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AK: Add String starts_with(char) & ends_with(char)

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This is simply meant to be a more efficient implementation in the
case that we only need to check a single character.
This commit is contained in:
Shannon Booth 2020-02-15 13:04:00 +13:00 committed by Andreas Kling
parent 0e3a9d8e9d
commit 9920d17342
Notes: sideshowbarker 2024-07-19 09:19:24 +09:00 
Author: https://github.com/shannonbooth
Commit: https://github.com/SerenityOS/serenity/commit/9920d17342b
Pull-request: https://github.com/SerenityOS/serenity/pull/1222
3 changed files with 19 additions and 0 deletions
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13
AK/String.cpp
View file

@ -295,6 +295,13 @@ bool String::starts_with(const StringView& str) const
return !memcmp(characters(), str.characters_without_null_termination(), str.length()); return !memcmp(characters(), str.characters_without_null_termination(), str.length());
} }
bool String::starts_with(char ch) const
{
if (is_empty())
return false;
return characters()[0] == ch;
}
bool String::ends_with(const StringView& str) const bool String::ends_with(const StringView& str) const
{ {
if (str.is_empty()) if (str.is_empty())
@ -306,6 +313,12 @@ bool String::ends_with(const StringView& str) const
return !memcmp(characters() + (length() - str.length()), str.characters_without_null_termination(), str.length()); return !memcmp(characters() + (length() - str.length()), str.characters_without_null_termination(), str.length());
} }
bool String::ends_with(char ch) const
{
if (is_empty())
return false;
return characters()[length() - 1] == ch;
}
String String::repeated(char ch, size_t count) String String::repeated(char ch, size_t count)
{ {
if (!count) if (!count)

2
AK/String.h
View file

@ -157,6 +157,8 @@ public:
bool starts_with(const StringView&) const; bool starts_with(const StringView&) const;
bool ends_with(const StringView&) const; bool ends_with(const StringView&) const;
bool starts_with(char) const;
bool ends_with(char) const;
bool operator==(const String&) const; bool operator==(const String&) const;
bool operator!=(const String& other) const { return !(*this == other); } bool operator!=(const String& other) const { return !(*this == other); }

4
AK/Tests/TestString.cpp
View file

@ -80,6 +80,8 @@ TEST_CASE(starts_with)
{ {
String test_string = "ABCDEF"; String test_string = "ABCDEF";
EXPECT(test_string.starts_with("AB")); EXPECT(test_string.starts_with("AB"));
EXPECT(test_string.starts_with('A'));
EXPECT(!test_string.starts_with('B'));
EXPECT(test_string.starts_with("ABCDEF")); EXPECT(test_string.starts_with("ABCDEF"));
EXPECT(!test_string.starts_with("DEF")); EXPECT(!test_string.starts_with("DEF"));
} }
@ -88,6 +90,8 @@ TEST_CASE(ends_with)
{ {
String test_string = "ABCDEF"; String test_string = "ABCDEF";
EXPECT(test_string.ends_with("EF")); EXPECT(test_string.ends_with("EF"));
EXPECT(test_string.ends_with('F'));
EXPECT(!test_string.ends_with('E'));
EXPECT(test_string.ends_with("ABCDEF")); EXPECT(test_string.ends_with("ABCDEF"));
EXPECT(!test_string.ends_with("ABC")); EXPECT(!test_string.ends_with("ABC"));
} }