78 lines
2.9 KiB
TypeScript
78 lines
2.9 KiB
TypeScript
import { SimpleType, Type } from "./type";
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import { anglebrackets, braces, Item, keyvalue, opseq, seq } from "./block";
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import { ModuleContext } from "./context";
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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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function simpleTypeFields(ctxt: ModuleContext, t: SimpleType): Item[] {
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switch (t.kind) {
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case 'unit':
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return [];
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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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return [keyvalue('value', renderType(ctxt, t))];
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case 'record':
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return Array.from(t.fields).map(([nn, tt]) => keyvalue(nn, renderType(ctxt, 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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export function renderVariant(
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ctxt: ModuleContext,
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[variantName, t]: [string, SimpleType],
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): Item {
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let fields = simpleTypeFields(ctxt, t);
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return braces(variantFor(variantName), ... fields);
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}
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export function renderType(ctxt: ModuleContext, 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(entry => renderVariant(ctxt, entry)));
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case 'unit': return braces(... simpleTypeFields(ctxt, t));
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case 'ref':
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if (t.ref === null && t.typeName === '_embedded') {
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return t.typeName;
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} else {
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return seq(t.typeName, ctxt.genericArgsFor(t));
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}
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case 'set': return seq('_.EncodableSet', anglebrackets(
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renderType(ctxt, t.type),
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'_embedded'));
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case 'dictionary': return seq('_.EncodableDictionary', anglebrackets(
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renderType(ctxt, t.key),
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renderType(ctxt, t.value),
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'_embedded'));
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case 'array': return seq('Array', anglebrackets(renderType(ctxt, t.type)));
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case 'record': return braces(... simpleTypeFields(ctxt, t));
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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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export function renderTypeWithConversionMixins(ctxt: ModuleContext, t: Type): Item {
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if (t.kind === 'unit' || t.kind === 'record' || t.kind === 'union') {
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return opseq('any', ' & ',
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renderType(ctxt, t),
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seq('_.Preservable', ctxt.hasEmbedded(t) ? ctxt.genericArgs() : '<any>'),
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seq('_.PreserveWritable', ctxt.hasEmbedded(t) ? ctxt.genericArgs() : '<any>'),
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braces(seq('__as_preserve__',
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ctxt.hasEmbedded(t) ? '' : ctxt.genericParameters(),
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'()',
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': _.Value', ctxt.genericArgs())));
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} else {
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return renderType(ctxt, t);
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}
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}
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