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

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

import pipe from 'ramda/src/pipe';
import map from 'ramda/src/map';
import prop from 'ramda/src/prop';
import sum from 'ramda/src/sum';
import min from 'ramda/src/min';
import reduce from 'ramda/src/reduce';
import converge from 'ramda/src/converge';
import subtract from 'ramda/src/subtract';
import partialRight from 'ramda/src/partialRight';
import divide from 'ramda/src/divide';
import add from 'ramda/src/add';
import zip from 'ramda/src/zip';
import multiply from 'ramda/src/multiply';
import identity from 'ramda/src/identity';
import reduceColumnConstraints from './reduceColumnConstraints';
const mapMinWidths = map(prop('minWidth'));
const mapspreads = map(prop('spread')); // Compute the normal content density for each column,
// that is content density with the zero reference as
// the shortest column.

const mapNormalContentDensity = converge((m, list) => {
  return map(partialRight(subtract, [m]))(list);
}, [reduce(min, Infinity), identity]);
const weightContentDensity = converge((s, list) => {
  return map(partialRight(divide, [s]))(list);
}, [sum, identity]);
const mapWeightedColumnCoeffs = pipe(map(prop('contentDensity')), mapNormalContentDensity, weightContentDensity);
const totalMinWidths = pipe(mapMinWidths, sum);
export default function computeColumnWidths(display) {
  const contentWidth = display.contentWidth;
  let shouldClampWidth = !display.forceStretch;
  const columnConstraints = reduceColumnConstraints(display.cells);
  const minWidths = mapMinWidths(columnConstraints);
  const spreads = mapspreads(columnConstraints);
  const sumOfMinWidths = totalMinWidths(columnConstraints);

  if (contentWidth < sumOfMinWidths) {
    return minWidths;
  }

  const widthToAssign = contentWidth - sumOfMinWidths;
  const clampWidths = pipe(zip(spreads), map(reduce(min, Infinity)));
  const columns = pipe(mapWeightedColumnCoeffs, map(multiply(widthToAssign)), zip(minWidths), map(reduce(add, 0)), shouldClampWidth ? clampWidths : identity)(columnConstraints);
  return columns;
}
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