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407 | -- Copyright (c) 1990 Regents of the University of California.
-- All rights reserved.
--
-- This software was developed by John Self of the Arcadia project
-- at the University of California, Irvine.
--
-- Redistribution and use in source and binary forms are permitted
-- provided that the above copyright notice and this paragraph are
-- duplicated in all such forms and that any documentation,
-- advertising materials, and other materials related to such
-- distribution and use acknowledge that the software was developed
-- by the University of California, Irvine. The name of the
-- University may not be used to endorse or promote products derived
-- from this software without specific prior written permission.
-- THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
-- IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
-- WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
-- TITLE skeleton manager
-- AUTHOR: John Self (UCI)
-- DESCRIPTION outputs skeleton sections when called by gen.
-- NOTES allows use of internal or external skeleton
-- $Header: /dc/uc/self/arcadia/aflex/ada/src/RCS/skeleton_managerB.a,v 1.19 1992/12/29 22:46:15 self Exp self $
with Ada.Strings.Wide_Wide_Unbounded.Wide_Wide_Text_IO;
with Ada.Wide_Wide_Text_IO;
with MISC_DEFS;
package body Skeleton_Manager is
use Ada.Strings.Wide_Wide_Unbounded;
use Ada.Strings.Wide_Wide_Unbounded.Wide_Wide_Text_IO;
use Ada.Wide_Wide_Text_IO;
function "+" (Item : Wide_Wide_String) return Unbounded_Wide_Wide_String
renames To_Unbounded_Wide_Wide_String;
Use_External_Skeleton : Boolean := False;
-- are we using an external skelfile?
Current_Line : Integer := 1;
type File_Array is array (Positive range <>) of Unbounded_Wide_Wide_String;
Skel_Template : constant File_Array := (
-- START OF SKELETON
-- START OF S1
+"-- A lexical scanner generated by aflex",
+"%% user's code up to the double pound goes right here",
+"%% user's code up to the double pound goes right here",
-- BEGIN S2
+" function YYLex return Token is",
+"",
+" subtype short is Integer range -32768..32767;",
+"",
+" yy_act : Integer;",
+" yy_c : short;",
+"",
+" -- returned upon end-of-file",
+" YY_END_TOK : constant Integer := 0;",
+"%% tables get generated here.",
-- BEGIN S3
+"",
+" -- copy whatever the last rule matched to the standard output",
+"",
+" procedure ECHO is",
+" begin",
+" if Ada.Wide_Wide_Text_IO.Is_Open (User_Output_File) then",
+" Ada.Wide_Wide_Text_IO.Put (User_Output_File, YYText);",
+"",
+" else",
+" Ada.Wide_Wide_Text_IO.Put (YYText);",
+" end if;",
+" end ECHO;",
+"",
+" -- enter a start condition.",
+" -- Using procedure requires a () after the ENTER, but makes",
+" -- everything much neater.",
+"",
+" procedure ENTER (State : Integer) is",
+" begin",
+" YY_Start := 1 + 2 * State;",
+" end ENTER;",
+" pragma Inline (ENTER);",
+"",
+" -- action number for EOF rule of a given start state",
+"function YY_STATE_EOF(state : Integer) return Integer is",
+"begin",
+" return YY_END_OF_BUFFER + state + 1;",
+"end YY_STATE_EOF;",
+"pragma Inline (YY_STATE_EOF);",
+"",
+"-- return all but the first 'n' matched characters back to the input stream",
+"procedure yyless(n : Integer) is",
+"begin",
+" yy_cp := yy_bp + n;",
+" yy_c_buf_p := yy_cp;",
+" YY_DO_BEFORE_ACTION; -- set up yytext again",
+"end yyless;",
+"pragma Inline (yyless);",
+"",
+"-- redefine this if you have something you want each time.",
+"procedure YY_USER_ACTION is",
+"begin",
+" null;",
+"end;",
+"pragma Inline (YY_USER_ACTION);",
+"",
+" -- yy_get_previous_state - get the state just before the EOB char",
+" -- was reached",
+"",
+" function YY_Get_Previous_State return YY_State_Type is",
+" YY_Current_State : YY_State_Type;",
+" YY_C : Short;",
