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Diffstat (limited to 'lang/basic/1.8.7/src/BASIC.Runtime')
| -rw-r--r-- | lang/basic/1.8.7/src/BASIC.Runtime | 1571 |
1 files changed, 1571 insertions, 0 deletions
diff --git a/lang/basic/1.8.7/src/BASIC.Runtime b/lang/basic/1.8.7/src/BASIC.Runtime new file mode 100644 index 0000000..854002a --- /dev/null +++ b/lang/basic/1.8.7/src/BASIC.Runtime @@ -0,0 +1,1571 @@ +(***************************************************************************) +(* *) +(* Erste von drei Dateien des EUMEL-BASIC-Systems *) +(* *) +(* Autor: Heiko Indenbirken *) +(* Überarbeitet von: Rudolf Ruland und Michael Overdick *) +(* *) +(* Stand: 27.10.1987 *) +(* *) +(***************************************************************************) + +PACKET basic std DEFINES EQU, UEQ, (* Autor: Heiko Indenbirken *) + LES, LEQ, (* Stand: 23.10.1987/rr/mo *) + GRE, GEQ, + EQV, IMP, + ^, swap, + val, asc, cdbl, chr, + cint, cvi, cvd, fre, + hex, inchars, + instr, ent, left, + mid, mki, mkd, + oct, right, + rnd, init rnd, + space, string, + l set, r set, + int not, real not, + /, DIV, real mod, + time, timer, + arctan, cos, sin, tan, + exp, ln, floor, + sqrt: + + +INT CONST true := -1, + false := 0; + +LET real overflow = 6; + + +(*BASIC-Integervergleiche *) +INT OP EQU (INT CONST a, b): + IF a=b + THEN true + ELSE false FI +END OP EQU; + +INT OP UEQ (INT CONST a, b): + IF a=b + THEN false + ELSE true FI +END OP UEQ; + +INT OP LES (INT CONST a, b): + IF a<b + THEN true + ELSE false FI +END OP LES; + +INT OP LEQ (INT CONST a, b): + IF a<=b + THEN true + ELSE false FI +END OP LEQ; + +INT OP GRE (INT CONST a, b): + IF a>b + THEN true + ELSE false FI +END OP GRE; + +INT OP GEQ (INT CONST a, b): + IF a>=b + THEN true + ELSE false FI +END OP GEQ; + +(*BASIC-Realvergleiche *) +INT OP EQU (REAL CONST a, b): + IF a=b + THEN true + ELSE false FI +END OP EQU; + +INT OP UEQ (REAL CONST a, b): + IF a=b + THEN false + ELSE true FI +END OP UEQ; + +INT OP LES (REAL CONST a, b): + IF a<b + THEN true + ELSE false FI +END OP LES; + +INT OP LEQ (REAL CONST a, b): + IF a<=b + THEN true + ELSE false FI +END OP LEQ; + +INT OP GRE (REAL CONST a, b): + IF a>b + THEN true + ELSE false FI +END OP GRE; + +INT OP GEQ (REAL CONST a, b): + IF a>=b + THEN true + ELSE false FI +END OP GEQ; + +(*BASIC-Tesxtvergleiche *) +INT OP EQU (TEXT CONST a, b): + IF a=b + THEN true + ELSE false FI +END OP EQU; + +INT OP UEQ (TEXT CONST a, b): + IF a=b + THEN false + ELSE true FI +END OP UEQ; + +INT OP LES (TEXT CONST a, b): + IF a<b + THEN true + ELSE false FI +END OP LES; + +INT OP LEQ (TEXT CONST a, b): + IF a<=b + THEN true + ELSE false FI +END OP LEQ; + +INT OP GRE (TEXT CONST a, b): + IF a>b + THEN true + ELSE false FI +END OP GRE; + +INT OP GEQ (TEXT CONST a, b): + IF a>=b + THEN true + ELSE false FI +END OP GEQ; + + +(*BASIC INTEGER / BOOL Operatoren *) +REAL PROC real not (REAL CONST a): (* mo *) + real (int (a) XOR -1) +END PROC real not; + +INT PROC int not (INT CONST a): (* mo *) + a XOR -1 +END PROC int not; + +INT OP EQV (INT CONST l, r): + int not (l XOR r) +END OP EQV; + +INT OP IMP (INT CONST l, r): + (l EQV r) OR r +END OP IMP; + +LET smallest significant = 5.0e-12; +REAL OP ^ (REAL CONST x, y): (* F22/rr *) + IF x > 0.0 + THEN x ** y + ELIF x = 0.0 + THEN IF y > 0.0 + THEN 0.0 + ELIF y = 0.0 + THEN 1.0 + ELSE errorstop (real overflow, ""); + max real + FI + ELSE REAL VAR floor y := floor (y + round value); + IF (abs (y - floor y) > smallest significant) + COR (floor y = 0.0 AND y <> 0.0) + THEN errorstop (1005, "bei " + text (x) + + " ^ " + text (y, 19) + + " : neg. Basis, gebr. Exponent"); + 0.0 + ELIF (floor y MOD 2.0) = 0.0 + THEN (-x) ** floor y + ELSE - ( (-x) ** floor y ) + FI + FI . + + round value : IF y >= 0.0 THEN 0.5 ELSE -0.5 FI . + +END OP ^; + +REAL OP ^ (INT CONST x, y): + real (x) ** y +END OP ^; + +REAL OP / (INT CONST l, r): (* mo *) + real (l) / real (r) +END OP /; + +INT OP DIV (REAL CONST l, r): (* mo *) + cint (l) DIV cint (r) +END OP DIV; + +REAL PROC real mod (REAL CONST l, r): (* mo *) + round (l, 0) MOD round (r, 0) +END PROC real mod; + +(* Basic Arithmetik *) +REAL VAR r swap; +PROC swap (REAL VAR left, right): + r swap := left; + left := right; + right := r swap +END PROC