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265 | -- part of OpenGLAda, (c) 2017 Felix Krause
-- released under the terms of the MIT license, see the file "COPYING"
with Ada.Characters.Handling;
with Ada.Direct_IO;
with Ada.Directories;
with Ada.Strings.Maps;
package body Tokenization is
function Case_Insensitive_Hash (S : String) return Ada.Containers.Hash_Type is
begin
return Ada.Strings.Hash (Ada.Characters.Handling.To_Lower (S));
end Case_Insensitive_Hash;
function Case_Insensitive_Equals (Left, Right : String) return Boolean is
use Ada.Characters.Handling;
begin
return To_Lower (Left) = To_Lower (Right);
end Case_Insensitive_Equals;
use Ada.Strings.Maps;
Inline_Separators : constant Character_Set :=
To_Set (Character'Val (9)) or To_Set (' ');
Newlines : constant Character_Set :=
To_Set (Character'Val (10)) or To_Set (Character'Val (13));
Separators : constant Character_Set :=
Inline_Separators or Newlines;
Single_Delimiters : constant Character_Set :=
To_Set ("&'()*+,-./:;<=>|");
Compound_Delimiters : constant array(1 .. 10) of String (1 .. 2) :=
("=>", "..", "**", ":=", "/=", ">=", "<=", "<<", ">>", "<>");
function Tokenize (File_Path : String) return Tokenizer is
File_Size : constant Natural := Natural (Ada.Directories.Size (File_Path));
subtype File_String is String (1 .. File_Size);
package File_String_IO is new Ada.Direct_IO (File_String);
File : File_String_IO.File_Type;
begin
File_String_IO.Open (File, File_String_IO.In_File, File_Path);
return Ret : Tokenizer :=
Tokenizer'(Length => File_Size, Pos => 1, Depth => 0, Cur_Line => 1,
Cur_Column => 1, others => <>) do
File_String_IO.Read (File, Ret.Input);
File_String_IO.Close (File);
Ret.Symbol_Table.Insert ("access", Keyword_Access);
Ret.Symbol_Table.Insert ("constant", Keyword_Constant);
Ret.Symbol_Table.Insert ("dynamic", Keyword_Dynamic);
Ret.Symbol_Table.Insert ("end", Keyword_End);
Ret.Symbol_Table.Insert ("function", Keyword_Function);
Ret.Symbol_Table.Insert ("in", Keyword_In);
Ret.Symbol_Table.Insert ("is", Keyword_Is);
Ret.Symbol_Table.Insert ("out", Keyword_Out);
Ret.Symbol_Table.Insert ("package", Keyword_Package);
Ret.Symbol_Table.Insert ("pragma", Keyword_Pragma);
Ret.Symbol_Table.Insert ("procedure", Keyword_Procedure);
Ret.Symbol_Table.Insert ("return", Keyword_Return);
Ret.Symbol_Table.Insert ("spec", Keyword_Spec);
Ret.Symbol_Table.Insert ("static", Keyword_Static);
Ret.Symbol_Table.Insert ("subtype", Keyword_Subtype);
Ret.Symbol_Table.Insert ("type", Keyword_Type);
Ret.Symbol_Table.Insert ("use", Keyword_Use);
Ret.Symbol_Table.Insert ("with", Keyword_With);
Ret.Symbol_Table.Insert ("wrapper", Keyword_Wrapper);
end return;
end Tokenize;
function Id (Object : in out Tokenizer; Symbol : String) return Symbol_Id is
use String_Indexer;
use type Ada.Containers.Count_Type;
Position: Cursor;
Inserted: Boolean;
begin
Object.Symbol_Table.Insert
(Symbol, Symbol_Id (Object.Symbol_Table.Length + 1), Position, Inserted);
return Element (Position);
end Id;
function Next (Object : in out Tokenizer) return Token is
I : Positive := Object.Pos;
Cur : Character;
New_Line : Positive := Object.Cur_Line;
New_Column : Positive := Object.Cur_Column;
function Next_Char return Character is
begin
return Ret : constant Character := Object.Input (I) do
I := I + 1;
if Ret = Character'Val (10) then -- Linefeed
New_Line := New_Line + 1;
New_Column := 1;
else
New_Column := New_Column + 1;
end if;
end return;
end Next_Char;
procedure Update_Pos is
begin
Object.Pos := I;
Object.Cur_Line := New_Line;
Object.Cur_Column := New_Column;
end Update_Pos;
procedure Skip (Set : Character_Set) is
begin
while I <= Object.Input'Length loop
exit when not Is_In (Object.Input (I), Set);
Cur := Next_Char;
end loop;
end Skip;
begin
Skip (Separators);
Update_Pos;
Object.Prev_Line := Object.Cur_Line;
Object.Prev_Column := Object.Cur_Column;
if I > Object.Input'Length then
