/usr/share/ada/adainclude/texttools/strings.adb is in libtexttools5-dev 2.1.0-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- STRINGS (package body) --
-- --
-- Part of TextTools --
-- Designed and Programmed by Ken O. Burtch --
-- --
------------------------------------------------------------------------------
-- --
-- Copyright (C) 1999-2007 Ken O. Burtch --
-- --
-- This is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 2, or (at your option) any later ver- --
-- sion. This is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with this; see file COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- This is maintained at http://www.pegasoft.ca/tt.html --
-- --
------------------------------------------------------------------------------
with Ada.Strings.Fixed;
with Ada.Strings.Maps.Constants;
package body strings is
dips : constant string := "upanlyscolableutalisifensusteasauayeeieoeseyiaotoouuichetirontrshaithoaghurngeregundewhbackamedorvarine a d f o n r s e_r_s_e.";
Case_Mappings : constant array (Boolean) of Ada.Strings.Maps.Character_Mapping
:= (True => Ada.Strings.Maps.Constants.Upper_Case_Map,
False => Ada.Strings.Maps.Identity);
procedure FixSpacing( s : in out unbounded_string ) is
-- remove leading and trailing spaces, as well as any double-spaces inside
i : Integer := 1;
begin
Trim (S, Side => Ada.Strings.Both);
while i < length(s) loop
if Element( s, i ) = ' ' and then Element( s, i+1 ) = ' ' then
Delete( s, i, i );
i := i - 1;
end if;
i := i + 1;
end loop;
end FixSpacing;
function PhoneticsOf( s : string ) return String is
-- reduce string to ENGLISH phonetics
-- equivalences from Talking Tools pg.12 (and from guessing)
pos : natural := S'First; -- position in s
ppos : natural := 1; -- position in PhoneticString
PhoneticString : Unbounded_String := Null_Unbounded_String; -- the resulting phonetics
ch : character; -- current character in s
AllowDuplicate : boolean := false; -- TRUE to discard same adjacents
function NextChar return character is
-- get the next character (if none, return a space)
ch : character;
begin
if Pos < S'Last then
Ch := S (pos+1);
if ch >= 'A' and ch <= 'Z' then
Ch := character'val( character'pos(ch) + 32 );
end if;
return ch;
else
return ' ';
end if;
end NextChar;
procedure Add( c : character ) is
-- add a phoeme to the Phonetic String, discarding adjacent duplicates
-- if it's OK. Some very similar sounds are grouped together (th & d)
begin
if ppos = 1 or AllowDuplicate then
Append( PhoneticString, c );
ppos := ppos + 1;
AllowDuplicate := false;
else
if Element( PhoneticString, ppos-1 ) /= c then
Append( PhoneticString, c );
ppos := ppos + 1;
end if;
end if;
end Add;
procedure SkipChar is
-- macro to advance to next position in s
begin
pos := pos + 1;
end SkipChar;
pragma Inline( SkipChar );
begin
while Pos <= S'Last loop
ch := S (Pos);
if ch >= 'A' and ch <= 'Z' then
ch := character'val( character'pos(ch) + 32 );
end if;
case ch is
when 'a' =>
case NextChar is
when 'a'|'e'|'i'|'y' => -- aa, ae, ai, ay
Add( 'A' );
SkipChar;
when 'r' => -- ar
Add( 'R' );
SkipChar;
when 'u' => -- au
Add( 'U' );
SkipChar;
when others =>
Add( 'A' ); -- a
end case;
when 'b' => -- b
Add( 'B' );
when 'd' => -- d
Add( 'D' );
when 't' =>
if NextChar = 'h' then -- th (H)
Add( 'H' );
SkipChar;
else
Add( 'D' ); -- t (=d)
end if;
when 'p' =>
if NextChar = 'h' then -- ph (F)
Add( 'F' );
SkipChar;
else
Add( 'P' ); -- p
end if;
when 'c' => -- c*
if NextChar = 'h' then -- ch (Y)
Add( 'Y' );
SkipChar;
else
Add( 'C' );
end if;
when 'e' =>
case NextChar is
when 'a' => Add( 'E' ); SkipChar; -- ea
when 'i' => Add( 'I' ); SkipChar; -- ei
when 'e' => Add( 'E' ); SkipChar; -- ee
when 'r' => Add( 'R' ); SkipChar; -- er
when 'u' => Add( 'U' ); SkipChar; -- eu
when 'y' => Add( 'A' ); SkipChar; -- ey
when ' '|'?'|'''|':'|';'|'.'|',' => SkipChar; -- e (silent)
when others => -- e
Add( 'E' );
end case;
when 'f' => -- f
Add( 'F' );
when 'g' => -- gh
if NextChar = 'h' then
SkipChar;
else
Add( 'G' ); -- g*
end if;
when 'h' => -- h
null;
when 'i' => -- i
if NextChar = 'e' then -- ie
