eerie poem grammar

poem_bnf.txt

<poem> ::= <rule1> "\n" <rule2> "\n" <rule3>
<qual> ::= "while" | "as" | "momentarily" | "frozen"
<noun> ::= "he" | "she" | "the shadowy figure" | "the boy" | "a child"
<tverb> ::= "outlines" | "casts toward" | "stares at" | "captures" | "damns"
<iverb> ::= "lingers" | "pauses" | "reflects" | "alights" | "hesitates" 
        | "turns away" | "returns" | "kneels" | "stares"
<article> ::= "a" | "the"
<adj> ::= "slowly" | "silently" | "darkly" | "with fear" 
        | "expectantly" | "fearfully"
<ger> ::= "waiting" | "pointing" | "breathing"
<onoun> ::= "sky" | "void" | "abyss" | "star" | "darkness" 
        | "lake" | "moon" | "cloud"
<clause> ::= "and" " " <iverb> | "but" " "  <iverb> | "and"  " "  <iverb> 
        | "while" " " <ger> " " <adj>
<object> ::= <article> " " <onoun>
<rule1> ::= <qual> " " <noun> " " <tverb> " " <object>
<rule2> ::= <noun> " " <iverb> " " <clause>
<rule3> ::= <qual> " " <noun> " " <iverb>

Grammar used as an "rsg" benchmark for the Icon programming language. From the brain of Ralph Griswold.