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(*

    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 .

*)

MODULE Lines;

IMPORT

    List, SYSTEM, API, Utils;

CONST

    WCHAR_SIZE = 2;

    SPACE* = 20X;

    TAB* = 9X;

    TAB1* = 0FFFEX;

TYPE

    tLine* = POINTER TO RECORD (List.tItem)

        ptr: INTEGER;

        length*: INTEGER;

        modified*, saved*, temp, label*: BOOLEAN;

        cin*, cout*, pos*: INTEGER

    END;

    PmovInt = PROCEDURE (VAR v: INTEGER; x: INTEGER);

    PmovBool = PROCEDURE (line: tLine; VAR v: BOOLEAN; x: BOOLEAN);

    PmovPtr = PROCEDURE (VAR v: List.tItem; x: List.tItem);

    PTypedPtr = PROCEDURE (p: List.tItem);

    PUntypedPtr = PROCEDURE (p: INTEGER);

VAR

    _movInt: PmovInt;

    _movBool, _movBool2: PmovBool;

    _movPtr: PmovPtr;

    _typedPtr: PTypedPtr;

    _untypedPtr: PUntypedPtr;

    pMaxLength, tab*: INTEGER;

    tabs*: BOOLEAN;

PROCEDURE movInt (VAR v: INTEGER; x: INTEGER);

BEGIN

    _movInt(v, x)

END movInt;

PROCEDURE movBool (line: tLine; VAR v: BOOLEAN; x: BOOLEAN);

BEGIN

    _movBool(line, v, x)

END movBool;

PROCEDURE movBool2 (line: tLine; VAR v: BOOLEAN; x: BOOLEAN);

BEGIN

    _movBool2(line, v, x)

END movBool2;

PROCEDURE movPtr (VAR v: List.tItem; x: List.tItem);

BEGIN

    _movPtr(v, x)

END movPtr;

PROCEDURE malloc (size: INTEGER): INTEGER;

VAR

    maxLength: INTEGER;

BEGIN

    ASSERT(pMaxLength # 0);

    SYSTEM.GET(pMaxLength, maxLength);

    IF size > maxLength THEN

        SYSTEM.PUT(pMaxLength, size)

    END;

    size := size*WCHAR_SIZE + 4;

    INC(size, (-size) MOD 32)

    RETURN API._NEW(size)

END malloc;

PROCEDURE free (line: tLine; newPtr: INTEGER);

BEGIN

    IF line.ptr # 0 THEN

        IF line.temp THEN

            line.ptr := API._DISPOSE(line.ptr)

        ELSE

            line.ptr := 0

        END

    END;

    IF ~line.temp THEN

        movInt(line.ptr, newPtr);

        IF newPtr # 0 THEN

            _untypedPtr(newPtr)

        END

    END;

    line.ptr := newPtr

END free;

PROCEDURE create* (temp: BOOLEAN): tLine;

VAR

    line: tLine;

BEGIN

    NEW(line);

    line.label := FALSE;

    ASSERT(line # NIL);

    IF ~temp THEN

        _typedPtr(line)

    END;

    line.next := NIL;

    line.prev := NIL;

    IF ~temp THEN

        movPtr(line.next, NIL);

        movPtr(line.prev, NIL)

    END;

    line.ptr := malloc(1);

    ASSERT(line.ptr # 0);

    IF ~temp THEN

        _untypedPtr(line.ptr);

        movInt(line.ptr, line.ptr)

    END;

    SYSTEM.PUT16(line.ptr, 0);

    line.length := 0;

    IF ~temp THEN

        movInt(line.length, 0)

    END;

    line.temp := temp;

    line.modified := FALSE;

    line.saved := FALSE;

    IF ~temp THEN

        movBool(line, line.modified, FALSE);

        movBool(line, line.saved, FALSE)

    END;

    line.cin := 0;

    line.cout := 0;

    line.pos := 0

    RETURN line

END create;

PROCEDURE destroy* (VAR line: tLine);

BEGIN

    IF line.temp THEN

        free(line, 0);

        DISPOSE(line)

    ELSE

        line := NIL

    END

END destroy;

PROCEDURE getChar* (line: tLine; i: INTEGER): WCHAR;

VAR

    c: WCHAR;

BEGIN

    SYSTEM.GET(line.ptr + i*WCHAR_SIZE, c)

    RETURN c

END getChar;

PROCEDURE tabWidth (line: tLine; pos: INTEGER): INTEGER;

VAR

    n: INTEGER;

BEGIN

    n := pos;

    IF getChar(line, pos) = TAB THEN

        INC(pos);

        WHILE getChar(line, pos) = TAB1 DO

            INC(pos)

        END

    END

    RETURN pos - n

END tabWidth;

PROCEDURE save* (line: tLine);

BEGIN

    IF ~line.temp THEN

        movBool2(line, line.saved, TRUE);

        movBool2(line, line.modified, FALSE)

    END;

    line.modified := FALSE;

    line.saved := TRUE

END save;

PROCEDURE isSpace* (c: WCHAR): BOOLEAN;

    RETURN (c = SPACE) OR (c = TAB) OR (c = TAB1)

