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210 lines
6.3 KiB
210 lines
6.3 KiB
#!/usr/bin/env python |
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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 os |
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import re |
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import string |
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import sys |
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_ENUM_START_RE = re.compile(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' % (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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in_enum = False |
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is_enum_private = False |
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is_enum_class = False |
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line_number = 0 |
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namespaces = [] |
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enclosing_classes = [] |
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for raw_line in lines: |
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line_number += 1 |
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if not in_enum: |
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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 add an empty entry to _ENUMS for this enum. |
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# Except when it's private |
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if m.group(3) is not None: |
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is_enum_private = True |
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else: |
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is_enum_private = False |
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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(enclosing_classes) > 0: |
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enum_name = '::'.join(enclosing_classes) + '::' + enum_name |
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_ENUMS[enum_name] = [] |
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_NAMESPACES[enum_name] = '::'.join(namespaces) |
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_ENUM_CLASSES[enum_name] = is_enum_class |
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in_enum = True |
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continue |
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# Is this the start or end of a namespace? |
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m = re.compile(r'^namespace (\S+) \{').search(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.compile(r'^\}\s+// namespace').search(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.compile(r'^\s*(?:class|struct)(?: MANAGED)?(?: PACKED\([0-9]\))? (\S+).* \{').search(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.compile(r'^\s*\}(\s+)?(while)?(.+)?;').search(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 not in_enum: |
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Confused(filename, line_number, raw_line) |
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in_enum = False |
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continue |
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if is_enum_private: |
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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.compile(r'// <<(.*?)>>').search(raw_line) |
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if m_comment: |
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enum_text = m_comment.group(1) |
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# ...and then 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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# 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 == 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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# Lose literal values because we don't care; turn "= 123, // blah" into ", // blah". |
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rest = m.group(2).strip() |
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m_literal = re.compile(r'= (0x[0-9a-f]+|-?[0-9]+|\'.\')').search(rest) |
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if m_literal: |
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rest = rest[(len(m_literal.group(0))):] |
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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 any trailing comma and whitespace |
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if rest.startswith(','): |
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rest = rest[1:] |
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rest = rest.strip() |
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# There shouldn't be anything left. |
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if len(rest): |
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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(enclosing_classes) > 0: |
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enum_value = '::'.join(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 %s --- do not edit!' % sys.argv[0]) |
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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('std::ostream& operator<<(std::ostream& os, const %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(' 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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