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UglifyJS/test/mocha/arguments.js
Anthony Van de Gejuchte 07734b000a Destructuring consistency fixes (#1417) 
- Use AST_Destructuring for lhf assignment patterns
- Use AST_DefaultAssign for default assignments
- Add more checks for lhs expressions
- Add lots of testing
- Cleanup ast (e.g. remove default property)
- Fix #1402 based on a patch from @kzc
- Refine spread allowance in array destructring pattern
- Add destructuring AST tree checker
2017-02-24 08:49:19 +08:00

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var UglifyJS = require('../../');
var assert = require("assert");
describe("arguments", function() {
it("Should known that arguments in functions are local scoped", function() {
var ast = UglifyJS.parse("var arguments; var f = function() {arguments.length}");
ast.figure_out_scope();
// Test scope of `var arguments`
assert.strictEqual(ast.find_variable("arguments").global, true);
// Select arguments symbol in function
var symbol = ast.body[1].definitions[0].value.find_variable("arguments");
assert.strictEqual(symbol.global, false);
assert.strictEqual(symbol.scope, ast. // From ast
body[1]. // Select 2nd statement (equals to `var f ...`)
definitions[0]. // First definition of selected statement
value // Select function as scope
);
});
it("Should recognize when a function uses arguments", function() {
var ast = UglifyJS.parse("function a(){function b(){function c(){}; return arguments[0];}}");
ast.figure_out_scope();
assert.strictEqual(ast.body[0].uses_arguments, false);
assert.strictEqual(ast.body[0].body[0].uses_arguments, true);
assert.strictEqual(ast.body[0].body[0].body[0].uses_arguments, false);
});
it("Should parse a function containing default assignment correctly", function() {
var ast = UglifyJS.parse("function foo(a = 123) {}");
assert(ast.body[0] instanceof UglifyJS.AST_Defun);
assert.strictEqual(ast.body[0].argnames.length, 1);
// First argument
assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_DefaultAssign);
assert(ast.body[0].argnames[0].left instanceof UglifyJS.AST_SymbolFunarg);
assert.strictEqual(ast.body[0].argnames[0].operator, "=");
assert(ast.body[0].argnames[0].right instanceof UglifyJS.AST_Number);
ast = UglifyJS.parse("function foo(a = a) {}");
assert(ast.body[0] instanceof UglifyJS.AST_Defun);
assert.strictEqual(ast.body[0].argnames.length, 1);
// First argument
assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_DefaultAssign);
assert(ast.body[0].argnames[0].left instanceof UglifyJS.AST_SymbolFunarg);
assert.strictEqual(ast.body[0].argnames[0].operator, "=");
assert(ast.body[0].argnames[0].right instanceof UglifyJS.AST_SymbolRef);
});
it("Should parse a function containing default assignments in destructuring correctly", function() {
var ast = UglifyJS.parse("function foo([a = 123]) {}");
assert(ast.body[0] instanceof UglifyJS.AST_Defun);
assert.strictEqual(ast.body[0].argnames.length, 1);
// First argument
assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_Destructuring);
assert.strictEqual(ast.body[0].argnames[0].is_array, true);
assert.strictEqual(ast.body[0].argnames[0].names.length, 1);
assert(ast.body[0].argnames[0].names[0] instanceof UglifyJS.AST_DefaultAssign);
assert(ast.body[0].argnames[0].names[0].left instanceof UglifyJS.AST_SymbolFunarg);
assert.strictEqual(ast.body[0].argnames[0].names[0].operator, "=");
assert(ast.body[0].argnames[0].names[0].right instanceof UglifyJS.AST_Number);
ast = UglifyJS.parse("function foo({a = 123}) {}");
