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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/strings/sys_string_conversions.h"
#import "testing/gtest_mac.h"
#include "testing/platform_test.h"
#if !defined(__has_feature) || !__has_feature(objc_arc)
#error "This file requires ARC support."
#endif
// Chromium code relies on NSRegularExpression class to match regular
// expressions. Any subtle changes in behavior can lead to hard to diagnose
// problems. This files tests how NSRegularExpression handles various regular
// expression features.
namespace {
// Checks that capture groups from |testString| substituted into
// |templateString| matches |expected|.
void ExpectRegexMatched(NSRegularExpression* regex,
NSString* testString,
NSString* templateString,
NSString* expected) {
NSRange testRange = NSMakeRange(0, [testString length]);
NSString* outputString =
[regex stringByReplacingMatchesInString:testString
options:0
range:testRange
withTemplate:templateString];
EXPECT_TRUE(outputString && [outputString isEqualToString:expected])
<< "ExpectRegexMatched: '" << base::SysNSStringToUTF8(expected) << "' != "
<< (!outputString ? "(nil)"
: "'" + base::SysNSStringToUTF8(outputString) + "'");
}
// Checks that |testString| is not matched by |regex|.
void ExpectRegexNotMatched(NSRegularExpression* regex, NSString* testString) {
__block BOOL matched = NO;
NSRange testRange = NSMakeRange(0, [testString length]);
[regex enumerateMatchesInString:testString
options:0
range:testRange
usingBlock:^(NSTextCheckingResult* result,
NSMatchingFlags flags, BOOL* stop) {
if (NSEqualRanges([result range], testRange)) {
*stop = YES;
matched = YES;
}
}];
EXPECT_FALSE(matched) << "ExpectRegexNotMatched: '"
<< base::SysNSStringToUTF8(testString) << "' "
<< "pattern:"
<< base::SysNSStringToUTF8([regex pattern]);
}
// Returns an autoreleased NSRegularExpression object from the regular
// expression |pattern|.
NSRegularExpression* MakeRegularExpression(NSString* pattern) {
NSError* error = nil;
return [NSRegularExpression regularExpressionWithPattern:pattern
options:0
error:&error];
}
using NSRegularExpressionTest = PlatformTest;
TEST_F(NSRegularExpressionTest, TestSimpleRegex) {
NSRegularExpression* regex = MakeRegularExpression(@"foo(.*)bar(.*)");
ExpectRegexMatched(regex, @"fooONEbarTWO", @"first $1, second $2",
@"first ONE, second TWO");
}
TEST_F(NSRegularExpressionTest, TestComplexRegex) {
NSString* expression = @"^http[s]?://"
"(?:"
"(?:youtu\\.be/)|"
"(?:.*\\.youtube\\.com/watch\\?v=)|"
"(?:.*\\.youtube\\.com/index\\?)"
")"
"([^&]*)[\\&]?(?:.*)$";
NSString* templateString = @"vnd.youtube://$1";
NSString* expectedOutput = @"vnd.youtube://ndRXe3tTnsA";
NSRegularExpression* regex = MakeRegularExpression(expression);
ExpectRegexMatched(regex, @"http://youtu.be/ndRXe3tTnsA", templateString,
expectedOutput);
ExpectRegexMatched(regex, @"http://www.youtube.com/watch?v=ndRXe3tTnsA",
templateString, expectedOutput);
ExpectRegexNotMatched(regex, @"http://www.google.com");
ExpectRegexNotMatched(regex, @"http://www.youtube.com/embed/GkOZ8DfO248");
}
TEST_F(NSRegularExpressionTest, TestSimpleAlternation) {
// This test verifies how NSRegularExpression works.
// Regex 'ab|c' matches 'ab', 'ac', or 'c'. Does not match 'abc', 'a', or 'b'.
NSRegularExpression* regex = MakeRegularExpression(@"^ab|c$");
ExpectRegexMatched(regex, @"ab", @"$0", @"ab");
ExpectRegexMatched(regex, @"c", @"$0", @"c");
ExpectRegexMatched(regex, @"ac", @"$0", @"ac");
ExpectRegexNotMatched(regex, @"abc");
ExpectRegexNotMatched(regex, @"a");
ExpectRegexNotMatched(regex, @"b");
// Tests for '(?:ab)|(?:c)', which is slightly different from 'ab|c'.
regex = MakeRegularExpression(@"^(?:ab)|(?:c)$");
ExpectRegexMatched(regex, @"ab", @"$0", @"ab");
ExpectRegexMatched(regex, @"c", @"$0", @"c");
ExpectRegexNotMatched(regex, @"ac");
ExpectRegexNotMatched(regex, @"abc");
// This other regex: 'a(b|c)' matches either 'ab' or 'ac'.
regex = MakeRegularExpression(@"^a(?:b|c)$");
ExpectRegexMatched(regex, @"ab", @"$0", @"ab");
ExpectRegexMatched(regex, @"ac", @"$0", @"ac");
ExpectRegexNotMatched(regex, @"a");
ExpectRegexNotMatched(regex, @"abc");
}
TEST_F(NSRegularExpressionTest, TestUberCaptureGroup) {
// The absence of an uber-capture group caused NSRegularExpression to crash on
// iOS 5.x. This tests to make sure that it is not happening on iOS 6+
// environments.
NSRegularExpression* regex = MakeRegularExpression(@"^(ab|cd|ef)ghij$");
ExpectRegexMatched(regex, @"abghij", @"$0", @"abghij");
ExpectRegexMatched(regex, @"cdghij", @"$0", @"cdghij");
ExpectRegexMatched(regex, @"efghij", @"$0", @"efghij");
ExpectRegexNotMatched(regex, @"abcdefghij");
regex = MakeRegularExpression(@"^ab|cd|efghij$");
ExpectRegexMatched(regex, @"ab", @"$0", @"ab");
ExpectRegexMatched(regex, @"cd", @"$0", @"cd");
ExpectRegexMatched(regex, @"efghij", @"$0", @"efghij");
ExpectRegexNotMatched(regex, @"abcdefghij");
ExpectRegexNotMatched(regex, @"abghij");
ExpectRegexNotMatched(regex, @"cdghij");
}
} // namespace