Generate basic/complex tables for performance testing and debugging.

Author: speedytwenty

lib/generate.js

@@ -0,0 +1,80 @@
+const Table = require('..');
+
+const cellContent = ({ x, y, colSpan = 1, rowSpan = 1 }) => {
+  return `${y}-${x} (${rowSpan}x${colSpan})`;
+};
+
+const generateBasicTable = (rows, cols, options = {}) => {
+  const table = new Table(options);
+  for (let y = 0; y < rows; y++) {
+    let row = [];
+    for (let x = 0; x < cols; x++) {
+      row.push(cellContent({ y, x }));
+    }
+    table.push(row);
+  }
+  return table;
+};
+
+const randomNumber = (min, max, op = 'round') => {
+  return Math[op](Math.random() * (max - min) + min);
+};
+
+const next = (alloc, idx, dir = 1) => {
+  if (alloc[idx]) {
+    return next(alloc, idx + 1 * dir);
+  }
+  return idx;
+};
+
+const generateComplexRow = (y, spanX, cols, alloc, options = {}) => {
+  let x = next(alloc, 0);
+  const row = [];
+  while (x < cols) {
+    const { colSpans = {} } = options;
+    const opt = {
+      colSpan: colSpans[x] || next(alloc, randomNumber(x + 1, options.maxCols || cols, 'ceil'), -1) - x,
+      rowSpan: randomNumber(1, spanX),
+    };
+    row.push({ content: cellContent({ y, x, ...opt }), ...opt });
+    if (opt.rowSpan > 1) {
+      for (let i = 0; i < opt.colSpan; i++) {
+        alloc[x + i] = opt.rowSpan;
+      }
+    }
+
+    x = next(alloc, x + opt.colSpan);
+  }
+  return row;
+};
+
+const generateComplexRows = (y, rows, cols, alloc = {}, options = {}) => {
+  const remaining = rows - y;
+  let spanX = remaining > 1 ? randomNumber(1, remaining) : 1;
+  let lines = [];
+  while (spanX > 0) {
+    lines.push(generateComplexRow(y, spanX, cols, alloc, options));
+    y++;
+    spanX--;
+    Object.keys(alloc).forEach((idx) => {
+      alloc[idx]--;
+      if (alloc[idx] <= 0) delete alloc[idx];
+    });
+  }
+  return lines;
+};
+
+const generateComplexTable = (rows, cols, options = {}) => {
+  const table = new Table(options.tableOptions);
+  while (table.length < rows) {
+    let y = table.length || (table.options.head && 1) || 0;
+    generateComplexRows(y, rows, cols, options).forEach((row) => table.push(row));
+  }
+  return table;
+};
+
+module.exports = {
+  generateBasicTable,
+  generateComplexTable,
+  generateComplexRow,
+};

