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Rename context to scope.

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This commit is contained in:
Alex Zenla 2023-08-19 16:52:40 -07:00
parent 6494858f02
commit 7bec148d79
Signed by: alex
GPG Key ID: C0780728420EBFE5
3 changed files with 15 additions and 15 deletions
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14
src/main/kotlin/gay/pizza/pork/eval/Evaluator.kt
View File

@ -3,19 +3,19 @@ package gay.pizza.pork.eval
import gay.pizza.pork.ast.*
import java.util.function.Function
class Evaluator(root: Context) : Visitor<Any> {
private var currentContext: Context = root
class Evaluator(root: Scope) : Visitor<Any> {
private var currentScope: Scope = root
override fun visitDefine(node: Define): Any {
val value = visit(node.value)
currentContext.define(node.symbol.id, value)
currentScope.define(node.symbol.id, value)
return value
}
override fun visitFunctionCall(node: FunctionCall): Any = currentContext.call(node.symbol.id)
override fun visitFunctionCall(node: FunctionCall): Any = currentScope.call(node.symbol.id)
override fun visitReference(node: SymbolReference): Any =
currentContext.value(node.symbol.id)
currentScope.value(node.symbol.id)
override fun visitSymbol(node: Symbol): Any {
return Unit
@ -23,7 +23,7 @@ class Evaluator(root: Context) : Visitor<Any> {
override fun visitLambda(node: Lambda): Function<Any, Any> {
return Function { _ ->
currentContext = currentContext.fork()
currentScope = currentScope.fork()
try {
var value: Any? = null
for (expression in node.expressions) {
@ -31,7 +31,7 @@ class Evaluator(root: Context) : Visitor<Any> {
}
value ?: Unit
} finally {
currentContext = currentContext.leave()
currentScope = currentScope.leave()
}
}
}

8
src/main/kotlin/gay/pizza/pork/eval/Context.kt → src/main/kotlin/gay/pizza/pork/eval/Scope.kt
View File

@ -2,7 +2,7 @@ package gay.pizza.pork.eval
import java.util.function.Function
class Context(val parent: Context? = null) {
class Scope(val parent: Scope? = null) {
private val variables = mutableMapOf<String, Any>()
fun define(name: String, value: Any) {
@ -33,11 +33,11 @@ class Context(val parent: Context? = null) {
return casted.apply(argument)
}
fun fork(): Context {
return Context(this)
fun fork(): Scope {
return Scope(this)
}
fun leave(): Context {
fun leave(): Scope {
if (parent == null) {
throw RuntimeException("Parent context not found.")
}

8
src/main/kotlin/gay/pizza/pork/main.kt
View File

@ -1,7 +1,7 @@
package gay.pizza.pork
import gay.pizza.pork.ast.*
import gay.pizza.pork.eval.Context
import gay.pizza.pork.eval.Scope
import gay.pizza.pork.eval.Evaluator
import gay.pizza.pork.parse.*
import kotlin.io.path.Path
@ -9,10 +9,10 @@ import kotlin.io.path.readText
fun main(args: Array<String>) {
fun eval(ast: Program) {
val context = Context()
val evaluator = Evaluator(context)
val scope = Scope()
val evaluator = Evaluator(scope)
evaluator.visit(ast)
println("> ${context.call("main")}")
println("> ${scope.call("main")}")
}
val code = Path(args[0]).readText()