tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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attr_step.ts (2674B)

      1 import {Fragment, Slice, Node, Schema} from "prosemirror-model"
      2 import {Step, StepResult} from "./step"
      3 import {StepMap, Mappable} from "./map"
      4 
      5 /// Update an attribute in a specific node.
      6 export class AttrStep extends Step {
      7  /// Construct an attribute step.
      8  constructor(
      9    /// The position of the target node.
     10    readonly pos: number,
     11    /// The attribute to set.
     12    readonly attr: string,
     13    // The attribute's new value.
     14    readonly value: any
     15  ) {
     16    super()
     17  }
     18 
     19  apply(doc: Node) {
     20    let node = doc.nodeAt(this.pos)
     21    if (!node) return StepResult.fail("No node at attribute step's position")
     22    let attrs = Object.create(null)
     23    for (let name in node.attrs) attrs[name] = node.attrs[name]
     24    attrs[this.attr] = this.value
     25    let updated = node.type.create(attrs, null, node.marks)
     26    return StepResult.fromReplace(doc, this.pos, this.pos + 1, new Slice(Fragment.from(updated), 0, node.isLeaf ? 0 : 1))
     27  }
     28 
     29  getMap() {
     30    return StepMap.empty
     31  }
     32 
     33  invert(doc: Node) {
     34    return new AttrStep(this.pos, this.attr, doc.nodeAt(this.pos)!.attrs[this.attr])
     35  }
     36 
     37  map(mapping: Mappable) {
     38    let pos = mapping.mapResult(this.pos, 1)
     39    return pos.deletedAfter ? null : new AttrStep(pos.pos, this.attr, this.value)
     40  }
     41 
     42  toJSON(): any {
     43    return {stepType: "attr", pos: this.pos, attr: this.attr, value: this.value}
     44  }
     45 
     46  static fromJSON(schema: Schema, json: any) {
     47    if (typeof json.pos != "number" || typeof json.attr != "string")
     48      throw new RangeError("Invalid input for AttrStep.fromJSON")
     49    return new AttrStep(json.pos, json.attr, json.value)
     50  }
     51 }
     52 
     53 Step.jsonID("attr", AttrStep)
     54 
     55 /// Update an attribute in the doc node.
     56 export class DocAttrStep extends Step {
     57  /// Construct an attribute step.
     58  constructor(
     59    /// The attribute to set.
     60    readonly attr: string,
     61    // The attribute's new value.
     62    readonly value: any
     63  ) {
     64    super()
     65  }
     66 
     67  apply(doc: Node) {
     68    let attrs = Object.create(null)
     69    for (let name in doc.attrs) attrs[name] = doc.attrs[name]
     70    attrs[this.attr] = this.value
     71    let updated = doc.type.create(attrs, doc.content, doc.marks)
     72    return StepResult.ok(updated)
     73  }
     74 
     75  getMap() {
     76    return StepMap.empty
     77  }
     78 
     79  invert(doc: Node) {
     80    return new DocAttrStep(this.attr, doc.attrs[this.attr])
     81  }
     82 
     83  map(mapping: Mappable) {
     84    return this
     85  }
     86 
     87  toJSON(): any {
     88    return {stepType: "docAttr", attr: this.attr, value: this.value}
     89  }
     90 
     91  static fromJSON(schema: Schema, json: any) {
     92    if (typeof json.attr != "string")
     93      throw new RangeError("Invalid input for DocAttrStep.fromJSON")
     94    return new DocAttrStep(json.attr, json.value)
     95  }
     96 }
     97 
     98 Step.jsonID("docAttr", DocAttrStep)