1 files changed, 40 insertions, 0 deletions
diff --git a/ast.h b/ast.h
new file mode 100644
index 0000000..4694c33
--- /dev/null
+++ b/ast.h
@@ -0,0 +1,40 @@
+#ifndef AST_H
+#define AST_H
+
+struct repeat {
+	long min, max;
+};
+
+enum {
+	ATOM_ALTERNATION,
+	ATOM_SEQUENCE,
+	ATOM_REPETITION,
+	ATOM_ALPHABETIC,
+	ATOM_NUMERIC,
+	ATOM_UPPERCASE,
+	ATOM_LOWERCASE,
+	ATOM_CONTROL,
+	ATOM_PUNCTUATION,
+	ATOM_EVERYTHING,
+	ATOM_LITERAL,
+};
+
+struct atom {
+	int type;
+	union {
+		struct {
+			struct repeat counts;
+			struct atom *child;
+		} repeat;
+		const struct atom *children[2];
+		const char *literal;
+	} u;
+};
+
+struct atom *mkatom(const struct atom *src);
+void dump_atom(const struct atom *a);
+
+extern struct atom *ast;
+
+#endif
+