blob: 12afe4e332a63688c9cfc91536af26f0e5e6c7cd [file] [log] [blame]
// Copyright (c) 2017, 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:convert';
import 'dart:typed_data' show Uint8List;
import 'package:_fe_analyzer_shared/src/scanner/error_token.dart' as fasta;
import 'package:_fe_analyzer_shared/src/scanner/errors.dart';
import 'package:_fe_analyzer_shared/src/scanner/scanner.dart'
as usedForFuzzTesting;
import 'package:_fe_analyzer_shared/src/scanner/scanner.dart';
import 'package:_fe_analyzer_shared/src/scanner/token.dart' as fasta;
import 'package:_fe_analyzer_shared/src/scanner/token.dart';
import 'package:_fe_analyzer_shared/src/scanner/token_constants.dart' as fasta;
import 'package:front_end/src/codes/cfe_codes.dart';
import 'package:test/test.dart';
import 'package:test_reflective_loader/test_reflective_loader.dart';
import 'scanner_test.dart';
void main() {
defineReflectiveSuite(() {
defineReflectiveTests(ScannerTest_Fasta);
defineReflectiveTests(ScannerTest_Fasta_FuzzTestAPI);
defineReflectiveTests(ScannerTest_Fasta_UTF8);
defineReflectiveTests(ScannerTest_Fasta_Direct);
defineReflectiveTests(ScannerTest_Fasta_Direct_UTF8);
});
}
Uint8List encodeAsNullTerminatedUtf8(String source) {
final sourceBytes = utf8.encode(source);
return Uint8List(sourceBytes.length + 1)
..setRange(0, sourceBytes.length, sourceBytes);
}
@reflectiveTest
class ScannerTest_Fasta_FuzzTestAPI {
void test_API() {
// These two API are used when fuzz testing the scanner.
String source = 'class A { }';
usedForFuzzTesting.ScannerResult result =
usedForFuzzTesting.scanString(source);
expect(result.hasErrors, isFalse);
expect(result.tokens.type, same(Keyword.CLASS));
// UTF8 encode source with trailing zero
Uint8List bytes = encodeAsNullTerminatedUtf8(source);
result = usedForFuzzTesting.scan(bytes);
expect(result.hasErrors, isFalse);
expect(result.tokens.type, same(Keyword.CLASS));
}
}
@reflectiveTest
class ScannerTest_Fasta_UTF8 extends ScannerTest_Fasta {
@override
Token scanWithListener(String source, ErrorListener listener,
{ScannerConfiguration? configuration}) {
var bytes = encodeAsNullTerminatedUtf8(source);
var result =
scan(bytes, configuration: configuration, includeComments: true);
var token = result.tokens;
// Translate error tokens
if (result.hasErrors) {
while (token is ErrorToken) {
translateErrorToken(token,
(ScannerErrorCode errorCode, int offset, List<Object>? arguments) {
listener.errors.add(new TestError(offset, errorCode, arguments));
});
token = token.next!;
}
}
new Token.eof(-1)..setNext(token);
return token;
}
void test_invalid_utf8() {
void printBytes(Uint8List bytes) {
var hex = bytes.map((b) => '0x${b.toRadixString(16).toUpperCase()}');
print('$bytes\n[${hex.join(', ')}]');
try {
utf8.decode(bytes);
} catch (e) {
// Bad UTF-8 encoding
print(' This is invalid UTF-8, but scanner should not crash.');
}
}
ScannerResult scanBytes(Uint8List bytes) {
try {
return usedForFuzzTesting.scan(bytes);
} catch (e) {
print('Failed scanning bytes:');
printBytes(bytes);
rethrow;
}
}
for (int byte0 = 1; byte0 <= 0xFF; ++byte0) {
Uint8List bytes = Uint8List(2)..[0] = byte0;
scanBytes(bytes);
for (int byte1 = 1; byte1 <= 0xFF; ++byte1) {
Uint8List bytes = Uint8List(3)
..[0] = byte0
..[1] = byte1;
scanBytes(bytes);
}
}
}
}
@reflectiveTest
class ScannerTest_Fasta extends ScannerTestBase {
@override
Token scanWithListener(String source, ErrorListener listener,
{ScannerConfiguration? configuration}) {
var result =
scanString(source, configuration: configuration, includeComments: true);
var token = result.tokens;