+" Index : Integer;",
+" Code : Wide_Wide_Character;",
+"%% a local declaration of yy_bp goes here if bol_needed",
+"begin",
+"%% code to get the start state into yy_current_state goes here",
-- BEGIN S3A
+"",
--+" for yy_cp in yytext_ptr..yy_c_buf_p - 1 loop",
+" declare",
+" yy_cp : integer := yytext_ptr;",
+"",
+" begin",
+" while yy_cp < yy_c_buf_p loop",
+" Index := yy_cp;",
+"",
+"%% code to find the next state goes here",
-- BEGIN S4
+" yy_cp := Index;",
+" end loop;",
+" end;",
+"",
+" return yy_current_state;",
+"end yy_get_previous_state;",
+"",
+" procedure YYRestart (Input_File : Ada.Wide_Wide_Text_IO.File_Type) is",
+" begin",
+" Open_Input (Ada.Wide_Wide_Text_IO.Name (Input_File));",
+" end YYRestart;",
+"",
+" Index : Integer;",
+" Code : Wide_Wide_Character;",
+"",
+" begin -- of YYLex",
+"<<new_file>>",
+" -- This is where we enter upon encountering an end-of-file and",
+" -- yywrap() indicating that we should continue processing",
+"",
+" if ( yy_init ) then",
+" if ( yy_start = 0 ) then",
+" yy_start := 1; -- first start state",
+" end if;",
+"",
+" -- we put in the '\n' and start reading from [1] so that an",
+" -- initial match-at-newline will be true.",
+"",
+" yy_ch_buf.data (0) := Ada.Characters.Wide_Wide_Latin_1.LF;",
+" yy_n_chars := 1;",
+"",
+" -- we always need two end-of-buffer characters. The first causes",
+" -- a transition to the end-of-buffer state. The second causes",
+" -- a jam in that state.",
+"",
+" yy_ch_buf.data (yy_n_chars) := YY_END_OF_BUFFER_CHAR;",
+" yy_ch_buf.data (yy_n_chars + 1) := YY_END_OF_BUFFER_CHAR;",
+"",
+" yy_eof_has_been_seen := false;",
+"",
+" yytext_ptr := 1;",
+" yy_c_buf_p := yytext_ptr;",
+" yy_init := false;",
+"-- UMASS CODES :",
+"-- Initialization",
+" tok_begin_line := 1;",
+" tok_end_line := 1;",
+" tok_begin_col := 0;",
+" tok_end_col := 0;",
+" token_at_end_of_line := false;",
+" line_number_of_saved_tok_line1 := 0;",
+" line_number_of_saved_tok_line2 := 0;",
+"-- END OF UMASS CODES.",
+" end if; -- yy_init",
+"",
+" loop -- loops until end-of-file is reached",
+"",
+"-- UMASS CODES :",
+"-- if last matched token is end_of_line, we must",
+"-- update the token_end_line and reset tok_end_col.",
+" if Token_At_End_Of_Line then",
+" Tok_End_Line := Tok_End_Line + 1;",
+" Tok_End_Col := 0;",
+" Token_At_End_Of_Line := False;",
+" end if;",
+"-- END OF UMASS CODES.",
+"",
+" yy_cp := yy_c_buf_p;",
+"",
+" -- yy_bp points to the position in yy_ch_buf of the start of the",
+" -- current run.",
+"%%",
-- BEGIN S5
+"",
+"<<next_action>>",
+"%% call to gen_find_action goes here",
-- BEGIN S6
+" YY_DO_BEFORE_ACTION;",
+" YY_USER_ACTION;",
+"",
+" if Aflex_Debug then",
+" -- output acceptance info. for (-d) debug mode",
+"",
+" Ada.Wide_Wide_Text_IO.Put",
+" (Ada.Wide_Wide_Text_IO.Standard_Error,",
+" ""--accepting rule #"" );",
+" Ada.Wide_Wide_Text_IO.Put",
+" (Ada.Wide_Wide_Text_IO.Standard_Error,",
+" Integer'Wide_Wide_Image (YY_Act));",
+" Ada.Wide_Wide_Text_IO.Put_Line",
+" (Ada.Wide_Wide_Text_IO.Standard_Error,",
+" ""("""""" & yytext & """""")"");",
+" end if;",
+"",
+"-- UMASS CODES :",
+"-- Update tok_begin_line, tok_end_line, tok_begin_col and tok_end_col",
+"-- after matching the token.",
+" if yy_act /= YY_END_OF_BUFFER and then yy_act /= 0 then",
+"-- Token are matched only when yy_act is not yy_end_of_buffer or 0.",
+" Tok_Begin_Line := Tok_End_Line;",
+" Tok_Begin_Col := Tok_End_Col + 1;",
+" Tok_End_Col := Tok_Begin_Col + yy_cp - yy_bp - 1;",
+" if Current (yy_ch_buf, yy_bp) = Ada.Characters.Wide_Wide_Latin_1.LF then",
+" Token_At_End_Of_Line := True;",
+" end if;",
+" end if;",
+"-- END OF UMASS CODES.",
+"",
+"<<do_action>> -- this label is used only to access EOF actions",
+" case yy_act is",
+"%% actions go here",
