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padaos.py
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padaos.py
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import re
import sre_constants
import logging
from threading import Lock
LOG = logging.getLogger('padaos')
class IntentContainer:
def __init__(self):
self.intent_lines, self.entity_lines = {}, {}
self.intents, self.entities = {}, {}
self.must_compile = True
self.i = 0
self.compile_lock = Lock()
def add_intent(self, name, lines):
with self.compile_lock:
self.must_compile = True
self.intent_lines[name] = lines
def remove_intent(self, name):
with self.compile_lock:
self.must_compile = True
if name in self.intent_lines:
del self.intent_lines[name]
def add_entity(self, name, lines):
with self.compile_lock:
self.must_compile = True
self.entity_lines[name] = lines
def remove_entity(self, name):
with self.compile_lock:
self.must_compile = True
if name in self.entity_lines:
del self.entity_lines[name]
def _create_pattern(self, line):
for pat, rep in (
# === Preserve Plain Parentheses ===
(r'\(([^\|)]*)\)', r'{~(\1)~}'), # (hi) -> {~(hi)~}
# === Convert to regex literal ===
(r'(\W)', r'\\\1'),
(r' {} '.format, None), # 'abc' -> ' abc '
# === Unescape Chars for Convenience ===
(r'\\ ', r' '), # "\ " -> " "
(r'\\{', r'{'), # \{ -> {
(r'\\}', r'}'), # \} -> }
(r'\\#', r'#'), # \# -> #
# === Support Parentheses Expansion ===
(r'(?<!\\{\\~)\\\(', r'(?:'), # \( -> ( ignoring \{\~\(
(r'\\\)(?!\\~\\})', r')'), # \) -> ) ignoring \)\~\}
(r'\\{\\~\\\(', r'\\('), # \{\~\( -> \(
(r'\\\)\\~\\}', r'\\)'), # \)\~\} -> \)
(r'\\\|', r'|'), # \| -> |
# === Support Special Symbols ===
(r'(?<=\s)\\:0(?=\s)', r'\\w+'),
(r'#', r'\\d'),
(r'\d', r'\\d'),
# === Space Word Separations ===
(r'(?<!\\)(\w)([^\w\s}])', r'\1 \2'), # a:b -> a :b
(r'([^\\\w\s{])(\w)', r'\1 \2'), # a :b -> a : b
# === Make Symbols Optional ===
(r'(\\[^\w ])', r'\1?'),
# === Force 1+ Space Between Words ===
(r'(?<=(\w|\}))(\\\s|\s)+(?=\S)', r'\\W+'),
# === Force 0+ Space Between Everything Else ===
(r'\s+', r'\\W*'),
):
if callable(pat):
line = pat(line)
else:
line = re.sub(pat, rep, line)
return line
def _create_intent_pattern(self, line, intent_name):
namespace = intent_name.split(':')[0] + ':'
line = self._create_pattern(line)
replacements = {}
for ent_name in set(re.findall(r'{([a-z_:]+)}', line)):
replacements[ent_name] = r'(?P<{}__{{}}>.*?\w.*?)'.format(ent_name)
for ent_name, ent in self.entities.items():
ent_regex = r'(?P<{}__{{}}>{})'
if ent_name.startswith(namespace):
replacements[ent_name[len(namespace):]] = ent_regex.format(
ent_name[len(namespace):], ent
)
else:
replacements[ent_name] = ent_regex.format(ent_name.replace(':', '__colon__'), ent)
for key, value in replacements.items():
line = line.replace('{' + key + '}', value.format(self.i), 1)
self.i += 1
return '^{}$'.format(line)
def _create_regex(self, line, intent_name):
""" Create regex and return. If error occurs returns None. """
try:
return re.compile(self._create_intent_pattern(line, intent_name),
re.IGNORECASE)
except sre_constants.error as e:
LOG.warning('Failed to parse the line "{}" '
'for {}'.format(line, intent_name))
return None
def create_regexes(self, lines, intent_name):
regexes = [self._create_regex(line, intent_name)
for line in sorted(lines, key=len, reverse=True)
if line.strip()]
# Filter out all regexes that fails
return [r for r in regexes if r is not None]
def compile(self):
with self.compile_lock:
self._compile()
def _compile(self):
self.entities = {
ent_name: r'({})'.format('|'.join(
self._create_pattern(line) for line in lines if line.strip()
))
for ent_name, lines in self.entity_lines.items()
}
self.intents = {
intent_name: self.create_regexes(lines, intent_name)
for intent_name, lines in self.intent_lines.items()
}
self.must_compile = False
def _calc_entities(self, query, regexes):
for regex in regexes:
match = regex.match(query)
if match:
yield {
k.rsplit('__', 1)[0].replace('__colon__', ':'): v.strip()
for k, v in match.groupdict().items() if v
}
def calc_intents(self, query):
query = ' ' + query + ' '
if self.must_compile:
self.compile()
for intent_name, regexes in self.intents.items():
entities = list(self._calc_entities(query, regexes))
if entities:
yield {
'name': intent_name,
'entities': min(entities, key=lambda x: sum(map(len, x.values())))
}
def calc_intent(self, query):
return min(
self.calc_intents(query),
key=lambda x: sum(map(len, x['entities'].values())),
default={'name': None, 'entities': {}}
)