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decuslib20-04
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decus/20-0135/vided1.sim
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00010 OPTIONS(/l/e); COMMENT DISPLAY EDITOR.
00020 See VISTA.MAN for explanations on the routines called by this
00030 program, taken from the class mvista;
00040 EXTERNAL TEXT PROCEDURE conc, front, storbokstav, upcase,
00050 compress, rest, inline, frontstrip, scanto, from, upto;
00060 EXTERNAL CHARACTER PROCEDURE findtrigger, fetchar, getch;
00070 EXTERNAL INTEGER PROCEDURE search, scanint, scan, checkint;
00080 EXTERNAL REF (infile) PROCEDURE findinfile;
00090 EXTERNAL REF (outfile) PROCEDURE findoutfile;
00100 EXTERNAL INTEGER PROCEDURE trmop, gettab;
00110 EXTERNAL BOOLEAN PROCEDURE puttext, numbered, dotypeout;
00120 EXTERNAL PROCEDURE depchar, outstring, forceout, echo;
00130 EXTERNAL PROCEDURE outchr, abort, exit;
00140 EXTERNAL CLASS mvista, qregister=vided0;
00150
00160 mvista CLASS vided1(pageheader,increment,editout,editin,
00170 command, belowcommand, arg, numbered_infile,pageheight,
00180 left_margin, right_margin, qregisters);
00190
00200 INTEGER increment; ! between new line-numbered lines;
00210 INTEGER pageheight; ! 1) before page-end-warning line, 2)
00220 plus height = number of lines kept in core;
00230 INTEGER left_margin, right_margin; ! used when justifying
00240 paragraphs;
00250 BOOLEAN numbered_infile; ! input file had line numbers;
00260 BOOLEAN pageheader; ! Put header and number on new pages;
00270 REF (infile) editin; ! Input file to be edited;
00280 REF (outfile) editout; ! Output file from editing;
00290 TEXT command; ! Text of user &command during editing;
00300 TEXT belowcommand; ! Screen text below user &command;
00310 TEXT ARRAY arg; ! User switch.ini and file creation commands;
00320 REF (qregister) qregisters; ! See description of &Q editor
00330 command;
00340 BEGIN INTEGER ARRAY screen_length[0:height-1]; ! when overwriting
00350 part of the screen with corrected text, this array keeps the old
00360 line lengthes to know how much has to be overwritten;
00370 TEXT ARRAY top_of_page[0:pageheight]; ! lines which have rolled
00380 out on top of the screen but have not yet been output;
00390 INTEGER top_size; ! Number of lines in "top_of_page";
00400 INTEGER top_fill; ! Number of lines currently in "top_of_page";
00410 INTEGER ttytab; ! Value of monitor TRMOP .TTY TAB settings,
00420 governs the handling of <HT> characters at terminal output;
00430 INTEGER pagenumber; ! Count of input page number;
00440 INTEGER debugslow; ! When this variable is nonzero, the program can
00450 be artificially slowed down to create the kind of bugs which only
00460 occur with a heavily loaded computer;
00470 INTEGER out_pagenumber; ! Count of output page number;
00480 INTEGER last_line_number; ! When creating line-numbered files,
00490 number of last line which has been output to the output file;
00500 INTEGER largest_line_number; ! Largest line number yet created;
00510 INTEGER first_text_pos;! 8 for numbered, 0 for other files;
00520 CHARACTER control_f, control_d, control_v, control_u, control_w;
00530 ! What is input when the terminal user pushes CONTROL plus
00540 one of the letters f, d, v, u or w;
00550 BOOLEAN ARRAY tab_position[0:width]; ! tabs set by user;
00560 INTEGER margin_width; ! right_margin-left_margin;
00570 INTEGER cover_length; ! cover old text at end of line;
00580 BOOLEAN first_input_line; ! true when only one line has been input
