824 lines
23 KiB
C
824 lines
23 KiB
C
/* index.c -- indexing for Texinfo.
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$Id: index.c,v 1.21 1999/07/18 18:50:02 karl Exp $
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Copyright (C) 1998, 99 Free Software Foundation, Inc.
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This program 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 2, or (at your option)
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any later version.
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This program 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 this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "system.h"
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#include "index.h"
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#include "lang.h"
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#include "macro.h"
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#include "toc.h"
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/* An index element... */
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typedef struct index_elt
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{
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struct index_elt *next;
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char *entry; /* The index entry itself, after expansion. */
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char *entry_text; /* The original, non-expanded entry text. */
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char *node; /* The node from whence it came. */
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int code; /* Nonzero means add `@code{...}' when
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printing this element. */
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int defining_line; /* Line number where this entry was written. */
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char *defining_file; /* Source file for defining_line. */
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} INDEX_ELT;
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/* A list of short-names for each index.
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There are two indices into the the_indices array.
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* read_index is the index that points to the list of index
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entries that we will find if we ask for the list of entries for
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this name.
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* write_index is the index that points to the list of index entries
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that we will add new entries to.
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Initially, read_index and write_index are the same, but the
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@syncodeindex and @synindex commands can change the list we add
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entries to.
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For example, after the commands
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@cindex foo
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@defindex ii
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@synindex cp ii
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@cindex bar
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the cp index will contain the entry `foo', and the new ii
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index will contain the entry `bar'. This is consistent with the
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way texinfo.tex handles the same situation.
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In addition, for each index, it is remembered whether that index is
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a code index or not. Code indices have @code{} inserted around the
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first word when they are printed with printindex. */
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typedef struct
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{
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char *name;
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int read_index; /* index entries for `name' */
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int write_index; /* store index entries here, @synindex can change it */
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int code;
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} INDEX_ALIST;
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INDEX_ALIST **name_index_alist = NULL;
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/* An array of pointers. Each one is for a different index. The
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"synindex" command changes which array slot is pointed to by a
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given "index". */
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INDEX_ELT **the_indices = NULL;
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/* The number of defined indices. */
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int defined_indices = 0;
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/* Stuff for defining commands on the fly. */
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COMMAND **user_command_array = NULL;
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int user_command_array_len = 0;
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/* How to compare index entries for sorting. May be set to strcoll. */
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int (*index_compare_fn) () = strcasecmp;
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/* Find which element in the known list of indices has this name.
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Returns -1 if NAME isn't found. */
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static int
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find_index_offset (name)
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char *name;
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{
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int i;
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for (i = 0; i < defined_indices; i++)
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if (name_index_alist[i] && STREQ (name, name_index_alist[i]->name))
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return i;
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return -1;
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}
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/* Return a pointer to the entry of (name . index) for this name.
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Return NULL if the index doesn't exist. */
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INDEX_ALIST *
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find_index (name)
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char *name;
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{
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int offset = find_index_offset (name);
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if (offset > -1)
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return name_index_alist[offset];
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else
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return NULL;
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}
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/* User-defined commands, which happens only from user-defined indexes.
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Used to initialize the builtin indices, too. */
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void
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define_user_command (name, proc, needs_braces_p)
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char *name;
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COMMAND_FUNCTION *proc;
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int needs_braces_p;
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{
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int slot = user_command_array_len;
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user_command_array_len++;
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if (!user_command_array)
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user_command_array = xmalloc (1 * sizeof (COMMAND *));
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user_command_array = xrealloc (user_command_array,
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(1 + user_command_array_len) * sizeof (COMMAND *));
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user_command_array[slot] = xmalloc (sizeof (COMMAND));
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user_command_array[slot]->name = xstrdup (name);
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user_command_array[slot]->proc = proc;
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user_command_array[slot]->argument_in_braces = needs_braces_p;
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}
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/* Please release me, let me go... */
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static void
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free_index (index)
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INDEX_ELT *index;
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{
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INDEX_ELT *temp;
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while ((temp = index))
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{
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free (temp->entry);
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free (temp->entry_text);
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/* Do not free the node, because we already freed the tag table,
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which freed all the node names. */
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/* free (temp->node); */
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index = index->next;
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free (temp);
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}
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}
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/* Flush an index by name. This will delete the list of entries that
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would be written by a @printindex command for this index. */
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static void
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undefindex (name)
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char *name;
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{
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int i;
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int which = find_index_offset (name);
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/* The index might have already been freed if this was the target of
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an @synindex. */
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if (which < 0 || !name_index_alist[which])
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return;
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i = name_index_alist[which]->read_index;
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free_index (the_indices[i]);
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the_indices[i] = NULL;
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free (name_index_alist[which]->name);
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free (name_index_alist[which]);
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name_index_alist[which] = NULL;
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}
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/* Add the arguments to the current index command to the index NAME.
