function initBlendSwitchInGroup()

in toolkit/jb/svg.js [380:438]
30 lines of code
2 McCabe index (conditional complexity)

function initBlendSwitchInGroup(target, id, count, width, height) {
    var lastSelected;
    var lastSelectedText;
    var switchStates = {};

    function switchBlend(blend, text) {
        return function() {
            if (lastSelected && (lastSelected.value !== blend.value) && lastSelectedText) {
                switchStates[lastSelected.value] = false;
                lastSelectedText.attr('fill', 'black');
            }
            if (!blend) return;
            var selected = switchStates[blend.value] ? false : true;
            switchStates[blend.value] = selected;
            text.attr('fill', selected ? 'white' : 'black');
            if (selected) {
                lastSelected = blend;
                lastSelectedText = text;
                return blend.value;
            } else {
                lastSelected = null;
                lastSelectedText = text;
                return '';
            }
        };
    }

    var submit, text, clicks;

    var texts;

    d3.select(target).append('g')
      .attr('transform', 'translate(0,' + ((id * height) + (height / 2) - (count * height / 2)) + ')')
      .call(function(target) {
          texts = BLENDS.map(function(blend, i) {
              return target.append('text').style('cursor', 'pointer')
                           .text(blend.label)
                           .attr('transform', 'translate(' + (i * LETTER_WIDTH) + ',0)');
          })

          texts.forEach(function(text, i) {
              text.append('title').text(BLENDS[i].name);
          });

          submit = Kefir.merge(
              BLENDS.map(function(blend, i) {
                  return Kefir.fromEvents(texts[i].node(), 'click')
                              .map(switchBlend(blend, texts[i]));
              })
          );
      });

    if (DEFAULT_LAYERS_BLENDS[id]) {
        var blendIdx = blendToIndex[DEFAULT_LAYERS_BLENDS[id]];
        switchBlend(BLENDS[blendIdx], texts[blendIdx])();
    }

    return submit;
}