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import { Expr } from "./parser";
import { match, matchString } from "./utils/adt";
export type Dependencies = {
addClass(id: string, classes: string): Promise<void>
removeClass(id: string, classes: string): Promise<void>
delay(num: number): Promise<void>
jsEval(js: string): Promise<any>
// requestGetCss(url: string): Promise<string>
// getVarable(name: string, def?: string): Promise<string>
// updateVariable(id: string, varName: string, value: string): Promise<void>
// calculate ??
}
export const evalExpr = async (expr: Expr, deps: Dependencies): Promise<string | undefined> =>
match<Promise<string | undefined>, Expr>(expr, {
Call: async ({ name, args }) => {
await matchString(name, {
'add-class': async () => {
const id = await evalExpr(args[0], deps)
const classes = await evalExpr(args[1], deps)
if (id && classes) {
await deps.addClass(id, classes)
}
},
'remove-class': async () => {
const id = await evalExpr(args[0], deps)
const classes = await evalExpr(args[1], deps)
if (id && classes) {
await deps.removeClass(id, classes)
}
},
'delay': async () => {
const num = await evalExpr(args[0], deps)
num && await deps.delay(parseInt(num, 10))
},
'js-eval': async () => {
const js = await evalExpr(args[0], deps)
js && await deps.jsEval(js)
},
_: () => Promise.reject(new Error('not supposed to be here')),
})
return undefined
},
LiteralString: async s => s,
Identifier: async s => s,
VarIdentifier: async s => s,
_: async _ => undefined,
})
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