swap; + +INT VAR i swap; +PROC swap (INT VAR left, right): + i swap := left; + left := right; + right := i swap +END PROC swap; + +TEXT VAR t swap; +PROC swap (TEXT VAR left, right): + t swap := left; + left := right; + right := t swap +END PROC swap; + +(*Internkonvertierungen *) +INT PROC cvi (TEXT CONST v): + v ISUB 1 +END PROC cvi; + +REAL PROC cvd (TEXT CONST v): + v RSUB 1 +END PROC cvd; + +TEXT VAR i text :: 2*""0"", r text :: 8*""0""; +TEXT PROC mki (REAL CONST x): + mki (cint (x)) +END PROC mki; + +TEXT PROC mki (INT CONST i): + replace (i text, 1, i); + i text +END PROC mki; + +TEXT PROC mkd (INT CONST i): + mkd (real (i)) +END PROC mkd; + +TEXT PROC mkd (REAL CONST r): + replace (r text, 1, r); + r text +END PROC mkd; + +(*Textoperationen *) +PROC l set (TEXT VAR left, TEXT CONST right): + replace (left, 1, right) +END PROC l set; + +PROC r set (TEXT VAR left, TEXT CONST right): + replace (left, length (left)-length (right)+1, right) +END PROC r set; + +TEXT PROC left (TEXT CONST string, REAL CONST no): + left (string, cint (no)) +END PROC left; + +TEXT PROC left (TEXT CONST string, INT CONST no): + subtext (string, 1, no) +END PROC left; + +TEXT PROC right (TEXT CONST string, REAL CONST no): + right (string, cint (no)) +END PROC right; + +TEXT PROC right (TEXT CONST string, INT CONST no): + subtext (string, length (string)-no+1) +END PROC right; + +TEXT PROC mid (TEXT CONST source, REAL CONST from): + mid (source, cint (from)) +END PROC mid; + +TEXT PROC mid (TEXT CONST source, INT CONST from): + subtext (source, from) +END PROC mid; + +TEXT PROC mid (TEXT CONST source, REAL CONST from, length): + mid (source, cint (from), cint (length)) +END PROC mid; + +TEXT PROC mid (TEXT CONST source, INT CONST from, length): + subtext (source, from, from+length-1) +END PROC mid; + +TEXT PROC string (REAL CONST x, y): + string (cint (x), cint (y)) +END PROC string; + +TEXT PROC string (INT CONST x, REAL CONST y): + string (x, cint (y)) +END PROC string; + +TEXT PROC string (REAL CONST x, INT CONST y): + string (cint (x), y) +END PROC string; + +TEXT PROC string (INT CONST i, j): + i * code (j) +END PROC string; + +TEXT PROC string (REAL CONST i, TEXT CONST x): + string (cint (i), x) +END PROC string; + +TEXT PROC string (INT CONST i, TEXT CONST x): + i * (x SUB 1) +END PROC string; + +(*Konvertierungen *) + +REAL PROC val (TEXT CONST text) : (* F18/rr *) + + TEXT VAR buffer := text; + change (buffer, "d", "e"); + change (buffer, "D", "e"); + change (buffer, "E", "e"); + real (buffer) + +END PROC val; + +REAL PROC asc (TEXT CONST text): + real (code (text SUB 1)) +END PROC asc; + +TEXT PROC chr (INT CONST n): + code (n) +END PROC chr; + +TEXT PROC chr (REAL CONST n): + code (cint (n)) +END PROC chr; + +TEXT PROC hex (REAL CONST x): + hex (cint (x)) +END PROC hex; + +TEXT PROC hex (INT CONST x): + TEXT VAR value :: "12"; + replace (value, 1, x); + high byte + low byte . + +low byte: + hexdigit (code (value SUB 1) DIV 16) + hexdigit (code (value SUB 1) MOD 16) . + +high byte: + IF (value SUB 2) = ""0"" + THEN "" + ELSE hexdigit (code (value SUB 2) DIV 16) + + hexdigit (code (value SUB 2) MOD 16) + FI . + +END PROC hex; + +TEXT PROC oct (REAL CONST x): + oct (cint (x)) +END PROC oct; + +TEXT PROC oct (INT CONST x): + INT VAR number :: x AND maxint; + generate oct number; + IF x < 0 + THEN "1" + oct number + ELSE subtext (oct number, pos (oct number, "1", "7", 1)) + FI. + +generate oct number: + TEXT VAR oct number :: ""; + INT VAR digit; + FOR digit FROM 1 UPTO 5 REP + oct number := hexdigit (number MOD 8) + oct number; + number := number DIV 8 + PER. + +END PROC oct; + +TEXT PROC hexdigit (INT CONST digit): + IF 0 <= digit AND digit <= 9 + THEN code (digit + 48) + ELIF 10 <= digit AND digit <= 15 + THEN code (digit + 55) + ELSE errorstop (1051, "Hexziffer außerhalb des gültigen Bereichs"); "" FI +END PROC hexdigit; + +TEXT PROC inchars (REAL CONST n): + inchars (cint (n)) +END PROC inchars; + +TEXT PROC inchars (INT CONST n): + TEXT VAR buffer :: "", char; + INT VAR i; + FOR i FROM 1 UPTO n + REP inchar (char); + buffer CAT char + PER; + buffer + +END PROC inchars; + +(*Mathematische Prozeduren *) +REAL PROC ent (INT CONST r): + real (r) +END PROC ent; + +REAL PROC ent (REAL CONST r): + IF r >= 