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from typing import Any, Dict, List, Set, Tuple
from .coverage_record import CoverageRecord
from .llvm_coverage_segment import LlvmCoverageSegment, parse_segments
class LlvmCoverageParser:
"""
Accepts a parsed json produced by llvm-cov export -- typically,
representing a single C++ test and produces a list
of CoverageRecord(s).
"""
def __init__(self, llvm_coverage: Dict[str, Any]) -> None:
self._llvm_coverage = llvm_coverage
@staticmethod
def _skip_coverage(path: str) -> bool:
"""
Returns True if file path should not be processed.
This is repo-specific and only makes sense for the current state of
ovrsource.
"""
if "/third-party/" in path:
return True
return False
@staticmethod
def _collect_coverage(
segments: List[LlvmCoverageSegment],
) -> Tuple[List[int], List[int]]:
"""
Stateful parsing of coverage segments.
"""
covered_lines: Set[int] = set()
uncovered_lines: Set[int] = set()
prev_segment = LlvmCoverageSegment(1, 0, 0, 0, 0, None)
for segment in segments:
covered_range, uncovered_range = segment.get_coverage(prev_segment)
covered_lines.update(covered_range)
uncovered_lines.update(uncovered_range)
prev_segment = segment
uncovered_lines.difference_update(covered_lines)
return sorted(covered_lines), sorted(uncovered_lines)
def parse(self, repo_name: str) -> List[CoverageRecord]:
# The JSON format is described in the LLVM source code
# https://github.com/llvm-mirror/llvm/blob/master/tools/llvm-cov/CoverageExporterJson.cpp
records: List[CoverageRecord] = []
for export_unit in self._llvm_coverage["data"]:
for file_info in export_unit["files"]:
filepath = file_info["filename"]
if self._skip_coverage(filepath):
continue
if filepath is None:
continue
segments = file_info["segments"]
covered_lines, uncovered_lines = self._collect_coverage(
parse_segments(segments)
)
records.append(CoverageRecord(filepath, covered_lines, uncovered_lines))
return records
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