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chord_name_parser.pegjs

// TODO degreeの9, 11, 13, 7(dimMaj7のやつ)を配列に（全部配列にしちゃう？）
Chord
  = r:Root q3:Quality3 q4:Quality4 o:Option s:Suspended t:Tensions {
      const deg = new Array(1+7);
      deg.fill(); // undefinedで埋めないとmap()で空の要素のときの処理がスキップされちゃう

      deg[1] = 'P';
      let c = deg.map( (value, index) => {
        value = (q3.constitute[index] !== undefined) ? q3.constitute[index] : value;

        return value;
      });
      if (q4 !== null) {
        c = c.map( (value, index) => {
          return (q4.constitute[index] !== undefined) ? q4.constitute[index] : value;
        });
      }
      if (o !== null) {
        c = c.map( (value, index) => {
          return (o.constitute[index] !== undefined) ? o.constitute[index] : value;
        });
      }
      if (s !== null) {
        c = c.map( (value, index) => {
          return (s.constitute[index] !== undefined) ? s.constitute[index] : value;
        });
      }
      if (t !== null) {
        t.forEach( tElm => {
          c = c.map( (value, index) => {
            return (tElm.constitute[index] !== undefined) ? tElm.constitute[index] : value;
          });
        });
      }

      return {
        tmp: {
          root: r,
          triad: (s !== null) ? s.type : q3.type,
          tetrad: (q4) ? q4.type : null,
          option: (o !== null) ? o.type : null,
          tensions: t,
        },
        degree: c,
      };
    }
  / _ {
        return {
          tmp: {
            root: null,
            triad: null,
            tetrad: null,
            option: null,
            tensions: null,
          },
          degree: null,
        };
      }

Root
  = 'C♭'     { return 11; }
  / 'C♯'     { return  1; }
  / ['C''Ⅰ'] { return  0; }
  / '♭Ⅰ'    { return 11; }
  / '♯Ⅰ'    { return  1; }
  / 'D♭'     { return  1; }
  / 'D♯'     { return  3; }
  / ['D''Ⅱ'] { return  2; }
  / '♭Ⅱ'    { return  1; }
  / '♯Ⅱ'    { return  3; }
  / 'E♭'     { return  3; }
  / 'E♯'     { return  5; }
  / ['E''Ⅲ'] { return  4; }
  / '♭Ⅲ'    { return  3; }
  / '♯Ⅲ'    { return  5; }
  / 'F♭'     { return  4; }
  / 'F♯'     { return  6; }
  / ['F''Ⅳ'] { return  5; }
  / '♭Ⅳ'    { return  4; }
  / '♯Ⅳ'    { return  6; }
  / 'G♭'     { return  6; }
  / 'G♯'     { return  8; }
  / ['G''Ⅴ'] { return  7; }
  / '♭Ⅴ'    { return  6; }
  / '♯Ⅴ'    { return  8; }
  / 'A♭'     { return  8; }
  / 'A♯'     { return 10; }
  / ['A''Ⅵ'] { return  9; }
  / '♭Ⅵ'    { return  8; }
  / '♯Ⅵ'    { return 10; }
  / 'B♭'     { return 10; }
  / 'B♯'     { return 12; }
  / ['B''Ⅶ'] { return 11; }
  / '♭Ⅶ'    { return 10; }
  / '♯Ⅶ'    { return 12; }

Quality3
  = 'm' {
      const degree = new Array(1 + 7);
      degree[3] = 'm';
      degree[5] = 'P';
      return { type: 'minor', constitute: degree };
    }
  / 'dim' {
      const degree = new Array(1 + 7);
      degree[3] = 'm';
      degree[5] = 'd';
      return { type: 'diminished', constitute: degree };
    }
  / 'aug' {
      const degree = new Array(1 + 7);
      degree[3] = 'M';
      degree[5] = 'A';
      return { type: 'augumented', constitute: degree };
    }
  / '' {
      const degree = new Array(1 + 7);
      degree[3] = 'M';
      degree[5] = 'P';
      return { type: 'major', constitute: degree };
    }

Quality4
  = '6'    {
      const degree = new Array(1 + 7);
      degree[6] = 'M';
      return { type: 'M6', constitute: degree };
    }
  / '7' {
      const degree = new Array(1 + 7);
      degree[7] = 'm';
      return { type: 'm7', constitute: degree };
    }
  / 'Maj7' {
      const degree = new Array(1 + 7);
      degree[7] = 'M';
      return { type: 'Maj7', constitute: degree };
    }
  / '' { return null; }

Option
  = '-5' {
      const degree = new Array(1 + 7);
      degree[5] = 'd';
      return { type: 'd5', constitute: degree };
    }
  / '' { return null; }

Suspended
  = 'sus4' {
      const degree = new Array(1 + 7);
      degree[3] = null;
      degree[4] = 'P';
      return { type: 'sus4', constitute: degree };
    }
  / '' { return null; }

Tensions
  = 'add' t:TensionNote {
      const degree = new Array(1 + 7);
      degree[t.type.degree - 7] = t.name[0];
      return [{ type: t.name, constitute: degree }];
    }
  / '(' t:TensionNote ')' {
      const degree = new Array(1 + 7);
      degree[t.type.degree - 7] = t.name[0];
      return [{ type: t.name, constitute: degree }];
    }
  / '(' t0:TensionNote tn:MultiTensions+ ')' {
      tn.unshift(t0);
      return tn.map(elm => {
        const degree = new Array(1 + 7);
        degree[elm.type.degree - 7] = elm.name[0];
        return {
          type: elm.name,
          constitute: degree,
        }
      });
    }
  / '' { return null; }

MultiTensions
  = ',' _ t:TensionNote { return t; }

TensionNote
  = '♭9'  { return { name: 'm9', type: { degree: 9, altered: 'flatted' } }; }
  / '9'    { return { name: 'M9', type: { degree: 9, altered: 'natural' } }; }
  / '♯9'  { return { name: 'A9', type: { degree: 9, altered: 'sharped' } }; }
  / '11'   { return { name: 'P11', type: { degree: 11, altered: 'natural'} }; }
  / '♯11' { return { name: 'A11', type: { degree: 11, altered: 'sharped' } }; }
  / '♭13' { return { name: 'm13', type: { degree: 13, altered: 'flatted' } }; }
  / '13'   { return { name: 'M13', type: { degree: 13, altered: 'sharped' } }; }
  / 'Maj7' { return { name: 'M7', type: { degree: 14, altered: 'natural' } }; } // dimのMaj7テンション

_ "whitespace"
  = [ \t\n\r]*