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27 lines
593 B
Racket
27 lines
593 B
Racket
#lang brag
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txtadv-program : verb-section everywhere-section things-section places-section start-section
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verb-section : <"===VERBS==="> verb-item+
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<verb-item> : verb-name+ s-exp
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<verb-name> : [<",">] ID ["_"]
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everywhere-section : <"===EVERYWHERE==="> id-desc+
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things-section : <"===THINGS==="> thing-item+
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<thing-item> : DASHED-NAME id-desc+
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places-section : <"===PLACES==="> place-item+
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<place-item> : DASHED-NAME STRING place-items id-desc+
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<place-items> : <"["> ([<",">] ID)* <"]">
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start-section : <"===START==="> ID
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<id-desc> : ID s-exp
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s-exp : ID | STRING | <"("> s-exp* <")"> |