--- /dev/null
+/* Primitives for word-abbrev mode.
+ Copyright (C) 1985, 1986, 1992, 1993 Free Software Foundation, Inc.
+
+This file is part of XEmacs.
+
+XEmacs 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 2, or (at your option) any
+later version.
+
+XEmacs 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 XEmacs; see the file COPYING. If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
+
+/* Synched up with: FSF 19.30. Note that there are many more functions in
+ FSF's abbrev.c. These have been moved into Lisp in XEmacs. */
+
+/* Authorship:
+
+ FSF: Original version; a long time ago.
+ JWZ or Mly: Mostly moved into Lisp; maybe 1992.
+ Ben Wing: Some changes for Mule for 19.12.
+ Hrvoje Niksic: Largely rewritten in June 1997.
+*/
+
+/* This file has been Mule-ized. */
+
+#include <config.h>
+#include "lisp.h"
+
+#include "buffer.h"
+#include "commands.h"
+#include "insdel.h"
+#include "syntax.h"
+#include "window.h"
+
+/* An abbrev table is an obarray.
+ Each defined abbrev is represented by a symbol in that obarray
+ whose print name is the abbreviation.
+ The symbol's value is a string which is the expansion.
+ If its function definition is non-nil, it is called
+ after the expansion is done.
+ The plist slot of the abbrev symbol is its usage count. */
+
+/* The table of global abbrevs. These are in effect
+ in any buffer in which abbrev mode is turned on. */
+Lisp_Object Vglobal_abbrev_table;
+
+int abbrev_all_caps;
+
+/* Non-nil => use this location as the start of abbrev to expand
+ (rather than taking the word before point as the abbrev) */
+Lisp_Object Vabbrev_start_location;
+
+/* Buffer that Vabbrev_start_location applies to */
+Lisp_Object Vabbrev_start_location_buffer;
+
+/* The symbol representing the abbrev most recently expanded */
+Lisp_Object Vlast_abbrev;
+
+/* A string for the actual text of the abbrev most recently expanded.
+ This has more info than Vlast_abbrev since case is significant. */
+Lisp_Object Vlast_abbrev_text;
+
+/* Character address of start of last abbrev expanded */
+Fixnum last_abbrev_location;
+
+/* Hook to run before expanding any abbrev. */
+Lisp_Object Vpre_abbrev_expand_hook, Qpre_abbrev_expand_hook;
+
+\f
+struct abbrev_match_mapper_closure {
+ struct buffer *buf;
+ Lisp_Char_Table *chartab;
+ Charcount point, maxlen;
+ Lisp_Symbol *found;
+};
+
+/* For use by abbrev_match(): Match SYMBOL's name against buffer text
+ before point, case-insensitively. When found, return non-zero, so
+ that map_obarray terminates mapping. */
+static int
+abbrev_match_mapper (Lisp_Object symbol, void *arg)
+{
+ struct abbrev_match_mapper_closure *closure =
+ (struct abbrev_match_mapper_closure *)arg;
+ Charcount abbrev_length;
+ Lisp_Symbol *sym = XSYMBOL (symbol);
+ Lisp_String *abbrev;
+
+ /* symbol_value should be OK here, because abbrevs are not expected
+ to contain any SYMBOL_MAGIC stuff. */
+ if (UNBOUNDP (symbol_value (sym)) || NILP (symbol_value (sym)))
+ {
+ /* The symbol value of nil means that abbrev got undefined. */
+ return 0;
+ }
+ abbrev = symbol_name (sym);
+ abbrev_length = string_char_length (abbrev);
+ if (abbrev_length > closure->maxlen)
+ {
+ /* This abbrev is too large -- it wouldn't fit. */
+ return 0;
+ }
+ /* If `bar' is an abbrev, and a user presses `fubar<SPC>', we don't
+ normally want to expand it. OTOH, if the abbrev begins with
+ non-word syntax (e.g. `#if'), it is OK to abbreviate it anywhere. */
+ if (abbrev_length < closure->maxlen && abbrev_length > 0
+ && (WORD_SYNTAX_P (closure->chartab, string_char (abbrev, 0)))
+ && (WORD_SYNTAX_P (closure->chartab,
+ BUF_FETCH_CHAR (closure->buf,
+ closure->point - (abbrev_length + 1)))))
+ {
+ return 0;
+ }
+ /* Match abbreviation string against buffer text. */
+ {
+ Bufbyte *ptr = string_data (abbrev);
+ Charcount idx;
+
+ for (idx = 0; idx < abbrev_length; idx++)
+ {
