blob: 6fd94603287f13735a8878bc55c817438aa95153 [file] [log] [blame]
// Copyright (c) 2021, 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 'package:analyzer/dart/ast/ast.dart';
import 'package:analyzer/src/dart/error/syntactic_errors.dart';
import 'package:test/test.dart';
import 'package:test_reflective_loader/test_reflective_loader.dart';
import '../util/feature_sets.dart';
import 'parser_test_base.dart';
main() {
defineReflectiveSuite(() {
defineReflectiveTests(FunctionReferenceParserTest);
});
}
/// Tests exercising the fasta parser's handling of generic instantiations.
@reflectiveTest
class FunctionReferenceParserTest extends FastaParserTestCase {
/// Verifies that the given [node] matches `f<a, b>`.
void expect_f_a_b(AstNode node) {
var functionReference = node as FunctionReference;
expect((functionReference.function as SimpleIdentifier).name, 'f');
var typeArgs = functionReference.typeArguments!.arguments;
expect(typeArgs, hasLength(2));
expect(((typeArgs[0] as NamedType).name as SimpleIdentifier).name, 'a');
expect(((typeArgs[1] as NamedType).name as SimpleIdentifier).name, 'b');
}
void expect_two_args(MethodInvocation methodInvocation) {
var arguments = methodInvocation.argumentList.arguments;
expect(arguments, hasLength(2));
expect(arguments[0], TypeMatcher<BinaryExpression>());
expect(arguments[1], TypeMatcher<BinaryExpression>());
}
void test_feature_disabled() {
expect_f_a_b(
(parseStatement('f<a, b>;', featureSet: FeatureSets.language_2_13)
as ExpressionStatement)
.expression);
listener.assertErrors([
expectedError(ParserErrorCode.EXPERIMENT_NOT_ENABLED, 1, 6),
]);
}
void test_followingToken_accepted_closeBrace() {
expect_f_a_b((parseExpression('{f<a, b>}') as SetOrMapLiteral).elements[0]);
}
void test_followingToken_accepted_closeBracket() {
expect_f_a_b((parseExpression('[f<a, b>]') as ListLiteral).elements[0]);
}
void test_followingToken_accepted_closeParen() {
expect_f_a_b((parseExpression('g(f<a, b>)') as MethodInvocation)
.argumentList
.arguments[0]);
}
void test_followingToken_accepted_colon() {
expect_f_a_b(((parseExpression('{f<a, b>: null}') as SetOrMapLiteral)
.elements[0] as MapLiteralEntry)
.key);
}
void test_followingToken_accepted_comma() {
expect_f_a_b(
(parseExpression('[f<a, b>, null]') as ListLiteral).elements[0]);
}
void test_followingToken_accepted_equals() {
expect_f_a_b(
(parseExpression('f<a, b> == null') as BinaryExpression).leftOperand);
}
void test_followingToken_accepted_not_equals() {
expect_f_a_b(
(parseExpression('f<a, b> != null') as BinaryExpression).leftOperand);
}
void test_followingToken_accepted_openParen() {
// This is a special case because when a `(` follows `<typeArguments>` it is
// parsed as a MethodInvocation rather than a GenericInstantiation.
var methodInvocation = parseExpression('f<a, b>()') as MethodInvocation;
expect(methodInvocation.methodName.name, 'f');
var typeArgs = methodInvocation.typeArguments!.arguments;
expect(typeArgs, hasLength(2));
expect(((typeArgs[0] as NamedType).name as SimpleIdentifier).name, 'a');
expect(((typeArgs[1] as NamedType).name as SimpleIdentifier).name, 'b');
expect(methodInvocation.argumentList.arguments, isEmpty);
}
void test_followingToken_accepted_period_methodInvocation() {
// This is a special case because `f<a, b>.methodName(...)` is parsed as an
// InstanceCreationExpression.
