Extract railway codes (Blake's better method)

rowspan-blake.js

(function(){

var setValue = function (row, col, value) {
    records[row][col] = value;
    // TESTING ONLY
    var td = testTable.querySelector('tr:nth-child(' + (row + 1) + ') > td:nth-child(' + (col + 1) + ')');
    td.innerText = value;
    // EOF TESTING
};

// http://www.railwaycodes.org.uk/crs/CRSa.shtm
var table = document.querySelector('table div table');
var rows = table.querySelectorAll('tbody tr');
var records = [];
// TESTING ONLY
table.parentNode.parentNode.parentNode.parentNode.parentNode.setAttribute('width', '100%');
table.parentNode.style.height = 'auto';
table.parentNode.style.width = 'auto';
table.parentNode.style.overflow = 'visible';
table.setAttribute('width', '50%');
table.style.float = 'left';
var testTable = document.createElement('table');
testTable.setAttribute('cellspacing', '0');
testTable.setAttribute('cellpadding', '1');
testTable.setAttribute('border', '1');
testTable.setAttribute('width', '50%');
testTable.style.float = 'right';
table.parentNode.appendChild(testTable);
var ignoreEasyRows = true;
var offset = 0; // 9 for first rowspan, 0 to do ALL
var limit = 4;
// EOF TESTING
rows.forEach(function(tr, i) {
    // TESTING ONLY
    if (offset && (i < offset || i > offset + limit)) return;
    var tr = document.createElement('tr');
    testTable.appendChild(tr);
    for (var j = 0; j < 6; j++) {
        var td = document.createElement('td');
        td.appendChild(document.createTextNode("\u00A0"));
        tr.appendChild(td);
    }
    // EOF TESTING
    records.push(new Array(6));
});

rows.forEach(function(tr, i) {
    // TESTING ONLY
    if (offset && (i < offset || i > offset + limit)) return;
    i -= offset;
    var isEasyRow = true;
    // EOF TESTING
    var row = [];
    var tds = tr.querySelectorAll('td');
    Array.prototype.forEach.call(tds, function (td, c) {
        if (tds.length === 6) {
            // All cells
            if (td.rowSpan && td.rowSpan > 1) {
                // TESTING ONLY
                isEasyRow = false;
                // EOF TESTING
                for (var j = 1; j < td.rowSpan; j++) {
                    setValue(i+j, c, td.innerText);
                }
            }
            if (td.colSpan && td.colSpan > 1) {
                // TESTING ONLY
                isEasyRow = false;
                // EOF TESTING
                for (var j = 1; j < td.colSpan; j++) {
                    setValue(i, c+j, td.innerText);
                }
            }
            setValue(i, c, td.innerText);
        } else {
            for (var j = 0; j < 6; j++) {
                if (typeof records[i][j] === 'undefined') {
                    setValue(i, j, td.innerText);
                    break;
                }
            }
        }
    });
    // TESTING ONLY
    if (tds.length === 6) {
        if (ignoreEasyRows && isEasyRow) {
            tr.style.display = 'none';
            var testTr = testTable.querySelector('tr:nth-child(' + (i + 1) + ')');
            testTr.style.display = 'none';
        }
    }
    // EOF TESTING
});

var recordsString = JSON.stringify(records);
console.log(recordsString);
})();