tests/compiler/dart2js/js_parser_statements_test.dart

// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'dart:async';
import 'package:expect/expect.dart';
import 'package:async_helper/async_helper.dart';
import 'mock_compiler.dart';
import 'package:compiler/src/js/js.dart' as jsAst;
import 'package:compiler/src/js/js.dart' show js;


Future testStatement(String statement, arguments, String expect) {
  jsAst.Node node = js.statement(statement, arguments);
  return MockCompiler.create((MockCompiler compiler) {
    String jsText =
        jsAst.prettyPrint(node, compiler, allowVariableMinification: false)
        .getText();

    Expect.stringEquals(expect.trim(), jsText.trim());
  });
}

Future testError(String statement, arguments, [String expect = ""]) {
  return new Future.sync(() {
    bool doCheck(exception) {
      String message = '$exception';
      Expect.isTrue(message.contains(expect), '"$message" contains "$expect"');
      return true;
    }
    void action() {
      jsAst.Node node = js.statement(statement, arguments);
    }
    Expect.throws(action, doCheck);
  });
}

// Function declaration and named function.
const NAMED_FUNCTION_1 = r'''
function foo/*function declaration*/() {
  return function harry/*named function*/() { return #; }
}''';

const NAMED_FUNCTION_1_NAMED_HOLE = r'''
function foo/*function declaration*/() {
  return function harry/*named function*/() { return #hole; }
}''';

const NAMED_FUNCTION_1_ONE = r'''
function foo() {
  return function harry() {
    return 1;
  };
}''';

const MISC_1 = r'''
function foo() {
  /a/;
  #;
}''';

const MISC_1_NAMED_HOLE = r'''
function foo() {
  /a/;
  #hole;
}''';

const MISC_1_1 = r'''
function foo() {
  /a/;
  1;
  2;
}''';


void main() {

  var eOne = js('1');
  var eTwo = js('2');
  var eTrue = js('true');
  var eVar = js('x');
  var block12 = js.statement('{ 1; 2; }');
  var stm = js.statement('foo();');
  var seq1 = js('1, 2, 3');

  Expect.isTrue(eOne is jsAst.LiteralNumber);
  Expect.isTrue(eTrue is jsAst.LiteralBool);
  Expect.isTrue(block12 is jsAst.Block);

  asyncTest(() => Future.wait([
    // Interpolated Expressions are upgraded to ExpressionStatements.
    testStatement('{ #; #; }', [eOne, eOne], '{\n  1;\n  1;\n}'),
    testStatement('{ #a; #b; }', {'a': eOne, 'b': eOne}, '{\n  1;\n  1;\n}'),

    // Interpolated sub-blocks are spliced.
    testStatement('{ #; #; }', [block12, block12],
        '{\n  1;\n  2;\n  1;\n  2;\n}\n'),
    testStatement('{ #a; #b; }', {'a': block12, 'b': block12},
        '{\n  1;\n  2;\n  1;\n  2;\n}\n'),

    // If-condition.  Dart booleans are evaluated, JS Expression booleans are
    // substituted.
    testStatement('if (#) #', [eOne, block12], 'if (1) {\n  1;\n  2;\n}'),
    testStatement('if (#) #;', [eTrue, block12], 'if (true) {\n  1;\n  2;\n}'),
    testStatement('if (#) #;', [eVar, block12], 'if (x) {\n  1;\n  2;\n}'),
    testStatement('if (#) #;', ['a', block12], 'if (a) {\n  1;\n  2;\n}'),
    testStatement('if (#) #;', [true, block12], '{\n  1;\n  2;\n}'),
    testStatement('if (#) #;', [false, block12], ';'),
    testStatement('if (#) 3; else #;', [true, block12], '3;'),
    testStatement('if (#) 3; else #;', [false, block12], '{\n  1;\n  2;\n}'),
    testStatement('if (#a) #b',
                  {'a': eOne, 'b': block12},
                  'if (1) {\n  1;\n  2;\n}'),
    testStatement('if (#a) #b;',
                  {'a': eTrue, 'b': block12},
                  'if (true) {\n  1;\n  2;\n}'),
    testStatement('if (#a) #b;',
                  {'a': eVar, 'b': block12},
                  'if (x) {\n  1;\n  2;\n}'),
    testStatement('if (#a) #b;',
                  {'a': 'a', 'b': block12},
                  'if (a) {\n  1;\n  2;\n}'),
    testStatement('if (#a) #b;',
                  {'a': true, 'b': block12},
                  '{\n  1;\n  2;\n}'),
    testStatement('if (#a) #b;',
                  {'a': false, 'b': block12},
                  ';'),
    testStatement('if (#a) 3; else #b;',
                  {'a': true, 'b': block12},
                  '3;'),
    testStatement('if (#a) 3; else #b;',
                  {'a': false, 'b': block12},
                  '{\n  1;\n  2;\n}'),


