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42 lines
1.6 KiB
Python
42 lines
1.6 KiB
Python
# Copyright (c) 2022 Rocky Bernstein
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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def whilestmt38_check(
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self, lhs: str, n: int, rule, ast, tokens: list, first: int, last: int
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) -> bool:
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# When we are missing a COME_FROM_LOOP, the
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# "while" statement is nested inside an if/else
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# so after the POP_BLOCK we have a JUMP_FORWARD which forms the "else" portion of the "if"
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# Check this.
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# print("XXX", first, last, rule)
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# for t in range(first, last):
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# print(tokens[t])
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# print("=" * 40)
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if tokens[last] != "COME_FROM" and tokens[last - 1] == "COME_FROM":
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last -= 1
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if tokens[last - 1].kind.startswith("RAISE_VARARGS"):
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return True
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while tokens[last] == "COME_FROM":
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last -= 1
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# In a "while" loop, (in contrast to "for" loop), the loop jump is
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# always to the first offset
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first_offset = tokens[first].off2int()
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if tokens[last] == "JUMP_LOOP" and (
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tokens[last].attr == first_offset or tokens[last - 1].attr == first_offset
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):
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return False
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return True
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