/* Copyright (C) 1995,1996,1997,1999,2000,2001, 2006, 2008, 2009 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 3 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 */ #ifdef HAVE_CONFIG_H # include #endif #include "libguile/_scm.h" #include "libguile/strings.h" #include "libguile/vectors.h" #include "libguile/smob.h" #include "libguile/deprecation.h" #include "libguile/validate.h" #include "libguile/procs.h" #include "libguile/procprop.h" #include "libguile/objcodes.h" #include "libguile/programs.h" /* {Procedures} */ SCM scm_c_make_subr (const char *name, long type, SCM (*fcn) ()) { register SCM z; SCM sname; SCM *meta_info; meta_info = scm_gc_malloc (2 * sizeof (*meta_info), "subr meta-info"); sname = scm_from_locale_symbol (name); meta_info[0] = sname; meta_info[1] = SCM_EOL; /* properties */ z = scm_double_cell ((scm_t_bits) type, (scm_t_bits) fcn, 0 /* generic */, (scm_t_bits) meta_info); scm_remember_upto_here_1 (sname); return z; } SCM scm_c_define_subr (const char *name, long type, SCM (*fcn) ()) { SCM subr = scm_c_make_subr (name, type, fcn); scm_define (SCM_SUBR_NAME (subr), subr); return subr; } SCM scm_c_make_subr_with_generic (const char *name, long type, SCM (*fcn) (), SCM *gf) { SCM subr = scm_c_make_subr (name, type, fcn); SCM_SET_SUBR_GENERIC_LOC (subr, gf); return subr; } SCM scm_c_define_subr_with_generic (const char *name, long type, SCM (*fcn) (), SCM *gf) { SCM subr = scm_c_make_subr_with_generic (name, type, fcn, gf); scm_define (SCM_SUBR_NAME (subr), subr); return subr; } SCM_DEFINE (scm_procedure_p, "procedure?", 1, 0, 0, (SCM obj), "Return @code{#t} if @var{obj} is a procedure.") #define FUNC_NAME s_scm_procedure_p { if (SCM_NIMP (obj)) switch (SCM_TYP7 (obj)) { case scm_tcs_struct: if (!((SCM_OBJ_CLASS_FLAGS (obj) & SCM_CLASSF_PURE_GENERIC) || SCM_STRUCT_APPLICABLE_P (obj))) break; case scm_tcs_closures: case scm_tcs_subrs: case scm_tc7_pws: case scm_tc7_program: return SCM_BOOL_T; case scm_tc7_smob: return scm_from_bool (SCM_SMOB_DESCRIPTOR (obj).apply); default: return SCM_BOOL_F; } return SCM_BOOL_F; } #undef FUNC_NAME SCM_DEFINE (scm_closure_p, "closure?", 1, 0, 0, (SCM obj), "Return @code{#t} if @var{obj} is a closure.") #define FUNC_NAME s_scm_closure_p { return scm_from_bool (SCM_CLOSUREP (obj)); } #undef FUNC_NAME SCM_DEFINE (scm_thunk_p, "thunk?", 1, 0, 0, (SCM obj), "Return @code{#t} if @var{obj} is a thunk.") #define FUNC_NAME s_scm_thunk_p { if (SCM_NIMP (obj)) { again: switch (SCM_TYP7 (obj)) { case scm_tcs_closures: return scm_from_bool (SCM_CLOSURE_NUM_REQUIRED_ARGS (obj) == 0); case scm_tc7_subr_0: case scm_tc7_subr_1o: case scm_tc7_lsubr: case scm_tc7_rpsubr: case scm_tc7_asubr: return SCM_BOOL_T; case scm_tc7_gsubr: return scm_from_bool (SCM_GSUBR_REQ (SCM_GSUBR_TYPE (obj)) == 0); case scm_tc7_program: { int a, o, r; if (scm_i_program_arity (obj, &a, &o, &r)) return scm_from_bool (a == 0); else return SCM_BOOL_F; } case scm_tc7_pws: obj = SCM_PROCEDURE (obj); goto again; default: return SCM_BOOL_F; } } return SCM_BOOL_F; } #undef FUNC_NAME /* Only used internally. */ int scm_subr_p (SCM obj) { if (SCM_NIMP (obj)) switch (SCM_TYP7 (obj)) { case scm_tcs_subrs: return 1; default: ; } return 0; } SCM_SYMBOL (sym_documentation, "documentation"); SCM_DEFINE (scm_procedure_documentation, "procedure-documentation", 1, 0, 0, (SCM proc), "Return the documentation string associated with @code{proc}. By\n" "convention, if a procedure contains more than one expression and the\n" "first expression is a string constant, that string is assumed to contain\n" "documentation for that procedure.") #define FUNC_NAME s_scm_procedure_documentation { SCM code; SCM_ASSERT (scm_is_true (scm_procedure_p (proc)), proc, SCM_ARG1, FUNC_NAME); if (SCM_PROGRAM_P (proc)) return scm_assq_ref (scm_program_properties (proc), sym_documentation); switch (SCM_TYP7 (proc)) { case scm_tcs_closures: code = SCM_CLOSURE_BODY (proc); if (scm_is_null (SCM_CDR (code))) return SCM_BOOL_F; code = SCM_CAR (code); if (scm_is_string (code)) return code; else return SCM_BOOL_F; default: return SCM_BOOL_F; } } #undef FUNC_NAME /* Procedure-with-setter */ SCM_DEFINE (scm_procedure_with_setter_p, "procedure-with-setter?", 1, 0, 0, (SCM obj), "Return @code{#t} if @var{obj} is a procedure with an\n" "associated setter procedure.") #define FUNC_NAME s_scm_procedure_with_setter_p { return scm_from_bool(SCM_PROCEDURE_WITH_SETTER_P (obj)); } #undef FUNC_NAME SCM_DEFINE (scm_make_procedure_with_setter, "make-procedure-with-setter", 2, 0, 0, (SCM procedure, SCM setter), "Create a new procedure which behaves like @var{procedure}, but\n" "with the associated setter @var{setter}.") #define FUNC_NAME s_scm_make_procedure_with_setter { SCM name, ret; SCM_VALIDATE_PROC (1, procedure); SCM_VALIDATE_PROC (2, setter); ret = scm_double_cell (scm_tc7_pws, SCM_UNPACK (procedure), SCM_UNPACK (setter), 0); /* don't use procedure_name, because don't care enough to do a reverse lookup */ switch (SCM_TYP7 (procedure)) { case scm_tcs_subrs: name = SCM_SUBR_NAME (procedure); break; default: name = scm_procedure_property (procedure, scm_sym_name); break; } if (scm_is_true (name)) scm_set_procedure_property_x (ret, scm_sym_name, name); return ret; } #undef FUNC_NAME SCM_DEFINE (scm_procedure, "procedure", 1, 0, 0, (SCM proc), "Return the procedure of @var{proc}, which must be either a\n" "procedure with setter, or an applicable struct.") #define FUNC_NAME s_scm_procedure { SCM_VALIDATE_NIM (1, proc); if (SCM_PROCEDURE_WITH_SETTER_P (proc)) return SCM_PROCEDURE (proc); else if (SCM_STRUCTP (proc)) { SCM_ASSERT (SCM_PUREGENERICP (proc) || SCM_STRUCT_APPLICABLE_P (proc), proc, SCM_ARG1, FUNC_NAME); return proc; } SCM_WRONG_TYPE_ARG (1, proc); return SCM_BOOL_F; /* not reached */ } #undef FUNC_NAME SCM_GPROC (s_setter, "setter", 1, 0, 0, scm_setter, g_setter); SCM scm_setter (SCM proc) { SCM_GASSERT1 (SCM_NIMP (proc), g_setter, proc, SCM_ARG1, s_setter); if (SCM_PROCEDURE_WITH_SETTER_P (proc)) return SCM_SETTER (proc); else if (SCM_STRUCTP (proc)) { SCM setter = SCM_BOOL_F; if (SCM_PUREGENERICP (proc)) setter = SCM_GENERIC_SETTER (proc); else if (SCM_STRUCT_SETTER_P (proc)) setter = SCM_STRUCT_SETTER (proc); if (SCM_NIMP (setter)) return setter; /* fall through */ } SCM_WTA_DISPATCH_1 (g_setter, proc, SCM_ARG1, s_setter); return SCM_BOOL_F; /* not reached */ } void scm_init_procs () { #include "libguile/procs.x" } /* Local Variables: c-file-style: "gnu" End: */