import { getStateBefore, highlightLine, processLine } from "../line/highlight"
import { copyState } from "../modes"
import { bind } from "../util/misc"
import { runInOp } from "./operations"
import { regLineChange } from "./view_tracking"
// HIGHLIGHT WORKER
export function startWorker(cm, time) {
if (cm.doc.mode.startState && cm.doc.frontier < cm.display.viewTo)
cm.state.highlight.set(time, bind(highlightWorker, cm))
}
function highlightWorker(cm) {
let doc = cm.doc
if (doc.frontier < doc.first) doc.frontier = doc.first
if (doc.frontier >= cm.display.viewTo) return
let end = +new Date + cm.options.workTime
let state = copyState(doc.mode, getStateBefore(cm, doc.frontier))
let changedLines = []
doc.iter(doc.frontier, Math.min(doc.first + doc.size, cm.display.viewTo + 500), line => {
if (doc.frontier >= cm.display.viewFrom) { // Visible
let oldStyles = line.styles, tooLong = line.text.length > cm.options.maxHighlightLength
let highlighted = highlightLine(cm, line, tooLong ? copyState(doc.mode, state) : state, true)
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(doc.frontier)
line.stateAfter = tooLong ? state : copyState(doc.mode, state)
} else {
if (line.text.length <= cm.options.maxHighlightLength)
processLine(cm, line.text, state)
line.stateAfter = doc.frontier % 5 == 0 ? copyState(doc.mode, state) : null
}
++doc.frontier
if (+new Date > end) {
startWorker(cm, cm.options.workDelay)
return true
}
})
if (changedLines.length) runInOp(cm, () => {
for (let i = 0; i < changedLines.length; i++)
regLineChange(cm, changedLines[i], "text")
})
}