import io
import json
import logging
-import itertools
-import re
-
-from icu import Transliterator
from nominatim.config import flatten_config_list
from nominatim.db.properties import set_property, get_property
from nominatim.errors import UsageError
from nominatim.tokenizer.place_sanitizer import PlaceSanitizer
-import nominatim.tokenizer.icu_variants as variants
LOG = logging.getLogger()
return rules[section]
-class VariantRule:
- """ Saves a single variant expansion.
-
- An expansion consists of the normalized replacement term and
- a dicitonary of properties that describe when the expansion applies.
- """
-
- def __init__(self, replacement, properties):
- self.replacement = replacement
- self.properties = properties or {}
-
-
class ICURuleLoader:
""" Compiler for ICU rules from a tokenizer configuration file.
"""
self._mod_create = analysis_mod.create
# Load the configuration.
- self.config = {}
- self._parse_variant_list(rules.get('variants'), normalization_rules)
+ self.config = analysis_mod.configure(rules, normalization_rules)
def create(self, normalization_rules, transliteration_rules):
return self._mod_create(normalization_rules,
transliteration_rules,
self.config)
-
-
- def _parse_variant_list(self, rules, normalization_rules):
- vset = set()
-
- if not rules:
- return
-
- rules = flatten_config_list(rules, 'variants')
-
- vmaker = _VariantMaker(normalization_rules)
-
- properties = []
- for section in rules:
- # Create the property field and deduplicate against existing
- # instances.
- props = variants.ICUVariantProperties.from_rules(section)
- for existing in properties:
- if existing == props:
- props = existing
- break
- else:
- properties.append(props)
-
- for rule in (section.get('words') or []):
- vset.update(vmaker.compute(rule, props))
-
- self.config['variants'] = vset
-
-
-class _VariantMaker:
- """ Generater for all necessary ICUVariants from a single variant rule.
-
- All text in rules is normalized to make sure the variants match later.
- """
-
- def __init__(self, norm_rules):
- self.norm = Transliterator.createFromRules("rule_loader_normalization",
- norm_rules)
-
-
- def compute(self, rule, props):
- """ Generator for all ICUVariant tuples from a single variant rule.
- """
- parts = re.split(r'(\|)?([=-])>', rule)
- if len(parts) != 4:
- raise UsageError("Syntax error in variant rule: " + rule)
-
- decompose = parts[1] is None
- src_terms = [self._parse_variant_word(t) for t in parts[0].split(',')]
- repl_terms = (self.norm.transliterate(t.strip()) for t in parts[3].split(','))
-
- # If the source should be kept, add a 1:1 replacement
- if parts[2] == '-':
- for src in src_terms:
- if src:
- for froms, tos in _create_variants(*src, src[0], decompose):
- yield variants.ICUVariant(froms, tos, props)
-
- for src, repl in itertools.product(src_terms, repl_terms):
- if src and repl:
- for froms, tos in _create_variants(*src, repl, decompose):
- yield variants.ICUVariant(froms, tos, props)
-
-
- def _parse_variant_word(self, name):
- name = name.strip()
- match = re.fullmatch(r'([~^]?)([^~$^]*)([~$]?)', name)
- if match is None or (match.group(1) == '~' and match.group(3) == '~'):
- raise UsageError("Invalid variant word descriptor '{}'".format(name))
- norm_name = self.norm.transliterate(match.group(2))
- if not norm_name:
- return None
-
- return norm_name, match.group(1), match.group(3)
-
-
-_FLAG_MATCH = {'^': '^ ',
- '$': ' ^',
- '': ' '}
-
-
-def _create_variants(src, preflag, postflag, repl, decompose):
- if preflag == '~':
- postfix = _FLAG_MATCH[postflag]
- # suffix decomposition
- src = src + postfix
- repl = repl + postfix
-
- yield src, repl
- yield ' ' + src, ' ' + repl
-
- if decompose:
- yield src, ' ' + repl
- yield ' ' + src, repl
- elif postflag == '~':
- # prefix decomposition
- prefix = _FLAG_MATCH[preflag]
- src = prefix + src
- repl = prefix + repl
-
- yield src, repl
- yield src + ' ', repl + ' '
-
- if decompose:
- yield src, repl + ' '
- yield src + ' ', repl
- else:
- prefix = _FLAG_MATCH[preflag]
- postfix = _FLAG_MATCH[postflag]
-
- yield prefix + src + postfix, prefix + repl + postfix
"""
from collections import defaultdict
import itertools
+import re
from icu import Transliterator
import datrie
+from nominatim.config import flatten_config_list
+from nominatim.errors import UsageError
+import nominatim.tokenizer.icu_variants as variants
+
+### Configuration section
+
+def configure(rules, normalization_rules):
+ """ Extract and preprocess the configuration for this module.
