(*
    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 Text;

IMPORT
    List, Lines,
    G := Graph,
    U := Utils,
    RW, Search,
    E := Encodings,
    CB := Clipboard,
    K := KolibriOS,
    ChangeLog,
    Lang := Languages;


CONST

    SPACE = 20X;
    TAB = RW.TAB_SIZE;
    lenEOL = CB.lenEOL;

    SHIFT* = 0; CTRL* = 1;

    mark_width = 2;
    pad_left = mark_width + 3;
    pad_top = 1;
    inter = 2;


TYPE

    tPoint = RECORD
        X, Y: INTEGER
    END;

    pPoint = POINTER TO tPoint;

    tString* = ARRAY 1000 OF WCHAR;

    tLine = Lines.tLine;

    tGuard = POINTER TO RECORD (ChangeLog.tGuard)
        selected: BOOLEAN;
        cursor, select2, scroll: tPoint;
        CurX: INTEGER
    END;

    tText* = POINTER TO RECORD (List.tList)
        cursor, select, select2: pPoint;
        scroll: tPoint;
        CurX: INTEGER;
        modified*: BOOLEAN;

        edition*: tGuard;
        comments, numbers*, guard,
        search, cs, whole: BOOLEAN;
        curLine: tLine;
        fileName*: RW.tFileName;
        lang*: INTEGER;
        enc*: INTEGER;
        table: Search.IdxTable;
        foundList: List.tList;
        idxData: Search.tBuffer;
        foundSel: INTEGER;
        searchText: tString;
        chLog*: ChangeLog.tLog;
        maxLength*: INTEGER
    END;

    tProcedure = PROCEDURE;


VAR

    pdelete: PROCEDURE (text: tText);
    ShowCursor: PROCEDURE;

    colors*: RECORD
                text, back, seltext, selback, modified, saved, curline, numtext, numback: INTEGER;
                comment, string, num, delim, key1, key2, key3: INTEGER
             END;
    canvas: G.tCanvas;
    drawCursor*: BOOLEAN;
    padding: RECORD left, top: INTEGER END;
    size, textsize: tPoint;
    charWidth, charHeight: INTEGER;


PROCEDURE setName* (text: tText; name: RW.tFileName);
VAR
    ext: RW.tFileName;
BEGIN
    text.fileName := name;
    U.getFileName(text.fileName, ext, ".");
    U.upcase(ext);
    IF ext = "OB07" THEN
        text.lang := Lang.langOberon
    ELSIF (ext = "C") OR (ext = "H") OR (ext = "CPP") THEN
        text.lang := Lang.langC
    ELSIF (ext = "PAS") OR (ext = "PP") THEN
        text.lang := Lang.langPascal
    ELSIF ext = "ASM" THEN
        text.lang := Lang.langFasm
    ELSIF ext = "LUA" THEN
        text.lang := Lang.langLua
    ELSIF ext = "INI" THEN
        text.lang := Lang.langIni
    ELSE
        text.lang := Lang.langNone
    END
END setName;


PROCEDURE setLang* (text: tText; lang: INTEGER);
BEGIN
    text.lang := lang;
    text.comments := TRUE
END setLang;


PROCEDURE getPos* (text: tText; VAR x, y: INTEGER);
BEGIN
    x := text.cursor.X + 1;
    y := text.cursor.Y + 1
END getPos;


PROCEDURE getScroll* (text: tText; VAR x, y: INTEGER);
BEGIN
    x := text.scroll.X;
    y := text.scroll.Y
END getScroll;


PROCEDURE getTextSize* (VAR x, y: INTEGER);
BEGIN
    x := textsize.X;
    y := textsize.Y
END getTextSize;


PROCEDURE getTextRect* (VAR left, top, rigth, bottom: INTEGER);
BEGIN
    left := padding.left - 1;
    top := padding.top - 1;
    rigth := size.X - 1;
    bottom := top + size.Y - 1;
END getTextRect;


PROCEDURE toggleNumbers* (text: tText);
BEGIN
    text.numbers := ~text.numbers
END toggleNumbers;


PROCEDURE toggleCursor*;
BEGIN
    drawCursor := ~drawCursor
END toggleCursor;


PROCEDURE getChar (line: tLine; i: INTEGER): WCHAR;
VAR
    res: WCHAR;
BEGIN
    IF i >= line.length THEN
        res := 0X
    ELSE
        res := Lines.getChar(line, i)
    END
    RETURN res
END getChar;


PROCEDURE getString (src: tLine; pos, cnt: INTEGER; VAR dst: ARRAY OF WCHAR): INTEGER;
VAR
    i: INTEGER;
BEGIN
    i := 0;
    WHILE (pos < src.length) & (cnt > 0) DO
        IF i < LEN(dst) - 1 THEN
            dst[i] := getChar(src, pos);
            INC(i)
        END;
        INC(pos);
        DEC(cnt)
    END;
    dst[i] := 0X
    RETURN i
END getString;


PROCEDURE NextLine (VAR line: tLine);
BEGIN
    line := line.next(tLine)
END NextLine;


PROCEDURE PrevLine (VAR line: tLine);
BEGIN
    line := line.prev(tLine)
END PrevLine;


PROCEDURE SetColor (textColor, backColor: INTEGER);
BEGIN
    G.SetTextColor(canvas, textColor);
    G.SetBkColor(canvas, backColor)
END SetColor;


PROCEDURE ProcessComments (line: tLine; VAR depth, pos: INTEGER; minDepth, n: INTEGER; lang: INTEGER);
VAR
    cond: INTEGER;
BEGIN
    cond := 0;
    WHILE (pos <= n) & (depth > minDepth) DO
        Lang.comments(line, depth, cond, pos, n, lang);
        INC(pos)
    END;
    DEC(pos)
END ProcessComments;


PROCEDURE Comments (text: tText);
VAR
    line: tLine;
    i: INTEGER;
BEGIN
    line := text.first(tLine);
    line.cin := 0;
    line.cout := 0;
    i := 0;
    ProcessComments(line, line.cout, i, -1, line.length - 1, text.lang);
    NextLine(line);
    WHILE line # NIL DO
        line.cin := line.prev(tLine).cout;
        line.cout := line.cin;
        i := 0;
        ProcessComments(line, line.cout, i, -1, line.length - 1, text.lang);
        NextLine(line)
    END;
    text.comments := FALSE
END Comments;


PROCEDURE parse (text: tText; line: tLine; y: INTEGER; backColor: INTEGER; lang: INTEGER);
VAR
    c: WCHAR;
    i, n, k: INTEGER;
    cond, depth: INTEGER;
    color: INTEGER;
    hex: BOOLEAN;
    isDgt: PROCEDURE (c: WCHAR): BOOLEAN;


    PROCEDURE PrintLex (text: tText; line: tLine; lexStart, lexEnd: INTEGER; y: INTEGER; color, backColor: INTEGER);
    VAR
        lexLen: INTEGER;
    BEGIN
        SetColor(color, backColor);
        lexLen := MAX(MIN(line.length - lexStart, lexEnd - lexStart + 1), 0);
        G.TextOut(canvas, padding.left + (lexStart - text.scroll.X) * charWidth, y, Lines.getPChar(line, lexStart), lexLen)
    END PrintLex;


    PROCEDURE PrintComment (text: tText; line: tLine; VAR depth, i: INTEGER; y: INTEGER; backColor: INTEGER);
    VAR
        lexStart: INTEGER;
        color: INTEGER;
    BEGIN
        IF (text.lang = Lang.langLua) & ~ODD(depth) THEN
            color := colors.string
        ELSIF (text.lang = Lang.langIni) & (depth = 1) THEN
            color := colors.key2
        ELSIF (text.lang = Lang.langPascal) & (depth = 3) THEN
            color := colors.key3
        ELSE
            color := colors.comment
        END;
        lexStart := MAX(i - 2, 0);
        ProcessComments(line, depth, i, 0, line.length - 1, text.lang);
        PrintLex(text, line, lexStart, i, y, color, backColor)
    END PrintComment;


    PROCEDURE cap (c: WCHAR): WCHAR;
    BEGIN
        IF U.cap(c) THEN END
        RETURN c
    END cap;


    PROCEDURE UL (c: WCHAR): BOOLEAN;
        RETURN (cap(c) = "U") OR (cap(c) = "L")
    END UL;


