xhs-note-crawling/python/py/Lib/site-packages/decompyle3/parsers/reduce_check/c_tryelsestmt.py

#  Copyright (c) 2020 Rocky Bernstein
#  This program is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation, either version 3 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program.  If not, see <http://www.gnu.org/licenses/>.

from decompyle3.parsers.treenode import SyntaxTree


def c_tryelsestmt(self, lhs, n, rule, ast, tokens, first, last):
    # Check the end of the except handler that there isn't a jump from
    # inside the except handler to the end. If that happens
    # then this is a "try" with no "else".
    except_handler = ast[3]

    # print("XXX", first, last, rule)
    # for t in range(first, last): print(tokens[t])
    # print("="*40)

    if except_handler == "except_handler_else":
        except_handler = except_handler[0]

    come_from = except_handler[-1]
    # We only care about the *first* come_from because that is the
    # the innermost one. So if the "tryelse" is invalid (should be a "try")
    # it will be invalid here.
    if come_from == "COME_FROM":
        first_come_from = except_handler[-1]
    elif come_from == "END_FINALLY":
        first_come_from = None
    elif come_from == "except_return":
        return False
    else:
        assert come_from in ("come_froms", "opt_come_from_except")
        first_come_from = come_from[0]
        if not hasattr(first_come_from, "attr"):
            # optional come from
            return False

    leading_jump = except_handler[0]

    # We really don't care that this is a jump per-se. But
    # we could also check that this jumps to the end of the except if
    # desired.
    if isinstance(leading_jump, SyntaxTree):
        leading_jump = leading_jump.first_child()

    # If there is a jump in the except that goes to the same place as
    # except_handler_first_offset, then this is a "try" without an else.
    except_stmt = except_handler[2]
    if except_stmt in ("c_except_stmts", "except_stmts"):
        first_except = except_stmt[0]
        first_except_offset = first_except.first_child().off2int(prefer_last=False)
        i = self.offset2inst_index[first_except_offset]
        else_offset = leading_jump.attr
        inst = self.insts[i]
        while inst.offset < else_offset:
            if inst.is_jump() and inst.argval == else_offset:
                return True
            i += 1
            inst = self.insts[i]
            pass
        pass

    return False