| Current File : //proc/thread-self/root/usr/share/nodejs/codemirror/src/line/highlight.js |
import { countColumn } from "../util/misc.js"
import { copyState, innerMode, startState } from "../modes.js"
import StringStream from "../util/StringStream.js"
import { getLine, lineNo } from "./utils_line.js"
import { clipPos } from "./pos.js"
class SavedContext {
constructor(state, lookAhead) {
this.state = state
this.lookAhead = lookAhead
}
}
class Context {
constructor(doc, state, line, lookAhead) {
this.state = state
this.doc = doc
this.line = line
this.maxLookAhead = lookAhead || 0
this.baseTokens = null
this.baseTokenPos = 1
}
lookAhead(n) {
let line = this.doc.getLine(this.line + n)
if (line != null && n > this.maxLookAhead) this.maxLookAhead = n
return line
}
baseToken(n) {
if (!this.baseTokens) return null
while (this.baseTokens[this.baseTokenPos] <= n)
this.baseTokenPos += 2
let type = this.baseTokens[this.baseTokenPos + 1]
return {type: type && type.replace(/( |^)overlay .*/, ""),
size: this.baseTokens[this.baseTokenPos] - n}
}
nextLine() {
this.line++
if (this.maxLookAhead > 0) this.maxLookAhead--
}
static fromSaved(doc, saved, line) {
if (saved instanceof SavedContext)
return new Context(doc, copyState(doc.mode, saved.state), line, saved.lookAhead)
else
return new Context(doc, copyState(doc.mode, saved), line)
}
save(copy) {
let state = copy !== false ? copyState(this.doc.mode, this.state) : this.state
return this.maxLookAhead > 0 ? new SavedContext(state, this.maxLookAhead) : state
}
}
// Compute a style array (an array starting with a mode generation
// -- for invalidation -- followed by pairs of end positions and
// style strings), which is used to highlight the tokens on the
// line.
export function highlightLine(cm, line, context, forceToEnd) {
// A styles array always starts with a number identifying the
// mode/overlays that it is based on (for easy invalidation).
let st = [cm.state.modeGen], lineClasses = {}
// Compute the base array of styles
runMode(cm, line.text, cm.doc.mode, context, (end, style) => st.push(end, style),
lineClasses, forceToEnd)
let state = context.state
// Run overlays, adjust style array.
for (let o = 0; o < cm.state.overlays.length; ++o) {
context.baseTokens = st
let overlay = cm.state.overlays[o], i = 1, at = 0
context.state = true
runMode(cm, line.text, overlay.mode, context, (end, style) => {
let start = i
// Ensure there's a token end at the current position, and that i points at it
while (at < end) {
let i_end = st[i]
if (i_end > end)
st.splice(i, 1, end, st[i+1], i_end)
i += 2
at = Math.min(end, i_end)
}
if (!style) return
if (overlay.opaque) {
st.splice(start, i - start, end, "overlay " + style)
i = start + 2
} else {
for (; start < i; start += 2) {
let cur = st[start+1]
st[start+1] = (cur ? cur + " " : "") + "overlay " + style
}
}
}, lineClasses)
context.state = state
context.baseTokens = null
context.baseTokenPos = 1
}
return {styles: st, classes: lineClasses.bgClass || lineClasses.textClass ? lineClasses : null}
}
export function getLineStyles(cm, line, updateFrontier) {
if (!line.styles || line.styles[0] != cm.state.modeGen) {
let context = getContextBefore(cm, lineNo(line))
let resetState = line.text.length > cm.options.maxHighlightLength && copyState(cm.doc.mode, context.state)
let result = highlightLine(cm, line, context)
if (resetState) context.state = resetState
line.stateAfter = context.save(!resetState)
line.styles = result.styles
if (result.classes) line.styleClasses = result.classes
else if (line.styleClasses) line.styleClasses = null
if (updateFrontier === cm.doc.highlightFrontier)
cm.doc.modeFrontier = Math.max(cm.doc.modeFrontier, ++cm.doc.highlightFrontier)
}
return line.styles
}
export function getContextBefore(cm, n, precise) {
let doc = cm.doc, display = cm.display
if (!doc.mode.startState) return new Context(doc, true, n)
let start = findStartLine(cm, n, precise)
let saved = start > doc.first && getLine(doc, start - 1).stateAfter
let context = saved ? Context.fromSaved(doc, saved, start) : new Context(doc, startState(doc.mode), start)
doc.iter(start, n, line => {
processLine(cm, line.text, context)
let pos = context.line
line.stateAfter = pos == n - 1 || pos % 5 == 0 || pos >= display.viewFrom && pos < display.viewTo ? context.save() : null
context.nextLine()
})
if (precise) doc.modeFrontier = context.line
return context
}
// Lightweight form of highlight -- proceed over this line and
// update state, but don't save a style array. Used for lines that
// aren't currently visible.
export function processLine(cm, text, context, startAt) {
let mode = cm.doc.mode
let stream = new StringStream(text, cm.options.tabSize, context)
stream.start = stream.pos = startAt || 0
if (text == "") callBlankLine(mode, context.state)
while (!stream.eol()) {
readToken(mode, stream, context.state)
stream.start = stream.pos
}
}
function callBlankLine(mode, state) {
if (mode.blankLine) return mode.blankLine(state)
if (!mode.innerMode) return
let inner = innerMode(mode, state)
if (inner.mode.blankLine) return inner.mode.blankLine(inner.state)
}
function readToken(mode, stream, state, inner) {
for (let i = 0; i < 10; i++) {
if (inner) inner[0] = innerMode(mode, state).mode
let style = mode.token(stream, state)
if (stream.pos > stream.start) return style
}
throw new Error("Mode " + mode.name + " failed to advance stream.")
