| 🛟 Updated. 28d5985 k33g 21h ago | 1 | package buffer |
| 2 | |
| 3 | import "testing" |
| 4 | |
| 5 | func TestSetCursorClampsIntoTheBuffer(t *testing.T) { |
| 6 | b := NewFromString("ab\ncdef") |
| 7 | |
| 8 | tests := []struct { |
| 9 | name string |
| 10 | give Position |
| 11 | want Position |
| 12 | }{ |
| 13 | {"past the end of a line", Position{Line: 0, Col: 99}, Position{Line: 0, Col: 2}}, |
| 14 | {"past the last line", Position{Line: 99, Col: 0}, Position{Line: 1, Col: 4}}, |
| 15 | {"negative line", Position{Line: -1, Col: 3}, Position{Line: 0, Col: 0}}, |
| 16 | {"negative column", Position{Line: 1, Col: -3}, Position{Line: 1, Col: 0}}, |
| 17 | {"already valid", Position{Line: 1, Col: 2}, Position{Line: 1, Col: 2}}, |
| 18 | } |
| 19 | |
| 20 | for _, tc := range tests { |
| 21 | t.Run(tc.name, func(t *testing.T) { |
| 22 | b.SetCursor(tc.give) |
| 23 | if got := b.Cursor(); got != tc.want { |
| 24 | t.Errorf("SetCursor(%+v) left the cursor at %+v, want %+v", tc.give, got, tc.want) |
| 25 | } |
| 26 | }) |
| 27 | } |
| 28 | } |
| 29 | |
| 30 | func TestMoveLeftWrapsOntoThePreviousLine(t *testing.T) { |
| 31 | b := NewFromString("ab\ncd") |
| 32 | b.SetCursor(Position{Line: 1, Col: 0}) |
| 33 | |
| 34 | b.MoveLeft() |
| 35 | |
| 36 | if got := b.Cursor(); got != (Position{Line: 0, Col: 2}) { |
| 37 | t.Errorf("Cursor() = %+v, want the end of line 0", got) |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | func TestMoveLeftStopsAtTheStartOfTheBuffer(t *testing.T) { |
| 42 | b := NewFromString("ab") |
| 43 | b.SetCursor(Position{}) |
| 44 | |
| 45 | b.MoveLeft() |
| 46 | |
| 47 | if got := b.Cursor(); got != (Position{}) { |
| 48 | t.Errorf("Cursor() = %+v, want it to stay at the origin", got) |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | func TestMoveRightWrapsOntoTheNextLine(t *testing.T) { |
| 53 | b := NewFromString("ab\ncd") |
| 54 | b.SetCursor(Position{Line: 0, Col: 2}) |
| 55 | |
| 56 | b.MoveRight() |
| 57 | |
| 58 | if got := b.Cursor(); got != (Position{Line: 1, Col: 0}) { |
| 59 | t.Errorf("Cursor() = %+v, want the start of line 1", got) |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | func TestMoveRightStopsAtTheEndOfTheBuffer(t *testing.T) { |
| 64 | b := NewFromString("ab") |
| 65 | b.MoveBufferEnd() |
| 66 | |
| 67 | b.MoveRight() |
| 68 | |
| 69 | if got := b.Cursor(); got != (Position{Line: 0, Col: 2}) { |
| 70 | t.Errorf("Cursor() = %+v, want it to stay at the end", got) |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | func TestMoveUpAndDownClampTheColumn(t *testing.T) { |
| 75 | b := NewFromString("longer line\nab") |
| 76 | b.SetCursor(Position{Line: 0, Col: 9}) |
| 77 | |
| 78 | b.MoveDown() |
| 79 | if got := b.Cursor(); got != (Position{Line: 1, Col: 2}) { |
| 80 | t.Errorf("after MoveDown, Cursor() = %+v, want the column clamped to 2", got) |
| 81 | } |
| 82 | |
| 83 | b.MoveUp() |
| 84 | if got := b.Cursor(); got != (Position{Line: 0, Col: 2}) { |
| 85 | t.Errorf("after MoveUp, Cursor() = %+v, want the clamped column kept", got) |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | func TestMoveToLineAndBufferBounds(t *testing.T) { |
