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unit status;
{ Keep track of duration, octave, slur and beam status. }
interface
procedure initStatus;
procedure saveStatus(voice: integer);
procedure resetDuration (voice: integer; dur: char);
function duration(voice: integer): char;
function slurLevel(voice: integer): integer;
function beamLevel(voice: integer): integer;
function noBeamMelisma(voice: integer): boolean;
function noSlurMelisma(voice, history: integer): boolean;
function afterSlur(voice: integer): integer;
procedure setUnbeamed(voice: integer);
procedure setUnslurred(voice: integer);
procedure beginBeam(voice: integer; var note: string);
procedure endBeam(voice: integer);
procedure beginSlur(voice: integer; var note: string);
procedure endSlur(voice: integer; var note: string);
procedure activateBeamsAndSlurs(voice: integer);
procedure setOctave(voice: integer);
procedure resetOctave(voice: integer);
function octave(voice: integer): char;
procedure newOctave(voice: integer; dir: char);
procedure initOctaves(octaves: string);
procedure renewPitch (voice: integer; var note: string);
function chordPitch(voice: integer): integer;
procedure renewChordPitch (voice: integer; note: string);
procedure rememberDurations;
procedure restoreDurations;
procedure chordTie(voice: integer; var lab: char);
type int5 = array[1..5] of integer;
procedure getChordTies(voice: integer; var pitches: int5; var labels: string);
implementation uses globals, strings, mtxline, control, utility, notes;
const
init_oct: string = '';
lowest_pitch = -9;
highest_pitch = 61;
type
line_status = record
pitch, chord_pitch, octave_adjust, beam_level, slur_level, after_slur: integer;
octave, lastnote, chord_lastnote, duration, slurID, tieID: char;
beamnext, beamed, slurnext, slurred, no_beam_melisma: boolean;
no_slur_melisma: array[1..12] of boolean;
chord_tie_pitch: int5;
chord_tie_label: string[5];
end;
var current: array[voice_index] of line_status;
lastdur: array[voice_index] of char;
procedure chordTie(voice: integer; var lab: char);
var n: integer;
begin with current[voice] do
begin n:=length(chord_tie_label);
if n=5 then error3(voice,'Only five slur ties allowed per voice');
if n=0 then lab:='T' else lab:=chord_tie_label[n];
inc(lab); chord_tie_label:=chord_tie_label+lab;
inc(n); chord_tie_pitch[n]:=chord_pitch
end
end;
procedure getChordTies(voice: integer; var pitches: int5; var labels: string);
begin with current[voice] do
begin pitches:=chord_tie_pitch; labels:=chord_tie_label; chord_tie_label:='' end
end;
procedure rememberDurations;
var v: voice_index;
begin for v:=1 to nvoices do lastdur[v]:=duration(v) end;
procedure restoreDurations;
var v: voice_index;
begin for v:=1 to nvoices do resetDuration(v,lastdur[v]) end;
function duration(voice: integer): char;
begin duration := current[voice].duration; end;
procedure resetDuration(voice: integer; dur: char);
begin if pos1(dur,durations)=0 then
begin write('Trying to set duration to ',dur,'; ');
error3(voice,'M-Tx system error: resetDuration');
end;
current[voice].duration := dur
end;
procedure activateBeamsAndSlurs(voice: integer);
begin with current[voice] do
begin
if beamnext then begin beamed:=true; beamnext:=false; end;
if slurnext then begin slurred:=true; slurnext:=false; end;
if slurred then inc(after_slur);
end
end;
procedure saveStatus(voice: integer);
begin with current[voice] do
begin chord_pitch := pitch; chord_lastnote := lastnote; end;
end;
function noBeamMelisma(voice: integer): boolean;
begin noBeamMelisma := current[voice].no_beam_melisma; end;
function afterSlur(voice: integer): integer;
begin with current[voice] do
begin afterSlur := after_slur; if (after_slur>0) and (slur_level<1) then
error3(voice,'M-Tx system error: afterSlur and slur_level incompatible)')
end
end;
function octave(voice: integer): char;