+ if (DOWNCASE (closure->buf,
+ BUF_FETCH_CHAR (closure->buf,
+ closure->point - abbrev_length + idx))
+ != DOWNCASE (closure->buf, charptr_emchar (ptr)))
+ {
+ break;
+ }
+ INC_CHARPTR (ptr);
+ }
+ if (idx == abbrev_length)
+ {
+ /* This is the one. */
+ closure->found = sym;
+ return 1;
+ }
+ }
+ return 0;
+}
+
+/* Match the buffer text against names of symbols in obarray. Returns
+ the matching symbol, or 0 if not found. */
+static Lisp_Symbol *
+abbrev_match (struct buffer *buf, Lisp_Object obarray)
+{
+ struct abbrev_match_mapper_closure closure;
+
+ /* Precalculate some stuff, so mapper function needn't to it in each
+ iteration. */
+ closure.buf = buf;
+ closure.point = BUF_PT (buf);
+ closure.maxlen = closure.point - BUF_BEGV (buf);
+ closure.chartab = XCHAR_TABLE (buf->mirror_syntax_table);
+ closure.found = 0;
+
+ map_obarray (obarray, abbrev_match_mapper, &closure);
+
+ return closure.found;
+}
+\f
+/* Take the word before point (or Vabbrev_start_location, if non-nil),
+ and look it up in OBARRAY, and return the symbol (or zero). This
+ used to be the default method of searching, with the obvious
+ limitation that the abbrevs may consist only of word characters.
+ It is an order of magnitude faster than the proper abbrev_match(),
+ but then again, vi is an order of magnitude faster than Emacs.
+
+ This speed difference should be unnoticeable, though. I have tested
+ the degenerated cases of thousands of abbrevs being defined, and
+ abbrev_match() was still fast enough for normal operation. */
+static Lisp_Symbol *
+abbrev_oblookup (struct buffer *buf, Lisp_Object obarray)
+{
+ Bufpos wordstart, wordend;
+ Bufbyte *word, *p;
+ Bytecount idx;
+ Lisp_Object lookup;
+
+ CHECK_VECTOR (obarray);
+
+ if (!NILP (Vabbrev_start_location))
+ {
+ wordstart = get_buffer_pos_char (buf, Vabbrev_start_location,
+ GB_COERCE_RANGE);
+ Vabbrev_start_location = Qnil;
+#if 0
+ /* Previously, abbrev-prefix-mark crockishly inserted a dash to
+ indicate the abbrev start point. It now uses an extent with
+ a begin glyph so there's no dash to remove. */
+ if (wordstart != BUF_ZV (buf)
+ && BUF_FETCH_CHAR (buf, wordstart) == '-')
+ {
+ buffer_delete_range (buf, wordstart, wordstart + 1, 0);
+ }
+#endif
+ wordend = BUF_PT (buf);
+ }
+ else
+ {
+ Bufpos point = BUF_PT (buf);
+
+ wordstart = scan_words (buf, point, -1);
+ if (!wordstart)
+ return 0;
+
+ wordend = scan_words (buf, wordstart, 1);
+ if (!wordend)
+ return 0;
+ if (wordend > BUF_ZV (buf))
+ wordend = BUF_ZV (buf);
+ if (wordend > point)
+ wordend = point;
+ /* Unlike the original function, we allow expansion only after
+ the abbrev, not preceded by a number of spaces. This is
+ because of consistency with abbrev_match. */
+ if (wordend < point)
+ return 0;
+ }
+
+ if (wordend <= wordstart)
+ return 0;
+
+ p = word = (Bufbyte *) alloca (MAX_EMCHAR_LEN * (wordend - wordstart));
+ for (idx = wordstart; idx < wordend; idx++)
+ {
+ Emchar c = BUF_FETCH_CHAR (buf, idx);
+ if (UPPERCASEP (buf, c))
+ c = DOWNCASE (buf, c);
+ p += set_charptr_emchar (p, c);
+ }
+ lookup = oblookup (obarray, word, p - word);
+ if (SYMBOLP (lookup) && !NILP (symbol_value (XSYMBOL (lookup))))
+ return XSYMBOL (lookup);
+ else
+ return NULL;
+}
+\f
+/* Return non-zero if OBARRAY contains an interned symbol ` '. */
+static int
+obarray_has_blank_p (Lisp_Object obarray)
+{
+ return !ZEROP (oblookup (obarray, (Bufbyte *)" ", 1));
+}
+
+/* Analyze case in the buffer substring, and report it. */
+static void
+abbrev_count_case (struct buffer *buf, Bufpos pos, Charcount length,
+ int *lccount, int *uccount)
+{
+ *lccount = *uccount = 0;
+ while (length--)
+ {
+ Emchar c = BUF_FETCH_CHAR (buf, pos);
+ if (UPPERCASEP (buf, c))
+ ++*uccount;
+ else if (LOWERCASEP (buf, c))
+ ++*lccount;
+ ++pos;
+ }
+}
+\f
+DEFUN ("expand-abbrev", Fexpand_abbrev, 0, 0, "", /*
+Expand the abbrev before point, if any.