var instanceCreationExpression =
parseExpression('f<a, b>.toString()') as InstanceCreationExpression;
var constructorName = instanceCreationExpression.constructorName;
var type = constructorName.type;
expect((type.name as SimpleIdentifier).name, 'f');
var typeArgs = type.typeArguments!.arguments;
expect(typeArgs, hasLength(2));
expect(((typeArgs[0] as NamedType).name as SimpleIdentifier).name, 'a');
expect(((typeArgs[1] as NamedType).name as SimpleIdentifier).name, 'b');
expect(constructorName.name!.name, 'toString');
expect(instanceCreationExpression.argumentList.arguments, isEmpty);
}
void test_followingToken_accepted_period_methodInvocation_generic() {
expect_f_a_b(
(parseExpression('f<a, b>.foo<c>()') as MethodInvocation).target!);
}
void test_followingToken_accepted_period_propertyAccess() {
expect_f_a_b(
(parseExpression('f<a, b>.hashCode') as PropertyAccess).target!);
}
void test_followingToken_accepted_semicolon() {
expect_f_a_b(
(parseStatement('f<a, b>;') as ExpressionStatement).expression);
listener.assertNoErrors();
}
void test_followingToken_rejected_ampersand() {
expect_two_args(parseExpression('f(a<b,c>&d)', errors: [
expectedError(ParserErrorCode.MISSING_IDENTIFIER, 8, 1),
]) as MethodInvocation);
}
void test_followingToken_rejected_as() {
expect_two_args(parseExpression('f(a<b,c>as)') as MethodInvocation);
}
void test_followingToken_rejected_asterisk() {
expect_two_args(parseExpression('f(a<b,c>*d)', errors: [
expectedError(ParserErrorCode.MISSING_IDENTIFIER, 8, 1),
]) as MethodInvocation);
}
void test_followingToken_rejected_bang_openBracket() {
expect_two_args(parseExpression('f(a<b,c>![d])') as MethodInvocation);
}
void test_followingToken_rejected_bang_paren() {
expect_two_args(parseExpression('f(a<b,c>!(d))') as MethodInvocation);
}
void test_followingToken_rejected_bar() {
expect_two_args(parseExpression('f(a<b,c>|d)', errors: [
expectedError(ParserErrorCode.MISSING_IDENTIFIER, 8, 1),
]) as MethodInvocation);
}
void test_followingToken_rejected_caret() {
expect_two_args(parseExpression('f(a<b,c>^d)', errors: [
expectedError(ParserErrorCode.MISSING_IDENTIFIER, 8, 1),
]) as MethodInvocation);
}
void test_followingToken_rejected_is() {
var methodInvocation = parseExpression('f(a<b,c> is int)', errors: [
expectedError(ParserErrorCode.MISSING_IDENTIFIER, 9, 2),
]) as MethodInvocation;
var arguments = methodInvocation.argumentList.arguments;
expect(arguments, hasLength(2));
expect(arguments[0], TypeMatcher<BinaryExpression>());
expect(arguments[1], TypeMatcher<IsExpression>());
}
void test_followingToken_rejected_lessThan() {
// Note: in principle we could parse this as a generic instantiation of a
// generic instantiation, but such an expression would be meaningless so we
// reject it at the parser level.
parseExpression('f<a><b>', errors: [
expectedError(ParserErrorCode.EQUALITY_CANNOT_BE_EQUALITY_OPERAND, 3, 1),
expectedError(ParserErrorCode.EXPECTED_TOKEN, 7, 0),
]);
}
void test_followingToken_rejected_minus() {
expect_two_args(parseExpression('f(a<b,c>-d)') as MethodInvocation);
}
void test_followingToken_rejected_openBracket() {
expect_two_args(parseExpression('f(a<b,c>[d])') as MethodInvocation);
}
void test_followingToken_rejected_openBracket_error() {
// Note that theoretically this could be successfully parsed by interpreting
// `<` and `>` as delimiting type arguments, but the parser doesn't have
// enough lookahead to see that this is the only possible error-free parse;
// it commits to interpreting `<` and `>` as operators when it sees the `[`.