assert(ast.body[0] instanceof UglifyJS.AST_Defun);
assert.strictEqual(ast.body[0].argnames.length, 1);
// First argument
assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_Destructuring);
assert.strictEqual(ast.body[0].argnames[0].is_array, false);
assert.strictEqual(ast.body[0].argnames[0].names.length, 1);
assert(ast.body[0].argnames[0].names[0] instanceof UglifyJS.AST_ObjectKeyVal);
assert.strictEqual(ast.body[0].argnames[0].names[0].key, "a");
// Property a of first argument
assert(ast.body[0].argnames[0].names[0].value instanceof UglifyJS.AST_DefaultAssign);
assert(ast.body[0].argnames[0].names[0].value.left instanceof UglifyJS.AST_SymbolFunarg);
assert.strictEqual(ast.body[0].argnames[0].names[0].value.operator, "=");
assert(ast.body[0].argnames[0].names[0].value.right instanceof UglifyJS.AST_Number);
ast = UglifyJS.parse("function foo({a: a = 123}) {}");
assert(ast.body[0] instanceof UglifyJS.AST_Defun);
assert.strictEqual(ast.body[0].argnames.length, 1);
// First argument
assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_Destructuring);
assert.strictEqual(ast.body[0].argnames[0].is_array, false);
assert.strictEqual(ast.body[0].argnames[0].names.length, 1);
// Content destructuring of first argument
assert(ast.body[0].argnames[0].names[0] instanceof UglifyJS.AST_ObjectKeyVal);
assert.strictEqual(ast.body[0].argnames[0].names[0].key, "a");
assert(ast.body[0].argnames[0].names[0].value instanceof UglifyJS.AST_DefaultAssign);
// Property a of first argument
assert(ast.body[0].argnames[0].names[0].value instanceof UglifyJS.AST_DefaultAssign);
assert(ast.body[0].argnames[0].names[0].value.left instanceof UglifyJS.AST_SymbolFunarg);
assert.strictEqual(ast.body[0].argnames[0].names[0].value.operator, "=");
assert(ast.body[0].argnames[0].names[0].value.right instanceof UglifyJS.AST_Number);
});
it("Should parse a function containing default assignments in complex destructuring correctly", function() {
var ast = UglifyJS.parse("function foo([a, [b = 123]]){}");
assert(ast.body[0] instanceof UglifyJS.AST_Defun);
assert.strictEqual(ast.body[0].argnames.length, 1);
// Check first argument
assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_Destructuring);
assert.strictEqual(ast.body[0].argnames[0].is_array, true);
assert.strictEqual(ast.body[0].argnames[0].names.length, 2);
// Check whole destructuring structure of first argument
assert(ast.body[0].argnames[0].names[0] instanceof UglifyJS.AST_SymbolFunarg);
assert(ast.body[0].argnames[0].names[1] instanceof UglifyJS.AST_Destructuring);
assert.strictEqual(ast.body[0].argnames[0].names[1].is_array, true);
// Check content of second destructuring element (which is the nested destructuring pattern)
assert(ast.body[0].argnames[0].names[1].names[0] instanceof UglifyJS.AST_DefaultAssign);
assert(ast.body[0].argnames[0].names[1].names[0].left instanceof UglifyJS.AST_SymbolFunarg);
assert.strictEqual(ast.body[0].argnames[0].names[1].names[0].operator, "=");
assert(ast.body[0].argnames[0].names[1].names[0].right instanceof UglifyJS.AST_Number);
ast = UglifyJS.parse("function foo([a, {b: c = 123}]){}");
assert(ast.body[0] instanceof UglifyJS.AST_Defun);
assert.strictEqual(ast.body[0].argnames.length, 1);
// Check first argument
assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_Destructuring);
assert.strictEqual(ast.body[0].argnames[0].is_array, true);
assert.strictEqual(ast.body[0].argnames[0].names.length, 2);
// Check whole destructuring structure of first argument
assert(ast.body[0].argnames[0].names[0] instanceof UglifyJS.AST_SymbolFunarg);
