| 1 | import { KEYS, nanoid, NodeApi, type TElement } from "platejs"; |
| 2 | import { type PlateEditor } from "platejs/react"; |
| 3 | |
| 4 | export type PaletteDropSource = |
| 5 | | "basicBlocks" |
| 6 | | "charts" |
| 7 | | "diagrams" |
| 8 | | "elements"; |
| 9 | |
| 10 | export type PaletteDropTarget = { |
| 11 | editorId: string; |
| 12 | elementId: string; |
| 13 | itemKey?: string; |
| 14 | source: PaletteDropSource; |
| 15 | targetKind?: "element" | "rootImage"; |
| 16 | mutableSignature?: string; |
| 17 | }; |
| 18 | |
| 19 | export const PALETTE_DROP_MUTABLE_KEY = "paletteDropMutable"; |
| 20 | const EMPTY_PLACEHOLDER_BLOCK_TYPES = new Set([ |
| 21 | KEYS.p, |
| 22 | "h1", |
| 23 | "h2", |
| 24 | "h3", |
| 25 | "h4", |
| 26 | "h5", |
| 27 | "h6", |
| 28 | ]); |
| 29 | |
| 30 | type PaletteDragItem = { |
| 31 | element?: unknown; |
| 32 | itemKey?: unknown; |
| 33 | sourcePanel?: PaletteDropSource; |
| 34 | }; |
| 35 | |
| 36 | function isElementNode(node: unknown): node is TElement { |
| 37 | return ( |
| 38 | typeof node === "object" && |
| 39 | node !== null && |
| 40 | "type" in node && |
| 41 | "children" in node |
| 42 | ); |
| 43 | } |
| 44 | |
| 45 | function cloneTextLikeNode(node: unknown): unknown { |
| 46 | if (typeof node !== "object" || node === null) { |
| 47 | return node; |
| 48 | } |
| 49 | |
| 50 | if (Array.isArray(node)) { |
| 51 | return node.map((child) => |
| 52 | isElementNode(child) |
| 53 | ? cloneElementWithFreshIds(child) |
| 54 | : cloneTextLikeNode(child), |
| 55 | ); |
| 56 | } |
| 57 | |
| 58 | return { ...(node as Record<string, unknown>) }; |
| 59 | } |
| 60 | |
| 61 | function cloneElementWithFreshIds( |
| 62 | element: TElement, |
| 63 | preservedRootId?: string, |
| 64 | ): TElement { |
| 65 | const elementRecord = element as TElement & Record<string, unknown>; |
| 66 | const children = Array.isArray(elementRecord.children) |
| 67 | ? elementRecord.children.map((child) => |
| 68 | isElementNode(child) |
| 69 | ? cloneElementWithFreshIds(child) |
| 70 | : cloneTextLikeNode(child), |
| 71 | ) |
| 72 | : []; |
| 73 | |
| 74 | return { |
| 75 | ...elementRecord, |
| 76 | id: preservedRootId ?? nanoid(), |
| 77 | [PALETTE_DROP_MUTABLE_KEY]: true, |
| 78 | children, |
| 79 | } as TElement; |
| 80 | } |
| 81 | |
| 82 | export function isPaletteDropMutable(target: unknown): boolean { |
| 83 | return ( |
| 84 | typeof target === "object" && |
| 85 | target !== null && |
| 86 | (target as Record<string, unknown>)[PALETTE_DROP_MUTABLE_KEY] === true |
| 87 | ); |
| 88 | } |
| 89 | |
| 90 | function normalizeForPaletteSignature(value: unknown): unknown { |
| 91 | if (Array.isArray(value)) { |
| 92 | return value.map(normalizeForPaletteSignature); |
| 93 | } |
| 94 | |
| 95 | if (typeof value !== "object" || value === null) { |
| 96 | return value; |
| 97 | } |
| 98 | |
| 99 | const valueRecord = value as Record<string, unknown>; |
| 100 | const normalizedEntries = Object.keys(valueRecord) |
| 101 | .filter( |
| 102 | (key) => |
| 103 | key !== "id" && |
| 104 | key !== "lastUpdate" && |
| 105 | key !== PALETTE_DROP_MUTABLE_KEY, |
| 106 | ) |
| 107 | .sort() |
| 108 | .map((key) => [key, normalizeForPaletteSignature(valueRecord[key])]); |
| 109 | |
| 110 | return Object.fromEntries(normalizedEntries); |
| 111 | } |
| 112 | |
| 113 | export function getPaletteMutableSignature(value: unknown): string { |
| 114 | return JSON.stringify(normalizeForPaletteSignature(value)); |
| 115 | } |
| 116 | |
| 117 | export function clonePaletteDropElements(element: unknown): TElement[] { |
| 118 | if (Array.isArray(element)) { |
| 119 | return element |
