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import { signalLater } from "../util/operation_group.js"
import { ensureCursorVisible } from "../display/scrolling.js"
import { clipPos, cmp, Pos } from "../line/pos.js"
import { getLine } from "../line/utils_line.js"
import { hasHandler, signal, signalCursorActivity } from "../util/event.js"
import { lst, sel_dontScroll } from "../util/misc.js"
import { addSelectionToHistory } from "./history.js"
import { normalizeSelection, Range, Selection, simpleSelection } from "./selection.js"
// The 'scroll' parameter given to many of these indicated whether
// the new cursor position should be scrolled into view after
// modifying the selection.
// If shift is held or the extend flag is set, extends a range to
// include a given position (and optionally a second position).
// Otherwise, simply returns the range between the given positions.
// Used for cursor motion and such.
export function extendRange(range, head, other, extend) {
if (extend) {
let anchor = range.anchor
if (other) {
let posBefore = cmp(head, anchor) < 0
if (posBefore != (cmp(other, anchor) < 0)) {
anchor = head
head = other
} else if (posBefore != (cmp(head, other) < 0)) {
head = other
}
}
return new Range(anchor, head)
} else {
return new Range(other || head, head)
}
}
// Extend the primary selection range, discard the rest.
export function extendSelection(doc, head, other, options, extend) {
if (extend == null) extend = doc.cm && (doc.cm.display.shift || doc.extend)
setSelection(doc, new Selection([extendRange(doc.sel.primary(), head, other, extend)], 0), options)
}
// Extend all selections (pos is an array of selections with length
// equal the number of selections)
export function extendSelections(doc, heads, options) {
let out = []
let extend = doc.cm && (doc.cm.display.shift || doc.extend)
for (let i = 0; i < doc.sel.ranges.length; i++)
out[i] = extendRange(doc.sel.ranges[i], heads[i], null, extend)
let newSel = normalizeSelection(doc.cm, out, doc.sel.primIndex)
setSelection(doc, newSel, options)
}
// Updates a single range in the selection.
export function replaceOneSelection(doc, i, range, options) {
let ranges = doc.sel.ranges.slice(0)
ranges[i] = range
setSelection(doc, normalizeSelection(doc.cm, ranges, doc.sel.primIndex), options)
}
// Reset the selection to a single range.
export function setSimpleSelection(doc, anchor, head, options) {
setSelection(doc, simpleSelection(anchor, head), options)
}
// Give beforeSelectionChange handlers a change to influence a
// selection update.
function filterSelectionChange(doc, sel, options) {
let obj = {
ranges: sel.ranges,
update: function(ranges) {
this.ranges = []
for (let i = 0; i < ranges.length; i++)
this.ranges[i] = new Range(clipPos(doc, ranges[i].anchor),
clipPos(doc, ranges[i].head))
},
origin: options && options.origin
}
signal(doc, "beforeSelectionChange", doc, obj)
if (doc.cm) signal(doc.cm, "beforeSelectionChange", doc.cm, obj)
if (obj.ranges != sel.ranges) return normalizeSelection(doc.cm, obj.ranges, obj.ranges.length - 1)
else return sel
}
export function setSelectionReplaceHistory(doc, sel, options) {
let done = doc.history.done, last = lst(done)
if (last && last.ranges) {
done[done.length - 1] = sel
setSelectionNoUndo(doc, sel, options)
} else {
setSelection(doc, sel, options)
}
}
// Set a new selection.
export function setSelection(doc, sel, options) {
setSelectionNoUndo(doc, sel, options)
addSelectionToHistory(doc, doc.sel, doc.cm ? doc.cm.curOp.id : NaN, options)
}
export function setSelectionNoUndo(doc, sel, options) {
if (hasHandler(doc, "beforeSelectionChange") || doc.cm && hasHandler(doc.cm, "beforeSelectionChange"))
sel = filterSelectionChange(doc, sel, options)
let bias = options && options.bias ||
(cmp(sel.primary().head, doc.sel.primary().head) < 0 ? -1 : 1)
setSelectionInner(doc, skipAtomicInSelection(doc, sel, bias, true))
if (!(options && options.scroll === false) && doc.cm && doc.cm.getOption("readOnly") != "nocursor")
ensureCursorVisible(doc.cm)
}
function setSelectionInner(doc, sel) {
if (sel.equals(doc.sel)) return
doc.sel = sel
if (doc.cm) {
doc.cm.curOp.updateInput = 1
doc.cm.curOp.selectionChanged = true
signalCursorActivity(doc.cm)
}
signalLater(doc, "cursorActivity", doc)
}
// Verify that the selection does not partially select any atomic
// marked ranges.
