+def count_spaces(l):
+ for i in range(len(l)):
+ if l[i] != ' ':
+ return i
+ return 0
+
+def annoying_case_hack_filter(code):
+ """add annoying "silent keyword" (fallthrough)
+
+ this which tricks the parser into taking the (silent) case statement
+ as a "small expression". it can then be spotted and used to indicate
+ "fall through" to the next case (in the parser)
+
+ bugs: any function that starts with the letters "case" or "default"
+ will be detected erroneously. fixing that involves doing a token
+ lexer which spots the fact that "case" and "default" are words,
+ separating them from space, colon, bracket etc.
+
+ http://bugs.libre-riscv.org/show_bug.cgi?id=280
+ """
+ res = []
+ prev_spc_count = None
+ for l in code.split("\n"):
+ spc_count = count_spaces(l)
+ nwhite = l[spc_count:]
+ if nwhite.startswith("case") or nwhite.startswith("default"):
+ #print ("case/default", nwhite, spc_count, prev_spc_count)
+ if (prev_spc_count is not None and
+ prev_spc_count == spc_count and
+ (res[-1].endswith(":") or res[-1].endswith(": fallthrough"))):
+ res[-1] += " fallthrough" # add to previous line
+ prev_spc_count = spc_count
+ else:
+ #print ("notstarts", spc_count, nwhite)
+ prev_spc_count = None
+ res.append(l)
+ return '\n'.join(res)
+