    testStatement('while (#) #', [eOne, block12], 'while (1) {\n  1;\n  2;\n}'),
    testStatement('while (#) #;', [eTrue, block12],
        'while (true) {\n  1;\n  2;\n}'),
    testStatement('while (#) #;', [eVar, block12],
        'while (x) {\n  1;\n  2;\n}'),
    testStatement('while (#) #;', ['a', block12],
        'while (a) {\n  1;\n  2;\n}'),
    testStatement('while (#) #;', ['a', stm],
        'while (a)\n  foo();'),

  testStatement(
      'do { {print(1);} do while(true); while (false) } while ( true )', [],
      '''
do {
  print(1);
  do
    while (true)
      ;
  while (false);
} while (true);
'''),
    testStatement('do #; while ( # )', [block12, eOne],
        'do {\n  1;\n  2;\n} while (1); '),
    testStatement('do #; while ( # )', [block12, eTrue],
        'do {\n  1;\n  2;\n} while (true); '),
    testStatement('do #; while ( # );', [block12, eVar],
        'do {\n  1;\n  2;\n} while (x);'),
    testStatement('do { # } while ( # )', [block12, 'a'],
        'do {\n  1;\n  2;\n} while (a);'),
    testStatement('do #; while ( # )', [stm, 'a'],
        'do\n  foo();\nwhile (a);'),

    testStatement('switch (#) {}', [eOne], 'switch (1) {\n}'),
    testStatement('''
        switch (#) {
          case #: { # }
        }''', [eTrue, eOne, block12],
        'switch (true) {\n  case 1:\n    1;\n    2;\n}'),
    testStatement('''
        switch (#) {
          case #: { # }
            break;
          case #: { # }
          default: { # }
        }''', [eTrue, eOne, block12, eTwo, block12, stm], '''
switch (true) {
  case 1:
    1;
    2;
    break;
  case 2:
    1;
    2;
  default:
    foo();
}'''),

    testStatement(NAMED_FUNCTION_1, [eOne], NAMED_FUNCTION_1_ONE),
    testStatement(NAMED_FUNCTION_1_NAMED_HOLE,
                  {'hole': eOne},
                  NAMED_FUNCTION_1_ONE),

    testStatement(MISC_1, [block12], MISC_1_1),
    testStatement(MISC_1_NAMED_HOLE, {'hole': block12}, MISC_1_1),

    // Argument list splicing.
    testStatement('foo(#)', [[]], 'foo();'),
    testStatement('foo(#)', [[eOne]], 'foo(1);'),
    testStatement('foo(#)', [eOne], 'foo(1);'),
    testStatement('foo(#)', [[eTrue,eOne]], 'foo(true, 1);'),
    testStatement('foo(#a)', {'a': []}, 'foo();'),
    testStatement('foo(#a)', {'a': [eOne]}, 'foo(1);'),
    testStatement('foo(#a)', {'a': eOne}, 'foo(1);'),
    testStatement('foo(#a)', {'a': [eTrue,eOne]}, 'foo(true, 1);'),

    testStatement('foo(2,#)', [[]], 'foo(2);'),
    testStatement('foo(2,#)', [[eOne]], 'foo(2, 1);'),
    testStatement('foo(2,#)', [eOne], 'foo(2, 1);'),
    testStatement('foo(2,#)', [[eTrue,eOne]], 'foo(2, true, 1);'),
    testStatement('foo(2,#a)', {'a': []}, 'foo(2);'),
    testStatement('foo(2,#a)', {'a': [eOne]}, 'foo(2, 1);'),
    testStatement('foo(2,#a)', {'a': eOne}, 'foo(2, 1);'),
    testStatement('foo(2,#a)', {'a': [eTrue,eOne]}, 'foo(2, true, 1);'),

    testStatement('foo(#,3)', [[]], 'foo(3);'),
    testStatement('foo(#,3)', [[eOne]], 'foo(1, 3);'),
    testStatement('foo(#,3)', [eOne], 'foo(1, 3);'),
    testStatement('foo(#,3)', [[eTrue,eOne]], 'foo(true, 1, 3);'),
    testStatement('foo(#a,3)', {'a': []}, 'foo(3);'),
    testStatement('foo(#a,3)', {'a': [eOne]}, 'foo(1, 3);'),
    testStatement('foo(#a,3)', {'a': eOne}, 'foo(1, 3);'),
    testStatement('foo(#a,3)', {'a': [eTrue,eOne]}, 'foo(true, 1, 3);'),

