1 MODULE Texts; (** CAS/HM 7.10.93 -- interface based on Texts by JG/NW 6.12.91**)
(* Ported from Oberon V4 -- this version not depended on graphics *)
IMPORT
Files, Reals;
(*--- insert field e: Elem into Texts.Scanner and change Texts.Scan to set it in case of class=6 *)
CONST
ElemChar* = 1CX;
TAB = 9X; CR = 0DX; maxD = 9;
(**FileMsg.id**)
load* = 0; store* = 1;
(**Notifier op**)
replace* = 0; insert* = 1; delete* = 2;
(**Scanner.class**)
Inval* = 0; Name* = 1; String* = 2; Int* = 3; Real* = 4; LongReal* = 5; Char* = 6;
textTag = 0F0X; version = 01X;
TYPE
FontsFont = POINTER TO FontDesc;
FontDesc = RECORD
name: ARRAY 32 OF CHAR;
END;
Run = POINTER TO RunDesc;
RunDesc = RECORD
prev, next: Run;
len: LONGINT;
fnt: FontsFont;
col, voff: SHORTINT
END;
Piece = POINTER TO PieceDesc;
PieceDesc = RECORD (RunDesc)
file: Files.File;
org: LONGINT
END;
Elem* = POINTER TO ElemDesc;
Buffer* = POINTER TO BufDesc;
Text* = POINTER TO TextDesc;
ElemMsg* = RECORD END;
Handler* = PROCEDURE (e: Elem; VAR msg: ElemMsg);
ElemDesc* = RECORD (RunDesc)
W*, H*: LONGINT;
handle*: Handler;
base: Text
END;
FileMsg* = RECORD (ElemMsg)
id*: INTEGER;
pos*: LONGINT;
r*: Files.Rider
END;
CopyMsg* = RECORD (ElemMsg)
e*: Elem
END;
IdentifyMsg* = RECORD (ElemMsg)
mod*, proc*: ARRAY 32 OF CHAR
END;
BufDesc* = RECORD
len*: LONGINT;
head: Run
END;
Notifier* = PROCEDURE (T: Text; op: INTEGER; beg, end: LONGINT);
TextDesc* = RECORD
len*: LONGINT;
notify*: Notifier;
head, cache: Run;
corg: LONGINT
END;
Reader* = RECORD
eot*: BOOLEAN;
fnt*: FontsFont;
col*, voff*: SHORTINT;
elem*: Elem;
rider: Files.Rider;
run: Run;
org, off: LONGINT
END;
Scanner* = RECORD (Reader)
nextCh*: CHAR;
line*, class*: INTEGER;
i*: LONGINT;
x*: REAL;
y*: LONGREAL;
c*: CHAR;
len*: SHORTINT;
s*: ARRAY 32 OF CHAR
END;
Writer* = RECORD
buf*: Buffer;
fnt*: FontsFont;
col*, voff*: SHORTINT;
rider: Files.Rider;
file: Files.File
END;
Alien = POINTER TO RECORD (ElemDesc)
file: Files.File;
org, span: LONGINT;
mod, proc: ARRAY 32 OF CHAR
END;
VAR
new*: Elem;
del: Buffer;
(* run primitives *)
PROCEDURE Find (T: Text; VAR pos: LONGINT; VAR u: Run; VAR org, off: LONGINT);
VAR v: Run; m: LONGINT;
BEGIN
IF pos >= T.len THEN pos := T.len; u := T.head; org := T.len; off := 0; T.cache := T.head; T.corg := 0
ELSE v := T.cache.next; m := pos - T.corg;
IF pos >= T.corg THEN
WHILE m >= v.len DO DEC(m, v.len); v := v.next END
ELSE
WHILE m < 0 DO v := v.prev; INC(m, v.len) END;
END;
u := v; org := pos - m; off := m; T.cache := v.prev; T.corg := org
END
END Find;
PROCEDURE Split (off: LONGINT; VAR u, un: Run);
VAR p, U: Piece;
BEGIN
IF off = 0 THEN un := u; u := un.prev
ELSIF off >= u.len THEN un := u.next
ELSE NEW(p); un := p; U := u(Piece);
p^ := U^; INC(p.org, off); DEC(p.len, off); DEC(U.len, p.len);
p.prev := U; p.next := U.next; p.next.prev := p; U.next := p
END
END Split;
PROCEDURE Merge (T: Text; u: Run; VAR v: Run);
VAR p, q: Piece;
BEGIN
IF (u IS Piece) & (v IS Piece) & (u.fnt.name = v.fnt.name) & (u.col = v.col) & (u.voff = v.voff) THEN
p := u(Piece); q := v(Piece);
IF (p.file = q.file) & (p.org + p.len = q.org) THEN
IF T.cache = u THEN INC(T.corg, q.len)
ELSIF T.cache = v THEN T.cache := T.head; T.corg := 0
END;
INC(p.len, q.len); v := v.next
END
END
END Merge;
PROCEDURE Splice (un, v, w: Run; base: Text); (* (u, un) -> (u, v, w, un) *)
VAR u: Run;
BEGIN
IF v # w.next THEN u := un.prev;
u.next := v; v.prev := u; un.prev := w; w.next := un;
REPEAT
