--- /dev/null
+/* Copyright (C) 1995-1999,2000,2001, 2002, 2003, 2004, 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 <errno.h>
+
+#include "libguile/_scm.h"
+#include "libguile/chars.h"
+#include "libguile/continuations.h"
+#include "libguile/smob.h"
+#include "libguile/eval.h"
+#include "libguile/macros.h"
+#include "libguile/procprop.h"
+#include "libguile/read.h"
+#include "libguile/weaks.h"
+#include "libguile/unif.h"
+#include "libguile/alist.h"
+#include "libguile/struct.h"
+#include "libguile/objects.h"
+#include "libguile/ports.h"
+#include "libguile/root.h"
+#include "libguile/strings.h"
+#include "libguile/strports.h"
+#include "libguile/vectors.h"
+#include "libguile/lang.h"
+#include "libguile/numbers.h"
+
+#include "libguile/validate.h"
+#include "libguile/print.h"
+\f
+
+/* {Names of immediate symbols}
+ *
+ * This table must agree with the declarations in scm.h: {Immediate Symbols}.
+ */
+
+/* This table must agree with the list of flags in tags.h. */
+static const char *iflagnames[] =
+{
+ "#f",
+ "#t",
+ "#<undefined>",
+ "#<eof>",
+ "()",
+ "#<unspecified>",
+
+ /* Unbound slot marker for GOOPS. For internal use in GOOPS only. */
+ "#<unbound>",
+
+ /* Elisp nil value. This is its Scheme name; whenever it's printed in
+ * Elisp, it should appear as the symbol `nil'. */
+ "#nil"
+};
+
+SCM_SYMBOL (sym_reader, "reader");
+
+scm_t_option scm_print_opts[] = {
+ { SCM_OPTION_SCM, "closure-hook", SCM_UNPACK (SCM_BOOL_F),
+ "Hook for printing closures (should handle macros as well)." },
+ { SCM_OPTION_BOOLEAN, "source", 0,
+ "Print closures with source." },
+ { SCM_OPTION_SCM, "highlight-prefix", (unsigned long)SCM_BOOL_F,
+ "The string to print before highlighted values." },
+ { SCM_OPTION_SCM, "highlight-suffix", (unsigned long)SCM_BOOL_F,
+ "The string to print after highlighted values." },
+ { SCM_OPTION_SCM, "quote-keywordish-symbols", (unsigned long)SCM_BOOL_F,
+ "How to print symbols that have a colon as their first or last character. "
+ "The value '#f' does not quote the colons; '#t' quotes them; "
+ "'reader' quotes them when the reader option 'keywords' is not '#f'."
+ }
+};
+
+SCM_DEFINE (scm_print_options, "print-options-interface", 0, 1, 0,
+ (SCM setting),
+ "Option interface for the print options. Instead of using\n"
+ "this procedure directly, use the procedures\n"
+ "@code{print-enable}, @code{print-disable}, @code{print-set!}\n"
+ "and @code{print-options}.")
+#define FUNC_NAME s_scm_print_options
+{
+ SCM ans = scm_options (setting,
+ scm_print_opts,
+ SCM_N_PRINT_OPTIONS,
+ FUNC_NAME);
+ return ans;
+}
+#undef FUNC_NAME
+
+\f
+/* {Printing of Scheme Objects}
+ */
+
+/* Detection of circular references.
+ *
+ * Due to other constraints in the implementation, this code has bad
+ * time complexity (O (depth * N)), The printer code can be
+ * rewritten to be O(N).
+ */
+#define PUSH_REF(pstate, obj) \
+do \
+{ \
+ PSTATE_STACK_SET (pstate, pstate->top, obj); \
+ pstate->top++; \
+ if (pstate->top == pstate->ceiling) \
+ grow_ref_stack (pstate); \
+} while(0)
+
+#define ENTER_NESTED_DATA(pstate, obj, label) \
+do \
+{ \
+ register unsigned long i; \
+ for (i = 0; i < pstate->top; ++i) \
+ if (scm_is_eq (PSTATE_STACK_REF (pstate, i), (obj))) \
+ goto label; \
+ if (pstate->fancyp) \
+ { \
+ if (pstate->top - pstate->list_offset >= pstate->level) \
+ { \
+ scm_putc ('#', port); \
+ return; \
+ } \
+ } \
+ PUSH_REF(pstate, obj); \
+} while(0)
+
+#define EXIT_NESTED_DATA(pstate) \
+do \
+{ \
+ --pstate->top; \
+ PSTATE_STACK_SET (pstate, pstate->top, SCM_UNDEFINED); \
+} \
+while (0)
+
+SCM scm_print_state_vtable = SCM_BOOL_F;
+static SCM print_state_pool = SCM_EOL;
+scm_i_pthread_mutex_t print_state_mutex = SCM_I_PTHREAD_MUTEX_INITIALIZER;
+
+#ifdef GUILE_DEBUG /* Used for debugging purposes */
+
+SCM_DEFINE (scm_current_pstate, "current-pstate", 0, 0, 0,
+ (),
+ "Return the current-pstate -- the car of the\n"
+ "@code{print_state_pool}. @code{current-pstate} is only\n"
+ "included in @code{--enable-guile-debug} builds.")
