From 36df29ba71df48beb838e60d9a5a2616fb3a8fb3 Mon Sep 17 00:00:00 2001
From: Siu Kwan Lam <michael.lam.sk@gmail.com>
Date: Tue, 22 Jan 2013 11:49:41 -0600
Subject: [PATCH] Add enum support

---
 newbinding/binding.py | 46 +++++++++++++++++++++++++++++++++++++++++++
 newbinding/gen.py     |  8 ++++++++
 2 files changed, 54 insertions(+)

diff --git a/newbinding/binding.py b/newbinding/binding.py
index 1230813..fa9ce90 100644
--- a/newbinding/binding.py
+++ b/newbinding/binding.py
@@ -222,6 +222,50 @@ class Wrapper(object):
         println('if (!%(out)s) return NULL;' % locals())
         return out
 
+class Enum(Binding):
+    def __init__(self, ns, *values):
+        super(Enum, self).__init__()
+        self.values = values
+        self.ns = ns
+        self.name = None
+
+    def compile(self, name, println):
+        self.name = self.name or name
+
+    @property
+    def fullname(self):
+        return '::'.join([self.ns, self.name])
+
+class ClassEnum(Enum):
+    def __init__(self, cls, *values):
+        super(ClassEnum, self).__init__(None, *values)
+        self.cls = cls
+        self.cls.enums.append(self)
+
+    def compile(self, name, println):
+        self.ns = self.cls.fullname
+        super(ClassEnum, self).compile(name, println)
+
+    def wrap(self, println, var):
+        println2 = indent_println(println)
+        ret = declare(println, 'PyObject*', NULL)
+        println('switch(%s) { ' % var)
+        for v in self.values:
+            println('case %s::%s:' % (self.ns, v))
+            println2('%(ret)s = PyString_FromString("%(v)s");' % locals())
+            println2('break;')
+        else:
+            println('default:')
+            println2('PyErr_SetString(PyExc_TypeError, "Invalid enum: %s");' %
+                     v)
+            println2('return NULL;')
+        println('}')
+        return ret
+
+    def unwrap(self, println, var):
+        pass
+
+
 class Class(Binding):
     def __init__(self, ns):
         super(Class, self).__init__()
@@ -229,6 +273,8 @@ class Class(Binding):
         self.Ref = Ref(self)
         self.Pointer = Pointer(self)
         self.Subclass = lambda: Subclass(self)
+        self.Enum = lambda *v: ClassEnum(self, *v)
+        self.enums = []
         self.ns = ns
         self.methods = []
         self.name = None
diff --git a/newbinding/gen.py b/newbinding/gen.py
index c2126ab..87c0697 100644
--- a/newbinding/gen.py
+++ b/newbinding/gen.py
@@ -115,6 +115,14 @@ class Context(object):
             println('pass')
         else:
             mod = cls.name
+            # generate class enums
+            for enum in cls.enums:
+                println('class %s:' % enum.name)
+                println2 = indent_println(println)
+                for v in enum.values:
+                    println2('%(v)s = "%(v)s"' % locals())
+                println('')
+            # generate class methods
             for method in cls.methods:
                 name = method.name
                 if isinstance(method, StaticMethod):