239 lines
9.5 KiB
TypeScript
239 lines
9.5 KiB
TypeScript
import { FunctionContext } from "./context";
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import * as M from '../meta';
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import { Item, seq } from "./block";
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import { simpleType, typeFor } from "./gentype";
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import { refPosition } from "../reader";
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import { ANY_TYPE, Type } from "./type";
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export function converterForDefinition(
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ctx: FunctionContext,
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p: M.Definition,
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src: string,
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dest: string): Item[]
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{
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switch (p._variant) {
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case 'or': {
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const alts = [p.pattern0, p.pattern1, ... p.patternN];
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function loop(i: number): Item[] {
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ctx.variantName = alts[i].variantLabel;
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return [... converterForPattern(ctx, alts[i].pattern, src, dest),
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... ((i < alts.length - 1)
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? [seq(`if (${dest} === void 0) `, ctx.block(() => loop(i + 1)))]
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: [])];
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}
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return loop(0);
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}
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case 'and': {
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const pcs = [p.pattern0, p.pattern1, ... p.patternN];
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function loop(i: number): Item[] {
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return (i < pcs.length)
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? converterFor(ctx, pcs[i], src, () => loop(i + 1))
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: [ctx.buildCapturedCompound(dest)];
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}
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return loop(0);
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}
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case 'Pattern':
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ctx.variantName = void 0;
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return converterForPattern(ctx, p.value, src, dest);
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}
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}
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function converterForPattern(
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ctx: FunctionContext,
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p: M.Pattern,
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src: string,
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dest: string): Item[]
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{
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return converterFor(ctx, M.NamedPattern.anonymous(p), src, simpleValue => {
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if (simpleValue === void 0) {
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return [ctx.buildCapturedCompound(dest)];
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} else if (ctx.variantName !== void 0) {
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if (typeFor(ctx.mod.resolver(), p).kind === 'unit') {
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return [ctx.buildCapturedCompound(dest)];
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} else {
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return [ctx.withCapture('value',
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simpleValue,
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() => ctx.buildCapturedCompound(dest))];
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}
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} else {
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return [`${dest} = ${simpleValue}`];
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}
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});
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}
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function converterForTuple(ctx: FunctionContext,
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ps: M.NamedPattern[],
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src: string,
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knownArray: boolean,
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variablePattern: M.NamedSimplePattern | undefined,
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k: () => Item[]): Item[]
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{
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function loop(i: number): Item[] {
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if (i < ps.length) {
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return converterFor(ctx, ps[i], `${src}[${i}]`, () => loop(i + 1));
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} else {
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if (variablePattern === void 0) {
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return k();
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} else {
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const vN = ctx.gentemp(Type.array(ANY_TYPE));
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return [ps.length > 0 ? `${vN} = ${src}.slice(${ps.length})` : `${vN} = ${src}`,
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... converterFor(ctx, M.promoteNamedSimplePattern(variablePattern), vN, k, true)];
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}
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}
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}
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const lengthCheck = variablePattern === void 0
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? seq(` && ${src}.length === ${ps.length}`)
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: ((ps.length === 0) ? '' : seq(` && ${src}.length >= ${ps.length}`));
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return knownArray
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? loop(0)
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: [seq(`if (_.Array.isArray(${src})`, lengthCheck, `) `, ctx.block(() => loop(0)))];
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}
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function converterFor(
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ctx: FunctionContext,
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np: M.NamedPattern,
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src: string,
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ks: (dest: string | undefined) => Item[],
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knownArray = false): Item[]
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{
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let p = M.unnamePattern(np);
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let maybeName = M.nameFor(np);
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if (p._variant === 'SimplePattern') {
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const dest = ctx.gentemp(simpleType(ctx.mod.resolver(), p.value));
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return [... converterForSimple(ctx, p.value, src, dest, knownArray),
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ctx.convertCapture(maybeName, dest, () => ks(dest))];
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} else {
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return converterForCompound(ctx, p.value, src, knownArray, () => ks(void 0));
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}
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}
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export function converterForSimple(
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ctx: FunctionContext,
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p: M.SimplePattern,
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src: string,
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dest: string,
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knownArray: boolean): Item[]
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{
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switch (p._variant) {
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case 'any':
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return [`${dest} = ${src}`];
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case 'atom': {
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let test: Item;
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let valexp: Item = `${src}`;
