@neo4j-cypher/editor-support/es/util/parse.js

Core functionality to support Cypher integration into editors

import antlr4 from "@neo4j-cypher/antlr4-browser";
import { ReferencesProvider } from "../references/ReferencesProvider";
import * as CypherTypes from "../lang/CypherTypes";
import { CypherParser, CypherLexer } from "@neo4j-cypher/antlr4";
import { ErrorListener } from "../errors/ErrorListener";
import { ReferencesListener } from "../references/ReferencesListener";
export const parse = input => {
  const referencesListener = new ReferencesListener();
  const errorListener = new ErrorListener();
  const chars = new antlr4.InputStream(input);
  const lexer = new CypherLexer(chars);
  lexer.removeErrorListeners();
  lexer.addErrorListener(errorListener);
  const tokens = new antlr4.CommonTokenStream(lexer);
  const parser = new CypherParser(tokens);
  parser.buildParseTrees = true;
  parser.removeErrorListeners();
  parser.addErrorListener(errorListener);
  parser.addParseListener(referencesListener);
  const parseTree = parser.cypher();
  const {
    queries,
    indexes
  } = referencesListener;
  const referencesProviders = new Map();
  CypherTypes.SYMBOLIC_CONTEXTS.forEach(sc => {
    referencesProviders.set(sc, new ReferencesProvider(queries, indexes.get(sc)));
  });
  return {
    parseTree,
    referencesListener,
    errorListener,
    referencesProviders
  };
};