0.0 OR frac (r) = 0.0 + THEN floor (r) + ELSE floor (r-1.0) FI +END PROC ent; + +REAL PROC cdbl (INT CONST r): + real (r) +END PROC cdbl; + +REAL PROC cdbl (REAL CONST r): + r +END PROC cdbl; + +INT PROC cint (INT CONST r): + r +END PROC cint; + +INT PROC cint (REAL CONST r): + IF r >= 0.0 + THEN int (r+0.5) + ELSE int (r-0.5) FI +END PROC cint; + +REAL VAR last rnd :: rnd (1.0); +REAL PROC rnd (INT CONST x): + rnd (real (x)) +END PROC rnd; + +REAL PROC rnd (REAL CONST x): + IF x > 0.0 + THEN last rnd := random; + last rnd + ELIF x = 0.0 + THEN last rnd + ELSE init rnd (x); + last rnd := random; + last rnd + FI + +END PROC rnd; + +REAL PROC rnd: + rnd (1.0) +END PROC rnd; + +PROC init rnd (REAL CONST init value) : + + REAL VAR init := init value; + IF init <= -1.0 OR 1.0 <= init + THEN set exp (- decimal exponent (init) - 1, init) FI; + initialize random (init) + +END PROC init rnd; + + +REAL PROC fre (TEXT CONST dummy): + INT VAR f, u; + collect heap garbage; + storage (f, u); + + real (f - u) * 1024.0 +END PROC fre; + +REAL PROC fre (REAL CONST dummy): + fre ("") +END PROC fre; + +REAL PROC fre (INT CONST dummy): + fre ("") +END PROC fre; + +(*Inputroutinenen *) +INT PROC instr (TEXT CONST source, pattern): + pos (source, pattern) +END PROC instr; + +INT PROC instr (REAL CONST from, TEXT CONST source, pattern): + instr (cint (from), source, pattern) +END PROC instr; + +INT PROC instr (INT CONST from, TEXT CONST source, pattern): + pos (source, pattern, from) +END PROC instr; + +TEXT PROC space (REAL CONST len): + space (cint (len)) +END PROC space; + +TEXT PROC space (INT CONST len): + len * " " +END PROC space; + +TEXT PROC time: (* mo *) + subtext (time (clock (1) MOD day), 1, 8) (* hh:mm:ss *) +END PROC time; + +REAL PROC timer: + clock (0) +END PROC timer; + +REAL PROC arctan (INT CONST x): + arctan (real (x)) +END PROC arctan; + +REAL PROC cos (INT CONST x): + cos (real (x)) +END PROC cos; + +REAL PROC sin (INT CONST x): + sin (real (x)) +END PROC sin; + +REAL PROC tan (INT CONST x): + tan (real (x)) +END PROC tan; + +REAL PROC exp (INT CONST x): + exp (real (x)) +END PROC exp; + +REAL PROC ln (INT CONST x): + ln (real (x)) +END PROC ln; + +REAL PROC floor (INT CONST x): + real (x) +END PROC floor; + +REAL PROC sqrt (INT CONST x): + sqrt (real (x)) +END PROC sqrt; + +END PACKET basic std; + +PACKET basic using DEFINES using, (* Autor: Heiko Indenbirken *) + clear using, (* Stand: 05.08.1987/rr/mo *) + basic text: + + +LET exclamation point = "!", + backslash = "\", + comercial and = "&", + numbersign = "#", + plus = "+", + minus = "-", + asterisk dollar = "**$", + asterisk = "**", + dollarsign = "$$", + comma = ",", + point = ".", + caret = "^^^^", + underscore = "_", + blank = " ", + nil = "", + + number format chars = "#+-*$.^", + format chars = "!\&#+-$*."; + +TEXT VAR result, using format :: "", pre format :: ""; +INT VAR using pos :: 0; +BOOL VAR image used :: FALSE; + +PROC using (TEXT CONST format): + using format := format; + using pos := 0; + result := ""; + image used := TRUE + +END PROC using; + +PROC clear using: + using format := ""; + image used := FALSE +END PROC clear using; + +TEXT PROC next format: + pre format := ""; + IF using pos = 0 + THEN "" + ELSE search rest of format FI . + +search rest of format: + WHILE using pos <= length (using format) + REP IF at underscore + THEN using pos INCR 1; + pre format CAT akt char + ELIF at format char + THEN LEAVE next format WITH pre format + ELSE pre format CAT akt char FI; + using pos INCR 1 + PER; + using pos := 0; + pre format . + +at underscore: + akt char = underscore . + +at format char: + pos (format chars, akt char) > 0 CAND + evtl double asterisk CAND + evtl point with numbersign . + +evtl double asterisk: + akt char <> asterisk COR next char = asterisk . + +evtl point with numbersign: + akt char <> point COR next char = numbersign . + +akt char: using format SUB using pos . +next char: using format SUB using pos+1 . +END PROC next format; + +PROC init (TEXT VAR l result): + IF using pos = 0 + THEN using pos := 1; + l result := next format; + IF using pos = 0 + THEN errorstop (1005, "USING: kein Format gefunden") FI + ELSE l result := "" FI + +END PROC init; + +TEXT PROC basic text (TEXT CONST string): + IF image