Update magic number.

Fix import support to work with import as variant of Python 2.0.  The
grammar for import changed, requiring changes in transformer and code
generator, even to handle compilation of imports with as.

Lib/compiler/pycodegen.py

@@ -1,6 +1,7 @@
 import os
 import marshal
 import stat
+import string
 import struct
 import types
 from cStringIO import StringIO
@@ -44,7 +45,7 @@ class Module:
         f.write(self.getPycHeader())
         marshal.dump(self.code, f)
 
-    MAGIC = (50811 | (ord('\r')<<16) | (ord('\n')<<24))
+    MAGIC = (50823 | (ord('\r')<<16) | (ord('\n')<<24))
 
     def getPycHeader(self):
         # compile.c uses marshal to write a long directly, with
@@ -420,19 +421,32 @@ class CodeGenerator:
 
     def visitImport(self, node):
         self.set_lineno(node)
-        for name in node.names:
+        for name, alias in node.names:
+            self.emit('LOAD_CONST', None)
             self.emit('IMPORT_NAME', name)
-            self.storeName(name)
+            self._resolveDots(name)
+            self.storeName(alias or name)
 
     def visitFrom(self, node):
         self.set_lineno(node)
+        fromlist = map(lambda (name, alias): name, node.names)
+        self.emit('LOAD_CONST', tuple(fromlist))
         self.emit('IMPORT_NAME', node.modname)
-        for name in node.names:
+        for name, alias in node.names:
             if name == '*':
                 self.namespace = 0
             self.emit('IMPORT_FROM', name)
+            self._resolveDots(name)
+            self.storeName(alias or name)
         self.emit('POP_TOP')
 
+    def _resolveDots(self, name):
+        elts = string.split(name, ".")
+        if len(elts) == 1:
+            return
+        for elt in elts[1:]:
+            self.emit('LOAD_ATTR', elt)
+
     def visitGetattr(self, node):
         self.visit(node.expr)
         self.emit('LOAD_ATTR', node.attrname)
@@ -787,12 +801,12 @@ class LocalNameFinder:
         pass
 
     def visitImport(self, node):
-        for name in node.names:
+        for name, alias in node.names:
-            self.names.add(name)
+            self.names.add(alias or name)
 
     def visitFrom(self, node):
-        for name in node.names:
+        for name, alias in node.names:
-            self.names.add(name)
+            self.names.add(alias or name)
 
     def visitClass(self, node):
         self.names.add(node.name)

Lib/compiler/transformer.py

@@ -402,19 +402,20 @@ class Transformer:
     return n
 
   def import_stmt(self, nodelist):
-    # import: dotted_name (',' dotted_name)* |
+    # import_stmt: 'import' dotted_as_name (',' dotted_as_name)* |
-    # from: dotted_name 'import' ('*' | NAME (',' NAME)*)
+    # from: 'from' dotted_name 'import'
-    names = [ ]
+    #                        ('*' | import_as_name (',' import_as_name)*)
-    if nodelist[0][1][0] == 'f':
+    names = []
+    is_as = 0
+    if nodelist[0][1] == 'from':
       for i in range(3, len(nodelist), 2):
-        # note: nodelist[i] could be (token.STAR, '*') or (token.NAME, name)
+        names.append(self.com_import_as_name(nodelist[i][1]))
-        names.append(nodelist[i][1])
       n = Node('from', self.com_dotted_name(nodelist[1]), names)
       n.lineno = nodelist[0][2]
       return n
 
     for i in range(1, len(nodelist), 2):
-      names.append(self.com_dotted_name(nodelist[i]))
+      names.append(self.com_dotted_as_name(nodelist[i]))
     n = Node('import', names)
     n.lineno = nodelist[0][2]
     return n
@@ -738,6 +739,7 @@ class Transformer:
     if node[0] not in _legal_node_types:
       raise error, 'illegal node passed to com_node: %s' % node[0]
 
+#    print "dispatch", self._dispatch[node[0]].__name__, node
     return self._dispatch[node[0]](node[1:])
 
   def com_arglist(self, nodelist):
@@ -814,6 +816,22 @@ class Transformer:
         name = name + n[1] + '.'
     return name[:-1]
 
+  def com_dotted_as_name(self, node):
+    dot = self.com_dotted_name(node[1])
+    if len(node) == 2:
+      return dot, None
+    assert node[2][1] == 'as'
+    assert node[3][0] == token.NAME
+    return dot, node[3][1]
+
+  def com_import_as_name(self, node):
+    if node[0] == token.NAME:
+      return node[1], None
+    assert len(node) == 4
+    assert node[2][1] == 'as'
+    assert node[3][0] == token.NAME
+    return node[1][1], node[3][1]
+
   def com_bases(self, node):
     bases = [ ]
     for i in range(1, len(node), 2):

