Function doGuessOrdinal

src/data/helper/sourceHelper.ts:354–463

(
    data: Source['data'],
    sourceFormat: Source['sourceFormat'],
    seriesLayoutBy: Source['seriesLayoutBy'],
    dimensionsDefine: Source['dimensionsDefine'],
    startIndex: Source['startIndex'],
    dimIndex: DimensionIndex
)

// dimIndex may be overflow source data.
// return {BE_ORDINAL}
function doGuessOrdinal(
    data: Source['data'],
    sourceFormat: Source['sourceFormat'],
    seriesLayoutBy: Source['seriesLayoutBy'],
    dimensionsDefine: Source['dimensionsDefine'],
    startIndex: Source['startIndex'],
    dimIndex: DimensionIndex
): BeOrdinalValue {
    let result;
    // Experience value.
    const maxLoop = 5;

    if (isTypedArray(data)) {
        return BE_ORDINAL.Not;
    }

    // When sourceType is 'objectRows' or 'keyedColumns', dimensionsDefine
    // always exists in source.
    let dimName;
    let dimType;
    if (dimensionsDefine) {
        const dimDefItem = dimensionsDefine[dimIndex];
        if (isObject(dimDefItem)) {
            dimName = dimDefItem.name;
            dimType = dimDefItem.type;
        }
        else if (isString(dimDefItem)) {
            dimName = dimDefItem;
        }
    }

    if (dimType != null) {
        return dimType === 'ordinal' ? BE_ORDINAL.Must : BE_ORDINAL.Not;
    }

    if (sourceFormat === SOURCE_FORMAT_ARRAY_ROWS) {
        const dataArrayRows = data as OptionSourceDataArrayRows;
        if (seriesLayoutBy === SERIES_LAYOUT_BY_ROW) {
            const sample = dataArrayRows[dimIndex];
            for (let i = 0; i < (sample || []).length && i < maxLoop; i++) {
                if ((result = detectValue(sample[startIndex + i])) != null) {
                    return result;
                }
            }
        }
        else {
            for (let i = 0; i < dataArrayRows.length && i < maxLoop; i++) {
                const row = dataArrayRows[startIndex + i];
                if (row && (result = detectValue(row[dimIndex])) != null) {
                    return result;
                }
            }
        }
    }
    else if (sourceFormat === SOURCE_FORMAT_OBJECT_ROWS) {
        const dataObjectRows = data as OptionSourceDataObjectRows;
        if (!dimName) {
            return BE_ORDINAL.Not;