@atomic-ehr/fhirpath/src/operations/unary-plus-operator.ts

A TypeScript implementation of FHIRPath

import type { OperatorDefinition } from '../types';
import { PRECEDENCE } from '../types';
import type { OperationEvaluator } from '../types';
import { box, unbox } from '../boxing';

export const evaluate: OperationEvaluator = async (input, context, operand) => {
  // Unary plus returns the operand as-is
  return { value: operand, context };
};

export const unaryPlusOperator: OperatorDefinition & { evaluate: OperationEvaluator } = {
  symbol: '+',
  name: 'unaryPlus',
  category: ['arithmetic'],
  precedence: PRECEDENCE.UNARY,
  associativity: 'right',
  description: 'Unary plus operator',
  examples: ['+5'],
  signatures: [],
  evaluate
};