isearch.c

android-w.song.android.widget

/* isearch.c - incremental searching */

/* **************************************************************** */
/*								    */
/*			I-Search and Searching			    */
/*								    */
/* **************************************************************** */

/* Copyright (C) 1987-2009 Free Software Foundation, Inc.

   This file is part of the GNU Readline Library (Readline), a library
   for reading lines of text with interactive input and history editing.      

   Readline is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   Readline 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with Readline.  If not, see <http://www.gnu.org/licenses/>.
*/

#define READLINE_LIBRARY

#if defined (HAVE_CONFIG_H)
#  include <config.h>
#endif

#include <sys/types.h>

#include <stdio.h>

#if defined (HAVE_UNISTD_H)
#  include <unistd.h>
#endif

#if defined (HAVE_STDLIB_H)
#  include <stdlib.h>
#else
#  include "ansi_stdlib.h"
#endif

#include "rldefs.h"
#include "rlmbutil.h"

#include "readline.h"
#include "history.h"

#include "rlprivate.h"
#include "xmalloc.h"

/* Variables exported to other files in the readline library. */
char *_rl_isearch_terminators = (char *)NULL;

_rl_search_cxt *_rl_iscxt = 0;

/* Variables imported from other files in the readline library. */
extern HIST_ENTRY *_rl_saved_line_for_history;

static int rl_search_history PARAMS((int, int));

static _rl_search_cxt *_rl_isearch_init PARAMS((int));
static void _rl_isearch_fini PARAMS((_rl_search_cxt *));
static int _rl_isearch_cleanup PARAMS((_rl_search_cxt *, int));

/* Last line found by the current incremental search, so we don't `find'
   identical lines many times in a row.  Now part of isearch context. */
/* static char *prev_line_found; */

/* Last search string and its length. */
static char *last_isearch_string;
static int last_isearch_string_len;

static char * const default_isearch_terminators = "\033\012";

_rl_search_cxt *
_rl_scxt_alloc (type, flags)
     int type, flags;
{
  _rl_search_cxt *cxt;

  cxt = (_rl_search_cxt *)xmalloc (sizeof (_rl_search_cxt));

  cxt->type = type;
  cxt->sflags = flags;

  cxt->search_string = 0;
  cxt->search_string_size = cxt->search_string_index = 0;

  cxt->lines = 0;
  cxt->allocated_line = 0;
  cxt->hlen = cxt->hindex = 0;

  cxt->save_point = rl_point;
  cxt->save_mark = rl_mark;
  cxt->save_line = where_history ();
  cxt->last_found_line = cxt->save_line;
  cxt->prev_line_found = 0;

  cxt->save_undo_list = 0;

  cxt->keymap = _rl_keymap;
  cxt->okeymap = _rl_keymap;

  cxt->history_pos = 0;
  cxt->direction = 0;

  cxt->lastc = 0;

  cxt->sline = 0;
  cxt->sline_len = cxt->sline_index = 0;

  cxt->search_terminators = 0;

  return cxt;
}

void
_rl_scxt_dispose (cxt, flags)
     _rl_search_cxt *cxt;
     int flags;
{
  FREE (cxt->search_string);
  FREE (cxt->allocated_line);
  FREE (cxt->lines);

  xfree (cxt);
}

/* Search backwards through the history looking for a string which is typed
   interactively.  Start with the current line. */
int
rl_reverse_search_history (sign, key)
     int sign, key;
{
  return (rl_search_history (-sign, key));
}

/* Search forwards through the history looking for a string which is typed
   interactively.  Start with the current line. */
int
rl_forward_search_history (sign, key)
     int sign, key;
{
  return (rl_search_history (sign, key));
}

/* Display the current state of the search in the echo-area.
   SEARCH_STRING contains the string that is being searched for,
   DIRECTION is zero for forward, or non-zero for reverse,
   WHERE is the history list number of the current line.  If it is
   -1, then this line is the starting one. */
static void
rl_display_search (search_string, reverse_p, where)
     char *search_string;
     int reverse_p, where;
{
  char *message;
  int msglen, searchlen;

  searchlen = (search_string && *search_string) ? strlen (search_string) : 0;

  message = (char *)xmalloc (searchlen + 33);
  msglen = 0;

#if defined (NOTDEF)
  if (where != -1)
    {
      sprintf (message, "[%d]", where + history_base);
      msglen = strlen (message);
    }
#endif /* NOTDEF */

  message[msglen++] = '(';

  if (reverse_p)
    {
      strcpy (message + msglen, "reverse-");
      msglen += 8;
    }

  strcpy (message + msglen, "i-search)`");
  msglen += 10;

  if (search_string)
    {
      strcpy (message + msglen, search_string);
      msglen += searchlen;
    }

  strcpy (message + msglen, "': ");

  rl_message ("%s", message);
  xfree (message);
  (*rl_redisplay_function) ();
}

static _rl_search_cxt *
_rl_isearch_init (direction)
     int direction;
{
  _rl_search_cxt *cxt;
  register int i;
  HIST_ENTRY **hlist;

  cxt = _rl_scxt_alloc (RL_SEARCH_ISEARCH, 0);
  if (direction < 0)
    cxt->sflags |= SF_REVERSE;

  cxt->search_terminators = _rl_isearch_terminators ? _rl_isearch_terminators
						: default_isearch_terminators;

