162 lines
5.2 KiB
C
162 lines
5.2 KiB
C
/* String conversion support for graphics terminals.
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Copyright (C) 2023-2024 Free Software Foundation, Inc.
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This file is part of GNU Emacs.
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GNU Emacs is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at
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your option) any later version.
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GNU Emacs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
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#ifndef _TEXTCONV_H_
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#include "lisp.h"
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#include "frame.h"
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/* The function pointers in this structure should be filled out by
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each GUI backend interested in supporting text conversion.
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Finally, register_texconv_interface must be called at some point
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during terminal initialization. */
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struct textconv_interface
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{
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/* Notice that the text conversion context has changed (which can
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happen if the window is deleted or switches buffers, or an
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unexpected buffer change occurs.) */
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void (*reset) (struct frame *);
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/* Notice that point or mark has moved in the specified frame's
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selected window's selected buffer. The second argument is the
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window whose point changed, and the third argument is the
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buffer. */
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void (*point_changed) (struct frame *, struct window *,
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struct buffer *);
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/* Notice that the preconversion region has changed without point
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being moved. */
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void (*compose_region_changed) (struct frame *);
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/* Notice that an asynch conversion identified by COUNTER has
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completed. */
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void (*notify_conversion) (unsigned long);
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};
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enum textconv_caret_direction
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{
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TEXTCONV_FORWARD_CHAR,
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TEXTCONV_BACKWARD_CHAR,
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TEXTCONV_FORWARD_WORD,
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TEXTCONV_BACKWARD_WORD,
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TEXTCONV_CARET_UP,
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TEXTCONV_CARET_DOWN,
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TEXTCONV_NEXT_LINE,
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TEXTCONV_PREVIOUS_LINE,
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TEXTCONV_LINE_START,
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TEXTCONV_LINE_END,
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TEXTCONV_ABSOLUTE_POSITION,
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};
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enum textconv_operation
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{
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TEXTCONV_SUBSTITUTION,
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TEXTCONV_RETRIEVAL,
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};
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/* Structure describing text in a buffer corresponding to a ``struct
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textconv_callback_struct''. */
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struct textconv_conversion_text
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{
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/* Length of the text in characters and bytes. */
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size_t length, bytes;
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/* Pointer to the text data. This must be deallocated by the
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caller. */
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char *text;
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};
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/* Structure describing a single query submitted by the input
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method. */
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struct textconv_callback_struct
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{
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/* Character position, relative to the current spot location, from
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where on text should be returned. */
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EMACS_INT position;
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/* The type of scanning to perform to determine either the start or
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the end of the conversion. */
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enum textconv_caret_direction direction;
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/* The the number of times for which to repeat the scanning in order
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to determine the starting position of the text to return. */
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unsigned short factor;
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/* The operation to perform upon the current buffer contents.
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If this is TEXTCONV_SUBSTITUTION, then the text that is returned
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will be deleted from the buffer itself.
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Otherwise, the text is simply returned without modifying the
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buffer contents. */
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enum textconv_operation operation;
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/* Structure that will be filled with a description of the resulting
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text. */
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struct textconv_conversion_text text;
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};
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#define TEXTCONV_SKIP_CONVERSION_REGION (1 << 0)
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extern int textconv_query (struct frame *, struct textconv_callback_struct *,
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int);
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extern bool detect_conversion_events (void);
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extern void handle_pending_conversion_events (void);
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extern void start_batch_edit (struct frame *, unsigned long);
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extern void end_batch_edit (struct frame *, unsigned long);
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extern void commit_text (struct frame *, Lisp_Object, ptrdiff_t,
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unsigned long);
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extern void finish_composing_text (struct frame *, unsigned long,
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bool);
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extern void set_composing_text (struct frame *, Lisp_Object,
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ptrdiff_t, unsigned long);
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extern void set_composing_region (struct frame *, ptrdiff_t, ptrdiff_t,
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unsigned long);
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extern void textconv_set_point_and_mark (struct frame *, ptrdiff_t,
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ptrdiff_t, unsigned long);
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extern void delete_surrounding_text (struct frame *, ptrdiff_t,
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ptrdiff_t, unsigned long);
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extern void request_point_update (struct frame *, unsigned long);
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extern void textconv_barrier (struct frame *, unsigned long);
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extern void replace_text (struct frame *, ptrdiff_t, ptrdiff_t,
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Lisp_Object, ptrdiff_t, unsigned long);
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extern char *get_extracted_text (struct frame *, ptrdiff_t, ptrdiff_t *,
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ptrdiff_t *, ptrdiff_t *, ptrdiff_t *,
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ptrdiff_t *, bool *);
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extern char *get_surrounding_text (struct frame *, ptrdiff_t,
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ptrdiff_t, ptrdiff_t *,
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ptrdiff_t *, ptrdiff_t *,
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ptrdiff_t *, ptrdiff_t *);
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extern bool conversion_disabled_p (void);
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extern void check_postponed_buffers (void);
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extern void get_conversion_field (struct frame *, ptrdiff_t *, ptrdiff_t *);
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extern void register_textconv_interface (struct textconv_interface *);
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#endif /* _TEXTCONV_H_ */
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