Add a test for log attrs

This is useful for exploring line breaking.

tests/breaks/one.break

+abc/def ghi­jkl. Bla

tests/breaks/one.expected

+Text:        a b c /  d e f [ ]  g h i [0xad]   j k l . [ ]  B l a [0x0a]  
+Breaks:     c c c c lc c c c   lc c c c      lhc c c c c   lc c c c      Lc
+Whitespace:                x                           x          w      w 
+Words:      s     e s      e   s                     e     s      e        
+Sentences:  s                                          e   s      e        

tests/meson.build

@@ -22,6 +22,7 @@ tests = [
   [ 'testcolor' ],
   [ 'testscript' ],
   [ 'cxx-test', [ 'cxx-test.cpp' ] ],
+  [ 'test-break' ],
 ]
 
 if build_pangoft2

tests/test-break.c

+/* Pango
+ * test-break.c: Test Pango line breaking
+ *
+ * Copyright (C) 2019 Red Hat, Inc
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library 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.
+ */
+
+#include <glib.h>
+#include <string.h>
+#include <locale.h>
+
+#ifndef G_OS_WIN32
+#include <unistd.h>
+#endif
+
+#include "config.h"
+#include <pango/pangocairo.h>
+#include "test-common.h"
+
+
+static PangoContext *context;
+
+static void
+test_file (const gchar *filename, GString *string)
+{
+  gchar *contents;
+  gsize  length;
+  GError *error = NULL;
+  PangoLogAttr *attrs;
+  PangoLanguage *lang;
+  int len;
+  char *p;
+  int i;
+  GString *s1, *s2, *s3, *s4;
+  int m;
+
+  if (!g_file_get_contents (filename, &contents, &length, &error))
+    {
+      fprintf (stderr, "%s\n", error->message);
+      g_error_free (error);
+      return;
+    }
+
+  len = g_utf8_strlen (contents, -1) + 1;
+  attrs = g_new (PangoLogAttr, len);
+
+  lang = pango_language_from_string ("en");
+
+  pango_get_log_attrs (contents, length, -1, lang, attrs, len);
+
+  s1 = g_string_new ("Breaks: ");
+  s2 = g_string_new ("Whitespace: ");
+  s3 = g_string_new ("Words:");
+  s4 = g_string_new ("Sentences:");
+
+  g_string_append (string, "Text: ");
+
+  m = MAX (MAX (s1->len, s2->len), MAX (s3->len, s4->len));
+
+  g_string_append_printf (s1, "%*s", (int)(m - s1->len), "");
+  g_string_append_printf (s2, "%*s", (int)(m - s2->len), "");
+  g_string_append_printf (s3, "%*s", (int)(m - s3->len), "");
+  g_string_append_printf (s4, "%*s", (int)(m - s4->len), "");
+  g_string_append_printf (string, "%*s", (int)(m - strlen ("Text: ")), "");
+
+  for (i = 0, p = contents; i < len; i++, p = g_utf8_next_char (p))
+    {
+      PangoLogAttr log = attrs[i];
+      int b = 0;
+      int w = 0;
+      int o = 0;
+      int s = 0;
+
+      if (log.is_mandatory_break)
+        {
+          g_string_append (s1, "L");
+          b++;
+        }
+      else if (log.is_line_break)
+        {
+          g_string_append (s1, "l");
+          b++;
+        }
+      if (log.is_soft_hyphen)
+        {
+          g_string_append (s1, "h");
+          b++;
+        }
+      if (log.is_char_break)
+        {
+          g_string_append (s1, "c");
+          b++;
+        }
+
+      if (log.is_expandable_space)
+        {
+          g_string_append (s2, "x");
+          w++;
+        }
+      else if (log.is_white)
+        {
+          g_string_append (s2, "w");
+          w++;
+        }
+
+      if (log.is_word_start)
+        {
+          g_string_append (s3, "s");
+          o++;
+        }
+      if (log.is_word_end)
+        {
+          g_string_append (s3, "e");
+          o++;
+        }
+
+      if (log.is_sentence_start)
+        {
+          g_string_append (s4, "s");
+          s++;
+        }
+      if (log.is_sentence_end)
+        {
+          g_string_append (s4, "e");
+          s++;
+        }
+
+      m = MAX (MAX (b, w), MAX (o, s));
+
+      g_string_append_printf (string, "%*s", m, "");
+      g_string_append_printf (s1, "%*s", m - b, "");