// Translate error tokens
if (result.hasErrors) {
while (token is ErrorToken) {
translateErrorToken(token,
(ScannerErrorCode errorCode, int offset, List<Object>? arguments) {
listener.errors.add(new TestError(offset, errorCode, arguments));
});
token = token.next!;
}
}
new Token.eof(-1)..setNext(token);
return token;
}
void test_comments() {
const source = '''
/// Doc comment before class
/// second line
/// third
class Foo {
// Random comment
Object someField; // trailing comment
dynamic secondField;
/// Method doc
void someMethod(/* comment before closing paren */) {
// body comment
}
/** Doc comment 2 */
Foo2 bar() => new Baz();
} // EOF comment
''';
Token scanSource({required bool includeComments}) {
return scanString(source, includeComments: includeComments).tokens;
}
int tokenCount = 0;
Token token = scanSource(includeComments: false);
while (!token.isEof) {
++tokenCount;
// Assert no comments
expect(token.precedingComments, isNull);
expect(token.type.kind, isNot(fasta.COMMENT_TOKEN));
token = token.next!;
}
expect(token.precedingComments, isNull);
expect(tokenCount, 26);
tokenCount = 0;
int previousEnd = 0;
int spotCheckCount = 0;
int commentTokenCount = 0;
token = scanSource(includeComments: true);
while (!token.isEof) {
++tokenCount;
// Assert valid comments
fasta.CommentToken? comment = token.precedingComments;
while (comment != null) {
++commentTokenCount;
expect(comment.type.kind, fasta.COMMENT_TOKEN);
expect(comment.charOffset, greaterThanOrEqualTo(previousEnd));
previousEnd = comment.charOffset + comment.charCount;
comment = comment.next as fasta.CommentToken?;
}
expect(token.type.kind, isNot(fasta.COMMENT_TOKEN));
expect(token.charOffset, greaterThanOrEqualTo(previousEnd));
previousEnd = token.charOffset + token.charCount;
// Spot check for specific token/comment combinations
if (token.lexeme == 'class') {
++spotCheckCount;
expect(token.precedingComments?.lexeme, '/// Doc comment before class');
expect(token.precedingComments?.next?.lexeme, '/// second line');
expect(token.precedingComments?.next?.next?.lexeme, '/// third');
expect(token.precedingComments?.next?.next?.next, isNull);
} else if (token.lexeme == 'Foo2') {
++spotCheckCount;
expect(token.precedingComments?.lexeme, '/** Doc comment 2 */');
} else if (token.lexeme == ')') {
if (token.precedingComments != null) {
++spotCheckCount;
expect(token.precedingComments?.lexeme,
'/* comment before closing paren */');
expect(token.precedingComments?.next, isNull);
}
}
token = token.next!;
}
expect(tokenCount, 26);
expect(spotCheckCount, 3);
expect(commentTokenCount, 9);
expect(token.precedingComments?.lexeme, '// EOF comment');
}
void test_double_error() {
String source = "3457e";
ErrorListener listener = new ErrorListener();
Token token = scanWithListener(source, listener);
expect(token, isNotNull);
expect(token.type, TokenType.DOUBLE);
expect(token.offset, 0);
expect(token.isSynthetic, isTrue);
// the invalid token is updated to be valid ...
expect(token.lexeme, source + "0");
// ... but the length does *not* include the additional character
// so as to be true to the original source.
expect(token.length, source.length);
expect(token.next!.isEof, isTrue);
expect(listener.errors, hasLength(1));
TestError error = listener.errors[0];
expect(error.errorCode, ScannerErrorCode.MISSING_DIGIT);
expect(error.offset, source.length - 1);
}
@override
void test_mismatched_opener_in_interpolation() {
// When openers and closers are mismatched,
// fasta favors considering the opener to be mismatched
// and inserts synthetic closers as needed.
