395 lines
9.3 KiB
C
395 lines
9.3 KiB
C
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: readline.c *
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* Last rev: 5/2/88 *
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* mods: *
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* comments: Input/Output C implemented predicates *
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* *
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*************************************************************************/
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#ifdef SCCS
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static char SccsId[] = "%W% %G%";
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#endif
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/*
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* This file includes the interface to the readline library, if installed in the
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*system.
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*
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*/
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#include "Yap.h"
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#include "Yatom.h"
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#include "YapHeap.h"
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#include "yapio.h"
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#include <stdlib.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#if HAVE_STDARG_H
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#include <stdarg.h>
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#endif
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#ifdef _WIN32
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#if HAVE_IO_H
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/* Windows */
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#include <io.h>
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#endif
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#if HAVE_SOCKET
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#include <winsock2.h>
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#endif
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#include <windows.h>
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#ifndef S_ISDIR
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#define S_ISDIR(x) (((x)&_S_IFDIR) == _S_IFDIR)
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#endif
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#endif
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#include "iopreds.h"
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#if USE_READLINE
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#include <readline/readline.h>
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#include <readline/history.h>
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static int ReadlineGetc(int);
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static int ReadlinePutc(int, int);
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static const char *history_file;
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#define READLINE_OUT_BUF_MAX 256
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typedef struct scan_atoms {
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Int pos;
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Atom atom;
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} scan_atoms_t;
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static char *atom_enumerate(const char *prefix, int state) {
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CACHE_REGS
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struct scan_atoms *index;
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Atom catom;
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Int i;
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if (!state) {
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index = (struct scan_atoms *)malloc(sizeof(struct scan_atoms));
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i = 0;
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catom = NIL;
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} else {
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CACHE_REGS
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index = LOCAL_search_atoms;
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catom = index->atom;
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i = index->pos;
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}
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while (catom != NIL || i < AtomHashTableSize) {
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// if ( is_signalled() ) /* Notably allow windows version */
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// PL_handle_signals(); /* to break out on ^C */
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AtomEntry *ap;
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if (catom == NIL) {
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/* move away from current hash table line */
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READ_LOCK(HashChain[i].AERWLock);
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catom = HashChain[i].Entry;
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READ_UNLOCK(HashChain[i].AERWLock);
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i++;
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} else {
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ap = RepAtom(catom);
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READ_LOCK(ap->ARWLock);
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if (strstr((char *)ap->StrOfAE, prefix) == (char *)ap->StrOfAE) {
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index->pos = i;
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index->atom = ap->NextOfAE;
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LOCAL_search_atoms = index;
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READ_UNLOCK(ap->ARWLock);
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return ap->StrOfAE;
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}
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catom = ap->NextOfAE;
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READ_UNLOCK(ap->ARWLock);
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}
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}
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LOCAL_search_atoms = NULL;
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free(index);
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return NULL;
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}
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static char *atom_generator(const char *prefix, int state) {
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char *s = atom_enumerate(prefix, state);
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if (s) {
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char *copy = malloc(1 + strlen(s));
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if (copy) /* else pretend no completion */
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strcpy(copy, s);
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s = copy;
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}
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return s;
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}
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static char **prolog_completion(const char *text, int start, int end) {
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char **matches = NULL;
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if ((start == 1 && rl_line_buffer[0] == '[') || /* [file */
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(start == 2 && strncmp(rl_line_buffer, "['", 2)))
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matches = rl_completion_matches((char *)text, /* for pre-4.2 */
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rl_filename_completion_function);
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else
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matches = rl_completion_matches((char *)text, atom_generator);
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return matches;
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}
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void Yap_ReadlineFlush(int sno) {
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if (GLOBAL_Stream[sno].status & Tty_Stream_f &&
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GLOBAL_Stream[sno].status & Output_Stream_f) {
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rl_redisplay();
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}
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}
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bool Yap_ReadlinePrompt(StreamDesc *s) {
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if (s->status & Tty_Stream_f) {
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s->stream_getc = ReadlineGetc;
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if (GLOBAL_Stream[0].status & Tty_Stream_f &&
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s->name == GLOBAL_Stream[0].name)
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s->stream_putc = ReadlinePutc;
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return true;
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}
