import postfix from '@tannin/postfix';
import evaluate from '@tannin/evaluate';

/**
 * Given a C expression, returns a function which can be called to evaluate its
 * result.
 *
 * @example
 *
 * ```js
 * import compile from '@tannin/compile';
 *
 * const evaluate = compile( 'n > 1' );
 *
 * evaluate( { n: 2 } );
 * // ⇒ true
 * ```
 *
 * @param {string} expression C expression.
 *
 * @return {(variables?:{[variable:string]:*})=>*} Compiled evaluator.
 */
export default function compile( expression ) {
	var terms = postfix( expression );

	return function( variables ) {
		return evaluate( terms, variables );
	};
}