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xdgmimeglob.c

/* -*- mode: C; c-file-style: "gnu" -*- */
/* xdgmimeglob.c: Private file.  Datastructure for storing the globs.
 *
 * More info can be found at http://www.freedesktop.org/standards/
 *
 * Copyright (C) 2003  Red Hat, Inc.
 * Copyright (C) 2003  Jonathan Blandford <jrb@alum.mit.edu>
 *
 * Licensed under the Academic Free License version 2.0
 * Or under the following terms:
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "xdgmimeglob.h"
#include "xdgmimeint.h"
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include <string.h>
#include <fnmatch.h>
#include <ctype.h>

#ifndef     FALSE
#define     FALSE (0)
#endif

#ifndef     TRUE
#define     TRUE  (!FALSE)
#endif

typedef struct XdgGlobHashNode XdgGlobHashNode;
typedef struct XdgGlobList XdgGlobList;

struct XdgGlobHashNode
{
  xdg_unichar_t character;
  const char *mime_type;
  int weight;
  XdgGlobHashNode *next;
  XdgGlobHashNode *child;
};
struct XdgGlobList
{
  const char *data;
  const char *mime_type;
  int weight;
  XdgGlobList *next;
};

struct XdgGlobHash
{
  XdgGlobList *literal_list;
  XdgGlobHashNode *simple_node;
  XdgGlobList *full_list;
};


/* XdgGlobList
 */
static XdgGlobList *
_xdg_glob_list_new (void)
{
  XdgGlobList *new_element;

  new_element = calloc (1, sizeof (XdgGlobList));

  return new_element;
}

/* Frees glob_list and all of it's children */
static void
_xdg_glob_list_free (XdgGlobList *glob_list)
{
  XdgGlobList *ptr, *next;

  ptr = glob_list;

  while (ptr != NULL)
    {
      next = ptr->next;

      if (ptr->data)
      free ((void *) ptr->data);
      if (ptr->mime_type)
      free ((void *) ptr->mime_type);
      free (ptr);

      ptr = next;
    }
}

static XdgGlobList *
_xdg_glob_list_append (XdgGlobList *glob_list,
                   void        *data,
                   const char  *mime_type,
                   int          weight)
{
  XdgGlobList *new_element;
  XdgGlobList *tmp_element;

  new_element = _xdg_glob_list_new ();
  new_element->data = data;
  new_element->mime_type = mime_type;
  new_element->weight = weight;
  if (glob_list == NULL)
    return new_element;

  tmp_element = glob_list;
  while (tmp_element->next != NULL)
    tmp_element = tmp_element->next;

  tmp_element->next = new_element;

  return glob_list;
}

/* XdgGlobHashNode
 */

static XdgGlobHashNode *
_xdg_glob_hash_node_new (void)
{
  XdgGlobHashNode *glob_hash_node;

  glob_hash_node = calloc (1, sizeof (XdgGlobHashNode));

  return glob_hash_node;
}

static void
_xdg_glob_hash_node_dump (XdgGlobHashNode *glob_hash_node,
                    int depth)
{
  int i;
  for (i = 0; i < depth; i++)
    printf (" ");

  printf ("%c", (char)glob_hash_node->character);
  if (glob_hash_node->mime_type)
    printf (" - %s %d\n", glob_hash_node->mime_type, glob_hash_node->weight);
  else
    printf ("\n");
  if (glob_hash_node->child)
    _xdg_glob_hash_node_dump (glob_hash_node->child, depth + 1);
  if (glob_hash_node->next)
    _xdg_glob_hash_node_dump (glob_hash_node->next, depth);
}

static XdgGlobHashNode *
_xdg_glob_hash_insert_ucs4 (XdgGlobHashNode *glob_hash_node,
                      xdg_unichar_t   *text,
                      const char      *mime_type,
                      int              weight)
{
  XdgGlobHashNode *node;
  xdg_unichar_t character;

  character = text[0];

  if ((glob_hash_node == NULL) ||
      (character < glob_hash_node->character))
    {
      node = _xdg_glob_hash_node_new ();
      node->character = character;
      node->next = glob_hash_node;
      glob_hash_node = node;
    }
  else if (character == glob_hash_node->character)
    {
      node = glob_hash_node;
    }
  else
    {
      XdgGlobHashNode *prev_node;
      int found_node = FALSE;

