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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
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@ -3,19 +3,19 @@ package gay.pizza.pork.eval
import gay.pizza.pork.ast.* import gay.pizza.pork.ast.*
import java.util.function.Function import java.util.function.Function
class Evaluator(root: Context) : Visitor<Any> { class Evaluator(root: Scope) : Visitor<Any> {
private var currentContext: Context = root private var currentScope: Scope = root
override fun visitDefine(node: Define): Any { override fun visitDefine(node: Define): Any {
val value = visit(node.value) val value = visit(node.value)
currentContext.define(node.symbol.id, value) currentScope.define(node.symbol.id, value)
return 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 = override fun visitReference(node: SymbolReference): Any =
currentContext.value(node.symbol.id) currentScope.value(node.symbol.id)
override fun visitSymbol(node: Symbol): Any { override fun visitSymbol(node: Symbol): Any {
return Unit return Unit
@ -23,7 +23,7 @@ class Evaluator(root: Context) : Visitor<Any> {
override fun visitLambda(node: Lambda): Function<Any, Any> { override fun visitLambda(node: Lambda): Function<Any, Any> {
return Function { _ -> return Function { _ ->
currentContext = currentContext.fork() currentScope = currentScope.fork()
try { try {
var value: Any? = null var value: Any? = null
for (expression in node.expressions) { for (expression in node.expressions) {
@ -31,7 +31,7 @@ class Evaluator(root: Context) : Visitor<Any> {
} }
value ?: Unit value ?: Unit
} finally { } 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
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@ -2,7 +2,7 @@ package gay.pizza.pork.eval
import java.util.function.Function import java.util.function.Function
class Context(val parent: Context? = null) { class Scope(val parent: Scope? = null) {
private val variables = mutableMapOf<String, Any>() private val variables = mutableMapOf<String, Any>()
fun define(name: String, value: Any) { fun define(name: String, value: Any) {
@ -33,11 +33,11 @@ class Context(val parent: Context? = null) {
return casted.apply(argument) return casted.apply(argument)
} }
fun fork(): Context { fun fork(): Scope {
return Context(this) return Scope(this)
} }
fun leave(): Context { fun leave(): Scope {
if (parent == null) { if (parent == null) {
throw RuntimeException("Parent context not found.") throw RuntimeException("Parent context not found.")
} }

8
src/main/kotlin/gay/pizza/pork/main.kt
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@ -1,7 +1,7 @@
package gay.pizza.pork package gay.pizza.pork
import gay.pizza.pork.ast.* 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.eval.Evaluator
import gay.pizza.pork.parse.* import gay.pizza.pork.parse.*
import kotlin.io.path.Path import kotlin.io.path.Path
@ -9,10 +9,10 @@ import kotlin.io.path.readText
fun main(args: Array<String>) { fun main(args: Array<String>) {
fun eval(ast: Program) { fun eval(ast: Program) {
val context = Context() val scope = Scope()
val evaluator = Evaluator(context) val evaluator = Evaluator(scope)
evaluator.visit(ast) evaluator.visit(ast)
println("> ${context.call("main")}") println("> ${scope.call("main")}")
} }
val code = Path(args[0]).readText() val code = Path(args[0]).readText()