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expr: check prefix operation
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1 changed files with 6 additions and 2 deletions
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@ -332,8 +332,12 @@ fn push_token_to_either_stack(
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}
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Token::PrefixOp { .. } | Token::ParOpen => {
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if out_stack.is_empty() {
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op_stack.push((token_idx, token.clone()));
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Ok(())
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} else {
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Err(String::from("syntax error (operation should be prefix)"))
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}
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}
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Token::ParClose => move_till_match_paren(out_stack, op_stack),
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