00590 from the input text file;
00600 BOOLEAN long_line_warned; ! user has been warned about too long
00610 input lines;
00620 BOOLEAN addff; ! Add <form feed> before next output line;
00630 BOOLEAN after_addff; ! Outputting second line of a page;
00640 BOOLEAN endpage; ! Last line of a page has been read from file;
00650 BOOLEAN verybadscreen; ! Terminal screen must be restored from the
00660 computer;
00670 BOOLEAN printing; ! New input lines to be printed on terminal;
00680 BOOLEAN emptyscroll; ! Scroll in blank lines at bottom of screen;
00690 TEXT editin_image_strip; ! Stripped text of last line from the input
00700 text file;
00710 TEXT other_editin_image; ! Extra image to be used sometimes;
00720 TEXT line_model; ! Extra line, often blank, for use sometimes;
00730 TEXT editout_image; ! Image of output text file;
00740 TEXT header; ! Header at top of each page;
00750 TEXT sub_header; ! Subheader = line below header;
00760 TEXT page_word; ! Contains the word "PAGE";
00770 TEXT sid_word; ! Contains the word "SID", swedish for "PAGE";
00780 TEXT sixdigits; ! Used to produce line number text segments;
00790 TEXT page_end_marker; ! Funny text warning user of end-of-page;
00800 TEXT output_line; ! Line to be output to output text file;
00810 TEXT first_scroll_line; ! Top-of-page-line to be scrolled out;
00820 COMMENT REF-variables below used to get faster execution by using
00830 the CALL procedure instead of ordinary PROCEDURE invokings;
00840 REF (one_more_line_please) p_one_more_line_please;
00850 REF (scroll) p_scroll;
00860 REF (editin_true_inimage) p_editin_true_inimage;
00870 REF (true_write) p_true_write;
00880 REF (write) p_write;
00890 REF (editin_inimage) p_editin_inimage;
00900 REF (lower_line) lower_lines;
00910 TEXT PROCEDURE make_five_digits(i);
00920 INTEGER i;
00930 BEGIN COMMENT prepars text in line-number-field of output line;
00940 sixdigits.putint(i+100000);
00950 make_five_digits:- sixdigits.sub(2,5);
00960 IF i > largest_line_number THEN largest_line_number:= i;
00970 END;
00980 CLASS lower_line(linetext);
00990 TEXT linetext;
01000 BEGIN COMMENT Text of line which has been pushed below the screen;
01010 REF (lower_line) next_lower_line;
01020 next_lower_line:- lower_lines;
01030 lower_lines:- THIS lower_line;
01040 END;
01050 REF (qregister) PROCEDURE find_qregister(qname);
01060 TEXT qname;
01070 BEGIN COMMENT find the latest qregister with a given name;
01080 COMMENT See description of the "Q" VIDED command;
01090 REF (qregister) scanner;
01100 scanner:- qregisters;
01110 WHILE scanner =/= NONE DO
01120 BEGIN IF scanner.qname EQ qname THEN GOTO out;
01130 scanner:- scanner.next_qregister;
01140 END;
01150 out: find_qregister:- scanner;
01160 END;
01170 TEXT PROCEDURE pop_line;
01180 COMMENT get a line from stack of lines pushed below screen;
01190 INSPECT lower_lines WHEN lower_line DO
01200 BEGIN pop_line:- linetext; lower_lines:- next_lower_line;
01210 END;
01220 PROCEDURE push_line(l); NAME l; TEXT l;
01230 BEGIN COMMENT push a line to stack of lines below screen;
01240 IF upto(l,46) = page_end_marker THEN GOTO out;
01250 IF lower_lines =/= NONE THEN NEW lower_line(l) ELSE
01260 IF NOT (editin.endfile OR endpage)
01270 THEN NEW lower_line(l) ELSE
01280 BEGIN
01290 IF increment <= 0 THEN
01300 BEGIN
01310 IF l.strip =/= NOTEXT THEN NEW lower_line(l);
01320 END ELSE IF from(l,6).strip =/= NOTEXT
01330 THEN NEW lower_line(l);
01340 END;
01350 out: l:- blanks(width);
01360 END;
