Initial upload

token.h

@@ -0,0 +1,52 @@
+/* vim: set filetype=c: */
+
+#ifndef _TOKEN_H_
+#define _TOKEN_H_
+
+#include <stdio.h>
+
+typedef struct Token Token;
+struct Token;
+typedef struct TokenListItem TokenListItem;
+struct TokenListItem;
+
+typedef long double NumToken;
+typedef struct SepToken SepToken;
+struct SepToken {
+    char sym;
+    TokenListItem* matching;
+};
+typedef char OpToken;
+typedef struct ExprToken ExprToken;
+struct ExprToken {
+    Token* lhs;
+    Token* op;
+    Token* rhs;
+};
+
+typedef struct Token Token;
+struct Token {
+    enum {
+        TokenTypeNull, /* Invalid type */
+        TokenTypeNum,
+        TokenTypeSep,
+        TokenTypeOp,
+        TokenTypeExpr,
+    } type;
+
+    union {
+        NumToken num;
+        SepToken sep;
+        OpToken op;
+        ExprToken expr;
+    } data;
+};
+
+/* Recursively frees Token of type ExprToken and its children */
+extern void ExprToken_uninit_recursive(Token* obj);
+
+extern void Token_print(const Token* obj, FILE* file);
+
+extern void Token_print_as_tree(const Token* obj, FILE* file);
+
+#endif /* _TOKEN_H_ */