Mercurial > urweb
view lib/ur/string.ur @ 2083:9f65e2188d3c
MonoOpt: remove concatenation with empty string
author | Adam Chlipala <adam@chlipala.net> |
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date | Wed, 03 Dec 2014 21:21:37 -0500 |
parents | 1a4b2b983889 |
children |
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type t = Basis.string val str = Basis.str1 val length = Basis.strlen val lengthGe = Basis.strlenGe val append = Basis.strcat val sub = Basis.strsub val suffix = Basis.strsuffix val index = Basis.strindex fun sindex r = Basis.strsindex r.Haystack r.Needle val atFirst = Basis.strchr fun mindex {Haystack = s, Needle = chs} = let val n = Basis.strcspn s chs in if n >= length s then None else Some n end fun substring s {Start = start, Len = len} = Basis.substring s start len fun seek s ch = case index s ch of None => None | Some i => Some (suffix s (i + 1)) fun mseek {Haystack = s, Needle = chs} = case mindex {Haystack = s, Needle = chs} of None => None | Some i => Some (sub s i, suffix s (i + 1)) fun split s ch = case index s ch of None => None | Some i => Some (substring s {Start = 0, Len = i}, suffix s (i + 1)) fun split' s ch = case index s ch of None => None | Some i => Some (substring s {Start = 0, Len = i}, suffix s i) fun msplit {Haystack = s, Needle = chs} = case mindex {Haystack = s, Needle = chs} of None => None | Some i => Some (substring s {Start = 0, Len = i}, sub s i, suffix s (i + 1)) fun ssplit r = case sindex r of None => None | Some i => Some (substring r.Haystack {Start = 0, Len = i}, suffix r.Haystack (i + length r.Needle)) fun all f s = let val len = length s fun al i = i >= len || (f (sub s i) && al (i + 1)) in al 0 end fun mp f s = let fun mp' i acc = if i < 0 then acc else mp' (i - 1) (str (f (sub s i)) ^ acc) in mp' (length s - 1) "" end fun newlines [ctx] [[Body] ~ ctx] (s : string) : xml ([Body] ++ ctx) [] [] = case split s #"\n" of None => cdata s | Some (s1, s2) => <xml>{[s1]}<br/>{newlines s2}</xml> fun isPrefix {Full = f, Prefix = p} = length f >= length p && substring f {Start = 0, Len = length p} = p fun trim s = let val len = length s fun findStart i = if i < len && isspace (sub s i) then findStart (i+1) else i fun findFinish i = if i >= 0 && isspace (sub s i) then findFinish (i-1) else i val start = findStart 0 val finish = findFinish (len - 1) in if finish >= start then substring s {Start = start, Len = finish - start + 1} else "" end