From d46183860c1f3f10095e95023adcb79b1896ab0e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@lysator.liu.se>
Date: Fri, 22 Mar 2019 20:11:11 +0100
Subject: Move C and Scheme code into subdirs.

---
 src/macro.h | 134 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 src/macro.h

(limited to 'src/macro.h')

diff --git a/src/macro.h b/src/macro.h
new file mode 100644
index 00000000..7b620f83
--- /dev/null
+++ b/src/macro.h
@@ -0,0 +1,134 @@
+#ifndef MACRO_H
+#define MACRO_H
+
+/*
+ * Token paste
+ */
+#define TP(a, b) a ## b
+#define TP3(a, b, c) a ## b ## c
+#define TP4(a, b, c, d) a ## b ## c ## d
+#define TP5(a, b, c, d, e) a ## b ## c ## d ## e
+#define TP6(a, b, c, d, e, f) a ## b ## c ## d ## e ## f
+
+/*
+ * Get length of __VA_ARGS__
+ * Borrowed fram:
+ * https://stackoverflow.com/a/35986932
+ */
+#define VA_ARGS_NUM_PRIV(P1, P2, P3, P4, P5, P6, Pn, ...) Pn
+#define VA_ARGS_NUM(...) VA_ARGS_NUM_PRIV(-1, ## __VA_ARGS__, 5, 4, 3, 2, 1, 0)
+
+/*
+ * Templatization macros. Forms symbols on the from name<T>, which
+ * looks really good in debuggers and the like. Unicode characters
+ * written in \U notation since C apparently doesn't support unicode
+ * literals.
+ *
+ * Can be nested (useful for container types).
+ *
+ * Doesn't use ASCII <>, but rather some other ᐸᐳ, meaning that it's
+ * not a reserved character.
+ *
+ * nameᐸTᐳ
+ */
+#define TEMPL(name, T)     TP4(name, \U00001438 , T, \U00001433 )
+#define TEMPL2(name, T, V) TP6(name, \U00001438\U00001438 , T , \U00001433_\U00001438 , V, \U00001433\U00001433)
+#define TEMPL_N(name, T, argcount) TP6(name, \U00001438 , T, _, argcount, \U00001433 )
+
+/* Constructor type name */
+#define __INIT_T(T, C) TEMPL_N(init, T, C)
+
+/* Returns full type of constructor */
+#define INIT_F(T, ...) \
+	int __INIT_T(T, VA_ARGS_NUM(__VA_ARGS__)) (T* self, ## __VA_ARGS__)
+
+/*
+ * Call the constructor of an object
+ * `int` part of the macro, to ensure that any attempt to call self
+ * function results in an error.
+ */
+#define INIT(T, N, ...) \
+	 __INIT_T(T, VA_ARGS_NUM(__VA_ARGS__)) (N, ## __VA_ARGS__)
+
+/* Allocate a new_ object on the HEAP */
+#define NEW(T, N, ...) \
+	T* N = (T*) malloc(sizeof(*N)); \
+	INIT(T, N, ## __VA_ARGS__);
+
+/*
+ * Reconstructs a object. Use with caution.
+ */
+#define RENEW(T, N, ...) do { \
+	N = (T*) malloc(sizeof(*N)); \
+	INIT(T, N, ## __VA_ARGS__); \
+} while (0)
+
+
+/* Allocate a new_ object on the STACK */
+#define SNEW(T, N, ...) \
+	T N; \
+	INIT(T, & N, ## __VA_ARGS__);
+
+/* Destructor for type */
+#define FREE(T) TEMPL(free, T)
+
+/*  Call destructor for type, and free object */
+#define FFREE(T, N) do { FREE(T)(N); free(N); } while (0)
+
+/* Declare destructor */
+#define FREE_F(T) int FREE(T) (T* self)
+
+/* generate reusable internal symbol */
+#define __INTER(s) TP3(__, s, __internal)
+#define __INTER2(s) __INTER(__INTER(s))
+#define __INTER3(s) __INTER(__INTER(__INTER(s)))
+
+/* Iterator macros.  */
+#define FOR(CONT_T, T, var, set) \
+	PRE_FOR_  ## CONT_T (T) (T, var, set); \
+	for( BEG_ ## CONT_T (T) (T, var, set); \
+		 END_ ## CONT_T (T) (T, var, set); \
+		 NXT_ ## CONT_T (T) (T, var, set))
+
+/* Example int implementation
+ * FOR(int, i, 10) { } */
+
+#define PRE_FOR_int(i, set)
+#define BEG_int(i, set) int i = 0
+#define NXT_int(i, set) i++
+#define END_int(i, set) i < set
+
+/*
+ * General functions that different container types may implement.
+ * Actuall implementation and type signature is mostly left to
+ * individual implementations.
+ */
+#define DEEP_COPY(T) TEMPL(copy      , T)
+#define RESOLVE(T)   TEMPL(resolve   , T)
+#define APPEND(T)    TEMPL(append    , T)
+#define SIZE(T)      TEMPL(size      , T)
+#define EMPTY(T)     TEMPL(empty     , T)
+#define PUSH(T)      TEMPL(push      , T)
+#define PEEK(T)      TEMPL(peek      , T)
+#define POP(T)       TEMPL(pop       , T)
+#define GET(T)       TEMPL(get       , T)
+#define RESET(T)     TEMPL(reset     , T)
+#define KEYS(T)      TEMPL(keys      , T)
+
+/*
+ * Formatting macros.
+ * Transform objects into string representation of themselves. 
+ * buf should be a suffisiently large memmory location, if it's to
+ * small then bad stuff might happen.
+ *
+ * Should return the number of bytes written (like sprintf).
+ */
+
+#define FMT_T(T)     TEMPL(format    , T)
+#define FMT_F(T) int FMT_T(T)(T* self, char* buf, ...)
+// TODO change order of buf and item
+#define __FMT_HELP(item, buf, ...) ((item), (buf), VA_ARGS_NUM(__VA_ARGS__), ## __VA_ARGS__)
+#define FMT(T) FMT_T(T) __FMT_HELP
+#define fmtf(...) seek += sprintf(buf + seek, __VA_ARGS__)
+
+#endif /* MACRO_H */
-- 
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