change_logic.js

function setSumOfDatumDurationsPerMusicExpression(tokens) {
  let areSummingDatumDurations = false
  let sumOfDatumDurations
  let indexOfOpenMusicExpr
  let numExprFlags
  let numExprDots
  for (let i = deepestDepth; i >= 0; i--) {
      tokens.forEach((token, j) => {
        if(token.depth === i+1 && areSummingDatumDurations && token.type === 'OPEN_MUSIC_EXPR'){
            sumOfDatumDurations += token.duration
        }
        if(token.depth != i){
            continue
        }
        if (token.type === 'OPEN_VOICING_EXPR'
            || token.type === 'OPEN_MUSIC_EXPR')
        {
            areSummingDatumDurations = true
            sumOfDatumDurations = 0
            indexOfOpenMusicExpr = j
            numExprFlags = j > 0 && tokens[j - 1].type === 'RHYTHM_FLAGS'
                ? tokens[j - 1].value.length
                : 0
        } else if (token.type === 'CLOSE_VOICING_EXPR'
                    || token.type === 'CLOSE_MUSIC_EXPR')
        {
            areSummingDatumDurations = false
            const k = indexOfOpenMusicExpr
            tokens[k].sumOfDatumDurations = sumOfDatumDurations
            if (tokens[k].duration === 'EQUAL') {
                tokens[k].duration = sumOfDatumDurations
            }
            numExprFlags = j < tokens.length - 1 && tokens[j + 1].type === 'RHYTHM_DOTS'
                ? tokens[j + 1].value.length
                : 0
            tokens[k].duration = calculateFlags(tokens[k].duration, numExprFlags)
            tokens[k].duration = calculateDots(tokens[k].duration, numExprDots)
        } else if (areSummingDatumDurations
                    && token.type === 'DATUM')
        {
            sumOfDatumDurations += token.duration
        }
      }
    )
  }
}


function setSumOfDatumDurationsPerMusicExpression(tokens) {
  let areSummingDatumDurations = false
  let sumOfDatumDurations
  let indexOfOpenMusicExpr
  let numExprFlags
  let numExprDots
  for (let i = deepestDepth; i >= 0; i--) {
      tokens.forEach((token, j) => {
        if(token.depth === i+1 && areSummingDatumDurations && token.type === 'OPEN_MUSIC_EXPR'){
            sumOfDatumDurations += token.duration
        }
        if(token.depth === i){
            if (token.type === 'OPEN_VOICING_EXPR'
                || token.type === 'OPEN_MUSIC_EXPR')
            {
                areSummingDatumDurations = true
                sumOfDatumDurations = 0
                indexOfOpenMusicExpr = j
                numExprFlags = j > 0 && tokens[j - 1].type === 'RHYTHM_FLAGS'
                    ? tokens[j - 1].value.length
                    : 0
            } else if (token.type === 'CLOSE_VOICING_EXPR'
                        || token.type === 'CLOSE_MUSIC_EXPR')
            {
                areSummingDatumDurations = false
                const k = indexOfOpenMusicExpr
                tokens[k].sumOfDatumDurations = sumOfDatumDurations
                if (tokens[k].duration === 'EQUAL') {
                    tokens[k].duration = sumOfDatumDurations
                }
                numExprFlags = j < tokens.length - 1 && tokens[j + 1].type === 'RHYTHM_DOTS'
                    ? tokens[j + 1].value.length
                    : 0
                tokens[k].duration = calculateFlags(tokens[k].duration, numExprFlags)
                tokens[k].duration = calculateDots(tokens[k].duration, numExprDots)
            } else if (areSummingDatumDurations
                        && token.type === 'DATUM')
            {
                sumOfDatumDurations += token.duration
            }
        }
      }
    )
  }
}