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html fixxme generate specific html anchor */
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static void
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index_add_arg (name)
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char *name;
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{
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int which;
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char *index_entry;
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INDEX_ALIST *tem;
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tem = find_index (name);
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which = tem ? tem->write_index : -1;
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if (macro_expansion_output_stream && !executing_string)
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append_to_expansion_output (input_text_offset + 1);
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get_rest_of_line (0, &index_entry);
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ignore_blank_line ();
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if (macro_expansion_output_stream && !executing_string)
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{
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char *index_line = xmalloc (strlen (index_entry) + 2);
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sprintf (index_line, "%s\n", index_entry);
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me_execute_string_keep_state (index_line, NULL);
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free (index_line);
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}
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if (which < 0)
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{
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line_error (_("Unknown index `%s'"), name);
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free (index_entry);
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}
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else
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{
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INDEX_ELT *new = xmalloc (sizeof (INDEX_ELT));
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new->next = the_indices[which];
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new->entry_text = index_entry;
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new->entry = NULL;
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new->node = current_node ? current_node : xstrdup ("");
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new->code = tem->code;
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new->defining_line = line_number - 1;
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/* We need to make a copy since input_filename may point to
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something that goes away, for example, inside a macro.
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(see the findexerr test). */
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new->defining_file = xstrdup (input_filename);
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the_indices[which] = new;
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}
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}
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/* The function which user defined index commands call. */
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static void
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gen_index ()
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{
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char *name = xstrdup (command);
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if (strlen (name) >= strlen ("index"))
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name[strlen (name) - strlen ("index")] = 0;
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index_add_arg (name);
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free (name);
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}
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/* Define an index known as NAME. We assign the slot number.
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If CODE is nonzero, make this a code index. */
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static void
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defindex (name, code)
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char *name;
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int code;
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{
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int i, slot;
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/* If it already exists, flush it. */
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undefindex (name);
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/* Try to find an empty slot. */
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slot = -1;
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for (i = 0; i < defined_indices; i++)
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if (!name_index_alist[i])
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{
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slot = i;
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break;
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}
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if (slot < 0)
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{ /* No such luck. Make space for another index. */
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slot = defined_indices;
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defined_indices++;
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name_index_alist = (INDEX_ALIST **)
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xrealloc (name_index_alist, (1 + defined_indices)
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* sizeof (INDEX_ALIST *));
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the_indices = (INDEX_ELT **)
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xrealloc (the_indices, (1 + defined_indices) * sizeof (INDEX_ELT *));
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}
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/* We have a slot. Start assigning. */
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name_index_alist[slot] = xmalloc (sizeof (INDEX_ALIST));
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name_index_alist[slot]->name = xstrdup (name);
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name_index_alist[slot]->read_index = slot;
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name_index_alist[slot]->write_index = slot;
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name_index_alist[slot]->code = code;
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the_indices[slot] = NULL;
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}
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/* Define an index NAME, implicitly @code if CODE is nonzero. */
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static void
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top_defindex (name, code)
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char *name;
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int code;
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{
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char *temp;
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temp = xmalloc (1 + strlen (name) + strlen ("index"));
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sprintf (temp, "%sindex", name);
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define_user_command (temp, gen_index, 0);
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defindex (name, code);
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free (temp);
