flow like the river

BACK_BACK/node_modules/static-eval/test/eval.js

@@ -0,0 +1,177 @@
+var test = require('tape');
+var evaluate = require('../');
+var parse = require('esprima').parse;
+
+test('resolved', function (t) {
+    t.plan(1);
+    
+    var src = '[1,2,3+4*10+(n||6),foo(3+5),obj[""+"x"].y]';
+    var ast = parse(src).body[0].expression;
+    var res = evaluate(ast, {
+        n: false,
+        foo: function (x) { return x * 100 },
+        obj: { x: { y: 555 } }
+    });
+    t.deepEqual(res, [ 1, 2, 49, 800, 555 ]);
+});
+
+test('unresolved', function (t) {
+    t.plan(1);
+    
+    var src = '[1,2,3+4*10*z+n,foo(3+5),obj[""+"x"].y]';
+    var ast = parse(src).body[0].expression;
+    var res = evaluate(ast, {
+        n: 6,
+        foo: function (x) { return x * 100 },
+        obj: { x: { y: 555 } }
+    });
+    t.equal(res, undefined);
+});
+
+test('boolean', function (t) {
+    t.plan(1);
+    
+    var src = '[ 1===2+3-16/4, [2]==2, [2]!==2, [2]!==[2] ]';
+    var ast = parse(src).body[0].expression;
+    t.deepEqual(evaluate(ast), [ true, true, true, true ]);
+});
+
+test('array methods', function(t) {
+    t.plan(1);
+
+    var src = '[1, 2, 3].map(function(n) { return n * 2 })';
+    var ast = parse(src).body[0].expression;
+    t.deepEqual(evaluate(ast), [2, 4, 6]);
+});
+
+test('array methods invocation count', function(t) {
+    t.plan(2);
+
+    var variables = {
+        values: [1, 2, 3],
+        receiver: []
+    };
+    var src = 'values.forEach(function(x) { receiver.push(x); })'
+    var ast = parse(src).body[0].expression;
+    evaluate(ast, variables);
+    t.equal(variables.receiver.length, 3);
+    t.deepEqual(variables.receiver, [1, 2, 3]);
+})
+
+test('array methods with vars', function(t) {
+    t.plan(1);
+
+    var src = '[1, 2, 3].map(function(n) { return n * x })';
+    var ast = parse(src).body[0].expression;
+    t.deepEqual(evaluate(ast, {x: 2}), [2, 4, 6]);
+});
+
+test('evaluate this', function(t) {
+    t.plan(1);
+
+    var src = 'this.x + this.y.z';
+    var ast = parse(src).body[0].expression;
+    var res = evaluate(ast, {
+        'this': { x: 1, y: { z: 100 } }
+    });
+    t.equal(res, 101);
+});
+
+test('FunctionExpression unresolved', function(t) {
+    t.plan(1);
+
+    var src = '(function(){console.log("Not Good")})';
+    var ast = parse(src).body[0].expression;
+    var res = evaluate(ast, {});
+    t.equal(res, undefined);
+});
+
+test('MemberExpressions from Functions unresolved', function(t) {
+    t.plan(1);
+
+    var src = '(function () {}).constructor';
+    var ast = parse(src).body[0].expression;
+    var res = evaluate(ast, {});
+    t.equal(res, undefined);
+});
+
+test('disallow accessing constructor or __proto__', function (t) {
+    t.plan(4)
+
+    var someValue = {};
+
+    var src = 'object.constructor';
+    var ast = parse(src).body[0].expression;
+    var res = evaluate(ast, { vars: { object: someValue } });
+    t.equal(res, undefined);
+
+    var src = 'object["constructor"]';
+    var ast = parse(src).body[0].expression;
+    var res = evaluate(ast, { vars: { object: someValue } });
+    t.equal(res, undefined);
+
+    var src = 'object.__proto__';
+    var ast = parse(src).body[0].expression;
+    var res = evaluate(ast, { vars: { object: someValue } });
+    t.equal(res, undefined);
+
+    var src = 'object["__pro"+"t\x6f__"]';
+    var ast = parse(src).body[0].expression;
+    var res = evaluate(ast, { vars: { object: someValue } });
+    t.equal(res, undefined);
+});
+
+
+test('constructor at runtime only', function(t) {
+    t.plan(2)
+
+    var src = '(function myTag(y){return ""[!y?"__proto__":"constructor"][y]})("constructor")("console.log(process.env)")()'
+    var ast = parse(src).body[0].expression;
+    var res = evaluate(ast);
+    t.equal(res, undefined);
+
+    var src = '(function(prop) { return {}[prop ? "benign" : "constructor"][prop] })("constructor")("alert(1)")()'
+    var ast = parse(src).body[0].expression;
+    var res = evaluate(ast);
+    t.equal(res, undefined);
+});
+
+test('short circuit evaluation AND', function(t) {
+    t.plan(1);
+
+    var variables = {
+        value: null
+    };
+    var src = 'value && value.func()';
+    var ast = parse(src).body[0].expression;
+    var res = evaluate(ast, variables);
+    t.equals(res, null);
+})
+
+test('short circuit evaluation OR', function(t) {
+    t.plan(1);
+
+    var fnInvoked = false;
+    var variables = {
+        value: true,
+        fn: function() { fnInvoked = true}
+    };
+    var src = 'value || fn()';
+    var ast = parse(src).body[0].expression;
+    evaluate(ast, variables);
+    t.equals(fnInvoked, false);
+})
+
+test('function declaration does not invoke CallExpressions', function(t) {
+    t.plan(1);
+
+    var invoked = false;
+    var variables = {
+        noop: function(){},
+        onInvoke: function() {invoked = true}
+    };
+    var src = 'noop(function(){ onInvoke(); })';
+    var ast = parse(src).body[0].expression;
+    evaluate(ast, variables);
+    t.equal(invoked, false);
+});