Tools/compiler/compiler/pycodegen.py

@@ -1,6 +1,7 @@
 import os
 import marshal
 import stat
+import string
 import struct
 import types
 from cStringIO import StringIO
@@ -44,7 +45,7 @@ class Module:
         f.write(self.getPycHeader())
         marshal.dump(self.code, f)
 
-    MAGIC = (50811 | (ord('\r')<<16) | (ord('\n')<<24))
+    MAGIC = (50823 | (ord('\r')<<16) | (ord('\n')<<24))
 
     def getPycHeader(self):
         # compile.c uses marshal to write a long directly, with
@@ -420,19 +421,32 @@ class CodeGenerator:
 
     def visitImport(self, node):
         self.set_lineno(node)
-        for name in node.names:
+        for name, alias in node.names:
+            self.emit('LOAD_CONST', None)
             self.emit('IMPORT_NAME', name)
-            self.storeName(name)
+            self._resolveDots(name)
+            self.storeName(alias or name)
 
     def visitFrom(self, node):
         self.set_lineno(node)
+        fromlist = map(lambda (name, alias): name, node.names)
+        self.emit('LOAD_CONST', tuple(fromlist))
         self.emit('IMPORT_NAME', node.modname)
-        for name in node.names:
+        for name, alias in node.names:
             if name == '*':
                 self.namespace = 0
             self.emit('IMPORT_FROM', name)
+            self._resolveDots(name)
+            self.storeName(alias or name)
         self.emit('POP_TOP')
 
+    def _resolveDots(self, name):
+        elts = string.split(name, ".")
+        if len(elts) == 1:
+            return
+        for elt in elts[1:]:
+            self.emit('LOAD_ATTR', elt)
+
     def visitGetattr(self, node):
         self.visit(node.expr)
         self.emit('LOAD_ATTR', node.attrname)
@@ -787,12 +801,12 @@ class LocalNameFinder:
         pass
 
     def visitImport(self, node):
-        for name in node.names:
+        for name, alias in node.names:
-            self.names.add(name)
+            self.names.add(alias or name)
 
     def visitFrom(self, node):
-        for name in node.names:
+        for name, alias in node.names:
-            self.names.add(name)
+            self.names.add(alias or name)
 
     def visitClass(self, node):
         self.names.add(node.name)

Tools/compiler/compiler/transformer.py

@@ -402,19 +402,20 @@ class Transformer:
     return n
 
   def import_stmt(self, nodelist):
-    # import: dotted_name (',' dotted_name)* |
+    # import_stmt: 'import' dotted_as_name (',' dotted_as_name)* |
-    # from: dotted_name 'import' ('*' | NAME (',' NAME)*)
+    # from: 'from' dotted_name 'import'
-    names = [ ]
+    #                        ('*' | import_as_name (',' import_as_name)*)
-    if nodelist[0][1][0] == 'f':
+    names = []
+    is_as = 0
+    if nodelist[0][1] == 'from':
       for i in range(3, len(nodelist), 2):
-        # note: nodelist[i] could be (token.STAR, '*') or (token.NAME, name)
+        names.append(self.com_import_as_name(nodelist[i][1]))
-        names.append(nodelist[i][1])
       n = Node('from', self.com_dotted_name(nodelist[1]), names)
       n.lineno = nodelist[0][2]
       return n
 
     for i in range(1, len(nodelist), 2):
-      names.append(self.com_dotted_name(nodelist[i]))
+      names.append(self.com_dotted_as_name(nodelist[i]))
     n = Node('import', names)
     n.lineno = nodelist[0][2]
     return n
@@ -738,6 +739,7 @@ class Transformer:
     if node[0] not in _legal_node_types:
       raise error, 'illegal node passed to com_node: %s' % node[0]
 
+#    print "dispatch", self._dispatch[node[0]].__name__, node
     return self._dispatch[node[0]](node[1:])
 
   def com_arglist(self, nodelist):
@@ -814,6 +816,22 @@ class Transformer:
         name = name + n[1] + '.'
     return name[:-1]
 
+  def com_dotted_as_name(self, node):
+    dot = self.com_dotted_name(node[1])
+    if len(node) == 2:
+      return dot, None
+    assert node[2][1] == 'as'
+    assert node[3][0] == token.NAME
+    return dot, node[3][1]
+
+  def com_import_as_name(self, node):
+    if node[0] == token.NAME:
+      return node[1], None
+    assert len(node) == 4
+    assert node[2][1] == 'as'
+    assert node[3][0] == token.NAME
+    return node[1][1], node[3][1]
+
   def com_bases(self, node):
     bases = [ ]
     for i in range(1, len(node), 2):