assert(ast.body[0].argnames[0].names[1] instanceof UglifyJS.AST_Destructuring);
assert.strictEqual(ast.body[0].argnames[0].names[1].is_array, false);
// Check content of second destructuring element (which is the nested destructuring pattern)
assert(ast.body[0].argnames[0].names[1].names[0] instanceof UglifyJS.AST_ObjectKeyVal);
assert.strictEqual(ast.body[0].argnames[0].names[1].names[0].key, "b");
assert(ast.body[0].argnames[0].names[1].names[0].value instanceof UglifyJS.AST_DefaultAssign);
// Property b of second argument
assert(ast.body[0].argnames[0].names[1].names[0].value instanceof UglifyJS.AST_DefaultAssign);
assert(ast.body[0].argnames[0].names[1].names[0].value.left instanceof UglifyJS.AST_SymbolFunarg);
assert.strictEqual(ast.body[0].argnames[0].names[1].names[0].value.operator, "=");
assert(ast.body[0].argnames[0].names[1].names[0].value.right instanceof UglifyJS.AST_Number);
ast = UglifyJS.parse("function foo({a, b: {b = 123}}){}");
assert(ast.body[0] instanceof UglifyJS.AST_Defun);
assert.strictEqual(ast.body[0].argnames.length, 1);
// Check first argument
assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_Destructuring);
assert.strictEqual(ast.body[0].argnames[0].is_array, false);
assert.strictEqual(ast.body[0].argnames[0].names.length, 2);
// Check whole destructuring structure of first argument
assert(ast.body[0].argnames[0].names[0] instanceof UglifyJS.AST_ObjectKeyVal);
assert.strictEqual(ast.body[0].argnames[0].names[0].key, "a");
assert(ast.body[0].argnames[0].names[0].value instanceof UglifyJS.AST_SymbolFunarg);
assert(ast.body[0].argnames[0].names[1] instanceof UglifyJS.AST_ObjectKeyVal);
assert.strictEqual(ast.body[0].argnames[0].names[1].key, "b");
assert(ast.body[0].argnames[0].names[1].value instanceof UglifyJS.AST_Destructuring);
// Check content of nested destructuring in first parameter
var content = ast.body[0].argnames[0].names[1].value
assert.strictEqual(content.is_array, false);
assert.strictEqual(content.names.length, 1);
assert(content.names[0] instanceof UglifyJS.AST_ObjectKeyVal);
assert.strictEqual(content.names[0].key, "b");
assert(content.names[0].value instanceof UglifyJS.AST_DefaultAssign);
assert(content.names[0].value.left instanceof UglifyJS.AST_SymbolFunarg);
assert.strictEqual(content.names[0].value.operator, "=");
assert(content.names[0].value.right instanceof UglifyJS.AST_Number);
ast = UglifyJS.parse("function foo({a: {b = 123}}){}");
assert(ast.body[0] instanceof UglifyJS.AST_Defun);
assert.strictEqual(ast.body[0].argnames.length, 1);
// Check first argument
assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_Destructuring);
assert.strictEqual(ast.body[0].argnames[0].is_array, false);
assert.strictEqual(ast.body[0].argnames[0].names.length, 1);
// Check whole destructuring structure of first argument
assert(ast.body[0].argnames[0].names[0] instanceof UglifyJS.AST_ObjectKeyVal);
assert.strictEqual(ast.body[0].argnames[0].names[0].key, "a");
assert(ast.body[0].argnames[0].names[0].value instanceof UglifyJS.AST_Destructuring);
// Check content of nested destructuring
content = ast.body[0].argnames[0].names[0].value
assert.strictEqual(content.is_array, false);
assert.strictEqual(content.names.length, 1);
assert(content.names[0] instanceof UglifyJS.AST_ObjectKeyVal);
assert.strictEqual(content.names[0].key, "b");
assert(content.names[0].value instanceof UglifyJS.AST_DefaultAssign);
assert(content.names[0].value.left instanceof UglifyJS.AST_SymbolFunarg);
assert.strictEqual(content.names[0].value.operator, "=");
