10 "github.com/zyedidia/micro/pkg/highlight"
13 // Finds the byte index of the nth rune in a byte slice
14 func runeToByteIndex(n int, txt []byte) int {
22 _, size := utf8.DecodeRune(txt)
35 // A Line contains the data in bytes as well as a highlight state, match
36 // and a flag for whether the highlighting needs to be updated
41 match highlight.LineMatch
47 // Line ending file formats
48 FFAuto = 0 // Autodetect format
49 FFUnix = 1 // LF line endings (unix style '\n')
50 FFDos = 2 // CRLF line endings (dos style '\r\n')
55 // A LineArray simply stores and array of lines and makes it easy to insert
57 type LineArray struct {
63 // Append efficiently appends lines together
64 // It allocates an additional 10000 lines if the original estimate
66 func Append(slice []Line, data ...Line) []Line {
68 if l+len(data) > cap(slice) { // reallocate
69 newSlice := make([]Line, (l+len(data))+10000)
73 slice = slice[0 : l+len(data)]
74 for i, c := range data {
80 // NewLineArray returns a new line array from an array of bytes
81 func NewLineArray(size uint64, endings FileFormat, reader io.Reader) *LineArray {
84 la.lines = make([]Line, 0, 1000)
87 br := bufio.NewReader(reader)
92 data, err := br.ReadBytes('\n')
93 // Detect the line ending by checking to see if there is a '\r' char
95 // Even if the file format is set to DOS, the '\r' is removed so
96 // that all lines end with '\n'
98 if dlen > 1 && data[dlen-2] == '\r' {
99 data = append(data[:dlen-2], '\n')
100 if endings == FFAuto {
105 if endings == FFAuto {
110 // If we are loading a large file (greater than 1000) we use the file
111 // size and the length of the first 1000 lines to try to estimate
112 // how many lines will need to be allocated for the rest of the file
113 // We add an extra 10000 to the original estimate to be safe and give
114 // plenty of room for expansion
115 if n >= 1000 && loaded >= 0 {
116 totalLinesNum := int(float64(size) * (float64(n) / float64(loaded)))
117 newSlice := make([]Line, len(la.lines), totalLinesNum+10000)
118 copy(newSlice, la.lines)
123 // Counter for the number of bytes in the first 1000 lines
130 la.lines = Append(la.lines, Line{
137 // Last line was read
140 la.lines = Append(la.lines, Line{
153 // Bytes returns the string that should be written to disk when
154 // the line array is saved
155 func (la *LineArray) Bytes() []byte {
156 b := new(bytes.Buffer)
157 // initsize should provide a good estimate
158 b.Grow(int(la.initsize + 4096))
159 for i, l := range la.lines {
161 if i != len(la.lines)-1 {
162 if la.Endings == FFDos {
171 // newlineBelow adds a newline below the given line number
172 func (la *LineArray) newlineBelow(y int) {
173 la.lines = append(la.lines, Line{
179 copy(la.lines[y+2:], la.lines[y+1:])
180 la.lines[y+1] = Line{
182 state: la.lines[y].state,
188 // Inserts a byte array at a given location
189 func (la *LineArray) insert(pos Loc, value []byte) {
190 x, y := runeToByteIndex(pos.X, la.lines[pos.Y].data), pos.Y
191 for i := 0; i < len(value); i++ {
192 if value[i] == '\n' {
198 la.insertByte(Loc{x, y}, value[i])
203 // InsertByte inserts a byte at a given location
204 func (la *LineArray) insertByte(pos Loc, value byte) {
205 la.lines[pos.Y].data = append(la.lines[pos.Y].data, 0)
206 copy(la.lines[pos.Y].data[pos.X+1:], la.lines[pos.Y].data[pos.X:])
207 la.lines[pos.Y].data[pos.X] = value
210 // joinLines joins the two lines a and b
211 func (la *LineArray) joinLines(a, b int) {
212 la.insert(Loc{len(la.lines[a].data), a}, la.lines[b].data)
216 // split splits a line at a given position
217 func (la *LineArray) split(pos Loc) {
218 la.newlineBelow(pos.Y)
219 la.insert(Loc{0, pos.Y + 1}, la.lines[pos.Y].data[pos.X:])
220 la.lines[pos.Y+1].state = la.lines[pos.Y].state
221 la.lines[pos.Y].state = nil
222 la.lines[pos.Y].match = nil
223 la.lines[pos.Y+1].match = nil
224 la.lines[pos.Y].rehighlight = true
225 la.deleteToEnd(Loc{pos.X, pos.Y})
228 // removes from start to end
229 func (la *LineArray) remove(start, end Loc) []byte {
230 sub := la.Substr(start, end)
231 startX := runeToByteIndex(start.X, la.lines[start.Y].data)
232 endX := runeToByteIndex(end.X, la.lines[end.Y].data)
233 if start.Y == end.Y {
234 la.lines[start.Y].data = append(la.lines[start.Y].data[:startX], la.lines[start.Y].data[endX:]...)
