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<H1> A.4.7 Wide_String Handling</H1>
<DIV Class="Paranum"><FONT SIZE=-2>1</FONT></DIV>
<DIV Class="Normal"> Facilities for handling strings of Wide_Character
elements are found in the packages Strings.Wide_Maps, Strings.Wide_Fixed,
Strings.Wide_Bounded, Strings.Wide_Unbounded, and Strings.Wide_Maps.Wide_Constants.
They provide the same string-handling operations as the corresponding
packages for strings of Character elements. <A NAME="I5446"></A><A NAME="I5447"></A><A NAME="I5448"></A><A NAME="I5449"></A><A NAME="I5450"></A><A NAME="I5451"></A><A NAME="I5452"></A><A NAME="I5453"></A><A NAME="I5454"></A></DIV>
<H4 ALIGN=CENTER>Static Semantics</H4>
<DIV Class="Paranum"><FONT SIZE=-2>2</FONT></DIV>
<DIV Class="Normal"> The package Strings.Wide_Maps has the following
declaration. </DIV>
<DIV Class="Paranum"><FONT SIZE=-2>3</FONT></DIV>
<DIV Class="Examples"><TT><A NAME="I5455"></A><A NAME="I5456"></A><A NAME="I5457"></A><B>package</B> Ada.Strings.Wide_Maps <B>is</B><BR>
<B>pragma</B> Preelaborate(Wide_Maps);</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>4</FONT></DIV>
<DIV Class="Examples"><TT> --<I> Representation for a set of Wide_Character values:</I><BR>
<B>type</B> <A NAME="I5458"></A><A NAME="I5459"></A>Wide_Character_Set <B>is</B> <B>private</B>;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>5</FONT></DIV>
<DIV Class="Examples"><TT> <A NAME="I5460"></A>Null_Set : <B>constant</B> Wide_Character_Set;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>6</FONT></DIV>
<DIV Class="Examples"><TT> <B>type</B> <A NAME="I5461"></A><A NAME="I5462"></A>Wide_Character_Range <B>is</B><BR>
<B>record</B><BR>
Low : Wide_Character;<BR>
High : Wide_Character;<BR>
<B>end</B> <B>record</B>;<BR>
-- <I>Represents Wide_Character range Low..High</I></TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>7</FONT></DIV>
<DIV Class="Examples"><TT> <B>type</B> <A NAME="I5463"></A><A NAME="I5464"></A>Wide_Character_Ranges <B>is</B> <B>array</B> (Positive <B>range</B> <>)<BR>
<B>of</B> Wide_Character_Range;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>8</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5465"></A><A NAME="I5466"></A>To_Set (Ranges : <B>in</B> Wide_Character_Ranges)<BR>
<B>return</B> Wide_Character_Set;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>9</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5467"></A><A NAME="I5468"></A>To_Set (Span : <B>in</B> Wide_Character_Range)<BR>
<B>return</B> Wide_Character_Set;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>10</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5469"></A><A NAME="I5470"></A>To_Ranges (Set : <B>in</B> Wide_Character_Set)<BR>
<B>return</B> Wide_Character_Ranges;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>11</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> "=" (Left, Right : <B>in</B> Wide_Character_Set) <B>return</B> Boolean;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>12</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> "<B>not</B>" (Right : <B>in</B> Wide_Character_Set)<BR>
<B>return</B> Wide_Character_Set;<BR>
<B>function</B> "<B>and</B>" (Left, Right : <B>in</B> Wide_Character_Set)<BR>
<B>return</B> Wide_Character_Set;<BR>
<B>function</B> "<B>or</B>" (Left, Right : <B>in</B> Wide_Character_Set)<BR>
<B>return</B> Wide_Character_Set;<BR>
<B>function</B> "<B>xor</B>" (Left, Right : <B>in</B> Wide_Character_Set)<BR>
<B>return</B> Wide_Character_Set;<BR>
<B>function</B> "<B>-</B>" (Left, Right : <B>in</B> Wide_Character_Set)<BR>
<B>return</B> Wide_Character_Set;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>13</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5471"></A><A NAME="I5472"></A>Is_In (Element : <B>in</B> Wide_Character;<BR>
Set : <B>in</B> Wide_Character_Set)<BR>
<B>return</B> Boolean;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>14</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5473"></A><A NAME="I5474"></A>Is_Subset (Elements : <B>in</B> Wide_Character_Set;<BR>
Set : <B>in</B> Wide_Character_Set)<BR>
<B>return</B> Boolean;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>15</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> "<=" (Left : <B>in</B> Wide_Character_Set;<BR>
Right : <B>in</B> Wide_Character_Set)<BR>
<B>return</B> Boolean <B>renames</B> Is_Subset;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>16</FONT></DIV>
<DIV Class="Examples"><TT> --<I> Alternative representation for a set of Wide_Character values:</I><BR>
<B>subtype</B> <A NAME="I5475"></A>Wide_Character_Sequence <B>is</B> Wide_String;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>17</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5476"></A><A NAME="I5477"></A>To_Set (Sequence : <B>in</B> Wide_Character_Sequence)<BR>
<B>return</B> Wide_Character_Set;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>18</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5478"></A><A NAME="I5479"></A>To_Set (Singleton : <B>in</B> Wide_Character)<BR>
<B>return</B> Wide_Character_Set;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>19</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5480"></A><A NAME="I5481"></A>To_Sequence (Set : <B>in</B> Wide_Character_Set)<BR>
<B>return</B> Wide_Character_Sequence;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>20</FONT></DIV>
<DIV Class="Examples"><TT> --<I> Representation for a Wide_Character to Wide_Character mapping:</I><BR>
<B>type</B> <A NAME="I5482"></A><A NAME="I5483"></A>Wide_Character_Mapping <B>is</B> <B>private</B>;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>21</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5484"></A><A NAME="I5485"></A>Value (Map : <B>in</B> Wide_Character_Mapping;<BR>
