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59049d1a79
With Twine now ubiquitous after rG92a79dbe91413f685ab19295fc7a6297dbd6c824, it needs support for string_view when building clang with newer C++ standards. This is similar to how StringRef is handled. Differential Revision: https://reviews.llvm.org/D103935
130 lines
4.6 KiB
C++
130 lines
4.6 KiB
C++
//===- TwineTest.cpp - Twine unit tests -----------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/Twine.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/Support/FormatAdapters.h"
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#include "llvm/Support/FormatVariadic.h"
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#include "llvm/Support/raw_ostream.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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namespace {
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std::string repr(const Twine &Value) {
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std::string res;
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llvm::raw_string_ostream OS(res);
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Value.printRepr(OS);
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return OS.str();
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}
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TEST(TwineTest, Construction) {
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EXPECT_EQ("", Twine().str());
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EXPECT_EQ("hi", Twine("hi").str());
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EXPECT_EQ("hi", Twine(std::string("hi")).str());
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EXPECT_EQ("hi", Twine(StringRef("hi")).str());
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EXPECT_EQ("hi", Twine(StringRef(std::string("hi"))).str());
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EXPECT_EQ("hi", Twine(StringRef("hithere", 2)).str());
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EXPECT_EQ("hi", Twine(SmallString<4>("hi")).str());
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EXPECT_EQ("hi", Twine(formatv("{0}", "hi")).str());
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#if __cplusplus > 201402L
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EXPECT_EQ("hi", Twine(std::string_view("hi")).str());
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#endif
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}
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TEST(TwineTest, Numbers) {
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EXPECT_EQ("123", Twine(123U).str());
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EXPECT_EQ("123", Twine(123).str());
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EXPECT_EQ("-123", Twine(-123).str());
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EXPECT_EQ("123", Twine(123).str());
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EXPECT_EQ("-123", Twine(-123).str());
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EXPECT_EQ("7b", Twine::utohexstr(123).str());
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}
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TEST(TwineTest, Characters) {
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EXPECT_EQ("x", Twine('x').str());
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EXPECT_EQ("x", Twine(static_cast<unsigned char>('x')).str());
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EXPECT_EQ("x", Twine(static_cast<signed char>('x')).str());
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}
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TEST(TwineTest, Concat) {
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// Check verse repr, since we care about the actual representation not just
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// the result.
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// Concat with null.
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EXPECT_EQ("(Twine null empty)",
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repr(Twine("hi").concat(Twine::createNull())));
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EXPECT_EQ("(Twine null empty)",
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repr(Twine::createNull().concat(Twine("hi"))));
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// Concat with empty.
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EXPECT_EQ("(Twine cstring:\"hi\" empty)",
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repr(Twine("hi").concat(Twine())));
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EXPECT_EQ("(Twine cstring:\"hi\" empty)",
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repr(Twine().concat(Twine("hi"))));
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EXPECT_EQ("(Twine smallstring:\"hi\" empty)",
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repr(Twine().concat(Twine(SmallString<5>("hi")))));
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EXPECT_EQ("(Twine formatv:\"howdy\" empty)",
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repr(Twine(formatv("howdy")).concat(Twine())));
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EXPECT_EQ("(Twine formatv:\"howdy\" empty)",
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repr(Twine().concat(Twine(formatv("howdy")))));
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EXPECT_EQ("(Twine smallstring:\"hey\" cstring:\"there\")",
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repr(Twine(SmallString<7>("hey")).concat(Twine("there"))));
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#if __cplusplus > 201402L
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EXPECT_EQ("(Twine std::string_view:\"hey\" cstring:\"there\")",
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repr(Twine(std::string_view("hey")).concat(Twine("there"))));
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#endif
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// Concatenation of unary ropes.
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EXPECT_EQ("(Twine cstring:\"a\" cstring:\"b\")",
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repr(Twine("a").concat(Twine("b"))));
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// Concatenation of other ropes.
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EXPECT_EQ("(Twine rope:(Twine cstring:\"a\" cstring:\"b\") cstring:\"c\")",
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repr(Twine("a").concat(Twine("b")).concat(Twine("c"))));
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EXPECT_EQ("(Twine cstring:\"a\" rope:(Twine cstring:\"b\" cstring:\"c\"))",
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repr(Twine("a").concat(Twine("b").concat(Twine("c")))));
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EXPECT_EQ("(Twine cstring:\"a\" rope:(Twine smallstring:\"b\" cstring:\"c\"))",
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repr(Twine("a").concat(Twine(SmallString<3>("b")).concat(Twine("c")))));
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}
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TEST(TwineTest, toNullTerminatedStringRef) {
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SmallString<8> storage;
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EXPECT_EQ(0, *Twine("hello").toNullTerminatedStringRef(storage).end());
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EXPECT_EQ(0,
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*Twine(StringRef("hello")).toNullTerminatedStringRef(storage).end());
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EXPECT_EQ(0, *Twine(SmallString<11>("hello"))
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.toNullTerminatedStringRef(storage)
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.end());
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EXPECT_EQ(0, *Twine(formatv("{0}{1}", "how", "dy"))
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.toNullTerminatedStringRef(storage)
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.end());
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}
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TEST(TwineTest, LazyEvaluation) {
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struct formatter : FormatAdapter<int> {
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explicit formatter(int &Count) : FormatAdapter(0), Count(Count) {}
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int &Count;
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void format(raw_ostream &OS, StringRef Style) override { ++Count; }
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};
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int Count = 0;
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formatter Formatter(Count);
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(void)Twine(formatv("{0}", Formatter));
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EXPECT_EQ(0, Count);
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(void)Twine(formatv("{0}", Formatter)).str();
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EXPECT_EQ(1, Count);
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}
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// I suppose linking in the entire code generator to add a unit test to check
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// the code size of the concat operation is overkill... :)
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} // end anonymous namespace
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