END isSpace;

PROCEDURE trimLength* (line: tLine): INTEGER;

VAR

    i: INTEGER;

BEGIN

    i := line.length - 1;

    WHILE (i >= 0) & isSpace(getChar(line, i)) DO

        DEC(i)

    END

    RETURN i + 1

END trimLength;

PROCEDURE getPChar* (line: tLine; i: INTEGER): INTEGER;

    RETURN line.ptr + i*WCHAR_SIZE

END getPChar;

PROCEDURE setChar* (line: tLine; i: INTEGER; c: WCHAR);

BEGIN

    SYSTEM.PUT(line.ptr + i*WCHAR_SIZE, c)

END setChar;

PROCEDURE move* (src, dst: tLine);

BEGIN

    SYSTEM.MOVE(src.ptr, dst.ptr, (MIN(src.length, dst.length) + 1)*WCHAR_SIZE)

END move;

PROCEDURE concat* (line: tLine; s: ARRAY OF WCHAR);

VAR

    Len: INTEGER;

    ptr: INTEGER;

BEGIN

    Len := LENGTH(s);

    ptr := malloc(line.length + Len + 1);

    ASSERT(ptr # 0);

    SYSTEM.MOVE(line.ptr, ptr, line.length*WCHAR_SIZE);

    SYSTEM.MOVE(SYSTEM.ADR(s[0]), ptr + line.length*WCHAR_SIZE, Len*WCHAR_SIZE);

    SYSTEM.PUT16(ptr + (line.length + Len)*WCHAR_SIZE, 0);

    IF ~line.temp THEN

        movInt(line.length, line.length + Len)

    END;

    INC(line.length, Len);

    free(line, ptr)

END concat;

PROCEDURE delChar* (line: tLine; pos: INTEGER);

VAR

    ptr: INTEGER;

BEGIN

    IF pos < line.length THEN

        ptr := malloc(line.length);

        ASSERT(ptr # 0);

        IF ~line.temp THEN

            movInt(line.length, line.length - 1)

        END;

        DEC(line.length);

        SYSTEM.MOVE(line.ptr, ptr, pos*WCHAR_SIZE);

        SYSTEM.MOVE(line.ptr + pos*WCHAR_SIZE + WCHAR_SIZE, ptr + pos*WCHAR_SIZE, (line.length - pos)*WCHAR_SIZE);

        SYSTEM.PUT16(ptr + line.length*WCHAR_SIZE, 0);

        free(line, ptr)

    END

END delChar;

PROCEDURE insert* (line: tLine; pos: INTEGER; c: WCHAR);

VAR

    ptr: INTEGER;

BEGIN

    ptr := malloc(line.length + 2);

    ASSERT(ptr # 0);

    SYSTEM.MOVE(line.ptr, ptr, pos*WCHAR_SIZE);

    SYSTEM.PUT(ptr + pos*WCHAR_SIZE, c);

    SYSTEM.MOVE(line.ptr + pos*WCHAR_SIZE, ptr + pos*WCHAR_SIZE + WCHAR_SIZE, (line.length - pos)*WCHAR_SIZE);

    IF ~line.temp THEN

        movInt(line.length, line.length + 1)

    END;

    INC(line.length);

    SYSTEM.PUT16(ptr + line.length*WCHAR_SIZE, 0);

    free(line, ptr)

END insert;

PROCEDURE insert2* (line1: tLine; pos: INTEGER; line2: tLine);

VAR

    ptr: INTEGER;

BEGIN

    IF line2.length > 0 THEN

        ptr := malloc(line1.length + line2.length + 1);

        ASSERT(ptr # 0);

        SYSTEM.MOVE(line1.ptr, ptr, pos*WCHAR_SIZE);

        SYSTEM.MOVE(line2.ptr, ptr + pos*WCHAR_SIZE, line2.length*WCHAR_SIZE);

        SYSTEM.MOVE(line1.ptr + pos*WCHAR_SIZE, ptr + (pos + line2.length)*WCHAR_SIZE, (line1.length - pos)*WCHAR_SIZE);

        SYSTEM.PUT16(ptr + (line1.length + line2.length)*WCHAR_SIZE, 0);

        IF ~line1.temp THEN

            movInt(line1.length, line1.length + line2.length)

        END;

        IF ~line2.temp THEN

            movInt(line2.length, 0)

        END;

        INC(line1.length, line2.length);

        line2.length := 0;

        free(line1, ptr);

        free(line2, 0)

    END

END insert2;

PROCEDURE insert3* (line: tLine; pos, n: INTEGER);

VAR

    ptr: INTEGER;

BEGIN

    IF n > 0 THEN

        ptr := malloc(line.length + n + 1);

        ASSERT(ptr # 0);

        SYSTEM.MOVE(line.ptr, ptr, pos*WCHAR_SIZE);

        SYSTEM.MOVE(line.ptr + pos*WCHAR_SIZE, ptr + (pos + n)*WCHAR_SIZE, (line.length - pos)*WCHAR_SIZE);

        SYSTEM.PUT16(ptr + (line.length + n)*WCHAR_SIZE, 0);

