Check for contextual anchors

googlefonts · Nov 1, 2023 · 554ac19 · 554ac19
1 parent 6a8b290
commit 554ac19
Showing 1 changed file with 16 additions and 0 deletions.
diff --git a/Lib/fontmake/compatibility.py b/Lib/fontmake/compatibility.py
@@ -46,6 +46,22 @@ def check_glyph(self, glyphs):
             anchors,
             "anchors",
         )
+        # Context for contextual anchors
+        libs = [g.lib for g in glyphs]
+        for ix, anchors in enumerate(zip(*anchors)):
+            if anchors[0].name[0] == "*":
+                objectlibs = [
+                    libs[font_ix]
+                    .get("public.objectLibs", {})
+                    .get(anchor.identifier, {})
+                    for font_ix, anchor in enumerate(anchors)
+                ]
+                with Context(self, f"anchor {anchors[0].name}"):
+                    self.ensure_all_same(
+                        lambda lib: lib.get("GPOS_Context", "None").strip(),
+                        objectlibs,
+                        "GPOS context",
+                    )
 
         components = [g.components for g in glyphs]
         if self.ensure_all_same(len, components, "number of components"):