    PROCEDURE FL (c: WCHAR): BOOLEAN;
        RETURN (cap(c) = "F") OR (cap(c) = "L")
    END FL;


    PROCEDURE isFASMdelim (c: WCHAR): BOOLEAN;
    VAR
        s: ARRAY 19 OF WCHAR;
        i: INTEGER;
    BEGIN
        s := "{}[]<>:,()&*/|+-\#";
        i := LEN(s) - 2;
        WHILE (i >= 0) & (c # s[i]) DO
            DEC(i)
        END
        RETURN i >= 0
    END isFASMdelim;


    PROCEDURE ident (text: tText; VAR i: INTEGER; first, y: INTEGER; line: tLine; backColor: INTEGER; cs: BOOLEAN);
    VAR
        c: WCHAR;
        lexLen: INTEGER;
        s: ARRAY 32 OF WCHAR;
        color: INTEGER;
    BEGIN
        c := getChar(line, i);
        WHILE U.isLetter(c) OR (c = "_") OR U.isDigit(c) DO
            INC(i);
            c := getChar(line, i);
        END;
        DEC(i);
        lexLen := getString(line, first, i - first + 1, s);
        IF ~cs THEN
            U.upcase16(s)
        END;
        IF Lang.isKey(s, text.lang, 1) THEN
            color := colors.key1
        ELSIF Lang.isKey(s, text.lang, 2) THEN
            color := colors.key2
        ELSIF Lang.isKey(s, text.lang, 3) THEN
            color := colors.key3
        ELSE
            color := colors.text
        END;
        IF color # colors.text THEN
            PrintLex(text, line, first, i, y, color, backColor)
        END
    END ident;


    PROCEDURE String (text: tText; line: tLine; VAR i: INTEGER; y: INTEGER; backColor: INTEGER);
    VAR
        k: INTEGER;
    BEGIN
        k := i;
        Lang.SkipString(line, i, line.length - 1);
        PrintLex(text, line, k, i, y, colors.string, backColor)
    END String;


BEGIN
    depth := line.cin;
    n := line.length - 1;
    i := 0;
    IF (depth > 0) & (n >= 0) THEN
        PrintComment(text, line, depth, i, y, backColor)
    END;
    cond := 0;
    WHILE i <= n DO
        c := getChar(line, i);

        IF lang = Lang.langFasm THEN

            IF c = ";" THEN
                PrintLex(text, line, i, n, y, colors.comment, backColor);
                i := n
            ELSIF (c = "'") OR (c = '"') THEN
                String(text, line, i, y, backColor)
            ELSIF (U.isLetter(c) OR (c = "_")) THEN
                ident(text, i, i, y, line, backColor, Lang.isCS(lang))
            ELSIF isFASMdelim(c) THEN
                PrintLex(text, line, i, i, y, colors.delim, backColor)
            ELSIF U.isDigit(c) THEN
                hex := FALSE;
                k := i;
                INC(i);
                c := getChar(line, i);
                IF (cap(c) = "X") & (getChar(line, i - 1) = "0") THEN
                    INC(i);
                    hex := TRUE
                END;

                WHILE U.isHex(cap(getChar(line, i))) DO
                    INC(i)
                END;

                IF (cap(getChar(line, i)) = "H") & ~hex THEN
                    INC(i)
                END;

                DEC(i);
                PrintLex(text, line, k, i, y, colors.num, backColor)
            END

        ELSIF lang = Lang.langC THEN

        IF depth = 0 THEN
            IF c = "/" THEN
                IF cond = 0 THEN
                    cond := 1
                ELSE
                    PrintLex(text, line, i - 1, n, y, colors.comment, backColor);
                    cond := 0;
                    i := n
                END
            ELSIF (c = "*") & (cond = 1) THEN
                depth := 1;
                INC(i);
                PrintComment(text, line, depth, i, y, backColor);
                cond := 0
            ELSIF (c = "'") OR (c = '"') THEN
                String(text, line, i, y, backColor);
                cond := 0
            ELSIF (U.isLetter(c) OR (c = "_")) THEN
                ident(text, i, i - ORD((i > 0) & (getChar(line, i - 1) = "#")), y, line, backColor, Lang.isCS(lang));
                cond := 0
            ELSIF U.isDigit(c) THEN
                k := i;
                INC(i);
                c := getChar(line, i);
                IF c = "." THEN
                    DEC(i);
                    c := getChar(line, i)
                END;
                IF (cap(c) = "X") & (getChar(line, i - 1) = "0") THEN
                    REPEAT
                        INC(i);
                        c := getChar(line, i)
                    UNTIL ~U.isHex(cap(c));
                    IF UL(c) THEN
                        INC(i)
                    END
                ELSIF UL(c) THEN
                    INC(i)
                ELSIF U.isDigit(c) THEN
                    REPEAT
                        INC(i)
                    UNTIL ~U.isDigit(getChar(line, i));
                    c := getChar(line, i);
                    IF UL(c) THEN
                        INC(i)
                    ELSIF c = "." THEN
                        INC(i);
                        WHILE U.isDigit(getChar(line, i)) DO
                            INC(i)
                        END;
                        c := getChar(line, i);
                        IF cap(c) = "E" THEN
                            INC(i);
                            c := getChar(line, i);
                            IF (c = "+") OR (c = "-") THEN
                                INC(i)
                            END;
                            IF U.isDigit(getChar(line, i)) THEN
                                WHILE U.isDigit(getChar(line, i)) DO
                                    INC(i)
                                END;
                                c := getChar(line, i);
                                IF FL(c) THEN
                                    INC(i)
                                END
                            END
                        ELSIF FL(c) THEN
                            INC(i)
                        END
                    END
                END;
                DEC(i);
                PrintLex(text, line, k, i, y, colors.num, backColor);
                cond := 0
            ELSE
                cond := 0
            END
        ELSIF depth = 1 THEN
            IF c = "*" THEN
                cond := 1
            ELSIF (c = "/") & (cond = 1) THEN
                cond := 0;
                depth := 0
            ELSE
                cond := 0
            END
        END;

        ELSIF lang = Lang.langOberon THEN

        IF (depth = 0) & (c = "/") THEN
            IF cond = 3 THEN
                PrintLex(text, line, i - 1, n, y, colors.comment, backColor);
                cond := 0;
                i := n
            ELSE
                cond := 3
            END
        ELSIF (depth = 0) & ((c = "'") OR (c = '"')) THEN
            String(text, line, i, y, backColor);
            cond := 0
        ELSIF (depth = 0) & U.isDigit(c) THEN
            color := colors.num;
            k := i;
            INC(i);
            WHILE U.isHex(getChar(line, i)) DO
                INC(i)
            END;
            IF i <= n THEN
                IF getChar(line, i) = "." THEN
                    INC(i);
                    IF getChar(line, i) = "." THEN
                        DEC(i)
                    END;
                    WHILE U.isDigit(getChar(line, i)) DO
                        INC(i)
                    END;
                    IF getChar(line, i) = "E" THEN
                        INC(i);
                        IF (getChar(line, i) = "+") OR (getChar(line, i) = "-") THEN
                            INC(i)
                        END;
                        WHILE U.isDigit(getChar(line, i)) DO
                            INC(i)
                        END
                    END
                ELSIF getChar(line, i) = "H" THEN
                    INC(i)
                ELSIF getChar(line, i) = "X" THEN
                    color := colors.string;
                    INC(i)
                END
            END;
            DEC(i);
            PrintLex(text, line, k, i, y, color, backColor);
            cond := 0
        ELSIF (depth = 0) & (U.isLetter(c) OR (c = "_")) THEN
            ident(text, i, i, y, line, backColor, Lang.isCS(lang));
            cond := 0
        ELSIF c = "(" THEN
            cond := 1
        ELSIF c = "*" THEN
            IF cond = 1 THEN
                INC(depth);
                INC(i);
                PrintComment(text, line, depth, i, y, backColor);
                cond := 0
            ELSE
                cond := 2
            END
        ELSIF c = ")" THEN
            IF cond = 2 THEN
                IF depth > 0 THEN
                    DEC(depth)
                END
            END;
            cond := 0
        ELSE
            cond := 0
        END