IF v IS Elem THEN v(Elem).base := base END;
v := v.next
UNTIL v = un
END
END Splice;
PROCEDURE ClonePiece (p: Piece): Piece;
VAR q: Piece;
BEGIN NEW(q); q^ := p^; RETURN q
END ClonePiece;
PROCEDURE CloneElem (e: Elem): Elem;
VAR msg: CopyMsg;
BEGIN msg.e := NIL; e.handle(e, msg); RETURN msg.e
END CloneElem;
(** Elements **)
PROCEDURE CopyElem* (SE, DE: Elem);
BEGIN DE.len := SE.len; DE.fnt := SE.fnt; DE.col := SE.col; DE.voff := SE.voff;
DE.W := SE.W; DE.H := SE.H; DE.handle := SE.handle
END CopyElem;
PROCEDURE ElemBase* (E: Elem): Text;
BEGIN RETURN E.base
END ElemBase;
PROCEDURE ElemPos* (E: Elem): LONGINT;
VAR u: Run; pos: LONGINT;
BEGIN u := E.base.head.next; pos := 0;
WHILE u # E DO pos := pos + u.len; u := u.next END;
RETURN pos
END ElemPos;
PROCEDURE HandleAlien (E: Elem; VAR msg: ElemMsg);
VAR e: Alien; r: Files.Rider; i: LONGINT; ch: CHAR;
BEGIN
WITH E: Alien DO
IF msg IS CopyMsg THEN
(*
WITH msg: CopyMsg DO NEW(e); CopyElem(E, e);
e.file := E.file; e.org := E.org; e.span := E.span; e.mod := E.mod; e.proc := E.proc;
msg.e := e
END
*)
ELSIF msg IS IdentifyMsg THEN
WITH msg: IdentifyMsg DO
COPY(E.mod, msg.mod); COPY(E.proc, msg.proc); msg.mod[31] := 1X (*alien*)
END
ELSIF msg IS FileMsg THEN
WITH msg: FileMsg DO
IF msg.id = store THEN Files.Set(r, E.file, E.org); i := E.span;
WHILE i > 0 DO Files.Read(r, ch); Files.Write(msg.r, ch); DEC(i) END
END
END
END
END
END HandleAlien;
(** Buffers **)
PROCEDURE OpenBuf* (B: Buffer);
VAR u: Run;
BEGIN NEW(u); u.next := u; u.prev := u; B.head := u; B.len := 0
END OpenBuf;
PROCEDURE Copy* (SB, DB: Buffer);
VAR u, v, vn: Run;
BEGIN u := SB.head.next; v := DB.head.prev;
WHILE u # SB.head DO
IF u IS Piece THEN vn := ClonePiece(u(Piece)) ELSE vn := CloneElem(u(Elem)) END;
v.next := vn; vn.prev := v; v := vn; u := u.next
END;
v.next := DB.head; DB.head.prev := v;
INC(DB.len, SB.len)
END Copy;
PROCEDURE Recall* (VAR B: Buffer);
BEGIN B := del; del := NIL
END Recall;
(** Texts **)
PROCEDURE Save* (T: Text; beg, end: LONGINT; B: Buffer);
VAR u, v, w, wn: Run; uo, ud, vo, vd: LONGINT;
BEGIN Find(T, beg, u, uo, ud); Find(T, end, v, vo, vd);
w := B.head.prev;
WHILE u # v DO
IF u IS Piece THEN wn := ClonePiece(u(Piece)); DEC(wn.len, ud); INC(wn(Piece).org, ud)
ELSE wn := CloneElem(u(Elem))
END;
w.next := wn; wn.prev := w; w := wn; u := u.next; ud := 0
END;
IF vd > 0 THEN (*v IS Piece*) wn := ClonePiece(v(Piece)); wn.len := vd - ud; INC(wn(Piece).org, ud);
w.next := wn; wn.prev := w; w := wn
END;
w.next := B.head; B.head.prev := w;
INC(B.len, end - beg)
END Save;
PROCEDURE Insert* (T: Text; pos: LONGINT; B: Buffer);
VAR u, un, v: Run; p, q: Piece; uo, ud, len: LONGINT;
BEGIN Find(T, pos, u, uo, ud); Split(ud, u, un);
len := B.len; v := B.head.next;
Merge(T, u, v); Splice(un, v, B.head.prev, T);
INC(T.len, len); B.head.next := B.head; B.head.prev := B.head; B.len := 0;
T.notify(T, insert, pos, pos + len)
END Insert;
PROCEDURE Append* (T: Text; B: Buffer);
VAR v: Run; pos, len: LONGINT;
BEGIN pos := T.len; len := B.len; v := B.head.next;
Merge(T, T.head.prev, v); Splice(T.head, v, B.head.prev, T);
INC(T.len, len); B.head.next := B.head; B.head.prev := B.head; B.len := 0;
T.notify(T, insert, pos, pos + len)
END Append;
PROCEDURE Delete* (T: Text; beg, end: LONGINT);
VAR c, u, un, v, vn: Run; co, uo, ud, vo, vd: LONGINT;
BEGIN
Find(T, beg, u, uo, ud); Split(ud, u, un); c := T.cache; co := T.corg;
Find(T, end, v, vo, vd); Split(vd, v, vn); T.cache := c; T.corg := co;
