70 lines
No EOL
2.2 KiB
Text
70 lines
No EOL
2.2 KiB
Text
// BNF of the command language used to interact with the LastMUD server.
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// Everything is defined in lower-case, but by default the syntax is case-insensitive
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command ::= move
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| look
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| take
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| drop
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| inspect
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| attack
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| use
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| autoAttack
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| speakGlobal
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| speakRegion
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| speakDirect
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| speakLocal
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speakGlobal ::= ( "g" | "gch" | "global" ) chatMessage ;
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speakRegion ::= ( "shout" | "yell" ) chatMessage ;
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speakDirect ::= ( "whisper" | "tell" ) identifier chatMessage ;
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speakLocal ::= "say" chatMessage ;
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// enable auto-attack on first creature within range in direction,
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// or on named creature with identifier
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autoAttack ::= ( "kill" | "autohit" | "engage" ) ( direction | identifier ) ;
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// single ( manual ) strike on first creature within range in direction,
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// or on named creature with identifier
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attack ::= ( "strike" | "hit" | "attack" ) ( direction | identifier ) ;
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use ::= ( "interact" | "use" ) ( direction | identifier | identifier "on" identifier ) ;
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// inspect self, inspect [Other Player], inspect [Enemy], inspect [Item on ground], inspect [Item in inventory]
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inspect ::= "inspect" ( "self" | identifier ) ;
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drop ::= "drop" identifier ;
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// take first thing in direction,
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// or take thing with identifier
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take ::= "take" ( direction | identifier+ );
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look ::= "look" [ "around" | direction | "at" identifier ] ;
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move ::= "move" direction | "go" direction ;
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// [Player Name], [Item Name], [Place Name] or just Player Name, Item Name, Place Name
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// brackets may be useful in situations where there are multiple identifiers
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identifier ::= "[" name "]" | name ;
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name ::= letter ( letter | digit )* ;
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decimal ::= number "." number ; // 1.0, 2.0, 132.183, etc.
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number ::= digit ( digit )* ; // 123, 12, 97401, etc.
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word ::= letter+;
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chatMessage ::= ( letter | digit | space )+ ;
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direction ::= "east" | "west" | "north" | "up" | "down" ;
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letter ::= "a" | "b" | "c" | "d" | "e" | "f" | "g" | "h" | "i" | "j"
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| "k" | "l" | "m" | "n" | "o" | "p" | "q" | "r" | "s" | "t"
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| "u" | "v" | "w" | "x" | "y" | "z" ;
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digit ::= "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" ;
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space ::= " " ; |