
''',
'''
letters: abcdef_GHIJLK
non-letters: !@#%$ *^%
whitespace: " \t\n"
non-whitespace: \tabc\n
digits: 12345 0b1011011 0xabcdef
non-digits: abcdef
numbers with thousands: 1,000 1.000.000
fixed-point: 100.2345 0.00001
floating-point: 1.1e-10 NAN
general numbers: 1 1.1 1.1e10 nan
binary: 0b1000 0B1000
octal: 0o1000 0O1000
hex: 0x1000 0X1000
ISO 8601 e.g. 1972-01-20T10:21:36Z
RFC2822 e.g. Mon, 20 Jan 1972 10:21:36 +1000
Global e.g. 20/1/1972 10:21:36 AM +1:00
US e.g. 1/20/1972 10:21:36 PM +10:30
ctime() e.g. Sun Sep 16 01:03:52 1973
HTTP e.g. 21/Nov/2011:00:07:11 +0000
time: 10:21:36 PM -5:30
final value: spam
''')
self.assertEqual(r.fixed[31], 'spam')
def test_too_many_fields(self):
self.assertRaises(TooManyFields, compile, '{:ti}' * 15)
if __name__ == '__main__':
unittest.main()
# Copyright (c) 2011 eKit.com Inc (http://www.ekit.com/)
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
# vim: set filetype=python ts=4 sw=4 et si tw=75
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