Unicode support for strings

Add suport for using unicode strings in .scad files. Support iterating
across them/accessing them via [] and searching.
--------
Add GLIB (to build for test and normal build -- both with installed and
built locally development files).
Add support for unicode chars to length and search builtin functions and
[] for strings.
Added unicode testing functions.
Ad GLIB to library info page.

1 files changed, 36 insertions, 0 deletions

diff --git a/testdata/scad/misc/string-unicode.scad b/testdata/scad/misc/string-unicode.scad
new file mode 100644
index 0000000..d8e3e5c
--- /dev/null
+++ b/testdata/scad/misc/string-unicode.scad
@@ -0,0 +1,36 @@
+//Test how well arrays of unicode string are accessed.
+
+texts_array = [
+"DEADBEEF",
+"Ленивый рыжий кот",
+"كسول الزنجبيل القط",
+"懶惰的姜貓",
+"äöü ÄÖÜ ß",
+"😁😂😃😄😅😆😇😈😉😊😋😌😍😎😏😐",
+"⠁⠂⠃⠄⠅⠆⠇⠈⠉⠊⠋⠌⠍⠎⠏",
+"🂡🂱🃁🃑",
+];
+
+text_2bytes = "Ленивый рыжий кот";
+text_4bytes = "🂡🂱🃁🃑";
+
+
+//Test all the normal accesses
+for (text_array_idx = [0:(len(texts_array)-1)])
+{
+	echo( "[", text_array_idx, "] = ", texts_array[text_array_idx], " of len=", len(texts_array[text_array_idx]), ":"  );
+    for (text_idx = [0:(len(texts_array[text_array_idx])-1)])
+    {
+	    echo( "    [", text_idx, ,"]=", texts_array[text_array_idx][text_idx]  );
+    }
+}
+
+//Test one past the last element of (x-byte unicode). This will be one past the length but inside the char length of the string
+echo( "Past end of unicode only 2-byte ", text_2bytes[len(text_2bytes)]  );
+echo( "Past end of unicode only 4-byte ", text_4bytes[len(text_4bytes)]  );
+
+//Test past the last element of (x-byte unicode). Outside both lengths.
+echo( "Past end of both 2-byte ", text_2bytes[ len(text_2bytes) * 2 ]   );
+echo( "Past end of both 4-byte ", text_4bytes[ len(text_4bytes) * 4 ]   );
+
+