[gucharmap] all: Use PCRE2 instead of GRegex

[Christian Persch <chpe src gnome org>]

commit ad8325126ea2541969014279e32289923180830d
Author: Christian Persch <chpe src gnome org>
Date:   Thu Sep 16 00:10:20 2021 +0200

    all: Use PCRE2 instead of GRegex

 gucharmap/gucharmap-charmap.c | 43 +++++++++++++++++++++++++++++++------------
 gucharmap/meson.build         |  1 +
 meson.build                   |  8 +++++---
 3 files changed, 37 insertions(+), 15 deletions(-)
---
diff --git a/gucharmap/gucharmap-charmap.c b/gucharmap/gucharmap-charmap.c
index daadd1ce..c9b7cc3f 100644
--- a/gucharmap/gucharmap-charmap.c
+++ b/gucharmap/gucharmap-charmap.c
@@ -29,6 +29,9 @@
 #include "gucharmap-marshal.h"
 #include "gucharmap-private.h"
 
+#define PCRE2_CODE_UNIT_WIDTH 0
+#include <pcre2.h>
+
 struct _GucharmapCharmapPrivate {
   GtkWidget *notebook;
   GucharmapChaptersView *chapters_view;
@@ -367,18 +370,34 @@ insert_hanja_prop_detail (GucharmapCharmap *charmap,
   gtk_text_buffer_insert (buffer, iter, name, -1);
   gtk_text_buffer_insert (buffer, iter, " ", -1);
 
-  GError *err = NULL;
-  GRegex *regex = g_regex_new ("[\\w:\\w*]", 0, 0, &err);
-  g_assert_no_error (err);
-
-  GMatchInfo *match_info = NULL;
-  g_regex_match (regex, value, 0, &match_info);
-  gboolean matches = g_match_info_matches (match_info);
-
-  g_regex_unref (regex);
-  g_match_info_free (match_info);
-
-  if (!matches) {
+  int errcode;
+  size_t erroffset;
+  pcre2_code_8* code = pcre2_compile_8 ((PCRE2_SPTR8)"[\\w:\\w*]",
+                                        PCRE2_ZERO_TERMINATED,
+                                        0, /* compile flags */
+                                        &errcode,
+                                        &erroffset,
+                                        NULL /* general context */);
+  g_assert_nonnull (code);
+
+  pcre2_match_context_8* context = pcre2_match_context_create_8 (NULL);
+  pcre2_set_match_limit_8 (context, 256); /* plenty */
+
+  pcre2_match_data_8* data = pcre2_match_data_create_from_pattern_8 (code, NULL);
+
+  int matches = pcre2_match_8 (code,
+                               (PCRE2_SPTR8)value,
+                               PCRE2_ZERO_TERMINATED,
+                               0, /* start offset */
+                               0, /* match flags */
+                               data,
+                               context);
+
+  pcre2_match_context_free_8 (context);
+  pcre2_match_data_free_8 (data);
+  pcre2_code_free_8 (code);
+
+  if (matches <= 0) {
     gtk_text_buffer_insert_with_tags_by_name (buffer, iter, value, -1,
                                               "detail-value", NULL);
     gtk_text_buffer_insert (buffer, iter, "\n", -1);
diff --git a/gucharmap/meson.build b/gucharmap/meson.build
index 873634fe..76e6f689 100644
--- a/gucharmap/meson.build
+++ b/gucharmap/meson.build
@@ -140,6 +140,7 @@ libgucharmap_gtk3_public_deps = [
   gio_dep,
   glib_dep,
   gtk3_dep,
+  pcre2_dep,
 ]
 
 libgucharmap_gtk3_deps = libgucharmap_gtk3_public_deps
diff --git a/meson.build b/meson.build
index 7f3f5ed4..9529f5d1 100644
--- a/meson.build
+++ b/meson.build
@@ -37,6 +37,7 @@ freetype2_req_version = '1.0'
 gio_req_version       = '2.32.0'
 glib_req_version      = '2.32.0'
 gtk3_req_version      = '3.4.0'
+pcre2_req_version     = '10.21'
 
 # NOTE! This is an exact requirement. Each gucharmap version (major.minor) is
 # designed to work with, and only with, this unicode version. Upgrading to
@@ -231,9 +232,10 @@ endforeach
 
 # Dependencies
 
-freetype2_dep = dependency('freetype2', version: '>=' + freetype2_req_version,)
-gio_dep       = dependency('gio-2.0',   version: '>=' + gio_req_version,)
-glib_dep      = dependency('glib-2.0',  version: '>=' + glib_req_version,)
+freetype2_dep = dependency('freetype2',  version: '>=' + freetype2_req_version,)
+gio_dep       = dependency('gio-2.0',    version: '>=' + gio_req_version,)
+glib_dep      = dependency('glib-2.0',   version: '>=' + glib_req_version,)
+pcre2_dep     = dependency('libpcre2-8', version: '>=' + pcre2_req_version)
 
 if get_option('gtk3')
   gtk3_dep = dependency('gtk+-3.0',  version: '>=' + gtk3_req_version,)