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// Copyright 2021 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package util
import (
"fmt"
"strconv"
"strings"
"testing"
"github.com/stretchr/testify/assert"
)
func TestEllipsisGuessDisplayWidth(t *testing.T) {
cases := []struct {
r string
want int
}{
{r: "a", want: 1},
{r: "é", want: 1},
{r: "测", want: 2},
{r: "⚽", want: 2},
{r: "☁️", want: 3}, // 2 runes, it has a mark
{r: "\u200B", want: 1}, // ZWSP
{r: "\u3000", want: 2}, // ideographic space
}
for _, c := range cases {
t.Run(c.r, func(t *testing.T) {
w := 0
for _, r := range c.r {
w += ellipsisGuessDisplayWidth(r)
}
assert.Equal(t, c.want, w, "hex=% x", []byte(c.r))
})
}
}
func TestEllipsisString(t *testing.T) {
cases := []struct {
limit int
input, left, right string
}{
{limit: 0, input: "abcde", left: "", right: "…abcde"},
{limit: 1, input: "abcde", left: "", right: "…abcde"},
{limit: 2, input: "abcde", left: "", right: "…abcde"},
{limit: 3, input: "abcde", left: "…", right: "…abcde"},
{limit: 4, input: "abcde", left: "a…", right: "…bcde"},
{limit: 5, input: "abcde", left: "abcde", right: ""},
{limit: 6, input: "abcde", left: "abcde", right: ""},
{limit: 7, input: "abcde", left: "abcde", right: ""},
// a CJK char or emoji is considered as 2-ASCII width, the ellipsis is 3-ASCII width
{limit: 0, input: "测试文本", left: "", right: "…测试文本"},
{limit: 1, input: "测试文本", left: "", right: "…测试文本"},
{limit: 2, input: "测试文本", left: "", right: "…测试文本"},
{limit: 3, input: "测试文本", left: "…", right: "…测试文本"},
{limit: 4, input: "测试文本", left: "…", right: "…测试文本"},
{limit: 5, input: "测试文本", left: "测…", right: "…试文本"},
{limit: 6, input: "测试文本", left: "测…", right: "…试文本"},
{limit: 7, input: "测试文本", left: "测试…", right: "…文本"},
{limit: 8, input: "测试文本", left: "测试文本", right: ""},
{limit: 9, input: "测试文本", left: "测试文本", right: ""},
{limit: 6, input: "测试abc", left: "测…", right: "…试abc"},
{limit: 7, input: "测试abc", left: "测试abc", right: ""}, // exactly 7-width
{limit: 8, input: "测试abc", left: "测试abc", right: ""},
{limit: 7, input: "测abc试啊", left: "测ab…", right: "…c试啊"},
{limit: 8, input: "测abc试啊", left: "测abc…", right: "…试啊"},
{limit: 9, input: "测abc试啊", left: "测abc试啊", right: ""}, // exactly 9-width
{limit: 10, input: "测abc试啊", left: "测abc试啊", right: ""},
}
for _, c := range cases {
t.Run(fmt.Sprintf("%s(%d)", c.input, c.limit), func(t *testing.T) {
left, right := EllipsisDisplayStringX(c.input, c.limit)
assert.Equal(t, c.left, left, "left")
assert.Equal(t, c.right, right, "right")
})
}
t.Run("LongInput", func(t *testing.T) {
left, right := EllipsisDisplayStringX(strings.Repeat("abc", 240), 90)
assert.Equal(t, strings.Repeat("abc", 29)+"…", left)
assert.Equal(t, "…"+strings.Repeat("abc", 211), right)
})
t.Run("InvalidUtf8", func(t *testing.T) {
invalidCases := []struct {
limit int
left, right string
}{
{limit: 0, left: "", right: "...\xef\x03\xfe\xef\x03\xfe"},
{limit: 1, left: "", right: "...\xef\x03\xfe\xef\x03\xfe"},
{limit: 2, left: "", right: "...\xef\x03\xfe\xef\x03\xfe"},
{limit: 3, left: "...", right: "...\xef\x03\xfe\xef\x03\xfe"},
{limit: 4, left: "...", right: "...\xef\x03\xfe\xef\x03\xfe"},
{limit: 5, left: "\xef\x03\xfe...", right: "...\xef\x03\xfe"},
{limit: 6, left: "\xef\x03\xfe\xef\x03\xfe", right: ""},
{limit: 7, left: "\xef\x03\xfe\xef\x03\xfe", right: ""},
}
for _, c := range invalidCases {
t.Run(strconv.Itoa(c.limit), func(t *testing.T) {
left, right := EllipsisDisplayStringX("\xef\x03\xfe\xef\x03\xfe", c.limit)
assert.Equal(t, c.left, left, "left")
assert.Equal(t, c.right, right, "right")
})
}
})
t.Run("IsLikelyEllipsisLeftPart", func(t *testing.T) {
assert.True(t, IsLikelyEllipsisLeftPart("abcde…"))
assert.True(t, IsLikelyEllipsisLeftPart("abcde..."))
})
}
func TestTruncateRunes(t *testing.T) {
assert.Empty(t, TruncateRunes("", 0))
assert.Empty(t, TruncateRunes("", 1))
assert.Empty(t, TruncateRunes("ab", 0))
assert.Equal(t, "a", TruncateRunes("ab", 1))
assert.Equal(t, "ab", TruncateRunes("ab", 2))
assert.Equal(t, "ab", TruncateRunes("ab", 3))
assert.Empty(t, TruncateRunes("测试", 0))
assert.Equal(t, "测", TruncateRunes("测试", 1))
assert.Equal(t, "测试", TruncateRunes("测试", 2))
assert.Equal(t, "测试", TruncateRunes("测试", 3))
}
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