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This commit is contained in:
Matthew Butterick 2016-05-10 16:50:50 -07:00
parent 61890e18ee
commit 17d9f17f4e
1 changed files with 14 additions and 7 deletions
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21
beautiful-racket/br/demo/txtadv/parser.rkt
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@ -2,14 +2,23 @@
txtadv-program : verb-section everywhere-section things-section places-section start-section
;; hide on right side: remove element
;; useful for: getting rid of literals
;; splice on right side: lift element
;; useful for: selective splicing
;; hide on left side: remove name, leave container
;; useful for: grouping args, avoiding "alternation" pattern
;; splice on left side: lift everywhere
;; useful for: flattening recursive structures
verb-section : /"===VERBS===" verb-item+
/verb-item : verb next-verb* s-exp
/verb-item : verb-list s-exp
@verb-list : verb [/"," verb-list]
/verb : ID ["_"]
@next-verb : [/","] verb
everywhere-section : /"===EVERYWHERE===" id-desc+
things-section : /"===THINGS===" thing-item+
@ -20,11 +29,9 @@ places-section : /"===PLACES===" place-item+
/place-item : DASHED-NAME STRING place-items id-desc+
/place-items : /"[" [place next-place*] /"]"
/place-items : /"[" [place-list] /"]"
@place : ID
@next-place: /"," place
@place-list : ID [/"," place-list]
start-section : /"===START===" ID