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return false;
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}
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bool Yap_ReadlineOps(StreamDesc *s) {
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if (s->status & Tty_Stream_f) {
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if (GLOBAL_Stream[0].status & Tty_Stream_f &&
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is_same_tty(s->file, GLOBAL_Stream[0].file))
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s->stream_putc = ReadlinePutc;
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s->stream_getc = ReadlineGetc;
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s->status |= Readline_Stream_f;
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return true;
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}
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return false;
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}
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static int prolog_complete(int ignore, int key) {
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if (rl_point > 0 && rl_line_buffer[rl_point - 1] != ' ') {
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#if HAVE_DECL_RL_CATCH_SIGNALS_ /* actually version >= 1.2, or true readline \
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*/
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rl_begin_undo_group();
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rl_complete(ignore, key);
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if (rl_point > 0 && rl_line_buffer[rl_point - 1] == ' ') {
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rl_delete_text(rl_point - 1, rl_point);
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rl_point -= 1;
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rl_delete(-1, key);
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}
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rl_end_undo_group();
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#endif
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} else
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rl_complete(ignore, key);
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return 0;
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}
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bool Yap_InitReadline(Term enable) {
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// don't call readline within emacs
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// if (getenv("ËMACS"))
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// return;
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if (enable == TermFalse)
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return true;
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GLOBAL_Stream[StdInStream].u.irl.buf = NULL;
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GLOBAL_Stream[StdInStream].u.irl.ptr = NULL;
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GLOBAL_Stream[StdInStream].status |= Readline_Stream_f;
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#if _MSC_VER || defined(__MINGW32__)
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rl_instream = stdin;
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#endif
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rl_outstream = stderr;
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using_history();
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const char *s = Yap_AbsoluteFile("~/.YAP.history", NULL, true);
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if (!read_history(s)) {
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FILE *f = fopen(s, "w");
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if (f) {
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fclose(f);
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read_history(s);
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}
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}
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rl_readline_name = "Prolog";
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rl_attempted_completion_function = prolog_completion;
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#ifdef HAVE_RL_COMPLETION_FUNC_T
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rl_add_defun("prolog-complete", prolog_complete, '\t');
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#else
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rl_add_defun("prolog-complete", (void *)prolog_complete, '\t');
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#endif
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return Yap_ReadlineOps(GLOBAL_Stream + StdInStream);
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}
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static bool getLine(int inp, int out) {
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CACHE_REGS
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rl_instream = GLOBAL_Stream[inp].file;
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rl_outstream = GLOBAL_Stream[out].file;
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const unsigned char *myrl_line;
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StreamDesc *s = GLOBAL_Stream + inp;
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if (!(s->status & Tty_Stream_f))
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return false;
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/* window of vulnerability opened */
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fflush(NULL);
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LOCAL_PrologMode |= ConsoleGetcMode;
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if (LOCAL_newline) { // no output so far
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myrl_line = (unsigned char *)readline(LOCAL_Prompt);
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} else {
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myrl_line = (unsigned char *)readline(NULL);
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}
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/* Do it the gnu way */
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if (LOCAL_PrologMode & InterruptMode) {
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Yap_external_signal(0, YAP_INT_SIGNAL);
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LOCAL_PrologMode &= ~ConsoleGetcMode;
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if (LOCAL_PrologMode & AbortMode) {
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Yap_Error(ABORT_EVENT, TermNil, "");
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LOCAL_ErrorMessage = "Abort";
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return console_post_process_eof(s);
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}
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} else {
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LOCAL_PrologMode &= ~ConsoleGetcMode;
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LOCAL_newline = true;
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}
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strncpy(LOCAL_Prompt, RepAtom(LOCAL_AtPrompt)->StrOfAE, MAX_PROMPT);
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/* window of vulnerability closed */
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if (myrl_line == NULL)
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return false;
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if (myrl_line[0] != '\0' && myrl_line[1] != '\0') {
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add_history((char *)myrl_line);
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append_history(1, history_file);
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}
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s->u.irl.ptr = s->u.irl.buf = myrl_line;
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return true;
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}
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static int ReadlinePutc(int sno, int ch) {
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CACHE_REGS
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StreamDesc *s = &GLOBAL_Stream[sno];
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#if MAC || _MSC_VER || defined(__MINGW32__)
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if (ch == 10) {
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putc('\n', s->file);
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} else
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#endif
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putc(ch, s->file);
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console_count_output_char(ch, s);
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if (ch == 10) {
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Yap_ReadlineFlush(sno);
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LOCAL_newline = true;
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}
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return ((int)ch);
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}
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/**
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@brief reading from the console is complicated because we need to
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know whether to prompt and so on...
