collate.sa


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-- Copyright (C) 2000 by K Hopper, University of Waikato, New Zealand        --
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partial class COLLATE

partial class COLLATE is -- This partial class provides the equality and order testing operations -- on text strings in accordance with ISO/IEC 14651 string collating standard. -- It is designed to be included in STR, FSTR, RUNES and FRUNES. -- Version 1.1 Apr 99. Copyright K Hopper, U of Waikato -- Development History -- ------------------- -- Date Who By Detail -- ---- ------ ------ -- 5 Mar 97 kh Original from the ISO draft. -- 12 Apr 99 kh Minor changes for Version 8 of text classes. private is_eq_helper( other : SAME ) : BOOL is -- This routine returns true if and only if all characters of other -- are the same as the corresponding character of self. loop if elt! /= other.elt! then return false end end ; return true end ; is_eq( other : SAME ) : BOOL is -- This equality routine is included here for use in the ordering -- routines. It returns true if and only if the two strings self and -- other consist of an identical character sequence. Their encodings -- do NOT have to be the same. if size = 0 then return other.size = 0 elsif (other.size = 0) or size /= other.size then return false else return is_eq_helper(other) end end ; is_lt( other : SAME ) : BOOL is -- This routine returns true if and only if self is earlier in the -- collating sequence (according to the international collating standard), -- irrespective of encoding. if size = 0 then return other.size /= 0 elsif other.size = 0 then return false else return CULTURE::default.collating.earlier(str,other.str) end end ; end ; -- COLLATE