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}
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/* Set up predefined indices. */
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void
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init_indices ()
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{
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int i;
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/* Create the default data structures. */
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/* Initialize data space. */
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if (!the_indices)
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{
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the_indices = xmalloc ((1 + defined_indices) * sizeof (INDEX_ELT *));
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the_indices[defined_indices] = NULL;
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name_index_alist = xmalloc ((1 + defined_indices)
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* sizeof (INDEX_ALIST *));
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name_index_alist[defined_indices] = NULL;
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}
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/* If there were existing indices, get rid of them now. */
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for (i = 0; i < defined_indices; i++)
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{
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undefindex (name_index_alist[i]->name);
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if (name_index_alist[i])
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{ /* Suppose we're called with two input files, and the first
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does a @synindex pg cp. Then, when we get here to start
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the second file, the "pg" element won't get freed by
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undefindex (because it's pointing to "cp"). So free it
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here; otherwise, when we try to define the pg index again
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just below, it will still point to cp. */
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free (name_index_alist[i]->name);
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free (name_index_alist[i]);
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name_index_alist[i] = NULL;
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}
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}
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/* Add the default indices. */
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top_defindex ("cp", 0); /* cp is the only non-code index. */
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top_defindex ("fn", 1);
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top_defindex ("ky", 1);
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top_defindex ("pg", 1);
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top_defindex ("tp", 1);
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top_defindex ("vr", 1);
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}
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/* Given an index name, return the offset in the_indices of this index,
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or -1 if there is no such index. */
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int
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translate_index (name)
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char *name;
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{
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INDEX_ALIST *which = find_index (name);
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if (which)
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return which->read_index;
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else
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return -1;
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}
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/* Return the index list which belongs to NAME. */
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INDEX_ELT *
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index_list (name)
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char *name;
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{
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int which = translate_index (name);
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if (which < 0)
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return (INDEX_ELT *) -1;
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else
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return the_indices[which];
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}
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/* Define a new index command. Arg is name of index. */
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static void
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gen_defindex (code)
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int code;
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{
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char *name;
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get_rest_of_line (0, &name);
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if (find_index (name))
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{
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line_error (_("Index `%s' already exists"), name);
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}
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else
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{
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char *temp = xmalloc (strlen (name) + sizeof ("index"));
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sprintf (temp, "%sindex", name);
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define_user_command (temp, gen_index, 0);
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defindex (name, code);
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free (temp);
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}
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free (name);
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}
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void
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cm_defindex ()
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{
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gen_defindex (0);
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}
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void
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cm_defcodeindex ()
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{
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gen_defindex (1);
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}
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/* Expects 2 args, on the same line. Both are index abbreviations.
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Make the first one be a synonym for the second one, i.e. make the
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first one have the same index as the second one. */
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void
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cm_synindex ()
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{
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int source, target;
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char *abbrev1, *abbrev2;
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skip_whitespace ();
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get_until_in_line (0, " ", &abbrev1);