        ELSIF lang = Lang.langLua THEN

        IF depth = 0 THEN
            IF c = "-" THEN
                IF cond = 1 THEN
                    IF Lang.LuaLong(line, i + 1) >= 0 THEN
                        depth := Lang.LuaLong(line, i + 1)*2 + 1;
                        INC(i);
                        PrintComment(text, line, depth, i, y, backColor)
                    ELSE
                        PrintLex(text, line, i - 1, n, y, colors.comment, backColor);
                        i := n
                    END;
                    cond := 0
                ELSE
                    cond := 1
                END
            ELSIF c = "[" THEN
                cond := 0;
                k := Lang.LuaLong(line, i);
                IF k >= 0 THEN
                    depth := (k + 1)*2;
                    INC(i, 2);
                    PrintComment(text, line, depth, i, y, backColor);
                    cond := 0
                END
            ELSIF (c = "'") OR (c = '"') THEN
                String(text, line, i, y, backColor);
                cond := 0
            ELSIF U.isDigit(c) THEN
                k := i;
                IF (c = "0") & (cap(getChar(line, i + 1)) = "X") THEN
                    isDgt := U.isHex;
                    hex := TRUE;
                    INC(i, 2)
                ELSE
                    isDgt := U.isDigit;
                    hex := FALSE
                END;
                WHILE isDgt(cap(getChar(line, i))) DO
                    INC(i)
                END;
                IF getChar(line, i) = "." THEN
                    INC(i);
                    IF getChar(line, i) = "." THEN
                        DEC(i)
                    END;
                    WHILE isDgt(cap(getChar(line, i))) DO
                        INC(i)
                    END
                END;
                IF (cap(getChar(line, i)) = "E") OR hex & (cap(getChar(line, i)) = "P") THEN
                    INC(i);
                    IF (getChar(line, i) = "-") OR (getChar(line, i) = "+") THEN
                        INC(i)
                    END;
                    WHILE isDgt(cap(getChar(line, i))) DO
                        INC(i)
                    END
                END;
                DEC(i);
                PrintLex(text, line, k, i, y, colors.num, backColor);
                cond := 0
            ELSIF U.isLetter(c) OR (c = "_") THEN
                ident(text, i, i, y, line, backColor, Lang.isCS(lang));
                cond := 0
            ELSE
                cond := 0
            END

        ELSIF depth > 0 THEN
            IF (cond = 0) & (c = "]") THEN
                cond := 1
            ELSIF (cond >= 1) & (c = "=") THEN
                INC(cond)
            ELSIF (cond >= 1) & (c = "]") & (cond * 2 - depth MOD 2 = depth) THEN
                depth := 0;
                cond := 0
            ELSE
                cond := 0
            END
        END

        ELSIF lang = Lang.langPascal THEN

        IF depth = 0 THEN
            IF c = "(" THEN
                cond := 1
            ELSIF (c = "*") & (cond = 1) THEN
                depth := 2;
                INC(i);
                PrintComment(text, line, depth, i, y, backColor);
                cond := 0
            ELSIF c = "/" THEN
                IF cond = 2 THEN
                    PrintLex(text, line, i - 1, n, y, colors.comment, backColor);
                    cond := 0;
                    i := n
                ELSE
                    cond := 2
                END
            ELSIF c = "'" THEN
                String(text, line, i, y, backColor);
                cond := 0
            ELSIF c = "{" THEN
                IF getChar(line, i + 1) = "$" THEN
                    depth := 3
                ELSE
                    depth := 1
                END;
                INC(i, 2);
                PrintComment(text, line, depth, i, y, backColor);
                cond := 0
            ELSIF c = "#" THEN
                k := i;
                INC(i);
                WHILE U.isDigit(getChar(line, i)) DO
                    INC(i)
                END;
                DEC(i);
                PrintLex(text, line, k, i, y, colors.string, backColor);
                cond := 0
            ELSIF c = "$" THEN
                IF (i > 0 ) & (getChar(line, i - 1) = "#") THEN
                    color := colors.string
                ELSE
                    color := colors.num
                END;
                k := i;
                INC(i);
                WHILE U.isHex(cap(getChar(line, i))) DO
                    INC(i)
                END;
                DEC(i);
                PrintLex(text, line, k, i, y, color, backColor);
                cond := 0
            ELSIF U.isDigit(c) THEN
                k := i;
                WHILE U.isDigit(getChar(line, i)) DO
                    INC(i)
                END;
                IF getChar(line, i) = "." THEN
                    INC(i);
                    IF getChar(line, i) = "." THEN
                        DEC(i)
                    END;
                    WHILE U.isDigit(getChar(line, i)) DO
                        INC(i)
                    END;
                    IF cap(getChar(line, i)) = "E" THEN
                        INC(i);
                        IF (getChar(line, i) = "-") OR (getChar(line, i) = "+") THEN
                            INC(i)
                        END;
                        WHILE U.isDigit(getChar(line, i)) DO
                            INC(i)
                        END
                    END
                END;
                DEC(i);
                PrintLex(text, line, k, i, y, colors.num, backColor);
                cond := 0
            ELSIF (U.isLetter(c) OR (c = "_")) THEN
                ident(text, i, i, y, line, backColor, Lang.isCS(lang));
                cond := 0
            ELSE
                cond := 0
            END
        ELSIF depth IN {1, 3} THEN
            IF c = "}" THEN
                depth := 0
            END
        ELSIF depth = 2 THEN
            IF c = "*" THEN
                cond := 1
            ELSIF (c = ")") & (cond = 1) THEN
                depth := 0;
                cond := 0
            ELSE
                cond := 0
            END
        END

        ELSIF lang = Lang.langIni THEN

        IF depth = 0 THEN
            IF (c = ";") OR (c = "#") THEN
                PrintLex(text, line, i, n, y, colors.comment, backColor);
                i := n
            ELSIF c = '"' THEN
                String(text, line, i, y, backColor)
            ELSIF c = "=" THEN
                PrintLex(text, line, i, i, y, colors.delim, backColor)
            ELSIF c = "[" THEN
                depth := 1;
                INC(i, 2);
                PrintComment(text, line, depth, i, y, backColor)
            ELSIF U.isDigit(c) THEN
                k := i;
                WHILE U.isDigit(getChar(line, i)) DO
                    INC(i)
                END;
                DEC(i);
                PrintLex(text, line, k, i, y, colors.num, backColor)
            ELSIF (U.isLetter(c) OR (c = "_")) THEN
                ident(text, i, i, y, line, backColor, Lang.isCS(lang))
            END
        ELSIF depth = 1 THEN
            IF c = "]" THEN
                depth := 0
            END
        END

        END;
        INC(i)
    END
END parse;


PROCEDURE leadingSpaces (line: tLine): INTEGER;
VAR
    i: INTEGER;
BEGIN
    i := 0;
    WHILE getChar(line, i) = SPACE DO
        INC(i)
    END
    RETURN i
END leadingSpaces;


PROCEDURE plain (text: tText; eot: BOOLEAN): CB.tBuffer;
VAR
    buf: CB.tBuffer;
    size: INTEGER;
    line: tLine;
    EOT: ARRAY 2 OF WCHAR;
BEGIN
    size := 0;
    line := text.first(tLine);
    WHILE line # NIL DO
        line.pos := size;
        INC(size, line.length);
        NextLine(line);
        IF line # NIL THEN
            INC(size, CB.lenEOL)
        END
    END;
    IF eot THEN
        INC(size, 2)
    END;
    buf := CB.create(size);
    line := text.first(tLine);
    WHILE line # NIL DO
        CB.append(buf, line, 0, line.length - 1);
        NextLine(line);
        IF line # NIL THEN
            CB.eol(buf)
        END
    END;
    IF eot THEN
        EOT[0] := 0X;
        EOT[1] := 0X;
        CB.appends(buf, EOT, 0, 1)
    END
    RETURN buf
END plain;


