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-rw-r--r--djvu/djvu-text-page.c444
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diff --git a/djvu/djvu-text-page.c b/djvu/djvu-text-page.c
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--- a/djvu/djvu-text-page.c
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-/*
- * Implements search and copy functionality for Djvu files.
- * Copyright (C) 2006 Michael Hofmann <mh21@piware.de>
- *
- * This program 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.
- *
- * This program 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 this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
-#include "djvu-text-page.h"
-
-#include <libdjvu/miniexp.h>
-
-/**
- * djvu_text_page_selection_process:
- * @page: #DjvuTextPage instance
- * @p: s-expression to append
- * @delimit: character/word/... delimiter
- *
- * Appends the string in @p to the page text.
- *
- * Returns: whether the end was not reached in this s-expression
- */
-static gboolean
-djvu_text_page_selection_process (DjvuTextPage *page,
- miniexp_t p,
- int delimit)
-{
- if (page->text || p == page->start) {
- char *token_text = (char *) miniexp_to_str (miniexp_nth (5, p));
- if (page->text) {
- char *new_text =
- g_strjoin (delimit & 2 ? "\n" :
- delimit & 1 ? " " : NULL,
- page->text, token_text,
- NULL);
- g_free (page->text);
- page->text = new_text;
- } else
- page->text = g_strdup (token_text);
- if (p == page->end)
- return FALSE;
- }
- return TRUE;
-}
-
-/**
- * djvu_text_page_selection:
- * @page: #DjvuTextPage instance
- * @p: tree to append
- * @delimit: character/word/... delimiter
- *
- * Walks the tree in @p and appends the text with
- * djvu_text_page_selection_process() for all s-expressions
- * between the start and end fields.
- *
- * Returns: whether the end was not reached in this subtree
- */
-static gboolean
-djvu_text_page_selection (DjvuTextPage *page,
- miniexp_t p,
- int delimit)
-{
- g_return_val_if_fail (miniexp_consp (p) && miniexp_symbolp
- (miniexp_car (p)), FALSE);
-
- if (miniexp_car (p) != page->char_symbol)
- delimit |= miniexp_car (p) == page->word_symbol ? 1 : 2;
-
- miniexp_t deeper = miniexp_cddr (miniexp_cdddr (p));
- while (deeper != miniexp_nil) {
- miniexp_t str = miniexp_car (deeper);
- if (miniexp_stringp (str)) {
- if (!djvu_text_page_selection_process
- (page, p, delimit))
- return FALSE;
- } else {
- if (!djvu_text_page_selection
- (page, str, delimit))
- return FALSE;
- }
- delimit = 0;
- deeper = miniexp_cdr (deeper);
- }
- return TRUE;
-}
-
-static void
-djvu_text_page_limits_process (DjvuTextPage *page,
- miniexp_t p,
- EvRectangle *rect)
-{
- EvRectangle current;
-
- current.x1 = miniexp_to_int (miniexp_nth (1, p));
- current.y1 = miniexp_to_int (miniexp_nth (2, p));
- current.x2 = miniexp_to_int (miniexp_nth (3, p));
- current.y2 = miniexp_to_int (miniexp_nth (4, p));
- if (current.x2 >= rect->x1 && current.y1 <= rect->y2 &&
- current.x1 <= rect->x2 && current.y2 >= rect->y1) {
- if (page->start == miniexp_nil)
- page->start = p;
- page->end = p;
- }
-}
-
-
-static void
-djvu_text_page_limits (DjvuTextPage *page,
- miniexp_t p,
- EvRectangle *rect)
-{
- char *token_text;
-
- g_return_if_fail (miniexp_consp (p) &&
- miniexp_symbolp (miniexp_car (p)));
-
- miniexp_t deeper = miniexp_cddr (miniexp_cdddr (p));
- while (deeper != miniexp_nil) {
- miniexp_t str = miniexp_car (deeper);
- if (miniexp_stringp (str))
- djvu_text_page_limits_process (page, p, rect);
- else
- djvu_text_page_limits (page, str, rect);
-
- deeper = miniexp_cdr (deeper);
- }
-}
-
-char *
-djvu_text_page_copy (DjvuTextPage *page,
- EvRectangle *rectangle)
-{
- char* text;
-
- page->start = miniexp_nil;
- page->end = miniexp_nil;
- djvu_text_page_limits (page, page->text_structure, rectangle);
- djvu_text_page_selection (page, page->text_structure, 0);
-
- /* Do not free the string */
- text = page->text;
- page->text = NULL;
-
- return text;
-}
-
-/**
- * djvu_text_page_position:
- * @page: #DjvuTextPage instance
- * @position: index in the page text
- *
- * Returns the closest s-expression that contains the given position in
- * the page text.
