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206 | with
ada.Characters.latin_1,
ada.Strings.fixed,
ada.strings.Maps;
package body lace.text.Cursor
is
use ada.Strings;
Integer_Numerals : constant maps.character_Set := maps.to_Set ("+-0123456789");
Float_Numerals : constant maps.character_Set := maps.to_Set ("+-0123456789.");
-- Forge
--
function First (of_Text : access constant Text.item) return Cursor.item
is
the_Cursor : constant Cursor.item := (of_Text.all'unchecked_Access, 1);
begin
return the_Cursor;
end First;
-- Attributes
--
function at_End (Self : in Item) return Boolean
is
begin
return Self.Current = 0;
end at_End;
function has_Element (Self : in Item) return Boolean
is
begin
return not at_End (Self)
and Self.Current <= Self.Target.Length;
end has_Element;
procedure advance (Self : in out Item; Delimiter : in String := " ";
Repeat : in Natural := 0;
skip_Delimiter : in Boolean := True)
is
begin
for Count in 1 .. Repeat + 1
loop
declare
delimiter_Position : Natural;
begin
delimiter_Position := fixed.Index (Self.Target.Data,
Delimiter,
from => Self.Current);
if delimiter_Position = 0
then
Self.Current := 0;
return;
else
if skip_Delimiter
then
Self.Current := delimiter_Position + Delimiter'Length;
elsif Count = Repeat + 1
then
Self.Current := delimiter_Position - 1;
else
Self.Current := delimiter_Position + Delimiter'Length - 1;
end if;
end if;
end;
end loop;
exception
when constraint_Error =>
raise at_end_Error;
end advance;
procedure skip_White (Self : in out Item)
is
begin
while has_Element (Self)
and then ( Self.Target.Data (Self.Current) = ' '
or Self.Target.Data (Self.Current) = ada.Characters.Latin_1.CR
or Self.Target.Data (Self.Current) = ada.Characters.Latin_1.LF
or Self.Target.Data (Self.Current) = ada.Characters.Latin_1.HT)
loop
Self.Current := Self.Current + 1;
end loop;
end skip_White;
function next_Token (Self : in out Item;
Delimiter : in Character := ' ';
Trim : in Boolean := False) return String
is
begin
return next_Token (Self, "" & Delimiter, Trim);
end next_Token;
function next_Token (Self : in out item; Delimiter : in String := " ";
Trim : in Boolean := False) return String
is
begin
if at_End (Self)
then
raise at_end_Error;
end if;
declare
use ada.Strings.fixed;
delimiter_Position : constant Natural := Index (Self.Target.Data, Delimiter, from => Self.Current);
begin
if delimiter_Position = 0
then
return the_Token : constant String := (if Trim then fixed.Trim (Self.Target.Data (Self.Current .. Self.Target.Length), Both)
else Self.Target.Data (Self.Current .. Self.Target.Length))
do
Self.Current := 0;
end return;
end if;
return the_Token : constant String := (if Trim then fixed.Trim (Self.Target.Data (Self.Current .. delimiter_Position - 1), Both)
else Self.Target.Data (Self.Current .. delimiter_Position - 1))
do
Self.Current := delimiter_Position + Delimiter'Length;
end return;
end;
end next_Token;
procedure skip_Token (Self : in out Item; Delimiter : in String := " ")
is
ignored_Token : String := Self.next_Token (Delimiter);
begin
null;
end skip_Token;
function get_Integer (Self : in out Item) return Integer
is
use ada.Strings.fixed;
Text : String (1 .. Self.Length);
First : Positive;
Last : Natural;
begin
Text := Self.Target.Data (Self.Current .. Self.Target.Length);
find_Token (Text, integer_Numerals, Inside, First, Last);
if Last = 0 then
raise No_Data_Error;
end if;
Self.Current := Self.Current + Last;
return Integer'Value (Text (First .. Last));
end get_Integer;
function get_Real (Self : in out Item) return long_Float
is
use ada.Strings.fixed;
Text : String (1 .. Self.Length);
First : Positive;
Last : Natural;
begin
Text := Self.Target.Data (Self.Current .. Self.Target.Length);
find_Token (Text, float_Numerals, Inside, First, Last);
if Last = 0 then
raise No_Data_Error;
end if;
Self.Current := Self.Current + Last;
return long_Float'Value (Text (First .. Last));
end get_Real;
function Length (Self : in Item) return Natural
is
begin
return Self.Target.Length - Self.Current + 1;
end Length;
function Peek (Self : in Item; Length : in Natural := Remaining) return String
is
Last : constant Natural := (if Length = Natural'Last then Self.Target.Length
else Self.Current + Length - 1);
begin
if at_End (Self)
then
return "";
end if;
return Self.Target.Data (Self.Current .. Last);
end Peek;
end lace.text.Cursor;
|