text: """
  
  Module for all things related to lookup tables
  
  """
  
  import csv
  import os
  import re
  import json
  from typing import DefaultDict, List, Pattern, Union
  from collections import defaultdict, OrderedDict
  from itertools import chain
  from pathlib import Path
  from operator import methodcaller
  from copy import deepcopy
  
  import yaml
  
  from g2p import exceptions
  from g2p.mappings.langs import __file__ as LANGS_FILE, LANGS, MAPPINGS_AVAILABLE
  from g2p.mappings.utils import create_fixed_width_lookbehind, escape_special_characters, normalize
  from g2p.mappings.utils import flatten_abbreviations, IndentDumper, load_abbreviations_from_file
  from g2p.mappings.utils import load_from_file, load_mapping_from_path, unicode_escape, validate
  from g2p.log import LOGGER
  
  
  class Mapping():
      """ Class for lookup tables
  
          @param as_is: bool = False
              Evaluate g2p rules in mapping in the order they are.
              Default is to reverse sort them by length.
  
          @param case_sensitive: bool = True
              Lower all rules and conversion input
  
          @param escape_special: bool = False
              Escape special characters in rules
  
          @param norm_form: str = "NFC"
              Normalization standard to follow. NFC | NKFC | NFD | NKFD
  
          @param reverse: bool = False
              Reverse all mappings
  
      """
  
      def __init__(self, mapping=None, abbreviations: Union[str, DefaultDict[str, List[str]]] = False, **kwargs):
          # should these just be explicit instead of kwargs...
          self.allowable_kwargs = ['language_name', 'display_name', 'mapping', 'in_lang',
                                   'out_lang', 'out_delimiter', 'as_is', 'case_sensitive', 'escape_special', 'norm_form', 'reverse']
          self.kwargs = OrderedDict(kwargs)
          self.processed = False
          if isinstance(abbreviations, defaultdict) or not abbreviations:
              self.abbreviations = abbreviations
          elif abbreviations:
              self.abbreviations = load_abbreviations_from_file(
                  abbreviations)
          # Handle user-supplied list
          if isinstance(mapping, list):
              self.mapping = validate(mapping)
          elif isinstance(mapping, str):
              loaded_config = load_mapping_from_path(mapping)
              self.process_loaded_config(loaded_config)
          else:
              if "in_lang" in self.kwargs and "out_lang" in self.kwargs:
                  loaded_config = self.find_mapping(
                      self.kwargs['in_lang'], self.kwargs['out_lang'])
                  self.process_loaded_config(loaded_config)
              elif 'id' in self.kwargs:
                  loaded_config = self.find_mapping_by_id(self.kwargs['id'])
                  self.process_loaded_config(loaded_config)
              else:
                  raise exceptions.MalformedLookup()
          if self.abbreviations:
              for abb, stands_for in self.abbreviations.items():
                  abb_match = re.compile(abb)
                  abb_repl = '|'.join(stands_for)
                  if self.mapping and 'match_pattern' not in self.mapping[0]:
                      for io in self.mapping:
                          for key in io.keys():
                              if key in ['in', 'out', 'context_before', 'context_after'] and re.search(abb_match, io[key]):
                                  io[key] = re.sub(
                                      abb_match, unicode_escape(abb_repl), io[key])
          if not self.processed:
              self.mapping = self.process_kwargs(self.mapping)
  
      def __len__(self):
          return len(self.mapping)
  
      def __call__(self):
          return self.mapping
  
      def __iter__(self):
          return iter(self.mapping)
  
      def inventory(self, in_or_out: str = 'in'):
          ''' Return just inputs or outputs as inventory of mapping
          '''
          return [x[in_or_out] for x in self.mapping]
  
      def process_loaded_config(self, config):
          ''' For a mapping loaded from a file, take the keyword arguments and supply them to the
              Mapping, and get any abbreviations data.
          '''
          self.mapping = config['mapping_data']
          mapping_kwargs = OrderedDict(
              {k: v for k, v in config.items() if k in self.allowable_kwargs})
          self.abbreviations = config.get('abbreviations_data', None)
          # Merge kwargs, but prioritize kwargs that initialized the Mapping
          self.kwargs = {**mapping_kwargs, **self.kwargs}
  
      def plain_mapping(self):
          ''' Return mapping
          '''
          return [{k: v for k, v in io.items() if k in ['in', 'out', 'context_before', 'context_after']} for io in self.mapping]
  
      def process_kwargs(self, mapping):
          ''' Apply kwargs in the order they are provided. kwargs are ordered as of python 3.6
          '''
          # Add defaults
          if 'as_is' not in self.kwargs:
              self.kwargs['as_is'] = False
          if 'case_sensitive' not in self.kwargs:
              self.kwargs['case_sensitive'] = True
          if 'escape_special' not in self.kwargs:
              self.kwargs['escape_special'] = False
          if 'norm_form' not in self.kwargs:
              self.kwargs['norm_form'] = 'NFC'
          if 'reverse' not in self.kwargs:
              self.kwargs['reverse'] = False
          # Process kwargs in order received
          for kwarg, val in self.kwargs.items():
              if kwarg == 'as_is' and not val:
                  # sort by reverse len
                  mapping = sorted(mapping, key=lambda x: len(
                      x["in"]), reverse=True)
              elif kwarg == 'escape_special' and val:
                  mapping = [escape_special_characters(x) for x in mapping]
              elif kwarg == 'case_sensitive' and not val:
                  mapping = self.lower_mappings(mapping)
              elif kwarg == 'norm_form' and val:
                  for io in mapping:
                      for k, v in io.items():
                          if isinstance(v, str):
                              io[k] = normalize(v, self.kwargs['norm_form'])
              elif kwarg == 'reverse' and val:
                  mapping = self.reverse_mappings(mapping)
          # After all processing is done, turn into regex
          for io in mapping:
              io['match_pattern'] = self.rule_to_regex(io)
          self.processed = True
          return mapping
  