begin octave := current[voice].octave; end;
procedure resetOctave(voice: integer);
begin current[voice].octave := ' '; end;
procedure initOctaves(octaves: string);
var i: integer;
begin init_oct:=octaves;
i:=1;
while i<=length(init_oct) do
if init_oct[i]=' ' then delete1(init_oct,i) else inc(i);
end;
function initOctave(voice_stave: stave_index): char;
begin
if voice_stave>length(init_oct) then
if pos1(clef[voice_stave],'Gt08')>0
then initOctave:='4' else initOctave:='3'
else initOctave:=init_oct[voice_stave];
end;
procedure setOctave(voice: integer);
begin current[voice].octave:=initOctave(voiceStave(voice)); end;
procedure newOctave(voice: integer; dir: char);
begin with current[voice] do case dir of
'+': inc(octave);
'-': dec(octave);
end;
end;
function newPitch (voice: integer; note: string; pitch: integer;
lastnote: char): integer;
var interval, npitch: integer;
oct: char;
begin {if debugMode then
write('New pitch for note ',note,' relative to ',lastnote,
' at pitch ',pitch);}
oct:=octaveCode(note);
if oct='=' then oct:=initOctave(voiceStave(voice));
if (oct>='0') and (oct<='9') then
begin pitch:=7*(ord(oct)-ord('0'))-3; lastnote:='f';
removeOctaveCode(oct,note); oct:=octaveCode(note)
end;
interval := ord(note[1])-ord(lastnote);
if interval>3 then dec(interval,7);
if interval<-3 then inc(interval,7);
npitch:=pitch+interval; {if debugMode then write(' was ',npitch);}
while oct<>' ' do
begin if oct='+' then inc(npitch,7) else if oct='-' then dec(npitch,7);
removeOctaveCode(oct,note); oct:=octaveCode(note)
end;
{if debugMode then writeln(' is ',npitch);}
newPitch:=npitch
end;
procedure repitch(var note: string; diff: integer);
procedure delins(var note: string; c1, c2: char; l: integer);
var i, n: integer;
begin n:=length(note); i:=pos1(c1,note); if i=0 then i:=n+1;
while (l>0) and (i<=n) do begin delete1(note,i); dec(n); dec(l); end;
i:=pos1(c2,note);
if i=0 then if length(note)<2 then error('M-Tx program error',print)
else i:=3;
while l>0 do begin insertchar(c2,note,i); dec(l); end;
end;
begin diff:=diff div 7;
if diff>0 then delins(note, '-','+',diff)
else delins(note, '+','-',-diff);
end;
procedure setUnbeamed(voice: integer);
begin current[voice].beamed:=false end;
procedure setUnslurred(voice: integer);
begin with current[voice] do
begin slurred:=false; after_slur:=0; end;
end;
procedure beginBeam(voice: integer; var note: string);
begin with current[voice] do
begin if beamed then
error3(voice, 'Starting a forced beam while another is open');
if beam_level>0 then error3(voice,
'Starting a forced beam while another is open (beamlevel>0)');
inc(beam_level);
beamnext := true; no_beam_melisma:=startsWith(note,'[[');
if no_beam_melisma then predelete(note,1);
end;
end;
procedure endBeam(voice: integer);
begin with current[voice] do
begin if beam_level<1 then error3(voice, 'Closing a beam that was never opened');
dec(beam_level)
end;
setUnbeamed(voice)
end;
function slurLevel(voice: integer): integer;
begin slurLevel := current[voice].slur_level; end;
function beamLevel(voice: integer): integer;
begin beamLevel := current[voice].beam_level; end;
function noSlurMelisma(voice, history: integer): boolean;
begin with current[voice] do
noSlurMelisma := no_slur_melisma[slur_level+history];
end;
function slurLabel(voice: integer; note: string): string;
var sl: char;
begin if note='' then begin slurLabel:=''; exit end;
if length(note)<2 then begin slurLabel:=' '; exit end;
if (note[2]>='0') and (note[2]<='Z') then sl:=note[2] else sl:=' ';
if (sl>='I') and (sl<='T') then
warning3(voice,'Slur label in the range I..T may cause conflict');
slurLabel:=sl
end;
procedure labelSlur(voice: integer; var note: string);
var sl: char;
begin if note='' then exit;
with current[voice] do
begin
if note[1]=')' then inc(slurID,2) else if note[1]='}' then inc(tieID,2);
