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##########################################################################
#
# Copyright 2010 VMware, Inc.
# All Rights Reserved.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
##########################################################################/
"""C code generation helpers."""
def _string_switch(var, prefix, suffixes, case, default):
index = len(prefix)
indent = ' '*(index + 1)
if len(suffixes) == 1:
suffix = suffixes[0]
chars = list(suffix) + ["\\0"]
predicates = ['%s[%u] == \'%s\'' % (var, index + i, chars[i]) for i in range(len(chars))]
print indent + 'if (%s) {' % (' && '.join(predicates),)
value = prefix + suffix
print indent + ' // %s' % value
case(value)
print indent + '}'
if default is not None:
print indent + 'else {'
default()
print indent + '}'
return
print indent + 'switch (%s[%u]) {' % (var, index)
if "" in suffixes:
print indent + 'case \'\\0\':'
print indent + ' // %s' % prefix
case(prefix)
print indent + ' break;'
chars = [suffix[0] for suffix in suffixes if suffix]
chars = list(set(chars))
chars.sort()
for char in chars:
print indent + 'case \'%c\':' % (char)
new_prefix = prefix + char
new_suffixes = [suffix[1:] for suffix in suffixes if suffix.startswith(char)]
_string_switch(var, new_prefix, new_suffixes, case, default)
print indent + ' break;'
if default is not None:
print indent + 'default:'
default()
print indent + ' break;'
print indent + '}'
def _noop(*args, **kwargs):
pass
def string_switch(var, values, case=_noop, default=None):
"""Product a switch of strings, using a tree character switches."""
values = list(values)
values.sort()
_string_switch(var, '', values, case, default)
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