01370 PROCEDURE get_register(qname); TEXT qname;
01380 COMMENT action of the &G VIDED command. Find a qregister,
01390 puts its contents on top of square on screen equal to the
01400 qregister size;
01410 INSPECT find_qregister(storbokstav(qname)) DO
01420 BEGIN
01430 INTEGER i, hpos, vpos;
01440 INTEGER maxwidth, maxheight, boxwidth, boxheight;
01450 IF increment > 0 THEN
01460 BEGIN COMMENT do not restore line numbers;
01470 IF qwidth = width-8 AND q_horizontalpos = 0 THEN
01480 move_the_cursor_to(8,q_verticalpos);
01490 END;
01500 hpos:= q_horizontalpos; vpos:= q_verticalpos;
01510 maxwidth:= width-hpos;
01520 maxheight:= height-vpos;
01530 boxwidth:= IF maxwidth < qwidth THEN maxwidth ELSE qwidth;
01540 boxheight:= IF maxheight < qheight THEN maxheight ELSE
01550 qheight;
01560 FOR i:= 1 STEP 1 UNTIL boxheight DO
01570 BEGIN
01580 move_the_cursor_to(hpos,vpos+i-1);
01590 outtext(lines[i-1].sub(1,boxwidth));
01600 END;
01610 move_the_cursor_to(hpos,vpos);
01620 END;
01630 PROCEDURE put_register(qname,box_width, box_height);
01640 TEXT qname; INTEGER box_width, box_height;
01650 BEGIN COMMENT action of the &Q VIDED command;
01660 INTEGER hpos, vpos, maxwidth, maxheight, i;
01670 IF box_width= 0 THEN
01680 BEGIN
01690 IF q_horizontalpos=0 AND increment > 0
01700 THEN move_the_cursor_to(8,q_verticalpos);
01710 box_width:= width;
01720 END;
01730 IF box_height = 0 THEN box_height:= height;
01740 storbokstav(qname); hpos:= q_horizontalpos;
01750 vpos:= q_verticalpos;
01760 maxheight:= height-vpos; maxwidth:= width-hpos;
01770 IF box_width > maxwidth THEN box_width:= maxwidth;
01780 IF box_height > maxheight THEN box_height:= maxheight;
01790 INSPECT NEW qregister(box_width, box_height, qname) DO
01800 BEGIN
01810 next_qregister:- qregisters; qregisters:- THIS qregister;
01820 FOR i:= 1 STEP 1 UNTIL box_height DO
01830 lines(i-1):- copy(screen[vpos+i-1].sub(hpos+1,box_width));
01840 END;
01850 END;
01860 PROCEDURE restore_the_whole_screen;
01870
01880 restore_screen(q_verticalpos);
01890
01900 PROCEDURE restore_screen(startline);
01910 INTEGER startline;
01920 COMMENT: If the picture of the screen has been destroyed, then a
01930 call to this procedure will make the picture on the screen equal to
01940 the internal picture in the program. Used by the &R VIDED command;
01950 IF q_display_output THEN
01960 BEGIN TEXT strippedline;
01970 INSPECT terminalout DO
01980 BEGIN
01990 INTEGER h, v, hold, vold, vp;
02000 verybadscreen:= FALSE; ! We are making it good again;
02010 hold:= q_horizontalpos; vold:= q_verticalpos;
02020 home_the_cursor; ! Blank the screen;
02030 IF addaltmode THEN outchr(terminalout,altmode,1);
02040 outchr(terminalout,erasescreen ,1);
02050 IF terminaltype = cdc71310s THEN home_the_cursor;
02060 q_horizontalpos:= q_verticalpos:= 0;
02070 FOR vp:= 0 STEP 1 UNTIL heightm1 DO
02080 FOR v:= startline+vp,startline-vp-1 DO
02090 BEGIN
02100 IF v >= 0 THEN
02110 BEGIN
02120 IF v <= heightm1 THEN
02130 BEGIN
02140 strippedline:- screen[v].strip;
02150 IF strippedline =/= NOTEXT THEN
02160 BEGIN
02170 IF allow_cr THEN
02180 outchr(terminalout,carriagereturn,1)
02190 ELSE home_the_cursor;
02200 move_the_cursor_to(0,v);
02210 outstring(terminalout,strippedline);
02220 END;
02230 END;
02240 END;
02250 END;
02260 forceout(terminalout); dotypeout(terminalout);
02270 synchronize(hold,vold);
02280 END;
02290 END;
02300 PROCEDURE save_lengthes;
02310 COMMENT Save the lengthes of non-blank lines on the screen to know
02320 how much must later be restored;
02330 BEGIN INTEGER i;