      /* Look for the first character of text in glob_hash_node, and insert it if we
       * have to.*/
      prev_node = glob_hash_node;
      node = prev_node->next;

      while (node != NULL)
      {
        if (character < node->character)
          {
            node = _xdg_glob_hash_node_new ();
            node->character = character;
            node->next = prev_node->next;
            prev_node->next = node;

            found_node = TRUE;
            break;
          }
        else if (character == node->character)
          {
            found_node = TRUE;
            break;
          }
        prev_node = node;
        node = node->next;
      }

      if (! found_node)
      {
        node = _xdg_glob_hash_node_new ();
        node->character = character;
        node->next = prev_node->next;
        prev_node->next = node;
      }
    }

  text++;
  if (*text == 0)
    {
      if (node->mime_type)
      {
        if (strcmp (node->mime_type, mime_type))
          {
            XdgGlobHashNode *child;
            int found_node = FALSE;
            
            child = node->child;
            while (child && child->character == 0)
            {
              if (strcmp (child->mime_type, mime_type) == 0)
                {
                  found_node = TRUE;
                  break;
                }
              child = child->next;
            }

            if (!found_node)
            {
              child = _xdg_glob_hash_node_new ();
              child->character = 0;
              child->mime_type = strdup (mime_type);
              child->weight = weight;
              child->child = NULL;
              child->next = node->child;
              node->child = child;
            }
          }
      }
      else
      {
        node->mime_type = strdup (mime_type);
        node->weight = weight;
      }
    }
  else
    {
      node->child = _xdg_glob_hash_insert_ucs4 (node->child, text, mime_type, weight);
    }
  return glob_hash_node;
}

/* glob must be valid UTF-8 */
static XdgGlobHashNode *
_xdg_glob_hash_insert_text (XdgGlobHashNode *glob_hash_node,
                      const char      *text,
                      const char      *mime_type,
                      int              weight)
{
  XdgGlobHashNode *node;
  xdg_unichar_t *unitext;
  int len;

  unitext = _xdg_convert_to_ucs4 (text, &len);
  _xdg_reverse_ucs4 (unitext, len);
  node = _xdg_glob_hash_insert_ucs4 (glob_hash_node, unitext, mime_type, weight);
  free (unitext);
  return node;
}

typedef struct {
  const char *mime;
  int weight;
} MimeWeight;

static int
_xdg_glob_hash_node_lookup_file_name (XdgGlobHashNode *glob_hash_node,
                              const char      *file_name,
                              int              len,
                              int              ignore_case,
                              MimeWeight       mime_types[],
                              int              n_mime_types)
{
  int n;
  XdgGlobHashNode *node;
  xdg_unichar_t character;

  if (glob_hash_node == NULL)
    return 0;

  character = file_name[len - 1];
  if (ignore_case)
    character = tolower(character);

  for (node = glob_hash_node; node && character >= node->character; node = node->next)
    {
      if (character == node->character)
        {
          len--;
          n = 0;
          if (len > 0) 
          {
            n = _xdg_glob_hash_node_lookup_file_name (node->child,
                                          file_name,
                                          len,
                                          ignore_case,
                                          mime_types,
                                          n_mime_types);
          }
        if (n == 0)
          {
              if (node->mime_type)
                {
                mime_types[n].mime = node->mime_type;
              mime_types[n].weight = node->weight;
              n++; 
                }
            node = node->child;
            while (n < n_mime_types && node && node->character == 0)
            {
                  if (node->mime_type)
                {
                  mime_types[n].mime = node->mime_type;
                  mime_types[n].weight = node->weight;
                  n++;
                }
              node = node->next;
            }
          }
        return n;
      }
    }

  return 0;
}

static int compare_mime_weight (const void *a, const void *b)
{
  const MimeWeight *aa = (const MimeWeight *)a;
  const MimeWeight *bb = (const MimeWeight *)b;

  return aa->weight - bb->weight;
}

int
_xdg_glob_hash_lookup_file_name (XdgGlobHash *glob_hash,
                         const char  *file_name,
                         const char  *mime_types[],
                         int          n_mime_types)
{
  XdgGlobList *list;
  int i, n;
  MimeWeight mimes[10];
  int n_mimes = 10;
  int len;

  /* First, check the literals */

  assert (file_name != NULL && n_mime_types > 0);

  n = 0;

  for (list = glob_hash->literal_list; list; list = list->next)
    {
      if (strcmp ((const char *)list->data, file_name) == 0)
      {
        mime_types[0] = list->mime_type;
        return 1;
      }
    }

  len = strlen (file_name);
  n = _xdg_glob_hash_node_lookup_file_name (glob_hash->simple_node, file_name, len, FALSE,
                                  mimes, n_mimes);
  if (n == 0)
    n = _xdg_glob_hash_node_lookup_file_name (glob_hash->simple_node, file_name, len, TRUE,
                                    mimes, n_mimes);

  if (n == 0)
    {
      for (list = glob_hash->full_list; list && n < n_mime_types; list = list->next)
        {
          if (fnmatch ((const char *)list->data, file_name, 0) == 0)
          {
            mimes[n].mime = list->mime_type;
            mimes[n].weight = list->weight;
            n++;
          }
        }
    }

  qsort (mimes, n, sizeof (MimeWeight), compare_mime_weight);

  if (n_mime_types < n)
    n = n_mime_types;

