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// Copyright 2017 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// This file contains functions that remove a defined part from the string,
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// i.e., strip the string.
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#include "absl/strings/strip.h"
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#include <cassert>
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#include <cstdio>
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#include <cstring>
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#include "gmock/gmock.h"
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#include "gtest/gtest.h"
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#include "absl/strings/string_view.h"
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namespace {
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using testing::ElementsAre;
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using testing::IsEmpty;
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TEST(Strip, ConsumePrefixOneChar) {
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absl::string_view input("abc");
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EXPECT_TRUE(absl::ConsumePrefix(&input, "a"));
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EXPECT_EQ(input, "bc");
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EXPECT_FALSE(absl::ConsumePrefix(&input, "x"));
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EXPECT_EQ(input, "bc");
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EXPECT_TRUE(absl::ConsumePrefix(&input, "b"));
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EXPECT_EQ(input, "c");
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EXPECT_TRUE(absl::ConsumePrefix(&input, "c"));
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EXPECT_EQ(input, "");
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EXPECT_FALSE(absl::ConsumePrefix(&input, "a"));
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EXPECT_EQ(input, "");
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}
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TEST(Strip, ConsumePrefix) {
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absl::string_view input("abcdef");
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EXPECT_FALSE(absl::ConsumePrefix(&input, "abcdefg"));
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EXPECT_EQ(input, "abcdef");
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EXPECT_FALSE(absl::ConsumePrefix(&input, "abce"));
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EXPECT_EQ(input, "abcdef");
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EXPECT_TRUE(absl::ConsumePrefix(&input, ""));
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EXPECT_EQ(input, "abcdef");
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EXPECT_FALSE(absl::ConsumePrefix(&input, "abcdeg"));
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EXPECT_EQ(input, "abcdef");
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EXPECT_TRUE(absl::ConsumePrefix(&input, "abcdef"));
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EXPECT_EQ(input, "");
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input = "abcdef";
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EXPECT_TRUE(absl::ConsumePrefix(&input, "abcde"));
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EXPECT_EQ(input, "f");
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}
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TEST(Strip, ConsumeSuffix) {
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absl::string_view input("abcdef");
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EXPECT_FALSE(absl::ConsumeSuffix(&input, "abcdefg"));
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EXPECT_EQ(input, "abcdef");
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EXPECT_TRUE(absl::ConsumeSuffix(&input, ""));
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EXPECT_EQ(input, "abcdef");
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EXPECT_TRUE(absl::ConsumeSuffix(&input, "def"));
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EXPECT_EQ(input, "abc");
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input = "abcdef";
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EXPECT_FALSE(absl::ConsumeSuffix(&input, "abcdeg"));
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EXPECT_EQ(input, "abcdef");
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EXPECT_TRUE(absl::ConsumeSuffix(&input, "f"));
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EXPECT_EQ(input, "abcde");
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EXPECT_TRUE(absl::ConsumeSuffix(&input, "abcde"));
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EXPECT_EQ(input, "");
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}
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TEST(Strip, StripPrefix) {
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const absl::string_view null_str;
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EXPECT_EQ(absl::StripPrefix("foobar", "foo"), "bar");
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EXPECT_EQ(absl::StripPrefix("foobar", ""), "foobar");
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EXPECT_EQ(absl::StripPrefix("foobar", null_str), "foobar");
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EXPECT_EQ(absl::StripPrefix("foobar", "foobar"), "");
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EXPECT_EQ(absl::StripPrefix("foobar", "bar"), "foobar");
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EXPECT_EQ(absl::StripPrefix("foobar", "foobarr"), "foobar");
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EXPECT_EQ(absl::StripPrefix("", ""), "");
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}
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TEST(Strip, StripSuffix) {
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const absl::string_view null_str;
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EXPECT_EQ(absl::StripSuffix("foobar", "bar"), "foo");
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EXPECT_EQ(absl::StripSuffix("foobar", ""), "foobar");
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EXPECT_EQ(absl::StripSuffix("foobar", null_str), "foobar");
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EXPECT_EQ(absl::StripSuffix("foobar", "foobar"), "");
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EXPECT_EQ(absl::StripSuffix("foobar", "foo"), "foobar");
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EXPECT_EQ(absl::StripSuffix("foobar", "ffoobar"), "foobar");
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EXPECT_EQ(absl::StripSuffix("", ""), "");
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}
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TEST(Strip, RemoveExtraAsciiWhitespace) {
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const char* inputs[] = {
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"No extra space",
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" Leading whitespace",
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"Trailing whitespace ",
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" Leading and trailing ",
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" Whitespace \t in\v middle ",
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"'Eeeeep! \n Newlines!\n",
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"nospaces",
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};
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const char* outputs[] = {
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"No extra space",
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"Leading whitespace",
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"Trailing whitespace",
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"Leading and trailing",
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"Whitespace in middle",
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"'Eeeeep! Newlines!",
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"nospaces",
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};
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int NUM_TESTS = 7;
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for (int i = 0; i < NUM_TESTS; i++) {
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std::string s(inputs[i]);
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absl::RemoveExtraAsciiWhitespace(&s);
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EXPECT_STREQ(outputs[i], s.c_str());
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}
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// Test that absl::RemoveExtraAsciiWhitespace returns immediately for empty
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// strings (It was adding the \0 character to the C++ std::string, which broke
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// tests involving empty())
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std::string zero_string = "";
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assert(zero_string.empty());
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absl::RemoveExtraAsciiWhitespace(&zero_string);
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EXPECT_EQ(zero_string.size(), 0);
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EXPECT_TRUE(zero_string.empty());
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}
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TEST(Strip, StripTrailingAsciiWhitespace) {
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std::string test = "foo ";
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absl::StripTrailingAsciiWhitespace(&test);
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EXPECT_EQ(test, "foo");
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test = " ";
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absl::StripTrailingAsciiWhitespace(&test);
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EXPECT_EQ(test, "");
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test = "";
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absl::StripTrailingAsciiWhitespace(&test);
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EXPECT_EQ(test, "");
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test = " abc\t";
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absl::StripTrailingAsciiWhitespace(&test);
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EXPECT_EQ(test, " abc");
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}
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TEST(String, StripLeadingAsciiWhitespace) {
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absl::string_view orig = "\t \n\f\r\n\vfoo";
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EXPECT_EQ("foo", absl::StripLeadingAsciiWhitespace(orig));
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orig = "\t \n\f\r\v\n\t \n\f\r\v\n";
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EXPECT_EQ(absl::string_view(), absl::StripLeadingAsciiWhitespace(orig));
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}
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TEST(Strip, StripAsciiWhitespace) {
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std::string test2 = "\t \f\r\n\vfoo \t\f\r\v\n";
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absl::StripAsciiWhitespace(&test2);
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EXPECT_EQ(test2, "foo");
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std::string test3 = "bar";
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absl::StripAsciiWhitespace(&test3);
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EXPECT_EQ(test3, "bar");
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std::string test4 = "\t \f\r\n\vfoo";
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absl::StripAsciiWhitespace(&test4);
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EXPECT_EQ(test4, "foo");
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std::string test5 = "foo \t\f\r\v\n";
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absl::StripAsciiWhitespace(&test5);
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EXPECT_EQ(test5, "foo");
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absl::string_view test6("\t \f\r\n\vfoo \t\f\r\v\n");
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test6 = absl::StripAsciiWhitespace(test6);
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EXPECT_EQ(test6, "foo");
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test6 = absl::StripAsciiWhitespace(test6);
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EXPECT_EQ(test6, "foo"); // already stripped
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}
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} // namespace
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