parser: implement long literal and handle overflow

ast/src/main/kotlin/gay/pizza/pork/ast/LongLiteral.kt

@@ -0,0 +1,25 @@
+// GENERATED CODE FROM PORK AST CODEGEN
+package gay.pizza.pork.ast
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+@Serializable
+@SerialName("longLiteral")
+class LongLiteral(val value: Long) : Expression() {
+  override val type: NodeType = NodeType.LongLiteral
+
+  override fun <T> visit(visitor: NodeVisitor<T>): T =
+    visitor.visitLongLiteral(this)
+
+  override fun equals(other: Any?): Boolean {
+    if (other !is LongLiteral) return false
+    return other.value == value
+  }
+
+  override fun hashCode(): Int {
+    var result = value.hashCode()
+    result = 31 * result + type.hashCode()
+    return result
+  }
+}

ast/src/main/kotlin/gay/pizza/pork/ast/NodeCoalescer.kt

@@ -50,6 +50,9 @@ class NodeCoalescer(val handler: (Node) -> Unit) : NodeVisitor<Unit> {
   override fun visitListLiteral(node: ListLiteral): Unit =
     handle(node)
 
+  override fun visitLongLiteral(node: LongLiteral): Unit =
+    handle(node)
+
   override fun visitNative(node: Native): Unit =
     handle(node)
 

ast/src/main/kotlin/gay/pizza/pork/ast/NodeType.kt

@@ -22,6 +22,7 @@ enum class NodeType(val parent: NodeType? = null) {
   LetAssignment(Expression),
   LetDefinition(Definition),
   ListLiteral(Expression),
+  LongLiteral(Expression),
   Native(Node),
   Parentheses(Expression),
   PrefixOperation(Expression),

ast/src/main/kotlin/gay/pizza/pork/ast/NodeVisitor.kt

@@ -34,6 +34,8 @@ interface NodeVisitor<T> {
 
   fun visitListLiteral(node: ListLiteral): T
 
+  fun visitLongLiteral(node: LongLiteral): T
+
   fun visitNative(node: Native): T
 
   fun visitParentheses(node: Parentheses): T

ast/src/main/kotlin/gay/pizza/pork/ast/NodeVisitorExtensions.kt

@@ -17,6 +17,7 @@ fun <T> NodeVisitor<T>.visit(node: Node): T =
     is If -> visitIf(node)
     is ImportDeclaration -> visitImportDeclaration(node)
     is IntegerLiteral -> visitIntegerLiteral(node)
+    is LongLiteral -> visitLongLiteral(node)
     is DoubleLiteral -> visitDoubleLiteral(node)
     is ListLiteral -> visitListLiteral(node)
     is Parentheses -> visitParentheses(node)