expect_two_args(parseExpression('f(a<b,c>[d]>e)', errors: [
expectedError(ParserErrorCode.EQUALITY_CANNOT_BE_EQUALITY_OPERAND, 11, 1),
]) as MethodInvocation);
}
void test_followingToken_rejected_openBracket_unambiguous() {
expect_two_args(parseExpression('f(a<b,c>[d, e])') as MethodInvocation);
}
void test_followingToken_rejected_percent() {
expect_two_args(parseExpression('f(a<b,c>%d)', errors: [
expectedError(ParserErrorCode.MISSING_IDENTIFIER, 8, 1),
]) as MethodInvocation);
}
void test_followingToken_rejected_period_period() {
var methodInvocation = parseExpression('f(a<b,c>..toString())', errors: [
expectedError(ParserErrorCode.MISSING_IDENTIFIER, 8, 2),
]) as MethodInvocation;
var arguments = methodInvocation.argumentList.arguments;
expect(arguments, hasLength(2));
expect(arguments[0], TypeMatcher<BinaryExpression>());
expect(arguments[1], TypeMatcher<CascadeExpression>());
}
void test_followingToken_rejected_plus() {
expect_two_args(parseExpression('f(a<b,c>+d)', errors: [
expectedError(ParserErrorCode.MISSING_IDENTIFIER, 8, 1),
]) as MethodInvocation);
}
void test_followingToken_rejected_question() {
var methodInvocation = parseExpression('f(a<b,c> ? null : null)', errors: [
expectedError(ParserErrorCode.MISSING_IDENTIFIER, 9, 1),
]) as MethodInvocation;
var arguments = methodInvocation.argumentList.arguments;
expect(arguments, hasLength(2));
expect(arguments[0], TypeMatcher<BinaryExpression>());
expect(arguments[1], TypeMatcher<ConditionalExpression>());
}
void test_followingToken_rejected_question_period_methodInvocation() {
expect_two_args(parseExpression('f(a<b,c>?.toString())', errors: [
expectedError(ParserErrorCode.MISSING_IDENTIFIER, 8, 2),
]) as MethodInvocation);
}
void test_followingToken_rejected_question_period_methodInvocation_generic() {
expect_two_args(parseExpression('f(a<b,c>?.foo<c>())', errors: [
expectedError(ParserErrorCode.MISSING_IDENTIFIER, 8, 2),
]) as MethodInvocation);
}
void test_followingToken_rejected_question_period_period() {
var methodInvocation = parseExpression('f(a<b,c>?..toString())', errors: [
expectedError(ParserErrorCode.MISSING_IDENTIFIER, 8, 3),
expectedError(ParserErrorCode.EXPECTED_TOKEN, 11, 8),
]) as MethodInvocation;
var arguments = methodInvocation.argumentList.arguments;
expect(arguments, hasLength(3));
expect(arguments[0], TypeMatcher<BinaryExpression>());
expect(arguments[1], TypeMatcher<BinaryExpression>());
expect(arguments[2], TypeMatcher<MethodInvocation>());
}
void test_followingToken_rejected_question_period_propertyAccess() {
expect_two_args(parseExpression('f(a<b,c>?.hashCode)', errors: [
expectedError(ParserErrorCode.MISSING_IDENTIFIER, 8, 2),
]) as MethodInvocation);
}
void test_followingToken_rejected_question_question() {
expect_two_args(parseExpression('f(a<b,c> ?? d)', errors: [
expectedError(ParserErrorCode.MISSING_IDENTIFIER, 9, 2),
]) as MethodInvocation);
}
void test_followingToken_rejected_slash() {
expect_two_args(parseExpression('f(a<b,c>/d)', errors: [
expectedError(ParserErrorCode.MISSING_IDENTIFIER, 8, 1),
]) as MethodInvocation);
}
void test_followingToken_rejected_tilde_slash() {
expect_two_args(parseExpression('f(a<b,c>~/d)', errors: [
expectedError(ParserErrorCode.MISSING_IDENTIFIER, 8, 2),
]) as MethodInvocation);
}
void test_functionReference_after_indexExpression() {
// Note: this is not legal Dart, but it's important that we do error
// recovery and don't crash the parser.
var functionReference = parseExpression('x[0]<a, b>') as FunctionReference;
expect(functionReference.function, TypeMatcher<IndexExpression>());
var typeArgs = functionReference.typeArguments!.arguments;
expect(typeArgs, hasLength(2));
expect(((typeArgs[0] as NamedType).name as SimpleIdentifier).name, 'a');
expect(((typeArgs[1] as NamedType).name as SimpleIdentifier).name, 'b');
}
void test_functionReference_after_indexExpression_bang() {
// Note: this is not legal Dart, but it's important that we do error
// recovery and don't crash the parser.