        IF ~line.temp THEN

            movInt(line.length, line.length + n)

        END;

        INC(line.length, n);

        free(line, ptr)

    END

END insert3;

PROCEDURE delCharN* (line: tLine; pos, n: INTEGER);

VAR

    ptr: INTEGER;

BEGIN

    IF n > 0 THEN

        ptr := malloc(line.length - n + 1);

        ASSERT(ptr # 0);

        SYSTEM.MOVE(line.ptr, ptr, pos*WCHAR_SIZE);

        SYSTEM.MOVE(line.ptr + (pos + n)*WCHAR_SIZE, ptr + pos*WCHAR_SIZE, (line.length - pos - n)*WCHAR_SIZE);

        SYSTEM.PUT16(ptr + (line.length - n)*WCHAR_SIZE, 0);

        IF ~line.temp THEN

            movInt(line.length, line.length - n)

        END;

        DEC(line.length, n);

        free(line, ptr)

    END

END delCharN;

PROCEDURE fixTabs (line: tLine);

VAR

    i, n, k: INTEGER;

BEGIN

    i := 0;

    WHILE i < line.length DO

        n := tabWidth(line, i);

        IF n # 0 THEN

            k := tab - i MOD tab;

            IF n > k THEN

                delCharN(line, i + 1, n - k)

            ELSIF n < k THEN

                DEC(k, n);

                insert3(line, i + 1, k);

                WHILE k > 0 DO

                    setChar(line, i + 1, TAB1);

                    INC(i);

                    DEC(k)

                END

            END

        END;

        INC(i)

    END

END fixTabs;

PROCEDURE modify* (line: tLine);

BEGIN

    IF ~line.temp THEN

        movBool(line, line.modified, TRUE);

        movBool(line, line.saved, FALSE)

    END;

    line.modified := TRUE;

    line.saved := FALSE;

    fixTabs(line)

END modify;

PROCEDURE wrap* (line, nextLine: tLine; pos: INTEGER);

VAR

    ptr1, ptr2: INTEGER;

    n: INTEGER;

BEGIN

    ptr1 := malloc(pos + 1);

    ASSERT(ptr1 # 0);

    n := line.length - pos;

    ptr2 := malloc(n + 1);

    ASSERT(ptr2 # 0);

    SYSTEM.MOVE(line.ptr, ptr1, pos*WCHAR_SIZE);

    SYSTEM.PUT16(ptr1 + pos*WCHAR_SIZE, 0);

    SYSTEM.MOVE(line.ptr + pos*WCHAR_SIZE, ptr2, n*WCHAR_SIZE);

    SYSTEM.PUT16(ptr2 + n*WCHAR_SIZE, 0);

    IF ~line.temp THEN

        movInt(line.length, pos)

    END;

    IF ~nextLine.temp THEN

        movInt(nextLine.length, n)

    END;

    line.length := pos;

    nextLine.length := n;

    free(line, ptr1);

    free(nextLine, ptr2)

END wrap;

PROCEDURE copy* (line: tLine);

VAR

    ptr: INTEGER;

BEGIN

    ptr := malloc(line.length + 1);

    ASSERT(ptr # 0);

    SYSTEM.MOVE(line.ptr, ptr, line.length*WCHAR_SIZE);

    SYSTEM.PUT16(ptr + line.length*WCHAR_SIZE, 0);

    free(line, ptr)

END copy;

PROCEDURE chCase* (line: tLine; pos1, pos2: INTEGER; upper: BOOLEAN): BOOLEAN;

VAR

    i: INTEGER;

    modified: BOOLEAN;

    c: WCHAR;

    func: PROCEDURE (VAR c: WCHAR): BOOLEAN;

BEGIN

    modified := FALSE;

    IF upper THEN

        func := Utils.cap

    ELSE

        func := Utils.low

    END;

    i := pos2;

    WHILE i >= pos1 DO

        c := getChar(line, i);

        IF func(c) THEN

            modified := TRUE

        END;

        DEC(i)

    END;

    IF modified THEN

        copy(line);

        i := pos2;

        WHILE i >= pos1 DO

            c := getChar(line, i);

            IF func(c) THEN

                setChar(line, i, c)

            END;

            DEC(i)

        END;

        modify(line)

    END

    RETURN modified

END chCase;

PROCEDURE init* (movInt: PmovInt; movPtr: PmovPtr; movBool, movBool2: PmovBool; typedPtr: PTypedPtr; untypedPtr: PUntypedPtr);

BEGIN

    _movInt := movInt;

    _movPtr := movPtr;

    _movBool := movBool;

    _movBool2 := movBool2;

    _typedPtr := typedPtr;

    _untypedPtr := untypedPtr;

END init;

PROCEDURE setMaxLength* (VAR maxLength: INTEGER);

BEGIN

    pMaxLength := SYSTEM.ADR(maxLength)

END setMaxLength;

PROCEDURE setTabs* (_tab: INTEGER);

BEGIN

    IF _tab = 0 THEN

        _tab := 4

    END;

    tabs := _tab > 0;

    tab := ABS(_tab)

END setTabs;

BEGIN

    pMaxLength := 0

END Lines.