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✏️ Editing: layout-manager.js

const objectAssign = require('object-assign');
const Cell = require('./cell');
const { ColSpanCell, RowSpanCell } = Cell;

(function() {
  function layoutTable(table) {
    table.forEach(function(row, rowIndex) {
      row.forEach(function(cell, columnIndex) {
        cell.y = rowIndex;
        cell.x = columnIndex;
        for (let y = rowIndex; y >= 0; y--) {
          let row2 = table[y];
          let xMax = y === rowIndex ? columnIndex : row2.length;
          for (let x = 0; x < xMax; x++) {
            let cell2 = row2[x];
            while (cellsConflict(cell, cell2)) {
              cell.x++;
            }
          }
        }
      });
    });
  }

function maxWidth(table) {
    let mw = 0;
    table.forEach(function(row) {
      row.forEach(function(cell) {
        mw = Math.max(mw, cell.x + (cell.colSpan || 1));
      });
    });
    return mw;
  }

function maxHeight(table) {
    return table.length;
  }

function cellsConflict(cell1, cell2) {
    let yMin1 = cell1.y;
    let yMax1 = cell1.y - 1 + (cell1.rowSpan || 1);
    let yMin2 = cell2.y;
    let yMax2 = cell2.y - 1 + (cell2.rowSpan || 1);
    let yConflict = !(yMin1 > yMax2 || yMin2 > yMax1);

let xMin1 = cell1.x;
    let xMax1 = cell1.x - 1 + (cell1.colSpan || 1);
    let xMin2 = cell2.x;
    let xMax2 = cell2.x - 1 + (cell2.colSpan || 1);
    let xConflict = !(xMin1 > xMax2 || xMin2 > xMax1);

return yConflict && xConflict;
  }

function conflictExists(rows, x, y) {
    let i_max = Math.min(rows.length - 1, y);
    let cell = { x: x, y: y };
    for (let i = 0; i <= i_max; i++) {
      let row = rows[i];
      for (let j = 0; j < row.length; j++) {
        if (cellsConflict(cell, row[j])) {
          return true;
        }
      }
    }
    return false;
  }

function allBlank(rows, y, xMin, xMax) {
    for (let x = xMin; x < xMax; x++) {
      if (conflictExists(rows, x, y)) {
        return false;
      }
    }
    return true;
  }

function addRowSpanCells(table) {
    table.forEach(function(row, rowIndex) {
      row.forEach(function(cell) {
        for (let i = 1; i < cell.rowSpan; i++) {
          let rowSpanCell = new RowSpanCell(cell);
          rowSpanCell.x = cell.x;
          rowSpanCell.y = cell.y + i;
          rowSpanCell.colSpan = cell.colSpan;
          insertCell(rowSpanCell, table[rowIndex + i]);
        }
      });
    });
  }

function addColSpanCells(cellRows) {
    for (let rowIndex = cellRows.length - 1; rowIndex >= 0; rowIndex--) {
      let cellColumns = cellRows[rowIndex];
      for (let columnIndex = 0; columnIndex < cellColumns.length; columnIndex++) {
        let cell = cellColumns[columnIndex];
        for (let k = 1; k < cell.colSpan; k++) {
          let colSpanCell = new ColSpanCell();
          colSpanCell.x = cell.x + k;
          colSpanCell.y = cell.y;
          cellColumns.splice(columnIndex + 1, 0, colSpanCell);
        }
      }
    }
  }

function insertCell(cell, row) {
    let x = 0;
    while (x < row.length && row[x].x < cell.x) {
      x++;
    }
    row.splice(x, 0, cell);
  }

function fillInTable(table) {
    let h_max = maxHeight(table);
    let w_max = maxWidth(table);
    for (let y = 0; y < h_max; y++) {
      for (let x = 0; x < w_max; x++) {
        if (!conflictExists(table, x, y)) {
          let opts = { x: x, y: y, colSpan: 1, rowSpan: 1 };
          x++;
          while (x < w_max && !conflictExists(table, x, y)) {
            opts.colSpan++;
            x++;
          }
          let y2 = y + 1;
          while (y2 < h_max && allBlank(table, y2, opts.x, opts.x + opts.colSpan)) {
            opts.rowSpan++;
            y2++;
          }

let cell = new Cell(opts);
          cell.x = opts.x;
          cell.y = opts.y;
          insertCell(cell, table[y]);
        }
      }
    }
  }

function generateCells(rows) {
    return rows.map(function(row) {
      if (!Array.isArray(row)) {
        let key = Object.keys(row)[0];
        row = row[key];
        if (Array.isArray(row)) {
          row = row.slice();
          row.unshift(key);
        } else {
          row = [key, row];
        }
      }
      return row.map(function(cell) {
        return new Cell(cell);
      });
    });
  }

function makeTableLayout(rows) {
    let cellRows = generateCells(rows);
    layoutTable(cellRows);
    fillInTable(cellRows);
    addRowSpanCells(cellRows);
    addColSpanCells(cellRows);
    return cellRows;
  }

module.exports = {
    makeTableLayout: makeTableLayout,
    layoutTable: layoutTable,
    addRowSpanCells: addRowSpanCells,
    maxWidth: maxWidth,
    fillInTable: fillInTable,
    computeWidths: makeComputeWidths('colSpan', 'desiredWidth', 'x', 1),
    computeHeights: makeComputeWidths('rowSpan', 'desiredHeight', 'y', 1),
  };
})();

function makeComputeWidths(colSpan, desiredWidth, x, forcedMin) {
  return function(vals, table) {
    let result = [];
    let spanners = [];
    table.forEach(function(row) {
      row.forEach(function(cell) {
        if ((cell[colSpan] || 1) > 1) {
          spanners.push(cell);
        } else {
          result[cell[x]] = Math.max(result[cell[x]] || 0, cell[desiredWidth] || 0, forcedMin);
        }
      });
    });

vals.forEach(function(val, index) {
      if (typeof val === 'number') {
        result[index] = val;
      }
    });

//spanners.forEach(function(cell){
    for (let k = spanners.length - 1; k >= 0; k--) {
      let cell = spanners[k];
      let span = cell[colSpan];
      let col = cell[x];
      let existingWidth = result[col];
      let editableCols = typeof vals[col] === 'number' ? 0 : 1;
      for (let i = 1; i < span; i++) {
        existingWidth += 1 + result[col + i];
        if (typeof vals[col + i] !== 'number') {
          editableCols++;
        }
      }
      if (cell[desiredWidth] > existingWidth) {
        let i = 0;
        while (editableCols > 0 && cell[desiredWidth] > existingWidth) {
          if (typeof vals[col + i] !== 'number') {
            let dif = Math.round((cell[desiredWidth] - existingWidth) / editableCols);
            existingWidth += dif;
            result[col + i] += dif;
            editableCols--;
          }
          i++;
        }
      }
    }

objectAssign(vals, result);
    for (let j = 0; j < vals.length; j++) {
      vals[j] = Math.max(forcedMin, vals[j] || 0);
    }
  };
}