299 lines
13 KiB
TypeScript
299 lines
13 KiB
TypeScript
import { Pattern, NamedPattern, Schema, Input, Environment, Ref, lookup } from "./meta";
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import * as M from './meta';
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import { Annotated, Bytes, Dictionary, Fold, fold, KeyedSet, Position, preserves, Record, Set, Tuple, Value } from "@preserves/core";
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import { Formatter, parens, seq, Item, opseq, block, commas, brackets, anglebrackets, braces } from "./block";
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import { refPosition } from "./reader";
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export interface CompilerOptions {
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preservesModule?: string;
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defaultPointer?: Ref;
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warn?(message: string, pos: Position | null): void;
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};
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function fnblock(... items: Item[]): Item {
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return seq('((() => ', block(... items), ')())');
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}
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export function compile(env: Environment, schema: Schema, options: CompilerOptions = {}): string {
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const literals = new Dictionary<string, never>();
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const types: Array<Item> = [];
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const functions: Array<Item> = [];
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const imports = new KeyedSet<[string, string]>();
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let temps: Array<string> = [];
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const pointerName = Schema._.details(schema).get(M.$pointer);
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function applyPredicate(name: Ref, v: string): Item {
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return lookup(refPosition(name), name, env,
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(_p) => `is${Ref._.name(name).description!}(${v})`,
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(p) => walk(v, p),
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(mod, modPath, _p) => {
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imports.add([mod, modPath]);
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return `${mod}.is${Ref._.name(name).description!}(${v})`;
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});
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}
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function gentemp(): string {
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const varname = '_tmp' + temps.length;
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temps.push(varname);
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return varname;
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}
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function literal(v: Input): Item {
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let varname = literals.get(v);
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if (varname === void 0) {
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const s = v.asPreservesText()
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.replace('_', '__')
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.replace('*', '_STAR_');
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varname = M.isValidToken('_' + s, true) ? '$' + s : '__lit' + literals.size;
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literals.set(v, varname);
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}
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return varname;
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}
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function typeFor(p: Pattern): Item {
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switch (p.label) {
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case M.$atom:
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switch (p[0]) {
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case M.$Boolean: return `boolean`;
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case M.$Float: return `_.SingleFloat`;
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case M.$Double: return `_.DoubleFloat`;
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case M.$SignedInteger: return `number`;
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case M.$String: return `string`;
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case M.$ByteString: return `_.Bytes`;
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case M.$Symbol: return `symbol`;
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}
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case M.$lit:
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return `(typeof ${literal(p[0])})`;
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case M.$ref:
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return lookup(refPosition(p), p, env,
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(_p) => p[1].description!,
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(p) => typeFor(p),
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(mod, modPath,_p) => {
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imports.add([mod, modPath]);
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return `${mod}.${p[1].description!}`;
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});
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case M.$or:
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return opseq('never', ' | ', ... p[0].map(pp => typeFor(pp)));
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case M.$and:
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return opseq('_val', ' & ', ... p[0].map(pp => typeFor(pp)));
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case M.$pointer:
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return `_ptr`;
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case M.$rec:
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return seq('_.Record', anglebrackets(typeFor(p[0]), typeFor(p[1]), '_ptr'));
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case M.$tuple:
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return brackets(... p[0].map(pp => typeFor(unname(pp))));
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case M.$tuple_STAR_:
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if (p[0].length === 0) {
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return seq('Array<', typeFor(unname(p[1])), '>');
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} else {
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return brackets(... p[0].map(pp => typeFor(unname(pp))),
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seq('... Array<', typeFor(unname(p[1])), '>'));
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}
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case M.$setof:
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return seq('_.KeyedSet<', typeFor(p[0]), '>');
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case M.$dictof:
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return seq('_.KeyedDictionary', anglebrackets(typeFor(p[0]), typeFor(p[1])));
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case M.$dict:
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return parens(seq(
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block(