export function reCheckSelection(doc) {
setSelectionInner(doc, skipAtomicInSelection(doc, doc.sel, null, false))
}
// Return a selection that does not partially select any atomic
// ranges.
function skipAtomicInSelection(doc, sel, bias, mayClear) {
let out
for (let i = 0; i < sel.ranges.length; i++) {
let range = sel.ranges[i]
let old = sel.ranges.length == doc.sel.ranges.length && doc.sel.ranges[i]
let newAnchor = skipAtomic(doc, range.anchor, old && old.anchor, bias, mayClear)
let newHead = range.head == range.anchor ? newAnchor : skipAtomic(doc, range.head, old && old.head, bias, mayClear)
if (out || newAnchor != range.anchor || newHead != range.head) {
if (!out) out = sel.ranges.slice(0, i)
out[i] = new Range(newAnchor, newHead)
}
}
return out ? normalizeSelection(doc.cm, out, sel.primIndex) : sel
}
function skipAtomicInner(doc, pos, oldPos, dir, mayClear) {
let line = getLine(doc, pos.line)
if (line.markedSpans) for (let i = 0; i < line.markedSpans.length; ++i) {
let sp = line.markedSpans[i], m = sp.marker
// Determine if we should prevent the cursor being placed to the left/right of an atomic marker
// Historically this was determined using the inclusiveLeft/Right option, but the new way to control it
// is with selectLeft/Right
let preventCursorLeft = ("selectLeft" in m) ? !m.selectLeft : m.inclusiveLeft
let preventCursorRight = ("selectRight" in m) ? !m.selectRight : m.inclusiveRight
if ((sp.from == null || (preventCursorLeft ? sp.from <= pos.ch : sp.from < pos.ch)) &&
(sp.to == null || (preventCursorRight ? sp.to >= pos.ch : sp.to > pos.ch))) {
if (mayClear) {
signal(m, "beforeCursorEnter")
if (m.explicitlyCleared) {
if (!line.markedSpans) break
else {--i; continue}
}
}
if (!m.atomic) continue
if (oldPos) {
let near = m.find(dir < 0 ? 1 : -1), diff
if (dir < 0 ? preventCursorRight : preventCursorLeft)
near = movePos(doc, near, -dir, near && near.line == pos.line ? line : null)
if (near && near.line == pos.line && (diff = cmp(near, oldPos)) && (dir < 0 ? diff < 0 : diff > 0))
return skipAtomicInner(doc, near, pos, dir, mayClear)
}
let far = m.find(dir < 0 ? -1 : 1)
if (dir < 0 ? preventCursorLeft : preventCursorRight)
far = movePos(doc, far, dir, far.line == pos.line ? line : null)
return far ? skipAtomicInner(doc, far, pos, dir, mayClear) : null
}
}
return pos
}
// Ensure a given position is not inside an atomic range.
export function skipAtomic(doc, pos, oldPos, bias, mayClear) {
let dir = bias || 1
let found = skipAtomicInner(doc, pos, oldPos, dir, mayClear) ||
(!mayClear && skipAtomicInner(doc, pos, oldPos, dir, true)) ||
skipAtomicInner(doc, pos, oldPos, -dir, mayClear) ||
(!mayClear && skipAtomicInner(doc, pos, oldPos, -dir, true))
if (!found) {
doc.cantEdit = true
return Pos(doc.first, 0)
}
return found
}
function movePos(doc, pos, dir, line) {
if (dir < 0 && pos.ch == 0) {
if (pos.line > doc.first) return clipPos(doc, Pos(pos.line - 1))
else return null
} else if (dir > 0 && pos.ch == (line || getLine(doc, pos.line)).text.length) {
if (pos.line < doc.first + doc.size - 1) return Pos(pos.line + 1, 0)
else return null
} else {
return new Pos(pos.line, pos.ch + dir)
}
}
export function selectAll(cm) {
cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()), sel_dontScroll)
}