+ """
+ return {'variants': _parse_variant_list(rules.get('variants'),
+ normalization_rules)}
+
+
+def _parse_variant_list(rules, normalization_rules):
+ vset = set()
+
+ if rules:
+ rules = flatten_config_list(rules, 'variants')
+
+ vmaker = _VariantMaker(normalization_rules)
+
+ properties = []
+ for section in rules:
+ # Create the property field and deduplicate against existing
+ # instances.
+ props = variants.ICUVariantProperties.from_rules(section)
+ for existing in properties:
+ if existing == props:
+ props = existing
+ break
+ else:
+ properties.append(props)
+
+ for rule in (section.get('words') or []):
+ vset.update(vmaker.compute(rule, props))
+
+ return vset
+
+
+class _VariantMaker:
+ """ Generater for all necessary ICUVariants from a single variant rule.
+
+ All text in rules is normalized to make sure the variants match later.
+ """
+
+ def __init__(self, norm_rules):
+ self.norm = Transliterator.createFromRules("rule_loader_normalization",
+ norm_rules)
+
+
+ def compute(self, rule, props):
+ """ Generator for all ICUVariant tuples from a single variant rule.
+ """
+ parts = re.split(r'(\|)?([=-])>', rule)
+ if len(parts) != 4:
+ raise UsageError("Syntax error in variant rule: " + rule)
+
+ decompose = parts[1] is None
+ src_terms = [self._parse_variant_word(t) for t in parts[0].split(',')]
+ repl_terms = (self.norm.transliterate(t.strip()) for t in parts[3].split(','))
+
+ # If the source should be kept, add a 1:1 replacement
+ if parts[2] == '-':
+ for src in src_terms:
+ if src:
+ for froms, tos in _create_variants(*src, src[0], decompose):
+ yield variants.ICUVariant(froms, tos, props)
+
+ for src, repl in itertools.product(src_terms, repl_terms):
+ if src and repl:
+ for froms, tos in _create_variants(*src, repl, decompose):
+ yield variants.ICUVariant(froms, tos, props)
+
+
+ def _parse_variant_word(self, name):
+ name = name.strip()
+ match = re.fullmatch(r'([~^]?)([^~$^]*)([~$]?)', name)
+ if match is None or (match.group(1) == '~' and match.group(3) == '~'):
+ raise UsageError("Invalid variant word descriptor '{}'".format(name))
+ norm_name = self.norm.transliterate(match.group(2))
+ if not norm_name:
+ return None
+
+ return norm_name, match.group(1), match.group(3)
+
+
+_FLAG_MATCH = {'^': '^ ',
+ '$': ' ^',
+ '': ' '}
+
+
+def _create_variants(src, preflag, postflag, repl, decompose):
+ if preflag == '~':
+ postfix = _FLAG_MATCH[postflag]
+ # suffix decomposition
+ src = src + postfix
+ repl = repl + postfix
+
+ yield src, repl
+ yield ' ' + src, ' ' + repl
+
+ if decompose:
+ yield src, ' ' + repl
+ yield ' ' + src, repl
+ elif postflag == '~':
+ # prefix decomposition
+ prefix = _FLAG_MATCH[preflag]
+ src = prefix + src
+ repl = prefix + repl
+
+ yield src, repl
+ yield src + ' ', repl + ' '
+
+ if decompose:
+ yield src, repl + ' '
+ yield src + ' ', repl
+ else:
+ prefix = _FLAG_MATCH[preflag]
+ postfix = _FLAG_MATCH[postflag]
+
+ yield prefix + src + postfix, prefix + repl + postfix
+
+
### Analysis section
def create(norm_rules, trans_rules, config):
projects / nominatim.git / commitdiff