GMN Code

---

gmn         : score
            | variables_section score
            ;

Variables section

---

var_section : var_decl
            | var_section var_decl
            ;

var_decl    : varname = string
            | varname = number
            ;

varname     : $[a-z_A-Z][a-z_A-Z0-9]*

Score

---

score       : '{' '}'
            | '{' voicelist '}'
            | voice 
            ;

voicelist   : voice
            | voicelist ',' voice   
            ;

voice       : '[' symbols ']' ;

symbols     :
            | symbols music 
            | symbols tag
            | symbols chord 
            | symbols varname   
            ;

Tags

---

tag         : positiontag
            | rangetag
            ;

positiontag : tagid
            | tagid '<' tagparams '>'
            ;

rangetag    : positiontag '(' symbols ')' ;

tagid       : tagname
            | tagname : integer
            ;

tagname     : \ string


tagparams   : tagparam
            | tagparams ',' tagparam
            ;

tagparam    : tagarg
            | id '=' tagarg
            ;

tagarg      : number
            | number UNIT
            | string
            | varname
            ;

number      : integer | float ;
UNIT        : 'm' | 'cm' | 'mm' | 'in' | 'pt' | 'pc' | 'hs' ;
string      : [a-z_A-Z][a-z_A-Z0-9]*

Chord

---

chord       : '{' chordsymbols '}' ;

chordsymbols: taggedchordsymbol
            | chordsymbols , taggedchordsymbol
            ;

taggedchordsymbol: chordsymbol
            | taglist chordsymbol
            | chordsymbol taglist
            | taglist chordsymbol taglist
            ;

chordsymbol : music 
            | rangechordtag 
            ;

rangechordtag : positiontag  '(' taggedchordsymbol ')'
            ;

taglist     : positiontag
            | taglist positiontag
            ;

Notes

---

music       : note | rest ;

rest        : '_' duration dots
            | '_' '<' integer '>' duration dots
            ;

note        : noteid octave duration dots
            | noteid accidentals octave duration dots
            ;

noteid      : notename
            | notename '<' integer '>'
            ;

notename    : DIATONIC
            | CHROMATIC
            | SOLFEGE
            | "empty"
            ;

DIATONIC    : 'a' | 'b' | 'c' | 'd' | 'e' | 'f' | 'g' | 'h' ;
CHROMATIC   : 'cis' | 'dis' | 'fis' | 'gis' | 'ais' ;
SOLFEGE     : 'do' | 're' | 'mi' | 'fa' | 'sol' | 'la' | 'si' | 'ti'

accidentals : accidental | accidentals accidental ;
accidental  : '#' | '&' ;
octave      : integer ;

duration    :
            | '*' number '/' number
            | '*' number
            | '*' number 'ms'
            | '/' number
            ;

dots        : '.' | '..' | '...' ;