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(* Strings.mod provides a Logitech-3.0 compatible library.
Copyright (C) 2005-2025 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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. *)
IMPLEMENTATION MODULE Strings ;
FROM ASCII IMPORT nul ;
IMPORT StrLib ;
IMPORT DynamicStrings ;
(*
Assign - source := dest.
*)
PROCEDURE Assign (VAR dest: ARRAY OF CHAR; source: ARRAY OF CHAR) ;
BEGIN
StrLib.StrCopy(source, dest)
END Assign ;
(*
Insert - insert the string, substr, into str at position, index.
substr, is added to the end of, str, if, index >= length(str)
*)
PROCEDURE Insert (substr: ARRAY OF CHAR; VAR str: ARRAY OF CHAR;
index: CARDINAL) ;
VAR
s1, s2: DynamicStrings.String ;
BEGIN
IF index>Length(str)
THEN
ConCat(str, substr, str)
ELSE
s1 := DynamicStrings.InitString(str) ;
s2 := DynamicStrings.ConCat(DynamicStrings.Slice(s1, 0, index),
DynamicStrings.Mark(DynamicStrings.InitString(str))) ;
s2 := DynamicStrings.ConCat(s2, DynamicStrings.Slice(s1, index, 0)) ;
DynamicStrings.CopyOut(str, s2) ;
s1 := DynamicStrings.KillString(s1) ;
s2 := DynamicStrings.KillString(s2)
END
END Insert ;
(*
Delete - delete len characters from, str, starting at, index.
*)
PROCEDURE Delete (VAR str: ARRAY OF CHAR; index: CARDINAL; length: CARDINAL) ;
VAR
s: DynamicStrings.String ;
BEGIN
s := DynamicStrings.InitString(str) ;
s := DynamicStrings.ConCat(DynamicStrings.Mark(DynamicStrings.Slice(s, 0, index)),
DynamicStrings.Mark(DynamicStrings.Slice(s, index+length, 0))) ;
DynamicStrings.CopyOut(str, s) ;
s := DynamicStrings.KillString(s)
END Delete ;
(*
Pos - return the first position of, substr, in, str.
*)
PROCEDURE Pos (substr, str: ARRAY OF CHAR) : CARDINAL ;
VAR
i, k, l : INTEGER ;
s1, s2, s3: DynamicStrings.String ;
BEGIN
s1 := DynamicStrings.InitString(str) ;
s2 := DynamicStrings.InitString(substr) ;
k := DynamicStrings.Length(s1) ;
l := DynamicStrings.Length(s2) ;
i := 0 ;
REPEAT
i := DynamicStrings.Index(s1, DynamicStrings.char(s2, 0), i) ;
IF i>=0
THEN
s3 := DynamicStrings.Slice(s1, i, l) ;
IF DynamicStrings.Equal(s3, s2)
THEN
s1 := DynamicStrings.KillString(s1) ;
s2 := DynamicStrings.KillString(s2) ;
s3 := DynamicStrings.KillString(s3) ;
RETURN( i )
END ;
s3 := DynamicStrings.KillString(s3)
END ;
INC(i)
UNTIL i>=k ;
s1 := DynamicStrings.KillString(s1) ;
s2 := DynamicStrings.KillString(s2) ;
s3 := DynamicStrings.KillString(s3) ;
RETURN( HIGH(str)+1 )
END Pos ;
(*
Copy - copy at most, length, characters in, substr, to, str,
starting at position, index.
*)
PROCEDURE Copy (str: ARRAY OF CHAR;
index, length: CARDINAL; VAR result: ARRAY OF CHAR) ;
VAR
s1, s2: DynamicStrings.String ;
BEGIN
s1 := DynamicStrings.InitString(str) ;
s2 := DynamicStrings.Slice(s1, index, index+length) ;
DynamicStrings.CopyOut(result, s2) ;
s1 := DynamicStrings.KillString(s1) ;
s2 := DynamicStrings.KillString(s2)
END Copy ;
(*
ConCat - concatenates two strings, s1, and, s2
and places the result into, dest.
*)
PROCEDURE ConCat (s1, s2: ARRAY OF CHAR; VAR dest: ARRAY OF CHAR) ;
BEGIN
StrLib.StrConCat(s1, s2, dest)
END ConCat ;
(*
Length - return the length of string, s.
*)
PROCEDURE Length (s: ARRAY OF CHAR) : CARDINAL ;
BEGIN
RETURN( StrLib.StrLen(s) )
END Length ;
(*
CompareStr - compare two strings, left, and, right.
*)
PROCEDURE CompareStr (left, right: ARRAY OF CHAR) : INTEGER ;
BEGIN
IF StrLib.StrLess(left, right)
THEN
RETURN( -1 )
ELSIF StrLib.StrEqual(left, right)
THEN
RETURN( 0 )
ELSE
RETURN( 1 )
END
END CompareStr ;
END Strings.
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