+      g_string_append_printf (s2, "%*s", m - w, "");
+      g_string_append_printf (s3, "%*s", m - o, "");
+      g_string_append_printf (s4, "%*s", m - s, "");
+
+      if (i < len - 1)
+        {
+          gunichar ch = g_utf8_get_char (p);
+          if (ch == 0x20)
+            {
+              g_string_append (string, "[ ]");
+              g_string_append (s1, "   ");
+              g_string_append (s2, "   ");
+              g_string_append (s3, "   ");
+              g_string_append (s4, "   ");
+            }
+          else if (g_unichar_isprint (ch))
+            {
+              g_string_append_unichar (string, ch);
+              g_string_append (s1, " ");
+              g_string_append (s2, " ");
+              g_string_append (s3, " ");
+              g_string_append (s4, " ");
+            }
+          else
+            {
+              char *str = g_strdup_printf ("[%#04x]", ch);
+              g_string_append (string, str); 
+              g_string_append_printf (s1, "%*s", (int)strlen (str), "");
+              g_string_append_printf (s2, "%*s", (int)strlen (str), "");
+              g_string_append_printf (s3, "%*s", (int)strlen (str), "");
+              g_string_append_printf (s4, "%*s", (int)strlen (str), "");
+              g_free (str);
+            }
+        }
+    }
+  g_string_append (string, "\n");
+  g_string_append_len (string, s1->str, s1->len);
+  g_string_append (string, "\n");
+  g_string_append_len (string, s2->str, s2->len);
+  g_string_append (string, "\n");
+  g_string_append_len (string, s3->str, s3->len);
+  g_string_append (string, "\n");
+  g_string_append_len (string, s4->str, s4->len);
+  g_string_append (string, "\n");
+
+  g_string_free (s1, TRUE);
+  g_string_free (s2, TRUE);
+  g_string_free (s3, TRUE);
+  g_string_free (s4, TRUE);
+
+  g_free (attrs);
+  g_free (contents);
+}
+
+static gchar *
+get_expected_filename (const gchar *filename)
+{
+  gchar *f, *p, *expected;
+
+  f = g_strdup (filename);
+  p = strstr (f, ".break");
+  if (p)
+    *p = 0;
+  expected = g_strconcat (f, ".expected", NULL);
+
+  g_free (f);
+
+  return expected;
+}
+
+static void
+test_break (gconstpointer d)
+{
+  const gchar *filename = d;
+  gchar *expected_file;
+  GError *error = NULL;
+  GString *dump;
+  gchar *diff;
+
+  expected_file = get_expected_filename (filename);
+
+  dump = g_string_sized_new (0);
+
+  test_file (filename, dump);
+
+  //diff = diff_with_file (expected_file, dump->str, dump->len, &error);
+  g_assert_no_error (error);
+
+  if (diff && diff[0])
+    {
+      g_printerr ("Contents don't match expected contents:\n%s", diff);
+      g_test_fail ();
+      g_free (diff);
+    }
+
+  g_string_free (dump, TRUE);
+  g_free (expected_file);
+}
+
+int
+main (int argc, char *argv[])
+{
+  GDir *dir;
+  GError *error = NULL;
+  const gchar *name;
+  gchar *path;
+
+  g_setenv ("LC_ALL", "en_US.UTF-8", TRUE);
+  setlocale (LC_ALL, "");
+
+  g_test_init (&argc, &argv, NULL);
+
+  context = pango_context_new ();
+
+  /* allow to easily generate expected output for new test cases */
+  if (argc > 1)
+    {
+      GString *string;
+
+      string = g_string_sized_new (0);
+      test_file (argv[1], string);
+      printf ("%s", string->str);
+
+      return 0;
+    }
+
+  path = g_test_build_filename (G_TEST_DIST, "breaks", NULL);
+  dir = g_dir_open (path, 0, &error);
+  g_free (path);
+  g_assert_no_error (error);
+  while ((name = g_dir_read_name (dir)) != NULL)
+    {
+      if (!strstr (name, "break"))
+        continue;
+
+      path = g_strdup_printf ("/break/%s", name);
+      g_test_add_data_func_full (path, g_test_build_filename (G_TEST_DIST, "breaks", name, NULL),
+                                 test_break, g_free);
+      g_free (path);
+    }
+  g_dir_close (dir);
+
+  return g_test_run ();
+}