More variable stuff

v0/ast.h

@@ -17,6 +17,21 @@ typedef struct {
     bool is_public;
 } ImportDeclaration;
 
+typedef enum {
+    EXPRESSION_INTEGER,
+    EXPRESSION_STRING,
+    EXPRESSION_BOOLEAN
+} ExpressionTag;
+
+typedef struct {
+    ExpressionTag tag;
+    union {
+        int integer;
+        const char* string;
+        bool boolean;
+    };
+} Expression;
+
 typedef enum {
     TYPE_EXPRESSION_BUILTIN,
     TYPE_EXPRESSION_ARRAY
@@ -26,7 +41,7 @@ typedef enum {
  * An expression that evaluates to a type.
  */
 typedef struct TypeExpression TypeExpression;
-struct TypeExpression{
+struct TypeExpression {
     /** @brief defines which entry in the union is valid */
     TypeExpressionTag tag;
     union {
@@ -53,13 +68,10 @@ struct TypeExpression{
  */
 typedef struct {
     /** @brief The name of the alias. */
-    char* name;
+    const char* name;
 
     /** @brief The value of the alias. */
     TypeExpression value;
-
-    /** @brief Whether the import is public or not. */
-    bool is_public;
 } AliasDeclaration;
 
 /**
@@ -72,6 +84,9 @@ typedef struct {
     /** @brief The type of the variable. */
     TypeExpression type;
 
+    /** @brief The optional initializer expression. */
+    Expression* initializer;
+
     /** @brief Whether the variable is public or not. */
     bool is_public;