69 lines
2.1 KiB
JavaScript
69 lines
2.1 KiB
JavaScript
export const openBackTrainInfo = (stationInfo, trainData, showNearTrain) => {
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const migrationArray = (stationInfo) => {
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const mainTrainStationPosition = trainData.findIndex(
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(d) => d.split(",")[0] == stationInfo
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);
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const relationMain = (() => {
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if (mainTrainStationPosition == 0) return "head";
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if (mainTrainStationPosition == trainData.length - 1) return "tail";
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return "middle";
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})();
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const subTrainStationPosition = showNearTrain.findIndex(
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(d) => d.split(",")[0] == stationInfo
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);
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const relationSub = (() => {
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if (subTrainStationPosition == 0) return "head";
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if (subTrainStationPosition == showNearTrain.length - 1) return "tail";
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return "middle";
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})();
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switch (relationMain) {
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case "head":
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if (relationSub == "head") {
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return;
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} else if (relationSub == "tail") {
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return [
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...showNearTrain.slice(0, subTrainStationPosition),
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...trainData,
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];
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} else if (relationSub == "middle") {
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return [
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...showNearTrain.slice(0, subTrainStationPosition),
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...trainData,
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];
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} else return;
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case "tail":
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if (relationSub == "head") {
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return [
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...trainData.slice(0, mainTrainStationPosition),
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...showNearTrain,
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];
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} else if (relationSub == "tail") {
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return;
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} else if (relationSub == "middle") {
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return [
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...trainData.slice(0, mainTrainStationPosition),
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...showNearTrain.slice(subTrainStationPosition),
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];
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} else return;
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case "middle":
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if (relationSub == "head") {
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return [
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...trainData.slice(0, mainTrainStationPosition),
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...showNearTrain,
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];
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} else if (relationSub == "tail") {
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return [
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...showNearTrain.slice(0, subTrainStationPosition),
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...trainData.slice(mainTrainStationPosition),
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];
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} else return;
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}
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};
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const array = migrationArray(stationInfo);
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if (!array) return null;
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return array;
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};
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