package main
import (
+ "unicode/utf8"
+
+ runewidth "github.com/mattn/go-runewidth"
"github.com/zyedidia/clipboard"
)
-// The Cursor struct stores the location of the cursor in the view
-// The complicated part about the cursor is storing its location.
-// The cursor must be displayed at an x, y location, but since the buffer
-// uses a rope to store text, to insert text we must have an index. It
-// is also simpler to use character indicies for other tasks such as
-// selection.
+// InBounds returns whether the given location is a valid character position in the given buffer
+func InBounds(pos Loc, buf *Buffer) bool {
+ if pos.Y < 0 || pos.Y >= len(buf.lines) || pos.X < 0 || pos.X > utf8.RuneCount(buf.LineBytes(pos.Y)) {
+ return false
+ }
+
+ return true
+}
+
+// The Cursor struct stores the location of the cursor in the buffer
+// as well as the selection
type Cursor struct {
buf *Buffer
Loc
Num int
}
-// Goto puts the cursor at the given cursor's location and gives the current cursor its selection too
+// Goto puts the cursor at the given cursor's location and gives
+// the current cursor its selection too
func (c *Cursor) Goto(b Cursor) {
c.X, c.Y, c.LastVisualX = b.X, b.Y, b.LastVisualX
c.OrigSelection, c.CurSelection = b.OrigSelection, b.CurSelection
}
-// CopySelection copies the user's selection to either "primary" or "clipboard"
+// GotoLoc puts the cursor at the given cursor's location and gives
+// the current cursor its selection too
+func (c *Cursor) GotoLoc(l Loc) {
+ c.X, c.Y = l.X, l.Y
+ c.LastVisualX = c.GetVisualX()
+}
+
+// GetVisualX returns the x value of the cursor in visual spaces
+func (c *Cursor) GetVisualX() int {
+ if c.X <= 0 {
+ c.X = 0
+ return 0
+ }
+
+ bytes := c.buf.LineBytes(c.Y)
+ tabsize := int(c.buf.Settings["tabsize"].(float64))
+ if c.X > utf8.RuneCount(bytes) {
+ c.X = utf8.RuneCount(bytes) - 1
+ }
+
+ return StringWidth(bytes, c.X, tabsize)
+}
+
+// GetCharPosInLine gets the char position of a visual x y
+// coordinate (this is necessary because tabs are 1 char but
+// 4 visual spaces)
+func (c *Cursor) GetCharPosInLine(b []byte, visualPos int) int {
+ tabsize := int(c.buf.Settings["tabsize"].(float64))
+
+ // Scan rune by rune until we exceed the visual width that we are
+ // looking for. Then we can return the character position we have found
+ i := 0 // char pos
+ width := 0 // string visual width
+ for len(b) > 0 {
+ r, size := utf8.DecodeRune(b)
+ b = b[size:]
+
+ switch r {
+ case '\t':
+ ts := tabsize - (width % tabsize)
+ width += ts
+ default:
+ width += runewidth.RuneWidth(r)
+ }
+
+ i++
+
+ if width >= visualPos {
+ break
+ }
+ }
+
+ return i
+}
+
+// Start moves the cursor to the start of the line it is on
+func (c *Cursor) Start() {
+ c.X = 0
+ c.LastVisualX = c.GetVisualX()
+}
+
+// End moves the cursor to the end of the line it is on
+func (c *Cursor) End() {
+ c.X = utf8.RuneCount(c.buf.LineBytes(c.Y))
+ c.LastVisualX = c.GetVisualX()
+}
+
+// CopySelection copies the user's selection to either "primary"
+// or "clipboard"
func (c *Cursor) CopySelection(target string) {
if c.HasSelection() {
if target != "primary" || c.buf.Settings["useprimary"].(bool) {
- clipboard.WriteAll(c.GetSelection(), target)
+ clipboard.WriteAll(string(c.GetSelection()), target)
}
}
}
}
// GetSelection returns the cursor's selection
-func (c *Cursor) GetSelection() string {
