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package moe.nea.lisp
sealed class LispData {
object LispNil : LispData()
data class Atom(val label: String) : LispData()
data class LispString(val string: String) : LispData()
data class LispNumber(val value: Double) : LispData()
data class LispNode(val node: LispAst.LispNode) : LispData()
sealed class LispExecutable() : LispData() {
abstract fun execute(
executionContext: LispExecutionContext,
callsite: LispAst.LispNode,
stackFrame: StackFrame,
args: List<LispAst.LispNode>
): LispData
}
abstract class JavaExecutable : LispExecutable()
data class LispInterpretedCallable(
val declarationStackFrame: StackFrame,
val argNames: List<String>,
val body: LispAst.Parenthesis,
val name: String?,
) : LispExecutable() {
override fun execute(
executionContext: LispExecutionContext,
callsite: LispAst.LispNode,
stackFrame: StackFrame,
args: List<LispAst.LispNode>
): LispData {
if (argNames.size != args.size) {
return executionContext.reportError(
"Expected ${argNames.size} arguments, got ${args.size} instead",
callsite
)
}
val invocationFrame = declarationStackFrame.fork()
for ((name, value) in argNames.zip(args)) {
invocationFrame.setValueLocal(name, executionContext.resolveValue(stackFrame, value))
}
return executionContext.executeLisp(invocationFrame, body)
}
}
companion object {
fun externalRawCall(callable: (context: LispExecutionContext, callsite: LispAst.LispNode, stackFrame: StackFrame, args: List<LispAst.LispNode>) -> LispData): LispExecutable {
return object : JavaExecutable() {
override fun execute(
executionContext: LispExecutionContext,
callsite: LispAst.LispNode,
stackFrame: StackFrame,
args: List<LispAst.LispNode>
): LispData {
return callable.invoke(executionContext, callsite, stackFrame, args)
}
}
}
fun externalCall(callable: (args: List<LispData>, reportError: (String) -> LispData) -> LispData): LispExecutable {
return object : JavaExecutable() {
override fun execute(
executionContext: LispExecutionContext,
callsite: LispAst.LispNode,
stackFrame: StackFrame,
args: List<LispAst.LispNode>
): LispData {
val mappedArgs = args.map { executionContext.resolveValue(stackFrame, it) }
return callable.invoke(mappedArgs) { executionContext.reportError(it, callsite) }
}
}
}
fun createLambda(
declarationStackFrame: StackFrame,
args: List<String>,
body: LispAst.Parenthesis,
nameHint: String? = null,
): LispExecutable {
return LispInterpretedCallable(declarationStackFrame, args, body, nameHint)
}
}
}
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