+ # Print an error and suggest hints when the class identified by `qid` in `mmodule` is not found.
+ #
+ # This just print error messages.
+ fun class_not_found(qid: AQclassid, mmodule: MModule)
+ do
+ var name = qid.n_id.text
+ var qname = qid.full_name
+
+ if bad_class_names[mmodule].has(qname) then
+ error(qid, "Error: class `{qname}` not found in module `{mmodule}`.")
+ return
+ end
+ bad_class_names[mmodule].add(qname)
+
+ var all_classes = model.get_mclasses_by_name(name)
+ var hints = new Array[String]
+
+ # Look for conflicting classes.
+ if all_classes != null then for c in all_classes do
+ if not mmodule.is_visible(c.intro_mmodule, c.visibility) then continue
+ if not qid.accept(c) then continue
+ hints.add "`{c.full_name}`"
+ end
+ if hints.length > 1 then
+ error(qid, "Error: ambiguous class name `{qname}` in module `{mmodule}`. Conflicts are between {hints.join(",", " and ")}.")
+ return
+ end
+ hints.clear
+
+ # Look for imported but invisible classes.
+ if all_classes != null then for c in all_classes do
+ if not mmodule.in_importation <= c.intro_mmodule then continue
+ if mmodule.is_visible(c.intro_mmodule, c.visibility) then continue
+ if not qid.accept(c) then continue
+ error(qid, "Error: class `{c.full_name}` not visible in module `{mmodule}`.")
+ return
+ end
+
+ # Look for not imported but known classes from importable modules
+ if all_classes != null then for c in all_classes do
+ if mmodule.in_importation <= c.intro_mmodule then continue
+ if c.intro_mmodule.in_importation <= mmodule then continue
+ if c.visibility <= private_visibility then continue
+ if not qid.accept(c) then continue
+ hints.add "`{c.intro_mmodule.full_name}`"
+ end
+ if hints.not_empty then
+ error(qid, "Error: class `{qname}` not found in module `{mmodule}`. Maybe import {hints.join(",", " or ")}?")
+ return
+ end
+
+ # Look for classes with an approximative name.
+ var bests = new BestDistance[MClass](qname.length - name.length / 2) # limit up to 50% name change
+ for c in model.mclasses do
+ if not mmodule.in_importation <= c.intro_mmodule then continue
+ if not mmodule.is_visible(c.intro_mmodule, c.visibility) then continue
+ var d = qname.levenshtein_distance(c.name)
+ bests.update(d, c)
+ d = qname.levenshtein_distance(c.full_name)
+ bests.update(d, c)
+ end
+ if bests.best_items.not_empty then
+ for c in bests.best_items do hints.add "`{c.full_name}`"
+ error(qid, "Error: class `{qname}` not found in module `{mmodule}`. Did you mean {hints.join(",", " or ")}?")
+ return
+ end
+
+ error(qid, "Error: class `{qname}` not found in module `{mmodule}`.")
+ end
+
+ # List of already reported bad class names.
+ # Used to not perform and repeat hints again and again.
+ private var bad_class_names = new MultiHashMap[MModule, String]
+