[evolution-data-server/openismus-work-3-8] EBookBackendSqliteDB: Support regex queries

[Tristan Van Berkom <tvb src gnome org>]

commit 139077836acd0de93bc9024e1abed7f4e9dbb20f
Author: Tristan Van Berkom <tristanvb openismus com>
Date:   Tue Apr 23 17:36:47 2013 +0900

    EBookBackendSqliteDB: Support regex queries
    
    E_BOOK_QUERY_REGEX_NORMAL is supported in summary queries if the
    query field is summarized, E_BOOK_QUERY_REGEX_RAW and normalized
    but non-summarized queries are delegated to EBookBackendSexp for
    matching.

 .../libedata-book/e-book-backend-sqlitedb.c        |   88 ++++++++++++++++++-
 1 files changed, 83 insertions(+), 5 deletions(-)
---
diff --git a/addressbook/libedata-book/e-book-backend-sqlitedb.c 
b/addressbook/libedata-book/e-book-backend-sqlitedb.c
index 6308c78..ec6ac82 100644
--- a/addressbook/libedata-book/e-book-backend-sqlitedb.c
+++ b/addressbook/libedata-book/e-book-backend-sqlitedb.c
@@ -1425,6 +1425,44 @@ create_collation (gpointer data,
        }
 }
 
+static void
+ebsdb_regexp (sqlite3_context *context, 
+             int argc, 
+             sqlite3_value **argv)
+{
+       GRegex *regex;
+       const gchar *expression;
+       const gchar *text;
+
+       /* Reuse the same GRegex for all REGEXP queries with the same expression */
+       regex = sqlite3_get_auxdata (context, 0);
+       if (!regex) {
+               GError *error = NULL;
+
+               expression = (const gchar *)sqlite3_value_text (argv[0]);
+
+               regex = g_regex_new (expression, 0, 0, &error);
+
+               if (!regex) {
+                       sqlite3_result_error (context, error->message, -1);
+                       g_error_free (error);
+                       return;
+               }
+
+               /* SQLite will take care of freeing the GRegex when we're done with the query */
+               sqlite3_set_auxdata (context, 0, regex, (void(*)(void*))g_regex_unref);
+       }
+
+       /* Now perform the comparison */
+       text = (const gchar *)sqlite3_value_text (argv[1]);
+       if (text != NULL) {
+               gboolean match;
+
+               match = g_regex_match (regex, text, 0, NULL);
+               sqlite3_result_int (context, match ? 1 : 0);
+       }
+}
+
 static gboolean
 book_backend_sqlitedb_load (EBookBackendSqliteDB *ebsdb,
                             const gchar *filename,
@@ -1440,6 +1478,10 @@ book_backend_sqlitedb_load (EBookBackendSqliteDB *ebsdb,
        if (ret == SQLITE_OK)
                ret = sqlite3_collation_needed (ebsdb->priv->db, ebsdb, create_collation);
 
+       if (ret == SQLITE_OK)
+               ret = sqlite3_create_function (ebsdb->priv->db, "regexp", 2, SQLITE_UTF8, ebsdb,
+                                              ebsdb_regexp, NULL, NULL);
+
        if (ret != SQLITE_OK) {
                if (!ebsdb->priv->db) {
                        g_set_error (
@@ -3037,6 +3079,23 @@ func_check_phone (struct _ESExp *f,
        return r;
 }
 
+static ESExpResult *
+func_check_regex_raw (struct _ESExp         *f,
+                     gint                  argc,
+                     struct _ESExpResult **argv,
+                     gpointer              data)
+{
+       /* Raw REGEX queries are not in the summary, we only keep
+        * normalized data in the summary
+        */
+       ESExpResult *r;
+
+       r = e_sexp_result_new (f, ESEXP_RES_INT);
+       r->value.number = 0;
+
+       return r;
+}
+
 /* 'builtin' functions */
 static const struct {
        const gchar *name;
@@ -3054,7 +3113,9 @@ static const struct {
        { "exists", func_check, 0 },
        { "eqphone", func_check_phone, 0 },
        { "eqphone_national", func_check_phone, 0 },
-       { "eqphone_short", func_check_phone, 0 }
+       { "eqphone_short", func_check_phone, 0 },
+       { "regex_normal", func_check, 0 },
+       { "regex_raw", func_check_regex_raw, 0 },
 };
 
 static gboolean
@@ -3236,7 +3297,8 @@ typedef enum {
        MATCH_ENDS_WITH,
        MATCH_PHONE_NUMBER,
        MATCH_NATIONAL_PHONE_NUMBER,
-       MATCH_SHORT_PHONE_NUMBER
+       MATCH_SHORT_PHONE_NUMBER,
+       MATCH_REGEX
 } MatchType;
 
 typedef enum {
@@ -3288,7 +3350,7 @@ convert_string_value (EBookBackendSqliteDB *ebsdb,
 
        g_return_val_if_fail (value != NULL, NULL);
 
-       if (flags & CONVERT_NORMALIZE)
+       if ((flags & CONVERT_NORMALIZE) && match != MATCH_REGEX)
                normal = e_util_utf8_normalize (value);
        else
                normal = g_strdup (value);
@@ -3312,6 +3374,7 @@ convert_string_value (EBookBackendSqliteDB *ebsdb,
        case MATCH_IS:
        case MATCH_PHONE_NUMBER:
        case MATCH_NATIONAL_PHONE_NUMBER:
+       case MATCH_REGEX:
                break;
        }
 
@@ -3328,7 +3391,7 @@ convert_string_value (EBookBackendSqliteDB *ebsdb,
        while ((c = *ptr++)) {
                if (c == '\'') {
                        g_string_append_c (str, '\'');
-               } else if (c == '%' || c == '^') {
+               } else if ((c == '%' || c == '^') && match != MATCH_REGEX) {
                        g_string_append_c (str, '^');
                        escape_modifier_needed = TRUE;
                }
@@ -3347,6 +3410,7 @@ convert_string_value (EBookBackendSqliteDB *ebsdb,
        case MATCH_PHONE_NUMBER:
        case MATCH_NATIONAL_PHONE_NUMBER:
        case MATCH_SHORT_PHONE_NUMBER:
+       case MATCH_REGEX:
                break;
        }
 
@@ -3523,6 +3587,9 @@ field_oper (MatchType match)
        case MATCH_NATIONAL_PHONE_NUMBER:
                return "=";
 
+       case MATCH_REGEX:
+               return "REGEXP";
+
        case MATCH_CONTAINS:
        case MATCH_BEGINS_WITH:
        case MATCH_ENDS_WITH:
@@ -3717,6 +3784,16 @@ func_eqphone_short (struct _ESExp *f,
        return convert_match_exp (f, argc, argv, data, MATCH_SHORT_PHONE_NUMBER);
 }
 
+static ESExpResult *
+func_regex (struct _ESExp *f,
+           gint argc,
+           struct _ESExpResult **argv,
+           gpointer data)
+{
+       return convert_match_exp (f, argc, argv, data, MATCH_REGEX);
+}
+
+
 /* 'builtin' functions */
 static struct {
        const gchar *name;
@@ -3732,7 +3809,8 @@ static struct {
        { "endswith", func_endswith, 0 },
        { "eqphone", func_eqphone, 0 },
        { "eqphone_national", func_eqphone_national, 0 },
-       { "eqphone_short", func_eqphone_short, 0 }
+       { "eqphone_short", func_eqphone_short, 0 },
+       { "regex_normal", func_regex, 0 }
 };
 
 static gchar *