scripts/generate.js

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+/**
+ * See generate.md
+ */
+const { performance } = require('perf_hooks');
+const { generateBasicTable, generateComplexTable, generateComplexRow } = require('../lib/generate');
+
+const argv = process.argv;
+
+const timeScales = [
+  ['millisecond', 1000],
+  ['second', 60],
+  ['minute', 60],
+];
+const duration = (v, scales = [...timeScales]) => {
+  const [unit, min] = scales.shift();
+  if (v > min && scales.length) {
+    return duration(v / min, scales);
+  }
+  let locale = undefined;
+  if (process.env.LANG) {
+    const userLocale = process.env.LANG.match(/[a-z]{2}_[A-Z]{2}/).shift();
+    if (userLocale.match(/^[a-z]{2}[-_][A-Z]{2}$/)) {
+      locale = userLocale.replace(/_/, '-');
+    }
+  }
+  return v.toLocaleString(locale, { style: 'unit', unit });
+};
+
+const argVal = (idx, def = 10) => {
+  if (argv[idx] && argv[idx].match(/^[0-9]+$/)) {
+    return parseInt(argv[idx], 10);
+  }
+  return def;
+};
+const optEnabled = (opt) => argv.indexOf(opt) > -1;
+const optValue = (opt) => {
+  const idx = argv.indexOf(opt);
+  return idx > -1 ? argv[idx + 1] : 0;
+};
+
+const logMemory = (text = '') => {
+  let suffix = 'kb';
+  let used = process.memoryUsage().heapUsed / 1024;
+  if (used % 1024 > 1) {
+    used = used / 1024;
+    suffix = 'mb';
+  }
+  return `Memory usage ${text}: ${used}${suffix}`;
+};
+
+const printHelp = () => {
+  console.log(`node scripts/generate [ROWS = 10] [COLS = 10]`);
+  [
+    ['--print', 'Print the generated table to the screen.'],
+    ['--dump', 'Print the generated table code to the screen.'],
+    ['--complex', 'Generate a complex table (basic tables are generated by default)'],
+    ['--debug', 'Print table debugging output (warnings only).'],
+  ].forEach(([opt, desc]) => console.log(`  ${opt} ${desc}`));
+};
+
+const dumpTable = (t) => {
+  const lines = [];
+  lines.push(`const table = new Table();`);
+  lines.push(`table.push(`);
+  t.forEach((row) => {
+    if (row.length) {
+      let prefix = '    ';
+      let suffix = '';
+      const multiLine = row.length > 1 && row.some((v) => v.content !== undefined);
+      if (multiLine) {
+        lines.push('  [');
+      }
+      const cellLines = [];
+      row.forEach((cell) => {
+        if (cell.content) {
+          const attrib = [];
+          Object.entries(cell).forEach(([k, v]) => {
+            if (!['style'].includes(k)) {
+              attrib.push(`${k}: ${typeof v === 'string' ? `'${v}'` : v}`);
+            }
+          });
+          cellLines.push(`{ ${attrib.join(', ')} },`);
+        } else {
+          cellLines.push(`${typeof cell === 'string' ? `'${cell}'` : cell}`);
+        }
+      });
+      if (multiLine) {
+        cellLines.forEach((cl) => lines.push([prefix, cl, suffix].join('')));
+        lines.push('  ],');
+      } else {
+        lines.push(`  [${cellLines.join(',')}]`);
+      }
+    } else {
+      lines.push('  [],');
+    }
+  });
+  lines.push(');');
+  lines.push('console.log(table.toString());');
+  return lines.forEach((line) => console.log(line));
+};
+
+if (optEnabled('--help')) {
+  printHelp();
+  process.exit(0);
+}
+
+const results = [];
+results.push(logMemory('at startup'));
+
+const rows = argVal(2);
+const cols = argVal(3);
+
+const maxRowSpan = rows > 10 ? Math.ceil(Math.round(rows * 0.1)) : Math.ceil(rows / 2);
+const maxColSpan = cols;
+
+const complex = optEnabled('--complex');
+
+console.log(`Generating ${complex ? 'complex' : 'basic'} table with ${rows} rows and ${cols} columns:`);
+
+if (complex) {
+  console.log(`Max rowSpan: ${maxRowSpan}`, `Max colSpan ${maxColSpan}`);
+}
+
+const options = {
+  tableOptions: {},
+};
+
+if (optEnabled('--compact')) {
+  options.tableOptions.style = { compact: true };
+}
+
+if (optEnabled('--head')) {
+  const head = generateComplexRow(0, 1, cols, {}, { maxCols: cols - 1 });
+  options.tableOptions.head = head;
+}
+
+const colWidth = optValue('--col-width');
+if (colWidth) {
+  options.tableOptions.colWidths = [];
+  for (let i = 0; i < cols; i++) {
+    options.tableOptions.colWidths.push(parseInt(colWidth, 10));
+  }
+}
+
+// console.log(`table: ${rows} rows X ${cols} columns; ${rows * cols} total cells`);
+// console.time('build table');
+const buildStart = performance.now();
+const table = complex ? generateComplexTable(rows, cols, options) : generateBasicTable(rows, cols, options);
+// console.timeEnd('build table');
+results.push(logMemory('after table build'));
+
+results.push(`table built in ${duration(performance.now() - buildStart)}`);
+
+const start = performance.now();
+const output = table.toString();
+results.push(logMemory('after table rendered'));
+results.push(`table rendered in ${duration(performance.now() - start)}`);
+if (optEnabled('--print')) console.log(output);
+if (optEnabled('--dump')) dumpTable(table);
+results.forEach((result) => console.log(result));