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Optimize the memory usage for syntax highlighting

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This commit is contained in:
Zachary Yedidia 2017-03-21 12:45:27 -04:00
parent 214adcf611
commit 59bf1a2260
4 changed files with 85 additions and 44 deletions
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2
cmd/micro/buffer.go
View file

@ -190,7 +190,7 @@ func (b *Buffer) UpdateRules() {
b.Settings["filetype"] = b.syntaxDef.FileType
b.highlighter = highlight.NewHighlighter(b.syntaxDef)
if b.Settings["syntax"].(bool) {
b.highlighter.Highlight(b, 0)
b.highlighter.HighlightStates(b)
}
}
}

5
cmd/micro/cellview.go
View file

@ -65,9 +65,12 @@ func (c *CellView) Draw(buf *Buffer, top, height, left, width int) {
buf.lines[start-1].rehighlight = false
}
buf.highlighter.ReHighlight(buf, start)
buf.highlighter.ReHighlightStates(buf, start)
}
buf.highlighter.HighlightMatches(buf, top, top+height)
messenger.Message(top, top+height)
c.lines = make([][]*Char, 0)
viewLine := 0

120
cmd/micro/highlight/highlighter.go
View file

@ -18,8 +18,10 @@ func combineLineMatch(src, dst LineMatch) LineMatch {
return dst
}
// A State represents the region at the end of a line
type State *Region
// LineStates is an interface for a buffer-like object which can also store the states and matches for every line
type LineStates interface {
LineData() [][]byte
State(lineN int) State
@ -27,20 +29,24 @@ type LineStates interface {
SetMatch(lineN int, m LineMatch)
}
// A Highlighter contains the information needed to highlight a string
type Highlighter struct {
lastRegion *Region
def *Def
}
// NewHighlighter returns a new highlighter from the given syntax definition
func NewHighlighter(def *Def) *Highlighter {
h := new(Highlighter)
h.def = def
return h
}
// LineMatch represents the syntax highlighting matches for one line. Each index where the coloring is changed is marked with that
// color's group (represented as one byte)
type LineMatch map[int]uint8
func FindIndex(regex *regexp.Regexp, str []byte, canMatchStart, canMatchEnd bool) []int {
func findIndex(regex *regexp.Regexp, str []byte, canMatchStart, canMatchEnd bool) []int {
regexStr := regex.String()
if strings.Contains(regexStr, "^") {
if !canMatchStart {
@ -55,7 +61,7 @@ func FindIndex(regex *regexp.Regexp, str []byte, canMatchStart, canMatchEnd bool
return regex.FindIndex(str)
}
func FindAllIndex(regex *regexp.Regexp, str []byte, canMatchStart, canMatchEnd bool) [][]int {
func findAllIndex(regex *regexp.Regexp, str []byte, canMatchStart, canMatchEnd bool) [][]int {
regexStr := regex.String()
if strings.Contains(regexStr, "^") {
if !canMatchStart {
@ -77,7 +83,7 @@ func (h *Highlighter) highlightRegion(start int, canMatchEnd bool, lineNum int,
highlights[0] = region.group
}
loc := FindIndex(region.end, line, start == 0, canMatchEnd)
loc := findIndex(region.end, line, start == 0, canMatchEnd)
if loc != nil {
if region.parent == nil {
highlights[start+loc[1]] = 0
@ -102,7 +108,7 @@ func (h *Highlighter) highlightRegion(start int, canMatchEnd bool, lineNum int,
firstLoc := []int{len(line), 0}
var firstRegion *Region
for _, r := range region.rules.regions {
loc := FindIndex(r.start, line, start == 0, canMatchEnd)
loc := findIndex(r.start, line, start == 0, canMatchEnd)
if loc != nil {
if loc[0] < firstLoc[0] {
firstLoc = loc
@ -118,7 +124,7 @@ func (h *Highlighter) highlightRegion(start int, canMatchEnd bool, lineNum int,
}
for _, p := range region.rules.patterns {
matches := FindAllIndex(p.regex, line, start == 0, canMatchEnd)
matches := findAllIndex(p.regex, line, start == 0, canMatchEnd)
for _, m := range matches {
highlights[start+m[0]] = p.group
if _, ok := highlights[start+m[1]]; !ok {
@ -146,7 +152,7 @@ func (h *Highlighter) highlightEmptyRegion(start int, canMatchEnd bool, lineNum
firstLoc := []int{len(line), 0}
var firstRegion *Region
for _, r := range h.def.rules.regions {
loc := FindIndex(r.start, line, start == 0, canMatchEnd)
loc := findIndex(r.start, line, start == 0, canMatchEnd)
if loc != nil {
if loc[0] < firstLoc[0] {
firstLoc = loc