Add( 'E' );
SkipChar;
elsif NextChar = 'r' then -- ir
Add( 'R' );
SkipChar;
elsif NextChar = 'o' then -- ion
pos := pos + 1;
if NextChar = 'n' then
Add( 'U' );
Add( 'N' );
SkipChar;
else
pos := pos - 1; -- treat normally
Add( 'I' );
end if;
else
Add( 'I' );
end if;
when 'j' => -- j
Add( 'J' );
when 'k'|'q' => -- k
Add('K');
if NextChar = 'u' then -- qu (KW)
Add( 'W' );
SkipChar;
end if;
when 'l'|'r' => -- l, r
Add( 'R' );
when 'm' => -- m
Add( 'N' );
when 'n' =>
if NextChar = 'g' then
SkipChar; -- ng (=n)
end if;
Add( 'N' ); -- n
when 'o' =>
case NextChar is
when 'a' => -- oa
Add( 'O' );
SkipChar;
when 'o' => -- oo
Add( 'U' );
SkipChar;
when 'r' => -- or
Add( 'R' );
SkipChar;
when 'u' => -- ou
Add( 'U' );
SkipChar;
when others => -- o
Add( 'O' );
end case;
when 's' => -- sh (H)
if NextChar = 'h' then
Add( 'H' );
SkipChar;
else
Add( 'S' ); -- s
end if;
when 'u' =>
if NextChar = 'y' then -- uy
Add( 'I' );
SkipChar;
elsif NextChar = 'r' then -- ur
Add( 'R' );
SkipChar;
else
Add ( 'U' ); -- u
end if;
when 'v' => -- v
Add( 'V' );
when 'w' => -- w
Add( 'W' );
when 'x'|'z' => -- x, z
Add( 'Z' );
when 'y' => -- y
Add( 'I' );
when others =>
AllowDuplicate := true; -- allow two together if sep by sp, ', etc
if ch >= '0' and ch <= '9' then -- 0...9
Add( ch );
AllowDuplicate := true;
end if;
end case;
pos := pos + 1;
end loop;
return To_String (PhoneticString);
end PhoneticsOf;
function TypoOf( BadString, GoodString : String) return boolean is
-- 80% of all typos are single insertions, deletions, exchanges, or subs.
begin
if BadString = GoodString
or BadString'Length < 4
or GoodString'Length < 4 then
-- identical or too short to test reliably?
return false;
end if;
-- Single Insertion
if BadString'Length = GoodString'Length + 1 then
for I in BadString'Range loop
if BadString (Badstring'First .. I - 1)
& Badstring (I + 1 .. Badstring'Last) = GoodString then
return True;
end if;
end loop;
end if;
-- Single Deletion
if BadString'Length = GoodString'Length - 1 then
for i in GoodString'Range loop
if GoodString (Goodstring'First .. I - 1)
& Goodstring (I + 1 .. Goodstring'Last) = BadString then
return True;
end if;
end loop;
end if;
-- Single Exchange or Substitution
if BadString'Length = GoodString'Length then
declare
TempStr : String := BadString;
Tempchar : Character;
begin
for i in Badstring'First .. BadString'Last - 1 loop
TempChar := tempstr (I);
tempstr (I) := Tempstr (I + 1);
tempstr (I + 1) := Tempchar;
if TempStr = GoodString then
return True;
end if;
Tempstr (I .. I + 1) := Badstring (I .. I + 1);
Tempstr (I) := Goodstring (I - Tempstr'First + Goodstring'First);
if Tempstr = Goodstring then
return True;
end if;
Tempstr (I) := Badstring (I);
end loop;
end;
end if;
return False;
end TypoOf;
procedure Tokenize (S : in string;
Words : in out strlist.Vector;
ch : in out character ) is
-- encode a word as a character > 127
Index : Natural;
begin
Index := Words.Find_Index (S);
if Index = 0 or Index > 128 then
ch := character'val( Index ); --' ';
else
ch := character'val( Index + 127 );
end if;
end Tokenize;
procedure Untokenize (Ch : in Character;
Words : in out Strlist.Vector;
S : in out unbounded_string) is
begin
s := Null_Unbounded_String;
if character'pos( ch ) > 127 then
S := To_Unbounded_String (Words.Element (Character'Pos (Ch) - 127));
end if;
end Untokenize;
function FGREP (s : string;
text : string;
filter_out : boolean := false;
case_insensitive : boolean := false )
return Boolean
is
begin
return Ada.Strings.Fixed.Index (Text,
S,
Mapping => Case_Mappings (Case_Insensitive)) > 0
xor Filter_Out;
end FGREP;
function FGREP (s : string;
text : string;
filter_out : boolean := false;
case_insensitive : boolean := false )
return String
is
begin
if FGREP (S, Text, Filter_Out, Case_Insensitive) then
return text;
else
return "";
end if;
end FGREP;
procedure FGREP (s : in String;
text : in Strlist.Vector;
result : out boolean;
filter_out : boolean := false;
case_insensitive : boolean := false )
is
begin
Result := False;
for I in 1 .. Integer (Text.Length) loop