PROCEDURE search* (text: tText; s: ARRAY OF WCHAR; cs, whole: BOOLEAN): BOOLEAN;
VAR
    pos: List.tItem;
    res: BOOLEAN;
    plainText: Search.tBuffer;
BEGIN
    plainText := NIL;
    WHILE text.foundList.count # 0 DO
        pos := List.pop(text.foundList);
        DISPOSE(pos)
    END;
    text.whole := whole;
    text.cs := cs;
    text.searchText := s;
    IF ~cs THEN
        U.upcase16(text.searchText)
    END;
    IF text.searchText # "" THEN
        plainText := plain(text, TRUE);
        text.idxData := Search.index(plainText, text.table, cs);
        Search.find(plainText, text.table, text.searchText, whole, text.foundList);
        res := text.foundList.count > 0
    ELSE
        res := TRUE
    END;
    CB.destroy(plainText);
    CB.destroy(text.idxData);
    text.search := FALSE;
    text.foundSel := 0
    RETURN res
END search;


PROCEDURE modify (text: tText);
BEGIN
    text.modified := TRUE;
    text.comments := TRUE;
    text.search := TRUE;
    text.guard := TRUE
END modify;


PROCEDURE DelLine (text: tText; line: tLine);
BEGIN
    List._delete(text, line);
    Lines.destroy(line);
    modify(text)
END DelLine;


PROCEDURE setSelect (text: tText);
BEGIN
    IF text.select = text.cursor THEN
        text.select2^ := text.cursor^;
        text.select := text.select2
    END
END setSelect;


PROCEDURE resetSelect* (text: tText);
BEGIN
    text.select := text.cursor
END resetSelect;


PROCEDURE getLine (text: tText; n: INTEGER): tLine;
VAR
    item: List.tItem;
BEGIN
    item := List.getItem(text, n);
    RETURN item(tLine)
END getLine;


PROCEDURE SetPos* (text: tText; x, y: INTEGER);
VAR
    deltaY: INTEGER;
    cursor: pPoint;
   (* trimLength: INTEGER; *)
BEGIN
    cursor := text.cursor;
    y := MIN(MAX(y, 0), text.count - 1);
    deltaY := y - cursor.Y;
    IF deltaY # 0 THEN
        cursor.Y := y;
(*        trimLength := Lines.trimLength(text.curLine);
        IF text.curLine.length # trimLength THEN
            Lines.setChar(text.curLine, trimLength, 0X);
            text.curLine.length := trimLength
        END;*)
        IF deltaY = 1 THEN
            NextLine(text.curLine)
        ELSIF deltaY = -1 THEN
            PrevLine(text.curLine)
        ELSE
            text.curLine := getLine(text, y)
        END
    END;
    cursor.X := MIN(MAX(x, 0), text.curLine.length);
    IF text.scroll.Y > cursor.Y THEN
        text.scroll.Y := cursor.Y
    ELSIF text.scroll.Y + textsize.Y <= cursor.Y THEN
        text.scroll.Y := cursor.Y - textsize.Y + 1
    END;
    IF text.scroll.X > cursor.X THEN
        text.scroll.X := cursor.X
    ELSIF text.scroll.X + textsize.X <= cursor.X THEN
        text.scroll.X := cursor.X - textsize.X + 1
    END;
    IF (text.select.Y = cursor.Y) & (text.select.X > text.curLine.length) THEN
        text.select.X := text.curLine.length
    END;
    setSelect(text);
    text.foundSel := 0;
    ShowCursor;
    drawCursor := TRUE;
    text.CurX := -1
END SetPos;


PROCEDURE getSelect (text: tText; VAR selBeg, selEnd: tPoint);
BEGIN
    selBeg := text.cursor^;
    selEnd := text.select^;
    IF (selBeg.Y > selEnd.Y) OR (selBeg.Y = selEnd.Y) & (selBeg.X > selEnd.X) THEN
        selBeg := text.select^;
        selEnd := text.cursor^
    END
END getSelect;


PROCEDURE selected* (text: tText): BOOLEAN;
    RETURN (text.cursor.X # text.select.X) OR (text.cursor.Y # text.select.Y)
END selected;


PROCEDURE delSelect (text: tText);
VAR
    selBeg, selEnd: tPoint;
    line, last, cur: tLine;
BEGIN
    getSelect(text, selBeg, selEnd);
    IF (selBeg.Y = selEnd.Y) & (selBeg.X < selEnd.X) THEN
        line := text.curLine;
        Lines.delCharN(line, selBeg.X, selEnd.X - selBeg.X);
        Lines.modify(line);
        text.cursor^ := selBeg;
        resetSelect(text);
        SetPos(text, text.cursor.X, text.cursor.Y);
        modify(text)
    ELSIF selBeg.Y < selEnd.Y THEN
        SetPos(text, selBeg.X, selBeg.Y);
        line := text.curLine;
        Lines.delCharN(line, selBeg.X, line.length - selBeg.X);
        last := getLine(text, selEnd.Y);
        Lines.delCharN(last, 0, selEnd.X);
        cur := line.next(tLine);
        WHILE cur # last DO
            DelLine(text, cur);
            cur := line.next(tLine)
        END;
        resetSelect(text);
        SetPos(text, text.cursor.X, text.cursor.Y);
        pdelete(text);
        modify(text)
    END;
    resetSelect(text)
END delSelect;


PROCEDURE delete (text: tText);
VAR
    i: INTEGER;
    nextLine, curLine: tLine;
BEGIN
    IF selected(text) THEN
        delSelect(text)
    ELSE
        i := text.cursor.X;
        curLine := text.curLine;
        IF i < curLine.length THEN
            Lines.delChar(curLine, i);
            Lines.modify(curLine);
            modify(text)
        ELSE
            nextLine := curLine.next(tLine);
            IF nextLine # NIL THEN
                Lines.modify(curLine);
                modify(text);
                Lines.insert2(curLine, i, nextLine);
                DelLine(text, nextLine)
            END
        END
    END;
    setSelect(text)
END delete;


PROCEDURE BkSpace (text: tText);
VAR
    i, n, k: INTEGER;
    curLine, line: tLine;
BEGIN
    IF selected(text) THEN
        delSelect(text)
    ELSE
        resetSelect(text);
        i := text.cursor.X;
        curLine := text.curLine;
        IF i > 0 THEN
            modify(text);
            n := leadingSpaces(curLine);
            IF n < i THEN
                Lines.delChar(curLine, i - 1);
                Lines.modify(curLine);
                k := 1
            ELSE
                n := i;
                line := curLine.prev(tLine);
                k := n;
                WHILE (line # NIL) & (k >= n) DO
                    IF Lines.trimLength(line) # 0 THEN
                        k := leadingSpaces(line)
                    END;
                    PrevLine(line)
                END;
                IF k >= n THEN
                    k := 0
                END;
                DEC(n, k);
                k := n;
                Lines.modify(curLine);
                Lines.delCharN(curLine, 0, n)
            END;
            SetPos(text, text.cursor.X - k, text.cursor.Y)
        ELSE
            PrevLine(curLine);
            IF curLine # NIL THEN
                SetPos(text, curLine.length, text.cursor.Y - 1);
                delete(text)
            END
        END
    END;
    setSelect(text)
END BkSpace;


PROCEDURE enter (text: tText);
VAR
    n: INTEGER;
    curLine, newLine, line: tLine;
BEGIN
    delSelect(text);
    newLine := Lines.create(FALSE);
    Lines.modify(newLine);
    modify(text);
    curLine := text.curLine;
    IF text.cursor.X < curLine.length THEN
        Lines.modify(curLine);
        Lines.wrap(curLine, newLine, text.cursor.X)
    END;
    List._insert(text, curLine, newLine);
    SetPos(text, 0, text.cursor.Y + 1);
    line := text.curLine.prev(tLine);
    n := -1;
    WHILE (line # NIL) & (n = -1) DO
        IF (*line.length*)Lines.trimLength(line) # 0 THEN
            n := leadingSpaces(line)
        END;
        PrevLine(line)
    END;
    IF n = -1 THEN
        n := 0
    END;
    Lines.insert3(text.curLine, 0, n);
    SetPos(text, n, text.cursor.Y);
    resetSelect(text);
    WHILE n > 0 DO
        Lines.setChar(text.curLine, n - 1, SPACE);
        DEC(n)
    END
END enter;


PROCEDURE input* (text: tText; code: INTEGER);
VAR
    curLine: tLine;

