Skip to content

document the (split) PEG special #241

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

Merged
merged 1 commit into from
Jan 16, 2025
Merged

document the (split) PEG special #241

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
12 changes: 11 additions & 1 deletion content/docs/peg.mdz
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -218,7 +218,17 @@ compiled to bytecode).
@code`patt` cannot match more than @code`window-patt`; it will
see end-of-input at the end of the substring matched by
@code`window-patt`. If @code`patt` also succeeds, @code`sub` will
advance to the end of what @code`window-patt` matched. }}}
advance to the end of what @code`window-patt` matched. }}

@tr{@td{@code`(split separator-patt patt)` }
@td{ Split the remaining input by @code`separator-patt`, and execute
@code`patt` on each substring. @code`patt` will execute with its
input constrained to the next instance of @code`separator-patt`,
as if narrowed by @code`(sub (to separator-patt) ...)`.
@code`split` will continue to match separators and patterns until
it reaches the end of the input; if you don't want to match to the
end of the input you should first narrow it with
@code`(sub ... (split ...))`. }}}

PEGs try to match an input text with a pattern in a greedy manner. This means
that if a rule fails to match, that rule will fail and not try again. The only
Expand Down
Loading