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// Copyright 2013 The Go Authors. All rights reserved.

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

package json

import (

"bytes"

"strings"

"testing"

"unicode/utf8"

)

var foldTests = []struct {

fn func(s, t []byte) bool

s, t string

want bool

}{

{equalFoldRight, "", "", true},

{equalFoldRight, "a", "a", true},

{equalFoldRight, "", "a", false},

{equalFoldRight, "a", "", false},

{equalFoldRight, "a", "A", true},

{equalFoldRight, "AB", "ab", true},

{equalFoldRight, "AB", "ac", false},

{equalFoldRight, "sbkKc", "ſbKKc", true},

{equalFoldRight, "SbKkc", "ſbKKc", true},

{equalFoldRight, "SbKkc", "ſbKK", false},

{equalFoldRight, "e", "é", false},

{equalFoldRight, "s", "S", true},

{simpleLetterEqualFold, "", "", true},

{simpleLetterEqualFold, "abc", "abc", true},

{simpleLetterEqualFold, "abc", "ABC", true},

{simpleLetterEqualFold, "abc", "ABCD", false},

{simpleLetterEqualFold, "abc", "xxx", false},

{asciiEqualFold, "a_B", "A_b", true},

{asciiEqualFold, "aa@", "aa`", false}, // verify 0x40 and 0x60 aren't case-equivalent

}

func TestFold(t *testing.T) {

for i, tt := range foldTests {

if got := tt.fn([]byte(tt.s), []byte(tt.t)); got != tt.want {

t.Errorf("%d. %q, %q = %v; want %v", i, tt.s, tt.t, got, tt.want)

}

truth := strings.EqualFold(tt.s, tt.t)

if truth != tt.want {

t.Errorf("strings.EqualFold doesn't agree with case %d", i)

}

}

}

func TestFoldAgainstUnicode(t *testing.T) {

const bufSize = 5

buf1 := make([]byte, 0, bufSize)

buf2 := make([]byte, 0, bufSize)

var runes []rune

for i := 0x20; i <= 0x7f; i++ {

runes = append(runes, rune(i))

}

runes = append(runes, kelvin, smallLongEss)

funcs := []struct {

name string

fold func(s, t []byte) bool

letter bool // must be ASCII letter

simple bool // must be simple ASCII letter (not 'S' or 'K')

}{

{

name: "equalFoldRight",

fold: equalFoldRight,

},

{

name: "asciiEqualFold",

fold: asciiEqualFold,

simple: true,

},

{

name: "simpleLetterEqualFold",

fold: simpleLetterEqualFold,

simple: true,

letter: true,

},

}

for _, ff := range funcs {

for _, r := range runes {

if r >= utf8.RuneSelf {

continue

}

if ff.letter && !isASCIILetter(byte(r)) {

continue

}

if ff.simple && (r == 's' || r == 'S' || r == 'k' || r == 'K') {

continue

}

for _, r2 := range runes {

buf1 := append(buf1[:0], 'x')

buf2 := append(buf2[:0], 'x')

buf1 = buf1[:1+utf8.EncodeRune(buf1[1:bufSize], r)]

buf2 = buf2[:1+utf8.EncodeRune(buf2[1:bufSize], r2)]

buf1 = append(buf1, 'x')

buf2 = append(buf2, 'x')

want := bytes.EqualFold(buf1, buf2)

if got := ff.fold(buf1, buf2); got != want {

t.Errorf("%s(%q, %q) = %v; want %v", ff.name, buf1, buf2, got, want)

}

}

}

}

}

func isASCIILetter(b byte) bool {

return ('A' <= b && b <= 'Z') || ('a' <= b && b <= 'z')

}