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Edit File : fix_except.py \| Size : 3.27 KB
"""Fixer for except statements with named exceptions. The following cases will be converted: - "except E, T:" where T is a name: except E as T: - "except E, T:" where T is not a name, tuple or list: except E as t: T = t This is done because the target of an "except" clause must be a name. - "except E, T:" where T is a tuple or list literal: except E as t: T = t.args """ # Author: Collin Winter # Local imports from .. import pytree from ..pgen2 import token from .. import fixer_base from ..fixer_util import Assign, Attr, Name, is_tuple, is_list, syms def find_excepts(nodes): for i, n in enumerate(nodes): if n.type == syms.except_clause: if n.children[0].value == u'except': yield (n, nodes[i+2]) class FixExcept(fixer_base.BaseFix): BM_compatible = True PATTERN = """ try_stmt< 'try' ':' (simple_stmt \| suite) cleanup=(except_clause ':' (simple_stmt \| suite))+ tail=(['except' ':' (simple_stmt \| suite)] ['else' ':' (simple_stmt \| suite)] ['finally' ':' (simple_stmt \| suite)]) > """ def transform(self, node, results): syms = self.syms tail = [n.clone() for n in results["tail"]] try_cleanup = [ch.clone() for ch in results["cleanup"]] for except_clause, e_suite in find_excepts(try_cleanup): if len(except_clause.children) == 4: (E, comma, N) = except_clause.children[1:4] comma.replace(Name(u"as", prefix=u" ")) if N.type != token.NAME: # Generate a new N for the except clause new_N = Name(self.new_name(), prefix=u" ") target = N.clone() target.prefix = u"" N.replace(new_N) new_N = new_N.clone() # Insert "old_N = new_N" as the first statement in # the except body. This loop skips leading whitespace # and indents #TODO(cwinter) suite-cleanup suite_stmts = e_suite.children for i, stmt in enumerate(suite_stmts): if isinstance(stmt, pytree.Node): break # The assignment is different if old_N is a tuple or list # In that case, the assignment is old_N = new_N.args if is_tuple(N) or is_list(N): assign = Assign(target, Attr(new_N, Name(u'args'))) else: assign = Assign(target, new_N) #TODO(cwinter) stopgap until children becomes a smart list for child in reversed(suite_stmts[:i]): e_suite.insert_child(0, child) e_suite.insert_child(i, assign) elif N.prefix == u"": # No space after a comma is legal; no space after "as", # not so much. N.prefix = u" " #TODO(cwinter) fix this when children becomes a smart list children = [c.clone() for c in node.children[:3]] + try_cleanup + tail return pytree.Node(node.type, children) Back

Edit File : fix_except.py | Size : 3.27 KB

"""Fixer for except statements with named exceptions.

The following cases will be converted:

- "except E, T:" where T is a name:

except E as T:

- "except E, T:" where T is not a name, tuple or list:

except E as t:
            T = t

This is done because the target of an "except" clause must be a
    name.

- "except E, T:" where T is a tuple or list literal:

except E as t:
            T = t.args
"""
# Author: Collin Winter

# Local imports
from .. import pytree
from ..pgen2 import token
from .. import fixer_base
from ..fixer_util import Assign, Attr, Name, is_tuple, is_list, syms

def find_excepts(nodes):
    for i, n in enumerate(nodes):
        if n.type == syms.except_clause:
            if n.children[0].value == u'except':
                yield (n, nodes[i+2])

class FixExcept(fixer_base.BaseFix):
    BM_compatible = True

PATTERN = """
    try_stmt< 'try' ':' (simple_stmt | suite)
                  cleanup=(except_clause ':' (simple_stmt | suite))+
                  tail=(['except' ':' (simple_stmt | suite)]
                        ['else' ':' (simple_stmt | suite)]
                        ['finally' ':' (simple_stmt | suite)]) >
    """

def transform(self, node, results):
        syms = self.syms

tail = [n.clone() for n in results["tail"]]

try_cleanup = [ch.clone() for ch in results["cleanup"]]
        for except_clause, e_suite in find_excepts(try_cleanup):
            if len(except_clause.children) == 4:
                (E, comma, N) = except_clause.children[1:4]
                comma.replace(Name(u"as", prefix=u" "))

if N.type != token.NAME:
                    # Generate a new N for the except clause
                    new_N = Name(self.new_name(), prefix=u" ")
                    target = N.clone()
                    target.prefix = u""
                    N.replace(new_N)
                    new_N = new_N.clone()

# Insert "old_N = new_N" as the first statement in
                    #  the except body. This loop skips leading whitespace
                    #  and indents
                    #TODO(cwinter) suite-cleanup
                    suite_stmts = e_suite.children
                    for i, stmt in enumerate(suite_stmts):
                        if isinstance(stmt, pytree.Node):
                            break

# The assignment is different if old_N is a tuple or list
                    # In that case, the assignment is old_N = new_N.args
                    if is_tuple(N) or is_list(N):
                        assign = Assign(target, Attr(new_N, Name(u'args')))
                    else:
                        assign = Assign(target, new_N)

#TODO(cwinter) stopgap until children becomes a smart list
                    for child in reversed(suite_stmts[:i]):
                        e_suite.insert_child(0, child)
                    e_suite.insert_child(i, assign)
                elif N.prefix == u"":
                    # No space after a comma is legal; no space after "as",
                    # not so much.
                    N.prefix = u" "

#TODO(cwinter) fix this when children becomes a smart list
        children = [c.clone() for c in node.children[:3]] + try_cleanup + tail
        return pytree.Node(node.type, children)

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