Parsing words can consume input from the input stream. Words come in two flavors: words that throw upon finding end of file, and words that return f upon the same.

Parsing words that throw on end of file:

scan-token ( -- str )

scan-word-name ( -- string )

scan-word ( -- word )

scan-datum ( -- word/number )

scan-number ( -- number )

scan-object ( -- object )

Parsing words that return f on end of file:

?scan-token ( -- str/f )

?scan-datum ( -- word/number/f )

A simple example is the \ word: