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117 lines
3.2 KiB
117 lines
3.2 KiB
#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import re
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from .. import DatumInContext, This
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SUB = re.compile(r"sub\(/(.*)/,\s+(.*)\)")
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SPLIT = re.compile(r"split\((.),\s+(\d+),\s+(\d+|-1)\)")
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STR = re.compile(r"str\(\)")
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class DefintionInvalid(Exception):
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pass
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class Sub(This):
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"""Regex substituor
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Concrete syntax is '`sub(/regex/, repl)`'
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"""
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def __init__(self, method=None):
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m = SUB.match(method)
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if m is None:
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raise DefintionInvalid("%s is not valid" % method)
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self.expr = m.group(1).strip()
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self.repl = m.group(2).strip()
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self.regex = re.compile(self.expr)
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self.method = method
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def find(self, datum):
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datum = DatumInContext.wrap(datum)
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value = self.regex.sub(self.repl, datum.value)
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if value == datum.value:
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return []
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else:
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return [DatumInContext.wrap(value)]
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def __eq__(self, other):
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return (isinstance(other, Sub) and self.method == other.method)
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def __repr__(self):
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return '%s(%r)' % (self.__class__.__name__, self.method)
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def __str__(self):
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return '`sub(/%s/, %s)`' % (self.expr, self.repl)
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class Split(This):
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"""String splitter
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Concrete syntax is '`split(char, segment, max_split)`'
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"""
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def __init__(self, method=None):
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m = SPLIT.match(method)
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if m is None:
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raise DefintionInvalid("%s is not valid" % method)
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self.char = m.group(1)
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self.segment = int(m.group(2))
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self.max_split = int(m.group(3))
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self.method = method
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def find(self, datum):
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datum = DatumInContext.wrap(datum)
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try:
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value = datum.value.split(self.char, self.max_split)[self.segment]
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except Exception:
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return []
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return [DatumInContext.wrap(value)]
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def __eq__(self, other):
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return (isinstance(other, Split) and self.method == other.method)
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def __repr__(self):
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return '%s(%r)' % (self.__class__.__name__, self.method)
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def __str__(self):
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return '`%s`' % self.method
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class Str(This):
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"""String converter
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Concrete syntax is '`str()`'
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"""
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def __init__(self, method=None):
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m = STR.match(method)
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if m is None:
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raise DefintionInvalid("%s is not valid" % method)
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self.method = method
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def find(self, datum):
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datum = DatumInContext.wrap(datum)
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value = str(datum.value)
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return [DatumInContext.wrap(value)]
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def __eq__(self, other):
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return (isinstance(other, Str) and self.method == other.method)
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def __repr__(self):
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return '%s(%r)' % (self.__class__.__name__, self.method)
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def __str__(self):
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return '`str()`'
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