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https://github.com/aantron/better-enums.git
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f74de74604
enum.h tries to automatically detect whether it is running with C++11 support. If not, it emits alternative code that is supposed to work on compilers supporting C++98 and variadic macros. This code is largely interface-compatible with the C++11 code, with the following semantic differences: - No compile-time stringization. This is done upon first use of a function other than to_integral. - Implicit conversion to integral types. This is due to the lack of enum class support. - The values _name, _names, _values are replaced with functions _name_, _names_, _values_.
141 lines
5.6 KiB
Python
Executable File
141 lines
5.6 KiB
Python
Executable File
#! /usr/bin/env python
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# This file is part of Better Enums, released under the BSD 2-clause license.
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# See LICENSE for details, or visit http://github.com/aantron/better-enums.
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# This script generates the macros _ENUM_PP_MAP and _ENUM_ITERATE, used
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# internally by enum.h. These are already inlined into enum.h. You only need
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# this script if you are developing enum.h, or run into a limit.
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#
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# _ENUM_PP_MAP has a limit, which determines the maximum number of constants an
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# enum can have. By default, this limit is 64 constants.
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#
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# _ENUM_ITERATE also has a limit. This one determines the maximum length of the
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# name of a constant that is followed by an explicit setting (" = 2"). By
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# default, this is 23 (24 with the obligatory null terminator). Constants
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# without explicit setting can have any length.
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#
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# If either of these limits is inadequate, you can still compile your code
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# without changing enum.h. You need to generate an external macro file with
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# definitions of these macros with relaxed limits, and tell enum.h to use the
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# external macro file. Here is how this is done, supposing you want support for
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# 512 constants of length up to 127 (128 with null terminator):
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#
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# 0. MACRO_FILE is the name of the external macro file. Make sure you put it
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# somewhere in your include path.
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# 1. Run python pp_map_gen.py 512 128 > MACRO_FILE
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# 2. Build your code with an additional compiler flag:
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# - for gcc and clang, -BETTER_ENUMS_MACRO_FILE='<MACRO_FILE>'
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# - for VC++, /BETTER_ENUMS_MACRO_FILE='<MACRO_FILE>'
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# or use any other method of getting these macros declared.
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# 3. Compile your code. Your macro file should be included, and enum.h should
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# happily work with whatever limits you chose.
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import os
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import sys
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class MultiLine(object):
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def __init__(self, stream, indent = 4, columns = 80, initial_column = 0):
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self._columns_left = columns - initial_column
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self._indent = indent
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self._columns = columns
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self._stream = stream
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def write(self, token, last = False):
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break_line = False
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if last:
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if len(token) > self._columns_left:
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break_line = True
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else:
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if len(token) > self._columns_left - 1:
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break_line = True
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if break_line:
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print >> self._stream, ' ' * (self._columns_left - 1) + '\\'
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self._stream.write(' ' * self._indent)
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self._columns_left = self._columns - self._indent
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token = token.lstrip()
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self._stream.write(token)
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self._columns_left -= len(token)
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def generate(stream, constants, length, script):
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print >> stream, '// This file was automatically generated by ' + script
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print >> stream, ''
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print >> stream, '#pragma once'
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print >> stream, ''
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print >> stream, '#ifndef _BETTER_ENUM_MACRO_FILE_H_'
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print >> stream, '#define _BETTER_ENUM_MACRO_FILE_H_'
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print >> stream, ''
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print >> stream, '#define _ENUM_PP_MAP(macro, data, ...) \\'
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print >> stream, ' _ENUM_A(_ENUM_PP_MAP_VAR_COUNT, ' + \
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'_ENUM_PP_COUNT(__VA_ARGS__)) \\'
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print >> stream, ' (macro, data, __VA_ARGS__)'
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print >> stream, ''
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print >> stream, '#define _ENUM_PP_MAP_VAR_COUNT(count) ' + \
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'_ENUM_M ## count'
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print >> stream, ''
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print >> stream, '#define _ENUM_A(macro, ...) macro(__VA_ARGS__)'
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print >> stream, ''
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print >> stream, '#define _ENUM_M1(m, d, x) _ENUM_A(m, d, 0, x)'
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for index in range(2, constants + 1):
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print >> stream, '#define _ENUM_M' + str(index) + \
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'(m,d,x,...) _ENUM_A(m,d,' + str(index - 1) + \
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',x) _ENUM_M' + str(index - 1) + \
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'(m,d,__VA_ARGS__)'
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print >> stream, ''
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pp_count_impl_prefix = '#define _ENUM_PP_COUNT_IMPL(_1,'
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stream.write(pp_count_impl_prefix)
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pp_count_impl = MultiLine(stream = stream, indent = 4,
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initial_column = len(pp_count_impl_prefix))
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for index in range(2, constants + 1):
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pp_count_impl.write(' _' + str(index) + ',')
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pp_count_impl.write(' count,')
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pp_count_impl.write(' ...)')
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pp_count_impl.write(' count', last = True)
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print >> stream, ''
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print >> stream, ''
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pp_count_prefix = \
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'#define _ENUM_PP_COUNT(...) _ENUM_PP_COUNT_IMPL(__VA_ARGS__,'
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stream.write(pp_count_prefix)
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pp_count = MultiLine(stream = stream, indent = 4,
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initial_column = len(pp_count_prefix))
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for index in range(0, constants - 1):
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pp_count.write(' ' + str(constants - index) + ',')
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pp_count.write(' 1)', last = True)
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print >> stream, ''
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print >> stream, ''
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iterate_prefix = '#define _ENUM_ITERATE(X, f, l)'
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stream.write(iterate_prefix)
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iterate = MultiLine(stream = stream, indent = 4,
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initial_column = len(iterate_prefix))
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for index in range(0, length):
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iterate.write(' X(f, l, %i)' % index)
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print >> stream, ''
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print >> stream, ''
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print >> stream, '#endif // #ifndef _BETTER_ENUM_MACRO_FILE_H_'
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if __name__ == '__main__':
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if len(sys.argv) != 3:
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print >> sys.stderr, \
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'Usage: ' + sys.argv[0] + ' CONSTANTS LENGTH > FILE'
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print >> sys.stderr, ''
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print >> sys.stderr, 'Prints map macro definition to FILE.'
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print >> sys.stderr, 'CONSTANTS is the number of constants to support.'
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print >> sys.stderr, 'LENGTH is the maximum length of a constant name.'
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sys.exit(1)
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generate(sys.stdout, int(sys.argv[1]), int(sys.argv[2]),
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os.path.basename(sys.argv[0]))
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sys.exit(0)
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