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| author | Cengiz Kaygusuz <cngkaygusuz@gmail.com> | 2017-11-20 20:46:39 -0500 |
|---|---|---|
| committer | Cengiz Kaygusuz <cngkaygusuz@gmail.com> | 2017-11-20 20:46:39 -0500 |
| commit | 27e183a78c8062ed7c2bbb91655a5e56cd697bba (patch) | |
| tree | 88fd355a0cc6da4c130582e092d702836596cbb2 /examples/cpp_enum_parser.py | |
| parent | 4ba589cf13588e90992e23deb5a9784340efd2cc (diff) | |
| download | pyparsing-git-27e183a78c8062ed7c2bbb91655a5e56cd697bba.tar.gz | |
Move src to root
Diffstat (limited to 'examples/cpp_enum_parser.py')
| -rw-r--r-- | examples/cpp_enum_parser.py | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/examples/cpp_enum_parser.py b/examples/cpp_enum_parser.py new file mode 100644 index 0000000..cd8f525 --- /dev/null +++ b/examples/cpp_enum_parser.py @@ -0,0 +1,52 @@ +#
+# 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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