70 lines
1.7 KiB
Go
70 lines
1.7 KiB
Go
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package span_test
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import (
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"testing"
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"golang.org/x/tools/internal/span"
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)
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// TestUTF16 tests the conversion of column information between the native
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// byte offset and the utf16 form.
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func TestUTF16(t *testing.T) {
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var input = []byte(`
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𐐀23456789
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1𐐀3456789
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12𐐀456789
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123𐐀56789
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1234𐐀6789
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12345𐐀789
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123456𐐀89
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1234567𐐀9
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12345678𐐀
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`[1:])
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c := span.NewContentConverter("test", input)
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for line := 1; line <= 9; line++ {
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runeColumn, runeChr := 0, 0
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for chr := 1; chr <= 9; chr++ {
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switch {
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case chr <= line:
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runeChr = chr
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runeColumn = chr
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case chr == line+1:
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runeChr = chr - 1
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runeColumn = chr - 1
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default:
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runeChr = chr
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runeColumn = chr + 2
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}
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p := span.NewPoint(line, runeColumn, (line-1)*13+(runeColumn-1))
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// check conversion to utf16 format
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gotChr, err := span.ToUTF16Column(p, input)
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if err != nil {
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t.Error(err)
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}
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if runeChr != gotChr {
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t.Errorf("ToUTF16Column(%v): expected %v, got %v", p, runeChr, gotChr)
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}
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offset, err := c.ToOffset(p.Line(), p.Column())
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if err != nil {
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t.Error(err)
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}
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if p.Offset() != offset {
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t.Errorf("ToOffset(%v,%v): expected %v, got %v", p.Line(), p.Column(), p.Offset(), offset)
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}
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// and check the conversion back
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lineStart := span.NewPoint(p.Line(), 1, p.Offset()-(p.Column()-1))
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gotPoint, err := span.FromUTF16Column(lineStart, chr, input)
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if err != nil {
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t.Error(err)
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}
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if p != gotPoint {
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t.Errorf("FromUTF16Column(%v,%v): expected %v, got %v", p.Line(), chr, p, gotPoint)
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}
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}
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}
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}
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