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unit mtxline;
{ Break input up into words, classify them. Supply words and
information about them. }
interface uses globals;
type
music_word = (other, abcdefg, zword, lyrtag,
lparen, rparen, rlparen, lbrac, rbrac,
pmxl, macro, endmacro, mword, oword, rword, nextvoice,
barword, texword, atword, FirstOnly, err );
const
bind_left: array[music_word] of boolean = (
false, false, true, false,
false, true, true, false, true,
true, false, true, false, true, false, true,
false, false, false, false, false );
{ changed bind_left[barword] to false }
var selected: array[voice_index] of boolean;
procedure error3(voice: voice_index; message: string );
procedure warning3(voice: voice_index; message: string );
procedure getNextMusWord (var buf, note: string; var nscan: music_word);
function MusicWord(voice, n: integer): string;
function nextMusicWord(voice: voice_index): string;
function thisNote(voice: voice_index): music_word;
function nextNote(voice: voice_index): music_word;
function getMusicWord(voice: voice_index): string;
procedure gotoBar(voice: voice_index; bar_no: integer);
function endOfBar(voice: voice_index; bar_no: integer): boolean;
function getBar(voice:voice_index; bar: integer): string;
function upper(voice: voice_index): boolean;
procedure clearLabels;
function findVoice(w: string): voice_index0;
procedure selectVoices(line: string);
procedure resetInfo(voice: voice_index; var buf: string);
procedure setVocal(voice: voice_index; voc: boolean);
function isVocal(voice: voice_index): boolean;
procedure setStavePos(voice: voice_index; stave, pos: stave_index);
function voiceStave(voice: voice_index): stave_index;
function voicePos(voice: voice_index): stave_index;
function aloneOnStave(stave: stave_index): boolean;
function companion(voice: voice_index): voice_index;
procedure appendNote(voice: voice_index; nscan: music_word);
procedure appendToLine(voice: voice_index; note: string);
procedure markBar(voice: voice_index);
function numberOfBars(voice: voice_index): integer;
procedure barForward(voice: voice_index; nbars: integer);
procedure regroup(voice: voice_index);
function beatsPerLine: integer;
procedure setExtraLength(voice: voice_index; ext: integer);
function ExtraLength(voice: voice_index): integer;
function musicLineNo(voice: voice_index): paragraph_index0;
procedure setMusicLineNo(voice: voice_index; lno: paragraph_index);
function chordLineNo(voice: voice_index): paragraph_index0;
procedure setChordLineNo(voice: voice_index; lno: paragraph_index);
procedure skipChordBar(voice: voice_index);
procedure describeVoice(voice: voice_index; describe_lyr: string);
function maybeMusicLine(l: string): boolean;
function musicLine(voice: voice_index): string;
implementation uses strings, notes, control, utility;
const
name: array[music_word] of string[9] = (
'?', 'note', 'znote', 'lyricsTag',
'(', ')', ')(', '[', ']',
'PMX<', 'macro', 'endMacro', 'meter', 'ornament', 'rest', '//',
'BAR', 'TeX', '@', 'firstonly', 'ERROR');
type
word_scan = array[1..max_words] of music_word;
line_info = record
here, nword: word_index0;
nbar: bar_index0;
voice_pos, voice_stave, mus, chord: paragraph_index0;
extra: integer;
vocal: boolean;
bar_bound: array[bar_index0] of word_index0;
word_bound: array[word_index0] of integer;
scan: word_scan;
end;
var info: array[voice_index] of line_info;
{ ------------------------------------------------------------- }
function beatsPerLine: integer;
var voice: voice_index;
begin for voice:=1 to nvoices do with info[voice] do
if (nbar>0) or (extra>0) then
begin
if extra mod one_beat > 0
