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react-code-dataset / slate /packages /slate-hyperscript /src /tokens.ts
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import { Node, Path, Text } from 'slate'
/**
* A weak map to hold anchor tokens.
*/
const ANCHOR: WeakMap<Node, [number, AnchorToken]> = new WeakMap()
/**
* A weak map to hold focus tokens.
*/
const FOCUS: WeakMap<Node, [number, FocusToken]> = new WeakMap()
/**
* All tokens inherit from a single constructor for `instanceof` checking.
*/
export class Token {}
/**
* Anchor tokens represent the selection's anchor point.
*/
export class AnchorToken extends Token {
offset?: number
path?: Path
constructor(
props: {
offset?: number
path?: Path
} = {}
) {
super()
const { offset, path } = props
this.offset = offset
this.path = path
}
}
/**
* Focus tokens represent the selection's focus point.
*/
export class FocusToken extends Token {
offset?: number
path?: Path
constructor(
props: {
offset?: number
path?: Path
} = {}
) {
super()
const { offset, path } = props
this.offset = offset
this.path = path
}
}
/**
* Add an anchor token to the end of a text node.
*/
export const addAnchorToken = (text: Text, token: AnchorToken) => {
const offset = text.text.length
ANCHOR.set(text, [offset, token])
}
/**
* Get the offset if a text node has an associated anchor token.
*/
export const getAnchorOffset = (
text: Text
): [number, AnchorToken] | undefined => {
return ANCHOR.get(text)
}
/**
* Add a focus token to the end of a text node.
*/
export const addFocusToken = (text: Text, token: FocusToken) => {
const offset = text.text.length
FOCUS.set(text, [offset, token])
}
/**
* Get the offset if a text node has an associated focus token.
*/
export const getFocusOffset = (
text: Text
): [number, FocusToken] | undefined => {
return FOCUS.get(text)
}