+#define FUNC_NAME s_scm_current_pstate
+{
+ if (!scm_is_null (print_state_pool))
+ return SCM_CAR (print_state_pool);
+ else
+ return SCM_BOOL_F;
+}
+#undef FUNC_NAME
+
+#endif
+
+#define PSTATE_SIZE 50L
+
+static SCM
+make_print_state (void)
+{
+ SCM print_state
+ = scm_make_struct (scm_print_state_vtable, SCM_INUM0, SCM_EOL);
+ scm_print_state *pstate = SCM_PRINT_STATE (print_state);
+ pstate->ref_vect = scm_c_make_vector (PSTATE_SIZE, SCM_UNDEFINED);
+ pstate->ceiling = SCM_SIMPLE_VECTOR_LENGTH (pstate->ref_vect);
+ pstate->highlight_objects = SCM_EOL;
+ return print_state;
+}
+
+SCM
+scm_make_print_state ()
+{
+ SCM answer = SCM_BOOL_F;
+
+ /* First try to allocate a print state from the pool */
+ scm_i_pthread_mutex_lock (&print_state_mutex);
+ if (!scm_is_null (print_state_pool))
+ {
+ answer = SCM_CAR (print_state_pool);
+ print_state_pool = SCM_CDR (print_state_pool);
+ }
+ scm_i_pthread_mutex_unlock (&print_state_mutex);
+
+ return scm_is_false (answer) ? make_print_state () : answer;
+}
+
+void
+scm_free_print_state (SCM print_state)
+{
+ SCM handle;
+ scm_print_state *pstate = SCM_PRINT_STATE (print_state);
+ /* Cleanup before returning print state to pool.
+ * It is better to do it here. Doing it in scm_prin1
+ * would cost more since that function is called much more
+ * often.
+ */
+ pstate->fancyp = 0;
+ pstate->revealed = 0;
+ pstate->highlight_objects = SCM_EOL;
+ scm_i_pthread_mutex_lock (&print_state_mutex);
+ handle = scm_cons (print_state, print_state_pool);
+ print_state_pool = handle;
+ scm_i_pthread_mutex_unlock (&print_state_mutex);
+}
+
+SCM
+scm_i_port_with_print_state (SCM port, SCM print_state)
+{
+ if (SCM_UNBNDP (print_state))
+ {
+ if (SCM_PORT_WITH_PS_P (port))
+ return port;
+ else
+ print_state = scm_make_print_state ();
+ /* port does not need to be coerced since it doesn't have ps */
+ }
+ else
+ port = SCM_COERCE_OUTPORT (port);
+ SCM_RETURN_NEWSMOB (scm_tc16_port_with_ps,
+ SCM_UNPACK (scm_cons (port, print_state)));
+}
+
+static void
+grow_ref_stack (scm_print_state *pstate)
+{
+ SCM old_vect = pstate->ref_vect;
+ size_t old_size = SCM_SIMPLE_VECTOR_LENGTH (old_vect);
+ size_t new_size = 2 * pstate->ceiling;
+ SCM new_vect = scm_c_make_vector (new_size, SCM_UNDEFINED);
+ unsigned long int i;
+
+ for (i = 0; i != old_size; ++i)
+ SCM_SIMPLE_VECTOR_SET (new_vect, i, SCM_SIMPLE_VECTOR_REF (old_vect, i));
+
+ pstate->ref_vect = new_vect;
+ pstate->ceiling = new_size;
+}
+
+#define PSTATE_STACK_REF(p,i) SCM_SIMPLE_VECTOR_REF((p)->ref_vect, (i))
+#define PSTATE_STACK_SET(p,i,v) SCM_SIMPLE_VECTOR_SET((p)->ref_vect, (i), (v))
+
+static void
+print_circref (SCM port, scm_print_state *pstate, SCM ref)
+{
+ register long i;
+ long self = pstate->top - 1;
+ i = pstate->top - 1;
+ if (scm_is_pair (PSTATE_STACK_REF (pstate, i)))
+ {
+ while (i > 0)
+ {
+ if (!scm_is_pair (PSTATE_STACK_REF (pstate, i-1))
+ || !scm_is_eq (SCM_CDR (PSTATE_STACK_REF (pstate, i-1)),
+ SCM_CDR (PSTATE_STACK_REF (pstate, i))))
+ break;
+ --i;
+ }
+ self = i;
+ }
+ for (i = pstate->top - 1; 1; --i)
+ if (scm_is_eq (PSTATE_STACK_REF(pstate, i), ref))
+ break;
+ scm_putc ('#', port);
+ scm_intprint (i - self, 10, port);
+ scm_putc ('#', port);
+}
+
+/* Print the name of a symbol. */
+
+static int
+quote_keywordish_symbol (const char *str, size_t len)
+{
+ SCM option;
+
+ /* LEN is guaranteed to be > 0.