- *
- * Returns: closest s-expression
- */
-static miniexp_t
-djvu_text_page_position (DjvuTextPage *page,
- int position)
-{
- GArray *links = page->links;
- int low = 0;
- int hi = links->len - 1;
- int mid = 0;
-
- g_return_val_if_fail (hi >= 0, miniexp_nil);
-
- /* Shamelessly copied from GNU classpath */
- while (low <= hi) {
- mid = (low + hi) >> 1;
- DjvuTextLink *link =
- &g_array_index (links, DjvuTextLink, mid);
- if (link->position == position)
- break;
- else if (link->position > position)
- hi = --mid;
- else
- low = mid + 1;
- }
-
- return g_array_index (page->links, DjvuTextLink, mid).pair;
-}
-
-/**
- * djvu_text_page_union:
- * @target: first rectangle and result
- * @source: second rectangle
- *
- * Calculates the bounding box of two rectangles and stores the reuslt
- * in the first.
- */
-static void
-djvu_text_page_union (EvRectangle *target,
- EvRectangle *source)
-{
- if (source->x1 < target->x1)
- target->x1 = source->x1;
- if (source->x2 > target->x2)
- target->x2 = source->x2;
- if (source->y1 < target->y1)
- target->y1 = source->y1;
- if (source->y2 > target->y2)
- target->y2 = source->y2;
-}
-
-/**
- * djvu_text_page_sexpr_process:
- * @page: #DjvuTextPage instance
- * @p: s-expression to append
- * @start: first s-expression in the selection
- * @end: last s-expression in the selection
- *
- * Appends the rectangle defined by @p to the internal bounding box rectangle.
- *
- * Returns: whether the end was not reached in this s-expression
- */
-static gboolean
-djvu_text_page_sexpr_process (DjvuTextPage *page,
- miniexp_t p,
- miniexp_t start,
- miniexp_t end)
-{
- if (page->bounding_box || p == start) {
- EvRectangle *new_rectangle = g_new (EvRectangle, 1);
- new_rectangle->x1 = miniexp_to_int (miniexp_nth (1, p));
- new_rectangle->y1 = miniexp_to_int (miniexp_nth (2, p));
- new_rectangle->x2 = miniexp_to_int (miniexp_nth (3, p));
- new_rectangle->y2 = miniexp_to_int (miniexp_nth (4, p));
- if (page->bounding_box) {
- djvu_text_page_union (page->bounding_box,
- new_rectangle);
- g_free (new_rectangle);
- } else
- page->bounding_box = new_rectangle;
- if (p == end)
- return FALSE;
- }
- return TRUE;
-}
-
-/**
- * djvu_text_page_sexpr:
- * @page: #DjvuTextPage instance
- * @p: tree to append
- * @start: first s-expression in the selection
- * @end: last s-expression in the selection
- *
- * Walks the tree in @p and extends the rectangle with
- * djvu_text_page_process() for all s-expressions between @start and @end.
- *
- * Returns: whether the end was not reached in this subtree
- */
-static gboolean
-djvu_text_page_sexpr (DjvuTextPage *page,
- miniexp_t p,
- miniexp_t start,
- miniexp_t end)
-{
- g_return_val_if_fail (miniexp_consp (p) && miniexp_symbolp
- (miniexp_car (p)), FALSE);
-
- miniexp_t deeper = miniexp_cddr (miniexp_cdddr (p));
- while (deeper != miniexp_nil) {
- miniexp_t str = miniexp_car (deeper);
- if (miniexp_stringp (str)) {
- if (!djvu_text_page_sexpr_process
- (page, p, start, end))
- return FALSE;
- } else {
- if (!djvu_text_page_sexpr
- (page, str, start, end))
- return FALSE;
- }
- deeper = miniexp_cdr (deeper);
- }
- return TRUE;
-}
-
-/**
- * djvu_text_page_box:
- * @page: #DjvuTextPage instance
- * @start: first s-expression in the selection
- * @end: last s-expression in the selection
- *
- * Builds a rectangle that contains all s-expressions in the given range.
