contrib/texinfo-4/info/info-utils.h

   1 /* info-utils.h -- Exported functions and variables from info-utils.c.
   2    $Id: info-utils.h,v 1.4 2004/04/11 17:56:45 karl Exp $
   3
   4    Copyright (C) 1993, 1996, 1998, 2002, 2003, 2004 Free Software
   5    Foundation, Inc.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2, or (at your option)
  10    any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20
  21    Written by Brian Fox (bfox@ai.mit.edu). */
  22
  23 #ifndef INFO_UTILS_H
  24 #define INFO_UTILS_H
  25
  26 #include "nodes.h"
  27 #include "window.h"
  28 #include "search.h"
  29
  30 /* Structure which describes a node reference, such as a menu entry or
  31    cross reference.  Arrays of such references can be built by calling
  32    info_menus_of_node () or info_xrefs_of_node (). */
  33 typedef struct {
  34   char *label;          /* User Label. */
  35   char *filename;       /* File where this node can be found. */
  36   char *nodename;       /* Name of the node. */
  37   int start, end;       /* Offsets within the containing node of LABEL. */
  38   int line_number;      /* Specific line number a menu item points to.  */
  39 } REFERENCE;
  40
  41 /* When non-zero, various display and input functions handle ISO Latin
  42    character sets correctly. */
  43 extern int ISO_Latin_p;
  44
  45 /* Variable which holds the most recent filename parsed as a result of
  46    calling info_parse_xxx (). */
  47 extern char *info_parsed_filename;
  48
  49 /* Variable which holds the most recent nodename parsed as a result of
  50    calling info_parse_xxx (). */
  51 extern char *info_parsed_nodename;
  52
  53 /* Parse the filename and nodename out of STRING.  If STRING doesn't
  54    contain a filename (i.e., it is NOT (FILENAME)NODENAME) then set
  55    INFO_PARSED_FILENAME to NULL.  If second argument NEWLINES_OKAY is
  56    non-zero, it says to allow the nodename specification to cross a
  57    newline boundary (i.e., only `,', `.', or `TAB' can end the spec). */
  58 void info_parse_node (char *string, int newlines_okay);
  59
  60 /* Return a NULL terminated array of REFERENCE * which represents the menu
  61    found in NODE.  If there is no menu in NODE, just return a NULL pointer. */
  62 extern REFERENCE **info_menu_of_node (NODE *node);
  63
  64 /* Return a NULL terminated array of REFERENCE * which represents the cross
  65    refrences found in NODE.  If there are no cross references in NODE, just
  66    return a NULL pointer. */
  67 extern REFERENCE **info_xrefs_of_node (NODE *node);
  68
  69 /* Glean cross references from BINDING->buffer + BINDING->start until
  70    BINDING->end.  Return an array of REFERENCE * that represents each
  71    cross reference in this range. */
  72 extern REFERENCE **info_xrefs (SEARCH_BINDING *binding);
  73
  74 /* Get the entry associated with LABEL in REFERENCES.  Return a pointer to
  75    the reference if found, or NULL. */
  76 extern REFERENCE *info_get_labeled_reference (char *label,
  77     REFERENCE **references);
  78
  79 /* Glean menu entries from BINDING->buffer + BINDING->start until we
  80    have looked at the entire contents of BINDING.  Return an array
  81    of REFERENCE * that represents each menu item in this range. */
  82 extern REFERENCE **info_menu_items (SEARCH_BINDING *binding);
  83
  84 /* A utility function for concatenating REFERENCE **.  Returns a new
  85    REFERENCE ** which is the concatenation of REF1 and REF2.  The REF1
  86    and REF2 arrays are freed, but their contents are not. */
  87 REFERENCE **info_concatenate_references (REFERENCE **ref1, REFERENCE **ref2);
  88
  89 /* Copy an existing reference into new memory.  */
  90 extern REFERENCE *info_copy_reference (REFERENCE *src);
  91
  92 /* Free the data associated with REFERENCES. */
  93 extern void info_free_references (REFERENCE **references);
  94
  95 /* Search for sequences of whitespace or newlines in STRING, replacing
  96    all such sequences with just a single space.  Remove whitespace from
  97    start and end of string. */
  98 void canonicalize_whitespace (char *string);
  99
 100 /* Return a pointer to a string which is the printed representation
 101    of CHARACTER if it were printed at HPOS. */
 102 extern char *printed_representation (unsigned char character, int hpos);
 103
 104 /* Return a pointer to the part of PATHNAME that simply defines the file. */
 105 extern char *filename_non_directory (char *pathname);
 106
 107 /* Return non-zero if NODE is one especially created by Info. */
 108 extern int internal_info_node_p (NODE *node);
 109
 110 /* Make NODE appear to be one especially created by Info, and give it NAME. */
 111 extern void name_internal_node (NODE *node, char *name);
 112
 113 /* Return the window displaying NAME, the name of an internally created
 114    Info window. */
 115 extern WINDOW *get_internal_info_window (char *name);
 116
 117 /* Return a window displaying the node NODE. */
 118 extern WINDOW *get_window_of_node (NODE *node);
 119
 120 /* Return the node addressed by LABEL in NODE (usually one of "Prev:",
 121    "Next:", "Up:", "File:", or "Node:".  After a call to this function,
 122    the globals `info_parsed_nodename' and `info_parsed_filename' contain
 123    the information. */
 124 extern void info_parse_label (char *label, NODE *node);
 125
 126 #define info_file_label_of_node(n) info_parse_label (INFO_FILE_LABEL, n)
 127 #define info_next_label_of_node(n) info_parse_label (INFO_NEXT_LABEL, n)
 128 #define info_up_label_of_node(n)   info_parse_label (INFO_UP_LABEL, n)
 129 #define info_prev_label_of_node(n) \
 130   do { \
 131     info_parse_label (INFO_PREV_LABEL, n); \
 132     if (!info_parsed_nodename && !info_parsed_filename) \
 133       info_parse_label (INFO_ALTPREV_LABEL, n); \
 134   } while (0)
 135
 136 #endif /* not INFO_UTILS_H */