[evolution-data-server/openismus-work-master: 40/81] ECollator: Use the private EAlphabetIndex
- From: Tristan Van Berkom <tvb src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [evolution-data-server/openismus-work-master: 40/81] ECollator: Use the private EAlphabetIndex
- Date: Tue, 30 Jul 2013 21:43:45 +0000 (UTC)
commit 0db842b36c576a981c65af5f9701afd091430d27
Author: Tristan Van Berkom <tristanvb openismus com>
Date: Fri Jun 7 22:44:08 2013 +0900
ECollator: Use the private EAlphabetIndex
ECollator now exports 3 new APIs:
o e_collator_get_index_labels()
List the alphabet for the given locale
o e_collator_get_index()
Determine what position in the alphabet a given word belongs
o e_collator_generate_key_for_index()
Generate a sort key for an index (to sort between letters).
Also the ECollator now uses the alphabet index to generate sort
key prefixes, e_collator_collate() simplified to simply compare
two sort keys, this ensures the output is always the same without
duplicating the alphabet index logic in the collate function.
libedataserver/e-collator.c | 209 ++++++++++++++++++++++++++++++++++---------
libedataserver/e-collator.h | 38 +++++---
2 files changed, 190 insertions(+), 57 deletions(-)
---
diff --git a/libedataserver/e-collator.c b/libedataserver/e-collator.c
index 8636f3d..87756f2 100644
--- a/libedataserver/e-collator.c
+++ b/libedataserver/e-collator.c
@@ -19,10 +19,23 @@
* Author: Tristan Van Berkom <tristanvb openismus com>
*/
+/**
+ * SECTION: e-collator
+ * @include: libedataserver/libedataserver.h
+ * @short_description: Collation services for locale sensitive sorting
+ *
+ * The #ECollator is a wrapper object around ICU collation services and
+ * provides features to sort words in locale specific ways. The collator
+ * also provides some API for determining features of the active alphabet
+ * in the user's locale, and which words should be sorted under which
+ * letter in the user's alphabet.
+ */
+
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
+#include <stdio.h>
#include <string.h>
/* ICU includes */
@@ -31,6 +44,7 @@
#include <unicode/ustring.h>
#include "e-collator.h"
+#include "e-alphabet-index-private.h"
#define CONVERT_BUFFER_LEN 512
#define COLLATION_KEY_BUFFER_LEN 1024
@@ -47,9 +61,16 @@ G_DEFINE_BOXED_TYPE (ECollator,
struct _ECollator
{
- UCollator *coll;
+ UCollator *coll;
+
+ EAlphabetIndex *alpha_index;
+ gchar **labels;
+ gint n_labels;
+ gint underflow;
+ gint inflow;
+ gint overflow;
- gint ref_count;
+ gint ref_count;
};
/*****************************************************
@@ -100,6 +121,7 @@ print_available_locales (void)
static gchar *
canonicalize_locale (const gchar *posix_locale,
+ gchar **language_code,
GError **error)
{
UErrorCode status = U_ZERO_ERROR;
@@ -159,6 +181,9 @@ canonicalize_locale (const gchar *posix_locale,
g_free (icu_locale);
+ if (language_code)
+ *language_code = g_strdup (language_buffer);
+
return final_locale;
}
@@ -259,6 +284,7 @@ e_collator_new (const gchar *locale,
UCollator *coll;
UErrorCode status = U_ZERO_ERROR;
gchar *icu_locale;
+ gchar *language_code = NULL;
g_return_val_if_fail (locale && locale[0], NULL);
@@ -266,7 +292,7 @@ e_collator_new (const gchar *locale,
print_available_locales ();
#endif
- icu_locale = canonicalize_locale (locale, error);
+ icu_locale = canonicalize_locale (locale, &language_code, error);
if (!icu_locale)
return NULL;
@@ -279,6 +305,7 @@ e_collator_new (const gchar *locale,
icu_locale,
u_errorName (status));
+ g_free (language_code);
g_free (icu_locale);
ucol_close (coll);
return NULL;
@@ -292,6 +319,16 @@ e_collator_new (const gchar *locale,
collator->coll = coll;
collator->ref_count = 1;
+ /* Setup the AlphabeticIndex */
+ collator->alpha_index = _e_alphabet_index_cxx_new_for_language (language_code);
+ collator->labels = _e_alphabet_index_cxx_get_labels (collator->alpha_index,
+ &collator->n_labels,
+ &collator->underflow,
+ &collator->inflow,
+ &collator->overflow);
+
+ g_free (language_code);
+
return collator;
}
@@ -339,6 +376,9 @@ e_collator_unref (ECollator *collator)
if (collator->coll)
ucol_close (collator->coll);
+ _e_alphabet_index_cxx_free (collator->alpha_index);
+ g_strfreev (collator->labels);
+
g_slice_free (ECollator, collator);
}
}
@@ -370,6 +410,7 @@ e_collator_generate_key (ECollator *collator,
gchar stack_buffer[COLLATION_KEY_BUFFER_LEN];
gchar *collation_key;
gint key_len, source_len = 0;
+ gint alphabet_index;
g_return_val_if_fail (collator != NULL, NULL);
g_return_val_if_fail (str != NULL, NULL);
@@ -384,6 +425,9 @@ e_collator_generate_key (ECollator *collator,
if (!source)
return NULL;
+ /* Get the numerical index for this string */
+ alphabet_index = _e_alphabet_index_cxx_get_index (collator->alpha_index, str);
+
/* First try to generate a key in a predefined buffer size */
key_len = ucol_getSortKey (collator->coll, source, source_len,
(guchar *)stack_buffer, COLLATION_KEY_BUFFER_LEN);
@@ -392,19 +436,34 @@ e_collator_generate_key (ECollator *collator,
/* Stack buffer wasn't large enough, regenerate into a new buffer
* (add a byte for a trailing NULL char)
+ *
+ * Note we allocate 4 extra chars to hold the prefixed alphabetic
+ * index into the first 4 charachters (the 5th extra char is the trailing
+ * null character).
