--- /dev/null
+/* Copyright (C) 1995,1996,1997,1998,2000,2001,2002,2003, 2006, 2008 Free Software Foundation, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+\f
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "libguile/_scm.h"
+#include "libguile/alist.h" /* for SCM_EXTEND_ENV (well...) */
+#include "libguile/eval.h"
+#include "libguile/ports.h"
+#include "libguile/print.h"
+#include "libguile/root.h"
+#include "libguile/smob.h"
+#include "libguile/deprecation.h"
+
+#include "libguile/validate.h"
+#include "libguile/macros.h"
+
+scm_t_bits scm_tc16_macro;
+
+
+static int
+macro_print (SCM macro, SCM port, scm_print_state *pstate)
+{
+ SCM code = SCM_MACRO_CODE (macro);
+ if (!SCM_CLOSUREP (code)
+ || scm_is_false (scm_procedure_p (SCM_PRINT_CLOSURE))
+ || scm_is_false (scm_printer_apply (SCM_PRINT_CLOSURE,
+ macro, port, pstate)))
+ {
+ if (!SCM_CLOSUREP (code))
+ scm_puts ("#<primitive-", port);
+ else
+ scm_puts ("#<", port);
+
+ if (SCM_MACRO_TYPE (macro) == 0)
+ scm_puts ("syntax", port);
+#if SCM_ENABLE_DEPRECATED == 1
+ if (SCM_MACRO_TYPE (macro) == 1)
+ scm_puts ("macro", port);
+#endif
+ if (SCM_MACRO_TYPE (macro) == 2)
+ scm_puts ("macro!", port);
+ if (SCM_MACRO_TYPE (macro) == 3)
+ scm_puts ("builtin-macro!", port);
+
+ scm_putc (' ', port);
+ scm_iprin1 (scm_macro_name (macro), port, pstate);
+
+ if (SCM_CLOSUREP (code) && SCM_PRINT_SOURCE_P)
+ {
+ SCM formals = SCM_CLOSURE_FORMALS (code);
+ SCM env = SCM_ENV (code);
+ SCM xenv = SCM_EXTEND_ENV (formals, SCM_EOL, env);
+ SCM src = scm_i_unmemocopy_body (SCM_CODE (code), xenv);
+ scm_putc (' ', port);
+ scm_iprin1 (src, port, pstate);
+ }
+
+ scm_putc ('>', port);
+ }
+
+ return 1;
+}
+
+static SCM
+makmac (SCM code, scm_t_bits flags)
+{
+ SCM z;
+ SCM_NEWSMOB (z, scm_tc16_macro, SCM_UNPACK (code));
+ SCM_SET_SMOB_FLAGS (z, flags);
+ return z;
+}
+
+/* Return a mmacro that is known to be one of guile's built in macros. */
+SCM
+scm_i_makbimacro (SCM code)
+#define FUNC_NAME "scm_i_makbimacro"
+{
+ SCM_VALIDATE_PROC (1, code);
+ return makmac (code, 3);
+}
+#undef FUNC_NAME
+
+
+SCM_DEFINE (scm_makmmacro, "procedure->memoizing-macro", 1, 0, 0,
+ (SCM code),
+ "Return a @dfn{macro} which, when a symbol defined to this value\n"
+ "appears as the first symbol in an expression, evaluates the\n"
+ "result of applying @var{code} to the expression and the\n"
+ "environment.\n\n"
+ "@code{procedure->memoizing-macro} is the same as\n"
+ "@code{procedure->macro}, except that the expression returned by\n"
+ "@var{code} replaces the original macro expression in the memoized\n"
+ "form of the containing code.")
+#define FUNC_NAME s_scm_makmmacro
+{
+ SCM_VALIDATE_PROC (1, code);
+ return makmac (code, 2);
+}
+#undef FUNC_NAME
+
+
+SCM_DEFINE (scm_makacro, "procedure->syntax", 1, 0, 0,
+ (SCM code),
+ "Return a @dfn{macro} which, when a symbol defined to this value\n"
+ "appears as the first symbol in an expression, returns the\n"
+ "result of applying @var{code} to the expression and the\n"
+ "environment.")
