ractive/src/viewmodel/Computation/getComputationSignature.js

Next-generation DOM manipulation

var pattern = /\$\{([^\}]+)\}/g;

export default function ( signature ) {
	if ( typeof signature === 'function' ) {
		return { get: signature };
	}

	if ( typeof signature === 'string' ) {
		return {
			get: createFunctionFromString( signature )
		};
	}

	if ( typeof signature === 'object' && typeof signature.get === 'string' ) {
		signature = {
			get: createFunctionFromString( signature.get ),
			set: signature.set
		};
	}

	return signature;
}

function createFunctionFromString ( signature ) {
	var functionBody = 'var __ractive=this;return(' + signature.replace( pattern, function ( match, keypath ) {
		return '__ractive.get("' + keypath + '")';
	}) + ')';

	return new Function ( functionBody );
}