*/
- collation_key = g_malloc (key_len + 1);
+ collation_key = g_malloc (key_len + 5);
+
+ /* Format the alphabetic index into the first 4 chars */
+ snprintf (collation_key, 4, "%03d-", alphabet_index);
+ /* Get the sort key and put it in &collation_key[4] */
ucol_getSortKey (collator->coll, source, source_len,
- (guchar *)collation_key, key_len);
+ (guchar *)(collation_key + 4), key_len);
/* Just being paranoid, make sure we're null terminated since the API
* doesn't specify if the result length is null character inclusive
*/
- collation_key[key_len] = '\0';
+ collation_key[key_len + 4] = '\0';
} else {
- /* Make a duplicate of the generated key on the heap */
- collation_key = g_strndup (stack_buffer, key_len);
+ GString *string = g_string_new (NULL);
+
+ /* Format the alphabetic index into the first 4 chars */
+ g_string_append_printf (string, "%03d-", alphabet_index);
+
+ /* Insert the rest of the sort key from the stack buffer into the allocated buffer */
+ g_string_insert_len (string, 4, stack_buffer, key_len);
+
+ collation_key = g_string_free (string, FALSE);
}
g_free (free_me);
@@ -413,6 +472,38 @@ e_collator_generate_key (ECollator *collator,
}
/**
+ * e_collator_generate_key_for_index:
+ * @collator: An #ECollator
+ * @index: An index into the alphabetic labels
+ *
+ * Generates a sort key for the given alphabetic @index.
+ *
+ * The generated sort key is guaranteed to sort below
+ * any sort keys for words beginning with any variant of
+ * the given letter.
+ *
+ * For instance, a sort key generated for the index 5 of
+ * a latin alphabet, where the fifth index is 'E' will sort
+ * below any sort keys generated for words starting with
+ * the characters 'e', 'E', 'é', 'É', 'è' or 'È'. It will also
+ * sort above any sort keys generated for words starting with
+ * the characters 'd' or 'D'.
+ *
+ * Returns: (transfer full): A sort key for the given index
+ *
+ * Since: 3.10
+ */
+gchar *
+e_collator_generate_key_for_index (ECollator *collator,
+ gint index)
+{
+ g_return_val_if_fail (collator != NULL, NULL);
+ g_return_val_if_fail (index >= 0 && index < collator->n_labels, NULL);
+
+ return g_strdup_printf ("%03d", index);
+}
+
+/**
* e_collator_collate:
* @collator: An #ECollator
* @str_a: A string to compare
@@ -428,6 +519,8 @@ e_collator_generate_key (ECollator *collator,
* This function will first ensure that both strings are valid UTF-8.
*
* Returns: %TRUE on success, otherwise if %FALSE is returned then @error will be set.
