Diffusion Ant (master) Code

ant/examples/spec/tco_brackets.js
8755416ca476master

tco_brackets.js
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			import { test, summary } from './helpers.js';

			console.log('TCO Bracket Edge Cases\n');

			function indexCallResult(n) {
			if (n <= 0) return [42];
			return indexCallResult(n - 1);
			}
			test('f() then index (small)', indexCallResult(5)[0], 42);

			function indexByCall(n) {
			if (n <= 0) return [99];
			return indexByCall(n - 1);
			}
			function zeroFn() {
			return 0;
			}
			test('f()[g()] (small)', indexByCall(3)[zeroFn()], 99);

			function returnBracketAccess(arr) {
			return arr[0];
			}
			test('bare bracket access', returnBracketAccess([7]), 7);

			function indexArrByCall(arr) {
			return arr[zeroFn()];
			}
			test('arr[f()] access', indexArrByCall([55]), 55);

			const methods = {
			greet() {
			return 'hello';
			},
			farewell() {
			return 'bye';
			}
			};
			function computedCall(key) {
			return methods[key]();
			}
			test('obj[key]() simple', computedCall('greet'), 'hello');
			test('obj[key]() simple 2', computedCall('farewell'), 'bye');

			const ops = {
			dec(n) {
			return recurseViaComputed(n - 1);
			}
			};
			function recurseViaComputed(n) {
			if (n <= 0) return 'done';
			return ops['dec'](n);
			}
			test('obj[key]() deep recursion', recurseViaComputed(100000), 'done');

			function callWithBracketArg(arr) {
			return identity(arr[0]);
			}
			function identity(x) {
			return x;
			}
			test('f(a[0]) bracket in arg', callWithBracketArg([33]), 33);

			function callWithBracketBinopArg(arr) {
			return identity(arr[0] + arr[1]);
			}
			test('f(a[0]+a[1]) binop inside args', callWithBracketBinopArg([10, 20]), 30);

			function recurseWithBracketArg(arr, i) {
			if (i >= arr.length) return 0;
			return recurseWithBracketArg(arr, i + 1);
			}
			test('deep with bracket arg', recurseWithBracketArg(new Array(100000), 0), 0);

			const handlers = {};
			for (let i = 0; i < 10; i++) {
			handlers['h' + i] = function (n) {
			if (n <= 0) return 'handled';
			return handlers['h' + i](n - 1);
			};
			}
			test('obj[key+expr]() result', handlers['h0'](50), 'handled');

			const dispatch = {
			action_run(n) {
			if (n <= 0) return 'ran';
			return dispatch['action' + '_' + 'run'](n - 1);
			}
			};
			test('obj[a+b]() deep (may fail without bracket fix)', dispatch['action_run'](100000), 'ran');

			const table = [];
			for (let i = 0; i < 20; i++) {
			table[i] = function () {
			return i;
			};
			}
			function callFromTable(a) {
			return table[a * 2 + 1]();
			}
			test('table[a*2+1]() computed', callFromTable(3), 7);

			function ternaryBracket(arr, flag) {
			return flag ? identity(arr[0]) : identity(arr[1]);
			}
			test('ternary with bracket args true', ternaryBracket([10, 20], true), 10);
			test('ternary with bracket args false', ternaryBracket([10, 20], false), 20);

			function ternaryComputedVsPlain(flag, n) {
			if (n <= 0) return 'end';
			return flag ? ops['dec'](n) : ternaryComputedVsPlain(flag, n - 1);
			}
			test('ternary computed vs plain', ternaryComputedVsPlain(false, 100000), 'end');

			summary();

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