    testStatement('foo(2,#,3)', [[]], 'foo(2, 3);'),
    testStatement('foo(2,#,3)', [[eOne]], 'foo(2, 1, 3);'),
    testStatement('foo(2,#,3)', [eOne], 'foo(2, 1, 3);'),
    testStatement('foo(2,#,3)', [[eTrue,eOne]], 'foo(2, true, 1, 3);'),
    testStatement('foo(2,#a,3)', {'a': []}, 'foo(2, 3);'),
    testStatement('foo(2,#a,3)', {'a': [eOne]}, 'foo(2, 1, 3);'),
    testStatement('foo(2,#a,3)', {'a': eOne}, 'foo(2, 1, 3);'),
    testStatement('foo(2,#a,3)', {'a': [eTrue,eOne]}, 'foo(2, true, 1, 3);'),

    // Interpolated Literals
    testStatement('a = {#: 1}', [eOne], 'a = {1: 1};'),
    testStatement('a = {#a: 1}', {'a': eOne}, 'a = {1: 1};'),
    // Maybe we should make this work?
    testError('a = {#: 1}', [1], 'is not a Literal: 1'),
    testError('a = {#a: 1}', {'a': 1}, 'is not a Literal: 1'),

    // Interpolated parameter splicing.
    testStatement('function foo(#){}', [new jsAst.Parameter('x')],
        'function foo(x) {\n}'),
    testStatement('function foo(#){}', ['x'], 'function foo(x) {\n}'),
    testStatement('function foo(#){}', [[]], 'function foo() {\n}'),
    testStatement('function foo(#){}', [['x']], 'function foo(x) {\n}'),
    testStatement('function foo(#){}', [['x', 'y']], 'function foo(x, y) {\n}'),
    testStatement('function foo(#a){}', {'a': new jsAst.Parameter('x')},
        'function foo(x) {\n}'),
    testStatement('function foo(#a){}', {'a': 'x'}, 'function foo(x) {\n}'),
    testStatement('function foo(#a){}', {'a': []}, 'function foo() {\n}'),
    testStatement('function foo(#a){}', {'a': ['x']}, 'function foo(x) {\n}'),
    testStatement('function foo(#a){}',
                  {'a': ['x', 'y']},
                  'function foo(x, y) {\n}'),

    testStatement('function foo() async {}', [], 'function foo() async {\n}'),
    testStatement('function foo() sync* {}', [], 'function foo() sync* {\n}'),
    testStatement('function foo() async* {}', [], 'function foo() async* {\n}'),

    testStatement('a = #.#', [eVar,eOne], 'a = x[1];'),
    testStatement('a = #.#', [eVar,'foo'], 'a = x.foo;'),
    testStatement('a = #a.#b', {'a': eVar, 'b': eOne}, 'a = x[1];'),
    testStatement('a = #a.#b', {'a': eVar, 'b': 'foo'}, 'a = x.foo;'),

    testStatement('function f(#) { return #.#; }', ['x', eVar,'foo'],
        'function f(x) {\n  return x.foo;\n}'),
    testStatement('function f(#a) { return #b.#c; }',
                  {'a': 'x', 'b': eVar, 'c': 'foo'},
                  'function f(x) {\n  return x.foo;\n}'),

    testStatement('#.prototype.# = function(#) { return #.# };',
        ['className', 'getterName', ['r', 'y'], 'r', 'fieldName'],
        'className.prototype.getterName = function(r, y) {\n'
        '  return r.fieldName;\n'
        '};'),
    testStatement('#a.prototype.#b = function(#c) { return #d.#e };',
                  {'a': 'className',
                  'b': 'getterName',
                  'c': ['r', 'y'],
                  'd': 'r',
                  'e': 'fieldName'},
                  'className.prototype.getterName = function(r, y) {\n'
                  '  return r.fieldName;\n'
                  '};'),

    testStatement('function foo(r, #) { return #[r](#) }',
        [['a', 'b'], 'g', ['b', 'a']],
        'function foo(r, a, b) {\n  return g[r](b, a);\n}'),
    testStatement('function foo(r, #a) { return #b[r](#c) }',
        {'a': ['a', 'b'], 'b': 'g', 'c': ['b', 'a']},
        'function foo(r, a, b) {\n  return g[r](b, a);\n}'),

