From a7f9dda0668bfce4fba51df1bf2976b4a93a8bd5 Mon Sep 17 00:00:00 2001
From: Paul McGuire <ptmcg@austin.rr.com>
Date: Tue, 2 Oct 2012 04:55:56 +0000
Subject: Add example files to SVN

---
 src/examples/cpp_enum_parser.py | 52 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 src/examples/cpp_enum_parser.py

(limited to 'src/examples/cpp_enum_parser.py')

diff --git a/src/examples/cpp_enum_parser.py b/src/examples/cpp_enum_parser.py
new file mode 100644
index 0000000..70d60c0
--- /dev/null
+++ b/src/examples/cpp_enum_parser.py
@@ -0,0 +1,52 @@
+#
+# cpp_enum_parser.py
+#
+# Posted by Mark Tolenen 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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