Skip to content

[lex.comment] Add a note that comments are replaced by a single space #8414

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
AlisdairM wants to merge 1 commit into from
Closed

[lex.comment] Add a note that comments are replaced by a single space #8414

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
6 changes: 6 additions & 0 deletions source/lex.tex
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -525,6 +525,12 @@
characters \tcode{//} and \tcode{/*} have no special meaning within a
\tcode{/*} comment.
\end{note}
\begin{note}
Comments are turned into \unicode{0020}{space} characters in
phase 3 of translation as part of decomposing a source file into
preprocessing tokens and sequences of whitespace characters.
Comment on lines +529 to +531

@jensmaurer jensmaurer Nov 5, 2025

Copy link
Copy Markdown
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

lex.phases p3 says a bit much in that location.

Maybe it's better to move the normative provision "Each comment (5.4) is replaced by one u+0020 space character." here or into lex.pptoken, possibly as part of the "whitespace grammar" paper.

@AlisdairM AlisdairM Dec 6, 2025

Copy link
Copy Markdown
Contributor Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

I was reluctant to touch the phases of translation more than necessary in P3657, the whitespace grammar paper. However, if we prefer that direction I will updated the next revision of that paper and close this PR.

\end{note}

\indextext{comment|)}

\rSec1[lex.pptoken]{Preprocessing tokens}
Expand Down