02340 FOR i:= 0 STEP 1 UNTIL heightm1 DO
02350 screen_length[i]:= screen[i].strip.length;
02360 END;
02370 PROCEDURE exchange_lines(l1,l2);
02380 INTEGER l1, l2;
02390 BEGIN TEXT firstline;
02400 firstline:- screen(l1);
02410 screen(l1):- screen(l2);
02420 screen(l2):- firstline;
02430 END;
02440 BOOLEAN PROCEDURE five_digits(t); TEXT t;
02450 COMMENT check if a given text contains five digits;
02460 BEGIN
02470 IF t.length > 4 THEN
02480 BEGIN
02490 t.setpos(1);
02500 IF digit(t.getchar) THEN
02510 BEGIN IF digit(t.getchar) THEN
02520 BEGIN IF digit(t.getchar) THEN
02530 BEGIN IF digit(t.getchar) THEN
02540 five_digits:= digit(t.getchar);
02550 END;
02560 END;
02570 END;
02580 END;
02590 END;
02600 CLASS one_more_line_please;
02610 COMMENT Get a line from the input file;
02620 BEGIN INTEGER new_length;
02630 detachloop: detach;
02640 !z_t(8); call(p_editin_inimage);
02650 IF printing THEN
02660 BEGIN
02670 new_length:= editin_image_strip.length;
02680 IF new_length > cover_length THEN cover_length:=
02690 new_length;
02700 outtext(editin.image.sub(1,cover_length));
02710 move_the_cursor_to(0,q_verticalpos);
02720 END ELSE screen(q_verticalpos):= editin_image_strip;
02730 !z_t(-8);
02740 GOTO detachloop;
02750 END;
02760 PROCEDURE shift(frompos, topos, steps);
02770 INTEGER frompos, topos, steps;
02780 COMMENT shift part of the screen downwards, e.g. to get space for
02790 new lines created by &L or &J VIDED commands;
02800 BEGIN INTEGER i;
02810 steps:= steps-1;
02820 IF frompos > topos THEN
02830 BEGIN
02840 FOR i:= 0 STEP 1 UNTIL steps DO
02850 exchange_lines(topos+i,frompos+i);
02860 END ELSE
02870 BEGIN
02880 FOR i:= steps STEP -1 UNTIL 0 DO
02890 exchange_lines(topos+i,frompos+i);
02900 END;
02910 END of shift;
02920 PROCEDURE restore_lines(first,last);
02930 INTEGER first, last;
02940 COMMENT make the terminal screen contents equal to the internal
02950 screen contents for lines [first,last] of the screen;
02960 IF q_display_output THEN
02970 BEGIN
02980 INTEGER i, maxlength;
02990 maxlength:= 1000;
03000 FOR i:= first STEP 1 UNTIL last DO
03010 BEGIN
03020 IF maxlength < width THEN outchr(terminalout,linefeed,1)
03030 ELSE synchronize(0,i);
03040 maxlength:= screen(i).strip.length;
03050 IF maxlength < screen_length(i) THEN
03060 maxlength:= screen_length(i);
03070 outstring(terminalout,screen(i).sub(1,maxlength));
03080 outchr(terminalout,carriagereturn,1);
03090 END;
03100 home_the_cursor;
03110 END;
03120 CLASS editin_true_inimage;
03130 COMMENT input a line from the input text file;
03140 BEGIN TEXT part;
03150 detachloop: detach;
03160 INSPECT editin DO
03170 BEGIN
03180 IF first_input_line THEN first_input_line:= FALSE
03190 ELSE inimage;
03200 part:- scanto(image,tab);
03210 IF image.more THEN
03220 INSPECT editin DO
03230 BEGIN COMMENT there was a tab;
03240 IF other_editin_image == NOTEXT THEN
03250 other_editin_image:- blanks(image.length) ELSE
03260 BEGIN other_editin_image:= NOTEXT;
03270 other_editin_image.setpos(1);
03280 END;
03290 IF numbered_infile THEN
03300 BEGIN IF increment = 0 THEN
03310 BEGIN IF part.length = 5 THEN
03320 BEGIN COMMENT remove line number;
03330 IF five_digits(part) THEN GOTO after_put;
03340 END;
03350 END;
03360 END;
03370 loop:
03380 puttext(other_editin_image,part);
03390 other_editin_image.setpos
03400 (other_editin_image.pos+8
03410 -mod(other_editin_image.pos-1,8));
03420 after_put:
03430 IF image.more THEN
03440 BEGIN
03450 part:- scanto(image,tab);
03460 IF NOT image.more THEN part:- part.strip;