NEW(del); OpenBuf(del); del.len := end - beg;
Splice(del.head, un, v, NIL);
Merge(T, u, vn); u.next := vn; vn.prev := u;
DEC(T.len, end - beg);
T.notify(T, delete, beg, end)
END Delete;
PROCEDURE ChangeLooks* (T: Text; beg, end: LONGINT; sel: SET; fnt: FontsFont; col, voff: SHORTINT);
VAR c, u, un, v, vn: Run; co, uo, ud, vo, vd: LONGINT;
BEGIN Find(T, beg, u, uo, ud); Split(ud, u, un); c := T.cache; co := T.corg;
Find(T, end, v, vo, vd); Split(vd, v, vn); T.cache := c; T.corg := co;
WHILE un # vn DO
IF (0 IN sel) & (fnt # NIL) THEN un.fnt := fnt END;
IF 1 IN sel THEN un.col := col END;
IF 2 IN sel THEN un.voff := voff END;
Merge(T, u, un);
IF u.next = un THEN u := un; un := un.next ELSE u.next := un; un.prev := u END
END;
Merge(T, u, un); u.next := un; un.prev := u;
T.notify(T, replace, beg, end)
END ChangeLooks;
(** Readers **)
PROCEDURE OpenReader* (VAR R: Reader; T: Text; pos: LONGINT);
VAR u: Run;
BEGIN
IF pos >= T.len THEN pos := T.len END;
Find(T, pos, u, R.org, R.off); R.run := u; R.eot := FALSE;
IF u IS Piece THEN
Files.Set(R.rider, u(Piece).file, u(Piece).org + R.off)
END
END OpenReader;
PROCEDURE Read* (VAR R: Reader; VAR ch: CHAR);
VAR u: Run;
BEGIN u := R.run; R.fnt := u.fnt; R.col := u.col; R.voff := u.voff; INC(R.off);
IF u IS Piece THEN Files.Read(R.rider, ch); R.elem := NIL
ELSIF u IS Elem THEN ch := ElemChar; R.elem := u(Elem)
ELSE ch := 0X; R.elem := NIL; R.eot := TRUE
END;
IF R.off = u.len THEN INC(R.org, u.len); u := u.next;
IF u IS Piece THEN
WITH u: Piece DO Files.Set(R.rider, u.file, u.org) END
END;
R.run := u; R.off := 0
END
END Read;
PROCEDURE ReadElem* (VAR R: Reader);
VAR u, un: Run;
BEGIN u := R.run;
WHILE u IS Piece DO INC(R.org, u.len); u := u.next END;
IF u IS Elem THEN un := u.next; R.run := un; INC(R.org); R.off := 0;
R.fnt := u.fnt; R.col := u.col; R.voff := u.voff; R.elem := u(Elem);
IF un IS Piece THEN
WITH un: Piece DO Files.Set(R.rider, un.file, un.org) END
END
ELSE R.eot := TRUE; R.elem := NIL
END
END ReadElem;
PROCEDURE ReadPrevElem* (VAR R: Reader);
VAR u: Run;
BEGIN u := R.run.prev;
WHILE u IS Piece DO DEC(R.org, u.len); u := u.prev END;
IF u IS Elem THEN R.run := u; DEC(R.org); R.off := 0;
R.fnt := u.fnt; R.col := u.col; R.voff := u.voff; R.elem := u(Elem)
ELSE R.eot := TRUE; R.elem := NIL
END
END ReadPrevElem;
PROCEDURE Pos* (VAR R: Reader): LONGINT;
BEGIN RETURN R.org + R.off
END Pos;
(** Scanners --------------- NW --------------- **)
PROCEDURE OpenScanner* (VAR S: Scanner; T: Text; pos: LONGINT);
BEGIN OpenReader(S, T, pos); S.line := 0; S.nextCh := " "
END OpenScanner;
(*IEEE floating point formats:
x = 2^(e-127) * 1.m bit 0: sign, bits 1- 8: e, bits 9-31: m
x = 2^(e-1023) * 1.m bit 0: sign, bits 1-11: e, bits 12-63: m *)
PROCEDURE Scan* (VAR S: Scanner);
CONST maxD = 32;
VAR ch, term: CHAR;
neg, negE, hex: BOOLEAN;
i, j, h: SHORTINT;
e: INTEGER; k: LONGINT;
x, f: REAL; y, g: LONGREAL;
d: ARRAY maxD OF CHAR;
PROCEDURE ReadScaleFactor;
BEGIN Read(S, ch);
IF ch = "-" THEN negE := TRUE; Read(S, ch)
ELSE negE := FALSE;
IF ch = "+" THEN Read(S, ch) END
END;
WHILE ("0" <= ch) & (ch <= "9") DO
e := e*10 + ORD(ch) - 30H; Read(S, ch)
END
END ReadScaleFactor;
BEGIN ch := S.nextCh; i := 0;
LOOP
IF ch = CR THEN INC(S.line)
ELSIF (ch # " ") & (ch # TAB) THEN EXIT
END ;
Read(S, ch)
END;
IF ("A" <= CAP(ch)) & (CAP(ch) <= "Z") THEN (*name*)
REPEAT S.s[i] := ch; INC(i); Read(S, ch)
UNTIL (CAP(ch) > "Z")
OR ("A" > CAP(ch)) & (ch > "9")
OR ("0" > ch) & (ch # ".")