// r'"${({(}}"' is parsed as r'"${({()})}"'
// where both ')' are synthetic
ErrorListener listener = new ErrorListener();
BeginToken interpolationStart =
scanWithListener(r'"${({(}}"', listener).next as BeginToken;
BeginToken openParen1 = interpolationStart.next as BeginToken;
BeginToken openBrace = openParen1.next as BeginToken;
BeginToken openParen2 = openBrace.next as BeginToken;
var closeParen2 = openParen2.next!;
var closeBrace = closeParen2.next!;
var closeParen1 = closeBrace.next!;
var interpolationEnd = closeParen1.next!;
var stringEnd = interpolationEnd.next!;
expect(stringEnd.next!.type, TokenType.EOF);
expect(interpolationStart.endToken, same(interpolationEnd));
expect(openParen1.endToken, same(closeParen1));
expect(openBrace.endToken, same(closeBrace));
expect(openParen2.endToken, same(closeParen2));
listener.assertErrors([
new TestError(6, ScannerErrorCode.EXPECTED_TOKEN, [')']),
new TestError(7, ScannerErrorCode.EXPECTED_TOKEN, [')']),
]);
}
void test_next_previous() {
const source = 'int a; /*1*/ /*2*/ /*3*/ B f(){if (a < 2) {}}';
Token token = scanString(source, includeComments: true).tokens;
while (!token.isEof) {
expect(token.next!.previous, token);
fasta.CommentToken? commentToken = token.precedingComments;
while (commentToken != null) {
if (commentToken.next != null) {
expect(commentToken.next!.previous, commentToken);
}
commentToken = commentToken.next as fasta.CommentToken?;
}
token = token.next!;
}
}
void test_spread_operators() {
ErrorListener listener = new ErrorListener();
Token openBracket = scanWithListener('[ 1, ...[2], ...?[3], ]', listener);
Token spreadToken = openBracket.next!.next!.next!;
expect(spreadToken.lexeme, '...');
Token spreadQToken = spreadToken.next!.next!.next!.next!.next!;
expect(spreadQToken.lexeme, '...?');
}
@override
void test_unmatched_openers() {
ErrorListener listener = new ErrorListener();
BeginToken openBrace = scanWithListener('{[(', listener) as BeginToken;
BeginToken openBracket = openBrace.next as BeginToken;
BeginToken openParen = openBracket.next as BeginToken;
var closeParen = openParen.next!;
var closeBracket = closeParen.next!;
var closeBrace = closeBracket.next!;
expect(closeBrace.next!.type, TokenType.EOF);
expect(openBrace.endToken, same(closeBrace));
expect(openBracket.endToken, same(closeBracket));
expect(openParen.endToken, same(closeParen));
listener.assertErrors([
new TestError(3, ScannerErrorCode.EXPECTED_TOKEN, ['}']),
new TestError(3, ScannerErrorCode.EXPECTED_TOKEN, [']']),
new TestError(3, ScannerErrorCode.EXPECTED_TOKEN, [')']),
]);
}
}
/// Base class for scanner tests that examine the token stream in Fasta format.
abstract class ScannerTest_Fasta_Base {
Token scan(String source, {bool? enableTripleShift});
void expectToken(Token token, TokenType type, int offset, int length,
{bool isSynthetic = false, String? lexeme}) {
String description = '${token.type} $token';
expect(token.type, type, reason: description);
expect(token.offset, offset, reason: description);
expect(token.length, length, reason: description);
expect(token.isSynthetic, isSynthetic, reason: description);
if (lexeme != null) {
expect(token.lexeme, lexeme, reason: description);
}
}
void test_string_simple_interpolation_missingIdentifier() {
Token token = scan("'\$x\$'");
expect((token as fasta.ErrorToken).errorCode,
same(codeUnexpectedDollarInString));
token = token.next!;
expectToken(token, TokenType.STRING, 0, 1, lexeme: "'");
token = token.next!;
expectToken(token, TokenType.STRING_INTERPOLATION_IDENTIFIER, 1, 1);
token = token.next!;
expectToken(token, TokenType.IDENTIFIER, 2, 1, lexeme: 'x');
token = token.next!;
expectToken(token, TokenType.STRING, 3, 0, lexeme: '', isSynthetic: true);
token = token.next!;
expectToken(token, TokenType.STRING_INTERPOLATION_IDENTIFIER, 3, 1);
