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/**
* One rendered row (SPEC.md §3.3).
*
* Memoised, because a scroll re-renders the whole window and the row itself is
* the only thing in this package that is rendered dozens of times per frame.
*/
import { memo } from "react";
import { cx } from "./cx";
import styles from "./styles/JsonViewer.module.scss";
import type { JsonKind, JsonPath, JsonRow } from "./types";
export interface RowProps {
/** DOM id, so the tree can point `aria-activedescendant` at it. */
id: string;
row: JsonRow;
active: boolean;
matched: boolean;
currentMatch: boolean;
showDataTypes: boolean;
quoteKeys: boolean;
onToggle: (path: JsonPath) => void;
onActivate: (index: number) => void;
onCopyPath: (row: JsonRow) => void;
onCopyValue: (row: JsonRow) => void;
onShowFull: (row: JsonRow, anchor: HTMLElement) => void;
onRowClick?: (row: JsonRow, event: React.MouseEvent) => void;
renderValue?: (row: JsonRow) => React.ReactNode;
}
/**
* Whether a type badge would tell the reader anything new.
*
* `showDataTypes` earns its keep on `"42"` versus `42`. It does not on a row
* that already reads `undefined`, `function retry()` or `{ 3 keys }` — there it
* just prints the word twice ("draft: undefined undefined"), which is noise
* dressed up as information.
*/
function typeIsInformative(kind: JsonKind): boolean {
switch (kind) {
case "string":
case "number":
case "boolean":
case "bigint":
case "date":
return true;
default:
return false;
}
}
/** Which colour token a value gets. Kept out of the render path as a lookup. */
function valueClass(kind: JsonKind): string {
switch (kind) {
case "string":
return styles.string!;
case "number":
case "bigint":
return styles.number!;
case "boolean":
return styles.boolean!;
case "null":
case "undefined":
return styles.null!;
case "circular":
case "unknown":
case "symbol":
case "function":
return styles.special!;
case "object":
case "array":
case "map":
case "set":
return styles.container!;
default:
return styles.value!;
}
}
export const Row = memo(function Row({
id,
row,
active,
matched,
currentMatch,
showDataTypes,
quoteKeys,
onToggle,
onActivate,
onCopyPath,
onCopyValue,
onShowFull,
onRowClick,
renderValue,
}: RowProps) {
const hasKey = row.key !== undefined && !row.closing;
const label = quoteKeys && typeof row.key === "string" ? `"${row.label}"` : row.label;
return (
<div
id={id}
// A closing bracket is the same tree item as its opening row, so it is
// presentational — otherwise every container would be announced twice
// and cost two arrow presses to walk past.
role={row.closing ? "none" : "treeitem"}
// A bare `}` between tree items is noise in a screen reader's browse
// mode; the item it closes has already been announced with its state.
aria-hidden={row.closing ? "true" : undefined}
aria-level={row.closing ? undefined : row.depth + 1}
aria-posinset={row.closing ? undefined : row.posInSet}
aria-setsize={row.closing ? undefined : row.setSize}
aria-expanded={row.expandable && !row.closing ? row.expanded : undefined}
aria-selected={row.closing ? undefined : active || undefined}
data-row-index={row.index}
data-testid={`json-row-${row.index}`}
className={cx(
styles.row,
active && styles.rowActive,
currentMatch ? styles.rowMatchCurrent : matched && styles.rowMatch,
)}
onMouseDown={() => {
if (!row.closing) onActivate(row.index);
}}
onClick={(event) => {
if (!row.closing) onRowClick?.(row, event);
}}
onDoubleClick={() => {
if (row.expandable) onToggle(row.path);
}}
>
<span className={styles.guides} aria-hidden="true">
{Array.from({ length: row.depth }, (_, level) => (
<span key={level} className={styles.guide} />
))}
</span>
{row.expandable && !row.closing ? (
<button
type="button"
tabIndex={-1}
aria-hidden="true"
className={cx(styles.twisty, row.expanded && styles.twistyOpen)}
onClick={(event) => {
event.stopPropagation();
onToggle(row.path);
}}
>
<span className={styles.twistyGlyph}>{"▸"}</span>
</button>
) : (
<span className={styles.twistySpacer} aria-hidden="true" />
)}
{hasKey ? (
<>
<span className={styles.key}>{label}</span>
<span className={styles.punct}>{": "}</span>
</>
) : null}
{renderValue && !row.closing ? (
renderValue(row)
) : (
<span className={cx(styles.value, valueClass(row.kind))}>{row.display}</span>
)}
{showDataTypes && !row.closing && typeIsInformative(row.kind) ? (
<span className={styles.type}>{row.kind}</span>
) : null}
{row.truncated ? (
<button
type="button"
tabIndex={-1}
className={styles.more}
aria-label={`Show the full value of ${label || "this node"}`}
onClick={(event) => {
event.stopPropagation();
onShowFull(row, event.currentTarget);
}}
>
{"…"}
</button>
) : null}
{row.closing ? null : (
<span className={styles.actions}>
<button
type="button"
tabIndex={-1}
className={styles.action}
aria-label={`Copy the path to ${label || "the root"}`}
onClick={(event) => {
event.stopPropagation();
onCopyPath(row);
}}
>
path
</button>
<button
type="button"
tabIndex={-1}
className={styles.action}
aria-label={`Copy the value of ${label || "the root"}`}
onClick={(event) => {
event.stopPropagation();
onCopyValue(row);
}}
>
value
</button>
</span>
)}
</div>
);
});
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