capnpc-ts/test/unit/ast-creators.spec.ts

Cap'n Proto schema compiler for TypeScript.

import tap from "tap";

import { readFileBuffer } from "../util";
import * as capnp from "capnp-ts";
import * as Schema from "capnp-ts/src/std/schema.capnp.js";
import { createValueExpression } from "../../src/ast-creators";
import ts from "typescript";

const TEST_REQUEST = readFileBuffer("test/data/test-request.bin");

void tap.test("createValueExpression", (t) => {
  const m = new capnp.Message(TEST_REQUEST, false);

  // Find a node with a default pointer value to play around with.
  const node = m
    .getRoot(Schema.CodeGeneratorRequest)
    .getNodes()
    .find((n) => n.getDisplayName().split(":")[1] === "TestDefaults");

  if (node === undefined) {
    t.fail();
    return;
  }

  const value = node.getStruct().getFields().get(29).getSlot().getDefaultValue();
  const printer = ts.createPrinter();
  const sourceFile = ts.createSourceFile("", "", ts.ScriptTarget.ES2017);

  t.equal(
    printer.printNode(ts.EmitHint.Expression, createValueExpression(value), sourceFile),
    "capnp.readRawPointer(new Uint8Array([0x10, 0x07, 0x11, 0x01, 0x1e, 0x11, 0x09, 0x32, 0x11, 0x09, 0x32, " +
      "0x11, 0x09, 0x2a, 0x1f, 0x70, 0x6c, 0x75, 0x67, 0x68, 0x1f, 0x78, 0x79, 0x7a, 0x7a, 0x79, 0x0f, 0x74, 0x68, " +
      "0x75, 0x64]).buffer)"
  );

  t.end();
});