add feature related functionality to auxlib

1 files changed, 102 insertions, 0 deletions

diff --git a/tests/pln-aux-2.tex b/tests/pln-aux-2.tex
new file mode 100644
index 0000000..62192a5
--- /dev/null
+++ b/tests/pln-aux-2.tex
@@ -0,0 +1,102 @@
+\input luaotfload.sty
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% script, features, and language
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\font\minionregular=file:MinionPro_Regular.otf  at 9pt
+\font\biolinum=file:LinBiolinum_R.otf  at 9pt
+\font\cmuregular=file:cmunrm.otf  at 9pt
+
+%% (1) luaotfload.aux.provides_script(font_id, script)
+%%      #1 defined font; #2 OT script tag
+\def\providesscript[#1][#2]{%
+  \bgroup#1%
+  let’s see whether \detokenize{#1} has script #2:
+  \directlua{
+    local aux = luaotfload.aux
+    local succ = aux.provides_script(font.current(), [[#2]])
+    if succ then tex.sprint"true" else tex.sprint"false" end
+  }%
+  \egroup
+  \endgraf%
+}
+
+\providesscript [\minionregular][latn]%% Latin
+\providesscript      [\biolinum][latn]
+\providesscript    [\cmuregular][latn]
+\providesscript [\minionregular][cyrl]%% Cyrillic
+\providesscript      [\biolinum][cyrl]
+\providesscript    [\cmuregular][cyrl]
+\providesscript [\minionregular][tibt]%% Tibetan
+\providesscript      [\biolinum][tibt]
+\providesscript    [\cmuregular][tibt]
+
+\hrule % --------------------------------------------------------------
+
+%% (2) luaotfload.aux.provides_language(font_id, script, language)
+%%      #1 defined font; #2 OT script tag; #3 OT language tag
+\def\provideslanguage[#1][#2][#3]{%
+  \bgroup#1%
+  let’s see whether \detokenize{#1} supports language #3 for script #2:
+  \directlua{
+    local aux = luaotfload.aux
+    local succ = aux.provides_language(font.current(), [[#2]], [[#3]])
+    if succ then tex.sprint"true" else tex.sprint"false" end
+  }%
+  \egroup
+  \endgraf%
+}
+
+\provideslanguage [\minionregular][latn][nld]%% Latin/Dutch
+\provideslanguage      [\biolinum][latn][nld]
+\provideslanguage    [\cmuregular][latn][nld]
+\provideslanguage [\minionregular][latn][deu]%% Latin/German
+\provideslanguage      [\biolinum][latn][deu]
+\provideslanguage    [\cmuregular][latn][deu]
+\provideslanguage [\minionregular][cyrl][rus]%% Cyrillic/Russian
+\provideslanguage      [\biolinum][cyrl][rus]
+\provideslanguage    [\cmuregular][cyrl][rus]
+\provideslanguage [\minionregular][cyrl][klm]%% Cyrillic/Kalmyk
+\provideslanguage      [\biolinum][cyrl][klm]
+\provideslanguage    [\cmuregular][cyrl][klm]
+\provideslanguage [\minionregular][cyrl][srb]%% Cyrillic/Serbian
+\provideslanguage      [\biolinum][cyrl][srb]
+\provideslanguage    [\cmuregular][cyrl][srb]
+\provideslanguage [\minionregular][tibt][tib]%% Tibetan
+\provideslanguage      [\biolinum][tibt][tib]
+\provideslanguage    [\cmuregular][tibt][tib]
+
+\hrule % --------------------------------------------------------------
+
+%% (3) luaotfload.aux.provides_feature(
+%%                      font_id, script, language, feature)
+%%      #1 defined font;    #2 OT script tag;
+%%      #3 OT language tag; #4 OT feature
+\def\providesfeature[#1][#2][#3][#4]{%this is getting ridiculous
+  \bgroup#1%
+  let’s see whether \detokenize{#1} supports feature #4 for the
+  combination of script #2 with language #3:
+  \directlua{
+    local aux = luaotfload.aux
+    local succ = aux.provides_feature(
+      font.current(), [[#2]], [[#3]], [[#4]])
+    if succ then tex.sprint"true" else tex.sprint"false" end
+  }%
+  \egroup
+  \endgraf%
+}
+
+\providesfeature [\minionregular][latn][nld][liga]%% Latin/Dutch
+\providesfeature      [\biolinum][latn][nld][liga]
+\providesfeature    [\cmuregular][latn][nld][liga]
+\providesfeature [\minionregular][latn][deu][liga]%% Latin/German
+\providesfeature      [\biolinum][latn][deu][liga]
+\providesfeature    [\cmuregular][latn][deu][liga]
+\providesfeature [\minionregular][cyrl][srb][liga]%% Cyrillic/Serbian
+\providesfeature      [\biolinum][cyrl][srb][liga]
+\providesfeature    [\cmuregular][cyrl][srb][liga]
+\providesfeature [\minionregular][tibt][tib][liga]%% Tibetan
+\providesfeature      [\biolinum][tibt][tib][liga]
+\providesfeature    [\cmuregular][tibt][tib][liga]
+
+\bye