feat: implement M1 Ferro frontend

fec/src/ast.h

@@ -0,0 +1,41 @@
+#ifndef FE_AST_H
+#define FE_AST_H
+
+#include "arena.h"
+#include "lexer.h"
+#include <stdio.h>
+
+typedef enum FeNodeKind {
+    FE_N_UNIT, FE_N_IMPORT, FE_N_FN, FE_N_STRUCT, FE_N_ENUM, FE_N_ERROR_DECL, FE_N_CONST,
+    FE_N_GLOBAL, FE_N_FIELD, FE_N_PARAM, FE_N_VARIANT, FE_N_BLOCK, FE_N_LET, FE_N_VAR,
+    FE_N_EXPR_STMT, FE_N_ASSIGN, FE_N_IF, FE_N_WHILE, FE_N_FOR, FE_N_MATCH, FE_N_ARM,
+    FE_N_RETURN, FE_N_BREAK, FE_N_CONTINUE, FE_N_DEFER, FE_N_UNSAFE, FE_N_ASM,
+    FE_N_TYPE, FE_N_EXPR, FE_N_BINARY, FE_N_UNARY, FE_N_CALL, FE_N_INDEX, FE_N_MEMBER,
+    FE_N_LITERAL, FE_N_IDENT, FE_N_STRUCT_INIT, FE_N_ERROR_NODE
+} FeNodeKind;
+
+typedef struct FeNode FeNode;
+struct FeNode {
+    FeNodeKind kind;
+    FeLoc loc;
+    char *text;
+    FeNode *a;
+    FeNode *b;
+    FeNode *c;
+    FeNode *children;
+    FeNode *next;
+};
+
+typedef struct FeAst {
+    FeArena arena;
+    FeNode *root;
+} FeAst;
+
+void fe_ast_init(FeAst *a);
+void fe_ast_destroy(FeAst *a);
+FeNode *fe_node(FeAst *a, FeNodeKind k, FeLoc loc, const char *text, unsigned long len);
+void fe_node_add(FeNode *parent, FeNode *child);
+void fe_ast_dump(const FeNode *n, int indent, FILE *out);
+const char *fe_node_name(FeNodeKind k);
+
+#endif