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target = find_index_offset (abbrev1);
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skip_whitespace ();
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get_until_in_line (0, " ", &abbrev2);
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source = find_index_offset (abbrev2);
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if (source < 0 || target < 0)
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{
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line_error (_("Unknown index `%s' and/or `%s' in @synindex"),
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abbrev1, abbrev2);
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}
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else
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{
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name_index_alist[target]->write_index
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= name_index_alist[source]->write_index;
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}
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free (abbrev1);
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free (abbrev2);
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}
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void
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cm_pindex () /* Pinhead index. */
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{
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index_add_arg ("pg");
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}
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void
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cm_vindex () /* Variable index. */
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{
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index_add_arg ("vr");
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}
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void
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cm_kindex () /* Key index. */
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{
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index_add_arg ("ky");
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}
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void
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cm_cindex () /* Concept index. */
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{
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index_add_arg ("cp");
|
||
}
|
||
|
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void
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||
cm_findex () /* Function index. */
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{
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index_add_arg ("fn");
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}
|
||
|
||
void
|
||
cm_tindex () /* Data Type index. */
|
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{
|
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index_add_arg ("tp");
|
||
}
|
||
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int
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index_element_compare (element1, element2)
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INDEX_ELT **element1, **element2;
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||
{
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return index_compare_fn ((*element1)->entry, (*element2)->entry);
|
||
}
|
||
|
||
/* Force all index entries to be unique. */
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||
void
|
||
make_index_entries_unique (array, count)
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||
INDEX_ELT **array;
|
||
int count;
|
||
{
|
||
int i, j;
|
||
INDEX_ELT **copy;
|
||
int counter = 1;
|
||
|
||
copy = xmalloc ((1 + count) * sizeof (INDEX_ELT *));
|
||
|
||
for (i = 0, j = 0; i < count; i++)
|
||
{
|
||
if (i == (count - 1)
|
||
|| array[i]->node != array[i + 1]->node
|
||
|| !STREQ (array[i]->entry, array[i + 1]->entry))
|
||
copy[j++] = array[i];
|
||
else
|
||
{
|
||
free (array[i]->entry);
|
||
free (array[i]->entry_text);
|
||
free (array[i]);
|
||
}
|
||
}
|
||
copy[j] = NULL;
|
||
|
||
/* Now COPY contains only unique entries. Duplicated entries in the
|
||
original array have been freed. Replace the current array with
|
||
the copy, fixing the NEXT pointers. */
|
||
for (i = 0; copy[i]; i++)
|
||
{
|
||
copy[i]->next = copy[i + 1];
|
||
|
||
/* Fix entry names which are the same. They point to different nodes,
|
||
so we make the entry name unique. */
|
||
if (copy[i+1]
|
||
&& STREQ (copy[i]->entry, copy[i + 1]->entry)
|
||
&& !html)
|
||
{
|
||
char *new_entry_name;
|
||
|
||
new_entry_name = xmalloc (10 + strlen (copy[i]->entry));
|
||
sprintf (new_entry_name, "%s <%d>", copy[i]->entry, counter);
|
||
free (copy[i]->entry);
|
||
copy[i]->entry = new_entry_name;
|
||
counter++;
|
||
}
|
||
else
|
||
counter = 1;
|
||
|
||
array[i] = copy[i];
|
||
}
|
||
array[i] = NULL;
|
||
|
||
/* Free the storage used only by COPY. */
|
||
free (copy);
|
||
}
|
||
|
||
/* Sort the index passed in INDEX, returning an array of
|
||
pointers to elements. The array is terminated with a NULL
|
||
pointer. We call qsort because it's supposed to be fast.
|
||
I think this looks bad. */
|
||
INDEX_ELT **
|
||
sort_index (index)
|
||
INDEX_ELT *index;
|
||
{
|
||
INDEX_ELT **array;
|
||
INDEX_ELT *temp = index;
|
||
int count = 0;
|
||
int save_line_number = line_number;
|
||
char *save_input_filename = input_filename;
|
||
int save_html = html;
|
||
|
||
/* Pretend we are in non-HTML mode, for the purpose of getting the
|
||
expanded index entry that lacks any markup and other HTML escape
|
||
characters which could produce a wrong sort order. */
|
||
/* fixme: html: this still causes some markup, such as non-ASCII
|
||
characters @AE{} etc., to sort incorrectly. */
|
||
html = 0;
|
||
|
||
while (temp)
|
||
{
|
||
count++;
|
||
temp = temp->next;
|
||
}
|
||
|
||
/* We have the length. Make an array. */
|
||
|
||
array = xmalloc ((count + 1) * sizeof (INDEX_ELT *));
|
||
count = 0;
|
||
temp = index;
|
||
|
||
while (temp)
|
||
{
|
||
array[count++] = temp;
|
||
|
||
/* Set line number and input filename to the source line for this
|
||
index entry, as this expansion finds any errors. */
|
||
line_number = array[count - 1]->defining_line;
|
||
input_filename = array[count - 1]->defining_file;
|
||
|
||
/* If this particular entry should be printed as a "code" index,
|
||
then expand it as @code{entry}, i.e. as in fixed-width font. */
|
||
array[count-1]->entry = expansion (temp->entry_text,
|
||
array[count-1]->code);
|
||
|
||
temp = temp->next;
|
||
}
|
||
array[count] = NULL; /* terminate the array. */
|
||
line_number = save_line_number;
|
||
input_filename = save_input_filename;
|
||
html = save_html;
|
||
|
||
#ifdef HAVE_STRCOLL
|
||
/* This is not perfect. We should set (then restore) the locale to the
|
||
documentlanguage, so strcoll operates according to the document's
|
||
locale, not the user's. For now, I'm just going to assume that
|
||
those few new documents which use @documentlanguage will be
|
||
processed in the appropriate locale. In any case, don't use
|
||
strcoll in the C (aka POSIX) locale, that is the ASCII ordering. */
|
||
if (language_code != en)
|
||
{
|
||
char *lang_env = getenv ("LANG");
|
||
if (lang_env && !STREQ (lang_env, "C") && !STREQ (lang_env, "POSIX"))
|
||
index_compare_fn = strcoll;
|
||
}
|
||
#endif /* HAVE_STRCOLL */
|
||
|
||
/* Sort the array. */
|
||
qsort (array, count, sizeof (INDEX_ELT *), index_element_compare);
|
||
make_index_entries_unique (array, count);
|
||
return array;
|
||
}
|
||
|
||
/* Nonzero means that we are in the middle of printing an index. */
|
||
int printing_index = 0;
|
||
|
||
/* Takes one arg, a short name of an index to print.
