From e2dfdd7d07f54b464a4419dcf102662f1694d4b8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20Ankarstr=C3=B6m?= <john@ankarstrom.se>
Date: Fri, 15 Jul 2022 18:50:15 +0200
Subject: Split defs.h into separate header files.

This is feasible now that the makedeps script exists to automatically
manage build dependencies (see 6034fe2, d00f8b3).
---
 c/pl.h | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 c/pl.h

(limited to 'c/pl.h')

diff --git a/c/pl.h b/c/pl.h
new file mode 100644
index 0000000..f0edfb8
--- /dev/null
+++ b/c/pl.h
@@ -0,0 +1,92 @@
+#ifndef PL_H
+#define PL_H
+
+#include <SWI-Prolog.h>
+
+int Plx(const char *, const char *);
+struct Query
+{
+	Query(module_t ctx, predicate_t p, term_t t0);
+	~Query(void);
+	int Cut();
+	int Close();
+	int NextSolution();
+private:
+	qid_t m_q;
+};
+
+#define DLVSIKEY 0
+#define DLVSIVALUE 1
+
+/* Polymorphic aliases for PL_put_*, PL_get_*. */
+inline int PlPut(term_t t, int x) { return PL_put_integer(t, x); }
+inline int PlPut(term_t t, long x) { return PL_put_integer(t, x); }
+inline int PlPut(term_t t, long long x) { return PL_put_integer(t, x); }
+inline int PlPut(term_t t, atom_t x) { return PL_put_atom(t, x); }
+inline int PlPut(term_t t, char *x) { return PL_put_atom(t, PL_new_atom(x)); }
+inline int PlPut(term_t t, const char *x) { return PL_put_atom(t, PL_new_atom(x)); }
+inline int PlPut(term_t t, int *x) { return -1; }
+inline int PlPut(term_t t, long *x) { return -1; }
+inline int PlPut(term_t t, long long *x) { return -1; }
+inline int PlPut(term_t t, atom_t *x) { return -1; }
+inline int PlPut(term_t t, char **x) { return -1; }
+
+inline int PlGet(term_t t, int x) { return -1; }
+inline int PlGet(term_t t, long x) { return -1; }
+inline int PlGet(term_t t, long long x) { return -1; }
+inline int PlGet(term_t t, atom_t x) { return -1; }
+inline int PlGet(term_t t, char *x) { return -1; }
+inline int PlGet(term_t t, const char *x) { return -1; }
+inline int PlGet(term_t t, int *x) { return PL_get_integer(t, x); }
+inline int PlGet(term_t t, long *x) { return PL_get_long(t, x); }
+inline int PlGet(term_t t, long long *x) { return PL_get_int64(t, x); }
+inline int PlGet(term_t t, atom_t *x) { return PL_get_atom(t, x); }
+inline int PlGet(term_t t, char **x) { return PL_get_atom_chars(t, x); }
+
+/* Helper templates for Plx, Pl. */
+template <typename T>
+int PlPutv(term_t t, T arg) { return PlPut(t, arg); }
+template <typename T, typename ...R>
+int PlPutv(term_t t, T arg, R... rest) { return PlPut(t, arg)? PlPutv(t+1, rest...): 0; }
+template <typename T>
+int PlGetv(term_t t, T arg) { return PlGet(t, arg); }
+template <typename T, typename ...R>
+int PlGetv(term_t t, T arg, R... rest) { return PlGet(t, arg)? PlGetv(t+1, rest...): 0; }
+template <typename T>
+int Countv(int i, T arg) { return i+1; }
+template <typename T, typename ...R>
+int Countv(int i, T arg, R... rest) { return Countv(i+1, rest...); }
+
+/* Call Prolog predicate, propagating Prolog exceptions. */
+template <typename ...T>
+int Plx(const char *szMod, const char *szPred, T... args)
+{
+	int iArity = Countv(0, args...);
+	term_t t = PL_new_term_refs(iArity);
+	if (!PlPutv(t, args...)) return 0;
+	Query q(NULL, PL_predicate(szPred, iArity, szMod), t);
+	if (!q.NextSolution()) return 0;
+	if (!PlGetv(t, args...)) return 0;
+	return 1;
+}
+
+/* Call Prolog predicate, ignoring Prolog exceptions. */
+inline int Pl(const char *szMod, const char *szPred)
+{
+	try {
+		return Plx(szMod, szPred);
+	} catch (term_t &t) {
+		return 0;
+	}
+}
+template <typename ...T>
+int Pl(const char *szMod, const char *szPred, T... args)
+{
+	try {
+		return Plx(szMod, szPred, args...);
+	} catch (term_t &t) {
+		return 0;
+	}
+}
+
+#endif
-- 
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