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import { Type } from 'ts-morph'
import { promises as fs } from 'fs'
import readline from 'readline'
import { match } from './util'
import { Ctx } from './types'
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout,
terminal: false,
})
const readLineFromStdin = (): Promise<string> =>
new Promise((res) => rl.on('line', res))
export const evaluateType = async (
ctx: Ctx,
effTyp: Type
): Promise<string[]> => {
const name = effTyp.getSymbol()?.getName()
return match(name, {
DefineEffect: async () => {
const [nameTyp, exprTyp] = effTyp.getTypeArguments()
const name = nameTyp?.getLiteralValue() as string
const exprStr = exprTyp?.getLiteralValue() as string
ctx.addCustomEffect(name, exprStr)
return []
},
Print: async () => {
console.log(...effTyp.getTypeArguments().map(ctx.typeToString))
return []
},
PutString: async () => {
const [strinTyp] = effTyp.getTypeArguments()
const typString = ctx.typeToString(strinTyp)
const string = JSON.parse(
!typString.startsWith('"') ? `"${typString}"` : typString
)
process.stdout.write(string)
return []
},
Debug: async () => {
const [labelTyp, valueTyp] = effTyp.getTypeArguments()
const label = JSON.parse(ctx.typeToString(labelTyp))
const value = ctx.typeToString(valueTyp)
console.log(label, value)
const [resultKey, _] = ctx.createResult(JSON.stringify(value))
return [resultKey]
},
ReadFile: async () => {
const [pathTyp] = effTyp.getTypeArguments()
const filePath = JSON.parse(ctx.typeToString(pathTyp))
const contents = await fs.readFile(filePath, 'utf-8')
const [resultKey, _] = ctx.createResult(JSON.stringify(contents))
return [resultKey]
},
WriteFile: async () => {
const [pathTyp, contentsTyp] = effTyp.getTypeArguments()
const filePath = JSON.parse(ctx.typeToString(pathTyp))
const contents = JSON.parse(ctx.typeToString(contentsTyp))
await fs.writeFile(filePath, contents)
return []
},
Bind: async () => {
const [inputTyp, chainToKind] = effTyp.getTypeArguments()
const [resultKey] = inputTyp ? await evaluateType(ctx, inputTyp) : []
const [_, compNode] = ctx.createResult(
`(${ctx.typeToString(chainToKind)} & { input: (${ctx.getResultExpr(
resultKey
)})['output'] })['return']`
)
// TODO: Avoid using getTypeAtLocation?
const compTyp = compNode
?.getType()
.getProperty('output')
?.getTypeAtLocation(ctx.entryPoint)
return compTyp ? await evaluateType(ctx, compTyp) : []
},
GetEnv: async () => {
const [envTyp] = effTyp.getTypeArguments()
const envName = JSON.parse(ctx.typeToString(envTyp))
const [resultKey, _] = ctx.createResult(
`${JSON.stringify(process.env[envName] ?? '')}`
)
return [resultKey]
},
GetArgs: async () => {
const [resultKey, _] = ctx.createResult(
`${JSON.stringify(process.argv.slice(2))}`
)
return [resultKey]
},
ReadLine: async () => {
const line = await readLineFromStdin()
const [resultKey, _] = ctx.createResult(`${JSON.stringify(line)}`)
return [resultKey]
},
JsExpr: async () => {
const [exprTyp] = effTyp.getTypeArguments()
const exprStr = JSON.parse(ctx.typeToString(exprTyp))
const result = eval(`JSON.stringify(${exprStr})`)
const [resultKey, _] = ctx.createResult(`${result}`)
return [resultKey]
},
Seq: async () => {
const [effectTyps] = effTyp.getTypeArguments()
const effectResults = await evalList(
ctx,
effectTyps?.getTupleElements() ?? []
)
const [resultKey, _] = ctx.createResult(`[
${effectResults.map(ctx.getResultExpr).join(', ')}
]`)
return [resultKey]
},
Do: async () => {
const [effectTyps] = effTyp.getTypeArguments()
const effectResults = await evalList(
ctx,
effectTyps?.getTupleElements() ?? []
)
const lastResKey = effectResults[effectResults.length - 1]
const [resultKey, _] = ctx.createResult(
`${ctx.getResultExpr(lastResKey)}['output']`
)
return [resultKey]
},
_: async () => {
if (name && ctx.hasCustomEffect(name)) {
return ctx.runCustomEffect(name, effTyp.getTypeArguments())
}
console.log(`${name} result effect is unhandled`)
return []
},
})
}
export const evalList = async (ctx: Ctx, effectTyps: Type[]) => {
const effectResults: string[] = []
for (const item of effectTyps ?? []) {
effectResults.push(...(await evaluateType(ctx, item)))
}
return effectResults
}
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