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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()
class LispList(val elements: List<LispData>) : LispData()
sealed class LispExecutable() : LispData() {
abstract fun execute(
executionContext: LispExecutionContext,
callsite: LispAst.LispNode,
stackFrame: StackFrame,
args: List<LispAst.LispNode>
): LispData
}
abstract class JavaExecutable(val name: String) : 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 {
val invocationFrame = declarationStackFrame.fork()
if (argNames.lastOrNull() == "...") {
for ((name, value) in argNames.dropLast(1).zip(args)) {
invocationFrame.setValueLocal(name, executionContext.resolveValue(stackFrame, value))
}
invocationFrame.setValueLocal(
"...",
LispList(
args.drop(argNames.size - 1).map { executionContext.resolveValue(stackFrame, it) })
)
} else if (argNames.size != args.size) {
return stackFrame.reportError(
"Expected ${argNames.size} arguments, got ${args.size} instead",
callsite
)
} else
for ((name, value) in argNames.zip(args)) {
invocationFrame.setValueLocal(name, executionContext.resolveValue(stackFrame, value))
}
return executionContext.executeLisp(invocationFrame, body)
}
}
companion object {
fun externalRawCall(
name: String,
callable: (context: LispExecutionContext, callsite: LispAst.LispNode, stackFrame: StackFrame, args: List<LispAst.LispNode>) -> LispData
): LispExecutable {
return object : JavaExecutable(name) {
override fun execute(
executionContext: LispExecutionContext,
callsite: LispAst.LispNode,
stackFrame: StackFrame,
args: List<LispAst.LispNode>
): LispData {
return callable.invoke(executionContext, callsite, stackFrame, args)
}
}
}
fun externalCall(
name: String,
callable: (args: List<LispData>, reportError: (String) -> LispData) -> LispData
): LispExecutable {
return object : JavaExecutable(name) {
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) { stackFrame.reportError(it, callsite) }
}
}
}
fun createLambda(
declarationStackFrame: StackFrame,
args: List<String>,
body: LispAst.Parenthesis,
nameHint: String? = null,
): LispExecutable {
return LispInterpretedCallable(declarationStackFrame, args, body, nameHint)
}
fun boolean(b: Boolean): Atom {
return if (b) {
CoreBindings.trueValue
} else {
CoreBindings.falseValue
}
}
}
}
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