antlr-grun-web

Display parse tree visually in web browser just like Antlr grun.Online Demo.

Usually we use Antlr grun to display a parse tree. But when I try to implements a web editor with SQL formmating function, I found the following drawbacks:

• I've already generated the JS runtime code for my Lexer and Parser used in my web editor, but grun only supports the Java version. So I have to regenerate runtime code for Java target.
• It's hard to select a certain treenode which means I have to type the node's name manually when writing its formatting rule.
• I have to rerun grun when I want to display another SQL.

So I try to use some web technologies:

• G6 for displaying the whole parse tree, and using SVG as renderer with some CSS rules, it's really easy to select text in every treenode.
• Antd Input component for typing SQL
• Antlr JS target
• create-umi boilerplate

Since this is a TypeScript project, I use antlr4ts to generate TypeScript target code instead of antlr.

Getting Started

Install dependencies

yarn

Start a dev-server

yarn start

Support other languages

Compiling MySQL grammar using antlr4ts:

yarn antlr4ts

Then add this language in config:

// src/languages/index.ts
import { MySqlLexer } from './mysql/MySqlLexer';
import { MySqlParser } from './mysql/MySqlParser';

const languages: ILanguage[] = [
  {
    /**
     * display name in Select component
     */
    displayName: 'MySQL',
    lexer: MySqlLexer,
    parser: MySqlParser,
    /**
     * entry rule defined in parser
     */
    entry: 'sqlStatement',
  },
];