    PROCEDURE tab (text: tText);
    VAR
        i, x: INTEGER;
        curLine: tLine;
    BEGIN
        delSelect(text);
        curLine := text.curLine;
        x := text.cursor.X;
        Lines.modify(curLine);
        modify(text);
        i := TAB - x MOD TAB;
        Lines.insert3(curLine, x, i);
        SetPos(text, x + i, text.cursor.Y);
        WHILE i > 0 DO
            Lines.setChar(curLine, x + i - 1, SPACE);
            DEC(i)
        END
    END tab;

BEGIN
    IF (code >= ORD(SPACE)) & (code # 127) THEN
        delSelect(text);
        curLine := text.curLine;
        Lines.insert(curLine, text.cursor.X, WCHR(code));
        Lines.modify(curLine);
        modify(text);
        SetPos(text, text.cursor.X + 1, text.cursor.Y)
    ELSIF code = 8 THEN
        BkSpace(text)
    ELSIF code = 9 THEN
        tab(text)
    ELSIF code = 13 THEN
        enter(text)
    END
END input;


PROCEDURE scroll* (text: tText; h, v: INTEGER);
BEGIN
    INC(text.scroll.X, h);
    INC(text.scroll.Y, v);
    text.scroll.X := MIN(MAX(text.scroll.X, 0), text.maxLength);
    text.scroll.Y := MIN(MAX(text.scroll.Y, 0), text.count - 1)
END scroll;


PROCEDURE save* (text: tText; name: RW.tFileName; enc, nl: INTEGER): BOOLEAN;
VAR
    line: tLine;
    file: RW.tOutput;
    res: BOOLEAN;
    Len: INTEGER;
(*    item: List.tItem;*)
BEGIN
    res := TRUE;
    file := RW.create(name, enc, nl);
    IF file # NIL THEN
(*        IF ChangeLog.Log.last IS ChangeLog.tGuard THEN
            item := List.pop(ChangeLog.Log);
            DISPOSE(item)
        END;*)
        line := text.first(tLine);
        WHILE (line # NIL) & res DO
            Len := Lines.trimLength(line);
            IF RW.putString(file, line, Len) # Len THEN
                res := FALSE
            END;
            IF line.modified THEN
                Lines.save(line)
            END;
            NextLine(line);
            IF line # NIL THEN
                IF ~RW.newLine(file) THEN
                    res := FALSE
                END
            END
        END;
        IF ~RW.close(file) THEN
            res := FALSE
        END;
        IF res THEN
            text.modified := FALSE
        END
    ELSE
        res := FALSE
    END;
    text.guard := TRUE
    RETURN res
END save;


PROCEDURE redoGuard (text: tText; guard: tGuard);
BEGIN
    text.edition := guard;
    text.cursor^ := guard.cursor;
    text.select2^ := guard.select2;
    text.scroll := guard.scroll;
    text.CurX := guard.CurX;
    IF guard.selected THEN
        text.select := text.select2
    ELSE
        text.select := text.cursor
    END;
    text.curLine := getLine(text, text.cursor.Y);
    text.comments := TRUE;
    text.search := TRUE
END redoGuard;


PROCEDURE undo* (text: tText);
VAR
    item: List.tItem;
    guard: tGuard;
BEGIN
    guard := text.edition;
    item := guard.prev;
    WHILE (item # NIL) & ~(item IS tGuard) DO
        item := item.prev
    END;

    IF item # NIL THEN
        guard := item(tGuard);
        text.edition := guard;
        text.modified := TRUE
    END;

    item := ChangeLog.CL.Log.first;
    WHILE item # guard DO
        ChangeLog.redo(item);
        item := item.next
    END;
    redoGuard(text, guard);
    ChangeLog.setGuard(guard)
END undo;


PROCEDURE redo* (text: tText);
VAR
    item: List.tItem;
    guard: tGuard;
BEGIN
    guard := text.edition;
    item := guard.next;
    WHILE (item # NIL) & ~(item IS tGuard) DO
        ChangeLog.redo(item);
        item := item.next
    END;
    IF item # NIL THEN
        guard := item(tGuard);
        redoGuard(text, guard)
    END;
    ChangeLog.setGuard(guard)
END redo;


PROCEDURE copy (text: tText);
VAR
    selBeg, selEnd: tPoint;
    first, line: tLine;
    cnt, n: INTEGER;
    buffer: CB.tBuffer;


    PROCEDURE append (buffer: CB.tBuffer; line: tLine; first, last: INTEGER);
    BEGIN
        IF first <= last THEN
            CB.append(buffer, line, first, last)
        ELSE
            IF U.OS = "KOS" THEN
                CB.appends(buffer, SPACE, 0, 0)
            END
        END
    END append;


BEGIN
    getSelect(text, selBeg, selEnd);

    first := getLine(text, selBeg.Y);
    line := first;

    n := selEnd.Y - selBeg.Y;
    cnt := 0;
    WHILE n >= 0 DO
        INC(cnt, line.length + lenEOL);
        NextLine(line);
        DEC(n)
    END;

    buffer := CB.create(cnt);

    n := selEnd.Y - selBeg.Y;
    line := first;
    IF n = 0 THEN
        CB.append(buffer, line, selBeg.X, selEnd.X - 1)
    ELSE
        append(buffer, line, selBeg.X, line.length - 1);
        REPEAT
            DEC(n);
            CB.eol(buffer);
            NextLine(line);
            IF n > 0 THEN
                append(buffer, line, 0, line.length - 1)
            END
        UNTIL n = 0;
        append(buffer, line, 0, selEnd.X - 1)
    END;
    CB.eot(buffer);
    CB.put(buffer);
    CB.destroy(buffer)
END copy;


PROCEDURE paste (text: tText);
VAR
    line, newLine, curLine: tLine;
    L: INTEGER;
    cliptext: RW.tInput;
    eol: BOOLEAN;
    cursor: pPoint;
BEGIN
    line := Lines.create(TRUE);
    cliptext := RW.clipboard();
    delSelect(text);
    cursor := text.cursor;
    WHILE (cliptext # NIL) & (RW.getString(cliptext, line, eol) >= 0) DO
        L := line.length;
        IF L > 0 THEN
            Lines.insert2(text.curLine, cursor.X, line);
            Lines.modify(text.curLine);
            modify(text);
            SetPos(text, cursor.X + L, cursor.Y);
            resetSelect(text)
        END;
        IF eol THEN
            newLine := Lines.create(FALSE);
            Lines.modify(newLine);
            modify(text);
            curLine := text.curLine;
            IF cursor.X < curLine.length THEN
                Lines.modify(curLine);
                Lines.wrap(curLine, newLine, cursor.X)
            END;
            List._insert(text, curLine, newLine);
            SetPos(text, 0, cursor.Y + 1);
            resetSelect(text)
        END;
        Lines.destroy(line);
        line := Lines.create(TRUE)
    END;
    Lines.destroy(line);
    RW.destroy(cliptext)
END paste;


PROCEDURE searchScroll (text: tText; n: INTEGER);
BEGIN
    IF n - text.scroll.Y > textsize.Y - 1 THEN
        text.scroll.Y := MAX(n - 2 * textsize.Y DIV 3, 0)
    ELSIF n < text.scroll.Y THEN
        text.scroll.Y := MAX(n - textsize.Y DIV 3, 0)
    END
END searchScroll;


PROCEDURE goto* (text: tText; n: INTEGER): BOOLEAN;
VAR
    res: BOOLEAN;
BEGIN
    DEC(n);
    IF (0 <= n) & (n < text.count) THEN
        resetSelect(text);
        searchScroll(text, n);
        SetPos(text, 0, n);
        res := TRUE
    ELSE
        res := FALSE
    END
    RETURN res
END goto;


PROCEDURE changeCase (text: tText; upper: BOOLEAN);
VAR
    i: INTEGER;
    line: tLine;
BEGIN
    line := text.curLine;
    i := text.cursor.X - 1;

    WHILE (i >= 0) & U.isLetter(getChar(line, i)) DO
        DEC(i)
    END;

    IF Lines.chCase(line, i + 1, text.cursor.X - 1, upper) THEN
        modify(text)
    END
END changeCase;


