ABI cleaner

process.stdin.setEncoding('utf-8');
const readline = require('readline').createInterface({ input: process.stdin });


const buffer   = [];
const uniqueBy = (array, selector) => array
	.map(selector)
	.filter((e, i, a) => a.indexOf(e) === i)
	.map(v => array.find(e => selector(e) === v));


readline.on('line', (line) => buffer.push(line));
readline.on('close', () => {
	const abi = JSON.parse(buffer.join('\n'));
	console.log(JSON.stringify([
		abi.find(({type}) => type === 'constructor'),                               // constructor
		abi.find(({type}) => type === 'receive'    ),                               // receive
		abi.find(({type}) => type === 'fallback'   ),                               // fallback
		...uniqueBy(abi.filter(({type}) => type === 'function'), e => e.signature), // functions
		...uniqueBy(abi.filter(({type}) => type === 'event'   ), e => e.signature), // events
	].filter(Boolean)))
});