55 lines
1.8 KiB
TypeScript
55 lines
1.8 KiB
TypeScript
import { SimpleType, Type } from "../type";
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import { anglebrackets, braces, Item, keyvalue, opseq, seq } from "./block";
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export function variantInitFor(variantName: string | undefined) : Item[] {
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return variantName === void 0 ? [] : [variantFor(variantName)];
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}
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export function variantFor(variantName: string): Item {
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return keyvalue('_variant', JSON.stringify(variantName));
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}
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export function renderVariant([variantName, t]: [string, SimpleType]): Item {
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let fields: Item[];
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switch (t.kind) {
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case 'unit':
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fields = [];
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break;
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case 'ref':
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case 'set':
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case 'dictionary':
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case 'array':
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fields = [keyvalue('value', renderType(t))];
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break;
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case 'record':
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fields = Array.from(t.fields).map(([nn, tt]) => keyvalue(nn, renderType(tt)));
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break;
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default:
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((_: never) => {})(t);
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throw new Error("Unreachable");
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}
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return braces(variantFor(variantName), ... fields);
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}
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export function renderType(t: Type): Item {
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switch (t.kind) {
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case 'union': return opseq('never', ' | ', ...
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Array.from(t.variants).flatMap(renderVariant));
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case 'unit': return 'null';
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case 'ref': return t.typeName;
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case 'set': return seq('_.KeyedSet', anglebrackets(
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renderType(t.type),
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'_embedded'));
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case 'dictionary': return seq('_.KeyedDictionary', anglebrackets(
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renderType(t.key),
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renderType(t.value),
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'_embedded'));
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case 'array': return seq('Array', anglebrackets(renderType(t.type)));
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case 'record': return braces(... Array.from(t.fields).map(([nn, tt]) =>
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keyvalue(nn, renderType(tt))));
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default:
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((_: never) => {})(t);
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throw new Error("Unreachable");
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}
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}
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