Result := FGREP (S, Text.Element (I), Filter_Out, Case_Insensitive);
exit when Result;
end loop;
end FGREP;
procedure FGREP (s : string;
text : in out Strlist.Vector;
filter_out : boolean := false;
case_insensitive : boolean := false )
is
I : Positive := 1;
begin
while I <= Integer (Text.Length) loop
if FGREP (S, Text.Element (I), Filter_Out, case_insensitive) then
I := I + 1;
else
Text.Delete (I);
end if;
end loop;
end FGREP;
---> ASCII Encode/Decode
separator : constant character := character'val(1);
procedure Encode( estr : in out EncodedString; i : integer ) is
begin
Append( estr, integer'image( i ) );
Append( estr, separator );
end Encode;
procedure Encode( estr : in out EncodedString; r : ARect ) is
begin
Encode( estr, r.left );
Encode( estr, r.top );
Encode( estr, r.right );
Encode( estr, r.bottom );
end Encode;
procedure Encode( estr : in out EncodedString; l : long_integer ) is
begin
Append( estr, long_integer'image( l ) );
Append( estr, separator );
end Encode;
procedure Encode( estr : in out EncodedString; s : string) is
begin
Append( estr, s);
Append( estr, separator );
end Encode;
procedure Encode( estr : in out EncodedString; c : character ) is
begin
Append( estr, c );
end Encode;
procedure Encode( estr : in out EncodedString; b : boolean ) is
begin
if b then
Append( estr, 'T' );
else
Append( estr, 'F' );
end if;
end Encode;
procedure Decode( estr : in out EncodedString; i : out integer ) is
idx : integer := 1;
begin
while Element( estr, idx ) /= separator loop
idx := idx + 1;
end loop;
i := integer'Value (Slice (estr, 1, Idx - 1));
Tail (estr, Length (Estr) - Idx);
end Decode;
procedure Decode( estr : in out EncodedString; r : out ARect ) is
begin
Decode( estr, r.left );
Decode( estr, r.top );
Decode( estr, r.right );
Decode( estr, r.bottom );
end Decode;
procedure Decode( estr : in out EncodedString; l : out long_integer ) is
idx : integer := 2;
begin
while Element( estr, idx ) /= separator loop
idx := idx + 1;
end loop;
l := long_integer'Value (Slice (estr, 1, Idx - 1));
Tail (estr, Length (Estr) - Idx);
end Decode;
procedure Decode( estr : in out EncodedString; s : out Unbounded_String) is
pos : constant Natural := Index (Estr, (1 => Separator));
begin
s := Head (estr, pos - 1 );
Tail (estr, Length (Estr) - Pos);
end Decode;
procedure Decode( estr : in out EncodedString; c : out character ) is
begin
c := Element( estr, 1 );
Tail (estr, Length (Estr) - 1);
end Decode;
procedure Decode( estr : in out EncodedString; b : out boolean ) is
c : character := ASCII.NUL;
begin
Decode( estr, c );
pragma Assert (C = 'T' or C = 'F');
b := (c = 'T');
end Decode;
-- BASIC PACK
--
-- Compress string s using dipthong compression resulting in a new string of
-- 50% to 100% the size of the original. s must contain only lower ASCII
-- characters since the upper ASCII characters are used for the compression.
------------------------------------------------------------------------------
function basic_pack( s : string ) return packed_string is
dip : string(1..2);
i : positive;
dip_pos : natural;
result : unbounded_string;
begin
i := s'first;
result := null_unbounded_string;
loop
exit when i > s'last;
dip_pos := 0;
if i /= s'last then
dip := s(i..i+1);
for j in dips'first..dips'last-1 loop
if dip = dips(j..j+1) then
dip_pos := j;
exit;
end if;
end loop;
end if;
if dip_pos > 0 then
result := result & character'val( dip_pos + 127 );
i := i + 2;
else
result := result & s(i);
i := i + 1;
end if;
end loop;
return packed_string( to_string( result ) );
end basic_pack;
-- UNPACK
--
-- Decompress string s that was compressed using basic_pack.
------------------------------------------------------------------------------
function unpack( s : packed_string ) return string is
dip_pos : positive;
newstr : unbounded_string;
begin
for i in s'range loop
if character'pos( s(i) ) >= 128 then
dip_pos := character'pos( s(i) ) - 127;
newstr := newstr & dips( dip_pos..dip_pos+1 );
else
newstr := newstr & s(i);
end if;
end loop;
return to_string( newstr );
end unpack;
end strings;
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