+Effective when explicitly called even when `abbrev-mode' is nil.
+Returns the abbrev symbol, if expansion took place.
+If no abbrev matched, but `pre-abbrev-expand-hook' changed the buffer,
+ returns t.
+*/
+ ())
+{
+ /* This function can GC */
+ struct buffer *buf = current_buffer;
+ int oldmodiff = BUF_MODIFF (buf);
+ Lisp_Object pre_modiff_p;
+ Bufpos point; /* position of point */
+ Bufpos abbrev_start; /* position of abbreviation beginning */
+
+ Lisp_Symbol *(*fun) (struct buffer *, Lisp_Object);
+
+ Lisp_Symbol *abbrev_symbol;
+ Lisp_String *abbrev_string;
+ Lisp_Object expansion, count, hook;
+ Charcount abbrev_length;
+ int lccount, uccount;
+
+ run_hook (Qpre_abbrev_expand_hook);
+ /* If the hook changes the buffer, treat that as having "done an
+ expansion". */
+ pre_modiff_p = (BUF_MODIFF (buf) != oldmodiff ? Qt : Qnil);
+
+ abbrev_symbol = NULL;
+ if (!BUFFERP (Vabbrev_start_location_buffer) ||
+ XBUFFER (Vabbrev_start_location_buffer) != buf)
+ Vabbrev_start_location = Qnil;
+ /* We use the more general abbrev_match() if the obarray blank flag
+ is not set, and Vabbrev_start_location is nil. Otherwise, use
+ abbrev_oblookup(). */
+#define MATCHFUN(tbl) ((obarray_has_blank_p (tbl) \
+ && NILP (Vabbrev_start_location)) \
+ ? abbrev_match : abbrev_oblookup)
+ if (!NILP (buf->abbrev_table))
+ {
+ fun = MATCHFUN (buf->abbrev_table);
+ abbrev_symbol = fun (buf, buf->abbrev_table);
+ }
+ if (!abbrev_symbol && !NILP (Vglobal_abbrev_table))
+ {
+ fun = MATCHFUN (Vglobal_abbrev_table);
+ abbrev_symbol = fun (buf, Vglobal_abbrev_table);
+ }
+ if (!abbrev_symbol)
+ return pre_modiff_p;
+
+ /* NOTE: we hope that `pre-abbrev-expand-hook' didn't do something
+ nasty, such as changed the buffer. Here we protect against the
+ buffer getting killed. */
+ if (! BUFFER_LIVE_P (buf))
+ return Qnil;
+ point = BUF_PT (buf);
+
+ /* OK, we're out of the must-be-fast part. An abbreviation matched.
