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"""Segment text with SRX.
"""
__version__ = '0.0.2'
import lxml.etree
import regex
from typing import (
List,
Set,
Tuple,
Dict,
Optional
)
class SrxSegmenter:
"""Handle segmentation with SRX regex format.
"""
def __init__(self, rule: Dict[str, List[Tuple[str, Optional[str]]]], source_text: str) -> None:
self.source_text = source_text
self.non_breaks = rule.get('non_breaks', [])
self.breaks = rule.get('breaks', [])
def _get_break_points(self, regexes: List[Tuple[str, str]]) -> Set[int]:
return set([
match.span(1)[1]
for before, after in regexes
for match in regex.finditer('({})({})'.format(before, after), self.source_text)
])
def get_non_break_points(self) -> Set[int]:
"""Return segment non break points
"""
return self._get_break_points(self.non_breaks)
def get_break_points(self) -> Set[int]:
"""Return segment break points
"""
return self._get_break_points(self.breaks)
def extract(self) -> Tuple[List[str], List[str]]:
"""Return segments and whitespaces.
"""
non_break_points = self.get_non_break_points()
candidate_break_points = self.get_break_points()
break_point = sorted(candidate_break_points - non_break_points)
source_text = self.source_text
segments = [] # type: List[str]
whitespaces = [] # type: List[str]
previous_foot = ""
for start, end in zip([0] + break_point, break_point + [len(source_text)]):
segment_with_space = source_text[start:end]
candidate_segment = segment_with_space.strip()
if not candidate_segment:
previous_foot += segment_with_space
continue
head, segment, foot = segment_with_space.partition(candidate_segment)
segments.append(segment)
whitespaces.append('{}{}'.format(previous_foot, head))
previous_foot = foot
whitespaces.append(previous_foot)
return segments, whitespaces
def parse(srx_filepath: str) -> Dict[str, Dict[str, List[Tuple[str, Optional[str]]]]]:
"""Parse SRX file and return it.
:param srx_filepath: is soruce SRX file.
:return: dict
"""
tree = lxml.etree.parse(srx_filepath)
namespaces = {
'ns': 'http://www.lisa.org/srx20'
}
rules = {}
for languagerule in tree.xpath('//ns:languagerule', namespaces=namespaces):
rule_name = languagerule.attrib.get('languagerulename')
if rule_name is None:
continue
current_rule = {
'breaks': [],
'non_breaks': [],
}
for rule in languagerule.xpath('ns:rule', namespaces=namespaces):
is_break = rule.attrib.get('break', 'yes') == 'yes'
rule_holder = current_rule['breaks'] if is_break else current_rule['non_breaks']
beforebreak = rule.find('ns:beforebreak', namespaces=namespaces)
beforebreak_text = '' if beforebreak.text is None else beforebreak.text
afterbreak = rule.find('ns:afterbreak', namespaces=namespaces)
afterbreak_text = '' if afterbreak.text is None else afterbreak.text
rule_holder.append((beforebreak_text, afterbreak_text))
rules[rule_name] = current_rule
#_add_softcatala_rules(rules)
return rules
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