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tackling #include

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hyung-hwan
2021-11-12 23:31:25 +00:00
parent de3770b6ef
commit 5fcc19de27
3 changed files with 166 additions and 141 deletions
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303
lib2/h3-compilers.adb
View File

@ -8,127 +8,7 @@ package body H3.Compilers is
LB_EOF: constant S.Rune_Array := (R.V.Left_Arrow,R.V.UC_E,R.V.UC_O,R.V.UC_F,R.V.Right_Arrow); -- <EOF>
LB_XINCLUDE: constant S.Rune_Array := (R.V.Number_Sign,R.V.LC_I,R.V.LC_N,R.V.LC_C,R.V.LC_L,R.V.LC_U,R.V.LC_D,R.V.LC_E); -- #include
procedure Set_Lexer_State (C: in out Compiler; State: in Lexer_State) is
begin
C.Lx.State := State;
end Set_Lexer_State;
procedure Set_Lexer_State (C: in out Compiler; State: in Lexer_State; Ch: in R.Rune) is
begin
-- change the lexer state while storing the first character in the token buffer.
C.Lx.State := State;
S.Clear (C.Tk.Buf);
S.Append (C.Tk.Buf, Ch);
end Set_Lexer_State;
procedure Set_Lexer_State (C: in out Compiler; State: in Lexer_State; Code: in R.Code) is
begin
Set_Lexer_State (C, State, R.To_Rune(Code));
end Set_Lexer_State;
procedure Set_Parser_State (C: in out Compiler; State: in Parser_State) is
begin
C.Ps.State := State;
end Set_Parser_State;
procedure Parse_Start (C: in out Compiler) is
begin
case C.Tk.Id is
when TK_BSTR =>
null;
when TK_BYTE =>
null;
when TK_CHAR =>
null;
when TK_CSTR =>
null;
when TK_DIRECTIVE =>
if C.Tk.Buf.Equals(LB_XINCLUDE) then
Set_Parser_State (C, PS_INCLUDE);
else
raise Syntax_Error;
end if;
when TK_EOF =>
null;
when TK_EOL =>
null;
when TK_GE =>
null;
when TK_GT =>
null;
when TK_IDENT =>
null;
when TK_LE =>
null;
when TK_LT =>
null;
when TK_SEMICOLON =>
null;
end case;
end Parse_Start;
procedure Start_Inclusion (C: in out Compiler; Name: in S.Rune_Array) is
Top: System_Index;
begin
if C.St.Top = C.St.Items'Last then
raise Syntax_Error; -- TODO: inclusion depth too deep
end if;
Top := C.St.Top + 1;
Ada.Text_IO.Open (C.St.Items(Top).Handle, Ada.Text_IO.In_File, Standard.String(Utf8.From_Unicode_String(Name)));
C.St.Top := Top;
end Start_Inclusion;
procedure End_Inclusion (C: in out Compiler) is
begin
Ada.Text_IO.Close (C.St.Items(C.St.Top).Handle);
C.St.Top := C.St.Top - 1;
end End_Inclusion;
procedure Parse_Include (C: in out Compiler) is
begin
if C.Tk.Id = TK_CSTR then
-- arrange to feed more data from the included file.
Start_Inclusion (C, S.To_Rune_Array(C.Tk.Buf));
null;
else
raise Syntax_Error; -- string literal required
end if;
end Parse_Include;
procedure Parse_Include_End (C: in out Compiler) is
begin
if C.Tk.Id /= TK_SEMICOLON then
raise Syntax_Error;
end if;
-- TODO: put the state back to START???
end Parse_Include_End;
procedure Got_Token (C: in out Compiler) is
begin
--case C.P.State IS
-- when START =>
-- null;
--end case;
ada.text_io.put (C.Tk.Id'Img);
ada.text_io.put (" ");
for i in C.Tk.Buf.Get_First_Index .. C.Tk.Buf.Get_Last_Index loop
ada.text_io.put (standard.character'val(S.Rune'Pos(C.Tk.Buf.Get_Item(i))));
end loop;
ada.text_io.put_line("");
case C.Ps.State is
when PS_START =>
Parse_Start (C);
when PS_INCLUDE =>
Parse_Include (C);
when others =>
raise Syntax_Error; -- TODO: change this...
end case;
end Got_Token;
-- -------------------------------------------------------------------
procedure Start_Token (C: in out Compiler) is
begin
@ -164,6 +44,32 @@ ada.text_io.put_line("");
Feed_Token(C, R.To_Rune(Code));
end Feed_Token;
procedure Set_Lexer_State (C: in out Compiler; State: in Lexer_State) is
begin
C.Lx.State := State;
Start_Token (C); -- empty the token buffer
end Set_Lexer_State;
procedure Switch_Lexer_State (C: in out Compiler; State: in Lexer_State) is
begin
C.Lx.State := State;
-- don't reset the token buffer;
end Switch_Lexer_State;
procedure Set_Lexer_State (C: in out Compiler; State: in Lexer_State; Ch: in R.Rune) is
begin
-- change the lexer state while storing the first character in the token buffer.
C.Lx.State := State;
Start_Token (C, Ch);
end Set_Lexer_State;
procedure Set_Lexer_State (C: in out Compiler; State: in Lexer_State; Code: in R.Code) is
begin
Set_Lexer_State (C, State, R.To_Rune(Code));
end Set_Lexer_State;
procedure Got_Token (C: in out Compiler); -- defined further down