PROCEDURE chCase* (text: tText; upper: BOOLEAN);
VAR
    selBeg, selEnd: tPoint;
    first, line: Lines.tLine;
    cnt: INTEGER;
    modified: BOOLEAN;
BEGIN
    modified := FALSE;
    IF selected(text) THEN
        getSelect(text, selBeg, selEnd);
        first := getLine(text, selBeg.Y);
        line := first;
        cnt := selEnd.Y - selBeg.Y;
        IF cnt = 0 THEN
            IF Lines.chCase(line, selBeg.X, selEnd.X - 1, upper) THEN
                modified := TRUE
            END
        ELSE
            IF Lines.chCase(line, selBeg.X, line.length - 1, upper) THEN
                modified := TRUE
            END;
            WHILE cnt > 1 DO
                NextLine(line);
                IF Lines.chCase(line, 0, line.length - 1, upper) THEN
                    modified := TRUE
                END;
                DEC(cnt)
            END;
            NextLine(line);
            IF Lines.chCase(line, 0, selEnd.X - 1, upper) THEN
                modified := TRUE
            END
        END
    END;
    IF modified THEN
        modify(text)
    END
END chCase;


PROCEDURE UpDown (text: tText; step: INTEGER);
VAR
    temp: INTEGER;
BEGIN
    IF text.CurX = -1 THEN
        text.CurX := text.cursor.X
    END;
    temp := text.CurX;
    SetPos(text, temp, text.cursor.Y + step);
    text.CurX := temp
END UpDown;


PROCEDURE delLine* (text: tText);
BEGIN
    resetSelect(text);
    IF text.curLine.length > 0 THEN
        Lines.delCharN(text.curLine, 0, text.curLine.length)
    END;
    SetPos(text, 0, text.cursor.Y);
    IF text.cursor.Y = text.count - 1 THEN
        BkSpace(text)
    ELSE
        delete(text)
    END
END delLine;


PROCEDURE dupLine (text: tText);
VAR
    newLine, curLine: tLine;
BEGIN
    curLine := text.curLine;
    newLine := Lines.create(FALSE);
    Lines.modify(newLine);
    modify(text);
    Lines.insert3(newLine, 0, curLine.length);
    List._insert(text, curLine, newLine);
    Lines.move(curLine, newLine)
END dupLine;


PROCEDURE exchange (text: tText; first, second: tLine);
BEGIN
    List._exchange(text, first, second);
    Lines.modify(text.curLine);
    modify(text);
    UpDown(text, 0)
END exchange;


PROCEDURE upLine (text: tText);
BEGIN
    IF text.cursor.Y > 0 THEN
        DEC(text.cursor.Y);
        exchange(text, text.curLine.prev(tLine), text.curLine)
    END
END upLine;


PROCEDURE downLine (text: tText);
BEGIN
    IF text.cursor.Y < text.count - 1 THEN
        INC(text.cursor.Y);
        exchange(text, text.curLine, text.curLine.next(tLine))
    END
END downLine;


PROCEDURE isWordChar (c: WCHAR): BOOLEAN;
    RETURN U.isLetter(c) OR U.isDigit(c) OR (c = "_")
END isWordChar;


PROCEDURE wordSel* (text: tText);
VAR
    n, i, x1, x2: INTEGER;
    selBeg, selEnd: tPoint;
    str: tString;
    curLine: tLine;
BEGIN
    curLine := text.curLine;
    IF selected(text) & (text.cursor.Y = text.select.Y) THEN
        getSelect(text, selBeg, selEnd);
        x1 := selBeg.X;
        x2 := selEnd.X;
        n := getString(curLine, x1, x2 - x1, str);
    ELSE
        str := ""
    END;
    IF str # "" THEN
        i := 0;
        WHILE (i < n) & isWordChar(str[i]) DO
            INC(i)
        END;
        IF (i # n) OR
            ((x1 > 0) & isWordChar(getChar(curLine, x1 - 1))) OR
            ((x2 < curLine.length) & isWordChar(getChar(curLine, x2))) THEN
            str := ""
        END
    END;
    IF search(text, str, Lang.isCS(text.lang), TRUE) THEN END
END wordSel;


PROCEDURE key* (text: tText; code: INTEGER; shift: SET);
BEGIN
    IF SHIFT IN shift THEN
        setSelect(text)
    ELSE
        IF (33 <= code) & (code <= 40) THEN
            resetSelect(text)
        END
    END;

    CASE code OF
    |33:
        IF CTRL IN shift THEN
            UpDown(text, text.scroll.Y - text.cursor.Y)
        ELSE
            text.scroll.Y := MAX(text.scroll.Y - textsize.Y, 0);
            UpDown(text, -textsize.Y)
        END
    |34:
        IF CTRL IN shift THEN
            UpDown(text, MIN(text.scroll.Y + textsize.Y - 1, text.count - 1) - text.cursor.Y)
        ELSE
            text.scroll.Y := MIN(text.scroll.Y + textsize.Y, text.count - 1);
            UpDown(text, textsize.Y)
        END
    |35:
        IF CTRL IN shift THEN
            SetPos(text, text.last(tLine).length, text.count - 1)
        ELSE
            SetPos(text, text.curLine.length, text.cursor.Y)
        END
    |36:
        IF CTRL IN shift THEN
            SetPos(text, 0, 0)
        ELSE
            SetPos(text, 0, text.cursor.Y)
        END
    |37:
        IF (text.cursor.X = 0) & (text.curLine.prev # NIL) THEN
            SetPos(text, text.curLine.prev(tLine).length, text.cursor.Y - 1)
        ELSE
            SetPos(text, text.cursor.X - 1, text.cursor.Y)
        END
    |38:
        IF CTRL IN shift THEN
            upLine(text)
        ELSE
            UpDown(text, -1)
        END
    |39:
        IF (text.cursor.X = text.curLine.length) & (text.curLine.next # NIL) THEN
            SetPos(text, 0, text.cursor.Y + 1)
        ELSE
            SetPos(text, text.cursor.X + 1, text.cursor.Y)
        END
    |40:
        IF CTRL IN shift THEN
            downLine(text)
        ELSE
            UpDown(text, 1)
        END
    |46:
        IF CTRL IN shift THEN
            delLine(text)
        ELSE
            delete(text); ShowCursor; drawCursor := TRUE
        END
    |ORD("C"):
        IF CTRL IN shift THEN
            IF selected(text) THEN
                copy(text)
            END
        END
    |ORD("X"):
        IF CTRL IN shift THEN
            IF selected(text) THEN
                copy(text);
                delSelect(text)
            END
        END
    |ORD("V"):
        IF CTRL IN shift THEN
            IF CB.available() THEN
                paste(text)
            END
        END
    |ORD("A"):
        IF CTRL IN shift THEN
            text.select2.X := 0;
            text.select2.Y := 0;
            text.select := text.select2;
            SetPos(text, text.last(tLine).length, text.count - 1)
        END
    |ORD("L"), ORD("U"):
        IF CTRL IN shift THEN
            changeCase(text, code = ORD("U"))
        END
    |ORD("D"):
        IF CTRL IN shift THEN
            dupLine(text)
        END
    ELSE
    END
END key;


PROCEDURE mouse* (text: tText; x, y: INTEGER);
VAR
    cursorX: INTEGER;
BEGIN
    DEC(x, padding.left);
    DEC(y, padding.top);
    cursorX := (x*2) DIV charWidth;
    SetPos(text, cursorX DIV 2 + cursorX MOD 2 + text.scroll.X, y DIV charHeight + text.scroll.Y)
END mouse;


PROCEDURE selectWord* (text: tText);
VAR
    cursorX, x1, x2: INTEGER;
    line: tLine;
BEGIN
    resetSelect(text);
    cursorX := text.cursor.X;
    line := text.curLine;
    x1 := cursorX - 1;
    IF (cursorX < line.length) & isWordChar(getChar(line,cursorX)) THEN
        x2 := cursorX;
        WHILE (x2 < line.length) & isWordChar(getChar(line, x2)) DO
            INC(x2)
        END
    ELSE
        WHILE (x1 >= 0) & ~isWordChar(getChar(line, x1)) DO
            DEC(x1)
        END;
        x2 := x1 + 1
    END;
    WHILE (x1 >= 0) & isWordChar(getChar(line, x1)) DO
        DEC(x1)
    END;
    INC(x1);
    IF x1 < x2 THEN
        SetPos(text, x1, text.cursor.Y);
        setSelect(text);
        SetPos(text, x2, text.cursor.Y)
    END
END selectWord;


