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#!/usr/bin/python
#
# Copyright 2012 Google Inc. All Rights Reserved.
#
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# modification, are permitted provided that the following conditions are
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# * Redistributions of source code must retain the above copyright
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"""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))
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) (\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
# Whitespace?
line = raw_line.strip()
if len(line) == 0:
continue
# Is this another 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".
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()
# Anything left should be a comment.
if len(rest) and not rest.startswith('// '):
Confused(filename, line_number, raw_line)
m_comment = re.compile(r'<<(.*?)>>').search(rest)
if m_comment:
enum_text = m_comment.group(1)
if len(enclosing_classes) > 0:
enum_value = '::'.join(enclosing_classes) + '::' + enum_value
_ENUMS[enum_name].append((enum_value, enum_text))
def main():
header_files = []
for header_file in sys.argv[1:]:
header_files.append(header_file)
ProcessFile(header_file)
print '#include <iostream>'
print
for header_file in header_files:
# Make gives us paths relative to the top of the tree, but our -I is art/.
# We also have -I art/src/, but icu4c is higher on the include path and has a "mutex.h" too.
header_file = header_file.replace('art/', '')
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()