514 lines
14 KiB
JavaScript
514 lines
14 KiB
JavaScript
import * as error from 'lib0/error'
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import {
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getItemCleanStart,
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createID,
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getMovedCoords,
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updateMarkerChanges,
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getState,
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ContentAny,
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ContentBinary,
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ContentType,
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ContentDoc,
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Doc,
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RelativePosition, ID, AbstractContent, ContentMove, Transaction, Item, AbstractType // eslint-disable-line
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} from '../internals.js'
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const lengthExceeded = error.create('Length exceeded!')
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/**
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* @todo rename to walker?
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* @todo check that inserting character one after another always reuses ListIterators
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*/
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export class ListIterator {
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/**
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* @param {AbstractType<any>} type
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*/
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constructor (type) {
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this.type = type
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/**
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* Current index-position
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*/
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this.index = 0
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/**
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* Relative position to the current item (if item.content.length > 1)
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*/
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this.rel = 0
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/**
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* This refers to the current right item, unless reachedEnd is true. Then it refers to the left item.
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*
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* @public
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* @type {Item | null}
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*/
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this.nextItem = type._start
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this.reachedEnd = type._start === null
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/**
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* @type {Item | null}
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*/
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this.currMove = null
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/**
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* @type {Item | null}
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*/
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this.currMoveStart = null
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/**
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* @type {Item | null}
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*/
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this.currMoveEnd = null
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/**
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* @type {Array<{ start: Item | null, end: Item | null, move: Item }>}
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*/
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this.movedStack = []
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}
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clone () {
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const iter = new ListIterator(this.type)
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iter.index = this.index
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iter.rel = this.rel
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iter.nextItem = this.nextItem
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iter.reachedEnd = this.reachedEnd
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iter.currMove = this.currMove
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iter.currMoveStart = this.currMoveStart
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iter.currMoveEnd = this.currMoveEnd
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iter.movedStack = this.movedStack.slice()
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return iter
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}
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/**
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* @type {Item | null}
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*/
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get left () {
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if (this.reachedEnd) {
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return this.nextItem
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} else {
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return this.nextItem && this.nextItem.left
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}
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}
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/**
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* @type {Item | null}
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*/
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get right () {
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if (this.reachedEnd) {
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return null
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} else {
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return this.nextItem
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}
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}
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/**
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* @param {Transaction} tr
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* @param {number} index
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*/
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moveTo (tr, index) {
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const diff = index - this.index
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if (diff > 0) {
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this.forward(tr, diff)
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} else if (diff < 0) {
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this.backward(tr, -diff)
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}
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}
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/**
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* @param {Transaction} tr
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* @param {number} len
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*/
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forward (tr, len) {
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if (this.index + len > this.type._length) {
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throw lengthExceeded
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}
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let item = this.nextItem
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this.index += len
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// @todo this condition is not needed, better to remove it (can always be applied)
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if (this.rel) {
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len += this.rel
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this.rel = 0
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}
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while ((!this.reachedEnd || this.currMove !== null) && (len > 0 || (len === 0 && item && (!item.countable || item.deleted || item === this.currMoveEnd || (this.reachedEnd && this.currMoveEnd === null) || item.moved !== this.currMove)))) {
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if (item === this.currMoveEnd || (this.currMoveEnd === null && this.reachedEnd && this.currMove)) {
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item = /** @type {Item} */ (this.currMove) // we iterate to the right after the current condition
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const { start, end, move } = this.movedStack.pop() || { start: null, end: null, move: null }
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this.currMove = move
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this.currMoveStart = start
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this.currMoveEnd = end
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this.reachedEnd = false
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} else if (item === null) {
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break
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} else if (item.countable && !item.deleted && item.moved === this.currMove && len > 0) {
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len -= item.length
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if (len < 0) {
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this.rel = item.length + len
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len = 0
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break
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}
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} else if (item.content.constructor === ContentMove && item.moved === this.currMove) {
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if (this.currMove) {
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this.movedStack.push({ start: this.currMoveStart, end: this.currMoveEnd, move: this.currMove })
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}
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const { start, end } = getMovedCoords(item.content, tr)
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this.currMove = item
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this.currMoveStart = start
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this.currMoveEnd = end
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item = start
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continue
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}
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if (item.right) {
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item = item.right
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} else {
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this.reachedEnd = true
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}
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}
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this.index -= len
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this.nextItem = item
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return this
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}
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/**
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* @param {Transaction} tr
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*/
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reduceMoves (tr) {
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let item = this.nextItem
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if (item !== null) {
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while (item === this.currMoveStart) {
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item = /** @type {Item} */ (this.currMove) // we iterate to the left after the current condition
