Unable to parse slide vertices correctly

[kyubxy]

When parsing a slide, the vertices of the slide path are incorrect.

To reproduce, take the following chart connecting buttons 1 and 2 with a straight slide.

&inote_1=1-2[4:1]

Deserialise the chart contents into chart, and use the following to extract the vertices of the single slide path's segments.

const verts = chart.noteCollections[0][0].slidePaths[0].segments[0].vertices
console.log(verts)

Firstly, we expect vert[0].index to be 0 and vert[1].index to be 1 as NoteLocation indexes the buttons starting at 0. Instead however, we get the following

[ Location { index: 1, group: 0 }, Location { index: 3, group: 0 } ]

which is different from what we were expecting.

I also tested the output of the first slide of 神威 which features a slide with multiple segments.

CanReadCompoundSlide.txt

&inote_1=8<6v4[8:3]

test file

    it("should be able to read the kamui slide", async () => {
        const chartText = await fs.readFile(path.join(testChartPath, "./CanReadCompoundSlide.txt"), "utf-8");

        const simaiFile = new SimaiFile(chartText);
        const chart = SimaiConvert.deserialize(simaiFile.getValue("inote_1")!);

        const segs = chart.noteCollections[0][0].slidePaths[0].segments

        console.log("kamui 0", segs[0])
        console.log("kamui 1", segs[1])

        const vert1 = segs[0].vertices
        const vert2 = segs[1].vertices
        assert.equal(segs.length,2)

        assert.equal(vert1.length,2)
        assert.equal(vert1[0].index , 6)
        assert.equal(vert1[1].index , 5)

        assert.equal(vert2.length,2)
        assert.equal(vert2[0].index , 5)
        assert.equal(vert2[1].index , 3)
    });

The above test did not pass and the 2 console.logs gave

kamui 0 SlideSegment {
  vertices: [ Location { index: 5, group: 0 } ],
  slideType: 2
}
kamui 1 SlideSegment {
  vertices: [ Location { index: 3, group: 0 }, Location { index: 7, group: 0 } ],
  slideType: 3
}

We can also determine that the slide types are correct (2 = RingCcw and 3 = Fold), only the vertices are wrong.

I ran the tests on a fresh copy of the simai.js repo using the existing testing framework present. I have not yet verified whether this issue persists on SimaiSharp. Whenever I get the time, I can take a closer look at solving this issue.