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// Copyright (c) 2011, 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.
/// @assertion The production Assertion :: \ b evaluates by returning
/// an internal AssertionTester closure that takes a State argument x and
/// performs the following:
/// <ol>
/// <li>Let e be x's endIndex.</li>
/// <li>Call IsWordChar(e-1) and let a be the Boolean result.</li>
/// <li>Call IsWordChar(e) and let b be the Boolean result.</li>
/// <li>If a is true and b is false, return true.</li>
/// <li>If a is false and b is true, return true.</li>
/// <li>Return false. </li>
/// </ol>
/// The abstract operation IsWordChar(e) returns true if and only if its argument
/// is between -1 and InputLength (exclusive) and the input character at the
/// position specified by e is one of: latin letters (both cases), arabic
/// numerals or the underscore.
/// @description Checks that the \b assertion is interpreted correctly.
/// @3rdparty sputnik-v1:S15.10.2.6_A3_T1.js-S15.10.2.6_A3_T15.js
/// @author rodionov
import "../../../../Utils/expect.dart";
main() {
check(r"\bp", "pilot\nsoviet robot\topenoffice", matchPos: 0);
check(r"ot\b", "pilot\nsoviet robot\topenoffice", matchPos: 3);
checkNeg(r"\bot", "pilot\nsoviet robot\topenoffice");
check(r"\bso", "pilot\nsoviet robot\topenoffice", matchPos: 6);
checkNeg(r"so\b", "pilot\nsoviet robot\topenoffice");
check(r"[^o]t\b", "pilOt\nsoviet robot\topenoffice", matchPos: 3);
check(r"[^o]t\b", "pilOt\nsoviet robot\topenoffice", caseSensitive: false,
matchPos: 10);
check(r"\bro", "pilot\nsoviet robot\topenoffice", matchPos: 13);
checkNeg(r"r\b", "pilot\nsoviet robot\topenoffice");
check(r"\brobot\b", "pilot\nsoviet robot\topenoffice", matchPos: 13);
check(r"\b\w{5}\b", "pilot\nsoviet robot\topenoffice", matchPos: 0);
check(r"\bop", "pilot\nsoviet robot\topenoffice", matchPos: 19);
checkNeg(r"op\b", "pilot\nsoviet robot\topenoffice");
check(r"e\b", "pilot\nsoviet robot\topenoffic\u0065", matchPos: 28);
checkNeg(r"\be", "pilot\nsoviet robot\topenoffic\u0065");
void check(String pattern, String str, {bool multiLine: false,
bool caseSensitive: true, int matchPos: -1}) {
RegExp re = new RegExp(pattern, multiLine: multiLine,
caseSensitive: caseSensitive);
Match? fm = re.firstMatch(str);
Expect.isNotNull(fm, "\"$pattern\" !~ \"$str\"");
if(matchPos >= 0) {
Expect.equals(matchPos, fm?.start);
void checkNeg(String pattern, String str,
{bool multiLine: false, bool caseSensitive: true}) {
RegExp re = new RegExp(
pattern, multiLine: multiLine, caseSensitive: caseSensitive);
Expect.isNull(re.firstMatch(str), "\"$pattern\" ~ \"$str\"");