229 lines
8.1 KiB
Python
Executable File
229 lines
8.1 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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# Copyright (C) 2012 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Generates default implementations of operator<< for enum types."""
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import codecs
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import re
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import sys
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_ENUM_START_RE = re.compile(
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r'\benum\b\s+(class\s+)?(\S+)\s+:?.*\{(\s+// private)?')
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_ENUM_VALUE_RE = re.compile(r'([A-Za-z0-9_]+)(.*)')
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_ENUM_END_RE = re.compile(r'^\s*\};$')
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_ENUMS = {}
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_NAMESPACES = {}
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_ENUM_CLASSES = {}
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def Confused(filename, line_number, line):
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sys.stderr.write('%s:%d: confused by:\n%s\n' %
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(filename, line_number, line))
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raise Exception("giving up!")
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sys.exit(1)
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def ProcessFile(filename):
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lines = codecs.open(filename, 'r', 'utf8', 'replace').read().split('\n')
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class EnumLines:
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def __init__(self, ns, ec):
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self.namespaces = ns
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self.enclosing_classes = ec
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self.lines = []
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def generate_enum_lines(l):
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line_number = 0
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enum_lines = None
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namespaces = []
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enclosing_classes = []
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for raw_line in l:
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line_number += 1
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if enum_lines is None:
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# Is this the start of a new enum?
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m = _ENUM_START_RE.search(raw_line)
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if m:
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# Yes, so create new line list.
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enum_lines = EnumLines(namespaces[:], enclosing_classes[:])
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enum_lines.lines.append((raw_line, line_number))
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continue
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# Is this the start or end of a namespace?
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m = re.search(r'^namespace (\S+) \{', raw_line)
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if m:
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namespaces.append(m.group(1))
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continue
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m = re.search(r'^\}\s+// namespace', raw_line)
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if m:
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namespaces = namespaces[0:len(namespaces) - 1]
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continue
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# Is this the start or end of an enclosing class or struct?
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m = re.search(
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r'^\s*(?:class|struct)(?: MANAGED)?(?: PACKED\([0-9]\))? (\S+).* \{', raw_line)
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if m:
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enclosing_classes.append(m.group(1))
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continue
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# End of class/struct -- be careful not to match "do { ... } while" constructs by accident
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m = re.search(r'^\s*\}(\s+)?(while)?(.+)?;', raw_line)
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if m and not m.group(2):
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enclosing_classes = enclosing_classes[0:len(enclosing_classes) - 1]
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continue
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continue
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# Is this the end of the current enum?
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m = _ENUM_END_RE.search(raw_line)
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if m:
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if enum_lines is None:
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Confused(filename, line_number, raw_line)
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yield enum_lines
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enum_lines = None
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continue
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# Append the line
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enum_lines.lines.append((raw_line, line_number))
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for enum_lines in generate_enum_lines(lines):
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m = _ENUM_START_RE.search(enum_lines.lines[0][0])
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if m.group(3) is not None:
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# Skip private enums.
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continue
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# Add an empty entry to _ENUMS for this enum.
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is_enum_class = m.group(1) is not None
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enum_name = m.group(2)
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if len(enum_lines.enclosing_classes) > 0:
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enum_name = '::'.join(enum_lines.enclosing_classes) + '::' + enum_name
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_ENUMS[enum_name] = []
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_NAMESPACES[enum_name] = '::'.join(enum_lines.namespaces)
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_ENUM_CLASSES[enum_name] = is_enum_class
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def generate_non_empty_line(lines):
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for raw_line, line_number in lines:
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# Strip // comments.
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line = re.sub(r'//.*', '', raw_line)
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# Strip whitespace.
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line = line.strip()
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# Skip blank lines.
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if len(line) == 0:
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continue
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# The only useful thing in comments is the <<alternate text>> syntax for
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# overriding the default enum value names. Pull that out...
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enum_text = None
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m_comment = re.search(r'// <<(.*?)>>', raw_line)
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if m_comment:
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enum_text = m_comment.group(1)
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yield (line, enum_text, raw_line, line_number)
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for line, enum_text, raw_line, line_number in generate_non_empty_line(enum_lines.lines[1:]):
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# Since we know we're in an enum type, and we're not looking at a comment
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# or a blank line, this line should be the next enum value...
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m = _ENUM_VALUE_RE.search(line)
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if not m:
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Confused(filename, line_number, raw_line)
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enum_value = m.group(1)
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# By default, we turn "kSomeValue" into "SomeValue".
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if enum_text is None:
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enum_text = enum_value
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if enum_text.startswith('k'):
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enum_text = enum_text[1:]
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# Check that we understand the line (and hopefully do not parse incorrectly), or should
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# filter.
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rest = m.group(2).strip()
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# With "kSomeValue = kOtherValue," we take the original and skip later synonyms.
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# TODO: check that the rhs is actually an existing value.
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if rest.startswith('= k'):
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continue
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# Remove trailing comma.
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if rest.endswith(','):
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rest = rest[:-1]
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# We now expect rest to be empty, or an assignment to an "expression."
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if len(rest):
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# We want to lose the expression "= [exp]". As we do not have a real C parser, just
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# assume anything without a comma is valid.
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m_exp = re.match('= [^,]+$', rest)
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if m_exp is None:
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sys.stderr.write('%s\n' % (rest))
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Confused(filename, line_number, raw_line)
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# If the enum is scoped, we must prefix enum value with enum name (which is already prefixed
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# by enclosing classes).
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if is_enum_class:
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enum_value = enum_name + '::' + enum_value
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else:
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if len(enum_lines.enclosing_classes) > 0:
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enum_value = '::'.join(enum_lines.enclosing_classes) + '::' + enum_value
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_ENUMS[enum_name].append((enum_value, enum_text))
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def main():
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local_path = sys.argv[1]
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header_files = []
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for header_file in sys.argv[2:]:
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header_files.append(header_file)
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ProcessFile(header_file)
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print('#include <iostream>')
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print('')
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for header_file in header_files:
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header_file = header_file.replace(local_path + '/', '')
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print('#include "%s"' % header_file)
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print('')
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for enum_name in _ENUMS:
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print('// This was automatically generated by art/tools/generate_operator_out.py --- do not edit!')
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namespaces = _NAMESPACES[enum_name].split('::')
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for namespace in namespaces:
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print('namespace %s {' % namespace)
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print(
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'std::ostream& operator<<(std::ostream& os, %s rhs) {' % enum_name)
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print(' switch (rhs) {')
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for (enum_value, enum_text) in _ENUMS[enum_name]:
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print(' case %s: os << "%s"; break;' % (enum_value, enum_text))
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if not _ENUM_CLASSES[enum_name]:
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print(
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' default: os << "%s[" << static_cast<int>(rhs) << "]"; break;' % enum_name)
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print(' }')
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print(' return os;')
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print('}')
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for namespace in reversed(namespaces):
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print('} // namespace %s' % namespace)
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print('')
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sys.exit(0)
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if __name__ == '__main__':
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main()
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