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const { start, end, move } = this.movedStack.pop() || { start: null, end: null, move: null }
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this.currMove = move
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this.currMoveStart = start
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this.currMoveEnd = end
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}
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this.nextItem = item
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}
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}
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/**
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* @param {Transaction} tr
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* @param {number} len
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* @return {ListIterator}
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*/
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backward (tr, len) {
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if (this.index - len < 0) {
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throw lengthExceeded
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}
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this.index -= len
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if (this.reachedEnd) {
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const nextItem = /** @type {Item} */ (this.nextItem)
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this.rel = nextItem.countable && !nextItem.deleted ? nextItem.length : 0
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this.reachedEnd = false
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}
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if (this.rel >= len) {
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this.rel -= len
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return this
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}
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let item = this.nextItem
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if (item && item.content.constructor === ContentMove) {
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item = item.left
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} else {
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len += ((item && item.countable && !item.deleted && item.moved === this.currMove) ? item.length : 0) - this.rel
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}
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this.rel = 0
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while (item && len > 0) {
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if (item.countable && !item.deleted && item.moved === this.currMove) {
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len -= item.length
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if (len < 0) {
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this.rel = -len
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len = 0
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}
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if (len === 0) {
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break
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}
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} else if (item.content.constructor === ContentMove && item.moved === this.currMove) {
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if (this.currMove) {
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this.movedStack.push({ start: this.currMoveStart, end: this.currMoveEnd, move: this.currMove })
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}
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const { start, end } = getMovedCoords(item.content, tr)
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this.currMove = item
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this.currMoveStart = start
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this.currMoveEnd = end
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item = start
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continue
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}
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if (item === this.currMoveStart) {
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item = /** @type {Item} */ (this.currMove) // we iterate to the left after the current condition
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const { start, end, move } = this.movedStack.pop() || { start: null, end: null, move: null }
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this.currMove = move
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this.currMoveStart = start
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this.currMoveEnd = end
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}
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item = item.left
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}
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this.nextItem = item
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return this
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}
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/**
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* @template {{length: number}} T
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* @param {Transaction} tr
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* @param {number} len
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* @param {T} value the initial content
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* @param {function(AbstractContent, number, number):T} slice
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* @param {function(T, T): T} concat
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*/
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_slice (tr, len, value, slice, concat) {
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this.index += len
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while (len > 0 && !this.reachedEnd) {
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while (this.nextItem && this.nextItem.countable && !this.reachedEnd && len > 0 && this.nextItem !== this.currMoveEnd) {
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if (!this.nextItem.deleted && this.nextItem.moved === this.currMove) {
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const item = this.nextItem
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const slicedContent = slice(item.content, this.rel, len)
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len -= slicedContent.length
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value = concat(value, slicedContent)
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if (item.length !== slicedContent.length) {
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if (this.rel + slicedContent.length === item.length) {
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this.rel = 0
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} else {
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this.rel += slicedContent.length
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continue // do not iterate to item.right
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}
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}
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}
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if (this.nextItem.right) {
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this.nextItem = this.nextItem.right
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} else {
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this.reachedEnd = true
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}
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}
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if (this.nextItem && (!this.reachedEnd || this.currMove !== null) && len > 0) {
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this.forward(tr, 0)
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}
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}
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if (len < 0) {
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this.index -= len
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}
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return value
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}
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/**
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* @param {Transaction} tr
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* @param {number} len
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*/
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delete (tr, len) {
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const startLength = len
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const sm = this.type._searchMarker
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let item = this.nextItem
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while (len > 0) {
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while (item && !item.deleted && item.countable && !this.reachedEnd && len > 0 && item.moved === this.currMove && item !== this.currMoveEnd) {
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if (this.rel > 0) {
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item = getItemCleanStart(tr, createID(item.id.client, item.id.clock + this.rel))
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this.rel = 0
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}
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if (len < item.length) {
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getItemCleanStart(tr, createID(item.id.client, item.id.clock + len))
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}
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len -= item.length
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item.delete(tr)
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if (item.right) {
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item = item.right
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} else {
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this.reachedEnd = true
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}
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}
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if (len > 0) {
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this.nextItem = item
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this.forward(tr, 0)
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item = this.nextItem
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}
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}
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this.nextItem = item
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if (sm) {
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updateMarkerChanges(sm, this.index, -startLength + len, this)
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}
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}
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/**
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* @param {Transaction} tr
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*/
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_splitRel (tr) {
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if (this.rel > 0) {
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/**
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* @type {ID}
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*/
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const itemid = /** @type {Item} */ (this.nextItem).id
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this.nextItem = getItemCleanStart(tr, createID(itemid.client, itemid.clock + this.rel))
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this.rel = 0
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}
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}
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/**
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* Important: you must update markers after calling this method!