  for (i = 0; i < n; i++)
    mime_types[i] = mimes[i].mime;

  return n;
}



/* XdgGlobHash
 */

XdgGlobHash *
_xdg_glob_hash_new (void)
{
  XdgGlobHash *glob_hash;

  glob_hash = calloc (1, sizeof (XdgGlobHash));

  return glob_hash;
}


static void
_xdg_glob_hash_free_nodes (XdgGlobHashNode *node)
{
  if (node)
    {
      if (node->child)
       _xdg_glob_hash_free_nodes (node->child);
      if (node->next)
       _xdg_glob_hash_free_nodes (node->next);
      if (node->mime_type)
      free ((void *) node->mime_type);
      free (node);
    }
}

void
_xdg_glob_hash_free (XdgGlobHash *glob_hash)
{
  _xdg_glob_list_free (glob_hash->literal_list);
  _xdg_glob_list_free (glob_hash->full_list);
  _xdg_glob_hash_free_nodes (glob_hash->simple_node);
  free (glob_hash);
}

XdgGlobType
_xdg_glob_determine_type (const char *glob)
{
  const char *ptr;
  int maybe_in_simple_glob = FALSE;
  int first_char = TRUE;

  ptr = glob;

  while (*ptr != '\0')
    {
      if (*ptr == '*' && first_char)
      maybe_in_simple_glob = TRUE;
      else if (*ptr == '\\' || *ptr == '[' || *ptr == '?' || *ptr == '*')
        return XDG_GLOB_FULL;

      first_char = FALSE;
      ptr = _xdg_utf8_next_char (ptr);
    }
  if (maybe_in_simple_glob)
    return XDG_GLOB_SIMPLE;
  else
    return XDG_GLOB_LITERAL;
}

/* glob must be valid UTF-8 */
void
_xdg_glob_hash_append_glob (XdgGlobHash *glob_hash,
                      const char  *glob,
                      const char  *mime_type,
                      int          weight)
{
  XdgGlobType type;

  assert (glob_hash != NULL);
  assert (glob != NULL);

  type = _xdg_glob_determine_type (glob);

  switch (type)
    {
    case XDG_GLOB_LITERAL:
      glob_hash->literal_list = _xdg_glob_list_append (glob_hash->literal_list, strdup (glob), strdup (mime_type), weight);
      break;
    case XDG_GLOB_SIMPLE:
      glob_hash->simple_node = _xdg_glob_hash_insert_text (glob_hash->simple_node, glob + 1, mime_type, weight);
      break;
    case XDG_GLOB_FULL:
      glob_hash->full_list = _xdg_glob_list_append (glob_hash->full_list, strdup (glob), strdup (mime_type), weight);
      break;
    }
}

void
_xdg_glob_hash_dump (XdgGlobHash *glob_hash)
{
  XdgGlobList *list;
  printf ("LITERAL STRINGS\n");
  if (!glob_hash || glob_hash->literal_list == NULL)
    {
      printf ("    None\n");
    }
  else
    {
      for (list = glob_hash->literal_list; list; list = list->next)
      printf ("    %s - %s %d\n", (char *)list->data, list->mime_type, list->weight);
    }
  printf ("\nSIMPLE GLOBS\n");
  if (!glob_hash || glob_hash->simple_node == NULL)
    {
      printf ("    None\n");
    }
  else
    {
      _xdg_glob_hash_node_dump (glob_hash->simple_node, 4);
    }

  printf ("\nFULL GLOBS\n");
  if (!glob_hash || glob_hash->full_list == NULL)
    {
      printf ("    None\n");
    }
  else
    {
      for (list = glob_hash->full_list; list; list = list->next)
      printf ("    %s - %s %d\n", (char *)list->data, list->mime_type, list->weight);
    }
}


void
_xdg_mime_glob_read_from_file (XdgGlobHash *glob_hash,
                         const char  *file_name)
{
  FILE *glob_file;
  char line[255];

  glob_file = fopen (file_name, "r");

  if (glob_file == NULL)
    return;

  /* FIXME: Not UTF-8 safe.  Doesn't work if lines are greater than 255 chars.
   * Blah */
  while (fgets (line, 255, glob_file) != NULL)
    {
      char *colon, *colon2;
      char *mimetype, *glob;
      int weight;

      if (line[0] == '#')
      continue;

      colon = strchr (line, ':');
      if (colon == NULL)
      continue;
      *(colon++) = '\0';
      colon[strlen (colon) -1] = '\0';
      colon2 = strchr (colon, ':');
      if (colon2) 
        {
          *(colon2++) = '\000';
          weight = atoi (line);
          mimetype = colon;
          glob = colon2;
        }
      else 
        {
          weight = 50;
          mimetype = line;
          glob = colon;
        }
      _xdg_glob_hash_append_glob (glob_hash, glob, mimetype, weight);
    }

  fclose (glob_file);
}

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