}
class Token {
constructor(stream, type, state) {
this.start = stream.start; this.end = stream.pos
this.string = stream.current()
this.type = type || null
this.state = state
}
}
// Utility for getTokenAt and getLineTokens
export function takeToken(cm, pos, precise, asArray) {
let doc = cm.doc, mode = doc.mode, style
pos = clipPos(doc, pos)
let line = getLine(doc, pos.line), context = getContextBefore(cm, pos.line, precise)
let stream = new StringStream(line.text, cm.options.tabSize, context), tokens
if (asArray) tokens = []
while ((asArray || stream.pos < pos.ch) && !stream.eol()) {
stream.start = stream.pos
style = readToken(mode, stream, context.state)
if (asArray) tokens.push(new Token(stream, style, copyState(doc.mode, context.state)))
}
return asArray ? tokens : new Token(stream, style, context.state)
}
function extractLineClasses(type, output) {
if (type) for (;;) {
let lineClass = type.match(/(?:^|\s+)line-(background-)?(\S+)/)
if (!lineClass) break
type = type.slice(0, lineClass.index) + type.slice(lineClass.index + lineClass[0].length)
let prop = lineClass[1] ? "bgClass" : "textClass"
if (output[prop] == null)
output[prop] = lineClass[2]
else if (!(new RegExp("(?:^|\\s)" + lineClass[2] + "(?:$|\\s)")).test(output[prop]))
output[prop] += " " + lineClass[2]
}
return type
}
// Run the given mode's parser over a line, calling f for each token.
function runMode(cm, text, mode, context, f, lineClasses, forceToEnd) {
let flattenSpans = mode.flattenSpans
if (flattenSpans == null) flattenSpans = cm.options.flattenSpans
let curStart = 0, curStyle = null
let stream = new StringStream(text, cm.options.tabSize, context), style
let inner = cm.options.addModeClass && [null]
if (text == "") extractLineClasses(callBlankLine(mode, context.state), lineClasses)
while (!stream.eol()) {
if (stream.pos > cm.options.maxHighlightLength) {
flattenSpans = false
if (forceToEnd) processLine(cm, text, context, stream.pos)
stream.pos = text.length
style = null
} else {
style = extractLineClasses(readToken(mode, stream, context.state, inner), lineClasses)
}
if (inner) {
let mName = inner[0].name
if (mName) style = "m-" + (style ? mName + " " + style : mName)
}
if (!flattenSpans || curStyle != style) {
while (curStart < stream.start) {
curStart = Math.min(stream.start, curStart + 5000)
f(curStart, curStyle)
}
curStyle = style
}
stream.start = stream.pos
}
while (curStart < stream.pos) {
// Webkit seems to refuse to render text nodes longer than 57444
// characters, and returns inaccurate measurements in nodes
// starting around 5000 chars.
let pos = Math.min(stream.pos, curStart + 5000)
f(pos, curStyle)
curStart = pos
}
}
// Finds the line to start with when starting a parse. Tries to
// find a line with a stateAfter, so that it can start with a
// valid state. If that fails, it returns the line with the
// smallest indentation, which tends to need the least context to
// parse correctly.
function findStartLine(cm, n, precise) {
let minindent, minline, doc = cm.doc
let lim = precise ? -1 : n - (cm.doc.mode.innerMode ? 1000 : 100)
for (let search = n; search > lim; --search) {
if (search <= doc.first) return doc.first
let line = getLine(doc, search - 1), after = line.stateAfter
if (after && (!precise || search + (after instanceof SavedContext ? after.lookAhead : 0) <= doc.modeFrontier))
return search
let indented = countColumn(line.text, null, cm.options.tabSize)
if (minline == null || minindent > indented) {
minline = search - 1
minindent = indented
}
}
return minline
}
export function retreatFrontier(doc, n) {
doc.modeFrontier = Math.min(doc.modeFrontier, n)
if (doc.highlightFrontier < n - 10) return
let start = doc.first
for (let line = n - 1; line > start; line--) {
let saved = getLine(doc, line).stateAfter
// change is on 3
// state on line 1 looked ahead 2 -- so saw 3
// test 1 + 2 < 3 should cover this
if (saved && (!(saved instanceof SavedContext) || line + saved.lookAhead < n)) {
start = line + 1
break
}
}
doc.highlightFrontier = Math.min(doc.highlightFrontier, start)
}