1278 

  1279 def scanpatch(fp):

  1280     """like patch.iterhunks, but yield different events

  1281 

  1282     - ('file',    [header_lines + fromfile + tofile])

  1283     - ('context', [context_lines])

  1284     - ('hunk',    [hunk_lines])

  1285     - ('range',   (-start,len, +start,len, proc))

  1286     """

  1287     lines_re = re.compile(r'@@ -(\d+),(\d+) \+(\d+),(\d+) @@\s*(.*)')

  1288     lr = linereader(fp)

  1289 

  1290     def scanwhile(first, p):

  1291         """scan lr while predicate holds"""

  1292         lines = [first]

  1293         while True:

  1294             line = lr.readline()

  1295             if not line:

  1296                 break

  1297             if p(line):

  1298                 lines.append(line)

  1299             else:

  1300                 lr.push(line)

  1301                 break

  1302         return lines

  1303 

  1304     while True:

  1305         line = lr.readline()

  1306         if not line:

  1307             break

  1308         if line.startswith('diff --git a/') or line.startswith('diff -r '):

  1309             def notheader(line):

  1310                 s = line.split(None, 1)

  1311                 return not s or s[0] not in ('---', 'diff')

  1312             header = scanwhile(line, notheader)

  1313             fromfile = lr.readline()

  1314             if fromfile.startswith('---'):

  1315                 tofile = lr.readline()

  1316                 header += [fromfile, tofile]

  1317             else:

  1318                 lr.push(fromfile)

  1319             yield 'file', header

  1320         elif line[0] == ' ':

  1321             yield 'context', scanwhile(line, lambda l: l[0] in ' \\')

  1322         elif line[0] in '-+':

  1323             yield 'hunk', scanwhile(line, lambda l: l[0] in '-+\\')

  1324         else:

  1325             m = lines_re.match(line)

  1326             if m:

  1327                 yield 'range', m.groups()

  1328             else:

  1329                 yield 'other', line