TwineTest.cpp
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//===- TwineTest.cpp - Twine unit tests -----------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/Twine.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/FormatAdapters.h"
#include "llvm/Support/FormatVariadic.h"
#include "llvm/Support/raw_ostream.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
std::string repr(const Twine &Value) {
std::string res;
llvm::raw_string_ostream OS(res);
Value.printRepr(OS);
return OS.str();
}
TEST(TwineTest, Construction) {
EXPECT_EQ("", Twine().str());
EXPECT_EQ("hi", Twine("hi").str());
EXPECT_EQ("hi", Twine(std::string("hi")).str());
EXPECT_EQ("hi", Twine(StringRef("hi")).str());
EXPECT_EQ("hi", Twine(StringRef(std::string("hi"))).str());
EXPECT_EQ("hi", Twine(StringRef("hithere", 2)).str());
EXPECT_EQ("hi", Twine(SmallString<4>("hi")).str());
EXPECT_EQ("hi", Twine(formatv("{0}", "hi")).str());
}
TEST(TwineTest, Numbers) {
EXPECT_EQ("123", Twine(123U).str());
EXPECT_EQ("123", Twine(123).str());
EXPECT_EQ("-123", Twine(-123).str());
EXPECT_EQ("123", Twine(123).str());
EXPECT_EQ("-123", Twine(-123).str());
EXPECT_EQ("7b", Twine::utohexstr(123).str());
}
TEST(TwineTest, Characters) {
EXPECT_EQ("x", Twine('x').str());
EXPECT_EQ("x", Twine(static_cast<unsigned char>('x')).str());
EXPECT_EQ("x", Twine(static_cast<signed char>('x')).str());
}
TEST(TwineTest, Concat) {
// Check verse repr, since we care about the actual representation not just
// the result.
// Concat with null.
EXPECT_EQ("(Twine null empty)",
repr(Twine("hi").concat(Twine::createNull())));
EXPECT_EQ("(Twine null empty)",
repr(Twine::createNull().concat(Twine("hi"))));
// Concat with empty.
EXPECT_EQ("(Twine cstring:\"hi\" empty)",
repr(Twine("hi").concat(Twine())));
EXPECT_EQ("(Twine cstring:\"hi\" empty)",
repr(Twine().concat(Twine("hi"))));
EXPECT_EQ("(Twine smallstring:\"hi\" empty)",
repr(Twine().concat(Twine(SmallString<5>("hi")))));
EXPECT_EQ("(Twine formatv:\"howdy\" empty)",
repr(Twine(formatv("howdy")).concat(Twine())));
EXPECT_EQ("(Twine formatv:\"howdy\" empty)",
repr(Twine().concat(Twine(formatv("howdy")))));
EXPECT_EQ("(Twine smallstring:\"hey\" cstring:\"there\")",
repr(Twine(SmallString<7>("hey")).concat(Twine("there"))));
// Concatenation of unary ropes.
EXPECT_EQ("(Twine cstring:\"a\" cstring:\"b\")",
repr(Twine("a").concat(Twine("b"))));
// Concatenation of other ropes.
EXPECT_EQ("(Twine rope:(Twine cstring:\"a\" cstring:\"b\") cstring:\"c\")",
repr(Twine("a").concat(Twine("b")).concat(Twine("c"))));
EXPECT_EQ("(Twine cstring:\"a\" rope:(Twine cstring:\"b\" cstring:\"c\"))",
repr(Twine("a").concat(Twine("b").concat(Twine("c")))));
EXPECT_EQ("(Twine cstring:\"a\" rope:(Twine smallstring:\"b\" cstring:\"c\"))",
repr(Twine("a").concat(Twine(SmallString<3>("b")).concat(Twine("c")))));
}
TEST(TwineTest, toNullTerminatedStringRef) {
SmallString<8> storage;
EXPECT_EQ(0, *Twine("hello").toNullTerminatedStringRef(storage).end());
EXPECT_EQ(0,
*Twine(StringRef("hello")).toNullTerminatedStringRef(storage).end());
EXPECT_EQ(0, *Twine(SmallString<11>("hello"))
.toNullTerminatedStringRef(storage)
.end());
EXPECT_EQ(0, *Twine(formatv("{0}{1}", "how", "dy"))
.toNullTerminatedStringRef(storage)
.end());
}
TEST(TwineTest, LazyEvaluation) {
struct formatter : FormatAdapter<int> {
explicit formatter(int &Count) : FormatAdapter(0), Count(Count) {}
int &Count;
void format(raw_ostream &OS, StringRef Style) { ++Count; }
};
int Count = 0;
formatter Formatter(Count);
(void)Twine(formatv("{0}", Formatter));
EXPECT_EQ(0, Count);
(void)Twine(formatv("{0}", Formatter)).str();
EXPECT_EQ(1, Count);
}
// I suppose linking in the entire code generator to add a unit test to check
// the code size of the concat operation is overkill... :)
} // end anonymous namespace