+ *
+ * Since: 3.10
*/
gboolean
e_collator_collate (ECollator *collator,
@@ -436,55 +529,85 @@ e_collator_collate (ECollator *collator,
gint *result,
GError **error)
{
- UCollationResult ucol_result = UCOL_EQUAL;
- UChar buffer_a[CONVERT_BUFFER_LEN], buffer_b[CONVERT_BUFFER_LEN];
- UChar *free_me_a = NULL, *free_me_b = NULL;
- const UChar *ustr_a, *ustr_b;
- gint len_a = 0, len_b = 0;
- gboolean success = TRUE;
+ gchar *sort_key_a, *sort_key_b;
g_return_val_if_fail (collator != NULL, -1);
g_return_val_if_fail (str_a != NULL, -1);
g_return_val_if_fail (str_b != NULL, -1);
g_return_val_if_fail (result != NULL, -1);
- ustr_a = convert_to_ustring (str_a,
- buffer_a, CONVERT_BUFFER_LEN,
- &len_a,
- &free_me_a,
- error);
+ sort_key_a = e_collator_generate_key (collator, str_a, error);
+ if (!sort_key_a)
+ return FALSE;
- if (!ustr_a) {
- success = FALSE;
- goto out;
+ sort_key_b = e_collator_generate_key (collator, str_b, error);
+ if (!sort_key_b) {
+ g_free (sort_key_a);
+ return FALSE;
}
- ustr_b = convert_to_ustring (str_b,
- buffer_b, CONVERT_BUFFER_LEN,
- &len_b,
- &free_me_b,
- error);
+ *result = strcmp (sort_key_a, sort_key_b);
- if (!ustr_b) {
- success = FALSE;
- goto out;
- }
+ g_free (sort_key_a);
+ g_free (sort_key_b);
- ucol_result = ucol_strcoll (collator->coll, ustr_a, len_a, ustr_b, len_b);
+ return TRUE;
+}
- out:
- g_free (free_me_a);
- g_free (free_me_b);
+/**
+ * e_collator_get_index_labels:
+ * @collator: An #ECollator
+ * @n_labels: (out): The number of labels/indexes available for @collator
+ * @underflow: (allow-none) (out): The underflow index, for any words which sort below the active alphabet(s)
+ * @inflow: (allow-none) (out): The inflow index, for any words which sort between the active alphabets (if
there is more than one)
+ * @overflow: (allow-none) (out): The overflow index, for any words which sort above the active alphabet(s)
+ *
+ * Fetches the displayable labels and index positions for the active alphabet.
+ *
+ * Returns: (array zero-terminated=1) (element-type utf8) (transfer none):
+ * The array of displayable labels for each index in the active alphabet(s).
+ *
+ * Since: 3.10
+ */
+const gchar *const *
+e_collator_get_index_labels (ECollator *collator,
+ gint *n_labels,
+ gint *underflow,
+ gint *inflow,
+ gint *overflow)
+{
+ g_return_val_if_fail (collator != NULL, NULL);
- if (success) {
+ if (n_labels)
+ *n_labels = collator->n_labels;
+ if (underflow)
+ *underflow = collator->underflow;
+ if (inflow)
+ *inflow = collator->inflow;
+ if (overflow)
+ *overflow = collator->overflow;
- switch (ucol_result) {
- case UCOL_GREATER: *result = 1; break;
- case UCOL_LESS: *result = -1; break;
- case UCOL_EQUAL: *result = 0; break;
- }
+ return (const gchar *const *)collator->labels;
+}
- }
+/**
+ * e_collator_get_index:
+ * @collator: An #ECollator
+ * @str: A string
+ *
+ * Checks which index, as determined by e_collator_get_index_labels(),
+ * that @str should sort under.
+ *
+ * Returns: The alphabetic index under which @str would sort
+ *
+ * Since: 3.10
+ */
+gint
+e_collator_get_index (ECollator *collator,
+ const gchar *str)
+{
+ g_return_val_if_fail (collator != NULL, -1);
+ g_return_val_if_fail (str != NULL, -1);
- return success;
+ return _e_alphabet_index_cxx_get_index (collator->alpha_index, str);
}
diff --git a/libedataserver/e-collator.h b/libedataserver/e-collator.h
index 5d19273..59fdcc1 100644
--- a/libedataserver/e-collator.h
+++ b/libedataserver/e-collator.h
@@ -66,20 +66,30 @@ typedef enum {
*/
typedef struct _ECollator ECollator;
-GType e_collator_get_type (void);
-GQuark e_collator_error_quark (void);
-ECollator *e_collator_new (const gchar *locale,
- GError **error);
-ECollator *e_collator_ref (ECollator *collator);
-void e_collator_unref (ECollator *collator);
-gchar *e_collator_generate_key (ECollator *collator,
- const gchar *str,
- GError **error);
-gboolean e_collator_collate (ECollator *collator,
- const gchar *str_a,
- const gchar *str_b,
- gint *result,
- GError **error);
+GType e_collator_get_type (void);
+GQuark e_collator_error_quark (void);
+ECollator *e_collator_new (const gchar *locale,
+ GError **error);
+ECollator *e_collator_ref (ECollator *collator);
+void e_collator_unref (ECollator *collator);
+gchar *e_collator_generate_key (ECollator *collator,
+ const gchar *str,
+ GError **error);
+gchar *e_collator_generate_key_for_index
+ (ECollator *collator,
+ gint index);
+gboolean e_collator_collate (ECollator *collator,
+ const gchar *str_a,
+ const gchar *str_b,
+ gint *result,
+ GError **error);
+const gchar *const *e_collator_get_index_labels (ECollator *collator,
+ gint *n_labels,
+ gint *underflow,
+ gint *inflow,
+ gint *overflow);
+gint e_collator_get_index (ECollator *collator,
+ const gchar *str);
G_END_DECLS
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