@ -162,7 +168,7 @@ func (h *Highlighter) highlightEmptyRegion(start int, canMatchEnd bool, lineNum
}
for _, p := range h.def.rules.patterns {
matches := FindAllIndex(p.regex, line, start == 0, canMatchEnd)
matches := findAllIndex(p.regex, line, start == 0, canMatchEnd)
for _, m := range matches {
highlights[start+m[0]] = p.group
if _, ok := highlights[start+m[1]]; !ok {
@ -178,6 +184,10 @@ func (h *Highlighter) highlightEmptyRegion(start int, canMatchEnd bool, lineNum
return highlights
}
// HighlightString syntax highlights a string
// Use this function for simple syntax highlighting and use the other functions for
// more advanced syntax highlighting. They are optimized for quick rehighlighting of the same
// text with minor changes made
func (h *Highlighter) HighlightString(input string) []LineMatch {
lines := strings.Split(input, "\n")
var lineMatches []LineMatch
@ -195,26 +205,82 @@ func (h *Highlighter) HighlightString(input string) []LineMatch {
return lineMatches
}
func (h *Highlighter) Highlight(input LineStates, startline int) {
// HighlightStates correctly sets all states for the buffer
func (h *Highlighter) HighlightStates(input LineStates) {
lines := input.LineData()
for i := startline; i < len(lines); i++ {
for i := 0; i < len(lines); i++ {
line := []byte(lines[i])
var match LineMatch
if i == 0 || h.lastRegion == nil {
match = h.highlightEmptyRegion(0, true, i, line)
h.highlightEmptyRegion(0, true, i, line)
} else {
match = h.highlightRegion(0, true, i, line, h.lastRegion)
h.highlightRegion(0, true, i, line, h.lastRegion)
}
curState := h.lastRegion
input.SetMatch(i, match)
input.SetState(i, curState)
}
}
// HighlightMatches sets the matches for each line in between startline and endline
// It sets all other matches in the buffer to nil to conserve memory
// This assumes that all the states are set correctly
func (h *Highlighter) HighlightMatches(input LineStates, startline, endline int) {
lines := input.LineData()
for i := 0; i < len(lines); i++ {
if i >= startline && i < endline {
line := []byte(lines[i])
var match LineMatch
if i == 0 || input.State(i-1) == nil {
match = h.highlightEmptyRegion(0, true, i, line)
} else {
match = h.highlightRegion(0, true, i, line, input.State(i-1))
}
input.SetMatch(i, match)
} else {
input.SetMatch(i, nil)
}
}
}
// ReHighlightStates will scan down from `startline` and set the appropriate end of line state
// for each line until it comes across the same state in two consecutive lines
func (h *Highlighter) ReHighlightStates(input LineStates, startline int) {
lines := input.LineData()
h.lastRegion = nil
if startline > 0 {
h.lastRegion = input.State(startline - 1)
}
for i := startline; i < len(lines); i++ {
line := []byte(lines[i])
// var match LineMatch
if i == 0 || h.lastRegion == nil {
h.highlightEmptyRegion(0, true, i, line)
} else {
h.highlightRegion(0, true, i, line, h.lastRegion)
}
curState := h.lastRegion
lastState := input.State(i)
// if i < endline {
// input.SetMatch(i, match)
// }
input.SetState(i, curState)
if curState == lastState {
break
}
}
}
// ReHighlightLine will rehighlight the state and match for a single line
func (h *Highlighter) ReHighlightLine(input LineStates, lineN int) {
lines := input.LineData()
@ -236,31 +302,3 @@ func (h *Highlighter) ReHighlightLine(input LineStates, lineN int) {
input.SetMatch(lineN, match)
input.SetState(lineN, curState)
}
func (h *Highlighter) ReHighlight(input LineStates, startline int) {
lines := input.LineData()
h.lastRegion = nil
if startline > 0 {
h.lastRegion = input.State(startline - 1)
}
for i := startline; i < len(lines); i++ {
line := []byte(lines[i])
var match LineMatch
if i == 0 || h.lastRegion == nil {
match = h.highlightEmptyRegion(0, true, i, line)
} else {
match = h.highlightRegion(0, true, i, line, h.lastRegion)
}
curState := h.lastRegion
lastState := input.State(i)
input.SetMatch(i, match)
input.SetState(i, curState)
if curState == lastState {
break
}
}
}

2
cmd/micro/settings.go
View file

@ -349,7 +349,7 @@ func SetLocalOption(option, value string, view *View) error {
if !nativeValue.(bool) {
buf.ClearMatches()
} else {
buf.highlighter.Highlight(buf, 0)
buf.highlighter.HighlightStates(buf)
}
}