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package buffer
import "testing"
func TestSetCursorClampsIntoTheBuffer(t *testing.T) {
b := NewFromString("ab\ncdef")
tests := []struct {
name string
give Position
want Position
}{
{"past the end of a line", Position{Line: 0, Col: 99}, Position{Line: 0, Col: 2}},
{"past the last line", Position{Line: 99, Col: 0}, Position{Line: 1, Col: 4}},
{"negative line", Position{Line: -1, Col: 3}, Position{Line: 0, Col: 0}},
{"negative column", Position{Line: 1, Col: -3}, Position{Line: 1, Col: 0}},
{"already valid", Position{Line: 1, Col: 2}, Position{Line: 1, Col: 2}},
}
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
b.SetCursor(tc.give)
if got := b.Cursor(); got != tc.want {
t.Errorf("SetCursor(%+v) left the cursor at %+v, want %+v", tc.give, got, tc.want)
}
})
}
}
func TestMoveLeftWrapsOntoThePreviousLine(t *testing.T) {
b := NewFromString("ab\ncd")
b.SetCursor(Position{Line: 1, Col: 0})
b.MoveLeft()
if got := b.Cursor(); got != (Position{Line: 0, Col: 2}) {
t.Errorf("Cursor() = %+v, want the end of line 0", got)
}
}
func TestMoveLeftStopsAtTheStartOfTheBuffer(t *testing.T) {
b := NewFromString("ab")
b.SetCursor(Position{})
b.MoveLeft()
if got := b.Cursor(); got != (Position{}) {
t.Errorf("Cursor() = %+v, want it to stay at the origin", got)
}
}
func TestMoveRightWrapsOntoTheNextLine(t *testing.T) {
b := NewFromString("ab\ncd")
b.SetCursor(Position{Line: 0, Col: 2})
b.MoveRight()
if got := b.Cursor(); got != (Position{Line: 1, Col: 0}) {
t.Errorf("Cursor() = %+v, want the start of line 1", got)
}
}
func TestMoveRightStopsAtTheEndOfTheBuffer(t *testing.T) {
b := NewFromString("ab")
b.MoveBufferEnd()
b.MoveRight()
if got := b.Cursor(); got != (Position{Line: 0, Col: 2}) {
t.Errorf("Cursor() = %+v, want it to stay at the end", got)
}
}
func TestMoveUpAndDownClampTheColumn(t *testing.T) {
b := NewFromString("longer line\nab")
b.SetCursor(Position{Line: 0, Col: 9})
b.MoveDown()
if got := b.Cursor(); got != (Position{Line: 1, Col: 2}) {
t.Errorf("after MoveDown, Cursor() = %+v, want the column clamped to 2", got)
}
b.MoveUp()
if got := b.Cursor(); got != (Position{Line: 0, Col: 2}) {
t.Errorf("after MoveUp, Cursor() = %+v, want the clamped column kept", got)
}
}
func TestMoveToLineAndBufferBounds(t *testing.T) {
b := NewFromString("abc\ndefgh")
b.SetCursor(Position{Line: 1, Col: 2})
b.MoveLineStart()
if got := b.Cursor(); got != (Position{Line: 1, Col: 0}) {
t.Errorf("MoveLineStart left the cursor at %+v", got)
}
b.MoveLineEnd()
if got := b.Cursor(); got != (Position{Line: 1, Col: 5}) {
t.Errorf("MoveLineEnd left the cursor at %+v", got)
}
b.MoveBufferStart()
if got := b.Cursor(); got != (Position{}) {
t.Errorf("MoveBufferStart left the cursor at %+v", got)
}
b.MoveBufferEnd()
if got := b.Cursor(); got != (Position{Line: 1, Col: 5}) {
t.Errorf("MoveBufferEnd left the cursor at %+v", got)
}
}
func TestMoveWordLeft(t *testing.T) {
tests := []struct {
name string
text string
from int
wantCol int
}{
{"from the end of a word", "foo bar", 7, 4},
{"from the start of a word", "foo bar", 4, 0},
{"over several separators", "foo bar", 9, 6},
{"from just after separators", "foo bar", 6, 0},
{"punctuation is a separator", "a.b", 3, 2},
}
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
