unicode-collation 0.0.1

Unicode collation algorithm according to Technical Standard #10.
Documentation 
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table       = { soi ~ version ~ implicit* ~ entry+ ~ eoi }
implicit    = { "@implicitweights" ~ codepoint ~ ".." ~ codepoint ~ ";" ~ weight }
version     = { "@version" ~ major ~ "." ~ minor ~ "." ~ variant }
entry       = { codepoints ~ ";" ~ elements }

codepoints  = { codepoint+ }
elements    = { element+ }

weight      =@{ hex ~ hex ~ hex ~ hex } 
element     = { "[" ~ alt ~ weight ~ "." ~ weight ~ "." ~ weight ~ ("." ~ weight)? ~ "]" }
alt         = { "*" | "." }
major       =@{ digit+ }
minor       =@{ digit+ }
variant     =@{ digit+ }

codepoint   =@{ hex+ }
hex         = { '0'..'9' | 'A'..'F' }
digit       = { '0'..'9' }

// Comments and whitespaces
newline     = _{ "\r" | "\n" } // Note: we accept any invalid newline as well
comment     = _{ "#" ~ (!newline ~ any)* }
whitespace  = _{ " " | "\t" | newline }