OR (i = 31);
S.s[i] := 0X; S.len := i; S.class := 1
ELSIF ch = 22X THEN (*literal string*)
Read(S, ch);
WHILE (ch # 22X) & (ch >= " ") & (i # 31) DO
S.s[i] := ch; INC(i); Read(S, ch)
END;
S.s[i] := 0X; S.len := i; Read(S, ch); S.class := 2
ELSE
IF ch = "-" THEN neg := TRUE; Read(S, ch) ELSE neg := FALSE END ;
IF ("0" <= ch) & (ch <= "9") THEN (*number*)
hex := FALSE; j := 0;
LOOP d[i] := ch; INC(i); Read(S, ch);
IF ch < "0" THEN EXIT END;
IF "9" < ch THEN
IF ("A" <= ch) & (ch <= "F") THEN hex := TRUE; ch := CHR(ORD(ch)-7)
ELSIF ("a" <= ch) & (ch <= "f") THEN hex := TRUE; ch := CHR(ORD(ch)-27H)
ELSE EXIT
END
END
END;
IF ch = "H" THEN (*hex number*)
Read(S, ch); S.class := 3;
IF i-j > 8 THEN j := i-8 END ;
k := ORD(d[j]) - 30H; INC(j);
IF (i-j = 7) & (k >= 8) THEN DEC(k, 16) END ;
WHILE j < i DO k := k*10H + (ORD(d[j]) - 30H); INC(j) END ;
IF neg THEN S.i := -k ELSE S.i := k END
ELSIF ch = "." THEN (*read real*)
Read(S, ch); h := i;
WHILE ("0" <= ch) & (ch <= "9") DO d[i] := ch; INC(i); Read(S, ch) END ;
IF ch = "D" THEN
e := 0; y := 0; g := 1;
REPEAT y := y*10 + (ORD(d[j]) - 30H); INC(j) UNTIL j = h;
WHILE j < i DO g := g/10; y := (ORD(d[j]) - 30H)*g + y; INC(j) END ;
ReadScaleFactor;
IF negE THEN
IF e <= 308 THEN y := y / Reals.TenL(e) ELSE y := 0 END
ELSIF e > 0 THEN
IF e <= 308 THEN y := Reals.TenL(e) * y ELSE HALT(40) END
END ;
IF neg THEN y := -y END ;
S.class := 5; S.y := y
ELSE e := 0; x := 0; f := 1;
REPEAT x := x*10 + (ORD(d[j]) - 30H); INC(j) UNTIL j = h;
WHILE j < i DO f := f/10; x := (ORD(d[j])-30H)*f + x; INC(j) END;
IF ch = "E" THEN ReadScaleFactor END ;
IF negE THEN
IF e <= 38 THEN x := x / Reals.Ten(e) ELSE x := 0 END
ELSIF e > 0 THEN
IF e <= 38 THEN x := Reals.Ten(e) * x ELSE HALT(40) END
END ;
IF neg THEN x := -x END ;
S.class := 4; S.x := x
END ;
IF hex THEN S.class := 0 END
ELSE (*decimal integer*)
S.class := 3; k := 0;
REPEAT k := k*10 + (ORD(d[j]) - 30H); INC(j) UNTIL j = i;
IF neg THEN S.i := -k ELSE S.i := k END;
IF hex THEN S.class := 0 ELSE S.class := 3 END
END
ELSE S.class := 6;
IF neg THEN S.c := "-" ELSE S.c := ch; Read(S, ch) END
END
END;
S.nextCh := ch
END Scan;
(** Writers **)
PROCEDURE OpenWriter* (VAR W: Writer);
BEGIN NEW(W.buf); OpenBuf(W.buf);
(* W.fnt := Fonts.Default; W.col := Display.white; *)
W.fnt := NIL; W.col := 0; W.voff := 0;
W.file := Files.New(""); Files.Set(W.rider, W.file, 0)
END OpenWriter;
PROCEDURE SetFont* (VAR W: Writer; fnt: FontsFont);
BEGIN W.fnt := fnt
END SetFont;
PROCEDURE SetColor* (VAR W: Writer; col: SHORTINT);
BEGIN W.col := col
END SetColor;
PROCEDURE SetOffset* (VAR W: Writer; voff: SHORTINT);
BEGIN W.voff := voff
END SetOffset;
PROCEDURE Write* (VAR W: Writer; ch: CHAR);
VAR u, un: Run; p: Piece;
BEGIN Files.Write(W.rider, ch); INC(W.buf.len); un := W.buf.head; u := un.prev;
IF (u IS Piece) & (u(Piece).file = W.file) & (u.fnt.name = W.fnt.name) & (u.col = W.col) & (u.voff = W.voff) THEN
INC(u.len)