    // Sequence is printed flattened
    testStatement('x = #', [seq1], 'x = (1, 2, 3);'),
    testStatement('x = (#, #)', [seq1, seq1], 'x = (1, 2, 3, 1, 2, 3);'),
    testStatement('x = #, #', [seq1, seq1], 'x = (1, 2, 3), 1, 2, 3;'),
    testStatement(
        'for (i = 0, j = #, k = 0; ; ++i, ++j, ++k){}', [seq1],
        'for (i = 0, j = (1, 2, 3), k = 0;; ++i, ++j, ++k) {\n}'),
    testStatement('x = #a', {'a': seq1}, 'x = (1, 2, 3);'),
    testStatement('x = (#a, #b)',
                  {'a': seq1, 'b': seq1},
                  'x = (1, 2, 3, 1, 2, 3);'),
    testStatement('x = #a, #b',
                  {'a': seq1, 'b': seq1},
                  'x = (1, 2, 3), 1, 2, 3;'),
    testStatement(
        'for (i = 0, j = #a, k = 0; ; ++i, ++j, ++k){}', {'a': seq1},
        'for (i = 0, j = (1, 2, 3), k = 0;; ++i, ++j, ++k) {\n}'),

    // Use the same name several times.
    testStatement('#a.prototype.#a = function(#b) { return #c.#c };',
                  {'a': 'name1_2',
                   'b': ['r', 'y'],
                   'c': 'name4_5'},
                  'name1_2.prototype.name1_2 = function(r, y) {\n'
                  '  return name4_5.name4_5;\n'
                  '};'),

    testStatement('label: while (a) { label2: break label;}', [],
        'label:\n  while (a)\n    label2:\n      break label;\n  '),


    testStatement('var # = 3', ['x'], 'var x = 3;'),
    testStatement('var # = 3',
                  [new jsAst.VariableDeclaration('x')],
                  'var x = 3;'),
    testStatement('var # = 3, # = #',
                  ['x', 'y', js.number(2)],
                  'var x = 3, y = 2;'),
    testStatement('var #a = 3, #b = #c',
        {"a": 'x', "b": 'y', "c": js.number(2)},
                  'var x = 3, y = 2;'),
    testStatement('function #() {}', ['x'], 'function x() {\n}'),
    testStatement('function #() {}',
                  [new jsAst.VariableDeclaration('x')],
                  'function x() {\n}'),
    testStatement('try {} catch (#) {}', ['x'], 'try {\n} catch (x) {\n}'),
    testStatement('try {} catch (#a) {}', {"a": 'x'}, 'try {\n} catch (x) {\n}'),
    testStatement('try {} catch (#a) {}',
                  {"a": new jsAst.VariableDeclaration('x')},
                  'try {\n} catch (x) {\n}'),

    // Test that braces around a single-statement block are removed by printer.
    testStatement('while (a) {foo()}', [],
        'while (a)\n  foo();'),
    testStatement('if (a) {foo();}', [],
        'if (a)\n  foo();'),
    testStatement('if (a) {foo();} else {foo2();}', [],
        'if (a)\n  foo();\nelse\n  foo2();'),
    testStatement('if (a) foo(); else {foo2();}', [],
        'if (a)\n  foo();\nelse\n  foo2();'),
    testStatement('do {foo();} while(a);', [],
        'do\n  foo();\nwhile (a);'),
    testStatement('label: {foo();}', [],
        'label:\n  foo();'),
    testStatement('for (var key in a) {foo();}', [],
        'for (var key in a)\n  foo();'),
    // `label: break label;` gives problems on IE. Test that it is avoided.
    testStatement('label: {break label;}', [],
        ';'),
    // This works on IE:
    testStatement('label: {label2: {break label;}}', [],
        'label:\n  label2:\n    break label;\n'),
    // Test dangling else:
    testStatement('if (a) {if (b) {foo1();}} else {foo2();}', [], """
if (a) {
  if (b)
    foo1();
} else
  foo2();"""),
    testStatement('if (a) {if (b) {foo1();} else {foo2();}}', [], """
if (a)
  if (b)
    foo1();
  else
    foo2();
"""),
    testStatement('if (a) {if (b) {foo1();} else {foo2();}} else {foo3();}',
        [], """
if (a)
  if (b)
    foo1();
  else
    foo2();
else
  foo3();"""),
    testStatement('if (a) {while (true) if (b) {foo1();}} else {foo2();}',
        [], """
if (a) {
  while (true)
    if (b)
      foo1();
} else
  foo2();"""),
  ]));
}