import { getContextBefore, highlightLine, processLine } from "../line/highlight.js"
import { copyState } from "../modes.js"
import { bind } from "../util/misc.js"
import { runInOp } from "./operations.js"
import { regLineChange } from "./view_tracking.js"
// HIGHLIGHT WORKER
export function startWorker(cm, time) {
if (cm.doc.highlightFrontier < cm.display.viewTo)
cm.state.highlight.set(time, bind(highlightWorker, cm))
}
function highlightWorker(cm) {
let doc = cm.doc
if (doc.highlightFrontier >= cm.display.viewTo) return
let end = +new Date + cm.options.workTime
let context = getContextBefore(cm, doc.highlightFrontier)
let changedLines = []
doc.iter(context.line, Math.min(doc.first + doc.size, cm.display.viewTo + 500), line => {
if (context.line >= cm.display.viewFrom) { // Visible
let oldStyles = line.styles
let resetState = line.text.length > cm.options.maxHighlightLength ? copyState(doc.mode, context.state) : null
let highlighted = highlightLine(cm, line, context, true)
if (resetState) context.state = resetState
line.styles = highlighted.styles
let oldCls = line.styleClasses, newCls = highlighted.classes
if (newCls) line.styleClasses = newCls
else if (oldCls) line.styleClasses = null
let ischange = !oldStyles || oldStyles.length != line.styles.length ||
oldCls != newCls && (!oldCls || !newCls || oldCls.bgClass != newCls.bgClass || oldCls.textClass != newCls.textClass)
for (let i = 0; !ischange && i < oldStyles.length; ++i) ischange = oldStyles[i] != line.styles[i]
if (ischange) changedLines.push(context.line)
line.stateAfter = context.save()
context.nextLine()
} else {
if (line.text.length <= cm.options.maxHighlightLength)
processLine(cm, line.text, context)
line.stateAfter = context.line % 5 == 0 ? context.save() : null
context.nextLine()
}
if (+new Date > end) {
startWorker(cm, cm.options.workDelay)
return true
}
})
doc.highlightFrontier = context.line
doc.modeFrontier = Math.max(doc.modeFrontier, context.line)
if (changedLines.length) runInOp(cm, () => {
for (let i = 0; i < changedLines.length; i++)
regLineChange(cm, changedLines[i], "text")
})
}
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