tables_test.go

Documentation: golang.org/x/text/width

     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  
     5  package width
     6  
     7  import (
     8  	"testing"
     9  
    10  	"golang.org/x/text/internal/testtext"
    11  )
    12  
    13  const (
    14  	loSurrogate = 0xD800
    15  	hiSurrogate = 0xDFFF
    16  )
    17  
    18  func 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.
    50  func 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
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