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lazarus-ccr/applications/fpbrowser/mod_braille.pas

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(*
The function to_braille from this unit translates a string from UTF8 chars to Braille chars.
The dictionaries were taken from http://www.ibc.gov.br/?catid=110&blogid=1&itemid=479
and from http://www.braillevirtual.fe.usp.br/pt/Portugues/braille.html
Copyright 2011
*)
unit mod_braille;
interface
{$mode objfpc}{$H+}
uses
browsermodules, lclproc;
type
{ TBrailleBrowserModule }
TBrailleBrowserModule = class(TBrowserModule)
public
constructor Create; override;
function HandleOnPageLoad(AInput: string; out AOutput: string): Boolean; override;
end;
function ConvertUTF8TextToBraille(Line: string): string;
function ConvertUTF8HtmlTextToBraille(AInput: string): string;
function ConvertUTF8TextToBrailleNew(AInput: string): string;
implementation
type
dictionary = array[1..33] of string;
const
number_signal = chr($e2) + chr($a0) + chr($bc);
caps_signal = chr($e2) + chr($a0) + chr($a8);
d1: dictionary = ({<space>} chr($80), {!} chr($96), {"} chr($a6), {#} 'TODO', {(*$*)} chr($b0),
{%} chr($b8) + chr($e2) + chr($a0) + chr($b4), {&} chr($af), {'} chr($84),
{(} chr($a3) + chr($e2) + chr($a0) + chr($84), {)} chr($a0) + chr($e2) + chr($a0) + chr($9c),
{*} chr($94), {+} chr($96), {,} chr($82), {-} chr($a4), {.} chr($84),
{/} chr($90) + chr($e2) + chr($a0) + chr($b2), {0} chr($9a), {1} chr($81),
{2} chr($83), {3} chr($89), {4} chr($99), {5} chr($91), {6} chr($8b),
{7} chr($9b), {8} chr($93), {9} chr($8a), {:} chr($92), {;} chr($86),
{<} chr($aa), {=} chr($b6), {>} chr($95), {?} chr($a2), {@} 'TODO');
d2: dictionary = ({a} chr($81), {b} chr($83), {c} chr($89), {d} chr($99),
{e} chr($91), {f} chr($8b), {g} chr($9b), {h} chr($93), {i} chr($8a),
{j} chr($9a), {k} chr($85), {l} chr($87), {m} chr($8d), {n} chr($9d),
{o} chr($95), {p} chr($8f), {q} chr($9f), {r} chr($97), {s} chr($8e),
{t} chr($9e), {u} chr($a5), {v} chr($a7), {w} chr($ba), {x} chr($ad),
{y} chr($bd), {z} chr($b5), '', '', '', '', '', '', '');
d3: dictionary = ({a + grave} chr($ab), {a + acute} chr($b7),
{a + circumflex} chr($a1), {a + tilde} chr($9c), {a + diaeresis} 'TODO',
{a + ring above} 'TODO', {ae} 'TODO', {c + cedilla} chr($af),
{e + grave} chr($ae), {e + acute} chr($bf), {e + circumflex} chr($a3),
{e + diaeresis} 'TODO', {i + grave} chr($a9), {i + acute} chr($8c),
{i + circumflex} 'TODO', {i + diaeresis} chr($bb), {eth} 'TODO',
{n + tilde} 'TODO', {o + grave} chr($ba), {o + acute} chr($ac),
{o + circumflex} chr($b9), {o + tilde} chr($aa), {o + diaeresis} 'TODO',
{division sign} 'TODO', {o + stroke} 'TODO', {u + grave} chr($b1),
{u + acute} chr($be), {u + circumflex} 'TODO', {u + diaeresis} chr($b3),
{y + acute} 'TODO', {thorn} 'TODO', {y + diaeresis} 'TODO', '');
function ConvertUTF8TextToBrailleNew(AInput: string): string;
var
lInput: PChar;
lPos: Integer;
lCharSize: Integer;
lCurChar: string;
begin
Result := '';
lInput := PChar(AInput);
lPos := 0;
while lPos < Length(AInput) do
begin
lCharSize := LCLProc.UTF8CharacterLength(lInput);
SetLength(lCurChar, lCharSize);
Move(lCurChar[1], lInput^, lCharSize);
{Result := Result + ConvertUTF8CharacterToBraille(lCurChar);}
Inc(lInput, lCharSize);
Inc(lPos, lCharSize);
end;
end;
function ConvertUTF8TextToBraille(Line: string): string;
var
lCharSize, count, n, next_n, len: integer;
Braille_string: string;
Pline: Pchar;
num, caps: boolean;
f: TextFile;
begin
Braille_string := '';
num := False;
caps := False;
count := 1;
AssignFile(f, 'test');
Rewrite(f);
if Line = '' then Result := '';
len := length(Line);
Pline := PChar(Line);
while count <= len do
begin
lCharSize := LCLProc.UTF8CharacterLength(PLine);
if (lCharSize = 1) then
begin
n := Ord(Line[count]);
if (n = 9) then Braille_string := Braille_string + #9
else
if (n = 10) then Braille_string := Braille_string + #10
else
begin
if ((n >= 97) and (n <= 122)) then {a lower case letter}
Braille_string := Braille_string + chr($e2) + chr($a0) + d2[n - 96]
else
begin
if ((n >= 65) and (n <= 90)) then {an upper case letter}
begin
if not caps then
begin
Braille_string := Braille_string + caps_signal;
if (count + 2 < length(Line)) then
begin
next_n := Ord(Line[count + 1]);
if ((next_n >= 65) and (next_n <= 90)) or ((next_n = 195) and ((Ord(Line[count + 2]) >= 128) and (Ord(Line[count + 2]) <= 159))) then {if the next char is also upper case, add another caps signal}
