[tlox] Add string and boolean literals

jlox/tlox/src/main/java/xyz/ctsk/lox/Main.java

@@ -1,6 +1,5 @@
 package xyz.ctsk.lox;
 
-import com.oracle.truffle.api.Truffle;
 import xyz.ctsk.lox.nodes.LoxRootNode;
 import xyz.ctsk.lox.parser.LoxParser;
 

jlox/tlox/src/main/java/xyz/ctsk/lox/nodes/expr/LoxBooleanLiteralNode.java

@@ -0,0 +1,17 @@
+package xyz.ctsk.lox.nodes.expr;
+
+import com.oracle.truffle.api.frame.VirtualFrame;
+import xyz.ctsk.lox.nodes.LoxExpressionNode;
+
+public class LoxBooleanLiteralNode extends LoxExpressionNode {
+    private final boolean value;
+
+    public LoxBooleanLiteralNode(boolean value) {
+        this.value = value;
+    }
+
+    @Override
+    public Object executeGeneric(VirtualFrame frame) {
+        return value;
+    }
+}

jlox/tlox/src/main/java/xyz/ctsk/lox/nodes/expr/LoxStringLiteralNode.java

@@ -0,0 +1,18 @@
+package xyz.ctsk.lox.nodes.expr;
+
+import com.oracle.truffle.api.frame.VirtualFrame;
+import com.oracle.truffle.api.strings.TruffleString;
+import xyz.ctsk.lox.nodes.LoxExpressionNode;
+
+public class LoxStringLiteralNode extends LoxExpressionNode {
+    private final TruffleString value;
+
+    public LoxStringLiteralNode(TruffleString value) {
+        this.value = value;
+    }
+
+    @Override
+    public Object executeGeneric(VirtualFrame frame) {
+        return value;
+    }
+}

jlox/tlox/src/main/java/xyz/ctsk/lox/parser/LoxNodeFactory.java

@@ -1,5 +1,6 @@
 package xyz.ctsk.lox.parser;
 
+import com.oracle.truffle.api.strings.TruffleString;
 import org.antlr.v4.runtime.Token;
 import xyz.ctsk.lox.LoxException;
 import xyz.ctsk.lox.nodes.LoxExpressionNode;
@@ -11,6 +12,16 @@ public class LoxNodeFactory {
         return new LoxNumberLiteralNode(value);
     }
 
+    public static LoxStringLiteralNode createStringLiteral(Token literalToken) {
+        var value = TruffleString.fromJavaStringUncached(literalToken.getText(), TruffleString.Encoding.UTF_16);
+        return new LoxStringLiteralNode(value);
+    }
+
+    public static LoxBooleanLiteralNode createBooleanLiteral(Token literalToken) {
+        var value = Boolean.parseBoolean(literalToken.getText());
+        return new LoxBooleanLiteralNode(value);
+    }
+
     public static LoxExpressionNode createUnary(Token op, LoxExpressionNode value) {
         return switch (op.getText()) {
             case "-" -> LoxNegNodeGen.create(value);

jlox/tlox/src/main/resources/xyz/ctsk/lox/parser/Lox.g4

@@ -45,6 +45,9 @@ expression returns [LoxExpressionNode result]
 
 literal returns [LoxExpressionNode result]
     : NUMBER { $result = factory.createNumberLiteral($NUMBER); }
+    | STRING { $result = factory.createStringLiteral($STRING); }
+    | TRUE   { $result = factory.createBooleanLiteral($TRUE); }
+    | FALSE  { $result = factory.createBooleanLiteral($FALSE); }
     ;
 
 AND: 'and' ;