b := NewFromString(tc.text)
b.SetCursor(Position{Line: 0, Col: tc.from})
b.MoveWordLeft()
if got := b.Cursor().Col; got != tc.wantCol {
t.Errorf("Cursor().Col = %d, want %d", got, tc.wantCol)
}
})
}
}
func TestMoveWordLeftAtTheStartOfTheBufferDoesNothing(t *testing.T) {
b := NewFromString("foo")
b.SetCursor(Position{})
b.MoveWordLeft()
if got := b.Cursor(); got != (Position{}) {
t.Errorf("Cursor() = %+v, want the origin", got)
}
}
func TestMoveWordRight(t *testing.T) {
tests := []struct {
name string
text string
from int
wantCol int
}{
{"from the start of a word", "foo bar", 0, 4},
{"from inside a word", "foo bar", 1, 4},
{"over several separators", "foo bar", 0, 6},
{"no word left, stops at the end", "foo bar", 4, 7},
}
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
b := NewFromString(tc.text)
b.SetCursor(Position{Line: 0, Col: tc.from})
b.MoveWordRight()
if got := b.Cursor().Col; got != tc.wantCol {
t.Errorf("Cursor().Col = %d, want %d", got, tc.wantCol)
}
})
}
}
func TestMoveWordRightAtTheEndOfALineWrapsOver(t *testing.T) {
b := NewFromString("foo\nbar")
b.SetCursor(Position{Line: 0, Col: 3})
b.MoveWordRight()
if got := b.Cursor(); got != (Position{Line: 1, Col: 0}) {
t.Errorf("Cursor() = %+v, want the start of the next line", got)
}
}
func TestDisplayColumnExpandsTabs(t *testing.T) {
b := NewFromString("\tab\tc")
b.SetTabWidth(4)
tests := []struct {
runeCol int
screenCol int
}{
{0, 0},
{1, 4}, // just after the leading tab
{2, 5},
{3, 6},
{4, 8}, // the second tab fills columns 6 and 7
{5, 9},
}
for _, tc := range tests {
if got := b.DisplayColumn(0, tc.runeCol); got != tc.screenCol {
t.Errorf("DisplayColumn(0, %d) = %d, want %d", tc.runeCol, got, tc.screenCol)
}
}
}
func TestDisplayColumnClampsItsArguments(t *testing.T) {
b := NewFromString("ab")
if got := b.DisplayColumn(0, 99); got != 2 {
t.Errorf("DisplayColumn(0, 99) = %d, want 2", got)
}
if got := b.DisplayColumn(0, -1); got != 0 {
t.Errorf("DisplayColumn(0, -1) = %d, want 0", got)
}
if got := b.DisplayColumn(99, 0); got != 0 {
t.Errorf("DisplayColumn(99, 0) = %d, want 0", got)
}
}
func TestRuneColumnIsTheInverseOfDisplayColumn(t *testing.T) {
b := NewFromString("\tab\tc")
b.SetTabWidth(4)
for runeCol := 0; runeCol <= b.LineLen(0); runeCol++ {
screenCol := b.DisplayColumn(0, runeCol)
if got := b.RuneColumn(0, screenCol); got != runeCol {
t.Errorf("RuneColumn(0, DisplayColumn(0, %d)=%d) = %d, want %d",
runeCol, screenCol, got, runeCol)
}
}
}
func TestRuneColumnInsideATabPicksThatTab(t *testing.T) {
b := NewFromString("\tx")
b.SetTabWidth(4)
for screenCol := 0; screenCol < 4; screenCol++ {
if got := b.RuneColumn(0, screenCol); got != 0 {
t.Errorf("RuneColumn(0, %d) = %d, want 0 — a click inside a tab lands on it", screenCol, got)
}
}
if got := b.RuneColumn(0, 99); got != 2 {
t.Errorf("RuneColumn(0, 99) = %d, want 2 — past the end lands after the last rune", got)
}
}
func TestIsWordRuneAcceptsIdentifierCharacters(t *testing.T) {
for _, r := range []rune{'a', 'Z', '0', '_', 'é', 'π'} {
if !IsWordRune(r) {
t.Errorf("IsWordRune(%q) = false, want true", r)
}
}
for _, r := range []rune{' ', '\t', '.', '(', '-'} {
if IsWordRune(r) {
t.Errorf("IsWordRune(%q) = true, want false", r)
}
}
}
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