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65 lines
1.7 KiB
TypeScript
65 lines
1.7 KiB
TypeScript
import {VNode, VNodeData} from './vnode';
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import {h} from './h';
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export interface ThunkData extends VNodeData {
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fn: () => VNode;
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args: Array<any>;
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}
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export interface Thunk extends VNode {
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data: ThunkData;
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}
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export interface ThunkFn {
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(sel: string, fn: Function, args: Array<any>): Thunk;
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(sel: string, key: any, fn: Function, args: Array<any>): Thunk;
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}
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function copyToThunk(vnode: VNode, thunk: VNode): void {
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thunk.elm = vnode.elm;
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(vnode.data as VNodeData).fn = (thunk.data as VNodeData).fn;
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(vnode.data as VNodeData).args = (thunk.data as VNodeData).args;
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thunk.data = vnode.data;
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thunk.children = vnode.children;
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thunk.text = vnode.text;
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thunk.elm = vnode.elm;
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}
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function init(thunk: VNode): void {
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const cur = thunk.data as VNodeData;
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const vnode = (cur.fn as any).apply(undefined, cur.args);
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copyToThunk(vnode, thunk);
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}
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function prepatch(oldVnode: VNode, thunk: VNode): void {
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let i: number, old = oldVnode.data as VNodeData, cur = thunk.data as VNodeData;
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const oldArgs = old.args, args = cur.args;
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if (old.fn !== cur.fn || (oldArgs as any).length !== (args as any).length) {
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copyToThunk((cur.fn as any).apply(undefined, args), thunk);
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return;
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}
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for (i = 0; i < (args as any).length; ++i) {
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if ((oldArgs as any)[i] !== (args as any)[i]) {
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copyToThunk((cur.fn as any).apply(undefined, args), thunk);
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return;
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}
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}
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copyToThunk(oldVnode, thunk);
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}
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export const thunk = function thunk(sel: string, key?: any, fn?: any, args?: any): VNode {
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if (args === undefined) {
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args = fn;
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fn = key;
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key = undefined;
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}
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return h(sel, {
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key: key,
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hook: {init, prepatch},
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fn: fn,
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args: args
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});
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} as ThunkFn;
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export default thunk;
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