tg-knex-query-resolver/query-parser/parse-expression/index.js

TeselaGen's Knex based query resolver

const expressionOperatorMap = require("./expression-map");
const logDebug = (...args) => {
  if (process.env.DEBUG_TG_QUERY_RESOLVER) {
    console.log(...args);
  }
};

module.exports = function (filter, joinOperator) {
  var op = "where";
  var chainOperator = filter.chainedWith || joinOperator || undefined;
  if (chainOperator) op = chainOperator + "Where";

  var modifier = "";
  if (filter.modifier === "not") modifier = "Not";
  op += modifier;

  var expressionOperator = expressionOperatorMap[filter.operator];
  if (expressionOperator) {
    if (typeof expressionOperator === "string") {
      var expOp = {
        op: op,
        args: [filter.field, expressionOperator, filter.args[0]],
      };
      logDebug(expOp);
      return expOp;
    } else {
      return expressionOperator(filter, chainOperator);
    }
  }

  throw new Error("Unrecognized Expression Operator: " + filter.operator);
};