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switch (p.atomKind._variant) {
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case 'Boolean': test = `typeof ${src} === 'boolean'`; break;
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case 'Float': test = `_.Float.isSingle(${src})`; valexp = `${src}.value`; break;
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case 'Double': test =`_.Float.isDouble(${src})`; valexp = `${src}.value`; break;
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case 'SignedInteger': test = `typeof ${src} === 'number'`; break;
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case 'String': test = `typeof ${src} === 'string'`; break;
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case 'ByteString': test = `_.Bytes.isBytes(${src})`; break;
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case 'Symbol': test = `typeof ${src} === 'symbol'`; break;
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}
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return [seq(`${dest} = `, test, ` ? `, valexp, ` : void 0`)];
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}
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case 'embedded':
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return [`${dest} = _.isEmbedded<_embedded>(${src}) ? ${src}.embeddedValue : void 0`];
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case 'lit':
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return [`${dest} = _.is(${src}, ${ctx.mod.literal(p.value)}) ? null : void 0`];
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case 'seqof': {
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const kKnownArray = () => {
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const v = ctx.gentempname();
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return [
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seq(`${dest} = []`),
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seq(`for (const ${v} of ${src}) `, ctx.block(() => [
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... converterFor(ctx, M.anonymousSimplePattern(p.pattern), v, vv =>
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[`${dest}.push(${vv})`, `continue`]),
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seq(`${dest} = void 0`),
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seq(`break`)]))];
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};
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if (knownArray) {
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return kKnownArray();
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} else {
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return [`${dest} = void 0`,
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seq(`if (_.Array.isArray(${src})) `, ctx.block(kKnownArray))];
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}
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}
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case 'setof':
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return [`${dest} = void 0`,
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seq(`if (_.Set.isSet<_embedded>(${src})) `, ctx.block(() => {
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const v = ctx.gentempname();
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return [
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seq(`${dest} = new _.KeyedSet()`),
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seq(`for (const ${v} of ${src}) `, ctx.block(() => [
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... converterFor(ctx, M.anonymousSimplePattern(p.pattern), v, vv =>
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[`${dest}.add(${vv})`, `continue`]),
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seq(`${dest} = void 0`),
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seq(`break`)]))];
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}))];
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case 'dictof':
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return [`${dest} = void 0`,
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seq(`if (_.Dictionary.isDictionary<_embedded>(${src})) `, ctx.block(() => {
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const v = ctx.gentempname();
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const k = ctx.gentempname();
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return [
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seq(`${dest} = new _.KeyedDictionary()`),
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seq(`for (const [${k}, ${v}] of ${src}) `, ctx.block(() => [
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... converterFor(ctx, M.anonymousSimplePattern(p.key), k, kk =>
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converterFor(ctx, M.anonymousSimplePattern(p.value), v, vv =>
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[`${dest}.set(${kk}, ${vv})`, `continue`])),
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seq(`${dest} = void 0`),
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seq(`break`)]))];
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}))];
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case 'Ref':
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return M.lookup(refPosition(p.value), p.value, ctx.mod.env,
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(_p) => [`${dest} = to${p.value.name.description!}(${src})`],
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(modId, modPath,_p) => {
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ctx.mod.imports.add([modId, modPath]);
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return [`${dest} = ${modId}.to${p.value.name.description!}(${src})`];
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});
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default:
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((_p: never) => {})(p);
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throw new Error("Unreachable");
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}
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}
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function converterForCompound(
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ctx: FunctionContext,
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p: M.CompoundPattern,
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src: string,
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knownArray: boolean,
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ks: () => Item[]): Item[]
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{
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switch (p._variant) {
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case 'rec':
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return [seq(`if (_.Record.isRecord<_val, _.Tuple<_val>, _embedded>(${src})) `, ctx.block(() =>
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converterFor(ctx, p.label, `${src}.label`, () =>
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converterFor(ctx, p.fields, src, ks, true))))];
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case 'tuple':
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return converterForTuple(ctx, p.patterns, src, knownArray, void 0, ks);
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case 'tuplePrefix':
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return converterForTuple(ctx, p.fixed, src, knownArray, p.variable, ks);
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case 'dict': {
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const entries = Array.from(p.entries);
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function loop(i: number): Item[] {
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if (i < entries.length) {
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const [k, n] = entries[i];
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const tmpSrc = ctx.gentemp();
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return [seq(`if ((${tmpSrc} = ${src}.get(${ctx.mod.literal(k)})) !== void 0) `,
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ctx.block(() =>
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converterFor(
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ctx,
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M.promoteNamedSimplePattern(n),
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tmpSrc,
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() => loop(i + 1))))];
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} else {
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return ks();
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}
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}
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return [seq(`if (_.Dictionary.isDictionary<_embedded>(${src})) `, ctx.block(() => loop(0)))];
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}
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default:
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((_p: never) => {})(p);
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throw new Error("Unreachable");
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}
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}
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