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*
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* @param {Transaction} tr
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* @param {Array<AbstractContent>} content
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*/
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insertContents (tr, content) {
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this.reduceMoves(tr)
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this._splitRel(tr)
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const parent = this.type
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const store = tr.doc.store
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const ownClientId = tr.doc.clientID
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/**
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* @type {Item | null}
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*/
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const right = this.right
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/**
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* @type {Item | null}
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*/
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let left = this.left
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content.forEach(c => {
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left = new Item(createID(ownClientId, getState(store, ownClientId)), left, left && left.lastId, right, right && right.id, parent, null, c)
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left.integrate(tr, 0)
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})
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if (right === null) {
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this.nextItem = left
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this.reachedEnd = true
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} else {
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this.nextItem = right
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}
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}
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/**
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* @param {Transaction} tr
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* @param {RelativePosition} start
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* @param {RelativePosition} end
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*/
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insertMove (tr, start, end) {
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this.insertContents(tr, [new ContentMove(start, end, -1)]) // @todo adjust priority
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// @todo is there a better alrogirthm to update searchmarkers? We could simply remove the markers that are in the updated range.
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// Also note that searchmarkers are updated in insertContents as well.
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const sm = this.type._searchMarker
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if (sm) sm.length = 0
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}
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/**
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* @param {Transaction} tr
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* @param {Array<Object<string,any>|Array<any>|boolean|number|null|string|Uint8Array>} values
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*/
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insertArrayValue (tr, values) {
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this._splitRel(tr)
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const sm = this.type._searchMarker
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/**
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* @type {Array<AbstractContent>}
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*/
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const contents = []
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/**
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* @type {Array<Object|Array<any>|number|null>}
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*/
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let jsonContent = []
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const packJsonContent = () => {
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if (jsonContent.length > 0) {
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contents.push(new ContentAny(jsonContent))
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jsonContent = []
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}
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}
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values.forEach(c => {
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if (c === null) {
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jsonContent.push(c)
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} else {
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switch (c.constructor) {
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case Number:
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case Object:
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case Boolean:
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case Array:
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case String:
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jsonContent.push(c)
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break
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default:
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packJsonContent()
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switch (c.constructor) {
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case Uint8Array:
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case ArrayBuffer:
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contents.push(new ContentBinary(new Uint8Array(/** @type {Uint8Array} */ (c))))
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break
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case Doc:
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contents.push(new ContentDoc(/** @type {Doc} */ (c)))
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break
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default:
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if (c instanceof AbstractType) {
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contents.push(new ContentType(c))
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} else {
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throw new Error('Unexpected content type in insert operation')
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}
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}
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}
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}
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})
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packJsonContent()
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this.insertContents(tr, contents)
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this.index += values.length
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if (sm) {
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updateMarkerChanges(sm, this.index - values.length, values.length, this)
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}
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}
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/**
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* @param {Transaction} tr
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* @param {number} len
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*/
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slice (tr, len) {
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return this._slice(tr, len, [], sliceArrayContent, concatArrayContent)
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}
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/**
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* @param {Transaction} tr
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* @param {function(any, number, any):void} f
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*/
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forEach (tr, f) {
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for (const val of this.values(tr)) {
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f(val, this.index, this.type)
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}
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}
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/**
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* @template T
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* @param {Transaction} tr
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* @param {function(any, number, any):T} f
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* @return {Array<T>}
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*/
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map (tr, f) {
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const arr = new Array(this.type._length - this.index)
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let i = 0
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for (const val of this.values(tr)) {
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arr[i++] = f(val, this.index, this.type)
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}
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return arr
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}
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/**
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* @param {Transaction} tr
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*/
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values (tr) {
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return {
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[Symbol.iterator] () {
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return this
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},
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next: () => {
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if (this.reachedEnd || this.index === this.type._length) {
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return { done: true }
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}
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const [value] = this.slice(tr, 1)
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return {
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done: false,
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value: value
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}
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}
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}
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}
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}
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/**
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* @param {AbstractContent} itemcontent
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* @param {number} start
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* @param {number} len
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*/
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const sliceArrayContent = (itemcontent, start, len) => {
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const content = itemcontent.getContent()
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return content.length <= len && start === 0 ? content : content.slice(start, start + len)
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}
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/**
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* @param {Array<any>} content
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* @param {Array<any>} added
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*/
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const concatArrayContent = (content, added) => {
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content.push(...added)
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return content
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}
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