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// 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 'package:front_end/src/fasta/fasta_codes.dart';
import 'package:front_end/src/fasta/scanner.dart' as usedForFuzzTesting;
import 'package:front_end/src/fasta/scanner.dart';
import 'package:front_end/src/fasta/scanner/error_token.dart' as fasta;
import 'package:front_end/src/fasta/scanner/string_scanner.dart' as fasta;
import 'package:front_end/src/fasta/scanner/token.dart' as fasta;
import 'package:front_end/src/fasta/scanner/token_constants.dart' as fasta;
import 'package:front_end/src/fasta/scanner/utf8_bytes_scanner.dart' as fasta;
import 'package:front_end/src/scanner/errors.dart';
import 'package:front_end/src/scanner/token.dart';
import 'package:test/test.dart';
import 'package:test_reflective_loader/test_reflective_loader.dart';
import 'scanner_test.dart';
main() {
defineReflectiveSuite(() {
defineReflectiveTests(ScannerTest_Fasta);
defineReflectiveTests(ScannerTest_Fasta_FuzzTestAPI);
defineReflectiveTests(ScannerTest_Fasta_UTF8);
defineReflectiveTests(ScannerTest_Fasta_Direct);
defineReflectiveTests(ScannerTest_Fasta_Direct_UTF8);
});
}
@reflectiveTest
class ScannerTest_Fasta_FuzzTestAPI {
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
List<int> bytes = utf8.encode(source).toList();
bytes.add(0);
result = usedForFuzzTesting.scan(bytes);
expect(result?.hasErrors, isFalse);
expect(result.tokens?.type, same(Keyword.CLASS));
}
}
@reflectiveTest
class ScannerTest_Fasta_UTF8 extends ScannerTest_Fasta {
test_invalid_utf8() {
printBytes(List<int> 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.');
}
}
scanBytes(List<int> bytes) {
try {
return usedForFuzzTesting.scan(bytes);
} catch (e) {
print('Failed scanning bytes:');
printBytes(bytes);
rethrow;
}
}
for (int byte0 = 1; byte0 <= 0xFF; ++byte0) {
for (int byte1 = 1; byte1 <= 0xFF; ++byte1) {
List<int> bytes = [byte0, byte1, 0];
scanBytes(bytes);
}
}
}
}
@reflectiveTest
class ScannerTest_Fasta extends ScannerTestBase {
@override
Token scanWithListener(String source, ErrorListener listener,
{bool lazyAssignmentOperators: false}) {
var result = scanString(source, 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({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;
}
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_CommentToken_remove() {
const code = '''
/// aaa
/// bbbb
/// ccccc
main() {}
''';
Token token;
fasta.CommentToken c1;
fasta.CommentToken c2;
fasta.CommentToken c3;
void prepareTokens() {
token = scanString(code, includeComments: true).tokens;
expect(token.type.kind, fasta.IDENTIFIER_TOKEN);
c1 = token.precedingComments;
c2 = c1.next;
c3 = c2.next;
expect(c3.next, isNull);
expect(c1.parent, token);
expect(c2.parent, token);
expect(c3.parent, token);
expect(c1.lexeme, '/// aaa');
expect(c2.lexeme, '/// bbbb');
expect(c3.lexeme, '/// ccccc');
}
// Remove the first token.
{
prepareTokens();
c1.remove();
expect(token.precedingComments, c2);
expect(c2.next, c3);
expect(c3.next, isNull);
}
// Remove the second token.
{
prepareTokens();
c2.remove();
expect(token.precedingComments, c1);
expect(c1.next, c3);
expect(c3.next, isNull);
}
// Remove the last token.
{
prepareTokens();
c3.remove();
expect(token.precedingComments, c1);
expect(c1.next, c2);
expect(c2.next, isNull);
}
}
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;
BeginToken openParen1 = interpolationStart.next;
BeginToken openBrace = openParen1.next;
BeginToken openParen2 = openBrace.next;
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;
}
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);
BeginToken openBracket = openBrace.next;
BeginToken openParen = openBracket.next;
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);
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;
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;
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;
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;
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;
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;
var y = lessThan1.next;
BeginToken lessThan2 = y.next;
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_interrupted_by_close_brace() {
// A "}" appearing in the token stream interrupts matching of "<" and ">".
BeginToken openBrace = scan('{x<y}>z');
var x = openBrace.next;
BeginToken lessThan = x.next;
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');
var x = openBracket.next;
BeginToken lessThan = x.next;
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');
var x = openParen.next;
BeginToken lessThan = x.next;
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;
var beginString = lessThan.next;
BeginToken beginInterpolation = beginString.next;
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;
BeginToken openBrace = lessThan.next;
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;
var y = lessThan.next;
BeginToken openBracket = y.next;
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;
var y = lessThan.next;
BeginToken openParen = y.next;
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;
var y = lessThan1.next;
BeginToken lessThan2 = y.next;
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;
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 {
ScannerResult scanSource(source, {includeComments: true}) {
List<int> encoded = utf8.encode(source).toList(growable: true);
encoded.add(0); // Ensure 0 terminted bytes for UTF8 scanner
return usedForFuzzTesting.scan(encoded, includeComments: includeComments);
}
}
/// Scanner tests that exercise the Fasta scanner directly.
@reflectiveTest
class ScannerTest_Fasta_Direct extends ScannerTest_Fasta_Base {
ScannerResult scanSource(source, {includeComments: true}) =>
scanString(source, includeComments: includeComments);
@override
Token scan(String source) {
var result = scanSource(source, includeComments: true);
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_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;
}
}
}