+func (c *Cursor) GetSelection() []byte {
if InBounds(c.CurSelection[0], c.buf) && InBounds(c.CurSelection[1], c.buf) {
if c.CurSelection[0].GreaterThan(c.CurSelection[1]) {
return c.buf.Substr(c.CurSelection[1], c.CurSelection[0])
}
return c.buf.Substr(c.CurSelection[0], c.CurSelection[1])
}
- return ""
+ return []byte{}
}
// SelectLine selects the current line
c.Start()
c.SetSelectionStart(c.Loc)
c.End()
- if c.buf.NumLines-1 > c.Y {
+ if len(c.buf.lines)-1 > c.Y {
c.SetSelectionEnd(c.Loc.Move(1, c.buf))
} else {
c.SetSelectionEnd(c.Loc)
}
}
-// SelectWord selects the word the cursor is currently on
-func (c *Cursor) SelectWord() {
- if len(c.buf.Line(c.Y)) == 0 {
- return
- }
-
- if !IsWordChar(string(c.RuneUnder(c.X))) {
- c.SetSelectionStart(c.Loc)
- c.SetSelectionEnd(c.Loc.Move(1, c.buf))
- c.OrigSelection = c.CurSelection
- return
- }
-
- forward, backward := c.X, c.X
-
- for backward > 0 && IsWordChar(string(c.RuneUnder(backward-1))) {
- backward--
- }
-
- c.SetSelectionStart(Loc{backward, c.Y})
- c.OrigSelection[0] = c.CurSelection[0]
-
- for forward < Count(c.buf.Line(c.Y))-1 && IsWordChar(string(c.RuneUnder(forward+1))) {
- forward++
- }
-
- c.SetSelectionEnd(Loc{forward, c.Y}.Move(1, c.buf))
- c.OrigSelection[1] = c.CurSelection[1]
- c.Loc = c.CurSelection[1]
-}
-
-// AddWordToSelection adds the word the cursor is currently on to the selection
-func (c *Cursor) AddWordToSelection() {
- if c.Loc.GreaterThan(c.OrigSelection[0]) && c.Loc.LessThan(c.OrigSelection[1]) {
- c.CurSelection = c.OrigSelection
- return
- }
-
- if c.Loc.LessThan(c.OrigSelection[0]) {
- backward := c.X
-
- for backward > 0 && IsWordChar(string(c.RuneUnder(backward-1))) {
- backward--
- }
-
- c.SetSelectionStart(Loc{backward, c.Y})
- c.SetSelectionEnd(c.OrigSelection[1])
- }
-
- if c.Loc.GreaterThan(c.OrigSelection[1]) {
- forward := c.X
-
- for forward < Count(c.buf.Line(c.Y))-1 && IsWordChar(string(c.RuneUnder(forward+1))) {
- forward++
- }
-
- c.SetSelectionEnd(Loc{forward, c.Y}.Move(1, c.buf))
- c.SetSelectionStart(c.OrigSelection[0])
- }
-
- c.Loc = c.CurSelection[1]
-}
-
-// SelectTo selects from the current cursor location to the given location
-func (c *Cursor) SelectTo(loc Loc) {
- if loc.GreaterThan(c.OrigSelection[0]) {
- c.SetSelectionStart(c.OrigSelection[0])
- c.SetSelectionEnd(loc)
- } else {
- c.SetSelectionStart(loc)
- c.SetSelectionEnd(c.OrigSelection[0])
- }
-}
-
-// WordRight moves the cursor one word to the right
-func (c *Cursor) WordRight() {
- for IsWhitespace(c.RuneUnder(c.X)) {
- if c.X == Count(c.buf.Line(c.Y)) {
- c.Right()
- return
- }
- c.Right()
- }
- c.Right()
- for IsWordChar(string(c.RuneUnder(c.X))) {
- if c.X == Count(c.buf.Line(c.Y)) {
- return
- }
- c.Right()
- }
-}
-
-// WordLeft moves the cursor one word to the left
-func (c *Cursor) WordLeft() {
- c.Left()
- for IsWhitespace(c.RuneUnder(c.X)) {
- if c.X == 0 {
- return
- }
- c.Left()
- }
- c.Left()
- for IsWordChar(string(c.RuneUnder(c.X))) {
- if c.X == 0 {
- return
- }
- c.Left()
- }
- c.Right()
-}
-
-// RuneUnder returns the rune under the given x position
-func (c *Cursor) RuneUnder(x int) rune {
- line := []rune(c.buf.Line(c.Y))
- if len(line) == 0 {
- return '\n'
- }
- if x >= len(line) {
- return '\n'
- } else if x < 0 {
- x = 0
- }
- return line[x]
-}
-
// UpN moves the cursor up N lines (if possible)
func (c *Cursor) UpN(amount int) {