token = token.next!;
expectToken(token, TokenType.IDENTIFIER, 4, 0,
lexeme: '', isSynthetic: true);
token = token.next!;
expectToken(token, TokenType.STRING, 4, 1, lexeme: "'");
}
void test_string_simple_unterminated_interpolation_block() {
Token token = scan(r'"foo ${bar');
expect((token as fasta.ErrorToken).errorCode, same(codeUnmatchedToken));
var interpolationStartErrorToken = token as fasta.UnmatchedToken;
token = token.next!;
expect((token as fasta.ErrorToken).errorCode, same(codeUnterminatedString));
expect((token as fasta.UnterminatedString).start, '"');
token = token.next!;
expectToken(token, TokenType.STRING, 0, 5, lexeme: '"foo ');
token = token.next!;
expectToken(token, TokenType.STRING_INTERPOLATION_EXPRESSION, 5, 2);
BeginToken interpolationStart = token as BeginToken;
expect(interpolationStartErrorToken.begin, same(interpolationStart));
token = token.next!;
expectToken(token, TokenType.IDENTIFIER, 7, 3, lexeme: 'bar');
// Expect interpolation to be terminated before string is closed
token = token.next!;
expectToken(token, TokenType.CLOSE_CURLY_BRACKET, 10, 0,
isSynthetic: true, lexeme: '}');
expect(interpolationStart.endToken, same(token));
token = token.next!;
expectToken(token, TokenType.STRING, 10, 0, isSynthetic: true, lexeme: '"');
}
void test_string_simple_unterminated_interpolation_block2() {
Token token = scan(r'"foo ${bar(baz[');
expect((token as fasta.ErrorToken).errorCode, same(codeUnmatchedToken));
var openSquareBracketErrorToken = token as fasta.UnmatchedToken;
token = token.next!;
expect((token as fasta.ErrorToken).errorCode, same(codeUnmatchedToken));
var openParenErrorToken = token as fasta.UnmatchedToken;
token = token.next!;
expect((token as fasta.ErrorToken).errorCode, same(codeUnmatchedToken));
var interpolationStartErrorToken = token as fasta.UnmatchedToken;
token = token.next!;
expect((token as fasta.ErrorToken).errorCode, same(codeUnterminatedString));
expect((token as fasta.UnterminatedString).start, '"');
token = token.next!;
expectToken(token, TokenType.STRING, 0, 5, lexeme: '"foo ');
token = token.next!;
expectToken(token, TokenType.STRING_INTERPOLATION_EXPRESSION, 5, 2);
BeginToken interpolationStart = token as BeginToken;
expect(interpolationStartErrorToken.begin, same(interpolationStart));
token = token.next!;
expectToken(token, TokenType.IDENTIFIER, 7, 3, lexeme: 'bar');
token = token.next!;
expectToken(token, TokenType.OPEN_PAREN, 10, 1);
BeginToken openParen = token as BeginToken;
expect(openParenErrorToken.begin, same(openParen));
token = token.next!;
expectToken(token, TokenType.IDENTIFIER, 11, 3, lexeme: 'baz');
token = token.next!;
expectToken(token, TokenType.OPEN_SQUARE_BRACKET, 14, 1);
BeginToken openSquareBracket = token as BeginToken;
expect(openSquareBracketErrorToken.begin, same(openSquareBracket));
token = token.next!;
expectToken(token, TokenType.CLOSE_SQUARE_BRACKET, 15, 0,
isSynthetic: true, lexeme: ']');
expect(openSquareBracket.endToken, same(token));
token = token.next!;
expectToken(token, TokenType.CLOSE_PAREN, 15, 0,
isSynthetic: true, lexeme: ')');
expect(openParen.endToken, same(token));
token = token.next!;
expectToken(token, TokenType.CLOSE_CURLY_BRACKET, 15, 0,
isSynthetic: true, lexeme: '}');
expect(interpolationStart.endToken, same(token));
token = token.next!;
expectToken(token, TokenType.STRING, 15, 0, isSynthetic: true, lexeme: '"');
}
void test_string_simple_missing_interpolation_identifier() {
Token token = scan(r'"foo $');
expect((token as fasta.ErrorToken).errorCode,
same(codeUnexpectedDollarInString));
token = token.next!;
expect((token as fasta.ErrorToken).errorCode, same(codeUnterminatedString));
expect((token as fasta.UnterminatedString).start, '"');
token = token.next!;
