feat: implement lexer+parser for example program

include/compiler/fzl_parser.h

@@ -0,0 +1,58 @@
+#ifndef FZL_PARSER_H
+#define FZL_PARSER_H
+
+#include <stddef.h>
+#include <compiler/fzl_token.h>
+#include <compiler/fzl_reader.h>
+
+// AST node type
+typedef enum {
+	FZL_NODETYPE_BLOCK,
+	FZL_NODETYPE_CALL,
+	FZL_NODETYPE_LITERAL,
+} fzl_nodetype_t;
+
+// AST node descriptor
+typedef struct fzl_node {
+	fzl_nodetype_t type;
+	fzl_token_t *token;
+	struct fzl_node *parent;
+	struct fzl_node *next;
+
+	union {
+		struct {
+			struct fzl_node **entries;
+			size_t entry_count;
+		} list;
+	};
+} fzl_node_t;
+
+// Token sequence parser descriptor
+typedef struct {
+	fzl_reader_ll_t *first;
+	size_t token_count;
+
+	fzl_reader_ll_t *cursor;
+	fzl_node_t *root;
+} fzl_parser_t;
+
+// Allocate parser
+fzl_parser_t *fzl_mkparser(fzl_reader_ll_t *first);
+
+// Allocate new node
+fzl_node_t *fzl_mknode(fzl_nodetype_t type, fzl_token_t *tok);
+
+// Parse tokens
+int fzl_parse(fzl_parser_t *parser);
+
+// Get last parser error
+char *fzl_parser_geterror();
+
+// Free node
+void fzl_freenode(fzl_node_t* node);
+
+// Free parser
+void fzl_freeparser(fzl_parser_t *parser);
+
+#endif//FZL_PARSER_H
+