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import { Project, ScriptTarget, Type, Node, StringLiteral, TypeFormatFlags, SyntaxKind } from 'ts-morph'
import path from 'path'
import fs from 'fs'
const project = new Project({
compilerOptions: {
target: ScriptTarget.ES3,
},
})
const typeChecker = project.getTypeChecker()
const sourceFile = project.addSourceFileAtPath(path.resolve("./src/index.ts"))
const entryPoint = sourceFile.getExportedDeclarations().get('main')?.[0]
const typeToString = (ty: Type | undefined): string =>
ty ? typeChecker.compilerObject.typeToString(ty.compilerType) : ''
const getPropertyType = (n: Node, prop: string): Type | undefined => {
const tt = typeChecker.getTypeAtLocation(n)
const propSym = tt.getProperty(prop)
const ty = propSym && typeChecker.getTypeOfSymbolAtLocation(propSym, n)
return ty
}
const typeRefNode = entryPoint?.getLastChild()
const RESULT_TYPE_NAME = '__$result'
const [statement] = sourceFile.addStatements(`type ${RESULT_TYPE_NAME} = {}`)
const addResult = (name: string, ty: string) => {
if (statement.isKind(SyntaxKind.TypeAliasDeclaration)) {
const value = statement.getChildAtIndex(3)
if (value.isKind(SyntaxKind.TypeLiteral)) {
value.addProperty({
name: JSON.stringify(name),
type: `{ output: ${ty} }`,
})
}
}
}
const createHash = () =>
Math.random().toFixed(8).slice(2)
const match = <K extends string, R>(k: K | undefined, pattern: { [key in K | '_']: () => R }) =>
k && pattern[k] ? pattern[k]() : pattern._()
const accumulateResults = (effTyp: Type, node: Node): string[] => {
const name = effTyp.getSymbol()?.getName()
return match(name, {
ReadFile: () => {
const [pathTyp] = effTyp.getTypeArguments()
const filePath = JSON.parse(typeToString(pathTyp))
const contents = fs.readFileSync(filePath, 'utf-8')
const hash = createHash()
addResult(hash, JSON.stringify(contents))
return [hash]
},
ChainIO: () => {
const inputTyp = effTyp.getProperty('input')?.getTypeAtLocation(node)
const inputResults = inputTyp && accumulateResults(inputTyp, node)
return [...(inputResults ?? [])]
},
GetEnv: () => {
const [envTyp] = effTyp.getTypeArguments()
const envName = JSON.parse(typeToString(envTyp))
const hash = createHash()
addResult(hash, `${JSON.stringify(process.env[envName] ?? '')}`)
return [hash]
},
_: () => {
console.log(`${name} result effect is unhandled`)
return []
},
})
}
const evalAccumulator = (effNode: Node, node: Node) => {
const effTyp = effNode.getType()
const name = effTyp.getSymbol()?.getName()
return match(name, {
Print: () => {
console.log(...effTyp.getTypeArguments().map(typeToString));
},
ReadFile: () => {
const [hash] = accumulateResults(effTyp, node)
effNode.replaceWithText(`${RESULT_TYPE_NAME}[${JSON.stringify(hash)}]`)
},
WriteFile: () => {
const [pathTyp, contentsTyp] = effTyp.getTypeArguments()
const filePath = JSON.parse(typeToString(pathTyp))
const contents = JSON.parse(typeToString(contentsTyp))
fs.writeFileSync(filePath, contents)
},
ChainIO: () => {
const inputTyp = effTyp.getProperty('input')?.getTypeAtLocation(node)
const chainToKind = effTyp.getProperty('chainTo')?.getTypeAtLocation(node)
const [hashRes] = inputTyp ? accumulateResults(inputTyp, node) : []
const chainRes = `(${typeToString(chainToKind)} & { input: ${RESULT_TYPE_NAME}[${JSON.stringify(hashRes)}]['output'] })['return']`
const updateEffNode = effNode.replaceWithText(chainRes)
evalAccumulator(updateEffNode, node)
},
_: () => {
console.log(effNode.print())
console.log('TTTT', typeToString(effTyp))
console.log(`${name} effect is unhandled`)
}
})
}
if (typeRefNode) {
const resultType = entryPoint?.getType()
if (typeRefNode && entryPoint && resultType?.getSymbol()?.getName() === 'Program') {
const exitCodeTy = getPropertyType(typeRefNode, 'exitCode')
const effectTypes = getPropertyType(typeRefNode, 'effects')
if (effectTypes?.isTuple()) {
const effectNodes = entryPoint.getChildrenOfKind(SyntaxKind.TypeReference)
.flatMap(n => n.getChildrenOfKind(SyntaxKind.TupleType))
.flatMap(tt => tt.getChildrenOfKind(SyntaxKind.SyntaxList))
.flatMap(n => n.getChildren())
.filter(n => !n.isKind(SyntaxKind.CommaToken))
effectNodes.flatMap(n => evalAccumulator(n, typeRefNode))
}
process.exit(exitCodeTy?.getLiteralValue() as number)
} else {
const ty = typeChecker.getTypeAtLocation(typeRefNode)
console.log(typeToString(ty))
}
}
console.log(entryPoint?.print())
console.log(statement?.print())
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