  /* Create an arrary of pointers to the lines that we want to search. */
  hlist = history_list ();
  rl_maybe_replace_line ();
  i = 0;
  if (hlist)
    for (i = 0; hlist[i]; i++);

  /* Allocate space for this many lines, +1 for the current input line,
     and remember those lines. */
  cxt->lines = (char **)xmalloc ((1 + (cxt->hlen = i)) * sizeof (char *));
  for (i = 0; i < cxt->hlen; i++)
    cxt->lines[i] = hlist[i]->line;

  if (_rl_saved_line_for_history)
    cxt->lines[i] = _rl_saved_line_for_history->line;
  else
    {
      /* Keep track of this so we can free it. */
      cxt->allocated_line = (char *)xmalloc (1 + strlen (rl_line_buffer));
      strcpy (cxt->allocated_line, &rl_line_buffer[0]);
      cxt->lines[i] = cxt->allocated_line;
    }

  cxt->hlen++;

  /* The line where we start the search. */
  cxt->history_pos = cxt->save_line;

  rl_save_prompt ();

  /* Initialize search parameters. */
  cxt->search_string = (char *)xmalloc (cxt->search_string_size = 128);
  cxt->search_string[cxt->search_string_index = 0] = '\0';

  /* Normalize DIRECTION into 1 or -1. */
  cxt->direction = (direction >= 0) ? 1 : -1;

  cxt->sline = rl_line_buffer;
  cxt->sline_len = strlen (cxt->sline);
  cxt->sline_index = rl_point;

  _rl_iscxt = cxt;		/* save globally */

  return cxt;
}

static void
_rl_isearch_fini (cxt)
     _rl_search_cxt *cxt;
{
  /* First put back the original state. */
  strcpy (rl_line_buffer, cxt->lines[cxt->save_line]);

  rl_restore_prompt ();

  /* Save the search string for possible later use. */
  FREE (last_isearch_string);
  last_isearch_string = cxt->search_string;
  last_isearch_string_len = cxt->search_string_index;
  cxt->search_string = 0;

  if (cxt->last_found_line < cxt->save_line)
    rl_get_previous_history (cxt->save_line - cxt->last_found_line, 0);
  else
    rl_get_next_history (cxt->last_found_line - cxt->save_line, 0);

  /* If the string was not found, put point at the end of the last matching
     line.  If last_found_line == orig_line, we didn't find any matching
     history lines at all, so put point back in its original position. */
  if (cxt->sline_index < 0)
    {
      if (cxt->last_found_line == cxt->save_line)
	cxt->sline_index = cxt->save_point;
      else
	cxt->sline_index = strlen (rl_line_buffer);
      rl_mark = cxt->save_mark;
    }

  rl_point = cxt->sline_index;
  /* Don't worry about where to put the mark here; rl_get_previous_history
     and rl_get_next_history take care of it. */

  rl_clear_message ();
}

int
_rl_search_getchar (cxt)
     _rl_search_cxt *cxt;
{
  int c;

  /* Read a key and decide how to proceed. */
  RL_SETSTATE(RL_STATE_MOREINPUT);
  c = cxt->lastc = rl_read_key ();
  RL_UNSETSTATE(RL_STATE_MOREINPUT);

#if defined (HANDLE_MULTIBYTE)
  if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
    c = cxt->lastc = _rl_read_mbstring (cxt->lastc, cxt->mb, MB_LEN_MAX);
#endif

  return c;
}

/* Process just-read character C according to isearch context CXT.  Return
   -1 if the caller should just free the context and return, 0 if we should
   break out of the loop, and 1 if we should continue to read characters. */
int
_rl_isearch_dispatch (cxt, c)
     _rl_search_cxt *cxt;
     int c;
{
  int n, wstart, wlen, limit, cval;
  rl_command_func_t *f;

  f = (rl_command_func_t *)NULL;

  if (c < 0)
    {
      cxt->sflags |= SF_FAILED;
      cxt->history_pos = cxt->last_found_line;
      return -1;
    }

  /* If we are moving into a new keymap, modify cxt->keymap and go on.
     This can be a problem if c == ESC and we want to terminate the
     incremental search, so we check */
  if (c >= 0 && cxt->keymap[c].type == ISKMAP && strchr (cxt->search_terminators, cxt->lastc) == 0)
    {
      cxt->keymap = FUNCTION_TO_KEYMAP (cxt->keymap, c);
      cxt->sflags |= SF_CHGKMAP;
      /* XXX - we should probably save this sequence, so we can do