implemented basic parsing

parser.h

@@ -0,0 +1,145 @@
+#ifndef PARSER_H
+#define PARSER_H
+
+#include "lexer.h"
+#include "utils.h"
+
+typedef enum {
+	OP_PLUS, // +
+	OP_MINUS, // -
+	OP_DIV, // /
+	OP_MUL, // *
+	OP_EQ, // ==
+	OP_ASSIGN, // =
+	OP_AND, // &&
+	OP_OR, // ||
+	OP_NEQ, // !=
+	OP_GT, // >
+	OP_LT, // <
+	OP_GE, // >=
+	OP_LE, // <=
+	OP_BOR, // |
+	OP_BAND, // &
+	OP_BXOR, // ^
+	OP_MOD, // %
+	OP_PLUS_EQ, // +=
+	OP_MINUS_EQ, // -=
+	OP_DIV_EQ, // /=
+	OP_MUL_EQ, // *=
+	OP_BOR_EQ, // |=
+	OP_BAND_EQ, // &=
+	OP_BXOR_EQ, // ^=
+	OP_MOD_EQ, // %=
+} binary_op;
+
+typedef enum {
+	UOP_INCR, // ++
+	UOP_MINUS, // -
+	UOP_DECR, // --
+	UOP_DEREF, // *
+	UOP_REF, // &
+	UOP_NOT, // !
+} unary_op;
+
+typedef enum {
+	LAYOUT_AUTO,
+	LAYOUT_PACKED,
+	LAYOUT_EXTERN
+} struct_layout;
+
+typedef struct {
+	char *type_name;
+	usize type_len;
+	char *name;
+	usize name_len;
+	usize offset;
+} member;
+
+typedef struct {
+	char *name;
+	usize name_len;
+	member *params;
+} function_decl;
+
+typedef enum {
+	NODE_IDENTIFIER,
+	NODE_INTEGER,
+	NODE_FLOAT,
+	NODE_STRING,
+	NODE_CHAR,
+	NODE_TERNARY,
+	NODE_CAST,
+	NODE_ARRAY_SUBSCRIPT,
+	NODE_ACCESS,
+	NODE_ACCESS_PTR,
+	NODE_CALL,
+	NODE_POSTFIX,
+	NODE_UNARY,
+	NODE_BINARY,
+	NODE_GOTO,
+	NODE_BREAK,
+	NODE_CASE,
+	NODE_SWITCH,
+	NODE_FOR,
+	NODE_DO,
+	NODE_WHILE,
+	NODE_IF,
+	NODE_RETURN,
+	NODE_COMPOUND,
+	NODE_TYPEDEF,
+	NODE_ENUM,
+	NODE_STRUCT,
+	NODE_UNION,
+	NODE_VAR_DECL,
+	NODE_FUNCTION_DEF,
+	NODE_FUNCTION_DECL,
+	NODE_UNIT,
+	NODE_AS,
+} node_type;
+
+typedef struct _ast_node {
+	node_type type;
+	union {
+		struct {
+			struct _ast_node *left;
+			struct _ast_node *right;
+			binary_op operator;
+		} binary;
+		struct {
+			struct _ast_node *right;
+			unary_op operator;
+		} unary;
+		u64 integer;
+		f64 flt; // float
+		struct {
+			char *start;
+			usize len;
+		} string;
+		char ch; // char;
+		struct {
+			struct _ast_node *condition;
+			struct _ast_node *then;
+			struct _ast_node *otherwise;
+		} ternary;
+		struct {
+			struct _ast_node *value;
+			char *type;
+			usize type_len;
+		} cast;
+		struct {
+			struct _ast_node *expr;
+			struct _ast_node *next;
+		} unit_node;
+	} expr;
+} ast_node;
+
+typedef struct {
+	token *tokens;
+	token *previous;
+	ast_node *ast;
+	arena *allocator;
+} parser;
+
+parser *parser_init(lexer *l, arena *allocator);
+
+#endif