begin
Braille_string := Braille_string + caps_signal;
caps := True;
end;
end;
end;
Braille_string := Braille_string + chr($e2) + chr($a0) + d1[n - 31];
if (count + 1 <= length(Line)) then
begin
next_n := Ord(Line[count + 1]);
if not(((next_n >= 65) and (next_n <= 90)) or ((next_n = 195) and ((Ord(Line[count + 2]) >= 128) and (Ord(Line[count + 2]) <= 159)))) then caps := False; {if the next char is not upper case, unflag <caps>}
end;
end
else
begin
if (n >= 48) and (n <= 57) then {a number}
begin
if not num then Braille_string := Braille_string + number_signal; {first algarism of a number, add a number signal}
num := True;
Braille_string := Braille_string + chr($e2) + chr($a0) + d1[n - 31];
if (count + 1 <= length(Line)) then
begin
next_n := Ord(Line[count + 1]);
if not ((next_n >= 48) and (next_n <= 57) or (next_n = 44) or (next_n = 46)) then num := False; {the next char is not a number, nor ',', nor '.', then unflag <num>}
end;
end
else
begin
if (n >= 32) and (n <= 64) then {a char from the first dictionary}
begin
Braille_string := Braille_string + chr($e2) + chr($a0) + d1[n - 31];
if (count + 1 <= length(Line)) then
begin
next_n := Ord(Line[count + 1]);
if ((n = 44) or (n = 46)) and not ((next_n >= 48) and (next_n <= 57)) then num := False; {if the char is a ',' or a '.' but the next is not a number, unflag <num>}
end;
end;
end;
end;
end;
end;
end
else
begin
if (lCharSize = 2) then
begin
n := Ord(Line[count]);
if (n = 195) then
begin
n := Ord(Line[count + 1]);
if (n >= 128) and (n <= 159) then {upper case accented char}
begin
if not caps then
begin
Braille_string := Braille_string + caps_signal;
if (count + 2 <= length(Line)) then
begin
next_n := Ord(Line[count + 2]);
if ((next_n >= 65) and (next_n <= 90)) or ((next_n = 195) and ((Ord(Line[count + 2]) >= 128) and (Ord(Line[count + 2]) <= 159))) then {if the next char is also upper case, add another caps signal}
begin
Braille_string := Braille_string + caps_signal;
caps := True;
end;
end;
end;
Braille_string := Braille_string + chr($e2) + chr($a0) + d3[n - 127];
if (count + 3 <= length(Line)) then
begin
next_n := Ord(Line[count + 2]);
if not(((next_n >= 65) and (next_n <= 90)) or ((next_n = 195) and ((Ord(Line[count + 3]) >= 128) and (Ord(Line[count + 3]) <= 159)))) then {if the next char is not upper case, unflag <caps>}
caps := False;
end;
end
else
if (n >= 160) and (n <= 191) then Braille_string := Braille_string + chr($e2) + chr($a0) + d3[n - 159]; {lower case accented letter}
end;
end;
end;
count := count + lCharSize;
Inc(Pline, lCharSize);
end;
Close(f);
Result := Braille_string;
end;
function ConvertUTF8HtmlTextToBraille(AInput: string): string;
var
i, j, lCharSize: integer;
output, aux_string, end_string: string;
is_text: boolean;
Pline : PChar;
begin
i := 1;
output := '';
aux_string := '';
is_text := False;
Pline := PChar(AInput);
while i <= length(AInput) do
begin
end_string := '';
while is_text and (i <= length(AInput)) do
begin
if (AInput[i] = '<') then
begin
is_text := False;
i := i + 1;
Inc(Pline, 1);
end_string := '<';
break;
end
else
begin
if ((AInput[i] = '/') and (AInput[i+1] = '/') and (AInput[i+2] = '<')) then
begin
is_text := False;
i := i + 3;
Inc(Pline, 3);
end_string := '//<';
break
end
end;
lCharSize := LCLProc.UTF8CharacterLength(Pline);
for j := 0 to lCharSize - 1 do aux_string := aux_string + AInput[i + j];
i := i + lCharSize;
Inc(Pline, lCharSize);
end;
output := output + ConvertUTF8TextToBraille(aux_string) + end_string;
aux_string := '';
while (not is_text) and (i <= length(AInput))do
begin
if (AInput[i] = '>') then
begin
is_text := True;
i := i + 1;
Inc(Pline, 1);
output := output + '>';
break
end;
lCharSize := LCLProc.UTF8CharacterLength(Pline);
for j := 0 to lCharSize - 1 do
output := output + AInput[i + j];
i := i + lCharSize;
Inc(Pline, lCharSize);
end;
end;
ConvertUTF8HtmlTextToBraille := output;
end;
{ TBrailleBrowserModule }
constructor TBrailleBrowserModule.Create;
begin
inherited Create;
ShortDescription := 'Braille Module';
end;
function TBrailleBrowserModule.HandleOnPageLoad(AInput: string; out
AOutput: string): Boolean;
begin
AOutput := ConvertUTF8HtmlTextToBraille(AInput);
end;
initialization
RegisterBrowserModule(TBrailleBrowserModule.Create());
end.
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