used + THEN using text + ELSE string FI . + +using text: + init (result); + result CAT format string; + using pos INCR 1; + result CAT next format; + result . + +format string: + IF akt char = exclamation point + THEN string SUB 1 + ELIF akt char = backslash + THEN given length string + ELIF akt char = comercial and + THEN string + ELSE errorstop (1005, "USING-Format fehlerhaft: " + using format); "" FI . + +given length string: + INT VAR len :: 2; + FOR using pos FROM using pos+1 UPTO length (using format) + REP IF akt char = "\" + THEN LEAVE given length string WITH text (string, len) FI; + len INCR 1 + UNTIL akt char <> " "PER; + errorstop (1005, "USING-Format fehlerhaft: " + using format); + "" . + +akt char: using format SUB using pos +END PROC basic text; + +TEXT PROC basic text (INT CONST number): + IF image used + THEN basic text (real (number)) + ELSE sign + text (number) FI . + +sign: + IF number >= 0 + THEN " " + ELSE "" FI . + +END PROC basic text; + +TEXT PROC basic text (REAL CONST number): + IF image used + THEN using text + ELSE normal text FI . + +normal text: +(* Bei Real Zahlen werden maximal 7 signifikante Stellen ausgegeben, *) +(* führende und nachfolgende Nullen werden unterdrückt, *) +(* der Dezimalpunkt wird im Normalformat unterdrückt *) + calculate sign; + REAL VAR mantissa := round (abs (number), 6-decimal exponent (number)); + INT CONST exp :: decimal exponent (mantissa); + + IF mantissa = 0.0 + THEN result := " 0" + ELIF exp > 6 OR exp < -7 OR (exp < 0 AND more than 7 signifikant digits) + THEN scientific notation + ELIF exp < 0 + THEN short negative notation + ELSE short positive notation FI; + result . + +more than 7 signifikant digits: + REAL VAR signifikant := mantissa; + set exp (7+exp, signifikant); + frac (signifikant) <> 0.0 . + +calculate sign: + IF number >= 0.0 + THEN result := " " + ELSE result := "-" FI . + +scientific notation: + set exp (0, mantissa); + result CAT non zero (text (mantissa, 8, 6)); + + IF exp < 0 + THEN result CAT "E-" + ELSE result CAT "E+" FI; + + IF abs (exp) > 9 + THEN result CAT text (abs (exp)) + ELSE result CAT "0"; + result CAT text (abs (exp)) + FI . + +short positive notation: + result CAT non zero (text (mantissa, 8, 6-exp)); + IF (result SUB LENGTH result) = "." + THEN delete char (result, LENGTH result) FI . + +short negative notation: + result CAT non zero (subtext (text (abs (mantissa), 9, 7), 2)).(* F13/rr *) + +using text: + init (result); + result CAT format number (subformat, number); + result CAT next format; + result . + +subformat: + INT VAR from :: using pos, to :: last format char; + subtext (using format, from, to) . + +last format char: + FOR using pos FROM using pos+1 UPTO length (using format) + REP IF non format char + THEN LEAVE last format char WITH using pos-1 FI + PER; + using pos := 0; + length (using format) . + +non format char: + IF (using format SUB using pos) = comma + THEN (using format SUB (using pos+1)) <> point + ELSE pos (numberformat chars, using format SUB using pos) = 0 FI . + +END PROC basic text; + +TEXT PROC non zero (TEXT CONST text): + INT VAR i; + FOR i FROM length (text) DOWNTO 2 + REP UNTIL (text SUB i) <> "0" PER; + subtext (text, 1, i) +END PROC non zero; + +TEXT PROC format number (TEXT CONST format, REAL CONST number): + IF no digit char + THEN errorstop (1005, "USING-Format fehlerhaft: " + using format); "" + ELIF exponent found + THEN exponent format + ELSE normal format FI . + +no digit char: + pos (format, numbersign) = 0 AND + pos (format, asterisk) = 0 AND + pos (format, dollarsign) = 0 . + +exponent found: + INT CONST exponent pos := pos (format, caret); + exponent pos > 0 . + +exponent format: + IF leading plus + THEN plus or minus + exponent field (subtext (format, 2), number, exponent pos-1) + ELIF trailing plus + THEN exponent field (format, number, exponent pos) + plus or minus + ELIF trailing minus + THEN exponent field (format, number, exponent pos) + nil or minus + ELSE blank or minus + exponent field (subtext (format, 2), number, exponent pos-1) FI . + +normal format: + IF leading numbersign + THEN number field (format, number, "", " ") + ELIF leading point + THEN number field (format, number, "", " ") + ELIF leading plus + THEN number field (format, abs (number), plus or minus, " ") + ELIF leading asterisk dollar + THEN number field (format, number, "$", "*") + ELIF leading asterisk + THEN number field (format, number, "", "*") + ELIF leading dollarsign + THEN number field (format, number, "$", " ") + ELSE errorstop (1005, "USING-Format fehlerhaft: " + using format); "" FI . + +leading numbersign: (format SUB 1) = numbersign . +leading point: (format SUB 1) = point . +leading plus: (format SUB 1) = plus . +leading asterisk dollar: subtext (format, 1, 3) = asterisk dollar . +leading asterisk: subtext (format, 1, 2) = asterisk . +leading dollarsign: subtext (format, 1, 2) = dollarsign . + +trailing minus: (format SUB LENGTH format) = minus . +trailing plus: (format SUB LENGTH format) = plus . + +plus or minus: IF number < 0.0 THEN minus ELSE plus FI . +nil or minus: IF number < 0.0 THEN minus ELSE nil FI . +blank or minus: IF number < 0.0 THEN minus ELSE blank FI . + +END PROC format number; + +TEXT PROC exponent field (TEXT CONST format, REAL CONST value, INT CONST exponent pos): + REAL VAR number := abs (value); + INT CONST point pos := pos (format, point); + calc leading and trailing; + INT CONST new exponent :: decimal exponent (value) - leading + 1; + IF abs (new exponent) >= 100 + THEN "%" + mantissa + "E" + null text (new exponent, 4) + ELSE mantissa + exponent + FI. + +calc leading and trailing: + INT VAR leading, trailing; + IF point pos = 0 + THEN leading := exponent pos-1; + trailing := 0 + ELSE leading := point pos-1; + trailing := exponent pos-point pos-1 + FI . + +mantissa: + set exp (leading - 1, number); + IF point pos = 0 + THEN subtext (text (number, leading+1, 0), 1, leading) + ELSE subtext (text (number, leading+trailing+2, trailing), 2) FI . + +exponent: + "E" + null text (new exponent, 3) . + +END PROC exponent field; + +TEXT PROC number field (TEXT CONST format, REAL CONST value, + TEXT CONST pretext, lead char): + INT CONST point pos :: pos (format, point); + calc fraction; + calc digits; + calc commata if necessary; + fill with lead chars and sign . + +calc fraction: + INT VAR fraction :: 0, i; + FOR i FROM point pos+1 UPTO length (format) + WHILE (format SUB i) = numbersign + REP fraction INCR 1 PER . + +calc digits: + TEXT VAR valuetext; + IF point pos = 0 + THEN valuetext := digits (abs (value), 0, TRUE); + delete char (valuetext, length (valuetext)) + ELSE valuetext := digits (abs (value), fraction, point pos <> 1) FI . + +calc commata if necessary: + IF comma before point + THEN insert commata FI . + +comma before point: + point pos > 0 CAND (format SUB point pos-1) = comma . + +insert commata: + i := pos (valuetext, point)-3; + WHILE i > 1 CAND (valuetext SUB i) <> " " + REP insert char (valuetext, ",", i); + i DECR 3 + PER . + +fill with lead chars and sign: + IF trailing minus + THEN fillby (pretext + valuetext, length (format)-1, lead char) + nil or minus + ELIF trailing plus + THEN fillby (pretext + valuetext, length (format)-1, lead char) + plus or minus + ELIF value < 0.0 + THEN fillby (pretext + minus + valuetext, length (format), lead char) + ELSE fillby (pretext + valuetext, length (format), lead char) FI . + + +plus or minus: IF value < 0.0 THEN minus ELSE plus FI . +nil or minus: IF value < 0.0 THEN minus ELSE nil FI . +trailing minus: (format SUB LENGTH format) = minus . +trailing plus: (format SUB LENGTH format) = plus . +END PROC numberfield; + +TEXT PROC null text (INT CONST n, digits): + TEXT VAR l result := text (abs (n), digits); + IF n < 0 + THEN replace (l result, 1, "-") + ELSE replace (l result, 1, "+") FI; + change all (l result, " ", "0"); + l result . +END PROC null text; + +TEXT PROC fillby (TEXT CONST source, INT CONST format, TEXT CONST with): + IF differenz >= 0 + THEN differenz * with + source + ELSE "%" + source FI . + +differenz: format - length (source) . +END PROC fillby; + +TEXT PROC digits (REAL CONST value, INT CONST frac, BOOL CONST null): + IF decimal exponent (value) < 0 + THEN TEXT VAR l result := text (value, frac+2, frac); + + IF null AND first char <> "0" + THEN replace (l result, 1, "0"); + l result + ELIF (NOT null AND first char = "0") OR first char = " " + THEN subtext (l result, 2) + ELSE l result FI + ELSE text (value, decimal exponent (value)+frac+2, frac) FI . + +first char: + (l result SUB 1) . + +END PROC digits; + +TEXT PROC right (TEXT CONST msg, INT CONST len): + IF length (msg) >= len + THEN subtext (msg, 1, len) + ELSE (len - length (msg)) * " " + msg FI + +END PROC right; + +END PACKET basic using; + +PACKET basic output (* Autor: R. Ruland *) + (* Stand: 28.08.1987/rr/mo *) + DEFINES basic page, + width, + init output, + basic out, + basic write, + tab, + next zone, + next line, + next page, + cursor x pos, + pos, + csrlin, + l pos, + switch to printout file, + switch back to old sysout state: + +LET zone width = 16; (* sd.ddddddEsdddb (s = sign, d = digit, b = blank) *) +LET printfile name = "BASIC LPRINT OUTPUT"; + +INT VAR screen width, x cursor, y cursor, line no; +BOOL VAR paging := FALSE, first time, + in lprint; (* mo *) +TEXT VAR buffer, output line, last sysout file, old sysout, char; + +PROC basic page (BOOL CONST status): + + paging := status + +END PROC basic page; + +BOOL PROC basic page: paging END PROC basic page; + + +PROC width (INT CONST max): + + IF max < 0 + THEN errorstop (1005, "WIDTH: negatives Angabe: " + text (max)) + ELIF max = 0 + THEN screen width := 1 + ELSE screen width := max + FI; + last sysout file := ""; + +END PROC width; + +INT PROC width : screen width END PROC width; + + +PROC init output: + + clear using; + width (max (1, x size)); + line no := 1; + output line := ""; + first time := TRUE; + in lprint := FALSE + +END PROC init output; + + +PROC basic out (INT CONST i): bas out (basic text (i) + " ") END PROC basic out; + +PROC basic out (REAL CONST r): bas out (basic text (r) + " ") END PROC basic out; + +PROC basic out (TEXT CONST t): bas out (basic text (t)) END PROC basic out; + +PROC basic write (INT CONST i): bas out (basic text (i)) END PROC basic write; + +PROC basic write (REAL CONST r): bas out (basic text (r)) END PROC basic write; + +PROC basic write (TEXT CONST t): bas out (basic text ("""" + t + """")) END PROC basic write; + + +PROC bas out (TEXT CONST msg): + + get cursor; + IF length (msg) > free + THEN IF first time + THEN first time := FALSE; + next line; + bas out (msg); + ELSE buffer := subtext (msg, 1, free); + IF sysout = "" + THEN out (buffer) + ELSE sysout write (buffer) + FI; + next line; + buffer := subtext (msg, free + 1); + bas out (buffer); + FI; + ELSE first time := TRUE; + IF sysout = "" + THEN out (msg) + ELSE sysout write (msg) + FI; + FI; + + . free : screen width - x cursor + 1 + +END PROC bas out; + + +PROC tab (INT CONST n): + + get cursor; + IF n <= 0 + THEN tab position out of range + ELIF n > screen width + THEN tab (n MOD screen width); + ELIF x cursor > n + THEN next line; + tab (n); + ELIF sysout = "" + THEN cursor (n, y cursor); + ELSE buffer := (n - x cursor) * " "; + sysout write (buffer) + FI; + + . tab position out of range : + IF x cursor <> 1 THEN next line FI; + write ("WARNUNG : TAB-Position <= 0"); + next line; + +END PROC tab; + + +PROC next zone: + + get cursor; + IF x cursor > screen width - zone width + THEN next line; + ELIF sysout = "" + THEN free TIMESOUT " "; + ELSE buffer := free * " "; + sysout write (buffer) + FI; + + . free : ((x cursor - 1) DIV zone width + 1) * zone width - x cursor + 1 + +END PROC next zone; + + +PROC next line : + + IF sysout = "" + THEN next line on screen + ELSE line; + write (""); (* generates new record *) + output line := ""; + FI; + + . next line on screen: + line no INCR 1; + IF paging CAND line no > y size + THEN IF in last line + THEN warte; + ELSE out (""13""10""); + line no := y cursor + 1; + FI; + ELIF NOT paging + THEN char := incharety; + IF char <> "" + THEN IF char = "+" + THEN paging := TRUE + ELSE type (char) + FI + FI; + out (""13""10"") + ELSE out (""13""10"") + FI + + . in last line : + get cursor; + y cursor = y size + + . warte : + cursor (x size - 2, y size); + out (">>"); + inchar (char); + IF char = ""13"" + THEN next page + ELIF char = ""10"" + THEN out (""8""8" "13""10"") + ELIF char = ""27"" + THEN clear editor buffer; + errorstop (1, "") + ELIF char = "-" + THEN out (""8""8" "13""10""); + line no := 1; + paging := FALSE; + ELSE out (""8""8" "13""10""); + line no := 1; + FI; + + . clear editor buffer: + REP UNTIL get charety = "" PER; + +END PROC next line; + + +PROC next page: + + IF sysout = "" + THEN out (""1""4"") + ELSE line + FI; + clear using; + line no := 1; + output line := ""; + +END PROC next page; + + +INT PROC pos (REAL CONST dummy): (* mo *) + + cursor x pos + +END PROC pos; + + +INT PROC pos (INT CONST dummy): (* mo *) + + cursor x pos + +END PROC pos; + + +INT PROC cursor x pos : + + get cursor; + x cursor + +END PROC cursor x pos; + + +INT PROC csrlin: (* mo *) + + get cursor; + y cursor + +END PROC csrlin; + + +PROC get cursor : + + IF sysout = "" + THEN get cursor (x cursor, y cursor); + ELSE x cursor := LENGTH output line + 1; + FI; + +END PROC get cursor; + + +INT PROC l pos (REAL CONST dummy): (* mo *) + + l pos (0) + +END PROC l pos; + + +INT PROC l pos (INT CONST dummy): (* mo *) + + INT VAR lprint position :: 1; + IF exists (printfile name) + THEN disable stop; + FILE VAR printfile :: sequential file (modify, printfile name); + IF lines (printfile) > 0 + THEN to line (printfile, lines (printfile)); + lprint position := len (printfile) + 1 + FI; + output (printfile) + FI; + lprint position + +END PROC l pos; + + +PROC switch to printout file: (* mo *) + + in lprint := TRUE; + old sysout := sysout; + careful sysout (printfile name); + +END PROC switch to printout file; + + +PROC switch back to old sysout state: (* mo *) + + IF in lprint + THEN careful sysout (old sysout); + in lprint := FALSE + FI + +END PROC switch back to old sysout state; + + +PROC sysout write (TEXT CONST string): + check sysout; + write (string); + output line CAT string. + +check sysout: + IF sysout <> last sysout file + THEN careful sysout (sysout) + FI. + +END PROC sysout write; + + +PROC careful sysout (TEXT CONST new sysout): (* mo *) + +IF new sysout <> "" + THEN disable stop; + FILE VAR outfile :: sequential file (modify, new sysout); + max line length (outfile, screen width); + last sysout file := sysout; + IF lines (outfile) > 0 + THEN to line (outfile, lines (outfile)); + read record (outfile, output line); + delete record (outfile) + ELSE output line := "" + FI; + sysout (new sysout); + write (output line); + ELSE sysout ("") +FI + +END PROC careful sysout; + +END PACKET basic output; + + +PACKET basic input (* Autor: R. Ruland *) + (* Stand: 27.10.1987/rr/mo *) + + DEFINES init input, + read input, + check input, + assign input, + assign input line, + input ok, + input eof: + + +LET comma = ",", + quote = """", + + wrong type = 1, + insufficient data = 2, + too much data = 3, + overflow = 4, + + int overflow = 4, + real overflow = 6; + +INT VAR input line pos, input error no; +BOOL VAR on terminal; +TEXT VAR input line :: "", previous input line := "", input value; + +. first quote found : (input value SUB 1) = quote +.; + +PROC init input : + + input error no := 0; + input line pos := 0; + input line := ""; + previous input line := ""; + +END PROC init input; + + +PROC read input (BOOL CONST cr lf, TEXT CONST msg, BOOL CONST question mark): + + on terminal := sysout <> "" AND sysin = ""; + check input error; + out string (msg); + IF question mark THEN out string ("? ") FI; + IF sysin <> "" + THEN getline (input line); + ELSE editget input line; + FI; + out string (input line); + IF crlf THEN out line FI; + input line pos := 0; + input error no := 0; + + . check input error : + IF input error no = 0 + THEN input line := ""; + ELSE IF sysin = "" + THEN BOOL CONST old basic page := basic page; + basic page (FALSE); + IF cursor x pos <> 1 THEN next line FI; + basic out ("?Eingabe wiederholen ! (" + error text + ")"); + next line; + basic page (old basic page); + ELSE errorstop (1080,"INPUT-Fehler (" + error text + + ") : >" + input line + "<"); + FI; + FI; + + . error text : + SELECT input error no OF + CASE wrong type : "falscher Typ" + CASE insufficient data : "zu wenig Daten" + CASE too much data : "zu viele Daten" + CASE overflow : "Überlauf" + OTHERWISE : "" + END SELECT + + . editget input line : + TEXT VAR exit char; + INT VAR x, y; + get cursor (x, y); + REP IF width - x < 1 + THEN out (""13""10""); + get cursor (x, y) + FI; + editget (input line, max text length, width - x, "", "k", exit char); + cursor (x, y); + IF exit char = ""27"k" + THEN input line := previous input line; + ELSE previous input line := input line; + LEAVE editget input line; + FI; + PER; + +END