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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.
#
#
import pyparsing as pp
# 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 = pp.Suppress.using_each("{}=,")
_enum = pp.Suppress("enum")
identifier = pp.Word(pp.alphas + "_", pp.alphanums + "_")
integer = pp.Word(pp.nums)
enumValue = pp.Group(identifier("name") + pp.Optional(EQ + integer("value")))
enumList = pp.Group(enumValue + (COMMA + enumValue)[...])
enum = _enum + identifier("enum") + LBRACE + enumList("names") + RBRACE
# find instances of enums ignoring other syntax
for item, start, stop in enum.scan_string(sample):
idx = 0
for entry in item.names:
if entry.value != "":
idx = int(entry.value)
print("%s_%s = %d" % (item.enum.upper(), entry.name.upper(), idx))
idx += 1
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