| 🛟 Updated. 28d5985 k33g 20h ago | 1 | package buffer |
| 2 | |
| 3 | import "testing" |
| 4 | |
| 5 | func TestInsertPutsTextAtTheCursor(t *testing.T) { |
| 6 | b := NewFromString("ab") |
| 7 | b.SetCursor(Position{Line: 0, Col: 1}) |
| 8 | |
| 9 | b.Insert("X") |
| 10 | |
| 11 | if got := b.Line(0); got != "aXb" { |
| 12 | t.Errorf("Line(0) = %q, want %q", got, "aXb") |
| 13 | } |
| 14 | if got := b.Cursor(); got != (Position{Line: 0, Col: 2}) { |
| 15 | t.Errorf("Cursor() = %+v, want the position just after the inserted text", got) |
| 16 | } |
| 17 | if !b.Modified() { |
| 18 | t.Error("inserting must mark the buffer modified") |
| 19 | } |
| 20 | } |
| 21 | |
| 22 | func TestInsertSplitsTheLineOnALineFeed(t *testing.T) { |
| 23 | b := NewFromString("ab") |
| 24 | b.SetCursor(Position{Line: 0, Col: 1}) |
| 25 | |
| 26 | b.Insert("1\n2") |
| 27 | |
| 28 | want := []string{"a1", "2b"} |
| 29 | if got := b.LineCount(); got != len(want) { |
| 30 | t.Fatalf("LineCount() = %d, want %d", got, len(want)) |
| 31 | } |
| 32 | for i, w := range want { |
| 33 | if got := b.Line(i); got != w { |
| 34 | t.Errorf("Line(%d) = %q, want %q", i, got, w) |
| 35 | } |
| 36 | } |
| 37 | if got := b.Cursor(); got != (Position{Line: 1, Col: 1}) { |
| 38 | t.Errorf("Cursor() = %+v, want {Line:1 Col:1}", got) |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | func TestInsertReplacesTheSelection(t *testing.T) { |
| 43 | b := NewFromString("hello world") |
| 44 | b.SetCursor(Position{Line: 0, Col: 0}) |
| 45 | b.StartSelection() |
| 46 | b.SetCursorKeepingSelection(Position{Line: 0, Col: 5}) |
| 47 | |
| 48 | b.Insert("bye") |
| 49 | |
| 50 | if got := b.Line(0); got != "bye world" { |
| 51 | t.Errorf("Line(0) = %q, want %q", got, "bye world") |
| 52 | } |
| 53 | if _, ok := b.Selection(); ok { |
| 54 | t.Error("the selection must be gone after typing over it") |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | func TestInsertNewlineAndIndentCarriesTheLeadingWhitespace(t *testing.T) { |
| 59 | tests := []struct { |
| 60 | name string |
| 61 | line string |
| 62 | col int |
| 63 | wantNext string |
| 64 | }{ |
| 65 | {"tab indent", "\tfoo()", 6, "\t"}, |
| 66 | {"space indent", " foo()", 9, " "}, |
| 67 | {"no indent", "foo()", 5, ""}, |
| 68 | {"cursor inside the indent", "\t\tfoo()", 1, "\t"}, |
| 69 | } |
| 70 | |
| 71 | for _, tc := range tests { |
| 72 | t.Run(tc.name, func(t *testing.T) { |
| 73 | b := NewFromString(tc.line) |
| 74 | b.SetCursor(Position{Line: 0, Col: tc.col}) |
| 75 | |
| 76 | b.InsertNewlineAndIndent() |
| 77 | |
| 78 | if got := b.LineCount(); got != 2 { |
| 79 | t.Fatalf("LineCount() = %d, want 2", got) |
| 80 | } |
| 81 | if got := b.Line(1); got[:len(tc.wantNext)] != tc.wantNext { |
| 82 | t.Errorf("Line(1) = %q, want it to start with %q", got, tc.wantNext) |
| 83 | } |
| 84 | if got := b.Cursor().Col; got != len(tc.wantNext) { |
| 85 | t.Errorf("Cursor().Col = %d, want %d (just past the indent)", got, len(tc.wantNext)) |
| 86 | } |
| 87 | }) |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | func TestBackspaceRemovesTheCharacterBefore(t *testing.T) { |
| 92 | b := NewFromString("abc") |
| 93 | b.SetCursor(Position{Line: 0, Col: 2}) |
| 94 | |
| 95 | b.Backspace() |
| 96 | |
| 97 | if got := b.Line(0); got != "ac" { |
| 98 | t.Errorf("Line(0) = %q, want %q", got, "ac") |
| 99 | } |
| 100 | if got := b.Cursor(); got != (Position{Line: 0, Col: 1}) { |
| 101 | t.Errorf("Cursor() = %+v, want {Line:0 Col:1}", got) |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | func TestBackspaceAtColumnZeroJoinsTheLines(t *testing.T) { |
| 106 | b := NewFromString("ab\ncd") |
| 107 | b.SetCursor(Position{Line: 1, Col: 0}) |
| 108 | |
| 109 | b.Backspace() |
| 110 | |
| 111 | if got := b.LineCount(); got != 1 { |
| 112 | t.Fatalf("LineCount() = %d, want 1", got) |
| 113 | } |
| 114 | if got := b.Line(0); got != "abcd" { |
| 115 | t.Errorf("Line(0) = %q, want %q", got, "abcd") |
| 116 | } |