ELSE NEW(p); u.next := p; p.prev := u; p.next := un; un.prev := p;
p.len := 1; p.fnt := W.fnt; p.col := W.col; p.voff := W.voff;
p.file := W.file; p.org := Files.Length(W.file) - 1
END
END Write;
PROCEDURE WriteElem* (VAR W: Writer; e: Elem);
VAR u, un: Run;
BEGIN
IF e.base # NIL THEN HALT(99) END;
INC(W.buf.len); e.len := 1; e.fnt := W.fnt; e.col := W.col; e.voff := W.voff;
un := W.buf.head; u := un.prev; u.next := e; e.prev := u; e.next := un; un.prev := e
END WriteElem;
PROCEDURE WriteLn* (VAR W: Writer);
BEGIN Write(W, CR)
END WriteLn;
PROCEDURE WriteString* (VAR W: Writer; s: ARRAY OF CHAR);
VAR i: INTEGER;
BEGIN i := 0;
WHILE s[i] >= " " DO Write(W, s[i]); INC(i) END
END WriteString;
PROCEDURE WriteInt* (VAR W: Writer; x, n: LONGINT);
VAR i: INTEGER; x0: LONGINT;
a: ARRAY 11 OF CHAR;
BEGIN i := 0;
IF x < 0 THEN
IF x = MIN(LONGINT) THEN WriteString(W, " -2147483648"); RETURN
ELSE DEC(n); x0 := -x
END
ELSE x0 := x
END;
REPEAT
a[i] := CHR(x0 MOD 10 + 30H); x0 := x0 DIV 10; INC(i)
UNTIL x0 = 0;
WHILE n > i DO Write(W, " "); DEC(n) END;
IF x < 0 THEN Write(W, "-") END;
REPEAT DEC(i); Write(W, a[i]) UNTIL i = 0
END WriteInt;
PROCEDURE WriteHex* (VAR W: Writer; x: LONGINT);
VAR i: INTEGER; y: LONGINT;
a: ARRAY 10 OF CHAR;
BEGIN i := 0; Write(W, " ");
REPEAT y := x MOD 10H;
IF y < 10 THEN a[i] := CHR(y + 30H) ELSE a[i] := CHR(y + 37H) END;
x := x DIV 10H; INC(i)
UNTIL i = 8;
REPEAT DEC(i); Write(W, a[i]) UNTIL i = 0
END WriteHex;
PROCEDURE WriteReal* (VAR W: Writer; x: REAL; n: INTEGER);
VAR e: INTEGER; x0: REAL;
d: ARRAY maxD OF CHAR;
BEGIN e := Reals.Expo(x);
IF e = 0 THEN
WriteString(W, " 0");
REPEAT Write(W, " "); DEC(n) UNTIL n <= 3
ELSIF e = 255 THEN
WriteString(W, " NaN");
WHILE n > 4 DO Write(W, " "); DEC(n) END
ELSE
IF n <= 9 THEN n := 3 ELSE DEC(n, 6) END;
REPEAT Write(W, " "); DEC(n) UNTIL n <= 8;
(*there are 2 < n <= 8 digits to be written*)
IF x < 0.0 THEN Write(W, "-"); x := -x ELSE Write(W, " ") END;
e := (e - 127) * 77 DIV 256;
IF e >= 0 THEN x := x / Reals.Ten(e) ELSE x := Reals.Ten(-e) * x END;
IF x >= 10.0 THEN x := 0.1*x; INC(e) END;
x0 := Reals.Ten(n-1); x := x0*x + 0.5;
IF x >= 10.0*x0 THEN x := x*0.1; INC(e) END;
Reals.Convert(x, n, d);
DEC(n); Write(W, d[n]); Write(W, ".");
REPEAT DEC(n); Write(W, d[n]) UNTIL n = 0;
Write(W, "E");
IF e < 0 THEN Write(W, "-"); e := -e ELSE Write(W, "+") END;
Write(W, CHR(e DIV 10 + 30H)); Write(W, CHR(e MOD 10 + 30H))
END
END WriteReal;
PROCEDURE WriteRealFix* (VAR W: Writer; x: REAL; n, k: INTEGER);
VAR e, i: INTEGER; sign: CHAR; x0: REAL;
d: ARRAY maxD OF CHAR;
PROCEDURE seq(ch: CHAR; n: INTEGER);
BEGIN WHILE n > 0 DO Write(W, ch); DEC(n) END
END seq;
PROCEDURE dig(n: INTEGER);
BEGIN
WHILE n > 0 DO
DEC(i); Write(W, d[i]); DEC(n)
END
END dig;
BEGIN e := Reals.Expo(x);
IF k < 0 THEN k := 0 END;
IF e = 0 THEN seq(" ", n-k-2); Write(W, "0"); seq(" ", k+1)
ELSIF e = 255 THEN WriteString(W, " NaN"); seq(" ", n-4)
ELSE e := (e - 127) * 77 DIV 256;