03470 GOTO loop;
03480 END;
03490 part:- image; image:- other_editin_image;
03500 other_editin_image:- part;
03510 END;
03520 image.setpos(1);
03530 END;
03540 GOTO detachloop;
03550 END;
03560 CLASS true_write;
03570 BEGIN COMMENT Output of a line to the output text file;
03580 detachloop: detach;
03590 IF upto(output_line,46) = page_end_marker THEN
03600 BEGIN output_line:= NOTEXT; GOTO fastout;
03610 END;
03620 output_line:- output_line.strip;
03630 IF after_addff THEN
03640 BEGIN after_addff:= FALSE;
03650 sub_header:- IF addff THEN NOTEXT ELSE
03660 copy(IF increment <= 0 THEN output_line ELSE
03670 from(output_line,6));
03680 END;
03690 IF increment NE 0 THEN
03700 BEGIN
03710 IF addff THEN
03720 BEGIN
03730 header:= from(output_line,6); after_addff:= TRUE;
03740 editout.image.setpos(6); editout.outchar(carriagereturn);
03750 editout.outchar(formfeed);
03760 editout.breakoutimage; addff:= FALSE;
03770 out_pagenumber:= out_pagenumber+1;
03780 END;
03790 IF five_digits(output_line) THEN
03800 BEGIN
03810 last_line_number:= output_line.sub(1,5).getint;
03820 IF output_line.length = 5 THEN GOTO goodnumbered;
03830 IF output_line.length >= 8 THEN
03840 BEGIN IF output_line.sub(6,3) = " " THEN
03850 GOTO goodnumbered;
03860 END;
03870 END;
03880 IF output_line.length > 8 THEN
03890 BEGIN
03900 IF output_line.sub(1,8) = " " THEN
03910 output_line:- output_line.sub(9,output_line.length-8);
03920 END;
03930 COMMENT the line had no correct line number;
03940 last_line_number:= last_line_number+1;
03950 editout.outtext(make_five_digits(last_line_number));
03960 editout.outchar(tab); editout.outtext(output_line);
03970 IF FALSE THEN goodnumbered:
03980 BEGIN
03990 editout.outtext(output_line.sub(1,5));
04000 editout.outchar(tab);
04010 IF output_line.length >= 8 THEN
04020 editout.outtext(from(output_line,9));
04030 END;
04040 editout.outimage; output_line:= NOTEXT;
04050 END ELSE
04060 BEGIN COMMENT the output file should NOT
04070 be line numbered;
04080 IF addff THEN
04090 BEGIN editout.outchar(formfeed);
04100 editout.outtext(output_line);
04110 header:= output_line; after_addff:= TRUE;
04120 editout.outimage; output_line:= NOTEXT; addff:= FALSE;
04130 out_pagenumber:= out_pagenumber+1;
04140 END ELSE
04150 BEGIN
04160 editout.image:- output_line;
04170 editout.outimage;
04180 editout.image:- editout_image;
04190 END;
04200 END;
04210 fastout:
04220 GOTO detachloop;
04230 END;
04240 CLASS write;
04250 BEGIN
04260 TEXT exchanger;
04270 detachloop: detach;
04280 IF upto(first_scroll_line,46) = page_end_marker THEN
04290 BEGIN first_scroll_line:= NOTEXT;
04300 GOTO detachloop;
04310 END;
04320 IF top_fill = top_size THEN empty_top_of_page;
04330 BEGIN
04340 top_fill:= top_fill+1;
04350 exchanger:- top_of_page[top_fill];
04360 top_of_page[top_fill]:- first_scroll_line;
04370 first_scroll_line:- exchanger;
04380 END;
04390 GOTO detachloop;
04400 END of CLASS write;
04410 PROCEDURE empty_top_of_page;
04420 COMMENT move lines which previously have been scrolled out
04430 above the top of the screen from an internal buffer
04440 "top_of_page" to the output text file;
04450 BEGIN
04460 INTEGER top_bottom;
04470 FOR top_bottom:= 0 STEP 1 UNTIL top_fill DO
04480 BEGIN
04490 output_line:- top_of_page[top_bottom]; call(p_true_write);
04500 END;
04510 top_fill:= -1;
04520 END;
04530 CLASS scroll;
04540 BEGIN COMMENT scroll screen, top line out, new bottom line in;
04550 INTEGER i;
04560 detachloop: detach;
04570 !z_t(9); first_scroll_line:- screen(0); call(p_write);