+ */
+ if (str[0] != ':' && str[len-1] != ':')
+ return 0;
+
+ option = SCM_PRINT_KEYWORD_STYLE;
+ if (scm_is_false (option))
+ return 0;
+ if (scm_is_eq (option, sym_reader))
+ return scm_is_true (SCM_PACK (SCM_KEYWORD_STYLE));
+ return 1;
+}
+
+void
+scm_print_symbol_name (const char *str, size_t len, SCM port)
+{
+ /* This points to the first character that has not yet been written to the
+ * port. */
+ size_t pos = 0;
+ /* This points to the character we're currently looking at. */
+ size_t end;
+ /* If the name contains weird characters, we'll escape them with
+ * backslashes and set this flag; it indicates that we should surround the
+ * name with "#{" and "}#". */
+ int weird = 0;
+ /* Backslashes are not sufficient to make a name weird, but if a name is
+ * weird because of other characters, backslahes need to be escaped too.
+ * The first time we see a backslash, we set maybe_weird, and mw_pos points
+ * to the backslash. Then if the name turns out to be weird, we re-process
+ * everything starting from mw_pos.
+ * We could instead make backslashes always weird. This is not necessary
+ * to ensure that the output is (read)-able, but it would make this code
+ * simpler and faster. */
+ int maybe_weird = 0;
+ size_t mw_pos = 0;
+
+ if (len == 0 || str[0] == '\'' || str[0] == '`' || str[0] == ','
+ || quote_keywordish_symbol (str, len)
+ || (str[0] == '.' && len == 1)
+ || scm_is_true (scm_c_locale_stringn_to_number (str, len, 10)))
+ {
+ scm_lfwrite ("#{", 2, port);
+ weird = 1;
+ }
+
+ for (end = pos; end < len; ++end)
+ switch (str[end])
+ {
+#ifdef BRACKETS_AS_PARENS
+ case '[':
+ case ']':
+#endif
+ case '(':
+ case ')':
+ case '"':
+ case ';':
+ case '#':
+ case SCM_WHITE_SPACES:
+ case SCM_LINE_INCREMENTORS:
+ weird_handler:
+ if (maybe_weird)
+ {
+ end = mw_pos;
+ maybe_weird = 0;
+ }
+ if (!weird)
+ {
+ scm_lfwrite ("#{", 2, port);
+ weird = 1;
+ }
+ if (pos < end)
+ scm_lfwrite (str + pos, end - pos, port);
+ {
+ char buf[2];
+ buf[0] = '\\';
+ buf[1] = str[end];
+ scm_lfwrite (buf, 2, port);
+ }
+ pos = end + 1;
+ break;
+ case '\\':
+ if (weird)
+ goto weird_handler;
+ if (!maybe_weird)
+ {
+ maybe_weird = 1;
+ mw_pos = pos;
+ }
+ break;
+ default:
+ break;
+ }
+ if (pos < end)
+ scm_lfwrite (str + pos, end - pos, port);
+ if (weird)
+ scm_lfwrite ("}#", 2, port);
+}
+
+/* Print generally. Handles both write and display according to PSTATE.
+ */
+SCM_GPROC(s_write, "write", 1, 1, 0, scm_write, g_write);
+SCM_GPROC(s_display, "display", 1, 1, 0, scm_display, g_display);
+
+static void iprin1 (SCM exp, SCM port, scm_print_state *pstate);
+
+void
+scm_iprin1 (SCM exp, SCM port, scm_print_state *pstate)
+{
+ if (pstate->fancyp
+ && scm_is_true (scm_memq (exp, pstate->highlight_objects)))
+ {
+ scm_display (SCM_PRINT_HIGHLIGHT_PREFIX, port);
+ iprin1 (exp, port, pstate);
+ scm_display (SCM_PRINT_HIGHLIGHT_SUFFIX, port);
+ }
+ else
+ iprin1 (exp, port, pstate);
+}
+
+static void
+iprin1 (SCM exp, SCM port, scm_print_state *pstate)
+{
+ switch (SCM_ITAG3 (exp))
+ {
+ case scm_tc3_closure:
+ case scm_tc3_tc7_1:
+ case scm_tc3_tc7_2:
+ /* These tc3 tags should never occur in an immediate value. They are
+ * only used in cell types of non-immediates, i. e. the value returned
+ * by SCM_CELL_TYPE (exp) can use these tags.