-- BEGIN S7
+"",
+" when YY_END_OF_BUFFER =>",
+" yytext_ptr := yy_bp;",
+"",
+" case yy_get_next_buffer is",
+" when EOB_ACT_END_OF_FILE =>",
+" begin",
+" if yywrap then",
+" -- note: because we've taken care in",
+" -- yy_get_next_buffer() to have set up yytext,",
+" -- we can now set up yy_c_buf_p so that if some",
+" -- total hoser (like aflex itself) wants",
+" -- to call the scanner after we return the",
+" -- End_Of_Input, it'll still work - another",
+" -- End_Of_Input will get returned.",
+"",
+" yy_c_buf_p := yytext_ptr;",
+" yy_act := YY_STATE_EOF ((yy_start - 1) / 2);",
+"",
+" goto do_action;",
+"",
+" else",
+" -- start processing a new file",
+"",
+" yy_init := true;",
+"",
+" goto new_file;",
+" end if;",
+" end;",
+"",
+" when EOB_ACT_RESTART_SCAN =>",
+" yy_c_buf_p := yytext_ptr;",
+"",
+" when EOB_ACT_LAST_MATCH =>",
+" yy_c_buf_p := yy_n_chars;",
+" yy_current_state := yy_get_previous_state;",
+"",
+" yy_cp := yy_c_buf_p;",
+" yy_bp := yytext_ptr;",
+"",
+" goto next_action;",
+" end case; -- case yy_get_next_buffer()",
+"",
+" when others =>",
+" Ada.Wide_Wide_Text_IO.Put (""action # "");",
+" Ada.Wide_Wide_Text_IO.Put (Integer'Wide_Wide_Image (yy_act));",
+" Ada.Wide_Wide_Text_IO.New_Line;",
+"",
+" raise AFLEX_INTERNAL_ERROR;",
+" end case; -- case (yy_act)",
+" end loop; -- end of loop waiting for end of file",
+" end YYLex;",
+"%%",
+"ERROR tried to output beyond end of skeleton file"
-- END OF SKELETON
);
-- set_external_skeleton
--
-- DESCRIPTION
-- sets flag so we know to use an external skelfile
procedure SET_EXTERNAL_SKELETON is
begin
USE_EXTERNAL_SKELETON := TRUE;
end SET_EXTERNAL_SKELETON;
------------------
-- Get_Internal --
------------------
procedure Get_Internal (Buffer : in out Unbounded_Wide_Wide_String) is
begin
Buffer := Skel_Template (Current_Line);
Current_Line := Current_Line + 1;
end Get_Internal;
------------------
-- Get_External --
------------------
procedure Get_External (Buffer : in out Unbounded_Wide_Wide_String) is
begin
Get_Line (Misc_Defs.SkelFile, Buffer);
end Get_External;
-- end_of_skeleton
--
-- DESCRIPTION
-- returns true if there are no more lines left to output in the skeleton
function END_OF_SKELETON return BOOLEAN is
begin
if (USE_EXTERNAL_SKELETON) then
-- we're using an external skelfile
return END_OF_FILE (MISC_DEFS.SKELFILE);
else
-- internal skeleton
return CURRENT_LINE > SKEL_TEMPLATE'LAST;
end if;
end END_OF_SKELETON;
-------------------
-- Get_File_Line --
-------------------
procedure Get_File_Line (Buffer : in out Unbounded_Wide_Wide_String) is
begin
if Use_External_Skeleton then
Get_External (Buffer);
else
Get_Internal (Buffer);
end if;
end Get_File_Line;
--------------
-- Skel_Out --
--------------
procedure Skel_Out is
-- UMASS CODES :
Umass_Codes : Boolean := False;
-- Indicates whether or not current line of the template
-- is the Umass codes.
-- END OF UMASS CODES.
Buf : Unbounded_Wide_Wide_String;
begin
while not End_Of_Skeleton loop
Get_File_Line (Buf);
if Length (Buf) >= 2 and then Slice (Buf, 1, 2) = "%%" then
exit;
else
-- UMASS CODES :
-- In the template, the codes between "-- UMASS CODES : " and
-- "-- END OF UMASS CODES." are specific to be used by Ayacc
-- extension. Ayacc extension has more power in error recovery.
-- So we generate those codes only when Ayacc_Extension_Flag is True.
if Buf = "-- UMASS CODES :" then
Umass_Codes := True;
end if;
if not Umass_Codes
or else Misc_Defs.Ayacc_Extension_Flag
then
Put_Line (Buf);
end if;
if Buf = "-- END OF UMASS CODES." then
Umass_Codes := False;
end if;
-- END OF UMASS CODES.
-- UCI CODES commented out :
-- The following line is commented out because it is done in Umass codes.
-- FILE_STRING.PUT_LINE(BUF);
end if;
end loop;
end Skel_Out;
end Skeleton_Manager;
|