| 117 | if got := b.Cursor(); got != (Position{Line: 0, Col: 2}) { |
| 118 | t.Errorf("Cursor() = %+v, want the join point", got) |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | func TestBackspaceAtTheStartOfTheBufferDoesNothing(t *testing.T) { |
| 123 | b := NewFromString("abc") |
| 124 | b.SetCursor(Position{}) |
| 125 | |
| 126 | b.Backspace() |
| 127 | |
| 128 | if got := b.Text(); got != "abc" { |
| 129 | t.Errorf("Text() = %q, want it unchanged", got) |
| 130 | } |
| 131 | if b.Modified() { |
| 132 | t.Error("a backspace that changed nothing must not mark the buffer modified") |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | func TestDeleteRemovesTheCharacterUnderTheCursor(t *testing.T) { |
| 137 | b := NewFromString("abc") |
| 138 | b.SetCursor(Position{Line: 0, Col: 1}) |
| 139 | |
| 140 | b.Delete() |
| 141 | |
| 142 | if got := b.Line(0); got != "ac" { |
| 143 | t.Errorf("Line(0) = %q, want %q", got, "ac") |
| 144 | } |
| 145 | if got := b.Cursor(); got != (Position{Line: 0, Col: 1}) { |
| 146 | t.Errorf("Cursor() = %+v, want it to stay put", got) |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | func TestDeleteAtTheEndOfALineJoinsTheNextOne(t *testing.T) { |
| 151 | b := NewFromString("ab\ncd") |
| 152 | b.SetCursor(Position{Line: 0, Col: 2}) |
| 153 | |
| 154 | b.Delete() |
| 155 | |
| 156 | if got := b.Text(); got != "abcd" { |
| 157 | t.Errorf("Text() = %q, want %q", got, "abcd") |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | func TestDeleteAtTheEndOfTheBufferDoesNothing(t *testing.T) { |
| 162 | b := NewFromString("ab") |
| 163 | b.MoveBufferEnd() |
| 164 | |
| 165 | b.Delete() |
| 166 | |
| 167 | if got := b.Text(); got != "ab" { |
| 168 | t.Errorf("Text() = %q, want it unchanged", got) |
| 169 | } |
| 170 | if b.Modified() { |
| 171 | t.Error("a delete that changed nothing must not mark the buffer modified") |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | func TestDeleteRangeAcrossSeveralLines(t *testing.T) { |
| 176 | b := NewFromString("one\ntwo\nthree") |
| 177 | |
| 178 | b.DeleteRange(Range{ |
| 179 | Start: Position{Line: 0, Col: 1}, |
| 180 | End: Position{Line: 2, Col: 2}, |
| 181 | }) |
| 182 | |
| 183 | if got := b.LineCount(); got != 1 { |
| 184 | t.Fatalf("LineCount() = %d, want 1", got) |
| 185 | } |
| 186 | if got := b.Line(0); got != "oree" { |
| 187 | t.Errorf("Line(0) = %q, want %q", got, "oree") |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | func TestReplaceRangeClampsOutOfBoundsPositions(t *testing.T) { |
| 192 | b := NewFromString("abc") |
| 193 | |
| 194 | end := b.ReplaceRange(Range{ |
| 195 | Start: Position{Line: -5, Col: -5}, |
| 196 | End: Position{Line: 99, Col: 99}, |
| 197 | }, "z") |
| 198 | |
| 199 | if got := b.Text(); got != "z" { |
| 200 | t.Errorf("Text() = %q, want %q", got, "z") |
| 201 | } |
| 202 | if end != (Position{Line: 0, Col: 1}) { |
| 203 | t.Errorf("ReplaceRange returned %+v, want {Line:0 Col:1}", end) |
| 204 | } |
| 205 | } |
| 206 | |
| 207 | func TestReplaceRangeAcceptsReversedBounds(t *testing.T) { |
| 208 | b := NewFromString("abcd") |
| 209 | |
| 210 | b.ReplaceRange(Range{ |
| 211 | Start: Position{Line: 0, Col: 3}, |
| 212 | End: Position{Line: 0, Col: 1}, |
| 213 | }, "-") |
| 214 | |
| 215 | if got := b.Line(0); got != "a-d" { |
| 216 | t.Errorf("Line(0) = %q, want %q", got, "a-d") |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | func TestReplaceRangeDoesNotAliasTheInsertedText(t *testing.T) { |
| 221 | b := NewFromString("x") |
| 222 | |
| 223 | // Two successive edits must not share memory through the internal line |
| 224 | // slices, or the second would corrupt the first. |
| 225 | b.ReplaceRange(Range{}, "one\ntwo\nthree") |
| 226 | b.ReplaceRange(Range{Start: Position{Line: 1}, End: Position{Line: 1, Col: 3}}, "TWO") |
| 227 | |
| 228 | want := "one\nTWO\nthreex" |
| 229 | if got := b.Text(); got != want { |
| 230 | t.Errorf("Text() = %q, want %q", got, want) |
| 231 | } |
| 232 | } |