1// Copyright 2015 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package width
6
7import (
8	"testing"
9
10	"golang.org/x/text/internal/testtext"
11)
12
13const (
14	loSurrogate = 0xD800
15	hiSurrogate = 0xDFFF
16)
17
18func TestTables(t *testing.T) {
19	testtext.SkipIfNotLong(t)
20
21	runes := map[rune]Kind{}
22	getWidthData(func(r rune, tag elem, _ rune) {
23		runes[r] = tag.kind()
24	})
25	for r := rune(0); r < 0x10FFFF; r++ {
26		if loSurrogate <= r && r <= hiSurrogate {
27			continue
28		}
29		p := LookupRune(r)
30		if got, want := p.Kind(), runes[r]; got != want {
31			t.Errorf("Kind of %U was %s; want %s.", r, got, want)
32		}
33		want, mapped := foldRune(r)
34		if got := p.Folded(); (got == 0) == mapped || got != 0 && got != want {
35			t.Errorf("Folded(%U) = %U; want %U", r, got, want)
36		}
37		want, mapped = widenRune(r)
38		if got := p.Wide(); (got == 0) == mapped || got != 0 && got != want {
39			t.Errorf("Wide(%U) = %U; want %U", r, got, want)
40		}
41		want, mapped = narrowRune(r)
42		if got := p.Narrow(); (got == 0) == mapped || got != 0 && got != want {
43			t.Errorf("Narrow(%U) = %U; want %U", r, got, want)
44		}
45	}
46}
47
48// TestAmbiguous verifies that ambiguous runes with a mapping always map to
49// a halfwidth rune.
50func TestAmbiguous(t *testing.T) {
51	for r, m := range mapRunes {
52		if m.e != tagAmbiguous {
53			continue
54		}
55		if k := mapRunes[m.r].e.kind(); k != EastAsianHalfwidth {
56			t.Errorf("Rune %U is ambiguous and maps to a rune of type %v", r, k)
57		}
58	}
59}
60