+ */
+ scm_ipruk ("immediate", exp, port);
+ break;
+ case scm_tc3_int_1:
+ case scm_tc3_int_2:
+ scm_intprint (SCM_I_INUM (exp), 10, port);
+ break;
+ case scm_tc3_imm24:
+ if (SCM_CHARP (exp))
+ {
+ long i = SCM_CHAR (exp);
+
+ if (SCM_WRITINGP (pstate))
+ {
+ scm_puts ("#\\", port);
+ if ((i >= 0) && (i <= ' ') && scm_charnames[i])
+ scm_puts (scm_charnames[i], port);
+#ifndef EBCDIC
+ else if (i == '\177')
+ scm_puts (scm_charnames[scm_n_charnames - 1], port);
+#endif
+ else if (i < 0 || i > '\177')
+ scm_intprint (i, 8, port);
+ else
+ scm_putc (i, port);
+ }
+ else
+ scm_putc (i, port);
+ }
+ else if (SCM_IFLAGP (exp)
+ && ((size_t) SCM_IFLAGNUM (exp) < (sizeof iflagnames / sizeof (char *))))
+ {
+ scm_puts (iflagnames [SCM_IFLAGNUM (exp)], port);
+ }
+ else if (SCM_ISYMP (exp))
+ {
+ scm_i_print_isym (exp, port);
+ }
+ else if (SCM_ILOCP (exp))
+ {
+ scm_i_print_iloc (exp, port);
+ }
+ else
+ {
+ /* unknown immediate value */
+ scm_ipruk ("immediate", exp, port);
+ }
+ break;
+ case scm_tc3_cons:
+ switch (SCM_TYP7 (exp))
+ {
+ case scm_tcs_struct:
+ {
+ ENTER_NESTED_DATA (pstate, exp, circref);
+ if (SCM_OBJ_CLASS_FLAGS (exp) & SCM_CLASSF_GOOPS)
+ {
+ SCM pwps, print = pstate->writingp ? g_write : g_display;
+ if (!print)
+ goto print_struct;
+ pwps = scm_i_port_with_print_state (port, pstate->handle);
+ pstate->revealed = 1;
+ scm_call_generic_2 (print, exp, pwps);
+ }
+ else
+ {
+ print_struct:
+ scm_print_struct (exp, port, pstate);
+ }
+ EXIT_NESTED_DATA (pstate);
+ }
+ break;
+ case scm_tcs_cons_imcar:
+ case scm_tcs_cons_nimcar:
+ ENTER_NESTED_DATA (pstate, exp, circref);
+ scm_iprlist ("(", exp, ')', port, pstate);
+ EXIT_NESTED_DATA (pstate);
+ break;
+ circref:
+ print_circref (port, pstate, exp);
+ break;
+ case scm_tcs_closures:
+ if (scm_is_false (scm_procedure_p (SCM_PRINT_CLOSURE))
+ || scm_is_false (scm_printer_apply (SCM_PRINT_CLOSURE,
+ exp, port, pstate)))
+ {
+ SCM formals = SCM_CLOSURE_FORMALS (exp);
+ scm_puts ("#<procedure", port);
+ scm_putc (' ', port);
+ scm_iprin1 (scm_procedure_name (exp), port, pstate);
+ scm_putc (' ', port);
+ if (SCM_PRINT_SOURCE_P)
+ {
+ SCM env = SCM_ENV (exp);
+ SCM xenv = SCM_EXTEND_ENV (formals, SCM_EOL, env);
+ SCM src = scm_i_unmemocopy_body (SCM_CODE (exp), xenv);
+ ENTER_NESTED_DATA (pstate, exp, circref);
+ scm_iprin1 (src, port, pstate);
+ EXIT_NESTED_DATA (pstate);
+ }
+ else
+ scm_iprin1 (formals, port, pstate);
+ scm_putc ('>', port);
+ }
+ break;
+ case scm_tc7_number:
+ switch SCM_TYP16 (exp) {
+ case scm_tc16_big:
+ scm_bigprint (exp, port, pstate);
+ break;
+ case scm_tc16_real:
+ scm_print_real (exp, port, pstate);
+ break;
+ case scm_tc16_complex:
+ scm_print_complex (exp, port, pstate);
+ break;
+ case scm_tc16_fraction:
+ scm_i_print_fraction (exp, port, pstate);
+ break;
+ }
+ break;
+ case scm_tc7_string:
+ if (SCM_WRITINGP (pstate))
+ {
+ size_t i, j, len;
+ const char *data;
+
+ scm_putc ('"', port);
+ len = scm_i_string_length (exp);
+ data = scm_i_string_chars (exp);
+ for (i = 0, j = 0; i < len; ++i)
+ {
+ unsigned char ch = data[i];
+ if ((ch < 32 && ch != '\n') || (127 <= ch && ch < 148))
+ {
+ static char const hex[]="0123456789abcdef";
+ char buf[4];
+
+ scm_lfwrite (data+j, i-j, port);
+ buf[0] = '\\';
+ buf[1] = 'x';
+ buf[2] = hex [ch / 16];
+ buf[3] = hex [ch % 16];
+ scm_lfwrite (buf, 4, port);
+ data = scm_i_string_chars (exp);
+ j = i+1;
+ }
+ else if (ch == '"' || ch == '\\')
+ {
+ scm_lfwrite (data+j, i-j, port);
+ scm_putc ('\\', port);
+ data = scm_i_string_chars (exp);
+ j = i;
+ }
+ }
+ scm_lfwrite (data+j, i-j, port);
+ scm_putc ('"', port);
+ scm_remember_upto_here_1 (exp);
+ }
+ else
+ scm_lfwrite (scm_i_string_chars (exp), scm_i_string_length (exp),
+ port);
+ scm_remember_upto_here_1 (exp);
+ break;
+ case scm_tc7_symbol:
+ if (scm_i_symbol_is_interned (exp))
+ {
+ scm_print_symbol_name (scm_i_symbol_chars (exp),
+ scm_i_symbol_length (exp),
+ port);
+ scm_remember_upto_here_1 (exp);
+ }
+ else
+ {
+ scm_puts ("#<uninterned-symbol ", port);
+ scm_print_symbol_name (scm_i_symbol_chars (exp),
+ scm_i_symbol_length (exp),
+ port);
