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#!/usr/bin/env python
#
# Copyright (C) 2012 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Generates default implementations of operator<< for enum types."""
import codecs
import os
import re
import string
import sys
_ENUM_START_RE = re.compile(r'\benum\b\s+(\S+)\s+\{')
_ENUM_VALUE_RE = re.compile(r'([A-Za-z0-9_]+)(.*)')
_ENUM_END_RE = re.compile(r'^\s*\};$')
_ENUMS = {}
_NAMESPACES = {}
def Confused(filename, line_number, line):
sys.stderr.write('%s:%d: confused by:\n%s\n' % (filename, line_number, line))
raise Exception("giving up!")
sys.exit(1)
def ProcessFile(filename):
lines = codecs.open(filename, 'r', 'utf8', 'replace').read().split('\n')
in_enum = False
line_number = 0
namespaces = []
enclosing_classes = []
for raw_line in lines:
line_number += 1
if not in_enum:
# Is this the start of a new enum?
m = _ENUM_START_RE.search(raw_line)
if m:
# Yes, so add an empty entry to _ENUMS for this enum.
enum_name = m.group(1)
if len(enclosing_classes) > 0:
enum_name = '::'.join(enclosing_classes) + '::' + enum_name
_ENUMS[enum_name] = []
_NAMESPACES[enum_name] = '::'.join(namespaces)
in_enum = True
continue
# Is this the start or end of a namespace?
m = re.compile(r'^namespace (\S+) \{').search(raw_line)
if m:
namespaces.append(m.group(1))
continue
m = re.compile(r'^\}\s+// namespace').search(raw_line)
if m:
namespaces = namespaces[0:len(namespaces) - 1]
continue
# Is this the start or end of an enclosing class or struct?
m = re.compile(r'^(?:class|struct)(?: MANAGED)? (\S+).* \{').search(raw_line)
if m:
enclosing_classes.append(m.group(1))
continue
m = re.compile(r'^\};').search(raw_line)
if m:
enclosing_classes = enclosing_classes[0:len(enclosing_classes) - 1]
continue
continue
# Is this the end of the current enum?
m = _ENUM_END_RE.search(raw_line)
if m:
if not in_enum:
Confused(filename, line_number, raw_line)
in_enum = False
continue
# The only useful thing in comments is the <<alternate text>> syntax for
# overriding the default enum value names. Pull that out...
enum_text = None
m_comment = re.compile(r'// <<(.*?)>>').search(raw_line)
if m_comment:
enum_text = m_comment.group(1)
# ...and then strip // comments.
line = re.sub(r'//.*', '', raw_line)
# Strip whitespace.
line = line.strip()
# Skip blank lines.
if len(line) == 0:
continue
# Since we know we're in an enum type, and we're not looking at a comment
# or a blank line, this line should be the next enum value...
m = _ENUM_VALUE_RE.search(line)
if not m:
Confused(filename, line_number, raw_line)
enum_value = m.group(1)
# By default, we turn "kSomeValue" into "SomeValue".
if enum_text == None:
enum_text = enum_value
if enum_text.startswith('k'):
enum_text = enum_text[1:]
# Lose literal values because we don't care; turn "= 123, // blah" into ", // blah".
rest = m.group(2).strip()
m_literal = re.compile(r'= (0x[0-9a-f]+|-?[0-9]+|\'.\')').search(rest)
if m_literal:
rest = rest[(len(m_literal.group(0))):]
# With "kSomeValue = kOtherValue," we take the original and skip later synonyms.
# TODO: check that the rhs is actually an existing value.
if rest.startswith('= k'):
continue
# Remove any trailing comma and whitespace
if rest.startswith(','):
rest = rest[1:]
rest = rest.strip()
# There shouldn't be anything left.
if len(rest):
Confused(filename, line_number, raw_line)
if len(enclosing_classes) > 0:
enum_value = '::'.join(enclosing_classes) + '::' + enum_value
_ENUMS[enum_name].append((enum_value, enum_text))
def main():
local_path = sys.argv[1]
header_files = []
for header_file in sys.argv[2:]:
header_files.append(header_file)
ProcessFile(header_file)
print '#include <iostream>'
print
for header_file in header_files:
header_file = header_file.replace(local_path + '/', '')
print '#include "%s"' % header_file
print
for enum_name in _ENUMS:
print '// This was automatically generated by %s --- do not edit!' % sys.argv[0]
namespaces = _NAMESPACES[enum_name].split('::')
for namespace in namespaces:
print 'namespace %s {' % namespace
print 'std::ostream& operator<<(std::ostream& os, const %s& rhs) {' % enum_name
print ' switch (rhs) {'
for (enum_value, enum_text) in _ENUMS[enum_name]:
print ' case %s: os << "%s"; break;' % (enum_value, enum_text)
print ' default: os << "%s[" << static_cast<int>(rhs) << "]"; break;' % enum_name
print ' }'
print ' return os;'
print '}'
for namespace in reversed(namespaces):
print '} // namespace %s' % namespace
print
sys.exit(0)
if __name__ == '__main__':
main()
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