IF x < 0 THEN sign := "-"; x := -x ELSE sign := " " END;
IF e >= 0 THEN (*x >= 1.0, 77/256 = log 2*) x := x/Reals.Ten(e)
ELSE (*x < 1.0*) x := Reals.Ten(-e) * x
END;
IF x >= 10.0 THEN x := 0.1*x; INC(e) END;
(* 1 <= x < 10 *)
IF k+e >= maxD-1 THEN k := maxD-1-e
ELSIF k+e < 0 THEN k := -e; x := 0.0
END;
x0 := Reals.Ten(k+e); x := x0*x + 0.5;
IF x >= 10.0*x0 THEN INC(e) END;
(*e = no. of digits before decimal point*)
INC(e); i := k+e; Reals.Convert(x, i, d);
IF e > 0 THEN
seq(" ", n-e-k-2); Write(W, sign); dig(e);
Write(W, "."); dig(k)
ELSE seq(" ", n-k-3);
Write(W, sign); Write(W, "0"); Write(W, ".");
seq("0", -e); dig(k+e)
END
END
END WriteRealFix;
PROCEDURE WriteRealHex* (VAR W: Writer; x: REAL);
VAR i: INTEGER;
d: ARRAY 8 OF CHAR;
BEGIN Reals.ConvertH(x, d); i := 0;
REPEAT Write(W, d[i]); INC(i) UNTIL i = 8
END WriteRealHex;
PROCEDURE WriteLongReal* (VAR W: Writer; x: LONGREAL; n: INTEGER);
CONST maxD = 16;
VAR e: INTEGER; x0: LONGREAL;
d: ARRAY maxD OF CHAR;
BEGIN e := Reals.ExpoL(x);
IF e = 0 THEN
WriteString(W, " 0");
REPEAT Write(W, " "); DEC(n) UNTIL n <= 3
ELSIF e = 2047 THEN
WriteString(W, " NaN");
WHILE n > 4 DO Write(W, " "); DEC(n) END
ELSE
IF n <= 10 THEN n := 3 ELSE DEC(n, 7) END;
REPEAT Write(W, " "); DEC(n) UNTIL n <= maxD;
(*there are 2 <= n <= maxD digits to be written*)
IF x < 0 THEN Write(W, "-"); x := -x ELSE Write(W, " ") END;
e := SHORT(LONG(e - 1023) * 77 DIV 256);
IF e >= 0 THEN x := x / Reals.TenL(e) ELSE x := Reals.TenL(-e) * x END ;
IF x >= 10.0D0 THEN x := 0.1D0 * x; INC(e) END ;
x0 := Reals.TenL(n-1); x := x0*x + 0.5D0;
IF x >= 10.0D0*x0 THEN x := 0.1D0 * x; INC(e) END ;
Reals.ConvertL(x, n, d);
DEC(n); Write(W, d[n]); Write(W, ".");
REPEAT DEC(n); Write(W, d[n]) UNTIL n = 0;
Write(W, "D");
IF e < 0 THEN Write(W, "-"); e := -e ELSE Write(W, "+") END;
Write(W, CHR(e DIV 100 + 30H)); e := e MOD 100;
Write(W, CHR(e DIV 10 + 30H));
Write(W, CHR(e MOD 10 + 30H))
END
END WriteLongReal;
PROCEDURE WriteLongRealHex* (VAR W: Writer; x: LONGREAL);
VAR i: INTEGER;
d: ARRAY 16 OF CHAR;
BEGIN Reals.ConvertHL(x, d); i := 0;
REPEAT Write(W, d[i]); INC(i) UNTIL i = 16
END WriteLongRealHex;
PROCEDURE WriteDate* (VAR W: Writer; t, d: LONGINT);
PROCEDURE WritePair(ch: CHAR; x: LONGINT);
BEGIN Write(W, ch);
Write(W, CHR(x DIV 10 + 30H)); Write(W, CHR(x MOD 10 + 30H))
END WritePair;
BEGIN
WritePair(" ", d MOD 32); WritePair(".", d DIV 32 MOD 16); WritePair(".", d DIV 512 MOD 128);
WritePair(" ", t DIV 4096 MOD 32); WritePair(":", t DIV 64 MOD 64); WritePair(":", t MOD 64)
END WriteDate;
(** Text Filing **)
PROCEDURE Load0 (VAR r: Files.Rider; T: Text);
VAR u, un: Run; p: Piece; e: Elem;
org, pos, hlen, plen: LONGINT; ecnt, fno, fcnt, col, voff: SHORTINT;
f: Files.File;
msg: FileMsg;
mods, procs: ARRAY 64, 32 OF CHAR;
name: ARRAY 32 OF CHAR;
fnts: ARRAY 32 OF FontsFont;
PROCEDURE LoadElem (VAR r: Files.Rider; pos, span: LONGINT; VAR e: Elem);
