default format for arrays, objects, null, explicit undefined, and DOM nodes

src/format.js

@@ -1,4 +1,5 @@
 import {format as isoformat} from "isoformat";
+import {html} from "htl";
 
 // Note: use formatAuto (or any other localized format) to present values to the
 // user; stringify is only intended for machine values.
@@ -18,6 +19,34 @@ export const formatLocaleNumber = localize(locale => {
   return value => value === 0 ? "0" : value.toLocaleString(locale); // handle negative zero
 });
 
+export function formatObjects(format, circular = true) {
+  return value => value === null ? gray("null")
+  : value === undefined ? gray("undefined")
+  : Number.isNaN(value) ? gray(NaN)
+  : circular && Array.isArray(value) ? formatArray(value)
+  : circular && isTypedArray(value) ? formatArray(value)
+  : value instanceof Date ? formatDate(value)
+  : circular && value instanceof Node ? value
+  : circular && typeof value === "object" ? formatObject(value)
+  : format(value);
+}
+
+function isTypedArray(_) {
+  return _?.prototype?.__proto__?.constructor?.name == "TypedArray";
+}
+
+function formatObject(o) {
+  const subformat = formatObjects(formatAuto, false);
+  return `{${Object.entries(o).map(([key, value]) => `${key}: ${subformat(value)}`).join(", ")}}`;
+}
+
+function formatArray(value) {
+  const subformat = formatObjects(formatAuto, false);
+  const l = value.length;
+  value = Array.from({length: Math.min(30, l)}, (_, i) => subformat(value[i]));
+  return `[${value.join(", ")}${l > 30 ? "…" : "" }]`;
+}
+
 export const formatAuto = formatLocaleAuto();
 
 export const formatNumber = formatLocaleNumber();
@@ -45,3 +74,7 @@ export function localize(f) {
   let key = localize, value;
   return (locale = "en") => locale === key ? value : (value = f(key = locale));
 }
+
+function gray(label) {
+  return html`<span class=gray>${label}`;
+}

src/style.css

@@ -241,6 +241,10 @@ form.__ns__-table {
   padding: 3px 6.5px 3px 0;
 }
 
+.__ns__-table td .gray {
+  color: #888;
+}
+
 .__ns__-table tr > :not(:first-of-type) {
   padding-left: var(--length2);
 }

src/table.js

@@ -1,10 +1,10 @@
 import {html} from "htl";
 import {arrayify, maybeColumns} from "./array.js";
 import {length} from "./css.js";
-import {formatDate, formatLocaleAuto, formatLocaleNumber} from "./format.js";
+import {formatDate, formatLocaleAuto, formatLocaleNumber, formatObjects} from "./format.js";
 import {newId} from "./id.js";
 import {identity} from "./identity.js";
-import {defined, ascending, descending} from "./sort.js";
+import {ascending, descending} from "./sort.js";
 
 const rowHeight = 22;
 
@@ -130,8 +130,8 @@ function initialize(
     input.value = i;
     if (d != null) for (let j = 0; j < columns.length; ++j) {
       let column = columns[j];
+      if (!(column in d)) continue;
       let value = d[column];
-      if (!defined(value)) continue;
       value = format[column](value, i, data);
       if (!(value instanceof Node)) value = document.createTextNode(value);
       itr.childNodes[j + 1].appendChild(value);
@@ -334,9 +334,9 @@ function formatof(base = {}, data, columns, locale) {
       continue;
     }
     switch (type(data, column)) {
-      case "number": format[column] = formatLocaleNumber(locale); break;
-      case "date": format[column] = formatDate; break;
-      default: format[column] = formatLocaleAuto(locale); break;
+      case "number": format[column] = formatObjects(formatLocaleNumber(locale)); break;
+      case "date": format[column] = formatObjects(formatDate); break;
+      default: format[column] = formatObjects(formatLocaleAuto(locale)); break;
     }
   }
   return format;