236 la.deleteLines(start.Y+1, end.Y-1)
237 la.deleteToEnd(Loc{startX, start.Y})
238 la.deleteFromStart(Loc{endX - 1, start.Y + 1})
239 la.joinLines(start.Y, start.Y+1)
244 // deleteToEnd deletes from the end of a line to the position
245 func (la *LineArray) deleteToEnd(pos Loc) {
246 la.lines[pos.Y].data = la.lines[pos.Y].data[:pos.X]
249 // deleteFromStart deletes from the start of a line to the position
250 func (la *LineArray) deleteFromStart(pos Loc) {
251 la.lines[pos.Y].data = la.lines[pos.Y].data[pos.X+1:]
254 // deleteLine deletes the line number
255 func (la *LineArray) deleteLine(y int) {
256 la.lines = la.lines[:y+copy(la.lines[y:], la.lines[y+1:])]
259 func (la *LineArray) deleteLines(y1, y2 int) {
260 la.lines = la.lines[:y1+copy(la.lines[y1:], la.lines[y2+1:])]
263 // DeleteByte deletes the byte at a position
264 func (la *LineArray) deleteByte(pos Loc) {
265 la.lines[pos.Y].data = la.lines[pos.Y].data[:pos.X+copy(la.lines[pos.Y].data[pos.X:], la.lines[pos.Y].data[pos.X+1:])]
268 // Substr returns the string representation between two locations
269 func (la *LineArray) Substr(start, end Loc) []byte {
270 startX := runeToByteIndex(start.X, la.lines[start.Y].data)
271 endX := runeToByteIndex(end.X, la.lines[end.Y].data)
272 if start.Y == end.Y {
273 src := la.lines[start.Y].data[startX:endX]
274 dest := make([]byte, len(src))
278 str := make([]byte, 0, len(la.lines[start.Y+1].data)*(end.Y-start.Y))
279 str = append(str, la.lines[start.Y].data[startX:]...)
280 str = append(str, '\n')
281 for i := start.Y + 1; i <= end.Y-1; i++ {
282 str = append(str, la.lines[i].data...)
283 str = append(str, '\n')
285 str = append(str, la.lines[end.Y].data[:endX]...)
289 // LinesNum returns the number of lines in the buffer
290 func (la *LineArray) LinesNum() int {
294 // Start returns the start of the buffer
295 func (la *LineArray) Start() Loc {
299 // End returns the location of the last character in the buffer
300 func (la *LineArray) End() Loc {
301 numlines := len(la.lines)
302 return Loc{utf8.RuneCount(la.lines[numlines-1].data), numlines - 1}
305 // LineBytes returns line n as an array of bytes
306 func (la *LineArray) LineBytes(n int) []byte {
307 if n >= len(la.lines) || n < 0 {
310 return la.lines[n].data
313 // State gets the highlight state for the given line number
314 func (la *LineArray) State(lineN int) highlight.State {
315 la.lines[lineN].lock.Lock()
316 defer la.lines[lineN].lock.Unlock()
317 return la.lines[lineN].state
320 // SetState sets the highlight state at the given line number
321 func (la *LineArray) SetState(lineN int, s highlight.State) {
322 la.lines[lineN].lock.Lock()
323 defer la.lines[lineN].lock.Unlock()
324 la.lines[lineN].state = s
327 // SetMatch sets the match at the given line number
328 func (la *LineArray) SetMatch(lineN int, m highlight.LineMatch) {
329 la.lines[lineN].lock.Lock()
330 defer la.lines[lineN].lock.Unlock()
331 la.lines[lineN].match = m
334 // Match retrieves the match for the given line number
335 func (la *LineArray) Match(lineN int) highlight.LineMatch {
336 la.lines[lineN].lock.Lock()
337 defer la.lines[lineN].lock.Unlock()
338 return la.lines[lineN].match
341 func (la *LineArray) Rehighlight(lineN int) bool {
342 la.lines[lineN].lock.Lock()
343 defer la.lines[lineN].lock.Unlock()
344 return la.lines[lineN].rehighlight
347 func (la *LineArray) SetRehighlight(lineN int, on bool) {
348 la.lines[lineN].lock.Lock()
349 defer la.lines[lineN].lock.Unlock()
350 la.lines[lineN].rehighlight = on