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(* mcComment.mod provides a module to remember the comments.
Copyright (C) 2015-2025 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
This file is part of GNU Modula-2.
GNU Modula-2 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Modula-2 is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Modula-2; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. *)
IMPLEMENTATION MODULE mcComment ; (*!m2pim*)
FROM DynamicStrings IMPORT String, InitString, ConCat, RemoveWhitePrefix, Mark, KillString, InitStringCharStar, EqualCharStar, Length, Slice, string, char ;
FROM Storage IMPORT ALLOCATE ;
FROM nameKey IMPORT Name, keyToCharStar, lengthKey, NulName ;
FROM mcDebug IMPORT assert ;
FROM ASCII IMPORT nl ;
FROM libc IMPORT printf ;
TYPE
commentType = (unknown, procedureHeading, inBody, afterStatement) ;
commentDesc = POINTER TO RECORD
type : commentType ;
content : String ;
procName: Name ;
used : BOOLEAN ;
END ;
(*
isProcedureComment - returns TRUE if, cd, is a procedure comment.
*)
PROCEDURE isProcedureComment (cd: commentDesc) : BOOLEAN ;
BEGIN
RETURN (cd # NIL) AND (cd^.type = procedureHeading)
END isProcedureComment;
(*
isBodyComment - returns TRUE if, cd, is a body comment.
*)
PROCEDURE isBodyComment (cd: commentDesc) : BOOLEAN ;
BEGIN
RETURN (cd # NIL) AND (cd^.type = inBody)
END isBodyComment;
(*
isAfterComment - returns TRUE if, cd, is an after comment.
*)
PROCEDURE isAfterComment (cd: commentDesc) : BOOLEAN ;
BEGIN
RETURN (cd # NIL) AND (cd^.type = afterStatement)
END isAfterComment;
(*
initComment - the start of a new comment has been seen by the lexical analyser.
A new comment block is created and all addText contents are placed
in this block. onlySpaces indicates whether we have only seen
spaces on this line.
*)
PROCEDURE initComment (onlySpaces: BOOLEAN) : commentDesc ;
VAR
cd: commentDesc ;
BEGIN
NEW (cd) ;
assert (cd # NIL) ;
WITH cd^ DO
IF onlySpaces
THEN
type := inBody
ELSE
type := afterStatement
END ;
content := InitString ('') ;
procName := NulName ;
used := FALSE
END ;
RETURN cd
END initComment ;
(*
addText - cs is a C string (null terminated) which contains comment text.
This is appended to the comment, cd.
*)
PROCEDURE addText (cd: commentDesc; cs: ADDRESS) ;
BEGIN
IF cd # NIL
THEN
cd^.content := ConCat (cd^.content, InitStringCharStar (cs))
END
END addText ;
(*
Min - returns the lower of, a, and, b.
*)
PROCEDURE Min (a, b: CARDINAL) : CARDINAL ;
BEGIN
IF a < b
THEN
RETURN a
ELSE
RETURN b
END
END Min ;
(*
RemoveNewlines -
*)
PROCEDURE RemoveNewlines (s: String) : String ;
BEGIN
WHILE Length (s) > 0 DO
IF char (s, 0) = nl
THEN
s := RemoveWhitePrefix (Slice (s, 1, 0))
ELSE
RETURN RemoveWhitePrefix (s)
END
END ;
RETURN s
END RemoveNewlines ;
(*
seenProcedure - returns TRUE if the name, procName, appears as the first word
in the comment.
*)
PROCEDURE seenProcedure (cd: commentDesc; procName: Name) : BOOLEAN ;
VAR
s : String ;
a : ADDRESS ;
i, h: CARDINAL ;
res : BOOLEAN ;
BEGIN
a := keyToCharStar (procName) ;
s := RemoveNewlines (cd^.content) ;
s := Slice (Mark (s), 0, Min (Length (s), lengthKey (procName))) ;
res := EqualCharStar (s, a) ;
s := KillString (s) ;
RETURN res
END seenProcedure ;
(*
setProcedureComment - changes the type of comment, cd, to a
procedure heading comment,
providing it has the procname as the first word.
*)
PROCEDURE setProcedureComment (cd: commentDesc; procname: Name) ;
BEGIN
IF cd # NIL
THEN
IF seenProcedure (cd, procname)
THEN
cd^.type := procedureHeading ;
cd^.procName := procname
END
END
END setProcedureComment ;
(*
getContent - returns the content of comment, cd.
*)
PROCEDURE getContent (cd: commentDesc) : String ;
BEGIN
IF cd # NIL
THEN
RETURN cd^.content
END ;
RETURN NIL
END getContent ;
(*
getCommentCharStar - returns the C string content of comment, cd.
*)
PROCEDURE getCommentCharStar (cd: commentDesc) : ADDRESS ;
VAR
s: String ;
BEGIN
s := getContent (cd) ;
IF s = NIL
THEN
RETURN NIL
ELSE
RETURN string (s)
END
END getCommentCharStar ;
(*
getProcedureComment - returns the current procedure comment if available.
*)
PROCEDURE getProcedureComment (cd: commentDesc) : String ;
BEGIN
IF (cd^.type = procedureHeading) AND (NOT cd^.used)
THEN
cd^.used := TRUE ;
RETURN cd^.content
END ;
RETURN NIL
END getProcedureComment ;
(*
getAfterStatementComment - returns the current statement after comment if available.
*)
PROCEDURE getAfterStatementComment (cd: commentDesc) : String ;
BEGIN
IF (cd^.type = afterStatement) AND (NOT cd^.used)
THEN
cd^.used := TRUE ;
RETURN cd^.content
END ;
RETURN NIL
END getAfterStatementComment ;
(*
getInbodyStatementComment - returns the current statement after comment if available.
*)
PROCEDURE getInbodyStatementComment (cd: commentDesc) : String ;
BEGIN
IF (cd^.type = inBody) AND (NOT cd^.used)
THEN
cd^.used := TRUE ;
RETURN cd^.content
END ;
RETURN NIL
END getInbodyStatementComment ;
(*
dumpComment -
*)
PROCEDURE dumpComment (cd: commentDesc) ;
BEGIN
printf ("comment : ");
WITH cd^ DO
CASE type OF
unknown : printf ("unknown") |
procedureHeading: printf ("procedureheading") |
inBody : printf ("inbody") |
afterStatement : printf ("afterstatement")
END ;
IF used
THEN
printf (" used")
ELSE
printf (" unused")
END ;
printf (" contents = %s\n", string (content))
END
END dumpComment ;
END mcComment.
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