var functionReference = parseExpression('x[0]!<a, b>') as FunctionReference;
expect(functionReference.function, TypeMatcher<PostfixExpression>());
var typeArgs = functionReference.typeArguments!.arguments;
expect(typeArgs, hasLength(2));
expect(((typeArgs[0] as NamedType).name as SimpleIdentifier).name, 'a');
expect(((typeArgs[1] as NamedType).name as SimpleIdentifier).name, 'b');
}
void test_functionReference_after_indexExpression_functionCall() {
// Note: this is not legal Dart, but it's important that we do error
// recovery and don't crash the parser.
var functionReference =
parseExpression('x[0]()<a, b>') as FunctionReference;
expect(functionReference.function,
TypeMatcher<FunctionExpressionInvocation>());
var typeArgs = functionReference.typeArguments!.arguments;
expect(typeArgs, hasLength(2));
expect(((typeArgs[0] as NamedType).name as SimpleIdentifier).name, 'a');
expect(((typeArgs[1] as NamedType).name as SimpleIdentifier).name, 'b');
}
void test_functionReference_after_indexExpression_nullAware() {
// Note: this is not legal Dart, but it's important that we do error
// recovery and don't crash the parser.
var functionReference = parseExpression('x?[0]<a, b>') as FunctionReference;
expect(functionReference.function, TypeMatcher<IndexExpression>());
var typeArgs = functionReference.typeArguments!.arguments;
expect(typeArgs, hasLength(2));
expect(((typeArgs[0] as NamedType).name as SimpleIdentifier).name, 'a');
expect(((typeArgs[1] as NamedType).name as SimpleIdentifier).name, 'b');
}
void test_methodTearoff() {
var functionReference = parseExpression('f().m<a, b>') as FunctionReference;
var function = functionReference.function as PropertyAccess;
var target = function.target as MethodInvocation;
expect(target.methodName.name, 'f');
expect(function.propertyName.name, 'm');
var typeArgs = functionReference.typeArguments!.arguments;
expect(typeArgs, hasLength(2));
expect(((typeArgs[0] as NamedType).name as SimpleIdentifier).name, 'a');
expect(((typeArgs[1] as NamedType).name as SimpleIdentifier).name, 'b');
}
void test_methodTearoff_cascaded() {
var cascadeExpression =
parseExpression('f()..m<a, b>') as CascadeExpression;
var functionReference =
cascadeExpression.cascadeSections[0] as FunctionReference;
var function = functionReference.function as PropertyAccess;
expect(function.target, isNull);
expect(function.propertyName.name, 'm');
var typeArgs = functionReference.typeArguments!.arguments;
expect(typeArgs, hasLength(2));
expect(((typeArgs[0] as NamedType).name as SimpleIdentifier).name, 'a');
expect(((typeArgs[1] as NamedType).name as SimpleIdentifier).name, 'b');
}
void test_prefixedIdentifier() {
var functionReference =
parseExpression('prefix.f<a, b>') as FunctionReference;
var function = functionReference.function as PrefixedIdentifier;
expect(function.prefix.name, 'prefix');
expect(function.identifier.name, 'f');
var typeArgs = functionReference.typeArguments!.arguments;
expect(typeArgs, hasLength(2));
expect(((typeArgs[0] as NamedType).name as SimpleIdentifier).name, 'a');
expect(((typeArgs[1] as NamedType).name as SimpleIdentifier).name, 'b');
}
void test_three_identifiers() {
var functionReference =
parseExpression('prefix.ClassName.m<a, b>') as FunctionReference;
var function = functionReference.function as PropertyAccess;
var target = function.target as PrefixedIdentifier;
expect(target.prefix.name, 'prefix');
expect(target.identifier.name, 'ClassName');
expect(function.propertyName.name, 'm');
var typeArgs = functionReference.typeArguments!.arguments;
expect(typeArgs, hasLength(2));
expect(((typeArgs[0] as NamedType).name as SimpleIdentifier).name, 'a');
expect(((typeArgs[1] as NamedType).name as SimpleIdentifier).name, 'b');
}
}