+ scm_putc (' ', port);
+ scm_uintprint (SCM_UNPACK (exp), 16, port);
+ scm_putc ('>', port);
+ }
+ break;
+ case scm_tc7_variable:
+ scm_i_variable_print (exp, port, pstate);
+ break;
+ case scm_tc7_wvect:
+ ENTER_NESTED_DATA (pstate, exp, circref);
+ if (SCM_IS_WHVEC (exp))
+ scm_puts ("#wh(", port);
+ else
+ scm_puts ("#w(", port);
+ goto common_vector_printer;
+
+ case scm_tc7_vector:
+ ENTER_NESTED_DATA (pstate, exp, circref);
+ scm_puts ("#(", port);
+ common_vector_printer:
+ {
+ register long i;
+ long last = SCM_SIMPLE_VECTOR_LENGTH (exp) - 1;
+ int cutp = 0;
+ if (pstate->fancyp
+ && SCM_SIMPLE_VECTOR_LENGTH (exp) > pstate->length)
+ {
+ last = pstate->length - 1;
+ cutp = 1;
+ }
+ for (i = 0; i < last; ++i)
+ {
+ /* CHECK_INTS; */
+ scm_iprin1 (SCM_SIMPLE_VECTOR_REF (exp, i), port, pstate);
+ scm_putc (' ', port);
+ }
+ if (i == last)
+ {
+ /* CHECK_INTS; */
+ scm_iprin1 (SCM_SIMPLE_VECTOR_REF (exp, i), port, pstate);
+ }
+ if (cutp)
+ scm_puts (" ...", port);
+ scm_putc (')', port);
+ }
+ EXIT_NESTED_DATA (pstate);
+ break;
+ case scm_tcs_subrs:
+ scm_puts (SCM_SUBR_GENERIC (exp)
+ ? "#<primitive-generic "
+ : "#<primitive-procedure ",
+ port);
+ scm_puts (scm_i_symbol_chars (SCM_SNAME (exp)), port);
+ scm_putc ('>', port);
+ break;
+#ifdef CCLO
+ case scm_tc7_cclo:
+ {
+ SCM proc = SCM_CCLO_SUBR (exp);
+ if (scm_is_eq (proc, scm_f_gsubr_apply))
+ {
+ /* Print gsubrs as primitives */
+ SCM name = scm_procedure_name (exp);
+ scm_puts ("#<primitive-procedure", port);
+ if (scm_is_true (name))
+ {
+ scm_putc (' ', port);
+ scm_puts (scm_i_symbol_chars (name), port);
+ }
+ }
+ else
+ {
+ scm_puts ("#<compiled-closure ", port);
+ scm_iprin1 (proc, port, pstate);
+ }
+ scm_putc ('>', port);
+ }
+ break;
+#endif
+ case scm_tc7_pws:
+ scm_puts ("#<procedure-with-setter", port);
+ {
+ SCM name = scm_procedure_name (exp);
+ if (scm_is_true (name))
+ {
+ scm_putc (' ', port);
+ scm_display (name, port);
+ }
+ }
+ scm_putc ('>', port);
+ break;
+ case scm_tc7_port:
+ {
+ register long i = SCM_PTOBNUM (exp);
+ if (i < scm_numptob
+ && scm_ptobs[i].print
+ && (scm_ptobs[i].print) (exp, port, pstate))
+ break;
+ goto punk;
+ }
+ case scm_tc7_smob:
+ ENTER_NESTED_DATA (pstate, exp, circref);
+ SCM_SMOB_DESCRIPTOR (exp).print (exp, port, pstate);
+ EXIT_NESTED_DATA (pstate);
+ break;
+ default:
+ punk:
+ scm_ipruk ("type", exp, port);
+ }
+ }
+}
+
+/* Print states are necessary for circular reference safe printing.
+ * They are also expensive to allocate. Therefore print states are
+ * kept in a pool so that they can be reused.
+ */
+
+/* The PORT argument can also be a print-state/port pair, which will
+ * then be used instead of allocating a new print state. This is
+ * useful for continuing a chain of print calls from Scheme. */
+
+void
+scm_prin1 (SCM exp, SCM port, int writingp)
+{
+ SCM handle = SCM_BOOL_F; /* Will GC protect the handle whilst unlinked */
+ SCM pstate_scm;
+ scm_print_state *pstate;
+ int old_writingp;
+
+ /* If PORT is a print-state/port pair, use that. Else create a new
+ print-state. */
+
+ if (SCM_PORT_WITH_PS_P (port))
+ {
+ pstate_scm = SCM_PORT_WITH_PS_PS (port);
+ port = SCM_PORT_WITH_PS_PORT (port);
+ }
+ else
+ {
+ /* First try to allocate a print state from the pool */
+ scm_i_pthread_mutex_lock (&print_state_mutex);
+ if (!scm_is_null (print_state_pool))
+ {
+ handle = print_state_pool;
+ print_state_pool = SCM_CDR (print_state_pool);
+ }
+ scm_i_pthread_mutex_unlock (&print_state_mutex);
+ if (scm_is_false (handle))
+ handle = scm_list_1 (make_print_state ());
+ pstate_scm = SCM_CAR (handle);
+ }
+
+ pstate = SCM_PRINT_STATE (pstate_scm);
+ old_writingp = pstate->writingp;
+ pstate->writingp = writingp;
+ scm_iprin1 (exp, port, pstate);
+ pstate->writingp = old_writingp;
+
+ /* Return print state to pool if it has been created above and
+ hasn't escaped to Scheme. */
+
+ if (scm_is_true (handle) && !pstate->revealed)
+ {
+ scm_i_pthread_mutex_lock (&print_state_mutex);
+ SCM_SETCDR (handle, print_state_pool);
+ print_state_pool = handle;
+ scm_i_pthread_mutex_unlock (&print_state_mutex);
+ }
+}
+
+
+/* Print an integer.