| 120 | .filter(isElementNode) |
| 121 | .map((node) => cloneElementWithFreshIds(node)); |
| 122 | } |
| 123 | |
| 124 | return isElementNode(element) ? [cloneElementWithFreshIds(element)] : []; |
| 125 | } |
| 126 | |
| 127 | export function getPaletteDragSource( |
| 128 | dragItem: unknown, |
| 129 | ): PaletteDropSource | null { |
| 130 | const sourcePanel = (dragItem as PaletteDragItem | undefined)?.sourcePanel; |
| 131 | |
| 132 | return sourcePanel === "basicBlocks" || |
| 133 | sourcePanel === "elements" || |
| 134 | sourcePanel === "charts" || |
| 135 | sourcePanel === "diagrams" |
| 136 | ? sourcePanel |
| 137 | : null; |
| 138 | } |
| 139 | |
| 140 | export function getPaletteDragItemKey(dragItem: unknown): string | undefined { |
| 141 | const itemKey = (dragItem as PaletteDragItem | undefined)?.itemKey; |
| 142 | |
| 143 | return typeof itemKey === "string" ? itemKey : undefined; |
| 144 | } |
| 145 | |
| 146 | export function getElementId(element: TElement | undefined): string | null { |
| 147 | const id = (element as { id?: unknown } | undefined)?.id; |
| 148 | |
| 149 | return typeof id === "string" ? id : null; |
| 150 | } |
| 151 | |
| 152 | function isEmptyPlaceholderBlock(node: unknown): node is TElement { |
| 153 | return ( |
| 154 | isElementNode(node) && |
| 155 | EMPTY_PLACEHOLDER_BLOCK_TYPES.has(node.type) && |
| 156 | NodeApi.string(node).trim().length === 0 |
| 157 | ); |
| 158 | } |
| 159 | |
| 160 | function getEmptyPlaceholderFallback( |
| 161 | editor: PlateEditor, |
| 162 | ): [TElement, number[]] | null { |
| 163 | if (!editor.api.isEmpty()) return null; |
| 164 | |
| 165 | const firstBlock = editor.children[0]; |
| 166 | |
| 167 | return isEmptyPlaceholderBlock(firstBlock) ? [firstBlock, [0]] : null; |
| 168 | } |
| 169 | |
| 170 | export function replaceElementById( |
| 171 | editor: PlateEditor, |
| 172 | elementId: string, |
| 173 | nextElement: TElement, |
| 174 | expectedMutableSignature?: string, |
| 175 | ): boolean { |
| 176 | const entry = editor.api.node({ id: elementId, at: [] }); |
| 177 | |
| 178 | if (!entry) return false; |
| 179 | |
| 180 | const [currentElement, path] = entry; |
| 181 | |
| 182 | if (!isPaletteDropMutable(currentElement)) return false; |
| 183 | if ( |
| 184 | expectedMutableSignature && |
| 185 | getPaletteMutableSignature(currentElement) !== expectedMutableSignature |
| 186 | ) { |
| 187 | return false; |
| 188 | } |
| 189 | |
| 190 | const replacement = cloneElementWithFreshIds(nextElement, elementId); |
| 191 | |
| 192 | editor.tf.withoutNormalizing(() => { |
| 193 | editor.tf.removeNodes({ at: path }); |
| 194 | editor.tf.insertNodes(replacement, { at: path }); |
| 195 | }); |
| 196 | |
| 197 | return true; |
| 198 | } |
| 199 | |
| 200 | export function replaceFocusedEmptyParagraph( |
| 201 | editor: PlateEditor, |
| 202 | nextElement: TElement, |
| 203 | ): TElement | null { |
| 204 | const focus = editor.selection?.focus; |
| 205 | const blockEntry = focus ? editor.api.block({ at: focus }) : null; |
| 206 | const targetEntry = |
| 207 | blockEntry && isEmptyPlaceholderBlock(blockEntry[0]) |
| 208 | ? blockEntry |
| 209 | : getEmptyPlaceholderFallback(editor); |
| 210 | |
| 211 | if (!targetEntry) return null; |
| 212 | |
| 213 | const [, blockPath] = targetEntry; |
| 214 | |
| 215 | const replacement = cloneElementWithFreshIds(nextElement); |
| 216 | |
| 217 | editor.tf.withoutNormalizing(() => { |
| 218 | editor.tf.removeNodes({ at: blockPath }); |
| 219 | editor.tf.insertNodes(replacement, { at: blockPath }); |
| 220 | }); |
| 221 | |
| 222 | return replacement; |
| 223 | } |
| 224 |