def get_patched_content(self):
"""Get self.patched_content, computing it if necessary.
This is the content of the file after applying this patch.
Returns:
a Content instance.
Raises:
engine.FetchError: If there was a problem fetching the old content.
"""
try:
if self.patched_content is not None:
return self.patched_content
except db.Error:
# This may happen when a Content entity was deleted behind our
# back.
self.patched_content = None
old_lines = self.get_content().text.splitlines(True)
logging.info('Creating patched_content for %s', self.filename)
chunks = patching.ParsePatchToChunks(self.lines, self.filename)
new_lines = []
for _, _, new in patching.PatchChunks(old_lines, chunks):
new_lines.extend(new)
text = db.Text(''.join(new_lines))
patched_content = Content(text=text, parent=self)
patched_content.put()
self.patched_content = patched_content
self.put()
return patched_content
def _apply_patch(old_lines, patch_name, dif_lines):
new_lines = []
chunks = patching.ParsePatchToChunks(dif_lines, patch_name)
for tag, old, new in patching.PatchChunks(old_lines, chunks):
new_lines.extend(new)
return ''.join(new_lines)