Merged revisions 61724-61725 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

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  r61724 | martin.v.loewis | 2008-03-22 01:01:12 +0100 (Sa, 22 Mär 2008) | 49 lines

  Merged revisions 61602-61723 via svnmerge from
  svn+ssh://pythondev@svn.python.org/sandbox/trunk/2to3/lib2to3

  ........
    r61626 | david.wolever | 2008-03-19 17:19:16 +0100 (Mi, 19 Mär 2008) | 1 line

    Added fixer for implicit local imports.  See #2414.
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    r61628 | david.wolever | 2008-03-19 17:57:43 +0100 (Mi, 19 Mär 2008) | 1 line

    Added a class for tests which should not run if a particular import is found.
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    r61629 | collin.winter | 2008-03-19 17:58:19 +0100 (Mi, 19 Mär 2008) | 1 line

    Two more relative import fixes in pgen2.
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    r61635 | david.wolever | 2008-03-19 20:16:03 +0100 (Mi, 19 Mär 2008) | 1 line

    Fixed print fixer so it will do the Right Thing when it encounters __future__.print_function.  2to3 gets upset, though, so the tests have been commented out.
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    r61637 | david.wolever | 2008-03-19 21:37:17 +0100 (Mi, 19 Mär 2008) | 3 lines

    Added a fixer for itertools imports (from itertools import imap, ifilterfalse --> from itertools import filterfalse)
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    r61645 | david.wolever | 2008-03-19 23:22:35 +0100 (Mi, 19 Mär 2008) | 1 line

    SVN is happier when you add the files you create... -_-'
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    r61654 | david.wolever | 2008-03-20 01:09:56 +0100 (Do, 20 Mär 2008) | 1 line

    Added an explicit sort order to fixers -- fixes problems like #2427
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    r61664 | david.wolever | 2008-03-20 04:32:40 +0100 (Do, 20 Mär 2008) | 3 lines

    Fixes #2428 -- comments are no longer eatten by __future__ fixer.
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    r61673 | david.wolever | 2008-03-20 17:22:40 +0100 (Do, 20 Mär 2008) | 1 line

    Added 2to3 node pretty-printer
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    r61679 | david.wolever | 2008-03-20 20:50:42 +0100 (Do, 20 Mär 2008) | 1 line

    Made node printing a little bit prettier
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    r61723 | martin.v.loewis | 2008-03-22 00:59:27 +0100 (Sa, 22 Mär 2008) | 2 lines

    Fix whitespace.
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  r61725 | martin.v.loewis | 2008-03-22 01:02:41 +0100 (Sa, 22 Mär 2008) | 2 lines

  Install lib2to3.
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Lib/lib2to3/fixes/fix_import.py

@@ -0,0 +1,55 @@
+"""Fixer for import statements.
+If spam is being imported from the local directory, this import:
+    from spam import eggs
+Becomes:
+    from .spam import eggs
+
+And this import:
+    import spam
+Becomes:
+    import .spam
+"""
+
+# Local imports
+from . import basefix
+from os.path import dirname, join, exists, pathsep
+
+class FixImport(basefix.BaseFix):
+
+    PATTERN = """
+    import_from< 'from' imp=any 'import' any >
+    |
+    import_name< 'import' imp=any >
+    """
+
+    def transform(self, node, results):
+        imp = results['imp']
+
+        if unicode(imp).startswith('.'):
+            # Already a new-style import
+            return
+
+        if not probably_a_local_import(unicode(imp), self.filename):
+            # I guess this is a global import -- skip it!
+            return
+
+        # Some imps are top-level (eg: 'import ham')
+        # some are first level (eg: 'import ham.eggs')
+        # some are third level (eg: 'import ham.eggs as spam')
+        # Hence, the loop
+        while not hasattr(imp, 'value'):
+            imp = imp.children[0]
+
+        imp.value = "." + imp.value
+        node.changed()
+        return node
+
+def probably_a_local_import(imp_name, file_path):
+    # Must be stripped because the right space is included by the parser
+    imp_name = imp_name.split('.', 1)[0].strip()
+    base_path = dirname(file_path)
+    base_path = join(base_path, imp_name)
+    for ext in ['.py', pathsep, '.pyc', '.so', '.sl', '.pyd']:
+        if exists(base_path + ext):
+            return True
+    return False