92 lines
3.1 KiB
TypeScript
92 lines
3.1 KiB
TypeScript
// Copyright 2022 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import type {
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MessageFormatElement,
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LiteralElement,
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ArgumentElement,
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NumberElement,
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DateElement,
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TimeElement,
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SelectElement,
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PluralElement,
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PoundElement,
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TagElement,
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} from '@formatjs/icu-messageformat-parser';
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import { TYPE } from '@formatjs/icu-messageformat-parser';
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export type VisitorMethod<T extends MessageFormatElement> = (
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element: T,
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parent: MessageFormatElement | null
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) => void;
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export type Visitor = {
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enterLiteral?: VisitorMethod<LiteralElement>;
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exitLiteral?: VisitorMethod<LiteralElement>;
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enterArgument?: VisitorMethod<ArgumentElement>;
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exitArgument?: VisitorMethod<ArgumentElement>;
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enterNumber?: VisitorMethod<NumberElement>;
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exitNumber?: VisitorMethod<NumberElement>;
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enterDate?: VisitorMethod<DateElement>;
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exitDate?: VisitorMethod<DateElement>;
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enterTime?: VisitorMethod<TimeElement>;
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exitTime?: VisitorMethod<TimeElement>;
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enterSelect?: VisitorMethod<SelectElement>;
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exitSelect?: VisitorMethod<SelectElement>;
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enterPlural?: VisitorMethod<PluralElement>;
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exitPlural?: VisitorMethod<PluralElement>;
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enterPound?: VisitorMethod<PoundElement>;
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exitPound?: VisitorMethod<PoundElement>;
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enterTag?: VisitorMethod<TagElement>;
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exitTag?: VisitorMethod<TagElement>;
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};
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export function traverse(
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parent: MessageFormatElement | null,
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elements: Array<MessageFormatElement>,
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visitor: Visitor
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): void {
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for (const element of elements) {
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if (element.type === TYPE.literal) {
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visitor.enterLiteral?.(element, parent);
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visitor.exitLiteral?.(element, parent);
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} else if (element.type === TYPE.argument) {
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visitor.enterArgument?.(element, parent);
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visitor.exitArgument?.(element, parent);
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} else if (element.type === TYPE.number) {
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visitor.enterNumber?.(element, parent);
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visitor.exitNumber?.(element, parent);
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} else if (element.type === TYPE.date) {
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visitor.enterDate?.(element, parent);
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visitor.exitDate?.(element, parent);
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} else if (element.type === TYPE.time) {
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visitor.enterTime?.(element, parent);
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visitor.exitTime?.(element, parent);
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} else if (element.type === TYPE.select) {
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visitor.enterSelect?.(element, parent);
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for (const node of Object.values(element.options)) {
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traverse(element, node.value, visitor);
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}
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visitor.exitSelect?.(element, parent);
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} else if (element.type === TYPE.plural) {
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visitor.enterPlural?.(element, parent);
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for (const node of Object.values(element.options)) {
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traverse(element, node.value, visitor);
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}
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visitor.exitPlural?.(element, parent);
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} else if (element.type === TYPE.pound) {
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visitor.enterPound?.(element, parent);
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visitor.exitPound?.(element, parent);
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} else if (element.type === TYPE.tag) {
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visitor.enterTag?.(element, parent);
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traverse(element, element.children, visitor);
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visitor.exitTag?.(element, parent);
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} else {
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unreachable(element);
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}
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}
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}
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function unreachable(x: never): never {
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throw new Error(`unreachable: ${x}`);
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}
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