+ */
+
+void
+scm_intprint (scm_t_intmax n, int radix, SCM port)
+{
+ char num_buf[SCM_INTBUFLEN];
+ scm_lfwrite (num_buf, scm_iint2str (n, radix, num_buf), port);
+}
+
+void
+scm_uintprint (scm_t_uintmax n, int radix, SCM port)
+{
+ char num_buf[SCM_INTBUFLEN];
+ scm_lfwrite (num_buf, scm_iuint2str (n, radix, num_buf), port);
+}
+
+/* Print an object of unrecognized type.
+ */
+
+void
+scm_ipruk (char *hdr, SCM ptr, SCM port)
+{
+ scm_puts ("#<unknown-", port);
+ scm_puts (hdr, port);
+ if (scm_in_heap_p (ptr))
+ {
+ scm_puts (" (0x", port);
+ scm_uintprint (SCM_CELL_WORD_0 (ptr), 16, port);
+ scm_puts (" . 0x", port);
+ scm_uintprint (SCM_CELL_WORD_1 (ptr), 16, port);
+ scm_puts (") @", port);
+ }
+ scm_puts (" 0x", port);
+ scm_uintprint (SCM_UNPACK (ptr), 16, port);
+ scm_putc ('>', port);
+}
+
+
+/* Print a list.
+ */
+void
+scm_iprlist (char *hdr, SCM exp, int tlr, SCM port, scm_print_state *pstate)
+{
+ register SCM hare, tortoise;
+ long floor = pstate->top - 2;
+ scm_puts (hdr, port);
+ /* CHECK_INTS; */
+ if (pstate->fancyp)
+ goto fancy_printing;
+
+ /* Run a hare and tortoise so that total time complexity will be
+ O(depth * N) instead of O(N^2). */
+ hare = SCM_CDR (exp);
+ tortoise = exp;
+ while (scm_is_pair (hare))
+ {
+ if (scm_is_eq (hare, tortoise))
+ goto fancy_printing;
+ hare = SCM_CDR (hare);
+ if (!scm_is_pair (hare))
+ break;
+ hare = SCM_CDR (hare);
+ tortoise = SCM_CDR (tortoise);
+ }
+
+ /* No cdr cycles intrinsic to this list */
+ scm_iprin1 (SCM_CAR (exp), port, pstate);
+ for (exp = SCM_CDR (exp); scm_is_pair (exp); exp = SCM_CDR (exp))
+ {
+ register long i;
+
+ for (i = floor; i >= 0; --i)
+ if (scm_is_eq (PSTATE_STACK_REF(pstate, i), exp))
+ goto circref;
+ PUSH_REF (pstate, exp);
+ scm_putc (' ', port);
+ /* CHECK_INTS; */
+ scm_iprin1 (SCM_CAR (exp), port, pstate);
+ }
+ if (!SCM_NULL_OR_NIL_P (exp))
+ {
+ scm_puts (" . ", port);
+ scm_iprin1 (exp, port, pstate);
+ }
+
+end:
+ scm_putc (tlr, port);
+ pstate->top = floor + 2;
+ return;
+
+fancy_printing:
+ {
+ long n = pstate->length;
+
+ scm_iprin1 (SCM_CAR (exp), port, pstate);
+ exp = SCM_CDR (exp); --n;
+ for (; scm_is_pair (exp); exp = SCM_CDR (exp))
+ {
+ register unsigned long i;
+
+ for (i = 0; i < pstate->top; ++i)
+ if (scm_is_eq (PSTATE_STACK_REF(pstate, i), exp))
+ goto fancy_circref;
+ if (pstate->fancyp)
+ {
+ if (n == 0)
+ {
+ scm_puts (" ...", port);
+ goto skip_tail;
+ }
+ else
+ --n;
+ }
+ PUSH_REF(pstate, exp);
+ ++pstate->list_offset;
+ scm_putc (' ', port);
+ /* CHECK_INTS; */
+ scm_iprin1 (SCM_CAR (exp), port, pstate);
+ }
+ }
+ if (!SCM_NULL_OR_NIL_P (exp))
+ {
+ scm_puts (" . ", port);
+ scm_iprin1 (exp, port, pstate);
+ }
+skip_tail:
+ pstate->list_offset -= pstate->top - floor - 2;
+ goto end;
+
+fancy_circref:
+ pstate->list_offset -= pstate->top - floor - 2;
+
+circref:
+ scm_puts (" . ", port);
+ print_circref (port, pstate, exp);
+ goto end;
+}
+
+\f
+
+int
+scm_valid_oport_value_p (SCM val)
+{
+ return (SCM_OPOUTPORTP (val)
+ || (SCM_PORT_WITH_PS_P (val)
+ && SCM_OPOUTPORTP (SCM_PORT_WITH_PS_PORT (val))));
+}
+
+/* SCM_GPROC(s_write, "write", 1, 1, 0, scm_write, g_write); */
+
+SCM
+scm_write (SCM obj, SCM port)
+{
+ if (SCM_UNBNDP (port))
+ port = scm_current_output_port ();
+
+ SCM_ASSERT (scm_valid_oport_value_p (port), port, SCM_ARG2, s_write);
+
