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generate-api.ts
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generate-api.ts
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import ts from "typescript";
import { describe, params } from "./util";
import { Member, Type, Param } from "./types";
import { Namespaced, NodeWalker, walk } from "./walk";
type Kind = "export" | "module" | "enum" | "class" | "interface" | "alias" | "module" | "variable" | "function";
type Export = {
exported: true,
export: string[],
kind: Extract<Kind, "export">
}
type Named = { name: string, kind: Exclude<Kind, "export"> };
type Generic = Named & { kind: Extract<Kind, "alias" | "module"> };
type EnumDecl = Named & {
members: Member[],
kind: Extract<Kind, "enum">
}
type Var = Named & {
type?: Type,
kind: Extract<Kind, "variable">
}
type ClassLike = Named & {
members: Member[],
heritage?: string[][],
kind: Extract<Kind, "class" | "interface">
}
type Fn = {
name?: string,
question: boolean,
params: Param[],
type: Type,
kind: Extract<Kind, "function">;
}
type Decl = Export | EnumDecl | Var | ClassLike | Fn | Generic;
type KnownDeclaration = ts.FunctionDeclaration
| ts.EnumDeclaration
| ts.ClassDeclaration
| ts.InterfaceDeclaration
| ts.TypeAliasDeclaration
| ts.ModuleDeclaration
| ts.VariableDeclaration
| ts.NamespaceExportDeclaration;
function decl(node: KnownDeclaration, tc: ts.TypeChecker): Decl {
if (ts.isNamespaceExportDeclaration(node))
return {
exported: true,
export: node.name.text.split('.'),
kind: "export"
};
if (ts.isModuleDeclaration(node))
return {
name: node.name.text,
kind: "module"
};
if (ts.isEnumDeclaration(node))
return {
name: node.name.text,
members: describe(node.members),
kind: "enum"
};
if (ts.isVariableDeclaration(node))
return {
name: node.name.getText(),
type: node.type && describe(node.type),
kind: "variable"
};
if (ts.isClassDeclaration(node) || ts.isInterfaceDeclaration(node))
return {
name: node.name!.text,
heritage: node.heritageClauses && describe(node.heritageClauses, tc),
members: ts.isClassDeclaration(node) ?
describe(node.members) :
describe(node.members),
kind: node.kind === ts.SyntaxKind.ClassDeclaration ? "class" : "interface"
};
if (ts.isFunctionDeclaration(node))
return {
name: node.name?.text,
question: !!node.questionToken,
params: params(node),
type: describe(node.type!),
kind: "function"
};
return {
name: node.name.text,
kind: "alias"
};
}
type Decls = Record<string, NSDecl[]>;
type NSDecl = Decl & Namespaced;
const walker: NodeWalker<NSDecl[], NSDecl, Decls> = {
visit(node: any, ns: string[], tc: ts.TypeChecker): NSDecl | null {
return {
namespace: (ts.isModuleDeclaration(node) ?
[...ns, node.name.text] : ns), ...decl(node, tc)
};
},
combine(decls: NSDecl[], update: NSDecl): NSDecl[] {
return [...decls, update];
},
finalize(decls: NSDecl[]): Decls {
return decls.reduce(
(acc, d) => {
const ns = d.namespace.join('.') || '__toplevel__';
return { ...acc, [ns]: [...(acc[ns] || []), d] };
}, {} as Decls)
}
}
const main = (inf: string) => {
const p = ts.createProgram([inf], { target: ts.ScriptTarget.Latest });
const f = p.getSourceFile(inf)!;
const tc = p.getTypeChecker();
console.log(JSON.stringify(walk(f, walker, [], tc)));
}
main("/Users/m/p/jones/cljs/node_modules/llvm-bindings/example.d.ts");