Rewrote backend in c++
This commit is contained in:
306
old_backend/tools/apigen.ts
Normal file
306
old_backend/tools/apigen.ts
Normal file
@@ -0,0 +1,306 @@
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import {
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AST_NODE_TYPES,
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createProgram,
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parse
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} from '@typescript-eslint/typescript-estree';
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import * as fs from 'fs';
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import * as path from 'path';
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import * as a from '@typescript-eslint/types/dist/generated/ast-spec';
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import { TypeNode } from '@typescript-eslint/types/dist/generated/ast-spec';
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import { Writable } from 'stream';
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class Err extends Error {
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constructor(o: object) {
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super();
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console.error(o);
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}
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}
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const program = createProgram('tsconfig.json');
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class BetterWritable {
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constructor(private w: Writable) {}
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private indent = 0;
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write(data: string) {
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this.w.write('\t'.repeat(this.indent));
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this.w.write(data);
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this.w.write('\n');
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}
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writeInc(data: string) {
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this.write(data);
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this.indent++;
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}
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writeDec(data: string) {
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this.indent--;
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this.write(data);
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}
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writeDecInc(data: string) {
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this.indent--;
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this.write(data);
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this.indent++;
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}
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}
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interface Outputable {
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write(s: BetterWritable);
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writeJsonAs(ns: string, s: BetterWritable);
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}
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class CppProp {
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constructor(entry: string) {
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this.entry = entry;
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}
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entry: string;
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}
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// template <> inline dto::Requests::Auth::LoginRequest Json::Value::as<dto::Requests::Auth::LoginRequest>() const { return asFloat(); }
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class CppClass implements Outputable {
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constructor(name: string) {
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this.name = name;
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}
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type = 'class' as const;
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name: string;
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sub: string[] = [];
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entries: CppProp[] = [];
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write(s: BetterWritable) {
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let name = `struct ${this.name}`;
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if (this.sub.length > 0)
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name += ' : public ' + this.sub.join(', public ');
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s.writeInc(`${name} {`);
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if (this.sub.length == 0) {
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s.write(`${this.name}() = default;`);
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s.writeInc(`explicit ${this.name}(const Json::Value& j) {`);
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} else {
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s.writeInc(`${this.name}() :`);
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this.sub.forEach((sub) => {
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s.write(`${sub}()`);
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});
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s.writeDec('{}');
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s.writeInc(`explicit ${this.name}(const Json::Value& j) :`);
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this.sub.forEach((sub) => {
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s.write(`${sub}(j)`);
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});
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s.writeDecInc('{');
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}
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this.entries.forEach((e) => {
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const [type, name] = e.entry.split(' ');
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const opt_match = /std::optional<([a-z:<>]+)>/.exec(type);
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if (opt_match !== null)
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s.write(
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`this->${name} = json_get_optional<${opt_match[1]}>(j, "${name}");`
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);
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else s.write(`this->${name} = j["${name}"].as<${type}>();`);
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});
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s.writeDec('}');
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this.entries.forEach((e) => s.write(`${e.entry};`));
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s.writeDec('};');
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}
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writeJsonAs(ns: string, s: BetterWritable) {
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s.write(
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`template <> inline ${ns}${this.name} Json::Value::as() const { return ${ns}${this.name}(*this); }`
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);
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}
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}
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class CppEnum implements Outputable {
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constructor(name: string) {
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this.name = name;
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}
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type = 'enum' as const;
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name: string;
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entries: CppProp[] = [];
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write(s: BetterWritable) {
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return;
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s.writeInc(`enum ${this.name} : int {`);
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this.entries.forEach((e, idx, arr) =>
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s.write(`${e.entry}${idx === arr.length - 1 ? '' : ','}`)
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);
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s.writeDec('};');
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}
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writeJsonAs(ns: string, s: BetterWritable) {
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return;
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s.write(
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`template <> inline ${ns}${this.name} Json::Value::as() const { return (${ns}${this.name})(asInt()); }`
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);
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}
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}
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class CppNamespace implements Outputable {
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constructor(name: string) {
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this.name = name;
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}
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type = 'ns' as const;
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name: string;
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body: (CppNamespace | CppClass | CppEnum)[] = [];
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write(s: BetterWritable) {
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s.writeInc(`namespace ${this.name} {`);
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this.body.forEach((b) => b.write(s));
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s.writeDec('}');
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}
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writeJsonAs(ns: string, s: BetterWritable) {
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ns += `${this.name}::`;
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this.body.forEach((b) => b.writeJsonAs(ns, s));
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}
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}
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function _getCppType(
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t: TypeNode
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): null | string | ((opt: boolean, name: string) => string) {
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switch (t.type) {
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case AST_NODE_TYPES.TSStringKeyword:
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return 'std::string';
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case AST_NODE_TYPES.TSBooleanKeyword:
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return 'bool';