PROC read input; + + +PROC out string (TEXT CONST string) : + + basic out (string); + IF on terminal THEN out (string) FI; + +END PROC out string; + + +PROC out line : + + next line; + IF on terminal THEN out (""13""10"") FI; + +END PROC out line; + + +BOOL PROC check input (INT CONST type) : + + get next input value; + input value := compress (input value); + set conversion (TRUE); + SELECT type OF + CASE 1 : check int input + CASE 2 : check real input + CASE 3 : check text input + END SELECT; + IF NOT last conversion ok THEN input error no := wrong type FI; + input error no = 0 + + . check int input : + IF input value <> "" + THEN disable stop; + INT VAR help int value; + help int value := int (input value); + IF is error CAND error code = int overflow + THEN clear error; + input error no := overflow; + FI; + enable stop; + FI; + + . check real input : + IF input value <> "" + THEN disable stop; + REAL VAR help real value; + help real value := val (input value); + IF is error CAND (error code = real overflow + OR error code = int overflow) (* <-- Aufgrund eines Fehlers in 'real' *) + THEN clear error; + input error no := overflow; + FI; + enable stop; + FI; + + . check text input : + (* IF input value = "" THEN input error no := wrong type FI; *) + IF NOT is quoted string CAND quote found + THEN input error no := wrong type + FI; + + . is quoted string : + first quote found CAND last quote found + + . last quote found : + (input value SUB LENGTH input value) = quote + + . quote found : + pos (input value, quote) > 0 + +END PROC check input; + + +PROC assign input (INT VAR int value) : + + get next input value; + int value := int (input value); + +END PROC assign input; + +PROC assign input (REAL VAR real value) : + + get next input value; + real value := val (input value); + +END PROC assign input; + +PROC assign input (TEXT VAR string value) : + + get next input value; + input value := compress (input value); + IF first quote found + THEN string value := subtext (input value, 2, LENGTH input value -1) + ELSE string value := input value + FI; + +END PROC assign input; + +PROC assign input line (TEXT VAR string line) : + + string line := input line; + +END PROC assign input line; + + +PROC get next input value : (* F27/rr *) + + IF input line pos > LENGTH input line + THEN input value := ""; + input error no := insufficient data; + ELSE IF next non blank char = quote + THEN get quoted string + ELSE get unquoted string + FI; + FI; + + . next non blank char : + INT CONST next non blank char pos := pos (input line, ""33"", ""255"", input line pos + 1); + input line SUB next non blank char pos + + . get quoted string : + INT CONST quote pos := pos (input line, quote, next non blank char pos + 1); + IF quote pos = 0 + THEN input value := subtext (input line, next non blank char pos); + input line pos := LENGTH input line + 1; + input error no := wrong type; + ELSE input value := subtext (input line, next non blank char pos, quote pos); + input line pos := pos (input line, ""33"", ""255"", quote pos + 1); + IF input line pos = 0 + THEN input line pos := LENGTH input line + 1; + ELIF (input line SUB input line pos) <> comma + THEN input error no := wrong type; + input line pos DECR 1; + FI; + FI; + + . get unquoted string : + INT VAR comma pos := pos (input line, comma, input line pos + 1); + IF comma pos = 0 + THEN input value := subtext (input line, input line pos + 1); + input line pos := LENGTH input line + 1; + ELSE input value := subtext (input line, input line pos + 1, comma pos - 1); + input line pos := comma pos; + FI; + +END PROC get next input value; + + +BOOL PROC input ok: + + IF input line pos <= LENGTH input line + THEN input error no := too much data FI; + input line pos := 0; + input error no = 0 + +END PROC input ok; + +BOOL PROC input eof: input line = "" END PROC input eof; + + +END PACKET basic input; + +PACKET basic std using io (* Autor: R. Ruland *) + (* Stand: 26.10.87/rr/mo *) + + DEFINES init rnd: + + +PROC init rnd: + + REAL VAR init; + REP read input (TRUE, "Startwert des Zufallszahlengenerators ? ", FALSE); + UNTIL check input (2) CAND input ok PER; (* F24/rr *) + assign input (init); + init rnd (init); + +END PROC init rnd; + + +END PACKET basic std using io; + |