04580 FOR i:= 1 STEP 1 UNTIL heightm1 DO
04590 screen(i-1):- screen(i);
04600 screen(heightm1):- first_scroll_line;
04610 IF top_fill + height + 1 = pageheight AND pageheader THEN
04620 BEGIN
04630 IF printing THEN
04640 BEGIN outtext(page_end_marker);
04650 move_the_cursor_to(0,q_verticalpos);
04660 END ELSE screen[heightm1]:= page_end_marker;
04670 END ELSE
04680 IF NOT emptyscroll THEN
04690 BEGIN cover_length:= 0;
04700 call(p_one_more_line_please);
04710 END;
04720 !z_t(-9);
04730 GOTO detachloop;
04740 END;
04750 PROCEDURE addlines(number, printing, leftjustify);
04760 COMMENT Action of &L VIDED command, new lines are inserted
04770 and existing lines pushed downwards;
04780 INTEGER number; BOOLEAN printing, leftjustify;
04790 BEGIN INTEGER sink, vpos, hpos, emptysink;
04800 INTEGER i, addpos; TEXT firstpart;
04810 INTEGER high_number, low_bord_number, add_increment;
04820 TEXT high_line;
04830 !z_t(10); vpos:= q_verticalpos; hpos:= q_horizontalpos;
04840 firstpart:- screen(vpos).sub(1,hpos);
04850 IF increment > 0 THEN
04860 BEGIN
04870 IF vpos > 0 THEN high_line:- screen[vpos-1]
04880 ELSE IF top_fill >= 0
04890 THEN high_line:- top_of_page[top_fill];
04900 IF five_digits(high_line) THEN
04910 low_bord_number:= high_line.sub(1,5).getint
04920 ELSE low_bord_number:= last_line_number;
04930 IF five_digits(screen[vpos]) THEN high_number:=
04940 screen[vpos].sub(1,5).getint ELSE
04950 high_number:= low_bord_number+(number+1)*increment;
04960 add_increment:=
04970 entier((high_number-low_bord_number)/(number+1));
04980 IF add_increment < 1 THEN add_increment:= 1;
04990 END;
05000 IF printing THEN save_lengthes;
05010 sink:= number; emptysink:= sink+vpos-1-heightm1;
05020 IF emptysink < 0 THEN emptysink:= 0;
05030 sink:= sink-emptysink;
05040 FOR i:= 1 STEP 1 UNTIL sink DO
05050 push_line(screen(heightm1-i+1));
05060 FOR i:= 1 STEP 1 UNTIL emptysink DO
05070 BEGIN
05080 IF increment > 0 THEN
05090 BEGIN
05100 high_number:= high_number-add_increment;
05110 IF high_number < 1 THEN high_number:= 1;
05120 line_model.sub(1,5):= make_five_digits(high_number);
05130 END;
05140 push_line(line_model);
05150 END;
05160 line_model.sub(1,5):= NOTEXT;
05170 shift(vpos,vpos+sink,heightm1-vpos+1-sink);
05180 IF increment > 0 THEN
05190 BEGIN
05200 FOR i:= 1 STEP 1 UNTIL sink DO
05210 BEGIN
05220 high_number:= high_number-add_increment;
05230 IF high_number < 1 THEN high_number:= 1;
05240 screen(vpos+sink-i).sub(1,5):=
05250 make_five_digits(high_number);
05260 END;
05270 END;
05280 screen(vpos).sub(1,firstpart.length):= firstpart;
05290 IF increment <= 0 THEN firstpart:= NOTEXT ELSE
05300 BEGIN
05310 IF firstpart =/= NOTEXT THEN
05320 BEGIN
05330 high_number:= high_number-1;
05340 IF high_number < 1 THEN high_number:= 1;
05350 screen(vpos).sub(1,5):= make_five_digits(high_number);
05360 END;
05370 IF five_digits(firstpart) THEN
05380 high_number:= firstpart.sub(1,5).getint ELSE
05390 high_number:= largest_line_number;
05400 firstpart:= NOTEXT;
05410 IF firstpart.length >= 5 THEN firstpart.sub(1,5):=
05420 make_five_digits(high_number+1);
05430 END;
05440 IF leftjustify AND firstpart =/= NOTEXT THEN
05450 BEGIN firstpart:- firstpart.main;
05460 IF increment > 0 THEN firstpart:- from(firstpart,9);
05470 line_model:= frontstrip(firstpart);
05480 high_line:- line_model.strip;
05490 IF high_line.length <= firstpart.length - left_margin THEN
05500 BEGIN
05510 firstpart.sub(1,left_margin):= NOTEXT;
05520 from(firstpart,left_margin+1):= high_line;