|
||
Outputs a menu of the sorted elements of the index. */
|
||
void
|
||
cm_printindex ()
|
||
{
|
||
int item;
|
||
INDEX_ELT *index;
|
||
INDEX_ELT *last_index = 0;
|
||
INDEX_ELT **array;
|
||
char *index_name;
|
||
unsigned line_length;
|
||
char *line;
|
||
int saved_inhibit_paragraph_indentation = inhibit_paragraph_indentation;
|
||
int saved_filling_enabled = filling_enabled;
|
||
int saved_line_number = line_number;
|
||
char *saved_input_filename = input_filename;
|
||
|
||
close_paragraph ();
|
||
get_rest_of_line (0, &index_name);
|
||
|
||
index = index_list (index_name);
|
||
if (index == (INDEX_ELT *)-1)
|
||
{
|
||
line_error (_("Unknown index `%s' in @printindex"), index_name);
|
||
free (index_name);
|
||
return;
|
||
}
|
||
|
||
/* Do this before sorting, so execute_string in index_element_compare
|
||
will give the same results as when we actually print. */
|
||
printing_index = 1;
|
||
filling_enabled = 0;
|
||
inhibit_paragraph_indentation = 1;
|
||
array = sort_index (index);
|
||
|
||
close_paragraph ();
|
||
if (html)
|
||
add_word ("<ul compact>");
|
||
else if (!no_headers)
|
||
add_word ("* Menu:\n\n");
|
||
|
||
me_inhibit_expansion++;
|
||
|
||
/* This will probably be enough. */
|
||
line_length = 100;
|
||
line = xmalloc (line_length);
|
||
|
||
for (item = 0; (index = array[item]); item++)
|
||
{
|
||
/* A pathological document might have an index entry outside of any
|
||
node. Don't crash; try using the section name instead. */
|
||
char *index_node = index->node;
|
||
|
||
line_number = index->defining_line;
|
||
input_filename = index->defining_file;
|
||
|
||
if ((!index_node || !*index_node) && html)
|
||
index_node = toc_find_section_of_node (index_node);
|
||
|
||
if (!index_node || !*index_node)
|
||
{
|
||
line_error (_("Entry for index `%s' outside of any node"),
|
||
index_name);
|
||
if (html || !no_headers)
|
||
index_node = _("(outside of any node)");
|
||
}
|
||
|
||
if (html)
|
||
/* fixme: html: we should use specific index anchors pointing
|
||
to the actual location of the indexed position (but then we
|
||
have to find something to wrap the anchor around). */
|
||
{
|
||
if (last_index
|
||
&& STREQ (last_index->entry_text, index->entry_text))
|
||
add_word (", "); /* Don't repeat the previous entry. */
|
||
else
|
||
{
|
||
/* In the HTML case, the expanded index entry is not
|
||
good for us, since it was expanded for non-HTML mode
|
||
inside sort_index. So we need to HTML-escape and
|
||
expand the original entry text here. */
|
||
char *escaped_entry = xstrdup (index->entry_text);
|
||
char *expanded_entry;
|
||
|
||
/* expansion() doesn't HTML-escape the argument, so need
|
||
to do it separately. */
|
||
escaped_entry = escape_string (escaped_entry);
|
||
expanded_entry = expansion (escaped_entry, index->code);
|
||
add_word_args ("\n<li>%s: ", expanded_entry);
|
||
free (escaped_entry);
|
||
free (expanded_entry);
|
||
}
|
||
add_word ("<a href=\"");
|
||
if (index->node && *index->node)
|
||
{
|
||
/* Make sure any non-macros in the node name are expanded. */
|
||
in_fixed_width_font++;
|