expectToken(token, TokenType.STRING, 0, 5, lexeme: '"foo ');
token = token.next!;
expectToken(token, TokenType.STRING_INTERPOLATION_IDENTIFIER, 5, 1);
token = token.next!;
expectToken(token, TokenType.IDENTIFIER, 6, 0,
isSynthetic: true, lexeme: '');
token = token.next!;
expectToken(token, TokenType.STRING, 6, 0, isSynthetic: true, lexeme: '"');
}
void test_string_multi_unterminated() {
Token token = scan("'''string");
expect((token as fasta.ErrorToken).errorCode, same(codeUnterminatedString));
expect((token as fasta.UnterminatedString).start, "'''");
token = token.next!;
expectToken(token, TokenType.STRING, 0, 9,
lexeme: "'''string'''", isSynthetic: true);
}
void test_string_raw_multi_unterminated() {
Token token = scan("r'''string");
expect((token as fasta.ErrorToken).errorCode, same(codeUnterminatedString));
expect((token as fasta.UnterminatedString).start, "r'''");
token = token.next!;
expectToken(token, TokenType.STRING, 0, 10,
lexeme: "r'''string'''", isSynthetic: true);
}
void test_string_raw_simple_unterminated_eof() {
Token token = scan("r'string");
expect((token as fasta.ErrorToken).errorCode, same(codeUnterminatedString));
expect((token as fasta.UnterminatedString).start, "r'");
token = token.next!;
expectToken(token, TokenType.STRING, 0, 8,
lexeme: "r'string'", isSynthetic: true);
}
void test_string_raw_simple_unterminated_eol() {
Token token = scan("r'string\n");
expect((token as fasta.ErrorToken).errorCode, same(codeUnterminatedString));
expect((token as fasta.UnterminatedString).start, "r'");
token = token.next!;
expectToken(token, TokenType.STRING, 0, 8,
lexeme: "r'string'", isSynthetic: true);
}
void test_string_simple_unterminated_eof() {
Token token = scan("'string");
expect((token as fasta.ErrorToken).errorCode, same(codeUnterminatedString));
expect((token as fasta.UnterminatedString).start, "'");
token = token.next!;
expectToken(token, TokenType.STRING, 0, 7,
lexeme: "'string'", isSynthetic: true);
}
void test_string_simple_unterminated_eol() {
Token token = scan("'string\n");
expect((token as fasta.ErrorToken).errorCode, same(codeUnterminatedString));
expect((token as fasta.UnterminatedString).start, "'");
token = token.next!;
expectToken(token, TokenType.STRING, 0, 7,
lexeme: "'string'", isSynthetic: true);
}
void test_match_angle_brackets() {
var x = scan('x<y>');
BeginToken lessThan = x.next as BeginToken;
var y = lessThan.next!;
var greaterThan = y.next!;
expect(greaterThan.next!.isEof, isTrue);
expect(lessThan.endGroup, same(greaterThan));
}
void test_match_angle_brackets_gt_gt() {
// When a ">>" appears in the token stream, Fasta's scanner matches it to
// the outer "<". The inner "<" is left unmatched.
var x = scan('x<y<z>>');
BeginToken lessThan1 = x.next as BeginToken;
var y = lessThan1.next!;
BeginToken lessThan2 = y.next as BeginToken;
var z = lessThan2.next!;
var greaterThans = z.next!;
expect(greaterThans.next!.isEof, isTrue);
expect(lessThan1.endGroup, same(greaterThans));
expect(lessThan2.endGroup, isNull);
}
void test_match_angle_brackets_gt_gt_gt() {
// When a ">>>" appears in the token stream, Fasta's scanner matches it to
// the outer "<". The inner "<" are left unmatched.
var a = scan('a<b<c<d>>>', enableTripleShift: true);
BeginToken lessThan1 = a.next as BeginToken;
var b = lessThan1.next!;
BeginToken lessThan2 = b.next as BeginToken;
var c = lessThan2.next!;
BeginToken lessThan3 = c.next as BeginToken;
var d = lessThan3.next!;
var greaterThans = d.next!;
expect(greaterThans.next!.isEof, isTrue);
expect(lessThan1.endGroup, same(greaterThans));
expect(lessThan2.endGroup, isNull);
expect(lessThan3.endGroup, isNull);
}
void test_match_angle_brackets_interrupted_by_close_brace() {
// A "}" appearing in the token stream interrupts matching of "<" and ">".