+ scm_prin1 (obj, port, 1);
+#if 0
+#ifdef HAVE_PIPE
+# ifdef EPIPE
+ if (EPIPE == errno)
+ scm_close_port (port);
+# endif
+#endif
+#endif
+ return SCM_UNSPECIFIED;
+}
+
+
+/* SCM_GPROC(s_display, "display", 1, 1, 0, scm_display, g_display); */
+
+SCM
+scm_display (SCM obj, SCM port)
+{
+ if (SCM_UNBNDP (port))
+ port = scm_current_output_port ();
+
+ SCM_ASSERT (scm_valid_oport_value_p (port), port, SCM_ARG2, s_display);
+
+ scm_prin1 (obj, port, 0);
+#if 0
+#ifdef HAVE_PIPE
+# ifdef EPIPE
+ if (EPIPE == errno)
+ scm_close_port (port);
+# endif
+#endif
+#endif
+ return SCM_UNSPECIFIED;
+}
+
+
+SCM_DEFINE (scm_simple_format, "simple-format", 2, 0, 1,
+ (SCM destination, SCM message, SCM args),
+ "Write @var{message} to @var{destination}, defaulting to\n"
+ "the current output port.\n"
+ "@var{message} can contain @code{~A} (was @code{%s}) and\n"
+ "@code{~S} (was @code{%S}) escapes. When printed,\n"
+ "the escapes are replaced with corresponding members of\n"
+ "@var{ARGS}:\n"
+ "@code{~A} formats using @code{display} and @code{~S} formats\n"
+ "using @code{write}.\n"
+ "If @var{destination} is @code{#t}, then use the current output\n"
+ "port, if @var{destination} is @code{#f}, then return a string\n"
+ "containing the formatted text. Does not add a trailing newline.")
+#define FUNC_NAME s_scm_simple_format
+{
+ SCM port, answer = SCM_UNSPECIFIED;
+ int fReturnString = 0;
+ int writingp;
+ const char *start;
+ const char *end;
+ const char *p;
+
+ if (scm_is_eq (destination, SCM_BOOL_T))
+ {
+ destination = port = scm_current_output_port ();
+ }
+ else if (scm_is_false (destination))
+ {
+ fReturnString = 1;
+ port = scm_mkstrport (SCM_INUM0,
+ scm_make_string (SCM_INUM0, SCM_UNDEFINED),
+ SCM_OPN | SCM_WRTNG,
+ FUNC_NAME);
+ destination = port;
+ }
+ else
+ {
+ SCM_VALIDATE_OPORT_VALUE (1, destination);
+ port = SCM_COERCE_OUTPORT (destination);
+ }
+ SCM_VALIDATE_STRING (2, message);
+ SCM_VALIDATE_REST_ARGUMENT (args);
+
+ start = scm_i_string_chars (message);
+ end = start + scm_i_string_length (message);
+ for (p = start; p != end; ++p)
+ if (*p == '~')
+ {
+ if (++p == end)
+ break;
+
+ switch (*p)
+ {
+ case 'A': case 'a':
+ writingp = 0;
+ break;
+ case 'S': case 's':
+ writingp = 1;
+ break;
+ case '~':
+ scm_lfwrite (start, p - start, port);
+ start = p + 1;
+ continue;
+ case '%':
+ scm_lfwrite (start, p - start - 1, port);
+ scm_newline (port);
+ start = p + 1;
+ continue;
+ default:
+ SCM_MISC_ERROR ("FORMAT: Unsupported format option ~~~A - use (ice-9 format) instead",
+ scm_list_1 (SCM_MAKE_CHAR (*p)));
+
+ }
+
+
+ if (!scm_is_pair (args))
+ SCM_MISC_ERROR ("FORMAT: Missing argument for ~~~A",
+ scm_list_1 (SCM_MAKE_CHAR (*p)));
+
+ scm_lfwrite (start, p - start - 1, port);
+ /* we pass destination here */
+ scm_prin1 (SCM_CAR (args), destination, writingp);
+ args = SCM_CDR (args);
+ start = p + 1;
+ }
+
+ scm_lfwrite (start, p - start, port);
+ if (!scm_is_eq (args, SCM_EOL))
+ SCM_MISC_ERROR ("FORMAT: ~A superfluous arguments",
+ scm_list_1 (scm_length (args)));
+
+ if (fReturnString)
+ answer = scm_strport_to_string (destination);
+
+ return scm_return_first (answer, message);
+}
+#undef FUNC_NAME
+
+
+SCM_DEFINE (scm_newline, "newline", 0, 1, 0,
+ (SCM port),
+ "Send a newline to @var{port}.\n"
+ "If @var{port} is omitted, send to the current output port.")