VAR (* M: Modules.Module; Cmd: Modules.Command; *) a: Alien;
org, ew, eh: LONGINT; eno: SHORTINT;
BEGIN new := NIL;
Files.ReadLInt(r, ew); Files.ReadLInt(r, eh); Files.Read(r, eno);
IF eno > ecnt THEN ecnt := eno; Files.ReadString(r, mods[eno]); Files.ReadString(r, procs[eno]) END;
org := Files.Pos(r); (* M := Modules.ThisMod(mods[eno]);
IF M # NIL THEN Cmd := Modules.ThisCommand(M, procs[eno]);
IF Cmd # NIL THEN Cmd END
END; *)
e := new;
IF e # NIL THEN e.W := ew; e.H := eh; e.base := T;
msg.pos := pos; e.handle(e, msg);
IF Files.Pos(r) # org + span THEN e := NIL END
END;
IF e = NIL THEN Files.Set(r, f, org + span);
NEW(a); a.W := ew; a.H := eh; a.handle := HandleAlien; a.base := T;
a.file := f; a.org := org; a.span := span;
COPY(mods[eno], a.mod); COPY(procs[eno], a.proc);
e := a
END
END LoadElem;
BEGIN pos := Files.Pos(r); f := Files.Base(r);
NEW(u); u.len := MAX(LONGINT); (*u.fnt := Fonts.Default;*)u.fnt := NIL; (*u.col := Display.white;*) u.col := 0;
T.head := u; ecnt := 0; fcnt := 0;
msg.id := load; msg.r := r;
Files.ReadLInt(msg.r, hlen); (*!!!org := pos + hlen;*) org := pos -2 + hlen; pos := org; Files.Read(msg.r, fno);
WHILE fno # 0 DO
IF fno > fcnt THEN fcnt := fno; Files.ReadString(msg.r, name); (* fnts[fno] := Fonts.This(name) *) fnts[fno] := NIL END;
Files.Read(msg.r, col); Files.Read(msg.r, voff); Files.ReadLInt(msg.r, plen);
IF plen > 0 THEN NEW(p); p.file := f; p.org := pos; un := p; un.len := plen
ELSE LoadElem(msg.r, pos - org, -plen, e); un := e; un.len := 1
END;
un.fnt := fnts[fno]; un.col := col; un.voff := voff;
INC(pos, un.len); u.next := un; un.prev := u; u := un; Files.Read(msg.r, fno)
END;
u.next := T.head; T.head.prev := u; T.cache := T.head; T.corg := 0;
Files.ReadLInt(msg.r, T.len); Files.Set(r, f, Files.Pos(msg.r) + T.len)
END Load0;
PROCEDURE Load* (VAR r: Files.Rider; T: Text);
CONST oldTag = -4095;
VAR tag: INTEGER;
BEGIN
(* for compatibility inner text tags are checked and skipped; remove this in a later version *)
Files.ReadInt(r, tag); IF tag # oldTag THEN Files.Set(r, Files.Base(r), Files.Pos(r)-2) END;
Load0(r, T)
END Load;
PROCEDURE Open* (T: Text; name: ARRAY OF CHAR);
VAR f: Files.File; r: Files.Rider; u: Run; p: Piece; tag, version: CHAR;
BEGIN f := Files.Old(name);
IF f = NIL THEN f := Files.New("") END;
Files.Set(r, f, 0); Files.Read(r, tag); Files.Read(r, version);
IF (tag = textTag) OR (tag = 01X) & (version = textTag) THEN Load0(r, T)
ELSE NEW(u); u.len := MAX(LONGINT); u.fnt := NIL; (* u.col := Display.white; *) u.col := 0;
T.len := Files.Length(f);
IF T.len > 0 THEN NEW(p); p.len := T.len; (* p.fnt := Fonts.Default; *) p.fnt := NIL;
(* p.col := Display.white; *) p.col := 0; p.voff := 0; p.file := f; p.org := 0;
u.next := p; u.prev := p; p.next := u; p.prev := u
ELSE u.next := u; u.prev := u
END;
T.head := u; T.cache := T.head; T.corg := 0
END
END Open;
PROCEDURE Store* (VAR r: Files.Rider; T: Text);
VAR r1: Files.Rider; u, un: Run; e: Elem; org, pos, delta, hlen, rlen: LONGINT; ecnt, fno, fcnt: SHORTINT;