BeginToken openBrace = scan('{x<y}>z') as BeginToken;
var x = openBrace.next!;
BeginToken lessThan = x.next as BeginToken;
var y = lessThan.next!;
var closeBrace = y.next!;
var greaterThan = closeBrace.next!;
var z = greaterThan.next!;
expect(z.next!.isEof, isTrue);
expect(openBrace.endGroup, same(closeBrace));
expect(lessThan.endGroup, isNull);
}
void test_match_angle_brackets_interrupted_by_close_bracket() {
// A "]" appearing in the token stream interrupts matching of "<" and ">".
BeginToken openBracket = scan('[x<y]>z') as BeginToken;
var x = openBracket.next!;
BeginToken lessThan = x.next as BeginToken;
var y = lessThan.next!;
var closeBracket = y.next!;
var greaterThan = closeBracket.next!;
var z = greaterThan.next!;
expect(z.next!.isEof, isTrue);
expect(openBracket.endGroup, same(closeBracket));
expect(lessThan.endGroup, isNull);
}
void test_match_angle_brackets_interrupted_by_close_paren() {
// A ")" appearing in the token stream interrupts matching of "<" and ">".
BeginToken openParen = scan('(x<y)>z') as BeginToken;
var x = openParen.next!;
BeginToken lessThan = x.next as BeginToken;
var y = lessThan.next!;
var closeParen = y.next!;
var greaterThan = closeParen.next!;
var z = greaterThan.next!;
expect(z.next!.isEof, isTrue);
expect(openParen.endGroup, same(closeParen));
expect(lessThan.endGroup, isNull);
}
void test_match_angle_brackets_interrupted_by_interpolation_expr() {
// A "${" appearing in the token stream interrupts matching of "<" and ">".
var x = scan(r'x<"${y>z}"');
BeginToken lessThan = x.next as BeginToken;
var beginString = lessThan.next!;
BeginToken beginInterpolation = beginString.next as BeginToken;
var y = beginInterpolation.next!;
var greaterThan = y.next!;
var z = greaterThan.next!;
var endInterpolation = z.next!;
var endString = endInterpolation.next!;
expect(endString.next!.isEof, isTrue);
expect(lessThan.endGroup, isNull);
expect(beginInterpolation.endGroup, same(endInterpolation));
}
void test_match_angle_brackets_interrupted_by_open_brace() {
// A "{" appearing in the token stream interrupts matching of "<" and ">".
var x = scan('x<{y>z}');
BeginToken lessThan = x.next as BeginToken;
BeginToken openBrace = lessThan.next as BeginToken;
var y = openBrace.next!;
var greaterThan = y.next!;
var z = greaterThan.next!;
var closeBrace = z.next!;
expect(closeBrace.next!.isEof, isTrue);
expect(lessThan.endGroup, isNull);
expect(openBrace.endGroup, same(closeBrace));
}
void test_match_angle_brackets_interrupted_by_open_bracket() {
// A "[" appearing in the token stream interrupts matching of "<" and ">".
var x = scan('x<y[z>a]');
BeginToken lessThan = x.next as BeginToken;
var y = lessThan.next!;
BeginToken openBracket = y.next as BeginToken;
var z = openBracket.next!;
var greaterThan = z.next!;
var a = greaterThan.next!;
var closeBracket = a.next!;
expect(closeBracket.next!.isEof, isTrue);
expect(lessThan.endGroup, isNull);
expect(openBracket.endGroup, same(closeBracket));
}
void test_match_angle_brackets_interrupted_by_open_paren() {
// A "(" appearing in the token stream interrupts matching of "<" and ">".
