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import {type EditorView, type EditorProps} from "prosemirror-view" import {EditorState, EditorStateConfig} from "./state" import {Transaction} from "./transaction" /// This is the type passed to the [`Plugin`](#state.Plugin) /// constructor. It provides a definition for a plugin. export interface PluginSpec<PluginState> { /// The [view props](#view.EditorProps) added by this plugin. Props /// that are functions will be bound to have the plugin instance as /// their `this` binding. props?: EditorProps<Plugin<PluginState>> /// Allows a plugin to define a [state field](#state.StateField), an /// extra slot in the state object in which it can keep its own data. state?: StateField<PluginState> /// Can be used to make this a keyed plugin. You can have only one /// plugin with a given key in a given state, but it is possible to /// access the plugin's configuration and state through the key, /// without having access to the plugin instance object. key?: PluginKey /// When the plugin needs to interact with the editor view, or /// set something up in the DOM, use this field. The function /// will be called when the plugin's state is associated with an /// editor view. view?: (view: EditorView) => PluginView /// When present, this will be called before a transaction is /// applied by the state, allowing the plugin to cancel it (by /// returning false). filterTransaction?: (tr: Transaction, state: EditorState) => boolean /// Allows the plugin to append another transaction to be applied /// after the given array of transactions. When another plugin /// appends a transaction after this was called, it is called again /// with the new state and new transactions—but only the new /// transactions, i.e. it won't be passed transactions that it /// already saw. appendTransaction?: (transactions: readonly Transaction[], oldState: EditorState, newState: EditorState) => Transaction | null | undefined /// Additional properties are allowed on plugin specs, which can be /// read via [`Plugin.spec`](#state.Plugin.spec). [key: string]: any } /// A stateful object that can be installed in an editor by a /// [plugin](#state.PluginSpec.view). export type PluginView = { /// Called whenever the view's state is updated. update?: (view: EditorView, prevState: EditorState) => void /// Called when the view is destroyed or receives a state /// with different plugins. destroy?: () => void } function bindProps(obj: {[prop: string]: any}, self: any, target: {[prop: string]: any}) { for (let prop in obj) { let val = obj[prop] if (val instanceof Function) val = val.bind(self) else if (prop == "handleDOMEvents") val = bindProps(val, self, {}) target[prop] = val } return target } /// Plugins bundle functionality that can be added to an editor. /// They are part of the [editor state](#state.EditorState) and /// may influence that state and the view that contains it. export class Plugin<PluginState = any> { /// Create a plugin. constructor( /// The plugin's [spec object](#state.PluginSpec). readonly spec: PluginSpec<PluginState> ) { if (spec.props) bindProps(spec.props, this, this.props) this.key = spec.key ? spec.key.key : createKey("plugin") } /// The [props](#view.EditorProps) exported by this plugin. readonly props: EditorProps<Plugin<PluginState>> = {} /// @internal key: string /// Extract the plugin's state field from an editor state. getState(state: EditorState): PluginState | undefined { return (state as any)[this.key] } } /// A plugin spec may provide a state field (under its /// [`state`](#state.PluginSpec.state) property) of this type, which /// describes the state it wants to keep. Functions provided here are /// always called with the plugin instance as their `this` binding. export interface StateField<T> { /// Initialize the value of the field. `config` will be the object /// passed to [`EditorState.create`](#state.EditorState^create). Note /// that `instance` is a half-initialized state instance, and will /// not have values for plugin fields initialized after this one. init: (config: EditorStateConfig, instance: EditorState) => T /// Apply the given transaction to this state field, producing a new /// field value. Note that the `newState` argument is again a partially /// constructed state does not yet contain the state from plugins /// coming after this one. apply: (tr: Transaction, value: T, oldState: EditorState, newState: EditorState) => T /// Convert this field to JSON. Optional, can be left off to disable /// JSON serialization for the field. toJSON?: (value: T) => any /// Deserialize the JSON representation of this field. Note that the /// `state` argument is again a half-initialized state. fromJSON?: (config: EditorStateConfig, value: any, state: EditorState) => T } const keys = Object.create(null) function createKey(name: string) { if (name in keys) return name + "$" + ++keys[name] keys[name] = 0 return name + "$" } /// A key is used to [tag](#state.PluginSpec.key) plugins in a way /// that makes it possible to find them, given an editor state. /// Assigning a key does mean only one plugin of that type can be /// active in a state. export class PluginKey<PluginState = any> { /// @internal key: string /// Create a plugin key. constructor(name = "key") { this.key = createKey(name) } /// Get the active plugin with this key, if any, from an editor /// state. get(state: EditorState): Plugin<PluginState> | undefined { return state.config.pluginsByKey[this.key] } /// Get the plugin's state from an editor state. getState(state: EditorState): PluginState | undefined { return (state as any)[this.key] } }
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