assert(content.names[0].value.right instanceof UglifyJS.AST_Number);
});
it("Should parse spread correctly", function() {
var ast = UglifyJS.parse("function foo(a, b, ...c){}");
assert(ast.body[0] instanceof UglifyJS.AST_Defun);
assert.strictEqual(ast.body[0].argnames.length, 3);
// Check parameters
assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_SymbolFunarg);
assert(ast.body[0].argnames[1] instanceof UglifyJS.AST_SymbolFunarg);
assert(ast.body[0].argnames[2] instanceof UglifyJS.AST_Expansion);
assert(ast.body[0].argnames[2].expression instanceof UglifyJS.AST_SymbolFunarg);
ast = UglifyJS.parse("function foo([a, b, ...c]){}");
assert(ast.body[0] instanceof UglifyJS.AST_Defun);
assert.strictEqual(ast.body[0].argnames.length, 1);
// Check first parameter
assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_Destructuring);
assert.strictEqual(ast.body[0].argnames[0].is_array, true);
// Check content first parameter
assert(ast.body[0].argnames[0].names[0] instanceof UglifyJS.AST_SymbolFunarg);
assert(ast.body[0].argnames[0].names[1] instanceof UglifyJS.AST_SymbolFunarg);
assert(ast.body[0].argnames[0].names[2] instanceof UglifyJS.AST_Expansion);
assert(ast.body[0].argnames[0].names[2].expression instanceof UglifyJS.AST_SymbolFunarg);
ast = UglifyJS.parse("function foo([a, b, [c, ...d]]){}");
assert(ast.body[0] instanceof UglifyJS.AST_Defun);
assert.strictEqual(ast.body[0].argnames.length, 1);
// Check first parameter
assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_Destructuring);
assert.strictEqual(ast.body[0].argnames[0].is_array, true);
// Check content outer destructuring array
assert(ast.body[0].argnames[0].names[0] instanceof UglifyJS.AST_SymbolFunarg);
assert(ast.body[0].argnames[0].names[1] instanceof UglifyJS.AST_SymbolFunarg);
assert(ast.body[0].argnames[0].names[2] instanceof UglifyJS.AST_Destructuring);
assert.strictEqual(ast.body[0].argnames[0].names[2].is_array, true);
// Check content nested destructuring array
assert.strictEqual(ast.body[0].argnames[0].names[2].names.length, 2);
assert(ast.body[0].argnames[0].names[2].names[0] instanceof UglifyJS.AST_SymbolFunarg);
assert(ast.body[0].argnames[0].names[2].names[1] instanceof UglifyJS.AST_Expansion);
assert(ast.body[0].argnames[0].names[2].names[1].expression instanceof UglifyJS.AST_SymbolFunarg);
ast = UglifyJS.parse("function foo({a: [b, ...c]}){}");
assert(ast.body[0] instanceof UglifyJS.AST_Defun);
assert.strictEqual(ast.body[0].argnames.length, 1);
// Check first parameter
assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_Destructuring);
assert.strictEqual(ast.body[0].argnames[0].is_array, false);
// Check outer destructuring object
assert.strictEqual(ast.body[0].argnames[0].names.length, 1);
assert(ast.body[0].argnames[0].names[0] instanceof UglifyJS.AST_ObjectKeyVal);
assert.strictEqual(ast.body[0].argnames[0].names[0].key, "a");
assert(ast.body[0].argnames[0].names[0].value instanceof UglifyJS.AST_Destructuring);
assert.strictEqual(ast.body[0].argnames[0].names[0].value.is_array, true);
// Check content nested destructuring array
assert.strictEqual(ast.body[0].argnames[0].names[0].value.names.length, 2);
assert(ast.body[0].argnames[0].names[0].value.names[0] instanceof UglifyJS.AST_SymbolFunarg);
assert(ast.body[0].argnames[0].names[0].value.names[1] instanceof UglifyJS.AST_Expansion);
assert(ast.body[0].argnames[0].names[0].value.names[1].expression instanceof UglifyJS.AST_SymbolFunarg);
});
});
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