return substr(0, size()-N);
}
+ /// Returns true if this StringRef has the given prefix and removes that
+ /// prefix.
+ LLVM_ATTRIBUTE_ALWAYS_INLINE
+ LLVM_ATTRIBUTE_UNUSED_RESULT
+ bool consume_front(StringRef Prefix) {
+ if (!startswith(Prefix))
+ return false;
+
+ *this = drop_front(Prefix.size());
+ return true;
+ }
+
+ /// Returns true if this StringRef has the given suffix and removes that
+ /// suffix.
+ LLVM_ATTRIBUTE_ALWAYS_INLINE
+ LLVM_ATTRIBUTE_UNUSED_RESULT
+ bool consume_back(StringRef Suffix) {
+ if (!endswith(Suffix))
+ return false;
+
+ *this = drop_back(Suffix.size());
+ return true;
+ }
+
/// Return a reference to the substring from [Start, End).
///
/// \param Start The index of the starting character in the substring; if
EXPECT_FALSE(Str.startswith_lower("hi"));
}
+TEST(StringRefTest, ConsumeFront) {
+ StringRef Str("hello");
+ EXPECT_TRUE(Str.consume_front(""));
+ EXPECT_EQ("hello", Str);
+ EXPECT_TRUE(Str.consume_front("he"));
+ EXPECT_EQ("llo", Str);
+ EXPECT_FALSE(Str.consume_front("lloworld"));
+ EXPECT_EQ("llo", Str);
+ EXPECT_FALSE(Str.consume_front("lol"));
+ EXPECT_EQ("llo", Str);
+ EXPECT_TRUE(Str.consume_front("llo"));
+ EXPECT_EQ("", Str);
+ EXPECT_FALSE(Str.consume_front("o"));
+ EXPECT_TRUE(Str.consume_front(""));
+}
+
TEST(StringRefTest, EndsWith) {
StringRef Str("hello");
EXPECT_TRUE(Str.endswith(""));
EXPECT_FALSE(Str.endswith_lower("hi"));
}
+TEST(StringRefTest, ConsumeBack) {
+ StringRef Str("hello");
+ EXPECT_TRUE(Str.consume_back(""));
+ EXPECT_EQ("hello", Str);
+ EXPECT_TRUE(Str.consume_back("lo"));
+ EXPECT_EQ("hel", Str);
+ EXPECT_FALSE(Str.consume_back("helhel"));
+ EXPECT_EQ("hel", Str);
+ EXPECT_FALSE(Str.consume_back("hle"));
+ EXPECT_EQ("hel", Str);
+ EXPECT_TRUE(Str.consume_back("hel"));
+ EXPECT_EQ("", Str);
+ EXPECT_FALSE(Str.consume_back("h"));
+ EXPECT_TRUE(Str.consume_back(""));
+}
+
TEST(StringRefTest, Find) {
StringRef Str("hello");
EXPECT_EQ(2U, Str.find('l'));