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60 lines
2.2 KiB
Python
60 lines
2.2 KiB
Python
# Copyright (c) 2020 Rocky Bernstein
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def tryexcept(self, lhs, n, rule, ast, tokens, first, last):
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come_from_except = ast[-1]
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if rule == (
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"try_except",
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(
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"SETUP_EXCEPT",
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"suite_stmts_opt",
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"POP_BLOCK",
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"except_handler",
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"opt_come_from_except",
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),
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):
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if come_from_except[0] == "COME_FROM":
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# There should be at last two COME_FROMs, one from an
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# exception handler and one from the try. Otherwise
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# we have a try/else.
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return True
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pass
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elif rule == (
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'try_except',
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(
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'SETUP_EXCEPT',
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'suite_stmts_opt',
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'POP_BLOCK',
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'except_handler',
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'\\e_opt_come_from_except'
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),
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):
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# Find END_FINALLY.
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for i in range(last, first, -1):
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if tokens[i] == "END_FINALLY":
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jump_before_finally = tokens[i-1]
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if jump_before_finally.kind.startswith("JUMP"):
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if jump_before_finally == "JUMP_FORWARD":
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# If there is a JUMP_FORWARD before
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# the END_FINALLY to some jumps place
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# beyond tokens[last].off2int() then
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# this is a try/else rather than an
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# try (no else).
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return tokens[i-1].attr > tokens[last].off2int(prefer_last=True)
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elif jump_before_finally == "JUMP_BACK":
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# If there is a JUMP_BACK before the
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# END_FINALLY then this is a looping
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# jump, but then jumps in the except
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# handlers have to also be a looping
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# jump or this is a try/else rather
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# than an try (no else).
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except_handler = ast[3]
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if (except_handler == "except_handler" and
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except_handler[0] == "JUMP_FORWARD"):
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return True
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return False
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pass
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pass
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pass
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return False
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