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... Array.from(p[0]).map(([k, vp]) =>
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seq(`get(k: typeof ${literal(k)}): `, typeFor(vp))),
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... Array.from(p[0]).map(([k, _vp]) =>
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seq(`has(k: typeof ${literal(k)}): true`))),
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' & _.Dictionary<_val, _ptr>'));
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default:
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((_p: never) => {})(p);
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throw new Error("Unreachable");
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}
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}
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function walk(v: string, p: Pattern, recordOkAsTuple = false): Item {
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switch (p.label) {
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case M.$atom:
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switch (p[0]) {
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case M.$Boolean: return `typeof ${v} === 'boolean'`;
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case M.$Float: return `_.Float.isSingle(${v})`;
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case M.$Double: return `_.Float.isDouble(${v})`;
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case M.$SignedInteger: return `typeof ${v} === 'number'`;
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case M.$String: return `typeof ${v} === 'string'`;
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case M.$ByteString: return `_.Bytes.isBytes(${v})`;
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case M.$Symbol: return `typeof ${v} === 'symbol'`;
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}
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case M.$lit:
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return `_.is(${v}, ${literal(p[0])})`;
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case M.$ref:
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return applyPredicate(p, v);
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case M.$or:
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return opseq('false', ' || ', ... p[0].map(pp => walk(v, pp)));
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case M.$and:
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return opseq('true', ' && ', ... p[0].map(pp => walk(v, pp)));
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case M.$pointer:
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return `_.isPointer(${v})`;
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case M.$rec:
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return opseq('true', ' && ',
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`_.Record.isRecord<_val, _.Tuple<_val>, _ptr>(${v})`,
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walk(`${v}.label`, p[0]),
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walk(v, p[1], true));
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case M.$tuple:
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return opseq('true', ' && ',
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... (recordOkAsTuple ? []
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: [`_.Array.isArray(${v})`, `!_.Record.isRecord<_val, _.Tuple<_val>, _ptr>(${v})`]),
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`(${v}.length === ${p[0].length})`,
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... p[0].map((pp, i) => walk(`${v}[${i}]`, unname(pp))));
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case M.$tuple_STAR_:
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return opseq('true', ' && ',
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... (recordOkAsTuple ? []
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: [`_.Array.isArray(${v})`, `!_.Record.isRecord<_val, _.Tuple<_val>, _ptr>(${v})`]),
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`(${v}.length >= ${p[0].length})`,
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seq(`${v}.slice(${p[0].length})`,
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`.every(v => `,
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parens(walk('v', unname(p[1]))),
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`)`),
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... p[0].map((pp, i) => walk(`${v}[${i}]`, unname(pp))));
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case M.$setof:
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return opseq('true', ' && ',
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`_.Set.isSet<_val>(${v})`,
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fnblock(
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seq(`for (const vv of ${v}) `, block(
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seq('if (!(', walk('vv', p[0]), ')) return false'))),
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seq('return true')));
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case M.$dictof:
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return opseq('true', ' && ',
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`_.Dictionary.isDictionary<_val, _ptr>(${v})`,
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fnblock(
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seq(`for (const e of ${v}) `, block(
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seq('if (!(', walk('e[0]', p[0]), ')) return false'),
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seq('if (!(', walk('e[1]', p[1]), ')) return false'))),
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seq('return true')));
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case M.$dict:
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return opseq('true', ' && ',
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`_.Dictionary.isDictionary<_val, _ptr>(${v})`,
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... Array.from(p[0]).map(([k, vp]) => {
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const tmp = gentemp();
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return parens(seq(
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`(${tmp} = ${v}.get(${literal(k)})) !== void 0 && `,
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walk(tmp, vp)));
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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 unname(p: NamedPattern): Pattern {
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return (p.label === M.$named) ? p[1] : p;
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}
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function fieldName(np: NamedPattern, index: number): string {
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return (np.label === M.$named) ? np[0].description! : `_field${index}`;
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}
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function fieldEntry(np: NamedPattern, index: number): Item {
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return seq(JSON.stringify(fieldName(np, index)), ': ', typeFor(unname(np)));
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}
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for (const [name0, pattern] of Schema._.details(schema).get(M.$definitions)) {
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const name = name0 as symbol;
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temps = [];
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const recognizer = walk('v', pattern);
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if (pattern.label === M.$rec &&
