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Update a lot of things so that it is easier to expand upon in the future #1

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Update a lot of things so that it is easier to expand upon in the future #1

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54 changes: 0 additions & 54 deletions src/AST.kt
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This file was deleted.

32 changes: 15 additions & 17 deletions src/Environment.kt
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Original file line number Diff line number Diff line change
@@ -1,41 +1,40 @@
import ast.ASTNode

data class ValueAndConstStatus(var value: ASTNode, val constant: Boolean)

class Environment(val parent: Environment?) {
data class ValueAndConstStatus(var value: Value, val constant: Boolean)
val values = HashMap<String, ValueAndConstStatus>()

fun assignUp(name: String, value: Value) : Boolean {
fun assignUp(name: String, value: ASTNode): Boolean {
if (values.contains(name)) {
if (values[name]!!.constant) {
throw Exception("Interpreter error: Cannot reassign constant $name")
}
values[name]?.value = value
return true
}
else if (parent != null) {
} else if (parent != null) {
return parent.assignUp(name, value)
}
return false
}

fun assign(name: String, value: Value, constant: Boolean) {
if (values.contains(name)) {
if (values[name]!!.constant) {
throw Exception("Interpreter error: Cannot reassign constant $name")
}
fun assign(name: String, value: ASTNode, constant: Boolean) {
if (values.contains(name) && values[name]!!.constant) {
throw Exception("Interpreter error: Cannot reassign constant $name")
}
if (assignUp(name, value)) {
return
}

if(name in values) {
if (!values.contains(name)) {
values[name] = ValueAndConstStatus(value, constant)
}
else {
} else {
throw Exception("Interpreter error: Cannot assign variable $name which has not been defined. If this is supposed to be new, prefix it with 'let' or 'const'")
}
}


fun let(name: String, value: Value, constant: Boolean) {
fun let(name: String, value: ASTNode, constant: Boolean) {
if (values.contains(name)) {
if (values[name]!!.constant) {
throw Exception("Interpreter error: Cannot reassign constant $name")
Expand All @@ -44,11 +43,10 @@ class Environment(val parent: Environment?) {
values[name] = ValueAndConstStatus(value, constant)
}

fun get(name: String) : Value? {
fun get(name: String): ASTNode? {
if (values.contains(name)) {
return values[name]?.value
}
else if(parent != null){
return values[name]!!.value
} else if (parent != null) {
return parent.get(name)
}
return null
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