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case AST_NODE_TYPES.TSNumberKeyword:
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return 'int';
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case AST_NODE_TYPES.TSTypeReference:
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if (t.typeName.type != AST_NODE_TYPES.Identifier) throw new Err(t);
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return t.typeName.name;
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case AST_NODE_TYPES.TSLiteralType:
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return null;
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case AST_NODE_TYPES.TSUnionType:
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return _getCppType(t.types[0]);
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case AST_NODE_TYPES.TSArrayType:
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return `std::vector<${_getCppType(t.elementType)}>`;
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default:
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throw new Err(t);
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}
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}
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function getCppType(opt: boolean, name: string, t: TypeNode): null | string {
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let ret = _getCppType(t);
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if (typeof ret === 'function') return `${ret(opt, name)}`;
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if (typeof ret === 'string') {
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if (opt) ret = `std::optional<${ret}>`;
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return `${ret} ${name}`;
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} else return ret;
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}
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function handleClassProperty(
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prop: a.PropertyDefinitionComputedName | a.PropertyDefinitionNonComputedName
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): CppProp | null {
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if (prop.key.type != AST_NODE_TYPES.Identifier) throw new Err(prop);
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if (!prop.typeAnnotation) throw new Err(prop);
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const type = getCppType(
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prop.optional && prop.optional,
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prop.key.name,
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prop.typeAnnotation.typeAnnotation
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);
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return type === null ? null : new CppProp(type);
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}
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function handleClass(
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dec: a.ClassDeclarationWithName | a.ClassDeclarationWithOptionalName
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): CppClass {
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if (!dec.id) throw new Err(dec);
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const cls = new CppClass(dec.id.name);
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if (dec.superClass) {
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const subCls = dec.superClass;
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if (subCls.type == AST_NODE_TYPES.Identifier) cls.sub.push(subCls.name);
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else throw new Err(subCls);
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}
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dec.body.body.forEach((inner) => {
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if (inner.type == AST_NODE_TYPES.PropertyDefinition) {
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const prop = handleClassProperty(inner);
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if (prop) cls.entries.push(prop);
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} else if (
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inner.type == AST_NODE_TYPES.MethodDefinition &&
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inner.key.type == AST_NODE_TYPES.Identifier &&
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inner.key.name === 'constructor'
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)
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return;
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else throw new Err(inner);
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});
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return cls;
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}
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function handleEnum(dec: a.TSEnumDeclaration): CppEnum {
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const enm = new CppEnum(dec.id.name);
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dec.members.forEach((member) => {
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if (
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member.id.type == AST_NODE_TYPES.Identifier &&
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member.initializer.type == AST_NODE_TYPES.Literal
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) {
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enm.entries.push(
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new CppProp(`${member.id.name} = ${member.initializer.raw}`)
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);
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} else throw new Err(member);
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});
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return enm;
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}
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function handleNamedDeclaration(
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dec: a.ExportNamedDeclaration
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): CppClass | CppEnum | undefined {
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if (!dec.declaration) throw new Err(dec);
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else if (dec.declaration.type == AST_NODE_TYPES.ClassDeclaration)
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return handleClass(dec.declaration);
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else if (dec.declaration.type == AST_NODE_TYPES.TSEnumDeclaration)
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return handleEnum(dec.declaration);
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else if (dec.declaration.type == AST_NODE_TYPES.FunctionDeclaration) return;
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else {
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throw new Err(dec);
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}
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}
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function handleExport(
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ns: CppNamespace,
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file: string,
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body: a.ExportNamedDeclaration | a.ExportAllDeclaration
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) {
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let newPath = path.join(path.dirname(file), body.source.value);
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if (fs.existsSync(newPath) && fs.statSync(newPath).isDirectory())
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newPath = path.join(newPath, 'index.ts');
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else if (!newPath.endsWith('.ts')) newPath = newPath + '.ts';
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console.log(`${file}: ${newPath}`);
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parseFile(ns, newPath);
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}
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function parseFile(ns: CppNamespace, file: string) {
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const ast = parse(fs.readFileSync(file).toString(), {
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programs: [program]
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});
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ast.body
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.filter((body) => body.type == AST_NODE_TYPES.ExportNamedDeclaration)
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.forEach((body: a.ExportNamedDeclaration) => {
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if (!body.source) {
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const ret = handleNamedDeclaration(body);
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if (ret) ns.body.push(ret);
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} else handleExport(ns, file, body);
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});
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ast.body
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.filter((body) => body.type == AST_NODE_TYPES.ExportAllDeclaration)
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.forEach((body: a.ExportAllDeclaration) => {
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let usedNs = ns;
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if ('exported' in body && body.exported) {
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const newNs = new CppNamespace(body.exported.name);
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ns.body.push(newNs);
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usedNs = newNs;
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}
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handleExport(usedNs, file, body);
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});
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}
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const globalNamespace = new CppNamespace('dto');
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parseFile(globalNamespace, '../dto/index.ts');
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const output_stream = fs.createWriteStream('../backend/src/dto.h');
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output_stream.write(
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'#pragma once\n\n' +
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'#include <string>\n' +
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'#include <optional>\n' +
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'#include <vector>\n' +
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'#include <json/allocator.h>\n' +
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'#include "dto_extras.h"\n\n'
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);
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const output = new BetterWritable(output_stream);
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globalNamespace.write(output);
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globalNamespace.writeJsonAs('', output);
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