eradatestr.sa


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-- Copyright (C) 2000 by K Hopper, University of Waikato, New Zealand        --
-- This file is part of the GNU Sather library. It is free software; you may --
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-- This  library  is distributed  in the  hope that it will  be  useful, but --
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partial class ERADATE_STR < $TEXT, $ANCHORED_FMT

partial class ERADATE_STR < $TEXT, $ANCHORED_FMT is -- This partial class implements numeric date conversion routines, -- to and from character strings. -- NOTE This version is a dummy until overseas cultural help is available. -- Version 1.0 Feb 99. Copyright K Hopper, U of Waikato -- Development History -- ------------------- -- Date Who By Detail -- ---- ------ ------ -- 1 Feb 99 kh Original from DATE_STR is_date( str : STR ) : CONVERSION_RESULTS pre ~void(str) post (result = CONVERSION_RESULTS::All_Right) or (result = CONVERSION_RESULTS::Out_of_Range) or (result = CONVERSION_RESULTS::Bad_Format) or (result = CONVERSION_RESULTS::Empty) is -- This routine checks that the format of of the leading characters of -- the given string in the given repertoire and encoding corresponds to that -- required for a real number, returning the relevant result state. return CONVERSION_RESULTS::Bad_Format end ; build( loc_cursor : STR_CURSOR ) : SAME pre ~void(loc_cursor) and ~loc_cursor.is_done post ((result.count = 0) and (initial(loc_cursor.index) = loc_cursor.index)) or (initial(loc_cursor.index) < loc_cursor.index) is -- This routine creates the date contained in the string indicated. If -- the string does not contain a valid date then zero is returned and the -- cursor has not been moved! return from_days(0) end ; create( str : STR ) : SAME pre (is_date(str) = CONVERSION_RESULTS::All_Right) post true is -- This routine creates the whole number corresponding to the textual -- representation contained in str in the given repertoire and encoding. return build(str.cursor) end ; str( lib : LIBCHARS ) : STR is -- This routine returns the date as a string representation using the -- culture-defined formatting information. return void -- return lib.culture.date_time.date.fmt(self,lib) end ; str : STR is -- This routine returns the date as a string representation using the -- culture-dependent default formatting information. return str(LIBCHARS::default) end ; fmt( format : ANCHORED_DESCR, lib : LIBCHARS ) : STR pre ~void(format) and ~void(lib) post result.size > 0 is -- This routine returns a formatted representation of self in the given -- repertoire and encoding as dictated by the given format description. res : STR := str(lib) ; loc_fill : STR := STR::create(lib) + format.filler.char ; if res.size < format.leading then -- needs a filler res := loc_fill.repeat(format.width - res.size) + res end ; if format.trailing > 0 then return res + loc_fill.repeat(format.trailing) else return res end end ; fmt( format : ANCHORED_DESCR ) : STR pre ~void(format) post result.size > 0 is -- This routine returns a formatted representation of self in the default -- repertoire and encoding as dictated by the given format description. return fmt(format,LIBCHARS::default) end ; end ; -- ERADATE_STR