procedure End_Token (C: in out Compiler; Id: in Token_Id) is
begin
C.Tk.Id := Id;
@ -187,6 +93,112 @@ ada.text_io.put_line("");
Set_Lexer_State (C, LX_START);
end End_Token;
-- -------------------------------------------------------------------
procedure Set_Parser_State (C: in out Compiler; State: in Parser_State) is
begin
C.Ps.State := State;
end Set_Parser_State;
procedure Parse_Start (C: in out Compiler) is
begin
case C.Tk.Id is
when TK_BSTR =>
null;
when TK_BYTE =>
null;
when TK_CHAR =>
null;
when TK_CSTR =>
null;
when TK_DIRECTIVE =>
if C.Tk.Buf.Equals(LB_XINCLUDE) then
Set_Parser_State (C, PS_INCLUDE);
else
raise Syntax_Error with "unknown directive name";
end if;
when TK_EOF =>
null;
when TK_EOL =>
null;
when TK_GE =>
null;
when TK_GT =>
null;
when TK_IDENT =>
null;
when TK_LE =>
null;
when TK_LT =>
null;
when TK_SEMICOLON =>
null;
end case;
end Parse_Start;
procedure Start_Inclusion (C: in out Compiler; Name: in S.Rune_Array) is
Top: System_Index;
begin
if C.St.Top = C.St.Items'Last then
raise Syntax_Error with "inclusion depth too deep";
end if;
Top := C.St.Top + 1;
Ada.Text_IO.Open (C.St.Items(Top).Handle, Ada.Text_IO.In_File, Standard.String(Utf8.From_Unicode_String(Name)));
C.St.Top := Top;
end Start_Inclusion;
procedure End_Inclusion (C: in out Compiler) is
begin
Ada.Text_IO.Close (C.St.Items(C.St.Top).Handle);
C.St.Top := C.St.Top - 1;
end End_Inclusion;
procedure Parse_Include (C: in out Compiler) is
begin
if C.Tk.Id = TK_CSTR then
-- arrange to feed more data from the included file.
Start_Inclusion (C, S.To_Rune_Array(C.Tk.Buf));
null;
else
raise Syntax_Error with "string literal required";
end if;
end Parse_Include;
procedure Parse_Include_End (C: in out Compiler) is
begin
if C.Tk.Id /= TK_SEMICOLON then
raise Syntax_Error with "semicolon required";
end if;
-- TODO: put the state back to START???
end Parse_Include_End;
procedure Got_Token (C: in out Compiler) is
begin
--case C.P.State IS
-- when START =>
-- null;
--end case;
ada.text_io.put (C.Tk.Id'Img);
ada.text_io.put (" ");
for i in C.Tk.Buf.Get_First_Index .. C.Tk.Buf.Get_Last_Index loop
ada.text_io.put (standard.character'val(S.Rune'Pos(C.Tk.Buf.Get_Item(i))));
end loop;
ada.text_io.put_line("");
case C.Ps.State is
when PS_START =>
Parse_Start (C);
when PS_INCLUDE =>
Parse_Include (C);
when others =>
raise Syntax_Error; -- TODO: change this...
end case;
end Got_Token;
procedure Feed_Char_Code (C: in out Compiler; Code: in R.Code) is
begin
<<Start_Over>>
@ -217,7 +229,9 @@ end if;
elsif R.Is_Rune(Code, R.V.Right_Arrow) then
Set_Lexer_State (C, LX_OP_GREATER, Code);
elsif R.Is_Rune(Code, R.V.Number_Sign) then
Set_Lexer_State (C, LX_DIRECTIVE);
Set_Lexer_State (C, LX_DIRECTIVE, Code);
elsif R.Is_Rune(Code, R.V.Quotation) then -- double quote
Set_Lexer_State (C, LX_CSTR);
else
raise Syntax_Error;
end if;
@ -230,6 +244,33 @@ end if;
goto Start_Over;
end if;
when LX_COMMENT =>
null;
when LX_CSTR =>
-- TODO: escaping...
if R.Is_Rune(Code, R.V.Quotation) then
End_Token (C, TK_CSTR);
else
Feed_Token (C, Code);
end if;
when LX_IDENT =>
if R.Is_Alnum(Code) or else R.Is_Rune(Code, R.V.Underline) then
Feed_Token (C, Code);
else
End_Token (C, TK_IDENT);
goto Start_Over;
end if;
when LX_NUMBER =>
if R.Is_Digit(Code) then
Feed_Token (C, Code);
else
End_Token (C, TK_IDENT); -- TODO: change this
goto Start_Over;
end if;
when LX_OP_GREATER =>
if R.Is_Rune(Code, R.V.Equal_Sign) then
End_Token (C, TK_GE, Code);
@ -246,24 +287,6 @@ end if;
goto Start_Over;
end if;
when LX_COMMENT =>
null;
when LX_IDENT =>
if R.Is_Alnum(Code) or else R.Is_Rune(Code, R.V.Underline) then
Feed_Token (C, Code);
else
End_Token (C, TK_IDENT);
goto Start_Over;
end if;
when LX_NUMBER =>
if R.Is_Digit(Code) then
Feed_Token (C, Code);
else
End_Token (C, TK_IDENT); -- TODO: change this
goto Start_Over;
end if;
end case;
end Feed_Char_Code;

2
lib2/h3-compilers.ads
View File

@ -18,7 +18,9 @@ package H3.Compilers is
private
type Lexer_State is (
LX_START,
LX_COMMENT,
LX_CSTR,
LX_DIRECTIVE,
LX_IDENT,
LX_NUMBER,

2
lib2/hello3.adb
View File

@ -6,6 +6,6 @@ procedure hello3 is
Compiler: C.Compiler;
begin
Compiler.Feed ("#include 'abc.txt'");
Compiler.Feed ("#include ""abc.txt""");
Compiler.End_Feed;
end hello3;