- */
-static EvRectangle *
-djvu_text_page_box (DjvuTextPage *page,
- miniexp_t start,
- miniexp_t end)
-{
- page->bounding_box = NULL;
- djvu_text_page_sexpr (page, page->text_structure, start, end);
- return page->bounding_box;
-}
-
-/**
- * djvu_text_page_append_search:
- * @page: #DjvuTextPage instance
- * @p: tree to append
- * @case_sensitive: do not ignore case
- * @delimit: insert spaces because of higher (sentence/paragraph/...) break
- *
- * Appends the tree in @p to the internal text string.
- */
-static void
-djvu_text_page_append_text (DjvuTextPage *page,
- miniexp_t p,
- gboolean case_sensitive,
- gboolean delimit)
-{
- char *token_text;
-
- g_return_if_fail (miniexp_consp (p) &&
- miniexp_symbolp (miniexp_car (p)));
-
- delimit |= page->char_symbol != miniexp_car (p);
-
- miniexp_t deeper = miniexp_cddr (miniexp_cdddr (p));
- while (deeper != miniexp_nil) {
- miniexp_t data = miniexp_car (deeper);
- if (miniexp_stringp (data)) {
- DjvuTextLink link;
- link.position = page->text == NULL ? 0 :
- strlen (page->text);
- link.pair = p;
- g_array_append_val (page->links, link);
-
- token_text = (char *) miniexp_to_str (data);
- if (!case_sensitive)
- token_text = g_utf8_casefold (token_text, -1);
- if (page->text == NULL)
- page->text = g_strdup (token_text);
- else {
- char *new_text =
- g_strjoin (delimit ? " " : NULL,
- page->text, token_text,
- NULL);
- g_free (page->text);
- page->text = new_text;
- }
- if (!case_sensitive)
- g_free (token_text);
- } else
- djvu_text_page_append_text (page, data,
- case_sensitive, delimit);
- delimit = FALSE;
- deeper = miniexp_cdr (deeper);
- }
-}
-
-/**
- * djvu_text_page_search:
- * @page: #DjvuTextPage instance
- * @text: text to search
- *
- * Searches the page for the given text. The results list has to be
- * externally freed afterwards.
- */
-void
-djvu_text_page_search (DjvuTextPage *page,
- char *text)
-{
- char *haystack = page->text;
- int search_len;
- EvRectangle *result;
- if (page->links->len == 0)
- return;
-
- search_len = strlen (text);
- while ((haystack = strstr (haystack, text)) != NULL) {
- int start_p = haystack - page->text;
- miniexp_t start = djvu_text_page_position (page, start_p);
- int end_p = start_p + search_len - 1;
- miniexp_t end = djvu_text_page_position (page, end_p);
- result = djvu_text_page_box (page, start, end);
- g_assert (result);
- page->results = g_list_prepend (page->results, result);
- haystack = haystack + search_len;
- }
- page->results = g_list_reverse (page->results);
-}
-
-
-/**
- * djvu_text_page_prepare_search:
- * @page: #DjvuTextPage instance
- * @case_sensitive: do not ignore case
- *
- * Indexes the page text and prepares the page for subsequent searches.
- */
-void
-djvu_text_page_prepare_search (DjvuTextPage *page,
- gboolean case_sensitive)
-{
- djvu_text_page_append_text (page, page->text_structure,
- case_sensitive, FALSE);
-}
-
-/**
- * djvu_text_page_new:
- * @text: S-expression of the page text
- *
- * Creates a new page to search.
- *
- * Returns: new #DjvuTextPage instance
- */
-DjvuTextPage *
-djvu_text_page_new (miniexp_t text)
-{
- DjvuTextPage *page;
-
- page = g_new0 (DjvuTextPage, 1);
- page->links = g_array_new (FALSE, FALSE, sizeof (DjvuTextLink));
- page->char_symbol = miniexp_symbol ("char");
- page->word_symbol = miniexp_symbol ("word");
- page->text_structure = text;
- return page;
-}
-
-/**
- * djvu_text_page_free:
- * @page: #DjvuTextPage instance
- *
- * Frees the given #DjvuTextPage instance.
- */
-void
-djvu_text_page_free (DjvuTextPage *page)
-{
- g_free (page->text);
- g_array_free (page->links, TRUE);
- g_free (page);
-}
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