@neo4j-cypher/editor-support/es/completion/rules/ruleNodePattern.js

Core functionality to support Cypher integration into editors

import * as CypherTypes from "../../lang/CypherTypes";
import * as CompletionTypes from "../CompletionTypes";

// If we are in relationship pattern then return variables and types
export default (element => {
  const parent = element.getParent ? element.getParent() : null;
  const text = element.getText();
  // Special case. We are at the beginning of first node pattern.
  if (parent) {
    if (parent instanceof CypherTypes.PATTERN_ELEMENT_CONTEXT && text === "(") {
      return [{
        type: CompletionTypes.VARIABLE
      }, {
        type: CompletionTypes.LABEL
      }];
    }
    if (parent instanceof CypherTypes.NODE_PATTERN_CONTEXT) {
      // We are at the begining of node pattern
      if (text === "(") {
        return [{
          type: CompletionTypes.VARIABLE
        }, {
          type: CompletionTypes.LABEL
        }];
      }
      if (text === ":") {
        return [{
          type: CompletionTypes.LABEL
        }];
      }
    }
  }
  return [];
});