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35 lines
1.1 KiB
BNF
35 lines
1.1 KiB
BNF
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# This is a full BNF grammar for the task command line. It is intended that a
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# future release of task will incorporate a complete lexer/parser implementing
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# this grammar.
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command ::= simple_command
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| filter_command filter?
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| id_command
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| "export" file
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| <id>
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| <id> <substitution>
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simple_command ::= "version" | "help" | "projects" | "tags" | "next" | "stats"
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| "color" ;
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filter_command ::= "summary" | "history" | "calendar" | "active" | "overdue"
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| "oldest" | "newest" | "add" | "list" | "long" | "ls"
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| "completed" ;
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id_command ::= "delete" | "undelete" | "info" | "start" | "end" | "done"
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| "undo" ;
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filter ::= filter_part+ ;
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filter_part ::= tag_add | tag_remove | attribute | word ;
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tag_add ::= "+" word ;
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tag_remove ::= "-" word ;
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attribute ::= word ":" word ;
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word ::= ...
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file ::= ...
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id ::= digit+ ;
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digit ::= "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" ;
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substitution ::= "/" word+ "/" word* "/" ;
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