if (note[1]='(') or (note[1]=')') then sl:=slurID else sl:=tieID;
insertchar(sl,note,2);
if note[1]='(' then dec(slurID,2) else if note[1]='{' then dec(tieID,2);
if slurID<'I' then warning3(voice,'Too many nested slurs may cause conflict');
if tieID<'I' then warning3(voice,'Too many nested ties may cause conflict')
end
end;
procedure beginSlur(voice: integer; var note: string);
var posblind: integer;
begin
with current[voice] do
begin
inc(slur_level); if slur_level>12 then Error3(voice,'Too many open slurs');
no_slur_melisma[slur_level] := startsWith(note,'((') or startsWith(note,'{{');
if no_slur_melisma[slur_level] then predelete(note,1);
if slurLabel(voice,note)='0' then delete1(note,2) else
if slurLabel(voice,note)=' ' then labelSlur(voice,note);
posblind:=pos1('~',note); if posblind>0 then
if hideBlindSlurs then note:='' else delete1(note,posblind);
slurnext := true;
end;
end;
procedure endSlur(voice: integer; var note: string);
var poscontinue, posblind: integer;
contslur: string;
begin with current[voice] do
begin contslur:='';
if slur_level<1 then Error3(voice,'Ending a slur that was never started');
if note[1]=')' then poscontinue:=pos1('(',note)
else if note[1]='}' then poscontinue:=pos1('{',note);
if poscontinue=0 then dec(slur_level) else
begin dec(poscontinue); contslur:=note; predelete(contslur,poscontinue);
shorten(note,poscontinue);
end;
if slur_level=0 then setUnslurred(voice);
if slurLabel(voice,note)='0' then delete1(note,2) else
if slurLabel(voice,note)=' ' then labelSlur(voice,note);
if slurLabel(voice,contslur)='0' then delete1(contslur,2) else
if slurLabel(voice,contslur)=' ' then labelSlur(voice,contslur);
if poscontinue>0 then
begin if note[1]='}' then note:=note+'t'; note[1]:='s';
if contslur[1]='{' then contslur:=contslur+'t'; contslur[1]:='s';
end;
posblind:=pos1('~',note); if posblind>0 then
if hideBlindSlurs then note:='' else delete1(note,posblind);
if (note<>'') and (contslur<>'') then note := note + ' ' + contslur;
end;
end;
procedure renewPitch (voice: integer; var note: string);
var pstat: integer;
begin with current[voice] do
begin pstat:=newPitch (voice, note, chord_pitch, chord_lastnote);
if debugMode then write('Current pitch in voice ',voice,' is ',pitch,
', last note was ',lastnote,', this note is ',note);
pitch := newPitch (voice, note, pitch, lastnote);
if pitch<>pstat then repitch(note,pitch-pstat);
if (pitch<lowest_pitch) and checkPitch then
begin write('Pitch of note ',note,' following ',lastnote,' reported as ',pitch);
error3(voice,'Pitch too low')
end;
if (pitch>highest_pitch) and checkPitch then
begin write('Pitch of note ',note,' following ',lastnote,' reported as ',pitch);
error3(voice,'Pitch too high')
end;
lastnote:=note[1];
if debugMode then writeln(', repitched to ',pitch);
if debugMode and (pitch<>pstat) then
writeln('Pitch from melodic line = ',pitch,
' from last chordal note = ', pstat);
end;
end;
function chordPitch(voice: integer): integer;
begin chordPitch:=current[voice].chord_pitch end;
procedure renewChordPitch (voice: integer; note: string);
begin with current[voice] do
begin chord_pitch:=newPitch(voice,note,chord_pitch,chord_lastnote);
if chord_pitch<lowest_pitch then error3(voice,'Pitch in chord too low');
if chord_pitch>highest_pitch then error3(voice,'Pitch in chord too high');
chord_lastnote:=note[1];
end
end;
procedure initStatus;
var voice: integer;
begin for voice:=1 to nvoices do with current[voice] do
begin duration:=default_duration;
octave_adjust:=0; slur_level:=0; beam_level:=0;
beamed:=false; beamnext:=false;
slurred:=false; slurnext:=false; after_slur:=0;
octave:=initOctave(voiceStave(voice)); slurID:='S'; tieID:='T';
lastnote:='f'; pitch:=7*(ord(octave)-ord('0'))-3;
chord_tie_label:='';
saveStatus(voice);
end;
end;
end.
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