lazarus-ccr/applications/fpbrowser/utf8_braille.pas

(*	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
*)

Unit utf8_braille;

	interface

		Function Braille (Line: string): string;

		Type
		dictionary = array[1..32] of string;
		dictionary_pointer = ^dictionary;

		Const

		number_signal = chr($e2) + chr($a0) + chr($bc);
		caps_signal = chr($e2) + chr($a0) + chr($a8);

		d1:dictionary = ({!} 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');

	implementation

		Function Braille (Line: string): string;

			Var
			count, count_aux, n, n_aux, decr: integer;
			Braille_string, string_aux: string;
			num, accented: boolean;
			dict_p: dictionary_pointer;

			begin
			Braille_string := '';
			num := False;
			accented := False;
			New(dict_p);
			decr := 0;
			count := 1;
			n_aux := 0;
			if Line = '' then
				Braille := '';
			while count <= length(Line) do

				begin
				if Line[count] = ' ' then			{reproduce the empty space and go to next iteration}
					begin
						Braille_string := Braille_string + chr($e2)+chr($a0)+chr($80);
						count := count + 1;
						continue
					end;

				if accented then			{if the last iteration found n = 195, it means we have an accented character. Print it and go to next iteration}
					begin
						dict_p^ := d3;
						decr := 159;
						n := ord(Line[count]);
						if n < 160 then		{if it's a capital letter, put the caps signal and change to minuscule}
							begin
							Braille_string := Braille_string + caps_signal;
							n := n + 32
							end;								
						Braille_string := Braille_string + chr($e2) + chr($a0) + (dict_p^)[n-decr];
						accented := False;
						count := count + 1;
						continue
					end;

				n := ord(Line[count]);

				if ((n >= 97) and (n <= 122)) then			{if the char is a letter, choose d2}
					begin
						dict_p^ := d2;
						decr := 96
					end
				else
					if n = 195 then			{if the char is an accented letter, flag it and go to next iteration}
						begin
							accented := True;
							count := count + 1;
							continue
						end

					else
						if ((n >= 65) and (n <= 90)) then			{if it's a capital letter, choose d2 and see if it's only the first letter or if there are more capital letters}
							begin
								dict_p^ := d2;
								decr := 96 - 32;
								string_aux := chr($e2) + chr($a0) + (dict_p^)[n-decr];
								count_aux := count + 1;
								if count_aux > length(Line) then
									begin
										Braille_string := Braille_string + caps_signal + string_aux;
										break
									end;
								n_aux := ord(Line[count_aux]);
								while ((n_aux >= 65) and (n_aux <= 90)) do
									begin
										string_aux := string_aux + chr($e2) + chr($a0) + (dict_p^)[n_aux-decr];
										count_aux := count_aux + 1;
										if count_aux > length(Line) then
											break;
										n_aux := ord(Line[count_aux]);
									end;
								if length(string_aux) > 3 then
									Braille_string := Braille_string + caps_signal + caps_signal + string_aux
								else
									Braille_string := Braille_string + caps_signal + string_aux;
								count := count_aux;
								continue
							end
						else			{or else, choose d1}
							begin
								dict_p^ := d1;
								decr := 32
							end;

				if num and not (((n >= 48) and (n <= 57)) or (n = 46) or (n = 44)) then		{if the whole number has already been printed, change num to False again}
					num:=False;

				if not num and ((n >= 48) and (n <= 57)) then		{if it's the first number to appear, print the number signal first}
					begin
						Braille_string := Braille_string + number_signal;
						num := True;
					end;

				Braille_string := Braille_string + chr($e2) + chr($a0) + (dict_p^)[n-decr];

			count := count + 1;
			end;

			Braille := Braille_string;

			end;
	End.