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EOF must be handled by resetting the file.
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*/
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static int ReadlineGetc(int sno) {
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StreamDesc *s = &GLOBAL_Stream[sno];
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int ch;
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bool fetch = (s->u.irl.buf == NULL);
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if (!fetch || getLine(sno, StdErrStream)) {
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const unsigned char *ttyptr = s->u.irl.ptr++, *myrl_line = s->u.irl.buf;
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ch = *ttyptr;
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if (ch == '\0') {
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ch = '\n';
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free((void *)myrl_line);
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s->u.irl.ptr = s->u.irl.buf = NULL;
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}
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} else {
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return EOF;
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}
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return console_post_process_read_char(ch, s);
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}
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/**
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@brief Yap_ReadlinePeekChar peeks the next char from the
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readline buffer, but does not actually grab it.
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The idea is to take advantage of the buffering. Special care must be taken
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with EOF, though.
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*/
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Int Yap_ReadlinePeekChar(int sno) {
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StreamDesc *s = &GLOBAL_Stream[sno];
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int ch;
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if (s->u.irl.buf) {
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const unsigned char *ttyptr = s->u.irl.ptr;
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ch = *ttyptr;
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if (ch == '\0') {
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ch = '\n';
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}
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return ch;
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}
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if (getLine(sno, StdErrStream)) {
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CACHE_REGS
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ch = s->u.irl.ptr[0];
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if (ch == '\0') {
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ch = '\n';
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}
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if (ch == '\n') {
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LOCAL_newline = true;
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} else {
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LOCAL_newline = false;
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}
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} else {
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return EOF;
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}
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return ch;
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}
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int Yap_ReadlineForSIGINT(void) {
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CACHE_REGS
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int ch;
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StreamDesc *s = &GLOBAL_Stream[StdInStream];
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const unsigned char *myrl_line = s->u.irl.buf;
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if ((LOCAL_PrologMode & ConsoleGetcMode) && myrl_line != NULL) {
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ch = myrl_line[0];
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free((void *)myrl_line);
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myrl_line = NULL;
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return ch;
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} else {
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myrl_line = (const unsigned char *)readline("Action (h for help): ");
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if (!myrl_line) {
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ch = EOF;
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return ch;
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} else {
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ch = myrl_line[0];
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free((void *)myrl_line);
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myrl_line = NULL;
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return ch;
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}
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}
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}
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static Int has_readline(USES_REGS1) {
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#if USE_READLINE
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return true;
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#else
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return false;
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#endif
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}
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void Yap_InitReadlinePreds(void) {
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Yap_InitCPred("$has_readline", 0, has_readline,
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SafePredFlag | HiddenPredFlag);
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}
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#else
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bool Yap_InitReadline(Term enable) {
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if (enable == TermTrue)
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return true;
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return false;
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}
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void Yap_InitReadlinePreds(void) {}
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#endif
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