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PerryvwPerryvw
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generate lualib with plugins
1 parent a434ab2 commit 7c353f1

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5 files changed

+140
-9
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5 files changed

+140
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lines changed

‎src/lualib-build/plugin.ts‎

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import { SourceNode } from "source-map";
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import * as ts from "typescript";
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import * as tstl from "..";
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function lualibFileVisitor(file: ts.SourceFile, context: tstl.TransformationContext): tstl.File {
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// Get all imports in file
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const imports = file.statements.filter(ts.isImportDeclaration);
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const importNames = new Set<string>();
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for (const { importClause } of imports) {
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if (importClause?.namedBindings && ts.isNamedImports(importClause.namedBindings)) {
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for (const { name } of importClause.namedBindings.elements) {
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importNames.add(name.text);
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}
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}
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}
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// Transpile file as normal with tstl
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const fileResult = context.superTransformNode(file)[0] as tstl.File;
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// Find all exports assignments
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const exportInitializers = new Map<string, tstl.Expression>();
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for (const s of fileResult.statements) {
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if (tstl.isAssignmentStatement(s) && isExportTableIndex(s.left[0])) {
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exportInitializers.set(s.left[0].index.value, s.right[0]);
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}
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}
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// Replace export aliases with initializers
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for (let i = 0; i < fileResult.statements.length; i++) {
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const statement = fileResult.statements[i];
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if (isExportAlias(statement)) {
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const name = statement.left[0];
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fileResult.statements[i] = tstl.createAssignmentStatement(name, exportInitializers.get(name.text));
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}
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}
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// Filter out import/export statements
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const shouldIgnoreImportsExports = (node: tstl.Node) =>
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!isExportTableDeclaration(node) &&
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!isRequire(node) &&
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!isImport(node, importNames) &&
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!isExportAssignment(node) &&
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!isExportsReturn(node);
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const filteredStatements = fileResult.statements.filter(shouldIgnoreImportsExports);
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if (filteredStatements.length > 0) {
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// If there are local statements, wrap them in a do ... end with exports outside
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const exports = tstl.createVariableDeclarationStatement([...exportInitializers.keys()].map(k => tstl.createIdentifier(k)));
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fileResult.statements = [exports, tstl.createDoStatement(filteredStatements)];
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} else {
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const newStatements = [];
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for (const [exportName, initializer] of exportInitializers) {
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newStatements.push(tstl.createVariableDeclarationStatement(tstl.createIdentifier(exportName), initializer));
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}
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fileResult.statements = newStatements;
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}
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return fileResult;
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}
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class LuaLibPrinter extends tstl.LuaPrinter {
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// Strip all exports during print
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public printTableIndexExpression(expression: tstl.TableIndexExpression): SourceNode {
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if (tstl.isIdentifier(expression.table) && expression.table.text === "____exports" && tstl.isStringLiteral(expression.index)) {
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return super.printExpression(tstl.createIdentifier(expression.index.value));
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}
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return super.printTableIndexExpression(expression);
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}
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}
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const plugin: tstl.Plugin = {
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visitors: {
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[ts.SyntaxKind.SourceFile]: lualibFileVisitor,
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},
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printer: (program, emitHost, fileName, file) => new LuaLibPrinter(emitHost, program, fileName).print(file),
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};
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// eslint-disable-next-line import/no-default-export
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export default plugin;
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function isExportTableDeclaration(node: tstl.Node): node is tstl.VariableDeclarationStatement & { left: [] } {
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return tstl.isVariableDeclarationStatement(node) && isExportTable(node.left[0]);
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}
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function isExportTable(node: tstl.Node): node is tstl.Identifier {
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return tstl.isIdentifier(node) && node.text === "____exports";
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}
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function isExportTableIndex(node: tstl.Node): node is tstl.TableIndexExpression & { index: tstl.StringLiteral } {
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return tstl.isTableIndexExpression(node) && isExportTable(node.table) && tstl.isStringLiteral(node.index);
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}
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function isExportAlias(node: tstl.Node): node is tstl.VariableDeclarationStatement {
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return tstl.isVariableDeclarationStatement(node) && node.right !== undefined && isExportTableIndex(node.right[0]);
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}
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function isExportAssignment(node: tstl.Node) {
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return tstl.isAssignmentStatement(node) && isExportTableIndex(node.left[0]);
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}
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function isRequire(node: tstl.Node) {
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return (
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tstl.isVariableDeclarationStatement(node) &&
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node.right &&
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tstl.isCallExpression(node.right[0]) &&
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tstl.isIdentifier(node.right[0].expression) &&
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node.right[0].expression.text === "require"
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);
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}
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function isImport(node: tstl.Node, importNames: Set<string>) {
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return tstl.isVariableDeclarationStatement(node) && importNames.has(node.left[0].text);
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}
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function isExportsReturn(node: tstl.Node) {
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return (
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tstl.isReturnStatement(node) &&
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tstl.isIdentifier(node.expressions[0]) &&
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node.expressions[0].text === "____exports"
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);
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}

‎src/lualib/Promise.ts‎

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@@ -1,14 +1,10 @@
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/* eslint-disable @typescript-eslint/promise-function-async */
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import { __TS__PromiseState } from "./PromiseState";
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// Promises implemented based on https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise
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// and https://promisesaplus.com/
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enum __TS__PromiseState {
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Pending,
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Fulfilled,
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Rejected,
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}
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type FulfillCallback<TData, TResult> = (value: TData) => TResult | PromiseLike<TResult>;
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type RejectCallback<TResult> = (reason: any) => TResult | PromiseLike<TResult>;
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@@ -27,7 +23,7 @@ function __TS__IsPromiseLike<T>(thing: unknown): thing is PromiseLike<T> {
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return thing instanceof __TS__Promise;
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}
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class __TS__Promise<T> implements Promise<T> {
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export class __TS__Promise<T> implements Promise<T> {
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public state = __TS__PromiseState.Pending;
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public value?: T;
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public rejectionReason?: any;

‎src/lualib/PromiseAll.ts‎

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// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/all
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import { __TS__Promise } from "./Promise";
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import { __TS__PromiseState } from "./PromiseState";
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// eslint-disable-next-line @typescript-eslint/promise-function-async
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function __TS__PromiseAll<T>(this: void, iterable: Iterable<T | PromiseLike<T>>): Promise<T[]> {
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export function __TS__PromiseAll<T>(this: void, iterable: Iterable<T | PromiseLike<T>>): Promise<T[]> {
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const results: T[] = [];
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const toResolve = new LuaTable<number, PromiseLike<T>>();

‎src/lualib/PromiseState.ts‎

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export enum __TS__PromiseState {
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Pending,
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Fulfilled,
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Rejected,
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}

‎src/lualib/tsconfig.json‎

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},
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"tstl": {
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"luaLibImport": "none",
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"noHeader": true
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"noHeader": true,
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"luaPlugins": [
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{ "name": "../lualib-build/plugin.ts" }
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]
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}
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}

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