+ Now find the parameters, insert the expansion, and make it all
+ look pretty. */
+ abbrev_string = symbol_name (abbrev_symbol);
+ abbrev_length = string_char_length (abbrev_string);
+ abbrev_start = point - abbrev_length;
+
+ expansion = symbol_value (abbrev_symbol);
+ CHECK_STRING (expansion);
+
+ count = symbol_plist (abbrev_symbol); /* Gag */
+ if (NILP (count))
+ count = Qzero;
+ else
+ CHECK_NATNUM (count);
+ symbol_plist (abbrev_symbol) = make_int (1 + XINT (count));
+
+ /* Count the case in the original text. */
+ abbrev_count_case (buf, abbrev_start, abbrev_length, &lccount, &uccount);
+
+ /* Remember the last abbrev text, location, etc. */
+ XSETSYMBOL (Vlast_abbrev, abbrev_symbol);
+ Vlast_abbrev_text =
+ make_string_from_buffer (buf, abbrev_start, abbrev_length);
+ last_abbrev_location = abbrev_start;
+
+ /* Add an undo boundary, in case we are doing this for a
+ self-inserting command which has avoided making one so far. */
+ if (INTERACTIVE)
+ Fundo_boundary ();
+
+ /* Remove the abbrev */
+ buffer_delete_range (buf, abbrev_start, point, 0);
+ /* And insert the expansion. */
+ buffer_insert_lisp_string (buf, expansion);
+ point = BUF_PT (buf);
+
+ /* Now fiddle with the case. */
+ if (uccount && !lccount)
+ {
+ /* Abbrev was all caps */
+ if (!abbrev_all_caps
+ && scan_words (buf, point, -1) > scan_words (buf, abbrev_start, 1))
+ {
+ Fupcase_initials_region (make_int (abbrev_start), make_int (point),
+ make_buffer (buf));
+ }
+ else
+ {
+ /* If expansion is one word, or if user says so, upcase it all. */
+ Fupcase_region (make_int (abbrev_start), make_int (point),
+ make_buffer (buf));
+ }
+ }
+ else if (uccount)
+ {
+ /* Abbrev included some caps. Cap first initial of expansion */
+ Bufpos pos = abbrev_start;
+ /* Find the initial. */
+ while (pos < point
+ && !WORD_SYNTAX_P (XCHAR_TABLE (buf->mirror_syntax_table),
+ BUF_FETCH_CHAR (buf, pos)))
+ pos++;
+ /* Change just that. */
+ Fupcase_initials_region (make_int (pos), make_int (pos + 1),
+ make_buffer (buf));
+ }
+
+ hook = symbol_function (abbrev_symbol);
+ if (!NILP (hook) && !UNBOUNDP (hook))
+ call0 (hook);
+
+ return Vlast_abbrev;
+}
+
+\f
+void
+syms_of_abbrev (void)
+{
+ defsymbol (&Qpre_abbrev_expand_hook, "pre-abbrev-expand-hook");
+ DEFSUBR (Fexpand_abbrev);
+}
+
+void
+vars_of_abbrev (void)
+{
+ DEFVAR_LISP ("global-abbrev-table", &Vglobal_abbrev_table /*
+The abbrev table whose abbrevs affect all buffers.
+Each buffer may also have a local abbrev table.
+If it does, the local table overrides the global one
+for any particular abbrev defined in both.
+*/ );
+ Vglobal_abbrev_table = Qnil; /* setup by Lisp code */
+
+ DEFVAR_LISP ("last-abbrev", &Vlast_abbrev /*
+The abbrev-symbol of the last abbrev expanded.
+See the function `abbrev-symbol'.
+*/ );
+
+ DEFVAR_LISP ("last-abbrev-text", &Vlast_abbrev_text /*
+The exact text of the last abbrev expanded.
+nil if the abbrev has already been unexpanded.
+*/ );
+
+ DEFVAR_INT ("last-abbrev-location", &last_abbrev_location /*
+The location of the start of the last abbrev expanded.
+*/ );
+
+ Vlast_abbrev = Qnil;
+ Vlast_abbrev_text = Qnil;
+ last_abbrev_location = 0;
+
+ DEFVAR_LISP ("abbrev-start-location", &Vabbrev_start_location /*
+Buffer position for `expand-abbrev' to use as the start of the abbrev.
+nil means use the word before point as the abbrev.
+Calling `expand-abbrev' sets this to nil.
+*/ );
+ Vabbrev_start_location = Qnil;
+
+ DEFVAR_LISP ("abbrev-start-location-buffer", &Vabbrev_start_location_buffer /*
+Buffer that `abbrev-start-location' has been set for.
+Trying to expand an abbrev in any other buffer clears `abbrev-start-location'.
+*/ );
+ Vabbrev_start_location_buffer = Qnil;
+
+ DEFVAR_BOOL ("abbrev-all-caps", &abbrev_all_caps /*
+*Non-nil means expand multi-word abbrevs all caps if abbrev was so.
+*/ );
+ abbrev_all_caps = 0;
+
+ DEFVAR_LISP ("pre-abbrev-expand-hook", &Vpre_abbrev_expand_hook /*
+Function or functions to be called before abbrev expansion is done.
+This is the first thing that `expand-abbrev' does, and so this may change
+the current abbrev table before abbrev lookup happens.
+*/ );
+ Vpre_abbrev_expand_hook = Qnil;
+}
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