Method process_diff

modules/handler.py:425–469

r"""Parse unified diff with 0 lines of context. Hunk range info format: @@ -3,2 +4,0 @@ Hunk originally starting at line 3, and occupying 2 lines, now starts at line 4, and occupies 0 lines, i.e. it was deleted. @@ -9 +10,2 @@ Hunk siz

(diff_str)

    @staticmethod
    def process_diff(diff_str):
        r"""Parse unified diff with 0 lines of context.

        Hunk range info format:
          @@ -3,2 +4,0 @@
            Hunk originally starting at line 3, and occupying 2 lines, now
            starts at line 4, and occupies 0 lines, i.e. it was deleted.
          @@ -9 +10,2 @@
            Hunk size can be omitted, and defaults to one line.

        Dealing with ambiguous hunks:
          "A\nB\n" -> "C\n"
          Was 'A' modified, and 'B' deleted? Or 'B' modified, 'A' deleted?
          Or both deleted? To minimize confusion, let's simply mark the
          hunk as modified.

        Arguments:
            diff_str (string): The unified diff string to parse.

        Returns:
            tuple: (first, last, [inserted], [modified], [deleted])
                A tuple with meta information of the diff result.
        """
        # first and last changed line in the view
        first, last = 0, 0
        # lists with inserted, modified and deleted lines
        inserted, modified, deleted = [], [], []
        hunk_re = r'^@@ \-(\d+),?(\d*) \+(\d+),?(\d*) @@'
        for hunk in re.finditer(hunk_re, diff_str, re.MULTILINE):
            _, old_size, start, new_size = hunk.groups()
            start = int(start)
            old_size = int(old_size or 1)
            new_size = int(new_size or 1)
            if first == 0:
                first = max(1, start)
            if not old_size:
                last = start + new_size
                inserted += range(start, last)
            elif not new_size:
                last = start + 1
                deleted.append(last)
            else:
                last = start + new_size
                modified += range(start, last)
        return (first, last, inserted, modified, deleted)

    def diff_changed_blocks(self):
        """Create a list of all changed code blocks from cached diff result.