proposedY := c.Y - amount
if proposedY < 0 {
proposedY = 0
- } else if proposedY >= c.buf.NumLines {
- proposedY = c.buf.NumLines - 1
+ } else if proposedY >= len(c.buf.lines) {
+ proposedY = len(c.buf.lines) - 1
}
- if proposedY == c.Y {
- return
+
+ bytes := c.buf.LineBytes(proposedY)
+ c.X = c.GetCharPosInLine(bytes, c.LastVisualX)
+
+ if c.X > utf8.RuneCount(bytes) || (amount < 0 && proposedY == c.Y) {
+ c.X = utf8.RuneCount(bytes)
}
c.Y = proposedY
- runes := []rune(c.buf.Line(c.Y))
- c.X = c.GetCharPosInLine(c.Y, c.LastVisualX)
- if c.X > len(runes) {
- c.X = len(runes)
- }
}
// DownN moves the cursor down N lines (if possible)
c.DownN(1)
}
-// Left moves the cursor left one cell (if possible) or to the last line if it is at the beginning
+// Left moves the cursor left one cell (if possible) or to
+// the previous line if it is at the beginning
func (c *Cursor) Left() {
if c.Loc == c.buf.Start() {
return
c.LastVisualX = c.GetVisualX()
}
-// Right moves the cursor right one cell (if possible) or to the next line if it is at the end
+// Right moves the cursor right one cell (if possible) or
+// to the next line if it is at the end
func (c *Cursor) Right() {
if c.Loc == c.buf.End() {
return
}
- if c.X < Count(c.buf.Line(c.Y)) {
+ if c.X < utf8.RuneCount(c.buf.LineBytes(c.Y)) {
c.X++
} else {
c.Down()
c.LastVisualX = c.GetVisualX()
}
-// End moves the cursor to the end of the line it is on
-func (c *Cursor) End() {
- c.X = Count(c.buf.Line(c.Y))
- c.LastVisualX = c.GetVisualX()
-}
-
-// Start moves the cursor to the start of the line it is on
-func (c *Cursor) Start() {
- c.X = 0
- c.LastVisualX = c.GetVisualX()
-}
-
-// GetCharPosInLine gets the char position of a visual x y coordinate (this is necessary because tabs are 1 char but 4 visual spaces)
-func (c *Cursor) GetCharPosInLine(lineNum, visualPos int) int {
- // Get the tab size
- tabSize := int(c.buf.Settings["tabsize"].(float64))
- visualLineLen := StringWidth(c.buf.Line(lineNum), tabSize)
- if visualPos > visualLineLen {
- visualPos = visualLineLen
- }
- width := WidthOfLargeRunes(c.buf.Line(lineNum), tabSize)
- if visualPos >= width {
- return visualPos - width
- }
- return visualPos / tabSize
-}
-
-// GetVisualX returns the x value of the cursor in visual spaces
-func (c *Cursor) GetVisualX() int {
- runes := []rune(c.buf.Line(c.Y))
- tabSize := int(c.buf.Settings["tabsize"].(float64))
- if c.X > len(runes) {
- c.X = len(runes) - 1
- }
-
- if c.X < 0 {
- c.X = 0
- }
-
- return StringWidth(string(runes[:c.X]), tabSize)
-}
-
-// StoreVisualX stores the current visual x value in the cursor
-func (c *Cursor) StoreVisualX() {
- c.LastVisualX = c.GetVisualX()
-}
-
-// Relocate makes sure that the cursor is inside the bounds of the buffer
-// If it isn't, it moves it to be within the buffer's lines
+// Relocate makes sure that the cursor is inside the bounds
+// of the buffer If it isn't, it moves it to be within the
+// buffer's lines
func (c *Cursor) Relocate() {
if c.Y < 0 {
c.Y = 0
- } else if c.Y >= c.buf.NumLines {
- c.Y = c.buf.NumLines - 1
+ } else if c.Y >= len(c.buf.lines) {
+ c.Y = len(c.buf.lines) - 1
}
if c.X < 0 {
c.X = 0
- } else if c.X > Count(c.buf.Line(c.Y)) {
- c.X = Count(c.buf.Line(c.Y))
+ } else if c.X > utf8.RuneCount(c.buf.LineBytes(c.Y)) {
+ c.X = utf8.RuneCount(c.buf.LineBytes(c.Y))
}
}
projects / micro.git / blobdiff