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Source file src/encoding/json/fold_test.go

Documentation: encoding/json

  // 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')
  }
  

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