msg: FileMsg; iden: IdentifyMsg;
mods, procs: ARRAY 64, 32 OF CHAR;
fnts: ARRAY 32 OF FontsFont;
block: ARRAY 1024 OF CHAR;
PROCEDURE StoreElem (VAR r: Files.Rider; pos: LONGINT; e: Elem);
VAR r1: Files.Rider; org, span: LONGINT; eno: SHORTINT;
BEGIN COPY(iden.mod, mods[ecnt]); COPY(iden.proc, procs[ecnt]); eno := 1;
WHILE (mods[eno] # iden.mod) OR (procs[eno] # iden.proc) DO INC(eno) END;
Files.Set(r1, Files.Base(r), Files.Pos(r));
Files.WriteLInt(r, 0); Files.WriteLInt(r, 0); Files.WriteLInt(r, 0); (*fixup slot*)
Files.Write(r, eno);
IF eno = ecnt THEN INC(ecnt); Files.WriteString(r, iden.mod); Files.WriteString(r, iden.proc) END;
msg.pos := pos; org := Files.Pos(r); e.handle(e, msg); span := Files.Pos(r) - org;
Files.WriteLInt(r1, -span); Files.WriteLInt(r1, e.W); Files.WriteLInt(r1, e.H) (*fixup*)
END StoreElem;
BEGIN
org := Files.Pos(r); msg.id := store; msg.r := r; Files.WriteLInt(msg.r, 0); (*fixup slot*)
u := T.head.next; pos := 0; delta := 0; fcnt := 1; ecnt := 1;
WHILE u # T.head DO
IF u IS Elem THEN iden.mod[0] := 0X; u(Elem).handle(u(Elem), iden) ELSE iden.mod[0] := 1X END;
IF iden.mod[0] # 0X THEN
fnts[fcnt] := u.fnt; fno := 1;
WHILE fnts[fno].name # u.fnt.name DO INC(fno) END;
Files.Write(msg.r, fno);
IF fno = fcnt THEN INC(fcnt); Files.WriteString(msg.r, u.fnt.name) END;
Files.Write(msg.r, u.col); Files.Write(msg.r, u.voff)
END;
IF u IS Piece THEN rlen := u.len; un := u.next;
WHILE (un IS Piece) & (un.fnt = u.fnt) & (un.col = u.col) & (un.voff = u.voff) DO
INC(rlen, un.len); un := un.next
END;
Files.WriteLInt(msg.r, rlen); INC(pos, rlen); u := un
ELSIF iden.mod[0] # 0X THEN StoreElem(msg.r, pos, u(Elem)); INC(pos); u := u.next
ELSE INC(delta); u := u.next
END
END;
Files.Write(msg.r, 0); Files.WriteLInt(msg.r, T.len - delta);
(*!!!hlen := Files.Pos(msg.r) - org;*) hlen := Files.Pos(msg.r) - org + 2;
Files.Set(r1, Files.Base(msg.r), org); Files.WriteLInt(r1, hlen); (*fixup*)
u := T.head.next;
WHILE u # T.head DO
IF u IS Piece THEN
WITH u: Piece DO Files.Set(r1, u.file, u.org); delta := u.len;
WHILE delta > LEN(block) DO Files.ReadBytes(r1, block, LEN(block));
Files.WriteBytes(msg.r, block, LEN(block)); DEC(delta, LEN(block))
END;
Files.ReadBytes(r1, block, delta); Files.WriteBytes(msg.r, block, delta)
END
ELSE iden.mod[0] := 0X; u(Elem).handle(u(Elem), iden);
IF iden.mod[0] # 0X THEN Files.Write(msg.r, ElemChar) END
END;
u := u.next
END;
r := msg.r;
END Store;
PROCEDURE Close* (T: Text; name: ARRAY OF CHAR);
VAR f: Files.File; r: Files.Rider; i, res: INTEGER; bak: ARRAY 64 OF CHAR;
BEGIN
f := Files.New(name); Files.Set(r, f, 0); Files.Write(r, textTag); Files.Write(r, version); Store(r, T);
i := 0; WHILE name[i] # 0X DO INC(i) END;
COPY(name, bak); bak[i] := "."; bak[i+1] := "B"; bak[i+2] := "a"; bak[i+3] := "k"; bak[i+4] := 0X;
Files.Rename(name, bak, res); Files.Register(f)
END Close;
BEGIN del := NIL
END Texts.