Element : <B>in</B> Wide_Character)<BR>
<B>return</B> Wide_Character;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>22</FONT></DIV>
<DIV Class="Examples"><TT> <A NAME="I5486"></A>Identity : <B>constant</B> Wide_Character_Mapping;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>23</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5487"></A><A NAME="I5488"></A>To_Mapping (From, To : <B>in</B> Wide_Character_Sequence)<BR>
<B>return</B> Wide_Character_Mapping;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>24</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5489"></A><A NAME="I5490"></A>To_Domain (Map : <B>in</B> Wide_Character_Mapping)<BR>
<B>return</B> Wide_Character_Sequence;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>25</FONT></DIV>
<DIV Class="Examples"><TT> <B>function</B> <A NAME="I5491"></A><A NAME="I5492"></A>To_Range (Map : <B>in</B> Wide_Character_Mapping)<BR>
<B>return</B> Wide_Character_Sequence;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>26</FONT></DIV>
<DIV Class="Examples"><TT> <B>type</B> <A NAME="I5493"></A><A NAME="I5494"></A>Wide_Character_Mapping_Function <B>is</B><BR>
<B>access</B> <B>function</B> (From : <B>in</B> Wide_Character) <B>return</B> Wide_Character;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>27</FONT></DIV>
<DIV Class="Examples"><TT><B>private</B><BR>
... -- <I>not specified by the language</I><BR>
<B>end</B> Ada.Strings.Wide_Maps;</TT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>28</FONT></DIV>
<DIV Class="Normal"> <A NAME="I5495"></A><A NAME="I5496"></A><A NAME="I5497"></A>The
context clause for each of the packages Strings.Wide_Fixed, Strings.Wide_Bounded,
and Strings.Wide_Unbounded identifies Strings.Wide_Maps instead of Strings.Maps.</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>29</FONT></DIV>
<DIV Class="Normal" Style="margin-bottom: 0.4em"> For each of the
packages Strings.Fixed, Strings.Bounded, Strings.Unbounded, and Strings.Maps.Constants
the corresponding wide string package has the same contents except that
</DIV>
<DIV Class="Paranum"><FONT SIZE=-2>30</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC>Wide_Space replaces Space</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>31</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC>Wide_Character replaces Character</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>32</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC>Wide_String replaces String</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>33</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC>Wide_Character_Set replaces Character_Set</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>34</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC>Wide_Character_Mapping replaces Character_Mapping</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>35</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC>Wide_Character_Mapping_Function replaces Character_Mapping_Function</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>36</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC>Wide_Maps replaces Maps</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>37</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC>Bounded_Wide_String replaces Bounded_String</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>38</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC>Null_Bounded_Wide_String replaces Null_Bounded_String</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>39</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC>To_Bounded_Wide_String replaces To_Bounded_String</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>40</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC>To_Wide_String replaces To_String</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>41</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC>Unbounded_Wide_String replaces Unbounded_String</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>42</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC>Null_Unbounded_Wide_String replaces Null_Unbounded_String</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>43</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC>Wide_String_Access replaces String_Access</LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>44</FONT></DIV>
<UL Class="Bulleted"><LI TYPE=DISC>To_Unbounded_Wide_String replaces To_Unbounded_String </LI></UL>
<DIV Class="Paranum"><FONT SIZE=-2>45</FONT></DIV>
<DIV Class="Normal" Style="margin-bottom: 0.4em"> The following additional
declaration is present in Strings.Wide_Maps.Wide_Constants: </DIV>
<DIV Class="Paranum"><FONT SIZE=-2>46</FONT></DIV>
<DIV Class="Examples"><TT><A NAME="I5498"></A>Character_Set : <B>constant</B> Wide_Maps.Wide_Character_Set;<BR>
--<I>Contains each Wide_Character value WC such that Characters.Is_Character(WC) is True</I></TT></DIV>
<DIV Class="NotesHeader"><FONT SIZE=-1>NOTES</FONT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>47</FONT></DIV>
<DIV Class="Notes"><FONT SIZE=-1>12 <A NAME="I5499"></A>If
a null Wide_Character_Mapping_Function is passed to any of the Wide_String
handling subprograms, Constraint_Error is propagated.</FONT></DIV>
<DIV Class="Paranum"><FONT SIZE=-2>48</FONT></DIV>
<DIV Class="Notes"><FONT SIZE=-1>13 Each Wide_Character_Set
constant in the package Strings.Wide_Maps.Wide_Constants contains no
values outside the Character portion of Wide_Character. Similarly, each
Wide_Character_Mapping constant in this package is the identity mapping
when applied to any element outside the Character portion of Wide_Character.
</FONT></DIV>
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