(*
Copyright 2016, 2018 Anton Krotov
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*)
MODULE Out;
IMPORT ConsoleLib, sys := SYSTEM;
CONST
d = 1.0 - 5.0E-12;
VAR
Realp: PROCEDURE (x: REAL; width: INTEGER);
PROCEDURE Char*(c: CHAR);
BEGIN
ConsoleLib.write_string(sys.ADR(c), 1)
END Char;
PROCEDURE String*(s: ARRAY OF CHAR);
BEGIN
ConsoleLib.write_string(sys.ADR(s[0]), LENGTH(s))
END String;
PROCEDURE WriteInt(x, n: INTEGER);
VAR i: INTEGER; a: ARRAY 16 OF CHAR; neg: BOOLEAN;
BEGIN
i := 0;
IF n < 1 THEN
n := 1
END;
IF x < 0 THEN
x := -x;
DEC(n);
neg := TRUE
END;
REPEAT
a[i] := CHR(x MOD 10 + ORD("0"));
x := x DIV 10;
INC(i)
UNTIL x = 0;
WHILE n > i DO
Char(" ");
DEC(n)
END;
IF neg THEN
Char("-")
END;
REPEAT
DEC(i);
Char(a[i])
UNTIL i = 0
END WriteInt;
PROCEDURE IsNan(AValue: REAL): BOOLEAN;
VAR h, l: SET;
BEGIN
sys.GET(sys.ADR(AValue), l);
sys.GET(sys.ADR(AValue) + 4, h)
RETURN (h * {20..30} = {20..30}) & ((h * {0..19} # {}) OR (l * {0..31} # {}))
END IsNan;
PROCEDURE IsInf(x: REAL): BOOLEAN;
RETURN ABS(x) = sys.INF()
END IsInf;
PROCEDURE Int*(x, width: INTEGER);
VAR i: INTEGER;
BEGIN
IF x # 80000000H THEN
WriteInt(x, width)
ELSE
FOR i := 12 TO width DO
Char(20X)
END;
String("-2147483648")
END
END Int;
PROCEDURE OutInf(x: REAL; width: INTEGER);
VAR s: ARRAY 5 OF CHAR; i: INTEGER;
BEGIN
IF IsNan(x) THEN
s := "Nan";
INC(width)
ELSIF IsInf(x) & (x > 0.0) THEN
s := "+Inf"
ELSIF IsInf(x) & (x < 0.0) THEN
s := "-Inf"
END;
FOR i := 1 TO width - 4 DO
Char(" ")
END;
String(s)
END OutInf;
PROCEDURE Ln*;
BEGIN
Char(0DX);
Char(0AX)
END Ln;
PROCEDURE _FixReal(x: REAL; width, p: INTEGER);
VAR e, len, i: INTEGER; y: REAL; minus: BOOLEAN;
BEGIN
IF IsNan(x) OR IsInf(x) THEN
OutInf(x, width)
ELSIF p < 0 THEN
Realp(x, width)
ELSE
len := 0;
minus := FALSE;
IF x < 0.0 THEN
minus := TRUE;
INC(len);
x := ABS(x)
END;
e := 0;
WHILE x >= 10.0 DO
x := x / 10.0;
INC(e)
END;
IF e >= 0 THEN
len := len + e + p + 1;
IF x > 9.0 + d THEN
INC(len)
END;
IF p > 0 THEN
INC(len)
END
ELSE
len := len + p + 2
END;
FOR i := 1 TO width - len DO
Char(" ")
END;
IF minus THEN
Char("-")
END;
y := x;
WHILE (y < 1.0) & (y # 0.0) DO
y := y * 10.0;
DEC(e)
END;
IF e < 0 THEN
IF x - FLT(FLOOR(x)) > d THEN
Char("1");
x := 0.0
ELSE
Char("0");
x := x * 10.0
END
ELSE
WHILE e >= 0 DO
IF x - FLT(FLOOR(x)) > d THEN
IF x > 9.0 THEN
String("10")
ELSE
Char(CHR(FLOOR(x) + ORD("0") + 1))
END;
x := 0.0
ELSE
Char(CHR(FLOOR(x) + ORD("0")));
x := (x - FLT(FLOOR(x))) * 10.0
END;
DEC(e)
END
END;
IF p > 0 THEN
Char(".")
END;
WHILE p > 0 DO
IF x - FLT(FLOOR(x)) > d THEN
Char(CHR(FLOOR(x) + ORD("0") + 1));
x := 0.0
ELSE
Char(CHR(FLOOR(x) + ORD("0")));
x := (x - FLT(FLOOR(x))) * 10.0
END;
DEC(p)
END
END
END _FixReal;
PROCEDURE Real*(x: REAL; width: INTEGER);
VAR e, n, i: INTEGER; minus: BOOLEAN;
BEGIN
IF IsNan(x) OR IsInf(x) THEN
OutInf(x, width)
ELSE
e := 0;
n := 0;
IF width > 23 THEN
n := width - 23;
width := 23
ELSIF width < 9 THEN
width := 9
END;
width := width - 5;
IF x < 0.0 THEN
x := -x;
minus := TRUE
ELSE
minus := FALSE
END;
WHILE x >= 10.0 DO
x := x / 10.0;
INC(e)
END;
WHILE (x < 1.0) & (x # 0.0) DO
x := x * 10.0;
DEC(e)
END;
IF x > 9.0 + d THEN
x := 1.0;
INC(e)
END;
FOR i := 1 TO n DO
Char(" ")
END;
IF minus THEN
x := -x
END;
Realp := Real;
_FixReal(x, width, width - 3);
Char("E");
IF e >= 0 THEN
Char("+")
ELSE
Char("-");
e := ABS(e)
END;
IF e < 100 THEN
Char("0")
END;
IF e < 10 THEN
Char("0")
END;
Int(e, 0)
END
END Real;
PROCEDURE FixReal*(x: REAL; width, p: INTEGER);
BEGIN
Realp := Real;
_FixReal(x, width, p)
END FixReal;
PROCEDURE Open*;
END Open;
END Out.