xemacs-beta: src/abbrev.c comparison

comparison src/abbrev.c @ 428:3ecd8885ac67 r21-2-22

Import from CVS: tag r21-2-22

author	cvs
date	Mon, 13 Aug 2007 11:28:15 +0200
parents
children	8de8e3f6228a

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-:0a0253eac470
+:3ecd8885ac67
+/* 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 */
+int last_abbrev_location;
+/* Hook to run before expanding any abbrev.  */
+Lisp_Object Vpre_abbrev_expand_hook, Qpre_abbrev_expand_hook;
+struct abbrev_match_mapper_closure {
+struct buffer *buf;
+struct Lisp_Char_Table *chartab;
+Charcount point, maxlen;
+struct 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;
+struct Lisp_Symbol *sym = XSYMBOL (symbol);
+struct 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 struct 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;
+}
+/* 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 struct 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;
+}
+/* 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;
+}
+}
+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 */
+struct Lisp_Symbol *(*fun) (struct buffer *, Lisp_Object);
+struct Lisp_Symbol *abbrev_symbol;
+struct 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;
+}
+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;
+}

Mercurial > hg > xemacs-beta

comparison src/abbrev.c @ 428:3ecd8885ac67 r21-2-22