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#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import re
from .. import DatumInContext, This
SUB = re.compile(r"sub\(/(.*)/,\s+(.*)\)")
# Regex generated using the EZRegex package (ezregex.org)
# EZRegex code:
# param1 = group(optional(either("'", '"')), name='quote') + group(chunk) + earlier_group('quote')
# param2 = group(either(optional('-') + number, '*'))
# param3 = group(optional('-') + number)
# pattern = 'split' + ow + '(' + ow + param1 + ow + ',' + ow + param2 + ow + ',' + ow + param3 + ow + ')'
SPLIT = re.compile(r"split(?:\s+)?\((?:\s+)?(?P<quote>(?:(?:'|\"))?)(.+)(?P=quote)(?:\s+)?,(?:\s+)?((?:(?:\-)?\d+|\*))(?:\s+)?,(?:\s+)?((?:\-)?\d+)(?:\s+)?\)")
STR = re.compile(r"str\(\)")
class DefintionInvalid(Exception):
pass
class Sub(This):
"""Regex substituor
Concrete syntax is '`sub(/regex/, repl)`'
"""
def __init__(self, method=None):
m = SUB.match(method)
if m is None:
raise DefintionInvalid("%s is not valid" % method)
self.expr = m.group(1).strip()
self.repl = m.group(2).strip()
self.regex = re.compile(self.expr)
self.method = method
def find(self, datum):
datum = DatumInContext.wrap(datum)
value = self.regex.sub(self.repl, datum.value)
if value == datum.value:
return []
else:
return [DatumInContext.wrap(value)]
def __eq__(self, other):
return (isinstance(other, Sub) and self.method == other.method)
def __repr__(self):
return '%s(%r)' % (self.__class__.__name__, self.method)
def __str__(self):
return '`sub(/%s/, %s)`' % (self.expr, self.repl)
class Split(This):
"""String splitter
Concrete syntax is '`split(chars, segment, max_split)`'
`chars` can optionally be surrounded by quotes, to specify things like commas or spaces
`segment` can be `*` to select all
`max_split` can be negative, to indicate no limit
"""
def __init__(self, method=None):
m = SPLIT.match(method)
if m is None:
raise DefintionInvalid("%s is not valid" % method)
self.chars = m.group(2)
self.segment = m.group(3)
self.max_split = int(m.group(4))
self.method = method
def find(self, datum):
datum = DatumInContext.wrap(datum)
try:
if self.segment == '*':
value = datum.value.split(self.chars, self.max_split)
else:
value = datum.value.split(self.chars, self.max_split)[int(self.segment)]
except:
return []
return [DatumInContext.wrap(value)]
def __eq__(self, other):
return (isinstance(other, Split) and self.method == other.method)
def __repr__(self):
return '%s(%r)' % (self.__class__.__name__, self.method)
def __str__(self):
return '`%s`' % self.method
class Str(This):
"""String converter
Concrete syntax is '`str()`'
"""
def __init__(self, method=None):
m = STR.match(method)
if m is None:
raise DefintionInvalid("%s is not valid" % method)
self.method = method
def find(self, datum):
datum = DatumInContext.wrap(datum)
value = str(datum.value)
return [DatumInContext.wrap(value)]
def __eq__(self, other):
return (isinstance(other, Str) and self.method == other.method)
def __repr__(self):
return '%s(%r)' % (self.__class__.__name__, self.method)
def __str__(self):
return '`str()`'
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