+#define FUNC_NAME s_scm_makacro
+{
+ SCM_VALIDATE_PROC (1, code);
+ return makmac (code, 0);
+}
+#undef FUNC_NAME
+
+
+#if SCM_ENABLE_DEPRECATED == 1
+
+SCM_DEFINE (scm_makmacro, "procedure->macro", 1, 0, 0,
+ (SCM code),
+ "Return a @dfn{macro} which, when a symbol defined to this value\n"
+ "appears as the first symbol in an expression, evaluates the\n"
+ "result of applying @var{code} to the expression and the\n"
+ "environment. For example:\n"
+ "\n"
+ "@lisp\n"
+ "(define trace\n"
+ " (procedure->macro\n"
+ " (lambda (x env) `(set! ,(cadr x) (tracef ,(cadr x) ',(cadr x))))))\n\n"
+ "(trace @i{foo}) @equiv{} (set! @i{foo} (tracef @i{foo} '@i{foo})).\n"
+ "@end lisp")
+#define FUNC_NAME s_scm_makmacro
+{
+ scm_c_issue_deprecation_warning
+ ("The function procedure->macro is deprecated, and so are"
+ " non-memoizing macros in general. Use memoizing macros"
+ " or r5rs macros instead.");
+
+ SCM_VALIDATE_PROC (1, code);
+ return makmac (code, 1);
+}
+#undef FUNC_NAME
+
+#endif
+
+
+SCM_DEFINE (scm_macro_p, "macro?", 1, 0, 0,
+ (SCM obj),
+ "Return @code{#t} if @var{obj} is a regular macro, a memoizing macro or a\n"
+ "syntax transformer.")
+#define FUNC_NAME s_scm_macro_p
+{
+ return scm_from_bool (SCM_SMOB_PREDICATE (scm_tc16_macro, obj));
+}
+#undef FUNC_NAME
+
+
+SCM_SYMBOL (scm_sym_syntax, "syntax");
+#if SCM_ENABLE_DEPRECATED == 1
+SCM_SYMBOL (scm_sym_macro, "macro");
+#endif
+SCM_SYMBOL (scm_sym_mmacro, "macro!");
+SCM_SYMBOL (scm_sym_bimacro, "builtin-macro!");
+
+SCM_DEFINE (scm_macro_type, "macro-type", 1, 0, 0,
+ (SCM m),
+ "Return one of the symbols @code{syntax}, @code{macro} or\n"
+ "@code{macro!}, depending on whether @var{m} is a syntax\n"
+ "transformer, a regular macro, or a memoizing macro,\n"
+ "respectively. If @var{m} is not a macro, @code{#f} is\n"
+ "returned.")
+#define FUNC_NAME s_scm_macro_type
+{
+ if (!SCM_SMOB_PREDICATE (scm_tc16_macro, m))
+ return SCM_BOOL_F;
+ switch (SCM_MACRO_TYPE (m))
+ {
+ case 0: return scm_sym_syntax;
+#if SCM_ENABLE_DEPRECATED == 1
+ case 1: return scm_sym_macro;
+#endif
+ case 2: return scm_sym_mmacro;
+ case 3: return scm_sym_bimacro;
+ default: scm_wrong_type_arg (FUNC_NAME, 1, m);
+ }
+}
+#undef FUNC_NAME
+
+
+SCM_DEFINE (scm_macro_name, "macro-name", 1, 0, 0,
+ (SCM m),
+ "Return the name of the macro @var{m}.")
+#define FUNC_NAME s_scm_macro_name
+{
+ SCM_VALIDATE_SMOB (1, m, macro);
+ return scm_procedure_name (SCM_PACK (SCM_SMOB_DATA (m)));
+}
+#undef FUNC_NAME
+
+
+SCM_DEFINE (scm_macro_transformer, "macro-transformer", 1, 0, 0,
+ (SCM m),
+ "Return the transformer of the macro @var{m}.")
+#define FUNC_NAME s_scm_macro_transformer
+{
+ SCM_VALIDATE_SMOB (1, m, macro);
+ return ((SCM_CLOSUREP (SCM_PACK (SCM_SMOB_DATA (m)))) ?
+ SCM_PACK(SCM_SMOB_DATA (m)) : SCM_BOOL_F);
+}
+#undef FUNC_NAME
+
+SCM
+scm_make_synt (const char *name, SCM (*macroizer) (), SCM (*fcn)() )
+{
+ SCM var = scm_c_define (name, SCM_UNDEFINED);
+ SCM transformer = scm_c_make_subr (name, scm_tc7_subr_2, fcn);
+ SCM_VARIABLE_SET (var, macroizer (transformer));
+ return SCM_UNSPECIFIED;
+}
+
+void
+scm_init_macros ()
+{
+ scm_tc16_macro = scm_make_smob_type ("macro", 0);
+ scm_set_smob_mark (scm_tc16_macro, scm_markcdr);
+ scm_set_smob_print (scm_tc16_macro, macro_print);
+#include "libguile/macros.x"
+}
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
projects / lilypond.git / blobdiff