1 ##########################################################################
3 # Copyright 2010 VMware, Inc.
6 # Permission is hereby granted, free of charge, to any person obtaining a copy
7 # of this software and associated documentation files (the "Software"), to deal
8 # in the Software without restriction, including without limitation the rights
9 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 # copies of the Software, and to permit persons to whom the Software is
11 # furnished to do so, subject to the following conditions:
13 # The above copyright notice and this permission notice shall be included in
14 # all copies or substantial portions of the Software.
16 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 ##########################################################################/
27 """C code generation helpers."""
30 def _string_switch(var, prefix, suffixes, case, default):
32 indent = ' '*(index + 1)
34 if len(suffixes) == 1:
36 chars = list(suffix) + ["\\0"]
37 predicates = ['%s[%u] == \'%s\'' % (var, index + i, chars[i]) for i in range(len(chars))]
38 print indent + 'if (%s) {' % (' && '.join(predicates),)
39 value = prefix + suffix
40 print indent + ' // %s' % value
43 if default is not None:
44 print indent + 'else {'
49 print indent + 'switch (%s[%u]) {' % (var, index)
51 print indent + 'case \'\\0\':'
52 print indent + ' // %s' % prefix
54 print indent + ' break;'
56 chars = [suffix[0] for suffix in suffixes if suffix]
57 chars = list(set(chars))
61 print indent + 'case \'%c\':' % (char)
62 new_prefix = prefix + char
63 new_suffixes = [suffix[1:] for suffix in suffixes if suffix.startswith(char)]
64 _string_switch(var, new_prefix, new_suffixes, case, default)
65 print indent + ' break;'
66 if default is not None:
67 print indent + 'default:'
69 print indent + ' break;'
73 def _noop(*args, **kwargs):
77 def string_switch(var, values, case=_noop, default=None):
78 """Product a switch of strings, using a tree character switches."""
81 _string_switch(var, '', values, case, default)