Scanner

Whether the scanner has reached its limit.

Consumes one character.

Runs block, keeping what it consumed when it returns a value and rewinding when it returns null.

Runs block and always rewinds, so the scanner only looks and never consumes.

Reads the neighbouring character even when it lies before the slice's own start, which is what a boundary rule needs.

Repeats block as a step while it succeeds, so a failed iteration consumes nothing. An iteration that succeeds without consuming anything ends the loop and is not counted, because repeating it could never terminate.

Runs block, keeping what it consumed when it returns true and rewinding when it returns false.

Consumes a backtick-delimited span, which a label treats as opaque.

Consumes a {#identifier} suffix.

Consumes a title enclosed in double quotes, single quotes or parentheses. A backslash escapes the next character, and the closing delimiter may not appear unescaped inside. The title may span lines, but not a blank one, since the construct it belongs to ends where a paragraph does.

Consumes a backslash and the character it escapes, which may not be a line terminator.

Consumes the bracketed label shared by links, reference links, images and reference images.

Consumes a parenthesized destination with its optional title.

Consumes a one-line math expression. It opens with a dollar sign and one space or tab and closes with one space or tab and a dollar sign; an inner dollar sign belongs to the expression as long as it is not adjacent to whitespace.

Consumes everything up to the limit.

Consumes every character satisfying predicate.