| 90 | b := NewFromString("abc\ndefgh") |
| 91 | b.SetCursor(Position{Line: 1, Col: 2}) |
| 92 | |
| 93 | b.MoveLineStart() |
| 94 | if got := b.Cursor(); got != (Position{Line: 1, Col: 0}) { |
| 95 | t.Errorf("MoveLineStart left the cursor at %+v", got) |
| 96 | } |
| 97 | |
| 98 | b.MoveLineEnd() |
| 99 | if got := b.Cursor(); got != (Position{Line: 1, Col: 5}) { |
| 100 | t.Errorf("MoveLineEnd left the cursor at %+v", got) |
| 101 | } |
| 102 | |
| 103 | b.MoveBufferStart() |
| 104 | if got := b.Cursor(); got != (Position{}) { |
| 105 | t.Errorf("MoveBufferStart left the cursor at %+v", got) |
| 106 | } |
| 107 | |
| 108 | b.MoveBufferEnd() |
| 109 | if got := b.Cursor(); got != (Position{Line: 1, Col: 5}) { |
| 110 | t.Errorf("MoveBufferEnd left the cursor at %+v", got) |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | func TestMoveWordLeft(t *testing.T) { |
| 115 | tests := []struct { |
| 116 | name string |
| 117 | text string |
| 118 | from int |
| 119 | wantCol int |
| 120 | }{ |
| 121 | {"from the end of a word", "foo bar", 7, 4}, |
| 122 | {"from the start of a word", "foo bar", 4, 0}, |
| 123 | {"over several separators", "foo bar", 9, 6}, |
| 124 | {"from just after separators", "foo bar", 6, 0}, |
| 125 | {"punctuation is a separator", "a.b", 3, 2}, |
| 126 | } |
| 127 | |
| 128 | for _, tc := range tests { |
| 129 | t.Run(tc.name, func(t *testing.T) { |
| 130 | b := NewFromString(tc.text) |
| 131 | b.SetCursor(Position{Line: 0, Col: tc.from}) |
| 132 | |
| 133 | b.MoveWordLeft() |
| 134 | |
| 135 | if got := b.Cursor().Col; got != tc.wantCol { |
| 136 | t.Errorf("Cursor().Col = %d, want %d", got, tc.wantCol) |
| 137 | } |
| 138 | }) |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | func TestMoveWordLeftAtTheStartOfTheBufferDoesNothing(t *testing.T) { |
| 143 | b := NewFromString("foo") |
| 144 | b.SetCursor(Position{}) |
| 145 | |
| 146 | b.MoveWordLeft() |
| 147 | |
| 148 | if got := b.Cursor(); got != (Position{}) { |
| 149 | t.Errorf("Cursor() = %+v, want the origin", got) |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | func TestMoveWordRight(t *testing.T) { |
| 154 | tests := []struct { |
| 155 | name string |
| 156 | text string |
| 157 | from int |
| 158 | wantCol int |
| 159 | }{ |
| 160 | {"from the start of a word", "foo bar", 0, 4}, |
| 161 | {"from inside a word", "foo bar", 1, 4}, |
| 162 | {"over several separators", "foo bar", 0, 6}, |
| 163 | {"no word left, stops at the end", "foo bar", 4, 7}, |
| 164 | } |
| 165 | |
| 166 | for _, tc := range tests { |
| 167 | t.Run(tc.name, func(t *testing.T) { |
| 168 | b := NewFromString(tc.text) |
| 169 | b.SetCursor(Position{Line: 0, Col: tc.from}) |
| 170 | |
| 171 | b.MoveWordRight() |
| 172 | |
| 173 | if got := b.Cursor().Col; got != tc.wantCol { |
| 174 | t.Errorf("Cursor().Col = %d, want %d", got, tc.wantCol) |
| 175 | } |
| 176 | }) |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | func TestMoveWordRightAtTheEndOfALineWrapsOver(t *testing.T) { |