05530 END;
05540 line_model:= NOTEXT;
05550 END;
05560 IF printing THEN
05570 BEGIN
05580 restore_lines(vpos,heightm1);
05590 move_the_cursor_to(hpos,vpos);
05600 END;
05610 !z_t(-10);
05620 END;
05630 TEXT PROCEDURE to_continue;
05640 COMMENT restore the screen after user has pushed the
05650 carriage return key;
05660 INSPECT terminalin DO INSPECT terminalout DO
05670 BEGIN
05680 outimage;
05690 outtext("To continue push RETURN:"); breakoutimage;
05700 inimage; to_continue:- copy(terminalin.image.strip);
05710 restore_screen(q_verticalpos);
05720 END;
05730 CLASS editin_inimage;
05740 BEGIN COMMENT input of one line from the input text file;
05750 INTEGER divpos, mindiv;
05760 detachloop: detach;
05770 IF lower_lines == NONE THEN
05780 BEGIN
05790 IF NOT endpage AND NOT editin.endfile THEN
05800 call(p_editin_true_inimage) ELSE
05810 BEGIN COMMENT Input a fictious blank line;
05820 editin.image:= NOTEXT;
05830 IF increment > 0 THEN
05840 editin.image.sub(1,5):= make_five_digits(
05850 largest_line_number+increment);
05860 END;
05870 editin_image_strip:- editin.image.strip;
05880 IF editin.endfile THEN
05890 BEGIN COMMENT Input a fictious blank line;
05900 editin.image:= NOTEXT; editin_image_strip:- NOTEXT;
05910 END ELSE
05920 IF NOT endpage THEN
05930 BEGIN COMMENT Was this last line of a page?;
05940 IF editin_image_strip =/= NOTEXT THEN
05950 BEGIN
05960 IF fetchar(editin_image_strip,
05970 editin_image_strip.length) = formfeed THEN
05980 BEGIN endpage:= TRUE;
05990 editin_image.setpos(editin_image_strip.length);
06000 editin_image.putchar(' ');
06010 editin_image_strip:- editin_image_strip.sub(1,
06020 editin_image_strip.length-1).strip;
06030 END;
06040 END;
06050 END;
06060 END ELSE
06070 BEGIN editin.image:= pop_line;
06080 editin_image_strip:- editin.image.strip;
06090 END;
06100 IF editin_image_strip.length > width THEN
06110 BEGIN COMMENT split too long input lines into two lines;
06120 IF NOT long_line_warned THEN
06130 INSPECT terminalout DO
06140 BEGIN long_line_warned:= TRUE;
06150 breakoutimage;
06160 IF addaltmode THEN outchr(terminalout,altmode,1);
06170 outchr(terminalout,erasescreen,1);
06180 outtext("Input text contains lines longer than");
06190 outint(width,3); outtext(" characters."); outimage;
06200 outtext(
06210 "Such long lines will be split. No further warnings.");
06220 outimage;
06230 to_continue;
06240 END;
06250 mindiv:= editin_image_strip.length-width;
06260 FOR divpos:= widthm1 STEP -1 UNTIL mindiv DO
06270 BEGIN COMMENT split the line at a space character;
06280 IF fetchar(editin_image_strip,divpos) = ' '
06290 THEN GOTO blankfound;
06300 END;
06310 divpos:= width;
06320 blankfound:
06330 editin_image_strip.setpos(divpos);
06340 NEW lower_line(copy(rest(editin_image_strip)));
06350 rest(editin_image_strip):= NOTEXT;
06360 editin_image_strip:- front(editin_image_strip);
06370 END;
06380 IF increment > 0 THEN
06390 BEGIN COMMENT check line number of line numbered file;
06400 IF five_digits(editin_image_strip) THEN
06410 BEGIN
06420 divpos:= editin_image_strip.sub(1,5).getint;
06430 IF largest_line_number < divpos THEN
06440 largest_line_number:= divpos;
06450 END;
06460 END;
06470 GOTO detachloop;
06480 END;
06490 PROCEDURE insert(qname); TEXT qname;
06500 BEGIN COMMENT &I command of VIDED;
06510 INTEGER striplength, hpos, vpos, mindiv, divpos;
06520 TEXT lastpart, stripline, longline;
06530 hpos:= q_horizontalpos; vpos:= q_verticalpos;
06540 stripline:- screen(vpos).strip;
06550 striplength:= stripline.length;
