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annotate planemo/lib/python3.7/site-packages/libfuturize/fixes/fix_raise.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1 """Fixer for 'raise E, V'
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2
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3 From Armin Ronacher's ``python-modernize``.
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4
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5 raise -> raise
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6 raise E -> raise E
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7 raise E, 5 -> raise E(5)
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8 raise E, 5, T -> raise E(5).with_traceback(T)
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9 raise E, None, T -> raise E.with_traceback(T)
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10
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11 raise (((E, E'), E''), E'''), 5 -> raise E(5)
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12 raise "foo", V, T -> warns about string exceptions
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13
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14 raise E, (V1, V2) -> raise E(V1, V2)
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15 raise E, (V1, V2), T -> raise E(V1, V2).with_traceback(T)
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16
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17
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18 CAVEATS:
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19 1) "raise E, V, T" cannot be translated safely in general. If V
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20 is not a tuple or a (number, string, None) literal, then:
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21
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22 raise E, V, T -> from future.utils import raise_
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23 raise_(E, V, T)
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24 """
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25 # Author: Collin Winter, Armin Ronacher, Mark Huang
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26
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27 # Local imports
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28 from lib2to3 import pytree, fixer_base
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29 from lib2to3.pgen2 import token
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30 from lib2to3.fixer_util import Name, Call, is_tuple, Comma, Attr, ArgList
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31
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32 from libfuturize.fixer_util import touch_import_top
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33
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34
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35 class FixRaise(fixer_base.BaseFix):
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36
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37 BM_compatible = True
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38 PATTERN = """
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39 raise_stmt< 'raise' exc=any [',' val=any [',' tb=any]] >
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40 """
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41
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42 def transform(self, node, results):
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43 syms = self.syms
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44
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45 exc = results["exc"].clone()
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46 if exc.type == token.STRING:
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47 msg = "Python 3 does not support string exceptions"
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48 self.cannot_convert(node, msg)
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49 return
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50
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51 # Python 2 supports
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52 # raise ((((E1, E2), E3), E4), E5), V
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53 # as a synonym for
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54 # raise E1, V
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55 # Since Python 3 will not support this, we recurse down any tuple
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56 # literals, always taking the first element.
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57 if is_tuple(exc):
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58 while is_tuple(exc):
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59 # exc.children[1:-1] is the unparenthesized tuple
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60 # exc.children[1].children[0] is the first element of the tuple
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61 exc = exc.children[1].children[0].clone()
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62 exc.prefix = u" "
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63
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64 if "tb" in results:
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65 tb = results["tb"].clone()
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66 else:
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67 tb = None
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68
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69 if "val" in results:
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70 val = results["val"].clone()
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71 if is_tuple(val):
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72 # Assume that exc is a subclass of Exception and call exc(*val).
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73 args = [c.clone() for c in val.children[1:-1]]
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74 exc = Call(exc, args)
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75 elif val.type in (token.NUMBER, token.STRING):
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76 # Handle numeric and string literals specially, e.g.
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77 # "raise Exception, 5" -> "raise Exception(5)".
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78 val.prefix = u""
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79 exc = Call(exc, [val])
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80 elif val.type == token.NAME and val.value == u"None":
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81 # Handle None specially, e.g.
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82 # "raise Exception, None" -> "raise Exception".
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83 pass
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84 else:
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85 # val is some other expression. If val evaluates to an instance
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86 # of exc, it should just be raised. If val evaluates to None,
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87 # a default instance of exc should be raised (as above). If val
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88 # evaluates to a tuple, exc(*val) should be called (as
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89 # above). Otherwise, exc(val) should be called. We can only
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90 # tell what to do at runtime, so defer to future.utils.raise_(),
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91 # which handles all of these cases.
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92 touch_import_top(u"future.utils", u"raise_", node)
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93 exc.prefix = u""
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94 args = [exc, Comma(), val]
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95 if tb is not None:
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96 args += [Comma(), tb]
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97 return Call(Name(u"raise_"), args)
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98
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99 if tb is not None:
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100 tb.prefix = ""
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101 exc_list = Attr(exc, Name('with_traceback')) + [ArgList([tb])]
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102 else:
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103 exc_list = [exc]
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104
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105 return pytree.Node(syms.raise_stmt,
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106 [Name(u"raise")] + exc_list,
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107 prefix=node.prefix)