General.Web/wwwroot/lib/codemirror-5.31.0/src/line/highlight.js

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import { countColumn } from "../util/misc"
import { copyState, innerMode, startState } from "../modes"
import StringStream from "../util/StringStream"

import { getLine, lineNo } from "./utils_line"
import { clipPos } from "./pos"

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