@neo4j-cypher/editor-support/es/completion/CompletionTypeResolver.js

Core functionality to support Cypher integration into editors

import * as CompletionTypes from "./CompletionTypes";
import * as rules from "./rules";

// Rules are sorted starting with specific ones, and finishing with more generic ones.
const orderedCompletionRules = [rules.ruleNoop, rules.ruleVariableInExpressionPossibleFunction, rules.ruleLiteralEntry, rules.rulePropInMapLiteral, rules.ruleParamStartsWithDollar, rules.ruleSpecificParent, rules.ruleNodePattern, rules.ruleRelationshipPattern, rules.ruleProcedureOutputsInCallClause, rules.ruleCallClauseBeginning, rules.ruleConsoleCommandSubcommands, rules.rulePropertyLookup, rules.rulePossibleKeyword];
function evaluateRules(element) {
  for (let i = 0; i < orderedCompletionRules.length; i += 1) {
    const rule = orderedCompletionRules[i];
    const types = rule(element);
    if (types.length > 0) {
      return types;
    }
  }
  return [];
}
export class CompletionTypeResolver {
  static getTypes(element) {
    // If element is null, then no types
    if (element == null) {
      return {
        found: false,
        types: CompletionTypes.ALL
      };
    }

    // Retrieve types from rules
    const types = evaluateRules(element);
    if (types.length > 0) {
      return {
        found: true,
        types
      };
    }

    // If no types found, then no types
    return {
      found: false,
      types: CompletionTypes.ALL
    };
  }
}