return Token'(Kind => Stream_End, Length => 0,
Start => Object.Pos, Content => "");
end if;
Cur := Next_Char;
if Is_In (Cur, Single_Delimiters) then
if I <= Object.Input'Length then
declare
Next : constant Character := Object.Input (I);
begin
if Cur = '-' and Next = '-' then
Cur := Next_Char; -- properly advance I/line/column
Skip (not Newlines);
return Ret : constant Token :=
Token'(Kind => Comment, Length => I - Object.Pos - 2,
Start => Object.Pos + 2,
Content => Object.Input (Object.Pos + 2 .. I - 1)) do
Update_Pos;
end return;
else
declare
Possible_Compound : constant String := Cur & Next;
begin
for J in 1 .. 10 loop
if Compound_Delimiters (J) = Possible_Compound then
Cur := Next_Char; -- properly advace I/line/column
return Ret : constant Token :=
Token'(Kind => Delimiter, Length => 2,
Start => Object.Pos,
Content => Possible_Compound) do
Update_Pos;
end return;
end if;
end loop;
if Cur = '(' then
Object.Depth := Object.Depth + 1;
elsif Cur = ')' then
if Object.Depth = 0 then
raise Tokenization_Error with "Extra `)`!";
end if;
Object.Depth := Object.Depth - 1;
end if;
return Ret : constant Token :=
Token'(Kind => Delimiter, Length => 1, Start => Object.Pos,
Content => (1 => Cur)) do
Update_Pos;
end return;
end;
end if;
end;
else
return Ret : constant Token :=
Token'(Kind => Delimiter, Length => 1,
Start => Object.Pos, Content => (1 => Cur)) do
Update_Pos;
end return;
end if;
elsif Cur = '"' then
while I <= Object.Input'Length loop
<<continue>>
Cur := Next_Char;
if Cur = '"' then
if I <= Object.Input'Length then
if Object.Input (I) = '"' then
Cur := Next_Char; -- properly advance I/line/column
goto continue;
end if;
end if;
return Ret : constant Token :=
Token'(Kind => String_Literal, Length => I - Object.Pos - 2,
Start => Object.Pos + 1,
Content => Object.Input (Object.Pos + 1 .. I - 2)) do
Update_Pos;
end return;
end if;
end loop;
raise Tokenization_Error with "Unclosed string literal";
else
Skip (not (Separators or Single_Delimiters));
return Ret : Token :=
Token'(Kind => Identifier, Length => I - Object.Pos,
Start => Object.Pos,
Content => Object.Input (Object.Pos .. I - 1),
Id => <>) do
Ret.Id := Id (Object, Ret.Content);
Update_Pos;
end return;
end if;
end Next;
function Paren_Depth (Object : Tokenizer) return Natural is
begin
return Object.Depth;
end Paren_Depth;
function Line (Object : Tokenizer) return Positive is (Object.Prev_Line);
function Column (Object : Tokenizer) return Positive is (Object.Prev_Column);
function To_String (T : Token) return String is
begin
if T.Kind = Identifier and then Is_Keyword (T.Id) then
return "KEYWORD'(""" & T.Content & """)";
else
return T.Kind'Img & "'(""" & T.Content & """)";
end if;
end To_String;
function Input_Substring (Object : Tokenizer; From, To : Token) return String is
(Object.Input (From.Start .. To.Start + To.Content'Length - 1));
function Is_Keyword (Id : Symbol_Id) return Boolean is
(Id < Keyword_Wrapper);
function Copy (T : Token) return Token is
begin
case T.Kind is
when Identifier =>
return Token'(Kind => Identifier, Length => T.Length,
Start => T.Start, Content => T.Content, Id => T.Id);
when Numeric_Literal =>
return Token'(Kind => Numeric_Literal, Length => T.Length,
Start => T.Start, Content => T.Content);
when String_Literal =>
return Token'(Kind => String_Literal, Length => T.Length,
Start => T.Start, Content => T.Content);
when Delimiter =>
return Token'(Kind => Delimiter, Length => T.Length,
Start => T.Start, Content => T.Content);
when Comment =>
return Token'(Kind => Comment, Length => T.Length,
Start => T.Start, Content => T.Content);
when Stream_End =>
return Token'(Kind => Stream_End, Length => 0,
Start => T.Start, Content => "");
end case;
end Copy;
procedure Register_Symbol (Object : in out Tokenizer; Symbol : String;
New_Id : out Symbol_Id) is
begin
New_Id := Id (Object, Symbol);
end Register_Symbol;
end Tokenization;
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