then error3(voice,'Line length not an integer number of beats');
beatsPerLine := nbar*meternum + extra div one_beat;
end;
end;
procedure skipChordBar(voice: voice_index);
begin with info[voice] do
if chord>0 then if P[chord]=barsym then predelete(P[chord],1);
end;
function getBar(voice: voice_index; bar: integer): string;
begin with info[voice] do
getBar := substr(P[mus],word_bound[bar_bound[bar-1]]+1,
word_bound[bar_bound[bar]]-word_bound[bar_bound[bar-1]]);
end;
function musicLine(voice: voice_index): string;
begin musicLine:=P[musicLineNo(voice)]; end;
function musicLineNo(voice: voice_index): paragraph_index0;
begin musicLineNo := info[voice].mus; end;
procedure setMusicLineNo(voice: voice_index; lno: paragraph_index);
begin info[voice].mus := lno; end;
function chordLineNo(voice: voice_index): paragraph_index0;
begin chordLineNo := info[voice].chord; end;
procedure setChordLineNo(voice: voice_index; lno: paragraph_index);
begin info[voice].chord := lno; end;
procedure setVocal(voice: voice_index; voc: boolean);
begin info[voice].vocal:=voc; end;
function isVocal(voice: voice_index): boolean;
begin isVocal := info[voice].vocal; end;
procedure setStavePos(voice: voice_index; stave, pos: stave_index);
begin with info[voice] do begin voice_pos:=pos; voice_stave:=stave; end;
end;
function voiceStave(voice: voice_index): stave_index;
begin voiceStave:=info[voice].voice_stave; end;
function voicePos(voice: voice_index): stave_index;
begin voicePos:=info[voice].voice_pos; end;
function companion(voice: voice_index): voice_index;
var s: integer;
begin s:=info[voice].voice_stave;
if number_on_stave[s]=1 then companion:=voice
else if info[voice].voice_pos=1 then companion:=voice+1
else companion:=voice-1;
end;
procedure regroup(voice: voice_index);
var i, j, j2: word_index0;
begin j2 := 0; with info[voice] do
begin if debugMode then write('Voice ',voice,' has ',nbar,' bars at ');
if debugMode then for i:=1 to nbar+1 do write(bar_bound[i],' ');
for i:=1 to nbar do
begin j2:=bar_bound[i]; j:=j2+1;
while (j<=here) and (bind_left[scan[j]] or (scan[j]=barword)) do
begin inc(bar_bound[i]); inc(j) end;
end;
if extra>0 then bar_bound[nbar+1]:=here;
if debugMode then
begin write(' regrouped to ');
for i:=1 to nbar+1 do write(bar_bound[i],' ')
end;
if debugMode then writeln;
nword := here
end;
end;
procedure resetInfo(voice: voice_index; var buf: string);
begin with info[voice] do
begin buf := P[mus]; P[mus]:='';
bar_bound[0]:=0; word_bound[0]:=0; nbar:=0; here := 0;
end;
end;
procedure clearLabels;
var voice: voice_index;
begin for voice:=1 to nvoices do with info[voice] do
begin chord:=0; mus:=0; end;
end;
procedure appendNote(voice: voice_index; nscan: music_word);
begin with info[voice] do
begin inc(here); if here>max_words then
error3(voice,'Words per line limit exceeded');
scan[here]:=nscan; end;
end;
procedure appendToLine(voice: voice_index; note: string);
begin if note<>'' then with info[voice] do
begin P[mus]:=P[mus]+note+blank; word_bound[here]:=length(P[mus]); end;
end;
procedure markBar(voice: voice_index);
begin with info[voice] do
if nbar=0 then error3(voice,'Empty bar') else bar_bound[nbar]:=here
end;
function numberOfBars(voice: voice_index): integer;
begin numberOfBars := info[voice].nbar; end;
procedure barForward(voice: voice_index; nbars: integer);
begin with info[voice] do
begin
if (nbar+nbars<0) then error3(voice, 'Next voice before bar is full');
inc(nbar,nbars);
if nbar>max_bars then error3(voice,'Bars per line limit exceeded');
if nbars>0 then bar_bound[nbar]:=here;
end;
end;
procedure setExtraLength(voice: voice_index; ext: integer);
