added parser for v1 (calculator with no types)

src/ast.rs

@@ -0,0 +1,63 @@
+
+
+pub enum Operator {
+    Mul,
+    Div,
+    Plus,
+    Minus,
+    Gt,
+    Gte,
+    Lt,
+    Lte,
+    Eq,
+    Mod,
+    Exp,
+    FloorDiv,
+}
+
+
+pub struct LiteralInt {
+    pub value: i32
+}
+
+// pub struct LiteralString {
+//     value: String
+// }
+
+pub struct Identifier {
+    pub name: String
+}
+
+pub enum Expression {
+    LiteralInt(LiteralInt),
+    // LiteralString(LiteralString),
+    Identifier(Identifier),
+    Op(Box<Expression>, Operator, Box<Expression>),
+}
+
+pub struct Block {
+    pub expression: Box<Expression>
+}
+
+pub struct VariableDeclaration {
+    pub name: Identifier,
+    // type: Identifier,
+}
+
+pub struct Function {
+    pub name: Identifier,
+    // return_type: Identifier,
+    pub arguments: Vec<VariableDeclaration>,
+    pub block: Block,
+}
+
+
+// pub struct Assignment {
+//     variable: VariableDeclaration,
+//     expression: Expression,
+// }
+
+
+pub struct Program {
+    pub functions: Vec<Function>,
+}