parser

src/ast/mod.rs

@@ -1,3 +1,5 @@
+use crate::token;
+
 trait NodeTrait {
     fn token_literal(&self) -> String;
 }
@@ -9,6 +11,14 @@ trait StatementTrait: NodeTrait {
 trait ExpressionTrait: NodeTrait {
     fn expression_node(&self);
 }
+struct Expression {
+    //
+}
+impl NodeTrait for Expression {
+    fn token_literal(&self) -> String {
+        todo!()
+    }
+}
 
 struct Statement {
     //
@@ -23,7 +33,7 @@ impl StatementTrait for Statement {
     fn statement_node(&self) {}
 }
 
-struct Program {
+pub struct Program {
     statements: Vec<Statement>,
 }
 
@@ -36,3 +46,38 @@ impl NodeTrait for Program {
         }
     }
 }
+
+struct LetStatement {
+    token: token::Token,
+    name: Identifier,
+    value: Expression,
+}
+
+impl NodeTrait for LetStatement {
+    fn token_literal(&self) -> String {
+        String::from(&self.token.literal)
+    }
+}
+
+impl StatementTrait for LetStatement {
+    fn statement_node(&self) {
+        todo!()
+    }
+}
+
+struct Identifier {
+    token: token::Token,
+    value: String,
+}
+
+impl NodeTrait for Identifier {
+    fn token_literal(&self) -> String {
+        String::from(&self.token.literal)
+    }
+}
+
+impl ExpressionTrait for Identifier {
+    fn expression_node(&self) {
+        todo!()
+    }
+}