bblfsh

Bblfsh javascript client

• use web grpc to call bblfsh
• use libuast compiled to WASM for uast filtering

Installation

yarn add bblfsh

The WASM module from node_modules/dist/libuast.wasm must be available as /libuast.wasm in a browser.

It's possible to change the public path to the file like this:

const libuast = initLibuast({
  locateFile(path) {
    if(path.endsWith('.wasm')) {
      return '/some/other/path/libuast.wasm';
    }
    return path;
  }
});

Usage

Client

import Client from 'bblfsh';

const client = new Client('<web-grpc-address>');

client.parse(sourceCode, filename, language)
  .then(r => /* gRPC response */)
  .catch(err => /* or error */);

Libuast

import { protoToMap, initLibuast } from 'bblfsh';

const libuast = initLibuast();
const uastMapping = protoToMap(uast);

libuast.filter(nodeId, uastMapping, xpathQuery)
  .then(ids => /* list of nodes */)
  .catch(err => /* or error */);

Full API documentation available here: API.md.

Run examples locally

docker-compose up

The example app will be available on http://127.0.0.1:8444

Please check Dockerfile in the app example directory to run it without docker

Backend dependencies without docker

• run bblfsh server on 9432 port
• run grpc proxy grpcwebproxy --backend_addr=127.0.0.1:9432 --run_tls_server=false

Development:

Requirements:

• nodejs + yarn
• python2.7
• build tools: cmake autoconf libtool automake pkg-config make
• emscripten (v1.38.8+)
• protoc

Commands

• yarn build - build everything
• yarn build:proto - generate js from protobuf files
• yarn build:libs - download & build C dependencies for libuast
• yarn build:wasm- generate WASM & js helper for libuast
• yarn build:bundle - generate library as a bundle with all dependencies included