var x = scan('x<y(z>a)');
BeginToken lessThan = x.next as BeginToken;
var y = lessThan.next!;
BeginToken openParen = y.next as BeginToken;
var z = openParen.next!;
var greaterThan = z.next!;
var a = greaterThan.next!;
var closeParen = a.next!;
expect(closeParen.next!.isEof, isTrue);
expect(lessThan.endGroup, isNull);
expect(openParen.endGroup, same(closeParen));
}
void test_match_angle_brackets_nested() {
var x = scan('x<y<z>,a>');
BeginToken lessThan1 = x.next as BeginToken;
var y = lessThan1.next!;
BeginToken lessThan2 = y.next as BeginToken;
var z = lessThan2.next!;
var greaterThan1 = z.next!;
var comma = greaterThan1.next!;
var a = comma.next!;
var greaterThan2 = a.next!;
expect(greaterThan2.next!.isEof, isTrue);
expect(lessThan1.endGroup, same(greaterThan2));
expect(lessThan2.endGroup, same(greaterThan1));
}
void test_match_angle_brackets_unmatched_gt_gt() {
// When a ">>" appears in the token stream and there is no outer "<",
// Fasta's scanner leaves the inner "<" unmatched.
var x = scan('x<y>>z');
BeginToken lessThan = x.next as BeginToken;
var y = lessThan.next!;
var greaterThans = y.next!;
var z = greaterThans.next!;
expect(z.next!.isEof, isTrue);
expect(lessThan.endGroup, isNull);
}
}
/// Scanner tests that exercise the Fasta scanner directly.
@reflectiveTest
class ScannerTest_Fasta_Direct_UTF8 extends ScannerTest_Fasta_Direct {
@override
ScannerResult scanSource(source,
{bool includeComments = true, bool? enableTripleShift}) {
Uint8List encoded = encodeAsNullTerminatedUtf8(source);
ScannerConfiguration? configuration;
if (enableTripleShift == true) {
configuration = new ScannerConfiguration(enableTripleShift: true);
}
return usedForFuzzTesting.scan(encoded,
includeComments: includeComments,
configuration: configuration,
languageVersionChanged: languageVersionChanged);
}
}
/// Scanner tests that exercise the Fasta scanner directly.
@reflectiveTest
class ScannerTest_Fasta_Direct extends ScannerTest_Fasta_Base {
fasta.LanguageVersionToken? languageVersion;
void languageVersionChanged(
Scanner scanner, fasta.LanguageVersionToken languageVersion) {
this.languageVersion = languageVersion;
}
ScannerResult scanSource(source,
{bool includeComments = true, bool? enableTripleShift}) {
ScannerConfiguration? configuration;
if (enableTripleShift == true) {
configuration = new ScannerConfiguration(enableTripleShift: true);
}
return scanString(source,
includeComments: includeComments,
configuration: configuration,
languageVersionChanged: languageVersionChanged);
}
@override
Token scan(String source, {bool? enableTripleShift}) {
var result = scanSource(source,
includeComments: true, enableTripleShift: enableTripleShift);
final Token first = result.tokens;
Token token = first;
while (!token.isEof) {
Token next = token.next!;
expect(token.next, next);
expect(next.previous, token);
if (next.isSynthetic && [')', ']', '}'].contains(next.lexeme)) {
expect(next.beforeSynthetic, token);
}
token = next;
}
return first;
}
void test_languageVersion_afterImport() {
var result = scanSource('''
import 'foo.dart';
// @dart = 2.3
main() {}
''');
expect(languageVersion, isNull);
expectComments(result.tokens, [], -1);
}
void test_languageVersion_beforeComment() {
var result = scanSource('''
// some other comment
// @dart = 2.3
// yet another comment
import 'foo.dart';
main() {}
''');
expect(languageVersion!.major, 2);
expect(languageVersion!.minor, 3);
expectComments(
result.tokens,
[
'// some other comment',
'// @dart = 2.3',
'// yet another comment',
],
1);
}
void test_languageVersion_beforeFunction() {
var result = scanSource('''
// @dart = 2.3
main() {}
''');
expect(languageVersion!.major, 2);
expect(languageVersion!.minor, 3);
expectComments(result.tokens, ['// @dart = 2.3'], 0);
}
void test_languageVersion_beforeFunction_trailingX() {
var result = scanSource('''
// @dart = 2.3 x
main() {}
''');
expect(languageVersion, isNull);
expectComments(result.tokens, ['// @dart = 2.3 x'], -1);
}
void test_languageVersion_beforeFunction_noComments() {
var result = scanSource('''
// @dart = 2.3
main() {}
''', includeComments: false);
expect(languageVersion!.major, 2);
expect(languageVersion!.minor, 3);
expectComments(result.tokens, [], -1);
}
void test_languageVersion_beforeImport() {
var result = scanSource('''
// @dart = 2.3
import 'foo.dart';
main() {}
''');
expect(languageVersion!.major, 2);
expect(languageVersion!.minor, 3);
expectComments(result.tokens, ['// @dart = 2.3'], 0);
}
void test_languageVersion_beforeImport_afterScript() {
var result = scanSource('''
#!/bin/dart
// @dart = 2.3
import 'foo.dart';
main() {}
''');
expect(languageVersion!.major, 2);
expect(languageVersion!.minor, 3);
expectComments(result.tokens.next!, ['// @dart = 2.3'], 0);
}
void test_languageVersion_beforeLibrary() {
var result = scanSource('''
// @dart = 2.3
library foo;
main() {}
''');
expect(languageVersion!.major, 2);
expect(languageVersion!.minor, 3);
expectComments(result.tokens, ['// @dart = 2.3'], 0);
}
void test_languageVersion_beforeLibrary_noSpaces() {
var result = scanSource('''
// @dart=2.3
library foo;
main() {}
''');
expect(languageVersion!.major, 2);
expect(languageVersion!.minor, 3);
expectComments(result.tokens, ['// @dart=2.3'], 0);
}
void test_languageVersion_incomplete_version() {
var result = scanSource('''
// @dart = 2.
