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Viewing file:     deleteNearSelection.js (1.03 KB)      -rw-r--r--

import { runInOp } from "../display/operations.js"
import { ensureCursorVisible } from "../display/scrolling.js"
import { cmp } from "../line/pos.js"
import { replaceRange } from "../model/changes.js"
import { lst } from "../util/misc.js"

// Helper for deleting text near the selection(s), used to implement
// backspace, delete, and similar functionality.
export function deleteNearSelection(cm, compute) {
  let ranges = cm.doc.sel.ranges, kill = []
  // Build up a set of ranges to kill first, merging overlapping
  // ranges.
  for (let i = 0; i < ranges.length; i++) {
    let toKill = compute(ranges[i])
    while (kill.length && cmp(toKill.from, lst(kill).to) <= 0) {
      let replaced = kill.pop()
      if (cmp(replaced.from, toKill.from) < 0) {
        toKill.from = replaced.from
        break
      }
    }
    kill.push(toKill)
  }
  // Next, remove those actual ranges.
  runInOp(cm, () => {
    for (let i = kill.length - 1; i >= 0; i--)
      replaceRange(cm.doc, "", kill[i].from, kill[i].to, "+delete")
    ensureCursorVisible(cm)
  })
}