PROCEDURE cursor (text: tText);
VAR
    x, y, h: INTEGER;
    cursor: pPoint;
BEGIN
    cursor := text.cursor;
    IF ~((text.scroll.Y > cursor.Y) OR (text.scroll.Y + textsize.Y <= cursor.Y) OR
       (text.scroll.X > cursor.X) OR (text.scroll.X + textsize.X <= cursor.X)) THEN
        x := (cursor.X - text.scroll.X)*charWidth + padding.left;
        y := (cursor.Y - text.scroll.Y)*charHeight + 1 + padding.top;
        h := charHeight - 2;
        G.notVLine(canvas, x, y + inter DIV 2, y + h - inter DIV 2);
        G.notVLine(canvas, x - 1, y + inter DIV 2, y + h - inter DIV 2)
    END
END cursor;


PROCEDURE drawSelect (text: tText; line: tLine; selBeg, selEnd, y: INTEGER);
VAR
    Len, pos, x, firstCharIdx: INTEGER;
BEGIN
    firstCharIdx := MAX(text.scroll.X, selBeg);
    Len := MAX(MIN(line.length - firstCharIdx, selEnd - firstCharIdx), 0);
    Len := MIN(Len, textsize.X - pos + 1);
    SetColor(colors.seltext, colors.selback);
    pos := MAX((selBeg - text.scroll.X), 0);
    x := pos*charWidth + padding.left;
    G.SetColor(canvas, colors.selback);
    G.FillRect(canvas, x - 2, y - inter DIV 2, x + 1 + Len*charWidth, y - inter DIV 2 + charHeight);
    G.TextOut(canvas, pos*charWidth + padding.left, y, Lines.getPChar(line, firstCharIdx), Len)
END drawSelect;


PROCEDURE mark (line: tLine; y: INTEGER);
VAR
    color, i: INTEGER;
BEGIN
    IF line.modified THEN
        color := colors.modified
    ELSIF line.saved THEN
        color := colors.saved
    ELSE
        color := colors.back
    END;
    G.SetColor(canvas, color);

    FOR i := 3 TO mark_width + 2 DO
        G.VLine(canvas, padding.left - i, y, y + charHeight)
    END
END mark;


PROCEDURE setPadding (left, top: INTEGER);
BEGIN
    padding.left := left;
    padding.top := top;
    textsize.X := (size.X - padding.left) DIV charWidth;
    textsize.Y := (size.Y - padding.top) DIV charHeight;
END setPadding;


PROCEDURE draw* (text: tText);
VAR
    y, n, Len, cnt, i, x: INTEGER;
    line, firstLine, lastLine: tLine;
    selBeg, selEnd: tPoint;
    s: ARRAY 12 OF WCHAR;
    backColor, numWidth, xNum, wNum: INTEGER;
    p: Search.tPos;
    guard: tGuard;
BEGIN
    IF text.search & search(text, text.searchText, text.cs, text.whole) THEN END;
    IF (text.lang # Lang.langNone) & text.comments THEN
        Comments(text)
    END;
    IF text.guard THEN
        NEW(guard);
        List.append(ChangeLog.CL.Log, guard);
        text.edition := guard;
        text.guard := FALSE;
    ELSE
        guard := text.edition
    END;

    guard.cursor := text.cursor^;
    guard.select2 := text.select2^;
    guard.scroll := text.scroll;
    guard.CurX := text.CurX;
    guard.selected := text.select = text.select2;

    G.SetColor(canvas, colors.back);
    G.clear(canvas);
    IF text.numbers THEN
        numWidth := U.lg10(text.count) + 2;
        wNum := charWidth;
        xNum := numWidth*wNum - wNum DIV 2;
        setPadding(numWidth*wNum + pad_left, padding.top);
    ELSE
        setPadding(pad_left, padding.top)
    END;
    getSelect(text, selBeg, selEnd);
    y := padding.top + inter DIV 2;
    n := text.scroll.Y;
    line := getLine(text, n);
    firstLine := line;
    cnt := 0;
    WHILE (line # NIL) & (cnt <= textsize.Y) DO
        backColor := colors.back;
        IF (line = text.curLine) & ~selected(text) THEN
            G.SetColor(canvas, colors.curline);
            G.FillRect(canvas, padding.left - 2, y - inter DIV 2, size.X - 1, y - inter DIV 2 + charHeight);
            backColor := colors.curline
        END;
        SetColor(colors.text, backColor);
        Len := MAX(line.length - text.scroll.X, 0);
        G.TextOut(canvas, padding.left, y, Lines.getPChar(line, text.scroll.X), MIN(Len, textsize.X + 1));
        IF text.lang # Lang.langNone THEN
            parse(text, line, y, backColor, text.lang)
        END;
        mark(line, y - inter DIV 2);
        IF (selBeg.Y < n) & (n < selEnd.Y) THEN
            drawSelect(text, line, 0, line.length, y)
        ELSIF (selBeg.Y = n) & (selEnd.Y = n) & (selBeg.X # selEnd.X) THEN
            drawSelect(text, line, selBeg.X, selEnd.X, y)
        ELSIF (selBeg.Y = n) & (selEnd.Y # n) THEN
            drawSelect(text, line, selBeg.X, line.length, y)
        ELSIF (selBeg.Y # n) & (selEnd.Y = n) THEN
            drawSelect(text, line, 0, selEnd.X, y)
        END;
        NextLine(line);
        INC(y, charHeight);
        INC(n);
        INC(cnt)
    END;
    IF text.numbers THEN
        G.SetColor(canvas, colors.numback);
        G.FillRect(canvas, 0, 0, padding.left - pad_left (*+ 1*), size.Y - 1);
        SetColor(colors.numtext, colors.numback);
        y := padding.top + inter DIV 2;
        n := MIN(text.scroll.Y + textsize.Y + 1, text.count);
        FOR i := text.scroll.Y + 1 TO n DO
            IF (i MOD 10 = 0) OR (i - 1 = text.cursor.Y) THEN
                U.int2str(i, s);
                G.TextOut2(canvas, (numWidth - U.lg10(i) - 1)*wNum - wNum DIV 2, y, s, LENGTH(s));
            ELSIF i MOD 5 = 0 THEN
                G.SetColor(canvas, colors.numtext);
                G.HLine(canvas, y - inter DIV 2 + charHeight DIV 2, xNum - wNum, xNum)
            ELSE
                G.SetColor(canvas, colors.numtext);
                G.HLine(canvas, y - inter DIV 2 + charHeight DIV 2, xNum - wNum DIV 2, xNum)
            END;
            INC(y, charHeight)
        END
    END;

    IF text.searchText # "" THEN
        cnt := 0;
        line := firstLine;
        lastLine := line;
        WHILE (line # NIL) & (cnt <= textsize.Y) DO
            lastLine := line;
            NextLine(line);
            INC(cnt)
        END;
        p := text.foundList.first(Search.tPos);
        WHILE p # NIL DO
            y := padding.top + inter DIV 2;
            IF (firstLine.pos <= p.pos) & (p.pos <= lastLine.pos + lastLine.length) THEN
                line := firstLine;
                WHILE (line.pos <= p.pos) & (line # lastLine) DO
                    NextLine(line);
                    INC(y, charHeight)
                END;
                IF (line # lastLine) & (line # firstLine) OR (line = lastLine) & (line.pos > p.pos) THEN
                    PrevLine(line);
                    DEC(y, charHeight)
                END;
                x := (p.pos - line.pos - text.scroll.X)*charWidth + padding.left;
                n := LENGTH(text.searchText)*charWidth;
                WHILE n > 0 DO
                    IF x >= padding.left THEN
                        G.notVLine(canvas, x, y, y + charHeight - inter)
                    END;
                    INC(x);
                    DEC(n)
                END;
            END;
            p := p.next(Search.tPos)
        END
    END;

    IF text.foundSel > 0 THEN
        x := (text.cursor.X - text.scroll.X)*charWidth + padding.left;
        y := (text.cursor.Y - text.scroll.Y)*charHeight + padding.top + inter DIV 2;
        n := text.foundSel*charWidth;
        WHILE n > 0 DO
            IF x >= padding.left THEN
                G.xorVLine(canvas, x, y, y + charHeight - inter)
            END;
            INC(x);
            DEC(n)
        END
    END;

