json-sql-enhanced/lib/dialects/base/operators/logical.js

Node.js library for mapping MongoDB-style query objects to SQL queries with enhanced operators and multi-dialect support

'use strict';

function buildLogicalOperator(operator, values) {
  // Ensure values is an array
  if (!Array.isArray(values)) {
    return '';
  }

  if (values.length === 0) {
    return '';
  }

  let result = values.join(' ' + operator + ' ');
  if (values.length > 1) {
    result = '(' + result + ')';
  }

  return result;
}

module.exports = function (dialect) {
  dialect.operators.logical.add('$and', {
    fn(values) {
      return buildLogicalOperator('and', values);
    },
  });

  dialect.operators.logical.add('$or', {
    fn(values) {
      return buildLogicalOperator('or', values);
    },
  });

  dialect.operators.logical.add('$not', {
    fn(values) {
      return 'not ' + buildLogicalOperator('and', values);
    },
  });

  dialect.operators.logical.add('$nor', {
    fn(values) {
      return 'not ' + buildLogicalOperator('or', values);
    },
  });
};