begin with info[voice] do begin extra:=ext; scan[here+1]:=other; end;
end;
function ExtraLength(voice: voice_index): integer;
begin ExtraLength := info[voice].extra; end;
function findVoice(w: string): voice_index0;
var i: integer;
begin curtail(w,':'); findVoice:=0;
for i:=1 to nvoices do
if w=voice_label[i] then begin findVoice:=i; exit end;
getNum(w,i); if i=0 then exit;
if (i>0) and (i<=nvoices) then findVoice:=i
else error('Numeric label outside range 1..nvoices',print);
end;
procedure info3(voice: voice_index);
begin with info[voice] do
begin
writeln ('In voice "', voice_label[voice], '" near word ', here, ':');
writeln(' ':word_bound[here],'V')
end
end;
procedure error3(voice: voice_index; message: string );
begin info3(voice); error(' '+message,print) end;
procedure warning3(voice: voice_index; message: string );
begin info3(voice); warning(' '+message,print) end;
function nextMusicWord(voice: voice_index): string;
begin nextMusicWord := MusicWord(voice,info[voice].here); end;
function MusicWord(voice, n: integer): string;
begin with info[voice] do if (n>0) and (n<=nword) then
MusicWord := substr(P[mus],word_bound[n-1]+1,
word_bound[n]-word_bound[n-1]-1)
else MusicWord := '';
end;
function thisNote(voice: voice_index): music_word;
begin with info[voice] do thisNote := scan[here-1]; end;
function nextNote(voice: voice_index): music_word;
begin with info[voice] do nextNote := scan[here]; end;
function endOfBar(voice: voice_index; bar_no: integer): boolean;
begin with info[voice] do endOfBar := here > bar_bound[bar_no]; end;
procedure gotoBar(voice: voice_index; bar_no: integer);
begin with info[voice] do here := bar_bound[bar_no-1]+1; end;
function getMusicWord(voice: voice_index): string;
begin with info[voice] do
begin line_no := orig_line_no[mus];
GetMusicWord := MusicWord(voice,here); inc(here);
end
end;
function maybeMusicLine(l: string): boolean;
var w: string;
nscan: music_word;
begin w:=GetNextWord(l,blank,dummy); maybeMusicLine := false;
if pos1(w[1],'abcdefgr()[]{}CMm')=0 then begin maybeMusicLine := false; exit end;
if pos1(':',w)=0 then begin maybeMusicLine := true; exit end;
GetNextMusWord(w,l,nscan); maybeMusicLine := nscan=abcdefg;
end;
const macro_initialized: boolean=false;
nmacros = 99;
var macro_text: array[1..nmacros] of string;
procedure macroInit;
var i: integer;
begin if macro_initialized then exit else macro_initialized:=true;
for i:=1 to nmacros do macro_text[i]:=''
end;
function identifyMacro(s: string): integer;
var k: integer;
begin predelete(s,2); getNum(s,k); identifyMacro:=k
end;
procedure GetNextMusWord (var buf, note: string; var nscan: music_word);
var maybe_error: string;
procedure expandThisMacro;
var playtag: string[10];
playID: integer;
w: string;
begin macroInit; if length(note)=1 then
error('Can''t terminate a macro that has not been started',print);
playID:=identifyMacro(note); playtag:=toString(playID);
if (playID<1) or (playID>99) then
error('Macro ID '+playtag+' is not in range 1..99',print);
if note[2]='P' then
begin if macro_text[playID]='' then
warning('Macro '+playtag+
' inserts empty text: did you define it before use?',print);
if length(macro_text[playID])+length(buf)>255
then error('Expansion of macro '+playtag+' causes buffer overflow',print)
else begin if debugMode then writeln('Inserting macro '+playtag+' text "'
+macro_text[playID]+'"');
writeln('Buffer before insert: ',buf);
buf:=macro_text[playID]+buf; exit
end
end;
if pos1(note[2],'SR')=0 then error('Second character '+note[2]+
' of macro word should be in "PRS"',print);
macro_text[playID]:='';
repeat w:=getNextWord(buf,blank,dummy);
