/* Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002, 2006, 2008, 2009, 2010 Free Software Foundation * * 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 #include "libguile/_scm.h" #include "libguile/async.h" #include "libguile/smob.h" #include "libguile/alist.h" #include "libguile/debug.h" #include "libguile/hashtab.h" #include "libguile/hash.h" #include "libguile/ports.h" #include "libguile/root.h" #include "libguile/weaks.h" #include "libguile/gc.h" #include "libguile/validate.h" #include "libguile/srcprop.h" /* {Source Properties} * * Properties of source list expressions. * Four of these have special meaning: * * filename string The name of the source file. * copy list A copy of the list expression. * line integer The source code line number. * column integer The source code column number. * * Most properties above can be set by the reader. * */ SCM_GLOBAL_SYMBOL (scm_sym_filename, "filename"); SCM_GLOBAL_SYMBOL (scm_sym_copy, "copy"); SCM_GLOBAL_SYMBOL (scm_sym_line, "line"); SCM_GLOBAL_SYMBOL (scm_sym_column, "column"); SCM scm_source_whash; /* * Source properties are stored as double cells with the * following layout: * car = tag * cbr = pos * ccr = copy * cdr = alist */ #define SRCPROPSP(p) (SCM_SMOB_PREDICATE (scm_tc16_srcprops, (p))) #define SRCPROPPOS(p) (SCM_SMOB_DATA(p)) #define SRCPROPLINE(p) (SRCPROPPOS(p) >> 12) #define SRCPROPCOL(p) (SRCPROPPOS(p) & 0x0fffL) #define SRCPROPCOPY(p) (SCM_SMOB_OBJECT_2(p)) #define SRCPROPALIST(p) (SCM_SMOB_OBJECT_3(p)) #define SRCPROPMAKPOS(l, c) (((l) << 12) + (c)) #define SETSRCPROPPOS(p, l, c) (SCM_SET_SMOB_DATA_1 (p, SRCPROPMAKPOS (l, c))) #define SETSRCPROPLINE(p, l) SETSRCPROPPOS (p, l, SRCPROPCOL (p)) #define SETSRCPROPCOL(p, c) SETSRCPROPPOS (p, SRCPROPLINE (p), c) #define SETSRCPROPCOPY(p, c) (SCM_SET_SMOB_OBJECT_2 (p, c)) #define SETSRCPROPALIST(p, l) (SCM_SET_SMOB_OBJECT_3 (p, l)) static SCM scm_srcprops_to_alist (SCM obj); scm_t_bits scm_tc16_srcprops; static int srcprops_print (SCM obj, SCM port, scm_print_state *pstate) { int writingp = SCM_WRITINGP (pstate); scm_puts ("#', port); return 1; } /* * We remember the last file name settings, so we can share that alist * entry. This works because scm_set_source_property_x does not use * assoc-set! for modifying the alist. * * This variable contains a protected cons, whose cdr is the cached * alist */ static SCM scm_last_alist_filename; SCM scm_make_srcprops (long line, int col, SCM filename, SCM copy, SCM alist) { if (!SCM_UNBNDP (filename)) { SCM old_alist = alist; /* have to extract the acons, and operate on that, for thread safety. */ SCM last_acons = SCM_CDR (scm_last_alist_filename); if (old_alist == SCM_EOL && SCM_CDAR (last_acons) == filename) { alist = last_acons; } else { alist = scm_acons (scm_sym_filename, filename, alist); if (old_alist == SCM_EOL) SCM_SETCDR (scm_last_alist_filename, alist); } } SCM_RETURN_NEWSMOB3 (scm_tc16_srcprops, SRCPROPMAKPOS (line, col), copy, alist); } static SCM scm_srcprops_to_alist (SCM obj) { SCM alist = SRCPROPALIST (obj); if (!SCM_UNBNDP (SRCPROPCOPY (obj))) alist = scm_acons (scm_sym_copy, SRCPROPCOPY (obj), alist); alist = scm_acons (scm_sym_column, scm_from_int (SRCPROPCOL (obj)), alist); alist = scm_acons (scm_sym_line, scm_from_int (SRCPROPLINE (obj)), alist); return alist; } SCM_DEFINE (scm_source_properties, "source-properties", 1, 0, 0, (SCM obj), "Return the source property association list of @var{obj}.") #define FUNC_NAME s_scm_source_properties { SCM p; SCM_VALIDATE_NIM (1, obj); p = scm_hashq_ref (scm_source_whash, obj, SCM_EOL); if (SRCPROPSP (p)) return scm_srcprops_to_alist (p); else /* list from set-source-properties!, or SCM_EOL for not found */ return p; } #undef FUNC_NAME /* Perhaps this procedure should look through an alist and try to make a srcprops-object...? */ SCM_DEFINE (scm_set_source_properties_x, "set-source-properties!", 2, 0, 0, (SCM obj, SCM alist), "Install the association list @var{alist} as the source property\n" "list for @var{obj}.") #define FUNC_NAME s_scm_set_source_properties_x { SCM handle; SCM_VALIDATE_NIM (1, obj); handle = scm_hashq_create_handle_x (scm_source_whash, obj, alist); SCM_SETCDR (handle, alist); return alist; } #undef FUNC_NAME SCM_DEFINE (scm_source_property, "source-property", 2, 0, 0, (SCM obj, SCM key), "Return the source property specified by @var{key} from\n" "@var{obj}'s source property list.") #define FUNC_NAME s_scm_source_property { SCM p; SCM_VALIDATE_NIM (1, obj); p = scm_hashq_ref (scm_source_whash, obj, SCM_EOL); if (!SRCPROPSP (p)) goto alist; if (scm_is_eq (scm_sym_line, key)) p = scm_from_int (SRCPROPLINE (p)); else if (scm_is_eq (scm_sym_column, key)) p = scm_from_int (SRCPROPCOL (p)); else if (scm_is_eq (scm_sym_copy, key)) p = SRCPROPCOPY (p); else { p = SRCPROPALIST (p); alist: p = scm_assoc (key, p); return (SCM_NIMP (p) ? SCM_CDR (p) : SCM_BOOL_F); } return SCM_UNBNDP (p) ? SCM_BOOL_F : p; } #undef FUNC_NAME SCM_DEFINE (scm_set_source_property_x, "set-source-property!", 3, 0, 0, (SCM obj, SCM key, SCM datum), "Set the source property of object @var{obj}, which is specified by\n" "@var{key} to @var{datum}. Normally, the key will be a symbol.") #define FUNC_NAME s_scm_set_source_property_x { scm_whash_handle h; SCM p; SCM_VALIDATE_NIM (1, obj); h = scm_whash_get_handle (scm_source_whash, obj); if (SCM_WHASHFOUNDP (h)) p = SCM_WHASHREF (scm_source_whash, h); else { h = scm_whash_create_handle (scm_source_whash, obj); p = SCM_EOL; } if (scm_is_eq (scm_sym_line, key)) { if (SRCPROPSP (p)) SETSRCPROPLINE (p, scm_to_int (datum)); else SCM_WHASHSET (scm_source_whash, h, scm_make_srcprops (scm_to_int (datum), 0, SCM_UNDEFINED, SCM_UNDEFINED, p)); } else if (scm_is_eq (scm_sym_column, key)) { if (SRCPROPSP (p)) SETSRCPROPCOL (p, scm_to_int (datum)); else SCM_WHASHSET (scm_source_whash, h, scm_make_srcprops (0, scm_to_int (datum), SCM_UNDEFINED, SCM_UNDEFINED, p)); } else if (scm_is_eq (scm_sym_copy, key)) { if (SRCPROPSP (p)) SETSRCPROPCOPY (p, datum); else SCM_WHASHSET (scm_source_whash, h, scm_make_srcprops (0, 0, SCM_UNDEFINED, datum, p)); } else { if (SRCPROPSP (p)) SETSRCPROPALIST (p, scm_acons (key, datum, SRCPROPALIST (p))); else SCM_WHASHSET (scm_source_whash, h, scm_acons (key, datum, p)); } return SCM_UNSPECIFIED; } #undef FUNC_NAME SCM_DEFINE (scm_cons_source, "cons-source", 3, 0, 0, (SCM xorig, SCM x, SCM y), "Create and return a new pair whose car and cdr are @var{x} and @var{y}.\n" "Any source properties associated with @var{xorig} are also associated\n" "with the new pair.") #define FUNC_NAME s_scm_cons_source { SCM p, z; z = scm_cons (x, y); /* Copy source properties possibly associated with xorig. */ p = scm_whash_lookup (scm_source_whash, xorig); if (scm_is_true (p)) scm_whash_insert (scm_source_whash, z, p); return z; } #undef FUNC_NAME void scm_init_srcprop () { scm_tc16_srcprops = scm_make_smob_type ("srcprops", 0); scm_set_smob_print (scm_tc16_srcprops, srcprops_print); scm_source_whash = scm_make_weak_key_hash_table (scm_from_int (2047)); scm_c_define ("source-whash", scm_source_whash); scm_last_alist_filename = scm_cons (SCM_EOL, scm_acons (SCM_EOL, SCM_EOL, SCM_EOL)); #include "libguile/srcprop.x" } /* Local Variables: c-file-style: "gnu" End: */