Support Parsing "Sheet Music" into Channels

[AutumnSky1010]

関連Issue

close #3

例

// comment out
// dotted quarter note(C#4)
C#4, 4.
// rest
rest, 4.
// tie and tuplet
tie(C4, 4, 4, 4); tup(4, C4, C4, C4)

現時点での仕様

# 音階を表すアルファベット('C4'の'C'の部分) - Scale symbol (the 'C' part of 'C4')
scaleSymbol ::= A|B|C|D|E|F|G

# 音階の数字('C4'の'4'の部分) - Scale number (the '4' part of 'C4')
scaleNumber ::= 0|1|2|3|4|5|6|7|8

# 音の長さの数字(全音符: 1, 16分音符: 16) - Length number (whole note: 1, sixteenth note: 16)
lengthCount ::= 1|2|4|8|16|32|64

# 長さを表す(16.など) - Length representation (16., etc.)
length ::= <lengthCount> '.'?

# 音階(C#4など) - Scale (C#4, etc.)
scale ::= <scaleSymbol> '#'? <scaleNumber>

# 音符 - Note
note ::= <scale> ',' <length>

# 休符 - Rest
rest ::= 'rest' ',' <length>

# タイの表記方法 - Tie notation
tie ::= 'tie' '(' <scale> ',' <length>|'rest' {',' <length>|'rest'}* ')'

# 連符の表記方法 - Tuplet notation
tuplet ::= 'tup' '(' <length> ',' <scale>|'rest'|<tie> {',' <scale>|'rest'|<tie>}* ')'

# 文末 - End of statement
endOfStatement ::= ';'|\n|\r|\r\n

# 文の定義 - Sentence definition
statement ::= { <note>|<rest>|<tie>|<tuplet> }? <endOfStatement>

# SMSC(SoundMaker SCore)データ - SMSC(SoundMaker SCore) data
smsc ::= <statement>*