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// Copyright 2017 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// This file contains functions that remove a defined part from the std::string,
// i.e., strip the std::string.
#include "absl/strings/strip.h"
#include <cassert>
#include <cstdio>
#include <cstring>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/strings/string_view.h"
namespace {
using testing::ElementsAre;
using testing::IsEmpty;
TEST(Strip, ConsumePrefixOneChar) {
absl::string_view input("abc");
EXPECT_TRUE(absl::ConsumePrefix(&input, "a"));
EXPECT_EQ(input, "bc");
EXPECT_FALSE(absl::ConsumePrefix(&input, "x"));
EXPECT_EQ(input, "bc");
EXPECT_TRUE(absl::ConsumePrefix(&input, "b"));
EXPECT_EQ(input, "c");
EXPECT_TRUE(absl::ConsumePrefix(&input, "c"));
EXPECT_EQ(input, "");
EXPECT_FALSE(absl::ConsumePrefix(&input, "a"));
EXPECT_EQ(input, "");
}
TEST(Strip, ConsumePrefix) {
absl::string_view input("abcdef");
EXPECT_FALSE(absl::ConsumePrefix(&input, "abcdefg"));
EXPECT_EQ(input, "abcdef");
EXPECT_FALSE(absl::ConsumePrefix(&input, "abce"));
EXPECT_EQ(input, "abcdef");
EXPECT_TRUE(absl::ConsumePrefix(&input, ""));
EXPECT_EQ(input, "abcdef");
EXPECT_FALSE(absl::ConsumePrefix(&input, "abcdeg"));
EXPECT_EQ(input, "abcdef");
EXPECT_TRUE(absl::ConsumePrefix(&input, "abcdef"));
EXPECT_EQ(input, "");
input = "abcdef";
EXPECT_TRUE(absl::ConsumePrefix(&input, "abcde"));
EXPECT_EQ(input, "f");
}
TEST(Strip, ConsumeSuffix) {
absl::string_view input("abcdef");
EXPECT_FALSE(absl::ConsumeSuffix(&input, "abcdefg"));
EXPECT_EQ(input, "abcdef");
EXPECT_TRUE(absl::ConsumeSuffix(&input, ""));
EXPECT_EQ(input, "abcdef");
EXPECT_TRUE(absl::ConsumeSuffix(&input, "def"));
EXPECT_EQ(input, "abc");
input = "abcdef";
EXPECT_FALSE(absl::ConsumeSuffix(&input, "abcdeg"));
EXPECT_EQ(input, "abcdef");
EXPECT_TRUE(absl::ConsumeSuffix(&input, "f"));
EXPECT_EQ(input, "abcde");
EXPECT_TRUE(absl::ConsumeSuffix(&input, "abcde"));
EXPECT_EQ(input, "");
}
TEST(Strip, StripPrefix) {
const absl::string_view null_str;
EXPECT_EQ(absl::StripPrefix("foobar", "foo"), "bar");
EXPECT_EQ(absl::StripPrefix("foobar", ""), "foobar");
EXPECT_EQ(absl::StripPrefix("foobar", null_str), "foobar");
EXPECT_EQ(absl::StripPrefix("foobar", "foobar"), "");
EXPECT_EQ(absl::StripPrefix("foobar", "bar"), "foobar");
EXPECT_EQ(absl::StripPrefix("foobar", "foobarr"), "foobar");
EXPECT_EQ(absl::StripPrefix("", ""), "");
}
TEST(Strip, StripSuffix) {
const absl::string_view null_str;
EXPECT_EQ(absl::StripSuffix("foobar", "bar"), "foo");
EXPECT_EQ(absl::StripSuffix("foobar", ""), "foobar");
EXPECT_EQ(absl::StripSuffix("foobar", null_str), "foobar");
EXPECT_EQ(absl::StripSuffix("foobar", "foobar"), "");
EXPECT_EQ(absl::StripSuffix("foobar", "foo"), "foobar");
EXPECT_EQ(absl::StripSuffix("foobar", "ffoobar"), "foobar");
EXPECT_EQ(absl::StripSuffix("", ""), "");
}
TEST(Strip, RemoveExtraAsciiWhitespace) {
const char* inputs[] = {
"No extra space",
" Leading whitespace",
"Trailing whitespace ",
" Leading and trailing ",
" Whitespace \t in\v middle ",
"'Eeeeep! \n Newlines!\n",
"nospaces",
};
const char* outputs[] = {
"No extra space",
"Leading whitespace",
"Trailing whitespace",
"Leading and trailing",
"Whitespace in middle",
"'Eeeeep! Newlines!",
"nospaces",
};
int NUM_TESTS = 7;
for (int i = 0; i < NUM_TESTS; i++) {
std::string s(inputs[i]);
absl::RemoveExtraAsciiWhitespace(&s);
EXPECT_STREQ(outputs[i], s.c_str());
}
// Test that absl::RemoveExtraAsciiWhitespace returns immediately for empty
// strings (It was adding the \0 character to the C++ std::string, which broke
// tests involving empty())
std::string zero_string = "";
assert(zero_string.empty());
absl::RemoveExtraAsciiWhitespace(&zero_string);
EXPECT_EQ(zero_string.size(), 0);
EXPECT_TRUE(zero_string.empty());
}
TEST(Strip, StripTrailingAsciiWhitespace) {
std::string test = "foo ";
absl::StripTrailingAsciiWhitespace(&test);
EXPECT_EQ(test, "foo");
test = " ";
absl::StripTrailingAsciiWhitespace(&test);
EXPECT_EQ(test, "");
test = "";
absl::StripTrailingAsciiWhitespace(&test);
EXPECT_EQ(test, "");
test = " abc\t";
absl::StripTrailingAsciiWhitespace(&test);
EXPECT_EQ(test, " abc");
}
TEST(String, StripLeadingAsciiWhitespace) {
absl::string_view orig = "\t \n\f\r\n\vfoo";
EXPECT_EQ("foo", absl::StripLeadingAsciiWhitespace(orig));
orig = "\t \n\f\r\v\n\t \n\f\r\v\n";
EXPECT_EQ(absl::string_view(), absl::StripLeadingAsciiWhitespace(orig));
}
} // namespace
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