+#define FUNC_NAME s_scm_newline
+{
+ if (SCM_UNBNDP (port))
+ port = scm_current_output_port ();
+
+ SCM_VALIDATE_OPORT_VALUE (1, port);
+
+ scm_putc ('\n', SCM_COERCE_OUTPORT (port));
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_write_char, "write-char", 1, 1, 0,
+ (SCM chr, SCM port),
+ "Send character @var{chr} to @var{port}.")
+#define FUNC_NAME s_scm_write_char
+{
+ if (SCM_UNBNDP (port))
+ port = scm_current_output_port ();
+
+ SCM_VALIDATE_CHAR (1, chr);
+ SCM_VALIDATE_OPORT_VALUE (2, port);
+
+ scm_putc ((int) SCM_CHAR (chr), SCM_COERCE_OUTPORT (port));
+#if 0
+#ifdef HAVE_PIPE
+# ifdef EPIPE
+ if (EPIPE == errno)
+ scm_close_port (port);
+# endif
+#endif
+#endif
+ return SCM_UNSPECIFIED;
+}
+#undef FUNC_NAME
+
+\f
+
+/* Call back to Scheme code to do the printing of special objects
+ * (like structs). SCM_PRINTER_APPLY applies PROC to EXP and a smob
+ * containing PORT and PSTATE. This object can be used as the port for
+ * display/write etc to continue the current print chain. The REVEALED
+ * field of PSTATE is set to true to indicate that the print state has
+ * escaped to Scheme and thus has to be freed by the GC.
+ */
+
+scm_t_bits scm_tc16_port_with_ps;
+
+/* Print exactly as the port itself would */
+
+static int
+port_with_ps_print (SCM obj, SCM port, scm_print_state *pstate)
+{
+ obj = SCM_PORT_WITH_PS_PORT (obj);
+ return scm_ptobs[SCM_PTOBNUM (obj)].print (obj, port, pstate);
+}
+
+SCM
+scm_printer_apply (SCM proc, SCM exp, SCM port, scm_print_state *pstate)
+{
+ pstate->revealed = 1;
+ return scm_call_2 (proc, exp,
+ scm_i_port_with_print_state (port, pstate->handle));
+}
+
+SCM_DEFINE (scm_port_with_print_state, "port-with-print-state", 1, 1, 0,
+ (SCM port, SCM pstate),
+ "Create a new port which behaves like @var{port}, but with an\n"
+ "included print state @var{pstate}. @var{pstate} is optional.\n"
+ "If @var{pstate} isn't supplied and @var{port} already has\n"
+ "a print state, the old print state is reused.")
+#define FUNC_NAME s_scm_port_with_print_state
+{
+ SCM_VALIDATE_OPORT_VALUE (1, port);
+ if (!SCM_UNBNDP (pstate))
+ SCM_VALIDATE_PRINTSTATE (2, pstate);
+ return scm_i_port_with_print_state (port, pstate);
+}
+#undef FUNC_NAME
+
+SCM_DEFINE (scm_get_print_state, "get-print-state", 1, 0, 0,
+ (SCM port),
+ "Return the print state of the port @var{port}. If @var{port}\n"
+ "has no associated print state, @code{#f} is returned.")
+#define FUNC_NAME s_scm_get_print_state
+{
+ if (SCM_PORT_WITH_PS_P (port))
+ return SCM_PORT_WITH_PS_PS (port);
+ if (SCM_OUTPUT_PORT_P (port))
+ return SCM_BOOL_F;
+ SCM_WRONG_TYPE_ARG (1, port);
+}
+#undef FUNC_NAME
+
+\f
+
+void
+scm_init_print ()
+{
+ SCM vtable, layout, type;
+
+ scm_init_opts (scm_print_options, scm_print_opts, SCM_N_PRINT_OPTIONS);
+
+ scm_print_options (scm_list_4 (scm_from_locale_symbol ("highlight-prefix"),
+ scm_from_locale_string ("{"),
+ scm_from_locale_symbol ("highlight-suffix"),
+ scm_from_locale_string ("}")));
+
+ scm_gc_register_root (&print_state_pool);
+ scm_gc_register_root (&scm_print_state_vtable);
+ vtable = scm_make_vtable_vtable (scm_nullstr, SCM_INUM0, SCM_EOL);
+ layout =
+ scm_make_struct_layout (scm_from_locale_string (SCM_PRINT_STATE_LAYOUT));
+ type = scm_make_struct (vtable, SCM_INUM0, scm_list_1 (layout));
+ scm_set_struct_vtable_name_x (type, scm_from_locale_symbol ("print-state"));
+ scm_print_state_vtable = type;
+
+ /* Don't want to bind a wrapper class in GOOPS, so pass 0 as arg1. */
+ scm_tc16_port_with_ps = scm_make_smob_type (0, 0);
+ scm_set_smob_mark (scm_tc16_port_with_ps, scm_markcdr);
+ scm_set_smob_print (scm_tc16_port_with_ps, port_with_ps_print);
+
+#include "libguile/print.x"
+
+ scm_print_opts[SCM_PRINT_KEYWORD_STYLE_I].val = SCM_UNPACK (sym_reader);
+}
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
projects / lilypond.git / blobdiff