[clang.py] Implement __eq__ and __ne__ on SourceLocation and SourceRange

There is no type checking in __eq__, so ctypes will throw if the wrong
Python type is passed in to the C function. Personally, I feel garbage
in means garbage out and it isn't worth testing for this explicitly.

Contributed by: Gregory Szorc <gregory.szorc@gmail.com>

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@149824 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/bindings/python/clang/cindex.py b/bindings/python/clang/cindex.py
index 48a107c..474740a 100644
--- a/bindings/python/clang/cindex.py
+++ b/bindings/python/clang/cindex.py
@@ -146,6 +146,12 @@
         """Get the file offset represented by this source location."""
         return self._get_instantiation()[3]
 
+    def __eq__(self, other):
+        return SourceLocation_equalLocations(self, other)
+
+    def __ne__(self, other):
+        return not self.__eq__(other)
+
     def __repr__(self):
         if self.file:
             filename = self.file.name
@@ -186,6 +192,12 @@
         """
         return SourceRange_end(self)
 
+    def __eq__(self, other):
+        return SourceRange_equalRanges(self, other)
+
+    def __ne__(self, other):
+        return not self.__eq__(other)
+
     def __repr__(self):
         return "<SourceRange start %r, end %r>" % (self.start, self.end)
 
@@ -1613,6 +1625,10 @@
 SourceLocation_getLocation.argtypes = [TranslationUnit, File, c_uint, c_uint]
 SourceLocation_getLocation.restype = SourceLocation
 
+SourceLocation_equalLocations = lib.clang_equalLocations
+SourceLocation_equalLocations.argtypes = [SourceLocation, SourceLocation]
+SourceLocation_equalLocations.restype = bool
+
 # Source Range Functions
 SourceRange_getRange = lib.clang_getRange
 SourceRange_getRange.argtypes = [SourceLocation, SourceLocation]
@@ -1626,6 +1642,10 @@
 SourceRange_end.argtypes = [SourceRange]
 SourceRange_end.restype = SourceLocation
 
+SourceRange_equalRanges = lib.clang_equalRanges
+SourceRange_equalRanges.argtypes = [SourceRange, SourceRange]
+SourceRange_equalRanges.restype = bool
+
 # CursorKind Functions
 CursorKind_is_decl = lib.clang_isDeclaration
 CursorKind_is_decl.argtypes = [CursorKind]
diff --git a/bindings/python/tests/cindex/test_location.py b/bindings/python/tests/cindex/test_location.py
index 300136f..1707f01 100644
--- a/bindings/python/tests/cindex/test_location.py
+++ b/bindings/python/tests/cindex/test_location.py
@@ -1,4 +1,4 @@
-from clang.cindex import Index, File, SourceLocation, Cursor
+from clang.cindex import Index, File, SourceLocation, SourceRange, Cursor
 
 baseInput="int one;\nint two;\n"
 
@@ -47,6 +47,12 @@
         if n.spelling == 'one':
             assert n == cursor
 
+    # Ensure locations referring to the same entity are equivalent.
+    location2 = SourceLocation.from_position(tu, file, 1, 5)
+    assert location == location2
+    location3 = SourceLocation.from_position(tu, file, 1, 4)
+    assert location2 != location3
+
 def test_extent():
     index = Index.create()
     tu = index.parse('t.c', unsaved_files = [('t.c',baseInput)])
@@ -60,3 +66,15 @@
             assert_location(n.extent.start,line=2,column=1,offset=9)
             assert_location(n.extent.end,line=2,column=8,offset=16)
             assert baseInput[n.extent.start.offset:n.extent.end.offset] == "int two"
+
+    file = File.from_name(tu, 't.c')
+    location1 = SourceLocation.from_position(tu, file, 1, 1)
+    location2 = SourceLocation.from_position(tu, file, 1, 8)
+
+    range1 = SourceRange.from_locations(location1, location2)
+    range2 = SourceRange.from_locations(location1, location2)
+    assert range1 == range2
+
+    location3 = SourceLocation.from_position(tu, file, 1, 6)
+    range3 = SourceRange.from_locations(location1, location3)
+    assert range1 != range3