kiril/Well-Parenthesized-Strings
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Kiril Kovachev 2025-03-07 16:28:30 +00:00
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@ -84,7 +84,7 @@ P ::= P()
| ε
```
...which, due to the first rule, was regrettably indeed left-recursive. That rule should be able to be fixed using the following adjustment, though:
`P() => P{()}+` (where `{}` denotes a grouping, and `()` still just denote parentheses. In PCRE regex syntax, this would be `(\(\))*`).
`P() → P{()}+` (where `{}` denotes a grouping, and `()` still just denote parentheses. In PCRE regex syntax, this would be `(\(\))*`).
Note that `S` is just the grammar for one line of parentheses, without the line-break character of end-of-file part of the specification taken into account.
The full grammar is: