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import re
from typing import List
class ReferenceExtractor:
"""
BNS Reference Extractor
Detects:
section 103
Section 103
sections 103 and 104
sections 103, 104, 105
section 103 of this Sanhita
"""
# =====================================================
# SECTION REFERENCES
# =====================================================
SECTION_RE = re.compile(
r"\bsection[s]?\s+([0-9,\sand]+)",
re.IGNORECASE
)
NUMBER_RE = re.compile(
r"\d+"
)
# =====================================================
# EXTRACT REFERENCES
# =====================================================
def extract_references(
self,
text: str,
source_section: str
) -> List[dict]:
references = []
matches = (
self.SECTION_RE.finditer(
text
)
)
for match in matches:
raw = match.group(1)
targets = (
self.NUMBER_RE.findall(
raw
)
)
for target in targets:
references.append(
{
"source_section":
source_section,
"target_section":
target,
"reference_type":
"section"
}
)
return references
# =====================================================
# UNIQUE REFERENCES
# =====================================================
def unique_references(
self,
refs: List[dict]
) -> List[dict]:
seen = set()
unique = []
for ref in refs:
key = (
ref["source_section"],
ref["target_section"]
)
if key in seen:
continue
seen.add(key)
unique.append(ref)
return unique
# =====================================================
# VALIDATION
# =====================================================
def validate_references(
self,
refs: List[dict]
) -> List[str]:
errors = []
for ref in refs:
# Skip malformed references
if not isinstance(ref, dict):
errors.append(
"Invalid reference object"
)
continue
if (
"source_section" not in ref
or
"target_section" not in ref
):
errors.append(
"Reference missing source/target section"
)
return errors
# =========================================================
# TEST
# =========================================================
if __name__ == "__main__":
sample = """
Whoever commits murder under section 103
shall be punished.
The provisions of sections 63 and 64
shall also apply.
Nothing in section 111 shall affect
the operation of this section.
"""
extractor = (
ReferenceExtractor()
)
refs = (
extractor.extract_references(
text=sample,
source_section="104"
)
)
refs = (
extractor.unique_references(
refs
)
)
print(
"References:",
len(refs)
)
print()
for r in refs:
print(r)
print()
errors = (
extractor.validate_references(
refs
)
)
print(
"Errors:",
len(errors)
) |