if w='' then error('Macro definition '+playtag+
' should be terminated on the same input line',print);
if w='M' then begin
if debugMode then writeln('Macro '+playtag+' is: '+macro_text[playID]);
break
end;
if (w[1]='M') and (length(w)>1) then
if (w[2]<>'P') or (identifyMacro(w)=playID) then
error(w+' not allowed inside macro definition '+playtag,print);
macro_text[playID]:=macro_text[playID]+w+' '
until false;
if note[2]='R' then begin note[2]:='P'; buf:=note+' '+buf end
end;
begin note:=GetNextWord(buf,blank,dummy);
if note='' then exit;
if (note[1]='M') and expandMacro then
begin expandThisMacro; GetNextMusWord(buf,note,nscan); exit end;
if note[1]='\' then
begin maybe_error:='';
if note[length(note)]<>'\' then maybe_error:=note;
while (buf<>'') and (note[length(note)]<>'\') do
note:=note+' '+GetNextWord(buf,blank,dummy);
if note[length(note)]<>'\' then
error('Unterminated TeX literal',print);
nscan:=texword;
if maybe_error<>'' then
warning('Possible unterminated TeX literal: '+maybe_error,print);
exit;
end;
if solfaNoteNames then
begin translateSolfa(note[1]); if note[1]='"' then predelete(note,1);
end;
case note[1] of
'a'..'g': nscan:=abcdefg;
'z': nscan:=zword;
'(': nscan:=lparen;
'{': if note[length(note)]='}' then nscan:=lyrtag else nscan:=lparen;
')': if pos1('(',note)=0 then nscan:=rparen else nscan:=rlparen;
'}': if pos1('{',note)=0 then nscan:=rparen else nscan:=rlparen;
'[': nscan:=lbrac;
']': nscan:=rbrac;
'@': nscan:=atword;
'm': nscan:=mword;
'r': nscan:=rword;
'#','-','n','x','?','s','t','D': nscan:=pmxl;
'M': if note='M' then nscan:=endMacro else nscan:=macro;
'G': if pos1('A',note)>0 then nscan:=pmxl else nscan:=other;
'1'..'9': if pos1('/',note)>0 then nscan:=mword else nscan:=pmxl;
'o': nscan:=oword;
'A', 'V': nscan:=FirstOnly;
'/': if note='//' then nscan:=nextvoice
else if note='/' then
begin note:='//'; warning('/ changed to //',print); nscan:=nextvoice;
end
else begin error('Word starts with /: do you mean \?',print);
nscan:=err;
end;
else if pos1('|',note)>0 then nscan:=barword else
nscan:=other;
end;
end;
function upper(voice: voice_index): boolean;
begin with info[voice] do
if (voice_pos=1) and (voice<nvoices) then
upper:=(voice_stave=info[voice+1].voice_stave)
else upper:=false;
end;
procedure describeVoice(voice: voice_index; describe_lyr: string);
var bar, w: integer;
begin with info[voice] do
begin write('Voice `',voice_label[voice],''' is on line ',mus);
if vocal then
begin write(', is vocal'); writeln(describe_lyr); end
else
begin if chord>0 then write(' and has chords on line ',chord);
writeln;
end;
if debugMode then with info[voice] do
begin write('Line has ', nbar, ' bars');
if extra>0 then writeln(' + ', extra, '/64 notes') else writeln;
write('Bars:');
for bar:=1 to nbar do write(' ',getBar(voice,bar),' ');
writeln; write('Word types:');
for w:=1 to nword do write(' ',name[scan[w]]); writeln;
end;
end;
end;
function aloneOnStave(stave: stave_index): boolean;
var v: voice_index;
begin
if number_on_stave[stave]<>2 then aloneOnStave:=true else
begin v:=first_on_stave[stave];
aloneOnStave:= (info[v].mus=0) or (info[v+1].mus=0)
end
end;
procedure selectVoices(line: string);
var i, k: integer;
word: string;
begin
for k:=1 to nvoices do selected[k]:=false;
write('Voice change to: ',line,' = ');
i:=0;
while i<nvoices do
begin word:=GetNextWord(line,blank,dummy);
if word='' then begin writeln; exit; end;
inc(i); write(word,' ');
k:=findVoice(word);
if k=0 then error('This voice is not in the style',print);
selected[k]:=true;
end;
writeln;
end;
end.
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