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package buffer
import (
"github.com/zyedidia/micro/v2/internal/util"
)
// Loc stores a location
type Loc struct {
X, Y int
}
// LessThan returns true if b is smaller
func (l Loc) LessThan(b Loc) bool {
if l.Y < b.Y {
return true
}
return l.Y == b.Y && l.X < b.X
}
// GreaterThan returns true if b is bigger
func (l Loc) GreaterThan(b Loc) bool {
if l.Y > b.Y {
return true
}
return l.Y == b.Y && l.X > b.X
}
// GreaterEqual returns true if b is greater than or equal to b
func (l Loc) GreaterEqual(b Loc) bool {
if l.Y > b.Y {
return true
}
if l.Y == b.Y && l.X > b.X {
return true
}
return l == b
}
// LessEqual returns true if b is less than or equal to b
func (l Loc) LessEqual(b Loc) bool {
if l.Y < b.Y {
return true
}
if l.Y == b.Y && l.X < b.X {
return true
}
return l == b
}
// Clamp clamps a loc between start and end
func (l Loc) Clamp(start, end Loc) Loc {
if l.GreaterEqual(end) {
return end
} else if l.LessThan(start) {
return start
}
return l
}
// The following functions require a buffer to know where newlines are
// Diff returns the distance between two locations
func DiffLA(a, b Loc, buf *LineArray) int {
if a.Y == b.Y {
if a.X > b.X {
return a.X - b.X
}
return b.X - a.X
}
// Make sure a is guaranteed to be less than b
if b.LessThan(a) {
a, b = b, a
}
loc := 0
for i := a.Y + 1; i < b.Y; i++ {
// + 1 for the newline
loc += util.CharacterCount(buf.LineBytes(i)) + 1
}
loc += util.CharacterCount(buf.LineBytes(a.Y)) - a.X + b.X + 1
return loc
}
// This moves the location one character to the right
func (l Loc) right(buf *LineArray) Loc {
if l == buf.End() {
return Loc{l.X + 1, l.Y}
}
var res Loc
if l.X < util.CharacterCount(buf.LineBytes(l.Y)) {
res = Loc{l.X + 1, l.Y}
} else {
res = Loc{0, l.Y + 1}
}
return res
}
// This moves the given location one character to the left
func (l Loc) left(buf *LineArray) Loc {
if l == buf.Start() {
return Loc{l.X - 1, l.Y}
}
var res Loc
if l.X > 0 {
res = Loc{l.X - 1, l.Y}
} else {
res = Loc{util.CharacterCount(buf.LineBytes(l.Y - 1)), l.Y - 1}
}
return res
}
// MoveLA moves the cursor n characters to the left or right
// It moves the cursor left if n is negative
func (l Loc) MoveLA(n int, buf *LineArray) Loc {
if n > 0 {
for i := 0; i < n; i++ {
l = l.right(buf)
}
return l
}
for i := 0; i < util.Abs(n); i++ {
l = l.left(buf)
}
return l
}
// Diff returns the difference between two locs
func (l Loc) Diff(b Loc, buf *Buffer) int {
return DiffLA(l, b, buf.LineArray)
}
// Move moves a loc n characters
func (l Loc) Move(n int, buf *Buffer) Loc {
return l.MoveLA(n, buf.LineArray)
}
// ByteOffset is just like ToCharPos except it counts bytes instead of runes
func ByteOffset(pos Loc, buf *Buffer) int {
x, y := pos.X, pos.Y
loc := 0
for i := 0; i < y; i++ {
// + 1 for the newline
loc += len(buf.Line(i)) + 1
}
loc += len(buf.Line(y)[:x])
return loc
}
// clamps a loc within a buffer
func clamp(pos Loc, la *LineArray) Loc {
return pos.Clamp(la.Start(), la.End())
}
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