||
index_node = expansion (index_node, 0);
|
||
in_fixed_width_font--;
|
||
add_anchor_name (index_node, 1);
|
||
add_word_args ("\">%s</a>", index_node);
|
||
free (index_node);
|
||
}
|
||
else if (STREQ (index_node, _("(outside of any node)")))
|
||
{
|
||
add_anchor_name (index_node, 1);
|
||
add_word_args ("\">%s</a>", index_node);
|
||
}
|
||
else
|
||
/* If we use the section instead of the (missing) node, then
|
||
index_node already includes all we need except the #. */
|
||
add_word_args ("#%s</a>", index_node);
|
||
}
|
||
else
|
||
{
|
||
unsigned new_length = strlen (index->entry);
|
||
|
||
if (new_length < 50) /* minimum length used below */
|
||
new_length = 50;
|
||
new_length += strlen (index_node) + 7; /* * : .\n\0 */
|
||
|
||
if (new_length > line_length)
|
||
{
|
||
line_length = new_length;
|
||
line = xrealloc (line, line_length);
|
||
}
|
||
/* Print the entry, nicely formatted. We've already
|
||
expanded any commands in index->entry, including any
|
||
implicit @code. Thus, can't call execute_string, since
|
||
@@ has turned into @. */
|
||
if (!no_headers)
|
||
{
|
||
sprintf (line, "* %-37s ", index->entry);
|
||
line[2 + strlen (index->entry)] = ':';
|
||
insert_string (line);
|
||
/* Make sure any non-macros in the node name are expanded. */
|
||
in_fixed_width_font++;
|
||
execute_string ("%s.\n", index_node);
|
||
in_fixed_width_font--;
|
||
}
|
||
else
|
||
{
|
||
/* With --no-headers, the @node lines are gone, so
|
||
there's little sense in referring to them in the
|
||
index. Instead, output the number or name of the
|
||
section that corresponds to that node. */
|
||
char *section_name = toc_find_section_of_node (index_node);
|
||
|
||
sprintf (line, "%-*s ", number_sections ? 50 : 1, index->entry);
|
||
line[strlen (index->entry)] = ':';
|
||
insert_string (line);
|
||
if (section_name)
|
||
{
|
||
int idx = 0;
|
||
unsigned ref_len = strlen (section_name) + 30;
|
||
|
||
if (ref_len > line_length)
|
||
{
|
||
line_length = ref_len;
|
||
line = xrealloc (line, line_length);
|
||
}
|
||
|
||
if (number_sections)
|
||
{
|
||
while (section_name[idx]
|
||
&& (isdigit (section_name[idx])
|
||
|| (idx && section_name[idx] == '.')))
|
||
idx++;
|
||
}
|
||
if (idx)
|
||
sprintf (line, " See %.*s.\n", idx, section_name);
|
||
else
|
||
sprintf (line, "\n See ``%s''.\n", section_name);
|
||
insert_string (line);
|
||
}
|
||
else
|
||
{
|
||
insert_string (" "); /* force a blank */
|
||
execute_string ("See node %s.\n", index_node);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Prevent `output_paragraph' from growing to the size of the
|
||
whole index. */
|
||
flush_output ();
|
||
last_index = index;
|
||
}
|
||
|
||
free (line);
|
||
free (index_name);
|
||
|
||
me_inhibit_expansion--;
|
||
|
||
printing_index = 0;
|
||
free (array);
|
||
close_single_paragraph ();
|
||
filling_enabled = saved_filling_enabled;
|
||
inhibit_paragraph_indentation = saved_inhibit_paragraph_indentation;
|
||
input_filename = saved_input_filename;
|
||
line_number = saved_line_number;
|
||
|
||
if (html)
|
||
add_word ("</ul>");
|
||
}
|