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# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
"""LCOV reporting for coverage.py."""
import sys
import base64
from hashlib import md5
from coverage.report import get_analysis_to_report
class LcovReporter:
"""A reporter for writing LCOV coverage reports."""
report_type = "LCOV report"
def __init__(self, coverage):
self.coverage = coverage
self.config = self.coverage.config
def report(self, morfs, outfile=None):
"""Renders the full lcov report
'morfs' is a list of modules or filenames
outfile is the file object to write the file into.
"""
self.coverage.get_data()
outfile = outfile or sys.stdout
for fr, analysis in get_analysis_to_report(self.coverage, morfs):
self.get_lcov(fr, analysis, outfile)
def get_lcov(self, fr, analysis, outfile=None):
"""Produces the lcov data for a single file
get_lcov currently supports both line and branch coverage,
however function coverage is not supported.
"""
outfile.write("TN:\n")
outfile.write(f"SF:{fr.relative_filename()}\n")
source_lines = fr.source().splitlines()
for covered in sorted(analysis.executed):
# Note: Coveragepy currently only supports checking *if* a line has
# been executed, not how many times, so we set this to 1 for nice
# output even if it's technically incorrect
# The lines below calculate a 64 bit encoded md5 hash of the line
# corresponding to the DA lines in the lcov file,
# for either case of the line being covered or missed in Coveragepy
# The final two characters of the encoding ("==") are removed from
# the hash to allow genhtml to run on the resulting lcov file
if source_lines:
line = source_lines[covered - 1].encode("utf-8")
else:
line = b""
hashed = str(base64.b64encode(md5(line).digest())[:-2], encoding="utf-8")
outfile.write(f"DA:{covered},1,{hashed}\n")
for missed in sorted(analysis.missing):
if source_lines:
line = source_lines[missed - 1].encode("utf-8")
else:
line = b""
hashed = str(base64.b64encode(md5(line).digest())[:-2], encoding="utf-8")
outfile.write(f"DA:{missed},0,{hashed}\n")
outfile.write(f"LF:{len(analysis.statements)}\n")
outfile.write(f"LH:{len(analysis.executed)}\n")
# More information dense branch coverage data
missing_arcs = analysis.missing_branch_arcs()
executed_arcs = analysis.executed_branch_arcs()
for block_number, block_line_number in enumerate(
sorted(analysis.branch_stats().keys())
):
for branch_number, line_number in enumerate(
sorted(missing_arcs[block_line_number])
):
# The exit branches have a negative line number,
# this will not produce valid lcov, and so setting
# the line number of the exit branch to 0 will allow
# for valid lcov, while preserving the data
line_number = max(line_number, 0)
outfile.write(f"BRDA:{line_number},{block_number},{branch_number},-\n")
# The start value below allows for the block number to be
# preserved between these two for loops (stopping the loop from
# resetting the value of the block number to 0)
for branch_number, line_number in enumerate(
sorted(executed_arcs[block_line_number]),
start=len(missing_arcs[block_line_number]),
):
line_number = max(line_number, 0)
outfile.write(f"BRDA:{line_number},{block_number},{branch_number},1\n")
# Summary of the branch coverage
if analysis.has_arcs():
branch_stats = analysis.branch_stats()
brf = sum(t for t, k in branch_stats.values())
brh = brf - sum(t - k for t, k in branch_stats.values())
outfile.write(f"BRF:{brf}\n")
outfile.write(f"BRH:{brh}\n")
outfile.write("end_of_record\n")
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