// Copyright 2015 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.

package stringutil

import (
	"testing"

	. "github.com/pingcap/check"
	"github.com/pingcap/tidb/util/testleak"
)

func TestT(t *testing.T) {
	CustomVerboseFlag = true
	TestingT(t)
}

var _ = Suite(&testStringUtilSuite{})

type testStringUtilSuite struct {
}

func (s *testStringUtilSuite) TestReverse(c *C) {
	defer testleak.AfterTest(c)()
	table := []struct {
		str    string
		expect string
	}{
		{"zxcf", "fcxz"},
		{"abc", "cba"},
		{"Hello, 世界", "界世 ,olleH"},
		{"", ""},
	}

	for _, t := range table {
		x := Reverse(t.str)
		c.Assert(x, Equals, t.expect)
	}
}

func (s *testStringUtilSuite) TestUnquote(c *C) {
	defer testleak.AfterTest(c)()
	table := []struct {
		str    string
		expect string
		ok     bool
	}{
		{``, ``, false},
		{`'`, ``, false},
		{`'abc"`, ``, false},
		{`abcdea`, ``, false},
		{`'abc'def'`, ``, false},
		{`"abc\"`, ``, false},

		{`"abcdef"`, `abcdef`, true},
		{`"abc'def"`, `abc'def`, true},
		{`"\a汉字测试"`, `a汉字测试`, true},
		{`"☺"`, "☺", true},
		{`"\xFF"`, "xFF", true},
		{`"\U00010111"`, "U00010111", true},
		{`"\U0001011111"`, "U0001011111", true},
		{`"\a\b\f\n\r\t\v\\\""`, "a\bf\n\r\tv\\\"", true},
		{`"\Z\%\_"`, "\032\\%\\_", true},
		{`"abc\0"`, "abc\000", true},
		{`"abc\"abc"`, `abc"abc`, true},

		{`'abcdef'`, `abcdef`, true},
		{`'"'`, "\"", true},
		{`'\a\b\f\n\r\t\v\\\''`, "a\bf\n\r\tv\\'", true},
		{`' '`, " ", true},
		{"'\\a汉字'", "a汉字", true},
		{"'\\a\x90'", "a\x90", true},
		{`"\aèàø»"`, `aèàø»`, true},
	}

	for _, t := range table {
		x, err := Unquote(t.str)
		c.Assert(x, Equals, t.expect)
		comment := Commentf("source %v", t.str)
		if t.ok {
			c.Assert(err, IsNil, comment)
		} else {
			c.Assert(err, NotNil, comment)
		}
	}
}