library foo;
main() {}
''');
expect(languageVersion, isNull);
expectComments(result.tokens, ['// @dart = 2.'], -1);
}
void test_languageVersion_invalid_identifier() {
var result = scanSource('''
// @dart = blat
library foo;
main() {}
''');
expect(languageVersion, isNull);
expectComments(result.tokens, ['// @dart = blat'], -1);
}
void test_languageVersion_invalid_version() {
var result = scanSource('''
// @dart = 2.x
library foo;
main() {}
''');
expect(languageVersion, isNull);
expectComments(result.tokens, ['// @dart = 2.x'], -1);
}
void test_linestarts() {
var result = scanSource("var\r\ni\n=\n1;\n");
var token = result.tokens;
expect(token.lexeme, 'var');
var lineStarts = result.lineStarts;
expect(lineStarts, orderedEquals([0, 5, 7, 9, 12, 13]));
}
void test_linestarts_synthetic_string() {
var result = scanSource("var\r\ns\n=\n'eh'\n'eh\n;\n");
var lineStarts = result.lineStarts;
expect(lineStarts, orderedEquals([0, 5, 7, 9, 14, 18, 20, 21]));
Token token = result.tokens;
expect(token.charOffset, 14, reason: 'error token : $token, ${token.type}');
expect(token.charCount, 3, reason: 'error token : $token, ${token.type}');
token = token.next!;
expect(token.lexeme, 'var');
int index = 0;
while (!token.isEof) {
expect(token.charOffset, lineStarts[index],
reason: 'token # $index : $token, ${token.type}');
++index;
token = token.next!;
}
}
void test_linestarts_synthetic_string_utf8() {
var result = scanSource("var\r\ns\n=\n'éh'\n'éh\n;\n");
var lineStarts = result.lineStarts;
expect(lineStarts, orderedEquals([0, 5, 7, 9, 14, 18, 20, 21]));
Token token = result.tokens;
expect(token, const TypeMatcher<ErrorToken>());
expect(token.charOffset, 14, reason: 'token # 0 : $token, ${token.type}');
token = token.next!;
expect(token.lexeme, 'var');
int index = 0;
while (!token.isEof) {
expect(token.charOffset, lineStarts[index],
reason: 'token # $index : $token, ${token.type}');
++index;
token = token.next!;
}
}
void expectComments(
Token? token, List<String> expectedComments, int versionIndex) {
int index = 0;
token = token!.precedingComments;
while (token != null) {
if (index == versionIndex) {
if (token is! fasta.LanguageVersionToken) {
fail('Expected version comment at index $index');
}
} else {
if (token is fasta.LanguageVersionToken) {
fail('Did not expect version comment at index $index');
}
}
if (index >= expectedComments.length) {
fail('Unexpected comment at index $index');
}
if (token is CommentToken) {
expect(token.lexeme, expectedComments[index],
reason: 'comment at $index');
} else {
fail('Expected comment token at index $index');
}
++index;
token = token.next;
}
expect(index, expectedComments.length, reason: 'unexpected comments');
}
}