X-Git-Url: http://nitlanguage.org

diff --git a/src/annotation.nit b/src/annotation.nit
index 4daafef..6641280 100644
--- a/src/annotation.nit
+++ b/src/annotation.nit
@@ -15,9 +15,40 @@
 # Management and utilities on annotations
 module annotation
 
-import parser
 import modelbuilder
-import literal
+private import literal
+import model::mmodule_data
+
+redef class Prod
+	super ANode
+
+	# Try to get its single annotation with a given name
+	# If there is no such an annotation, null is returned.
+	# If there is more than one annotation, a error message is printed and the first annotation is returned
+	fun get_single_annotation(name: String, modelbuilder: ModelBuilder): nullable AAnnotation
+	do
+		var res = get_annotations(name)
+		if res.is_empty then return null
+		if res.length > 1 then
+			modelbuilder.error(res[1], "Error: multiple annotation `{name}`. A previous one is defined line {res[0].location.line_start}")
+		end
+		return res.first
+	end
+
+	# Return all its annotations of a given name in the order of their declaration
+	# Retun an empty array if no such an annotation.
+	fun get_annotations(name: String): Array[AAnnotation]
+	do
+		var res = new Array[AAnnotation]
+		var nas = n_annotations
+		if nas == null then return res
+		for na in nas.n_items do
+			if na.name != name then continue
+			res.add(na)
+		end
+		return res
+	end
+end
 
 redef class AAnnotation
 	# The name of the annotation
@@ -53,6 +84,20 @@ redef class AAnnotation
 		modelbuilder.error(self, "Annotation error: \"{name}\" expects a single Int as argument.")
 		return null
 	end
+
+	# Get the single argument of `self` as an identifier.
+	# Raise error and return null on any inconsistency.
+	fun arg_as_id(modelbuilder: ModelBuilder): nullable String
+	do
+		var args = n_args
+		if args.length == 1 then
+			var arg = args.first.as_id
+			if arg != null then return arg
+		end
+
+		modelbuilder.error(self, "Annotation error: \"{name}\" expects a single identifier as argument.")
+		return null
+	end
 end
 
 redef class AAtArg
@@ -88,3 +133,71 @@ redef class AAtArg
 		return nexpr.n_id.text
 	end
 end
+
+redef class ModelBuilder
+	# Collect all annotations by `name` assocated to `mmodule` and its imported modules.
+	# Note that visibility is not considered.
+	fun collect_annotations_on_modules(name: String, mmodule: MModule): Array[AAnnotation]
+	do
+		var annotations = new Array[AAnnotation]
+		for mmod in mmodule.in_importation.greaters do
+			if not mmodule2nmodule.keys.has(mmod) then continue
+			var amod = mmodule2nmodule[mmod]
+			var module_decl = amod.n_moduledecl
+			if module_decl == null then continue
+			var aas = module_decl.get_annotations(name)
+			annotations.add_all aas
+		end
+		return annotations
+	end
+
+	# Return the single annotation `name` locally assocated to `mmodule`, if any.
+	# Obviously, if there is no ast associated to `mmodule`, then nothing is returned.
+	fun get_mmodule_annotation(name: String, mmodule: MModule): nullable AAnnotation
+	do
+		if not mmodule2nmodule.keys.has(mmodule) then return null
+		var amod = mmodule2nmodule[mmodule]
+		var module_decl = amod.n_moduledecl
+		if module_decl == null then return null
+		var res = module_decl.get_single_annotation(name, self)
+		return res
+	end
+
+	private var collect_annotations_data_cache = new HashMap[String, MModuleData[AAnnotation]]
+
+	# Collect all annotations by `name` in `mmodule` and its importations (direct and indirect)
+	# Note that visibility is not considered.
+	fun collect_annotations_data(name: String, mmodule: MModule): MModuleData[AAnnotation]
+	do
+		var res = collect_annotations_data_cache.get_or_null(name)
+		if res == null then
+			res = new MModuleData[AAnnotation](model)
+			collect_annotations_data_cache[name] = res
+		end
+
+		for mmod in mmodule.in_importation.greaters do
+			if res.has_mmodule(mmod) then continue
+			var ass = get_mmodule_annotation(name, mmod)
+			if ass == null then continue
+			res[mmod] = ass
+		end
+		return res
+	end
+
+	# Get an annotation by name from `mmodule` and its super modules. Will recursively search
+	# in imported module to find the "latest" declaration and detects priority conflicts.
+	fun lookup_annotation_on_modules(name: String, mmodule: MModule): nullable AAnnotation
+	do
+		var data = collect_annotations_data(name, mmodule)
+		var annotations = data.lookup_values(mmodule, none_visibility)
+		if annotations.is_empty then return null
+		if annotations.length > 1 then
+			var locs = new Array[Location]
+			for annot in annotations do locs.add(annot.location)
+
+			toolcontext.error(mmodule.location,
+				"Priority conflict on annotation {name}, it has been defined in: {locs.join(", ")}")
+		end
+		return annotations.first
+	end
+end