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import { Expr } from "./parser";
import { match, matchString } from "./utils/adt";
export type EvalActions = {
addClass(id: string, classes: string): Promise<void>
removeClass(id: string, classes: string): Promise<void>
delay(num: number): Promise<void>
jsEval(js: string): Promise<any>
loadCssx(id: string, url: string): Promise<string>
getVariable(name: string): Promise<string | undefined>
updateVariable(id: string, varName: string, value: string): Promise<void>
// calculate ??
}
type EvalValue = string | undefined | void
export const evalExpr = async (expr: Expr, actions: EvalActions): Promise<EvalValue> =>
match<Promise<EvalValue>, Expr>(expr, {
Call: async ({ name, args }) => {
return matchString<Promise<EvalValue>, string>(name, {
'add-class': async () => {
const id = await evalExpr(args[0], actions)
const classes = await evalExpr(args[1], actions)
if (id && classes) {
await actions.addClass(id, classes)
}
},
'remove-class': async () => {
const id = await evalExpr(args[0], actions)
const classes = await evalExpr(args[1], actions)
if (id && classes) {
await actions.removeClass(id, classes)
}
},
'delay': async () => {
const num = await evalExpr(args[0], actions)
num && await actions.delay(parseInt(num, 10))
},
'js-eval': async () => {
const js = await evalExpr(args[0], actions)
js && await actions.jsEval(js)
},
'load-cssx': async () => {
const id = await evalExpr(args[0], actions)
const url = await evalExpr(args[1], actions)
if (id && url) {
await actions.loadCssx(id, url)
}
},
'var': async () => {
const varName = await evalExpr(args[0], actions)
const defaultValue = await evalExpr(args[1], actions)
return varName && (actions.getVariable(varName) ?? defaultValue)
},
'update': async () => {
const id = await evalExpr(args[0], actions)
const varName = await evalExpr(args[1], actions)
const value = await evalExpr(args[2], actions)
if (id && varName && value) {
actions.updateVariable(id, varName, value)
}
},
_: () => Promise.reject(new Error('not supposed to be here')),
})
},
LiteralString: async s => s,
Identifier: async s => s,
VarIdentifier: async s => s,
_: async _ => undefined,
})
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