| 181 | b := NewFromString("foo\nbar") |
| 182 | b.SetCursor(Position{Line: 0, Col: 3}) |
| 183 | |
| 184 | b.MoveWordRight() |
| 185 | |
| 186 | if got := b.Cursor(); got != (Position{Line: 1, Col: 0}) { |
| 187 | t.Errorf("Cursor() = %+v, want the start of the next line", got) |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | func TestDisplayColumnExpandsTabs(t *testing.T) { |
| 192 | b := NewFromString("\tab\tc") |
| 193 | b.SetTabWidth(4) |
| 194 | |
| 195 | tests := []struct { |
| 196 | runeCol int |
| 197 | screenCol int |
| 198 | }{ |
| 199 | {0, 0}, |
| 200 | {1, 4}, // just after the leading tab |
| 201 | {2, 5}, |
| 202 | {3, 6}, |
| 203 | {4, 8}, // the second tab fills columns 6 and 7 |
| 204 | {5, 9}, |
| 205 | } |
| 206 | |
| 207 | for _, tc := range tests { |
| 208 | if got := b.DisplayColumn(0, tc.runeCol); got != tc.screenCol { |
| 209 | t.Errorf("DisplayColumn(0, %d) = %d, want %d", tc.runeCol, got, tc.screenCol) |
| 210 | } |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | func TestDisplayColumnClampsItsArguments(t *testing.T) { |
| 215 | b := NewFromString("ab") |
| 216 | |
| 217 | if got := b.DisplayColumn(0, 99); got != 2 { |
| 218 | t.Errorf("DisplayColumn(0, 99) = %d, want 2", got) |
| 219 | } |
| 220 | if got := b.DisplayColumn(0, -1); got != 0 { |
| 221 | t.Errorf("DisplayColumn(0, -1) = %d, want 0", got) |
| 222 | } |
| 223 | if got := b.DisplayColumn(99, 0); got != 0 { |
| 224 | t.Errorf("DisplayColumn(99, 0) = %d, want 0", got) |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | func TestRuneColumnIsTheInverseOfDisplayColumn(t *testing.T) { |
| 229 | b := NewFromString("\tab\tc") |
| 230 | b.SetTabWidth(4) |
| 231 | |
| 232 | for runeCol := 0; runeCol <= b.LineLen(0); runeCol++ { |
| 233 | screenCol := b.DisplayColumn(0, runeCol) |
| 234 | if got := b.RuneColumn(0, screenCol); got != runeCol { |
| 235 | t.Errorf("RuneColumn(0, DisplayColumn(0, %d)=%d) = %d, want %d", |
| 236 | runeCol, screenCol, got, runeCol) |
| 237 | } |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | func TestRuneColumnInsideATabPicksThatTab(t *testing.T) { |
| 242 | b := NewFromString("\tx") |
| 243 | b.SetTabWidth(4) |
| 244 | |
| 245 | for screenCol := 0; screenCol < 4; screenCol++ { |
| 246 | if got := b.RuneColumn(0, screenCol); got != 0 { |
| 247 | t.Errorf("RuneColumn(0, %d) = %d, want 0 — a click inside a tab lands on it", screenCol, got) |
| 248 | } |
| 249 | } |
| 250 | if got := b.RuneColumn(0, 99); got != 2 { |
| 251 | t.Errorf("RuneColumn(0, 99) = %d, want 2 — past the end lands after the last rune", got) |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | func TestIsWordRuneAcceptsIdentifierCharacters(t *testing.T) { |
| 256 | for _, r := range []rune{'a', 'Z', '0', '_', 'é', 'π'} { |
| 257 | if !IsWordRune(r) { |
| 258 | t.Errorf("IsWordRune(%q) = false, want true", r) |
| 259 | } |
| 260 | } |
| 261 | for _, r := range []rune{' ', '\t', '.', '(', '-'} { |
| 262 | if IsWordRune(r) { |
| 263 | t.Errorf("IsWordRune(%q) = true, want false", r) |
| 264 | } |
| 265 | } |
| 266 | } |