def _build_coverage_map()

in bot/code_coverage_bot/phabricator.py [0:0]

• 8 lines of code
• 6 McCabe index (conditional complexity)

    def _build_coverage_map(self, annotate, coverage_record):
        # We can't use plain line numbers to map coverage data from the build changeset to the
        # changeset of interest, indeed there could be intermediate changesets between them
        # modifying the same lines, thus displacing the line numbers.
        # In order to uniquely identify lines, and thus map coverage data, we use the annotate
        # data. The line number and changeset where a line was introduced are unique, so whenever
        # they match in the annotate data of the two changesets, we can be sure that it is the
        # same line.
        coverage_map = {}

        for lineno, (orig_changeset, orig_line) in enumerate(annotate):
            key = (orig_changeset, orig_line)
            # Assume lines outside the coverage record are uncoverable (that happens for the
            # last few lines of a file, they are not considered by instrumentation).
            coverage_map[key] = (
                coverage_record[lineno] if lineno < len(coverage_record) else -1
            )

        return coverage_map