@native-html/heuristic-table-plugin/lib/module/helpers/reduceColumnConstraints.js

🔠 A 100% native component using heuristics to render tables in react-native-render-html

import groupBy from 'ramda/src/groupBy';
import prop from 'ramda/src/prop';
import pipe from 'ramda/src/pipe';
import reduce from 'ramda/src/reduce';
import map from 'ramda/src/map';
import flatten from 'ramda/src/flatten';
import values from 'ramda/src/values';
import mapObjIndexed from 'ramda/src/mapObjIndexed';
const getColumnMetrics = pipe(map(prop('constraints')), reduce((columnConstraints, cellConstraints) => {
  return {
    minWidth: Math.max(columnConstraints.minWidth, cellConstraints.minWidth),
    contentDensity: columnConstraints.contentDensity + cellConstraints.contentDensity,
    spread: Math.max(columnConstraints.spread, cellConstraints.contentDensity)
  };
}, {
  minWidth: 0,
  spread: 0,
  contentDensity: 0
}));

function splitColspanCells(cell) {
  if (cell.lenX > 1) {
    const cells = [];

    for (let i = 0; i < cell.lenX; i++) {
      cells[i] = {
        lenX: 1,
        lenY: cell.lenY,
        constraints: {
          minWidth: cell.constraints.minWidth / cell.lenX,
          contentDensity: cell.constraints.contentDensity / cell.lenX
        },
        x: cell.x + i,
        y: cell.y
      };
    }

    return cells;
  }

  return cell;
}

const reduceColumnConstraints = pipe(pipe(map(splitColspanCells), flatten), groupBy(pipe(prop('x'), String)), mapObjIndexed(getColumnMetrics), values);
export default reduceColumnConstraints;
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