{"version":3,"file":"cursor.js","names":["EmbedBlot","Scope","TextBlot","Cursor","blotName","className","tagName","CONTENTS","value","undefined","constructor","scroll","domNode","selection","textNode","document","createTextNode","appendChild","savedLength","detach","parent","removeChild","format","name","target","index","statics","scope","BLOCK_BLOT","offset","length","optimize","formatAt","node","position","data","remove","restore","composing","range","getNativeRange","lastChild","parentNode","insertBefore","prevTextBlot","prev","prevTextLength","nextTextBlot","next","nextText","text","newText","split","join","mergedTextBlot","insertAt","newTextNode","create","remapOffset","start","end","startNode","startOffset","endNode","endOffset","update","mutations","context","some","mutation","type","isolate","unwrap"],"sources":["../../src/blots/cursor.ts"],"sourcesContent":["import { EmbedBlot, Scope } from 'parchment';\nimport type { Parent, ScrollBlot } from 'parchment';\nimport type Selection from '../core/selection.js';\nimport TextBlot from './text.js';\nimport type { EmbedContextRange } from './embed.js';\n\nclass Cursor extends EmbedBlot {\n  static blotName = 'cursor';\n  static className = 'ql-cursor';\n  static tagName = 'span';\n  static CONTENTS = '\\uFEFF'; // Zero width no break space\n\n  static value() {\n    return undefined;\n  }\n\n  selection: Selection;\n  textNode: Text;\n  savedLength: number;\n\n  constructor(scroll: ScrollBlot, domNode: HTMLElement, selection: Selection) {\n    super(scroll, domNode);\n    this.selection = selection;\n    this.textNode = document.createTextNode(Cursor.CONTENTS);\n    this.domNode.appendChild(this.textNode);\n    this.savedLength = 0;\n  }\n\n  detach() {\n    // super.detach() will also clear domNode.__blot\n    if (this.parent != null) this.parent.removeChild(this);\n  }\n\n  format(name: string, value: unknown) {\n    if (this.savedLength !== 0) {\n      super.format(name, value);\n      return;\n    }\n    // TODO: Fix this next time the file is edited.\n    // eslint-disable-next-line @typescript-eslint/no-this-alias\n    let target: Parent | this = this;\n    let index = 0;\n    while (target != null && target.statics.scope !== Scope.BLOCK_BLOT) {\n      index += target.offset(target.parent);\n      target = target.parent;\n    }\n    if (target != null) {\n      this.savedLength = Cursor.CONTENTS.length;\n      // @ts-expect-error TODO: allow empty context in Parchment\n      target.optimize();\n      target.formatAt(index, Cursor.CONTENTS.length, name, value);\n      this.savedLength = 0;\n    }\n  }\n\n  index(node: Node, offset: number) {\n    if (node === this.textNode) return 0;\n    return super.index(node, offset);\n  }\n\n  length() {\n    return this.savedLength;\n  }\n\n  position(): [Text, number] {\n    return [this.textNode, this.textNode.data.length];\n  }\n\n  remove() {\n    super.remove();\n    // @ts-expect-error Fix me later\n    this.parent = null;\n  }\n\n  restore(): EmbedContextRange | null {\n    if (this.selection.composing || this.parent == null) return null;\n    const range = this.selection.getNativeRange();\n    // Browser may push down styles/nodes inside the cursor blot.\n    // https://dvcs.w3.org/hg/editing/raw-file/tip/editing.html#push-down-values\n    while (\n      this.domNode.lastChild != null &&\n      this.domNode.lastChild !== this.textNode\n    ) {\n      // @ts-expect-error Fix me later\n      this.domNode.parentNode.insertBefore(\n        this.domNode.lastChild,\n        this.domNode,\n      );\n    }\n\n    const prevTextBlot = this.prev instanceof TextBlot ? this.prev : null;\n    const prevTextLength = prevTextBlot ? prevTextBlot.length() : 0;\n    const nextTextBlot = this.next instanceof TextBlot ? this.next : null;\n    // @ts-expect-error TODO: make TextBlot.text public\n    const nextText = nextTextBlot ? nextTextBlot.text : '';\n    const { textNode } = this;\n    // take text from inside this blot and reset it\n    const newText = textNode.data.split(Cursor.CONTENTS).join('');\n    textNode.data = Cursor.CONTENTS;\n\n    // proactively merge TextBlots around cursor so that optimization\n    // doesn't lose the cursor.  the reason we are here in cursor.restore\n    // could be that the user clicked in prevTextBlot or nextTextBlot, or\n    // the user typed something.\n    let mergedTextBlot;\n    if (prevTextBlot) {\n      mergedTextBlot = prevTextBlot;\n      if (newText || nextTextBlot) {\n        prevTextBlot.insertAt(prevTextBlot.length(), newText + nextText);\n        if (nextTextBlot) {\n          nextTextBlot.remove();\n        }\n      }\n    } else if (nextTextBlot) {\n      mergedTextBlot = nextTextBlot;\n      nextTextBlot.insertAt(0, newText);\n    } else {\n      const newTextNode = document.createTextNode(newText);\n      mergedTextBlot = this.scroll.create(newTextNode);\n      this.parent.insertBefore(mergedTextBlot, this);\n    }\n\n    this.remove();\n    if (range) {\n      // calculate selection to restore\n      const remapOffset = (node: Node, offset: number) => {\n        if (prevTextBlot && node === prevTextBlot.domNode) {\n          return offset;\n        }\n        if (node === textNode) {\n          return prevTextLength + offset - 1;\n        }\n        if (nextTextBlot && node === nextTextBlot.domNode) {\n          return prevTextLength + newText.length + offset;\n        }\n        return null;\n      };\n\n      const start = remapOffset(range.start.node, range.start.offset);\n      const end = remapOffset(range.end.node, range.end.offset);\n      if (start !== null && end !== null) {\n        return {\n          startNode: mergedTextBlot.domNode,\n          startOffset: start,\n          endNode: mergedTextBlot.domNode,\n          endOffset: end,\n        };\n      }\n    }\n    return null;\n  }\n\n  update(mutations: MutationRecord[], context: Record<string, unknown>) {\n    if (\n      mutations.some((mutation) => {\n        return (\n          mutation.type === 'characterData' && mutation.target === this.textNode\n        );\n      })\n    ) {\n      const range = this.restore();\n      if (range) context.range = range;\n    }\n  }\n\n  // Avoid .ql-cursor being a descendant of `<a/>`.\n  // The reason is Safari pushes down `<a/>` on text insertion.\n  // That will cause DOM nodes not sync with the model.\n  //\n  // For example ({I} is the caret), given the markup:\n  //    <a><span class=\"ql-cursor\">\\uFEFF{I}</span></a>\n  // When typing a char \"x\", `<a/>` will be pushed down inside the `<span>` first:\n  //    <span class=\"ql-cursor\"><a>\\uFEFF{I}</a></span>\n  // And then \"x\" will be inserted after `<a/>`:\n  //    <span class=\"ql-cursor\"><a>\\uFEFF</a>d{I}</span>\n  optimize(context?: unknown) {\n    // @ts-expect-error Fix me later\n    super.optimize(context);\n\n    let { parent } = this;\n    while (parent) {\n      if (parent.domNode.tagName === 'A') {\n        this.savedLength = Cursor.CONTENTS.length;\n        // @ts-expect-error TODO: make isolate generic\n        parent.isolate(this.offset(parent), this.length()).unwrap();\n        this.savedLength = 0;\n        break;\n      }\n      parent = parent.parent;\n    }\n  }\n\n  value() {\n    return '';\n  }\n}\n\nexport default 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