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package moe.nea.lisp.bind
import moe.nea.lisp.*
import java.lang.invoke.MethodHandles
import java.lang.reflect.Method
import java.lang.reflect.Modifier
import java.lang.reflect.Parameter
typealias ObjectMapper = (() -> LispData, () -> LispAst, ErrorReporter, () -> Boolean) -> (Any?)
class AutoBinder {
companion object {
val Parameter.effectiveType get() = if (this.isVarArgs) this.type.componentType else this.type
}
private fun mapLispData(parameter: Parameter): ObjectMapper? {
if (LispData::class.java.isAssignableFrom(parameter.effectiveType)) return { a, b, c, d ->
parameter.effectiveType.cast(
a()
)
}
return null
}
private fun mapErrorReporter(parameter: Parameter): ObjectMapper? {
if (ErrorReporter::class.java.isAssignableFrom(parameter.effectiveType)) return { a, b, c, d -> c }
return null
}
private fun mapString(parameter: Parameter): ObjectMapper? {
if (String::class.java == parameter.effectiveType) return { a, b, c, d ->
when (val x = a()) {
is LispData.LispString -> x.string
is LispData.Atom -> x.label
else -> null.also { c.reportError("Could not coerce $x to string") }
}
}
return null
}
private fun mapBoolean(parameter: Parameter): ObjectMapper? {
if (Boolean::class.java.isAssignableFrom(parameter.effectiveType)) return { a, b, c, d ->
val x = a()
val y = CoreBindings.isTruthy(x)
if (y == null) {
c.reportError("Could not coerce $x to a boolean")
}
y
}
return null
}
private fun mapAST(parameter: Parameter): ObjectMapper? {
if (LispAst::class.java.isAssignableFrom(parameter.effectiveType)) return { a, b, c, d ->
parameter.effectiveType.cast(
b()
)
}
return null
}
private fun mapNumber(parameter: Parameter): ObjectMapper? {
if (Double::class.java.isAssignableFrom(parameter.effectiveType)) return { a, b, c, d ->
when (val x = a()) {
is LispData.LispNumber -> x.value
else -> null.also { c.reportError("Could not coerce $x to number") }
}
}
if (Float::class.java.isAssignableFrom(parameter.effectiveType)) return { a, b, c, d ->
when (val x = a()) {
is LispData.LispNumber -> x.value.toFloat()
else -> null.also { c.reportError("Could not coerce $x to number") }
}
}
if (Int::class.java.isAssignableFrom(parameter.effectiveType)) return { a, b, c, d ->
when (val x = a()) {
is LispData.LispNumber -> x.value.toInt()
else -> null.also { c.reportError("Could not coerce $x to number") }
}
}
if (Long::class.java.isAssignableFrom(parameter.effectiveType)) return { a, b, c, d ->
when (val x = a()) {
is LispData.LispNumber -> x.value.toLong()
else -> null.also { c.reportError("Could not coerce $x to number") }
}
}
return null
}
val objectMappers = mutableListOf<((Parameter) -> ObjectMapper?)>(
::mapLispData,
::mapErrorReporter,
::mapNumber,
::mapString,
::mapBoolean,
::mapAST,
)
fun generateInstanceBindings(obj: Any): Map<String, LispData> {
val bindings = mutableMapOf<String, LispData>()
for (method in obj.javaClass.methods) {
val annotation = method.getAnnotation(LispBinding::class.java) ?: continue
require(LispParser.isValidIdentifier(annotation.name))
bindings[annotation.name] = wrapMethod(obj, annotation.name, method)
}
// TODO: field bindings
return bindings
}
open fun makeVarArgMapper(
parameter: Parameter,
baseMapper: ObjectMapper
): ObjectMapper? {
return { a, b, c, d ->
val l = buildList {
while (d())
add(baseMapper(a, b, c, d)!!)
}
val a = java.lang.reflect.Array.newInstance(parameter.type.componentType, l.size) as Array<Any>
l.withIndex().forEach { a[it.index] = it.value }
a
}
}
private val lookup = MethodHandles.publicLookup()
fun wrapMethod(obj: Any, name: String, method: Method): LispData.LispExecutable {
var mh = lookup.unreflect(method)
if (method.modifiers and Modifier.STATIC == 0) {
mh = mh.bindTo(obj)
}
val objectMappers = method.parameters.map { param ->
val baseMapper = objectMappers.firstNotNullOfOrNull { it.invoke(param) }
?: error("Could not find object mapper for parameter $param")
if (param.isVarArgs) {
makeVarArgMapper(param, baseMapper)
?: error("Could not transform object mapper to vararg object mapper")
} else
baseMapper
}
return LispData.externalRawCall(name) { context: LispExecutionContext, callsite: LispAst.LispNode, stackFrame: StackFrame, args: List<LispAst.LispNode> ->
val e = object : ErrorReporter {
override fun reportError(string: String): LispData {
return stackFrame.reportError(string, callsite)
}
}
try {
val iterator = args.iterator()
val (a, b, c) = Triple({ context.resolveValue(stackFrame, iterator.next()) }, { iterator.next() }, e)
val p = objectMappers.map {
it.invoke(a, b, c, { iterator.hasNext() })
?: return@externalRawCall LispData.LispNil
}
if (iterator.hasNext()) return@externalRawCall e.reportError("Too many arguments")
mh.invokeWithArguments(p) as LispData
} catch (x: Exception) {
e.reportError("$name threw an exception", x)
}
}
}
fun bindTo(obj: Any, frame: StackFrame) {
frame.variables.putAll(generateInstanceBindings(obj))
}
}
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