134 lines
3.2 KiB
JavaScript
134 lines
3.2 KiB
JavaScript
/**
|
|
* @module structs
|
|
*/
|
|
import {
|
|
AbstractItem,
|
|
AbstractItemRef,
|
|
computeItemParams,
|
|
splitItem,
|
|
changeItemRefOffset,
|
|
GC,
|
|
Transaction, StructStore, Y, ID, AbstractType // eslint-disable-line
|
|
} from '../internals.js'
|
|
|
|
import * as encoding from 'lib0/encoding.js'
|
|
import * as decoding from 'lib0/decoding.js'
|
|
|
|
export const structStringRefNumber = 6
|
|
|
|
export class ItemString extends AbstractItem {
|
|
/**
|
|
* @param {ID} id
|
|
* @param {AbstractItem | null} left
|
|
* @param {ID | null} origin
|
|
* @param {AbstractItem | null} right
|
|
* @param {ID | null} rightOrigin
|
|
* @param {AbstractType<any>} parent
|
|
* @param {string | null} parentSub
|
|
* @param {string} string
|
|
*/
|
|
constructor (id, left, origin, right, rightOrigin, parent, parentSub, string) {
|
|
super(id, left, origin, right, rightOrigin, parent, parentSub)
|
|
/**
|
|
* @type {string}
|
|
*/
|
|
this.string = string
|
|
}
|
|
/**
|
|
* @param {ID} id
|
|
* @param {AbstractItem | null} left
|
|
* @param {ID | null} origin
|
|
* @param {AbstractItem | null} right
|
|
* @param {ID | null} rightOrigin
|
|
* @param {AbstractType<any>} parent
|
|
* @param {string | null} parentSub
|
|
*/
|
|
copy (id, left, origin, right, rightOrigin, parent, parentSub) {
|
|
return new ItemString(id, left, origin, right, rightOrigin, parent, parentSub, this.string)
|
|
}
|
|
getContent () {
|
|
return this.string.split('')
|
|
}
|
|
get length () {
|
|
return this.string.length
|
|
}
|
|
/**
|
|
* @param {Transaction} transaction
|
|
* @param {number} diff
|
|
* @return {ItemString}
|
|
*/
|
|
splitAt (transaction, diff) {
|
|
/**
|
|
* @type {ItemString}
|
|
*/
|
|
// @ts-ignore
|
|
const right = splitItem(transaction, this, diff)
|
|
right.string = this.string.slice(diff)
|
|
this.string = this.string.slice(0, diff)
|
|
return right
|
|
}
|
|
/**
|
|
* @param {ItemString} right
|
|
* @return {boolean}
|
|
*/
|
|
mergeWith (right) {
|
|
if (super.mergeWith(right)) {
|
|
this.string += right.string
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
/**
|
|
* @param {encoding.Encoder} encoder
|
|
* @param {number} offset
|
|
*/
|
|
write (encoder, offset) {
|
|
super.write(encoder, offset, structStringRefNumber)
|
|
encoding.writeVarString(encoder, offset === 0 ? this.string : this.string.slice(offset))
|
|
}
|
|
}
|
|
|
|
export class ItemStringRef extends AbstractItemRef {
|
|
/**
|
|
* @param {decoding.Decoder} decoder
|
|
* @param {ID} id
|
|
* @param {number} info
|
|
*/
|
|
constructor (decoder, id, info) {
|
|
super(decoder, id, info)
|
|
/**
|
|
* @type {string}
|
|
*/
|
|
this.string = decoding.readVarString(decoder)
|
|
}
|
|
get length () {
|
|
return this.string.length
|
|
}
|
|
/**
|
|
* @param {Transaction} transaction
|
|
* @param {StructStore} store
|
|
* @param {number} offset
|
|
* @return {ItemString|GC}
|
|
*/
|
|
toStruct (transaction, store, offset) {
|
|
if (offset > 0) {
|
|
changeItemRefOffset(this, offset)
|
|
this.string = this.string.slice(offset)
|
|
}
|
|
|
|
const { left, right, parent, parentSub } = computeItemParams(transaction, store, this.left, this.right, this.parent, this.parentSub, this.parentYKey)
|
|
return parent === null
|
|
? new GC(this.id, this.length)
|
|
: new ItemString(
|
|
this.id,
|
|
left,
|
|
this.left,
|
|
right,
|
|
this.right,
|
|
parent,
|
|
parentSub,
|
|
this.string
|
|
)
|
|
}
|
|
}
|