    IF drawCursor THEN
        cursor(text)
    END;
    G.SetColor(canvas, K.borderColor);
    G.Rect(canvas, 0, 0, size.X - 1, size.Y - 1);
END draw;


PROCEDURE switch* (text: tText);
BEGIN
    ChangeLog.set(text.chLog);
    Lines.setMaxLength(text.maxLength)
END switch;


PROCEDURE create (fileName: RW.tFileName): tText;
VAR
    text: tText;
BEGIN
    NEW(text);
    text.maxLength := 64;
    text.chLog := ChangeLog.create(text.maxLength);
    NEW(text.cursor);
    NEW(text.select2);
    text.cursor.X := 0;
    text.cursor.Y := 0;
    resetSelect(text);
    text.scroll.X := 0;
    text.scroll.Y := 0;
    setPadding(padding.left, padding.top);
    text.curLine := NIL;
    text.modified := FALSE;
    text.comments := TRUE;
    text.search := TRUE;
    text.cs := FALSE;
    text.whole := FALSE;
    text.numbers := TRUE;
    text.guard := TRUE;
    text.idxData := NIL;
    text.edition := NIL;
    text.foundList := List.create(NIL);
    text.searchText := "";
    text.foundSel := 0;
    text.CurX := -1;
    setName(text, fileName);
    ASSERT(text = List.create(text))
    RETURN text
END create;


PROCEDURE setColors* (text, back, seltext, selback, modified, saved, curline, numtext, numback,
                        comment, string, num, delim, key1, key2, key3: INTEGER);
BEGIN
    colors.text := text;
    colors.back := back;
    colors.seltext := seltext;
    colors.selback := selback;
    colors.modified := modified;
    colors.saved := saved;
    colors.curline := curline;
    colors.numtext := numtext;
    colors.numback := numback;
    colors.comment := comment;
    colors.string  := string;
    colors.num := num;
    colors.delim := delim;
    colors.key1 := key1;
    colors.key2 := key2;
    colors.key3 := key3;
END setColors;


PROCEDURE setCanvas* (Canvas: G.tCanvas);
BEGIN
    canvas := Canvas;
    charWidth := canvas.font.width;
    charHeight := canvas.font.height + inter
END setCanvas;


PROCEDURE resize* (width, height: INTEGER);
BEGIN
    size.X := width;
    size.Y := height;
    setPadding(padding.left, padding.top)
END resize;


PROCEDURE destroy* (VAR text: tText);
BEGIN
    IF search(text, "", FALSE, FALSE) THEN END;
    WHILE text.last # NIL DO
        DelLine(text, text.last(tLine))
    END;
    DISPOSE(text.foundList);
    DISPOSE(text.cursor);
    DISPOSE(text.select2);
    DISPOSE(text)
END destroy;


PROCEDURE open* (name: RW.tFileName; VAR errno: INTEGER): tText;
VAR
    text: tText;
    file: RW.tInput;
    n, enc: INTEGER;
    eol: BOOLEAN;
    line: tLine;
BEGIN
    errno := 0;
    text := NIL;
    file := RW.load(name, enc);
    IF file # NIL THEN
        text := create(name);
        text.enc := enc;
        REPEAT
            line := Lines.create(FALSE);
            n := RW.getString(file, line, eol);
            IF n >= 0 THEN
                List._append(text, line)
            ELSE
                Lines.destroy(line)
            END
        UNTIL n < 0;
        RW.destroy(file);
        IF n = -1 THEN
            IF text.count = 0 THEN
                List._append(text, Lines.create(FALSE))
            END;
            text.curLine := text.first(tLine);
            SetPos(text, 0, 0);
            resetSelect(text)
        END
    ELSE
        errno := 1
    END;
    IF (text # NIL) & (text.lang # Lang.langNone) THEN
        Comments(text)
    END
    RETURN text
END open;


PROCEDURE findNext* (text: tText; prev: BOOLEAN): BOOLEAN;
VAR
    cursorPos, x, y, X, Y, Len: INTEGER;
    p: Search.tPos;
    line: tLine;
    res: BOOLEAN;
BEGIN
    X := text.cursor.X;
    Y := text.cursor.Y;
    text.cursor.X := MIN(text.cursor.X, text.curLine.length);
    cursorPos := text.curLine.pos + text.cursor.X - ORD(prev) - ORD(~prev & (text.foundSel = 0));
    p := text.foundList.first(Search.tPos);
    WHILE (p # NIL) & (p.pos <= cursorPos) DO
        p := p.next(Search.tPos)
    END;
    IF prev THEN
        IF p = NIL THEN
            p := text.foundList.last(Search.tPos)
        ELSE
            p := p.prev(Search.tPos)
        END
    END;
    res := p # NIL;
    IF res THEN
        y := 0;
        line := text.first(tLine);
        WHILE (line.pos <= p.pos) & (line.next # NIL) DO
            NextLine(line);
            INC(y)
        END;
        IF (line.next # NIL) OR (line.pos > p.pos) THEN
            PrevLine(line);
            DEC(y)
        END;
        resetSelect(text);
        searchScroll(text, y);
        x := p.pos - line.pos;
        Len := LENGTH(text.searchText);
        IF x + Len > text.scroll.X + textsize.X THEN
            text.scroll.X := MAX(x + Len - textsize.X + 3, 0)
        ELSIF x < text.scroll.X THEN
            text.scroll.X := MAX(x - 3, 0)
        END;
        SetPos(text, x, y);
        text.foundSel := Len
    ELSE
        SetPos(text, X, Y)
    END
    RETURN res
END findNext;


PROCEDURE rewrite (line: tLine; repl: ARRAY OF WCHAR; pos, n: INTEGER);
BEGIN
    IF n > 0 THEN
        Lines.copy(line)
    END;
    WHILE n > 0 DO
        DEC(n);
        Lines.setChar(line, pos + n, repl[n])
    END
END rewrite;


PROCEDURE replace* (text: tText; s: ARRAY OF WCHAR; n: INTEGER);
VAR
    line: tLine;
    sLen, i: INTEGER;
BEGIN
    IF text.foundSel > 0 THEN
        line := text.curLine;
        sLen := LENGTH(s);
        i := text.cursor.X;
        IF sLen > n THEN
            Lines.insert3(line, i, sLen - n)
        END;
        SetPos(text, i + sLen, text.cursor.Y);
        rewrite(line, s, i, sLen);
        IF n > sLen THEN
            Lines.delCharN(line, text.cursor.X, n - sLen)
        END;
        resetSelect(text);
        Lines.modify(line);
        modify(text)
    END
END replace;


PROCEDURE replaceAll* (text: tText; s: ARRAY OF WCHAR; n: INTEGER): INTEGER;
VAR
    p: Search.tPos;
    line: tLine;
    y, k, d, pos, y0: INTEGER;
BEGIN
    resetSelect(text);
    SetPos(text, 0, 0);
    line := text.first(tLine);
    y := 0;
    y0 := -1;
    k := 0;
    d := LENGTH(s) - n;
    p := text.foundList.first(Search.tPos);
    WHILE p # NIL DO
        pos := p.pos;
        WHILE (line.pos <= pos) & (line.next # NIL) DO
            NextLine(line);
            INC(y)
        END;
        IF (line.next # NIL) OR (line.pos > pos) THEN
            PrevLine(line);
            DEC(y)
        END;
        IF y = y0 THEN
            INC(k, d)
        ELSE
            k := 0;
            y0 := y
        END;
        SetPos(text, pos - line.pos + k, y);
        text.foundSel := n;
        replace(text, s, n);
        p := p.next(Search.tPos)
    END
    RETURN text.foundList.count
END replaceAll;


PROCEDURE New* (): tText;
VAR
    text: tText;
BEGIN
    text := create("");
    List._append(text, Lines.create(FALSE));
    text.curLine := text.first(tLine);
    text.enc := E.CP866;
    SetPos(text, 0, 0);
    resetSelect(text)
    RETURN text
END New;


PROCEDURE empty;
END empty;


PROCEDURE init* (pShowCursor: tProcedure);
BEGIN
    ShowCursor := empty;
    IF pShowCursor # NIL THEN
        ShowCursor := pShowCursor
    END;
    pdelete := delete;
    drawCursor := TRUE;
    padding.left := pad_left;
    padding.top := pad_top;
END init;


END Text.