(*
    Copyright 2021 Anton Krotov

    This file is part of CEdit.

    CEdit 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 of the License, or
    (at your option) any later version.

    CEdit 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 CEdit. If not, see <http://www.gnu.org/licenses/>.
*)

MODULE Utils;

IMPORT SYSTEM;

CONST

    SPACE* = 20X;
    SLASH* = "/";

    OS* = "KOS";


PROCEDURE streq* (s1, s2: INTEGER; n: INTEGER): BOOLEAN;
VAR
    c1, c2: WCHAR;
BEGIN
    WHILE n > 0 DO
        SYSTEM.GET(s1, c1);
        SYSTEM.GET(s2, c2);
        INC(s1, 2);
        INC(s2, 2);
        IF c1 = c2 THEN
            DEC(n)
        ELSE
            n := 0
        END
    END
    RETURN c1 = c2
END streq;


PROCEDURE append* (VAR s1: ARRAY OF WCHAR; s2: ARRAY OF WCHAR);
VAR
    n1, n2, i, j: INTEGER;
BEGIN
    n1 := LENGTH(s1);
    n2 := LENGTH(s2);

    ASSERT(n1 + n2 < LEN(s1));

    i := 0;
    j := n1;
    WHILE i < n2 DO
        s1[j] := s2[i];
        INC(i);
        INC(j)
    END;

    s1[j] := 0X
END append;


PROCEDURE append8* (VAR s1: ARRAY OF CHAR; s2: ARRAY OF CHAR);
VAR
    n1, n2, i, j: INTEGER;
BEGIN
    n1 := LENGTH(s1);
    n2 := LENGTH(s2);

    ASSERT(n1 + n2 < LEN(s1));

    i := 0;
    j := n1;
    WHILE i < n2 DO
        s1[j] := s2[i];
        INC(i);
        INC(j)
    END;

    s1[j] := 0X
END append8;


PROCEDURE reverse* (VAR s: ARRAY OF WCHAR);
VAR
    ch: WCHAR;
    i, j: INTEGER;
BEGIN
    i := 0;
    j := LENGTH(s) - 1;
    WHILE i < j DO
        ch := s[i];
        s[i] := s[j];
        s[j] := ch;
        INC(i);
        DEC(j)
    END
END reverse;


PROCEDURE reverse8* (VAR s: ARRAY OF CHAR);
VAR
    ch: CHAR;
    i, j: INTEGER;
BEGIN
    i := 0;
    j := LENGTH(s) - 1;
    WHILE i < j DO
        ch := s[i];
        s[i] := s[j];
        s[j] := ch;
        INC(i);
        DEC(j)
    END
END reverse8;


PROCEDURE int2str* (val: INTEGER; VAR s: ARRAY OF WCHAR);
VAR
    i: INTEGER;
BEGIN
    i := 0;
    REPEAT
        s[i] := WCHR(ORD("0") + val MOD 10);
        INC(i);
        val := val DIV 10
    UNTIL val = 0;
    s[i] := 0X;
    reverse(s)
END int2str;


PROCEDURE isDigit* (ch: WCHAR): BOOLEAN;
    RETURN ("0" <= ch) & (ch <= "9")
END isDigit;


PROCEDURE isHex* (ch: WCHAR): BOOLEAN;
    RETURN ("0" <= ch) & (ch <= "9") OR ("A" <= ch) & (ch <= "F")
END isHex;


PROCEDURE isLetter* (ch: WCHAR): BOOLEAN;
    RETURN ("a" <= ch) & (ch <= "z") OR ("A" <= ch) & (ch <= "Z")
END isLetter;


PROCEDURE cap* (VAR ch: WCHAR): BOOLEAN;
VAR
    res: BOOLEAN;
BEGIN
    IF ("a" <= ch) & (ch <= "z") THEN
        ch := WCHR(ORD(ch) - (ORD("z") - ORD("Z")));
        res := TRUE
    ELSIF (430H <= ORD(ch)) & (ORD(ch) <= 44FH) THEN
        ch := WCHR(ORD(ch) - 20H);
        res := TRUE
    ELSIF (450H <= ORD(ch)) & (ORD(ch) <= 45FH) THEN
        ch := WCHR(ORD(ch) - 50H);
        res := TRUE
    ELSIF ch = 491X THEN
        ch := 490X;
        res := TRUE
    ELSE
        res := FALSE
    END
    RETURN res
END cap;


PROCEDURE cap8 (VAR ch: CHAR): BOOLEAN;
VAR
    res: BOOLEAN;
BEGIN
    IF ("a" <= ch) & (ch <= "z") THEN
        ch := CHR(ORD(ch) - (ORD("z") - ORD("Z")));
        res := TRUE
    ELSE
        res := FALSE
    END
    RETURN res
END cap8;