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pattern[0].label === M.$lit &&
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pattern[1].label === M.$tuple)
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{
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types.push(
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seq(`export const ${name.description!} = _.Record.makeConstructor<`,
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braces(... pattern[1][0].map(fieldEntry)),
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`, _ptr>()(${literal(pattern[0][0])}, `,
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JSON.stringify(pattern[1][0].map(fieldName)), `);`));
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}
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types.push(
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seq(`export type ${name.description!} = `, typeFor(pattern), `;`));
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functions.push(
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seq('export function ', `is${name.description!}`,
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'(v: any): v is ', name.description!, ' ',
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block(
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... temps.length > 0 ? [seq('let ', commas(... temps), ': any')] : [],
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seq('return ', recognizer))));
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functions.push(
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seq('export function ', `as${name.description!}`,
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'(v: any): ', name.description!, ' ',
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block(
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seq(`if (!is${name.description!}(v)) `,
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block(`throw new TypeError(\`Invalid ${name.description!}: \${_.stringify(v)}\`)`),
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' else ',
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block(`return v`)))));
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}
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types.push(seq('export type _ptr = ', pointerName === false ? 'never' : typeFor(pointerName), `;`));
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types.push(`export type _val = _.Value<_ptr>;`);
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const f = new Formatter();
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f.write(`import * as _ from ${JSON.stringify(options.preservesModule ?? '@preserves/core')};\n`);
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imports.forEach(([identifier, path]) => {
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f.write(`import * as ${identifier} from ${JSON.stringify(path)};\n`);
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});
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f.newline();
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const sortedLiterals = Array.from(literals);
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sortedLiterals.sort((a, b) => a[1] < b[1] ? -1 : a[1] === b[1] ? 0 : 1);
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for (const [lit, varname] of sortedLiterals) {
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f.write(seq(`export const ${varname} = `, sourceCodeFor(lit), `;\n`));
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}
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f.newline();
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types.forEach(t => {
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f.write(t);
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f.newline();
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f.newline();
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});
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f.newline();
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functions.forEach(p => {
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f.write(p);
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f.newline();
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f.newline();
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});
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return f.toString();
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}
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export function stringSource(s: string) {
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return JSON.stringify(s);
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}
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export function sourceCodeFor(v: Value<any>): Item {
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return fold(v, {
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boolean(b: boolean): Item { return b.toString(); },
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single(f: number): Item { return f.toString(); },
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double(f: number): Item { return f.toString(); },
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integer(i: number): Item { return i.toString(); },
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string(s: string): Item { return stringSource(s); },
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bytes(b: Bytes): Item {
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return seq(`Uint8Array.from(`, brackets(... Array.from(b).map(b => b.toString())), `)`);
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},
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symbol(s: symbol): Item { return `Symbol.for(${stringSource(s.description!)})`; },
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record(r: Record<Value<any>, Tuple<Value<any>>, any>, k: Fold<any, Item>): Item {
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return seq(`_.Record<_val, _.Tuple<_val>, _ptr>`, parens(k(r.label), brackets(... r.map(k))));
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},
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array(a: Array<Value<any>>, k: Fold<any, Item>): Item {
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return brackets(... a.map(k));
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},
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set(s: Set<any>, k: Fold<any, Item>): Item {
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return seq('new _.Set<_val>', parens(brackets(... Array.from(s).map(k))));
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},
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dictionary(d: Dictionary<Value<any>, any>, k: Fold<any, Item>): Item {
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return seq('new _.Dictionary<_val, _ptr>', parens(brackets(... Array.from(d).map(([kk,vv]) =>
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brackets(k(kk), k(vv))))));
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},
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annotated(a: Annotated<any>, k: Fold<any, Item>): Item {
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return seq('_.annotate<_ptr>', parens(k(a.item), ... a.annotations.map(k)));
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},
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pointer(t: any, _k: Fold<any, Item>): Item {
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throw new Error(preserves`Cannot emit source code for construction of pointer ${t}`);
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},
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});
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}
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