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Matthew Butterick 2016-09-26 06:55:58 -07:00
parent 7712ab31d4
commit c5cf417b99
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@ -56,7 +56,7 @@ nested-word-list: WORD
| LEFT-PAREN nested-word-list* RIGHT-PAREN | LEFT-PAREN nested-word-list* RIGHT-PAREN
}} }}
What we intend by this notation is this: @racket[nested-word-list] is either a @racket[WORD], or a parenthesized list of @racket[nested-word-list]s. We use the character @litchar{*} to represent zero or more repetitions of the previous thing. We treat the uppercased @racket[LEFT-PAREN], @racket[RIGHT-PAREN], and @racket[WORD] as placeholders for @emph{tokens} (a @deftech{token} being the smallest meaningful item in the parsed string): What we intend by this notation is this: @racket[nested-word-list] is either a @racket[WORD], or a parenthesized list of @racket[nested-word-list]s. We use the character @litchar{*} to represent zero or more repetitions of the previous thing. We treat the uppercased @racket[LEFT-PAREN], @racket[RIGHT-PAREN], and @racket[WORD] as placeholders for @emph{tokens} (a @tech{token} being the smallest meaningful item in the parsed string):
Here are a few examples of tokens: Here are a few examples of tokens:
@interaction[#:eval my-eval @interaction[#:eval my-eval