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#
# cpp_enum_parser.py
#
# Posted by Mark Tolonen on comp.lang.python in August, 2009,
# Used with permission.
#
# Parser that scans through C or C++ code for enum definitions, and
# generates corresponding Python constant definitions.
#
#
from pyparsing import *
# sample string with enums and other stuff
sample = '''
stuff before
enum hello {
Zero,
One,
Two,
Three,
Five=5,
Six,
Ten=10
};
in the middle
enum blah
{
alpha,
beta,
gamma = 10 ,
zeta = 50
};
at the end
'''
# syntax we don't want to see in the final parse tree
LBRACE,RBRACE,EQ,COMMA = map(Suppress,"{}=,")
_enum = Suppress('enum')
identifier = Word(alphas,alphanums+'_')
integer = Word(nums)
enumValue = Group(identifier('name') + Optional(EQ + integer('value')))
enumList = Group(enumValue + ZeroOrMore(COMMA + enumValue))
enum = _enum + identifier('enum') + LBRACE + enumList('names') + RBRACE
# find instances of enums ignoring other syntax
for item,start,stop in enum.scanString(sample):
id = 0
for entry in item.names:
if entry.value != '':
id = int(entry.value)
print('%s_%s = %d' % (item.enum.upper(),entry.name.upper(),id))
id += 1
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