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expr: check prefix operation

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This commit is contained in:
Zhuoxun Yang 2023-11-21 22:05:41 +08:00
parent a0ac3dd229
commit 17d21d2d9c
1 changed files with 6 additions and 2 deletions
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8
src/uu/expr/src/syntax_tree.rs
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@ -332,8 +332,12 @@ fn push_token_to_either_stack(
} }
Token::PrefixOp { .. } | Token::ParOpen => { Token::PrefixOp { .. } | Token::ParOpen => {
op_stack.push((token_idx, token.clone())); if out_stack.is_empty() {
Ok(()) op_stack.push((token_idx, token.clone()));
Ok(())
} else {
Err(String::from("syntax error (operation should be prefix)"))
}
} }
Token::ParClose => move_till_match_paren(out_stack, op_stack), Token::ParClose => move_till_match_paren(out_stack, op_stack),