      def rule_to_regex(self, rule: str) -> Pattern:
          """Turns an input string (and the context) from an input/output pair
          into a regular expression pattern"""
          if "context_before" in rule and rule['context_before']:
              before = rule["context_before"]
          else:
              before = ''
          if 'context_after' in rule and rule['context_after']:
              after = rule["context_after"]
          else:
              after = ''
          input_match = re.sub(re.compile(
              r'{\d+}'), "", rule['in'])
          try:
              inp = create_fixed_width_lookbehind(before) + input_match
              if after:
                  inp += f"(?={after})"
              if not self.kwargs['case_sensitive']:
                  rule_regex = re.compile(inp, re.I)
              else:
                  rule_regex = re.compile(inp)
          except:
              LOGGER.error(f'Your regex in mapping between {self.kwargs["in_lang"]} and {self.kwargs["out_lang"]} is malformed. \
                      Do you have un-escaped regex characters in your input {inp}, contexts {before}, {after}?')
              raise Exception(
                  f'Your regex in mapping between {self.kwargs["in_lang"]} and {self.kwargs["out_lang"]} is malformed. \
                      Do you have un-escaped regex characters in your input {inp}, contexts {before}, {after}?')
          return rule_regex
  
      def reverse_mappings(self, mapping):
          ''' Reverse the mapping
          '''
          for io in mapping:
              io['in'], io['out'] = io['out'], io['in']
          return mapping
  
      def lower_mappings(self, mapping):
          ''' Lower the mapping
          '''
          for io in mapping:
              for k, v in io.items():
                  if k in ['in', 'out', 'context_before', 'context_after']:
                      io[k] = v.lower()
          return mapping
  
      def add_abbreviations(self, abbs, mappings):
          ''' Return abbreviated forms, given a list of abbreviations.
  
          {'in': 'a', 'out': 'b', 'context_before': 'V', 'context_after': '' }
          {'abbreviation': 'V', 'stands_for': ['a','b','c']}
          ->
          {'in': 'a', 'out': 'b', 'context_before': 'a|b|c', 'context_after': ''}
          '''
          for abb in abbs:
              for io in mappings:
                  for key in io.keys():
                      if io[key] == abb['abbreviation']:
                          io[key] = abb['stands_for']
          return mappings
  
      def find_mapping(self, in_lang: str, out_lang: str) -> list:
          ''' Given an input and output, find a mapping to get between them.
          '''
          for mapping in MAPPINGS_AVAILABLE:
              map_in_lang = mapping.get('in_lang', '')
              map_out_lang = mapping.get('out_lang', '')
              if map_in_lang == in_lang and map_out_lang == out_lang:
                  return deepcopy(mapping)
          raise exceptions.MappingMissing(in_lang, out_lang)
  
      def find_mapping_by_id(self, map_id: str):
          ''' Find the mapping with a given ID
          '''
          for mapping in MAPPINGS_AVAILABLE:
              if mapping.get('id', '') == map_id:
                  return deepcopy(mapping)
  
      def mapping_to_file(self, output_path: str, file_type: str):
          ''' Write mapping to file
          '''
          if not os.path.isdir(output_path):
              raise Exception("Path %s is not a directory", output_path)
          fn = os.path.join(output_path, self.kwargs.get('in_lang', 'und') + "_to_" +
                            self.kwargs.get('out_lang', 'und') + "." + file_type)
          fieldnames = ['in', 'out', 'context_before', 'context_after']
          filtered = [{k: v for k, v in io.items() if k in fieldnames}
                      for io in self.mapping]
          if file_type == 'json':
              with open(fn, 'w') as f:
                  json.dump(filtered, f, indent=4)
          elif file_type == 'csv':
              with open(fn, 'w') as f:
                  writer = csv.DictWriter(f, fieldnames=fieldnames)
                  for io in filtered:
                      writer.writerow(io)
          else:
              raise exceptions.IncorrectFileType
  
      def config_to_file(self, output_path: str, mapping_type: str):
          ''' Write config to file
          '''
          if not os.path.isdir(output_path):
              raise Exception("Path %s is not a directory", output_path)
          fn = os.path.join(output_path, 'config.yaml')
          template = {"mappings": [
              {
                  "language_name": self.kwargs.get('language_name', self.kwargs.get('in_lang', 'und')),
                  "display_name": self.kwargs.get('display_name', self.kwargs.get('in_lang', 'und') + " to " + self.kwargs.get('out_lang', 'und')),
                  "in_lang": self.kwargs.get('in_lang', 'und'),
                  "out_lang": self.kwargs.get('out_lang', 'und'),
                  "authors": self.kwargs.get('authors', ['generated']),
                  "as_is": self.kwargs.get('as_is', False),
                  "case_sensitive": self.kwargs.get('case_sensitive', True),
                  "escape_special": self.kwargs.get('escape_special', False),
                  "norm_form": self.kwargs.get('norm_form', "NFC"),
                  "reverse": self.kwargs.get('reverse', False),
                  "mapping": self.kwargs.get('in_lang', 'und') + "_to_" +
                  self.kwargs.get('out_lang', 'und') + "." + mapping_type
              }
          ]}
          with open(fn, 'w') as f:
              yaml.dump(template, f, Dumper=IndentDumper,
                        default_flow_style=False)
  
      def to_file(self, output_path: str, mapping_type: str = 'csv'):
          self.mapping_to_file(output_path, mapping_type)
          self.config_to_file(output_path, mapping_type)
  
  
  if __name__ == '__main__':
      pass
  