test/inputs/tables.js

@@ -28,3 +28,32 @@ export function tableCustomHeader() {
 export function tableCustomHeaderHtml() {
   return Inputs.table([{foo: "hello"}], {header: {foo: html`<i>Foo</i>`}});
 }
+
+export function tableVariousObjects() {
+  return Inputs.table([
+    {A: null},
+    {A: undefined}, // explicit undefined
+    {},
+    {A: ["a", "b"]},
+    {A: Float32Array.from([1, 2, 3])},
+    {A: Array.from({length: 30}, (_, i)=> i)},
+    {A: Array.from({length: 31}, (_, i)=> i)},
+    {A: [[1, 2], ["a"]]},
+    {A: {key: "value"}},
+    {A: {key: {key: "value"}}}
+  ]);
+}
+
+export function tableCircular() {
+  const o = {};
+  o.circular = o;
+  return Inputs.table([
+    {A: o}
+  ]);
+}
+
+export function tableHtml() {
+  return Inputs.table([
+    {A: html`<span style="font-variant: small-caps">hello`}
+  ]);
+}

test/output/tableCircular.html

@@ -0,0 +1,17 @@
+<form class="__ns__ __ns__-table" id="__ns__-1" style="max-height: 274px;">
+  <table style="table-layout: fixed;">
+    <thead>
+      <tr>
+        <th><input type="checkbox"></th>
+        <th title="A"><span></span>A</th>
+      </tr>
+    </thead>
+    <tbody>
+      <tr>
+        <td><input type="checkbox" value="0"></td>
+        <td>{circular: [object Object]}</td>
+      </tr>
+    </tbody>
+  </table>
+  <style></style>
+</form>

test/output/tableHtml.html

@@ -0,0 +1,17 @@
+<form class="__ns__ __ns__-table" id="__ns__-1" style="max-height: 274px;">
+  <table style="table-layout: fixed;">
+    <thead>
+      <tr>
+        <th><input type="checkbox"></th>
+        <th title="A"><span></span>A</th>
+      </tr>
+    </thead>
+    <tbody>
+      <tr>
+        <td><input type="checkbox" value="0"></td>
+        <td><span style="font-variant: small-caps">hello</span></td>
+      </tr>
+    </tbody>
+  </table>
+  <style></style>
+</form>

test/output/tableVariousObjects.html

@@ -0,0 +1,53 @@
+<form class="__ns__ __ns__-table" id="__ns__-1" style="max-height: 274px;">
+  <table style="table-layout: fixed;">
+    <thead>
+      <tr>
+        <th><input type="checkbox"></th>
+        <th title="A"><span></span>A</th>
+      </tr>
+    </thead>
+    <tbody>
+      <tr>
+        <td><input type="checkbox" value="0"></td>
+        <td><span class="gray">null</span></td>
+      </tr>
+      <tr>
+        <td><input type="checkbox" value="1"></td>
+        <td><span class="gray">undefined</span></td>
+      </tr>
+      <tr>
+        <td><input type="checkbox" value="2"></td>
+        <td></td>
+      </tr>
+      <tr>
+        <td><input type="checkbox" value="3"></td>
+        <td>[a, b]</td>
+      </tr>
+      <tr>
+        <td><input type="checkbox" value="4"></td>
+        <td>{0: 1, 1: 2, 2: 3}</td>
+      </tr>
+      <tr>
+        <td><input type="checkbox" value="5"></td>
+        <td>[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29]</td>
+      </tr>
+      <tr>
+        <td><input type="checkbox" value="6"></td>
+        <td>[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29…]</td>
+      </tr>
+      <tr>
+        <td><input type="checkbox" value="7"></td>
+        <td>[1,2, a]</td>
+      </tr>
+      <tr>
+        <td><input type="checkbox" value="8"></td>
+        <td>{key: value}</td>
+      </tr>
+      <tr>
+        <td><input type="checkbox" value="9"></td>
+        <td>{key: [object Object]}</td>
+      </tr>
+    </tbody>
+  </table>
+  <style></style>
+</form>