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Utilize CallableFunction to avoid Java dependency.

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This commit is contained in:
Alex Zenla 2023-08-19 16:58:34 -07:00
parent 7bec148d79
commit ef4045ecb4
Signed by: alex
GPG Key ID: C0780728420EBFE5
3 changed files with 10 additions and 9 deletions
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5
src/main/kotlin/gay/pizza/pork/eval/CallableFunction.kt Normal file
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@ -0,0 +1,5 @@
package gay.pizza.pork.eval
fun interface CallableFunction {
fun call(argument: Any): Any
}

5
src/main/kotlin/gay/pizza/pork/eval/Evaluator.kt
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@ -1,7 +1,6 @@
package gay.pizza.pork.eval package gay.pizza.pork.eval
import gay.pizza.pork.ast.* import gay.pizza.pork.ast.*
import java.util.function.Function
class Evaluator(root: Scope) : Visitor<Any> { class Evaluator(root: Scope) : Visitor<Any> {
private var currentScope: Scope = root private var currentScope: Scope = root
@ -21,8 +20,8 @@ class Evaluator(root: Scope) : Visitor<Any> {
return Unit return Unit
} }
override fun visitLambda(node: Lambda): Function<Any, Any> { override fun visitLambda(node: Lambda): CallableFunction {
return Function { _ -> return CallableFunction { _ ->
currentScope = currentScope.fork() currentScope = currentScope.fork()
try { try {
var value: Any? = null var value: Any? = null

9
src/main/kotlin/gay/pizza/pork/eval/Scope.kt
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@ -1,7 +1,5 @@
package gay.pizza.pork.eval package gay.pizza.pork.eval
import java.util.function.Function
class Scope(val parent: Scope? = null) { class Scope(val parent: Scope? = null) {
private val variables = mutableMapOf<String, Any>() private val variables = mutableMapOf<String, Any>()
@ -25,12 +23,11 @@ class Scope(val parent: Scope? = null) {
fun call(name: String, argument: Any = Unit): Any { fun call(name: String, argument: Any = Unit): Any {
val value = value(name) val value = value(name)
if (value !is Function<*, *>) { if (value !is CallableFunction) {
throw RuntimeException("$value is not callable.") throw RuntimeException("$value is not callable.")
} }
@Suppress("UNCHECKED_CAST") val function = value as CallableFunction
val casted = value as Function<Any, Any> return function.call(argument)
return casted.apply(argument)
} }
fun fork(): Scope { fun fork(): Scope {