06560 IF striplength + qname.length < width THEN
06570 BEGIN COMMENT New line not longer than screen width;
06580 IF striplength > hpos THEN lastpart:- copy(screen(vpos).
06590 sub(hpos+1,striplength-hpos));
06600 outtext(qname); outtext(lastpart);
06610 move_the_cursor_to(hpos+qname.length,vpos);
06620 END ELSE
06630 BEGIN COMMENT New line has to be split into two lines on
06640 the screen, since it is longer than the screen width;
06650 longline:- conc(stripline.sub(1,hpos),qname,
06660 stripline.sub(hpos+1,striplength-hpos));
06670 mindiv:= longline.length-width;
06680 FOR divpos:= widthm1 STEP -1 UNTIL mindiv DO
06690 BEGIN IF fetchar(longline,divpos) = ' '
06700 THEN GOTO blankfound;
06710 END;
06720 divpos:= width;
06730 blankfound: move_the_cursor_to(0,vpos);
06740 outtext(longline.sub(1,divpos));
06750 make_blank(width-divpos);
06760 IF vpos = heightm1 THEN
06770 BEGIN
06780 move_the_cursor_to(0,vpos);
06790 outchr(terminalout,linefeed,1);
06800 call(p_scroll);
06810 vpos:= vpos-1;
06820 move_the_cursor_to(0,heightm1);
06830 END ELSE move_the_cursor_to(0,vpos+1);
06840 addlines(1,TRUE,FALSE);
06850 outtext(longline.sub(divpos+1,longline.length-divpos));
06860 hpos:= hpos+qname.length;
06870 IF hpos < divpos THEN
06880 move_the_cursor_to(hpos,vpos) ELSE
06890 move_the_cursor_to(hpos-divpos,vpos+1);
06900 END;
06910 END of insert;
06920 INTEGER PROCEDURE written_lines;
06930 COMMENT VIDED strips blank lines from the bottom of the page
06940 when outputting a page to the output text file. This procedure
06950 finds how many non-blank lines there are to output;
06960 BEGIN TEXT check_line; INTEGER i, print_height;
06970 IF lower_lines == NONE AND (endpage OR editin.endfile) THEN
06980 BEGIN
06990 FOR print_height:= heightm1 STEP -1 UNTIL 0 DO
07000 BEGIN
07010 check_line:- screen(print_height);
07020 IF increment > 0 THEN check_line:- from(check_line,6);
07030 IF check_line.strip =/= NOTEXT THEN GOTO out;
07040 END;
07050 print_height:= -1;
07060 out:
07070 END ELSE print_height:= heightm1;
07080 written_lines:= print_height;
07090 END;
07100 PROCEDURE printpage;
07110 BEGIN COMMENT Output a page to the output text file;
07120 INTEGER i, print_height;
07130 empty_top_of_page;
07140 print_height:= written_lines;
07150 FOR i:= 0 STEP 1 UNTIL print_height DO
07160 BEGIN
07170 output_line:- screen[i]; call(p_true_write);
07180 END;
07190 COMMENT Output lines which have been pushed below the screen;
07200 WHILE NOT lower_lines == NONE DO
07210 BEGIN output_line:- pop_line;
07220 call(p_true_write);
07230 END;
07240 COMMENT Output lines which have not yet been read from the
07250 input text file;
07260 IF NOT endpage AND NOT editin.endfile THEN GOTO get_a_line;
07270 WHILE NOT endpage AND NOT editin.endfile DO
07280 BEGIN
07290 output_line:- editin_image_strip; call(p_true_write);
07300 get_a_line:
07310 call(p_editin_inimage);
07320 END;
07330 END;
07340 COMMENT Main body of the CLASS VIDED1: initialization
07350 of certain variables;
07355 allow_cr:= TRUE;
07360 editout_image:- editout.image;
07370 sixdigits:- blanks(6);
07380 p_one_more_line_please:- NEW one_more_line_please;
07390 p_editin_true_inimage:- NEW editin_true_inimage;
07400 p_true_write:- NEW true_write;
07410 p_write:- NEW write;
07420 p_editin_inimage:- NEW editin_inimage;
07430 p_scroll:- NEW scroll; printing:= TRUE;
07440 page_end_marker:- copy(
07450 "***??? END OF PAGE *** USE &PI COMMAND ***???");
07460 first_text_pos:= IF increment = 0 THEN 0 ELSE 8;
07470 INNER;
07480 END;