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Sun, 14 Feb 2021 17:07:34 -0800 (PST) MIME-Version: 1.0 References: <20210213083521.kv3y3qzfnaffflfh@chazelas.org> <20210215003628.GC2302738@zira.vinc17.org> In-Reply-To: <20210215003628.GC2302738@zira.vinc17.org> From: Bart Schaefer Date: Sun, 14 Feb 2021 17:07:23 -0800 Message-ID: Subject: Re: Block comments ala Ray To: "zsh-workers@zsh.org" Content-Type: text/plain; charset="UTF-8" X-Seq: 48051 Archived-At: X-Loop: zsh-workers@zsh.org Errors-To: zsh-workers-owner@zsh.org Precedence: list Precedence: bulk Sender: zsh-workers-request@zsh.org X-no-archive: yes List-Id: List-Help: List-Subscribe: List-Unsubscribe: List-Post: List-Owner: List-Archive: Archived-At: On Sun, Feb 14, 2021 at 4:36 PM Vincent Lefevre wrote: > > How about the "'' " prefix (two single quotes followed by a space) Not very visually distinctive, especially for two single quotes then space then newline. Also as I mentioned, it's significantly more work if the introducer is more than two characters, because of the need to back up and re-lex if it turns out not to be a comment. It's easy to peek one character ahead of "!" and unget the peek if it isn't "#". To use more than two characters means turning the whole thing into a real lexical token rather than just something thrown away during lexing (as happens with comments at present). Hm, what about paren then ampersand? Doesn't conflict with ksh pattern-list syntax, is currently a syntax error, etc. The problem being that the reverse (ampersand paren) could appear in valid code, so the end marker would have to be asymmetric to remove that objection.