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|
// © Copyright 2022, Scott Gasch
//
// antlr4 -Dlanguage=Python3 ./chords.g4
//
// Hi, self. In ANTLR grammars, there are two separate types of symbols: those
// for the lexer and those for the parser. The former begin with a CAPITAL
// whereas the latter begin with lowercase. The order of the lexer symbols
// is the order that the lexer will recognize them in. There's a good tutorial
// on this shit at:
//
// https://tomassetti.me/antlr-mega-tutorial/
//
// There are also a zillion premade grammars at:
//
// https://github.com/antlr/grammars-v4
grammar chords;
parse
: rootNote majMinSusPowerExpr* addNotesExpr* overBassNoteExpr*
| rootNote majMinSusPowerExpr* addNotesExpr extensionExpr* overBassNoteExpr
;
rootNote
: NOTE
;
overBassNoteExpr
: SLASH NOTE
;
majMinSusPowerExpr
: majExpr
| minExpr
| susExpr
| diminishedExpr
| augmentedExpr
| powerChordExpr
;
majExpr: MAJOR;
minExpr: MINOR;
susExpr: SUS ('2'|'4');
diminishedExpr: DIMINISHED;
augmentedExpr: AUGMENTED;
powerChordExpr: '5';
addNotesExpr
: ADD* SIX
| ADD* SEVEN
| MAJ_SEVEN
| MIN_SEVEN
| ADD* NINE
| ADD* ELEVEN
;
extensionExpr
: INTERVAL
;
SPACE: [ \t\r\n] -> skip;
NOTE: (AS|BS|CS|DS|ES|FS|GS) ;
AS
: ('A'|'a')
| ('Ab'|'ab')
| ('A#'|'a#')
;
BS
: ('B'|'b')
| ('Bb'|'bb')
;
CS
: ('C'|'c')
| ('C#'|'c#')
;
DS
: ('D'|'d')
| ('Db'|'db')
| ('D#'|'d#')
;
ES
: ('E'|'e')
| ('Eb'|'eb')
;
FS
: ('F'|'f')
| ('F#'|'f#')
;
GS
: ('G'|'g')
| ('Gb'|'gb')
| ('G#'|'g#')
;
MAJOR: ('M'|'Maj'|'maj'|'Major'|'major');
MINOR: ('m'|'min'|'minor');
SUS: ('sus'|'suspended');
DIMINISHED: ('dim'|'diminished'|'-');
AUGMENTED: ('aug'|'augmented'|'+');
SLASH: ('/'|'\\');
ADD: ('add'|'Add'|'dom');
SIX: '6';
SEVEN: '7';
NINE: '9';
ELEVEN: '11';
MAJ_SEVEN: MAJOR '7';
MIN_SEVEN: MINOR '7';
INTERVAL: (MAJOR|MINOR)* ('b'|'#')* DIGITS ;
DIGITS: [1-9]+ ;
|
