booleans, comparisons, and if/else

compiler/ast/ast.odin

@@ -68,6 +68,7 @@ Expr_Kind :: enum u8 {
 	Integer,
 	Float,
 	String,
+	Bool,
 	Array,
 	None,
 	Name,
@@ -81,7 +82,16 @@ Expr_Kind :: enum u8 {
 	Struct_Literal,
 	Keyed,
 	Negate,
+	Not,
 	Add,
+	Eq,
+	Ne,
+	Lt,
+	Le,
+	Gt,
+	Ge,
+	And,
+	Or,
 	Call,
 }
 
@@ -109,6 +119,7 @@ Stmt_Kind :: enum u8 {
 	Assignment,
 	Return,
 	Expression,
+	If,
 }
 
 Stmt :: struct {
@@ -119,6 +130,11 @@ Stmt :: struct {
 	immutable:  bool,
 	target:     Expr_Id,
 	expr:       Expr_Id,
+	// `If` statements use `expr` as the condition, `body` as the then-block, and
+	// `else_body` as the else-block. An `else if` chain is represented as an
+	// `else_body` holding a single nested `If` statement.
+	body:       []Stmt_Id,
+	else_body:  []Stmt_Id,
 	diagnostic: source.Diagnostic_Id,
 }
 
@@ -234,6 +250,10 @@ destroy_module :: proc(module: ^Module) {
 	for expr in module.exprs {
 		delete(expr.args, module.allocator)
 	}
+	for statement in module.statements {
+		delete(statement.body, module.allocator)
+		delete(statement.else_body, module.allocator)
+	}
 	for function in module.functions {
 		delete(function.params, module.allocator)
 		delete(function.body, module.allocator)