PROCEDURE upcase* (VAR s: ARRAY OF CHAR);
VAR
    i: INTEGER;
BEGIN
    i := LENGTH(s) - 1;
    WHILE i >= 0 DO
        IF cap8(s[i]) THEN
        END;
        DEC(i)
    END
END upcase;


PROCEDURE upcase16* (VAR s: ARRAY OF WCHAR);
VAR
    i: INTEGER;
BEGIN
    i := LENGTH(s) - 1;
    WHILE i >= 0 DO
        IF cap(s[i]) THEN
        END;
        DEC(i)
    END
END upcase16;


PROCEDURE low* (VAR ch: WCHAR): BOOLEAN;
VAR
    res: BOOLEAN;
BEGIN
    IF ("A" <= ch) & (ch <= "Z") THEN
        ch := WCHR(ORD(ch) + (ORD("z") - ORD("Z")));
        res := TRUE
    ELSIF (410H <= ORD(ch)) & (ORD(ch) <= 42FH) THEN
        ch := WCHR(ORD(ch) + 20H);
        res := TRUE
    ELSIF (400H <= ORD(ch)) & (ORD(ch) <= 40FH) THEN
        ch := WCHR(ORD(ch) + 50H);
        res := TRUE
    ELSIF ch = 490X THEN
        ch := 491X;
        res := TRUE
    ELSE
        res := FALSE
    END
    RETURN res
END low;


PROCEDURE lowcase* (VAR s: ARRAY OF CHAR);
VAR
    i: INTEGER;
BEGIN
    i := LENGTH(s) - 1;
    WHILE i >= 0 DO
        IF ("A" <= s[i]) & (s[i] <= "Z") THEN
        	s[i] := CHR(ORD(s[i]) + 32)
        END;
        DEC(i)
    END
END lowcase;


PROCEDURE str2int* (s: ARRAY OF WCHAR; VAR val: INTEGER): BOOLEAN;
VAR
    i, temp: INTEGER;
    res, neg: BOOLEAN;
BEGIN
    temp := 0;
    res := TRUE;
    neg := FALSE;
    i := 0;
    WHILE (s[i] # 0X) & (s[i] = SPACE) DO
        INC(i)
    END;

    IF s[i] = "-" THEN
        INC(i);
        neg := TRUE
    ELSIF s[i] = "+" THEN
        INC(i)
    END;

    IF isDigit(s[i]) THEN
        REPEAT
            temp := temp*10 + ORD(s[i]) - ORD("0");
            INC(i)
        UNTIL ~isDigit(s[i]);
        IF neg THEN
            temp := -temp
        END;
        val := temp
    ELSE
        res := FALSE
    END

    RETURN res
END str2int;


PROCEDURE getFileName* (path: ARRAY OF CHAR; VAR name: ARRAY OF CHAR; ch: CHAR);
VAR
    i, j: INTEGER;
BEGIN
    j := 0;
    i := LENGTH(path) - 1;
    WHILE (i >= 0) & (path[i] # ch) DO
        name[j] := path[i];
        DEC(i);
        INC(j)
    END;
    name[j] := 0X;
    reverse8(name)
END getFileName;


PROCEDURE getPath* (fname: ARRAY OF CHAR; VAR path: ARRAY OF CHAR);
VAR
    i, j: INTEGER;
BEGIN
    j := 0;
    i := LENGTH(fname) - 1;
    WHILE (i >= 0) & (fname[i] # SLASH) DO
        DEC(i)
    END;
    path := fname;
    path[i] := 0X
END getPath;


PROCEDURE lg10* (n: INTEGER): INTEGER;
VAR
    res: INTEGER;
BEGIN
    res := 0;
    WHILE n >= 10 DO
        n := n DIV 10;
        INC(res)
    END
    RETURN res
END lg10;


PROCEDURE sgn* (x: INTEGER): INTEGER;
BEGIN
    IF x > 0 THEN
        x := 1
    ELSIF x < 0 THEN
        x := -1
    ELSE
        x := 0
    END
    RETURN x
END sgn;


PROCEDURE ptr2str* (ptr: INTEGER; VAR s: ARRAY OF CHAR);
VAR
    i, n: INTEGER;
BEGIN
    i := -1;
    n := LEN(s) - 1;
    REPEAT
        INC(i);
        SYSTEM.GET(ptr, s[i]);
        INC(ptr)
    UNTIL (i = n) OR (s[i] = 0X);
    s[i] := 0X
END ptr2str;


PROCEDURE between* (a, b, c: INTEGER): BOOLEAN;
	RETURN (a <= b) & (b <= c)
END between;


END Utils.