4.1: editor-normal and the node accessors

src/adf/editor-normal.ts

@@ -1,6 +1,12 @@
-import type { AdfMark, AdfNode } from './document.ts'
+import type { AdfAttributes, AdfDocument, AdfMark, AdfNode } from './document.ts'
+import type { JsonValue } from '../json-value.ts'
+import { nodeAttrs, nodeContent, nodeMarks } from './document.ts'
 import { serializeCanonicalJson } from '../canonical-json.ts'
 
+type JsonContainer = JsonValue[] | { [key: string]: JsonValue }
+
+type NodeHolder = { content?: AdfNode[] }
+
 export function sameMark(candidate: AdfMark, mark: AdfMark): boolean {
   return markKey(candidate) === markKey(mark)
 }
@@ -19,12 +25,61 @@ export function mergeAdjacentText(nodes: readonly AdfNode[]): AdfNode[] {
   return merged
 }
 
+export function toEditorNormal(document: AdfDocument): AdfDocument {
+  const normal: AdfDocument = { type: document.type, version: Object.is(document.version, -0) ? 0 : document.version }
+  const pending: { holder: NodeHolder; source: NodeHolder }[] = [{ holder: normal, source: document }]
+  for (let entry = pending.pop(); entry !== undefined; entry = pending.pop()) {
+    const content = mergeAdjacentText(nodeContent(entry.source))
+    if (content.length === 0) continue
+    entry.holder.content = content.map((source) => {
+      const holder = normalNode(source)
+      pending.push({ holder, source })
+      return holder
+    })
+  }
+  return normal
+}
+
+function normalNode(node: AdfNode): AdfNode {
+  const normal: AdfNode = { type: node.type }
+  const attrs = normalAttributes(nodeAttrs(node))
+  if (attrs !== undefined) normal.attrs = attrs
+  const marks = nodeMarks(node).map(normalMark)
+  if (marks.length > 0) normal.marks = marks
+  if (node.text !== undefined) normal.text = node.text
+  return normal
+}
+
+function normalMark(mark: AdfMark): AdfMark {
+  const attrs = normalAttributes(nodeAttrs(mark))
+  return attrs === undefined ? { type: mark.type } : { attrs, type: mark.type }
+}
+
+function normalAttributes(attrs: AdfAttributes): AdfAttributes | undefined {
+  if (Object.keys(attrs).length === 0) return undefined
+  const normal = { ...attrs }
+  const pending: JsonContainer[] = [normal]
+  for (let held = pending.pop(); held !== undefined; held = pending.pop()) {
+    if (Array.isArray(held)) for (const [index, value] of held.entries()) held[index] = normalValue(value, pending)
+    else for (const [key, value] of Object.entries(held)) held[key] = normalValue(value, pending)
+  }
+  return normal
+}
+
+function normalValue(value: JsonValue, pending: JsonContainer[]): JsonValue {
+  if (Object.is(value, -0)) return 0
+  if (value === null || typeof value !== 'object') return value
+  const copy = Array.isArray(value) ? [...value] : { ...value }
+  pending.push(copy)
+  return copy
+}
+
 function mergesText(node: AdfNode): boolean {
-  return node.type === 'text' && Object.keys(node.attrs ?? {}).length === 0
+  return node.type === 'text' && Object.keys(nodeAttrs(node)).length === 0
 }
 
 function sameMarks(previous: AdfNode, node: AdfNode): boolean {
-  return marksKey(previous.marks ?? []) === marksKey(node.marks ?? [])
+  return marksKey(nodeMarks(previous)) === marksKey(nodeMarks(node))
 }
 
 function marksKey(marks: readonly AdfMark[]): string {
@@ -32,5 +87,5 @@ function marksKey(marks: readonly AdfMark[]): string {
 }
 
 function markKey(mark: AdfMark): string {
-  return `${mark.type} ${serializeCanonicalJson(mark.attrs ?? {}, 'compact')}`
+  return `${mark.type} ${serializeCanonicalJson(nodeAttrs(mark), 'compact')}`
 }