Add boilerplate for parser

1 files changed, 38 insertions, 150 deletions

diff --git a/src/parser.h b/src/parser.h
index 2604be4..3e016d3 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -3,162 +3,50 @@
 
 #include "lexer.h"
 
-typedef struct Environment {
-    struct Object **locals;
-    struct Object **local_values;
-    struct Object **params;
-    struct Object **captured;
-    struct Environment *parent;
-} Environment;
-
-typedef enum ObjectType {
-    OBJ_TYPE_NIL,
-    OBJ_TYPE_TRUE,
-    OBJ_TYPE_FALSE,
-    OBJ_TYPE_FIXNUM,
-    OBJ_TYPE_SYMBOL,
-    OBJ_TYPE_STRING,
-    OBJ_TYPE_PAIR,
-    OBJ_TYPE_LAMBDA,
-    OBJ_TYPE_IF,
-    OBJ_TYPE_DEF,
-    OBJ_TYPE_SET,
-    OBJ_TYPE_BUILTIN,
-} ObjectType;
-
-typedef enum Builtin {
-    BUILTIN_ADD,
-    BUILTIN_SUB,
-    BUILTIN_MUL,
-    BUILTIN_DIV,
-    BUILTIN_MOD,
-    BUILTIN_EQ,
-    BUILTIN_LT,
-    BUILTIN_GT,
-    BUILTIN_LE,
-    BUILTIN_GE,
-    BUILTIN_NOT,
-    BUILTIN_AND,
-    BUILTIN_OR,
-    BUILTIN_IS_NIL,
-    BUILTIN_IS_ZERO,
-    BUILTIN_IS_FIXNUM,
-    BUILTIN_IS_BOOL,
-    BUILTIN_PRINT,
-    BUILTIN_CONS,
-    BUILTIN_CAR,
-    BUILTIN_CDR,
-} Builtin;
-
-typedef struct Object {
-    ObjectType type;
-    union {
-        // OBJ_TYPE_FIXNUM
-        ssize_t fixnum;
-
-        // OBJ_TYPE_STRING
-        // OBJ_TYPE_SYMBOL
-        StringView text;
-
-        // OBJ_TYPE_PAIR
-        struct {
-            struct Object *head;
-            struct Object *tail;
-            size_t n_elems;
-        };
-
-        // OBJ_TYPE_LAMBDA
-         struct {
-             struct Object **params;
-             struct Object **body;
-             Environment *env;
-         };
-
-         // OBJ_TYPE_IF
-         struct {
-             struct Object *condition;
-             struct Object *expr_true;
-             struct Object *expr_false;
-         };
-
-         // OBJ_TYPE_DEF
-         // OBJ_TYPE_SET
-         struct {
-             struct Object *var_name;
-             struct Object *var_expr;
-         };
-
-         // OBJ_TYPE_BUILTIN
-         struct {
-             Builtin builtin;
-             StringView builtin_text;
-         };
-    };
-
-    bool visited;
-    size_t line;
-    size_t col;
-} Object;
-
 typedef struct Parser {
     Token *tokens;
     size_t current;
 } Parser;
 
-typedef Object* Root;
-
-typedef struct Program {
-    Root *roots;
-    Environment *env;
-} Program;
-
-// Token scanner.
-Token next_token(Parser *parser);
-Token previous_token(Parser *parser);
-Token rewind_token(Parser *parser);
-Token peek_token(const Parser *parser);
-bool has_next_token(const Parser *parser);
-
-// Parsing operations.
-Object * parse_tree(Parser *parser, Errors *errors);
-Object * parse_symbol(Token tok);
-Object * parse_string(Token tok);
-Object * parse_bool(Token tok);
-Object * parse_fixnum(Token tok);
-Object * parse_list(Parser *parser, Errors *errors);
-Object * parse_lambda(Parser *parser, Errors *errors);
-Object * parse_if(Parser *parser, Errors *errors);
-Object * parse_var(Parser *parser, Errors *errors);
-Program parse(Token *tokens, Errors *errors);
+typedef enum NodeType {
+    NODE_ERR,
+    // NODE_FUNCALL,
+    // NODE_U64,
+    // NODE_U32,
+    // NODE_U16,
+    // NODE_U8,
+    // NODE_S64,
+    // NODE_S32,
+    // NODE_S16,
+    // NODE_S8,
+    NODE_NUMBER,
+    NODE_STRING,
+} NodeType;
+
+typedef struct Node {
+    NodeType type;
 
-// Object operations.
-void object_display(Object *obj);
-bool object_equal(Object *a, Object *b);
-
-// Manage resources.
-Environment * env_alloc(Environment *parent);
-Object * object_alloc(Token tok, ObjectType type);
-void object_free(Object *node);
-void free_objects(void);
-
-//
-// Helper macros.
-//
-
-// Type checking.
-#define IS_NIL(VAL)    ((VAL)->type == OBJ_TYPE_NIL)
-#define IS_TRUE(VAL)   ((VAL)->type != OBJ_TYPE_FALSE)
-#define IS_FALSE(VAL)  ((VAL)->type == OBJ_TYPE_FALSE)
-#define IS_BOOL(VAL)   \
-    (((VAL)->type == OBJ_TYPE_FALSE) || ((VAL)->type == OBJ_TYPE_TRUE))
-#define IS_FIXNUM(VAL) ((VAL)->type == OBJ_TYPE_FIXNUM)
-#define IS_STRING(VAL) ((VAL)->type == OBJ_TYPE_STRING)
-#define IS_SYMBOL(VAL) ((VAL)->type == OBJ_TYPE_SYMBOL)
-#define IS_PAIR(VAL)   ((VAL)->type == OBJ_TYPE_PAIR)
-#define IS_LAMBDA(VAL) ((VAL)->type == OBJ_TYPE_LAMBDA)
-#define IS_BUILTIN(VAL) ((VAL)->type == OBJ_TYPE_BUILTIN)
+    union {
+        // Integer numbers.
+        // u64 as_u64;
+        // u32 as_u32;
+        // u16 as_u16;
+        // u8  as_u8;
+        // s64 as_s64;
+        // s32 as_s32;
+        // s16 as_s16;
+        // s8  as_s8;
+        s64 number;
+
+        // String.
+        StringView string;
+        // struct {
+        //     u8 *str;
+        //     u64 n;
+        // } as_str;
+    };
+} Node;
 
-// Debug.
-#define OBJ_PRINT(OBJ) object_display(OBJ); printf("\n");
+void parse(Token *tokens);
 
 #endif // BDL_PARSER_H