diff env/lib/python3.7/site-packages/libfuturize/fixes/fix_raise.py @ 5:9b1c78e6ba9c draft default tip

"planemo upload commit 6c0a8142489327ece472c84e558c47da711a9142"
author shellac
date Mon, 01 Jun 2020 08:59:25 -0400
parents 79f47841a781
children
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--- a/env/lib/python3.7/site-packages/libfuturize/fixes/fix_raise.py	Thu May 14 16:47:39 2020 -0400
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,107 +0,0 @@
-"""Fixer for 'raise E, V'
-
-From Armin Ronacher's ``python-modernize``.
-
-raise         -> raise
-raise E       -> raise E
-raise E, 5    -> raise E(5)
-raise E, 5, T -> raise E(5).with_traceback(T)
-raise E, None, T -> raise E.with_traceback(T)
-
-raise (((E, E'), E''), E'''), 5 -> raise E(5)
-raise "foo", V, T               -> warns about string exceptions
-
-raise E, (V1, V2) -> raise E(V1, V2)
-raise E, (V1, V2), T -> raise E(V1, V2).with_traceback(T)
-
-
-CAVEATS:
-1) "raise E, V, T" cannot be translated safely in general. If V
-   is not a tuple or a (number, string, None) literal, then:
-
-   raise E, V, T -> from future.utils import raise_
-                    raise_(E, V, T)
-"""
-# Author: Collin Winter, Armin Ronacher, Mark Huang
-
-# Local imports
-from lib2to3 import pytree, fixer_base
-from lib2to3.pgen2 import token
-from lib2to3.fixer_util import Name, Call, is_tuple, Comma, Attr, ArgList
-
-from libfuturize.fixer_util import touch_import_top
-
-
-class FixRaise(fixer_base.BaseFix):
-
-    BM_compatible = True
-    PATTERN = """
-    raise_stmt< 'raise' exc=any [',' val=any [',' tb=any]] >
-    """
-
-    def transform(self, node, results):
-        syms = self.syms
-
-        exc = results["exc"].clone()
-        if exc.type == token.STRING:
-            msg = "Python 3 does not support string exceptions"
-            self.cannot_convert(node, msg)
-            return
-
-        # Python 2 supports
-        #  raise ((((E1, E2), E3), E4), E5), V
-        # as a synonym for
-        #  raise E1, V
-        # Since Python 3 will not support this, we recurse down any tuple
-        # literals, always taking the first element.
-        if is_tuple(exc):
-            while is_tuple(exc):
-                # exc.children[1:-1] is the unparenthesized tuple
-                # exc.children[1].children[0] is the first element of the tuple
-                exc = exc.children[1].children[0].clone()
-            exc.prefix = u" "
-
-        if "tb" in results:
-            tb = results["tb"].clone()
-        else:
-            tb = None
-
-        if "val" in results:
-            val = results["val"].clone()
-            if is_tuple(val):
-                # Assume that exc is a subclass of Exception and call exc(*val).
-                args = [c.clone() for c in val.children[1:-1]]
-                exc = Call(exc, args)
-            elif val.type in (token.NUMBER, token.STRING):
-                # Handle numeric and string literals specially, e.g.
-                # "raise Exception, 5" -> "raise Exception(5)".
-                val.prefix = u""
-                exc = Call(exc, [val])
-            elif val.type == token.NAME and val.value == u"None":
-                # Handle None specially, e.g.
-                # "raise Exception, None" -> "raise Exception".
-                pass
-            else:
-                # val is some other expression. If val evaluates to an instance
-                # of exc, it should just be raised. If val evaluates to None,
-                # a default instance of exc should be raised (as above). If val
-                # evaluates to a tuple, exc(*val) should be called (as
-                # above). Otherwise, exc(val) should be called. We can only
-                # tell what to do at runtime, so defer to future.utils.raise_(),
-                # which handles all of these cases.
-                touch_import_top(u"future.utils", u"raise_", node)
-                exc.prefix = u""
-                args = [exc, Comma(), val]
-                if tb is not None:
-                    args += [Comma(), tb]
-                return Call(Name(u"raise_"), args)
-
-        if tb is not None:
-            tb.prefix = ""
-            exc_list = Attr(exc, Name('with_traceback')) + [ArgList([tb])]
-        else:
-            exc_list = [exc]
-
-        return pytree.Node(syms.raise_stmt,
-                           [Name(u"raise")] + exc_list,
-                           prefix=node.prefix)