--- /dev/null
+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Render various graph from a model.
+module api_graph
+
+import web_base
+import dot
+import uml
+
+# Group all api handlers in one router.
+class APIGraphRouter
+ super Router
+
+ # Model to pass to handlers.
+ var model: Model
+
+ # Mainmodule to pass to handlers.
+ var mainmodule: MModule
+
+ init do
+ use("/inheritance/:id", new APIInheritanceGraph(model, mainmodule))
+ end
+end
+
+# Render a hierarchy graph for `mentity` if any.
+class APIInheritanceGraph
+ super APIHandler
+
+ redef fun get(req, res) do
+ var pdepth = req.int_arg("pdepth")
+ var cdepth = req.int_arg("cdepth")
+ var mentity = mentity_from_uri(req, res)
+ if mentity == null then
+ res.error 404
+ return
+ end
+ var g = new InheritanceGraph(mentity, view)
+ res.send g.draw(pdepth, cdepth).to_svg
+ end
+end
+
+# Graph for mentity hierarchies
+#
+# Recursively build parents and children list from a `center`.
+class InheritanceGraph
+ super ModelVisitor
+
+ # MEntity at the center of this graph
+ var center: MEntity
+
+ # ModelView used to filter graph
+ var view: ModelView
+
+ # Graph generated
+ var graph: DotGraph is lazy do
+ var graph = new DotGraph("package_diagram", "digraph")
+
+ graph["compound"] = "true"
+ graph["rankdir"] = "BT"
+ graph["ranksep"] = 0.3
+ graph["nodesep"] = 0.3
+
+ graph.nodes_attrs["margin"] = 0.1
+ graph.nodes_attrs["width"] = 0
+ graph.nodes_attrs["height"] = 0
+ graph.nodes_attrs["fontsize"] = 10
+ graph.nodes_attrs["fontname"] = "helvetica"
+
+ graph.edges_attrs["dir"] = "none"
+ graph.edges_attrs["color"] = "gray"
+
+ return graph
+ end
+
+ # Build the graph
+ fun draw(parents_depth, children_depth: nullable Int): DotGraph do
+ draw_node center
+ draw_parents(center, parents_depth)
+ draw_children(center, children_depth)
+ return graph
+ end
+
+ private var nodes = new HashMap[MEntity, DotElement]
+ private var done_parents = new HashSet[MEntity]
+ private var done_children = new HashSet[MEntity]
+
+ # Recursively draw parents of mentity
+ fun draw_parents(mentity: MEntity, max_depth: nullable Int, current_depth: nullable Int) do
+ if done_parents.has(mentity) then return
+ done_parents.add mentity
+ current_depth = current_depth or else 0
+ if max_depth != null and current_depth >= max_depth then
+ from_dotdotdot(mentity)
+ return
+ end
+ var parents = mentity.collect_parents(view)
+ if parents.length > 10 then
+ from_dotdotdot(mentity)
+ return
+ end
+ for parent in parents do
+ if parent isa MModule then
+ var mgroup = parent.mgroup
+ if mgroup != null and mgroup.default_mmodule == parent then parent = mgroup
+ end
+ if parent isa MGroup then
+ if parent.mpackage.mgroups.first == parent then parent = parent.mpackage
+ end
+ draw_edge(mentity, parent)
+ end
+ for parent in parents do
+ if parent isa MModule then
+ var mgroup = parent.mgroup
+ if mgroup != null and mgroup.default_mmodule == parent then parent = mgroup
+ end
+ if parent isa MGroup then
+ if parent.mpackage.mgroups.first == parent then parent = parent.mpackage
+ end
+ draw_parents(parent, max_depth, current_depth + 1)
+ end
+ end
+
+ # Recursively draw children of mentity
+ fun draw_children(mentity: MEntity, max_depth: nullable Int, current_depth: nullable Int) do
+ if done_children.has(mentity) then return
+ done_children.add mentity
+ current_depth = current_depth or else 0
+ if max_depth != null and current_depth >= max_depth then
+ to_dotdotdot(mentity)
+ return
+ end
+ var children = mentity.collect_children(view)
+ if children.length > 10 then
+ to_dotdotdot(mentity)
+ return
+ end
+ for child in children do
+ if child isa MGroup then
+ if child.mpackage.mgroups.first == child then child = child.mpackage
+ end
+ draw_edge(child, mentity)
+ end
+ for child in children do
+ if child isa MGroup then
+ if child.mpackage.mgroups.first == child then child = child.mpackage
+ end
+ draw_children(child, max_depth, current_depth + 1)
+ end
+ end
+
+ # Draw a node from a `mentity`
+ fun draw_node(mentity: MEntity): DotElement do
+ if nodes.has_key(mentity) then return nodes[mentity]
+ var node: DotElement = mentity.to_dot_node
+ if mentity == center then node = highlight(node)
+ nodes[mentity] = node
+ graph.add node
+ return node
+ end
+
+ private var edges = new HashMap2[MEntity, MEntity, DotEdge]
+
+ # Draw a edges between two mentities
+ fun draw_edge(from, to: MEntity): DotEdge do
+ if edges.has(from, to) then return edges[from, to].as(not null)
+ if edges.has(to, from) then return edges[to, from].as(not null)
+ var nfrom = draw_node(from)
+ var nto = draw_node(to)
+ var edge = new DotEdge(nfrom, nto)
+ edges[from, to] = edge
+ graph.add edge
+ return edge
+ end
+
+ private var to_dots = new HashMap[MEntity, DotElement]
+
+ # Create a link from `mentity` to a `...` node
+ fun to_dotdotdot(mentity: MEntity): DotEdge do
+ var nto = draw_node(mentity)
+ var dots = to_dots.get_or_null(mentity)
+ if dots == null then
+ dots = dotdotdot("{nto.id}...")
+ to_dots[mentity] = dots
+ end
+ graph.add dots
+ var edge = new DotEdge(dots, nto)
+ graph.add edge
+ return edge
+ end
+
+ private var from_dots = new HashMap[MEntity, DotElement]
+
+ # Create a link from a `...` node to a `mentity`
+ fun from_dotdotdot(mentity: MEntity): DotEdge do
+ var nfrom = draw_node(mentity)
+ var dots = to_dots.get_or_null(mentity)
+ if dots == null then
+ dots = dotdotdot("...{nfrom.id}")
+ from_dots[mentity] = dots
+ end
+ graph.add dots
+ var edge = new DotEdge(dots, nfrom)
+ graph.add edge
+ return edge
+ end
+
+ # Change the border color of the node
+ fun highlight(dot: DotElement): DotElement do
+ dot["color"] = "#1E9431"
+ return dot
+ end
+
+ # Generate a `...` node
+ fun dotdotdot(id: String): DotNode do
+ var node = new DotNode(id)
+ node["label"] = "..."
+ node["shape"] = "none"
+ return node
+ end
+end
+
+redef class MEntity
+ private fun to_dot_node: DotNode do
+ var node = new DotNode(full_name)
+ node["URL"] = web_url
+ node["label"] = name
+ return node
+ end
+end
+
+redef class MPackage
+ redef fun to_dot_node do
+ var node = super
+ node["shape"] = "tab"
+ return node
+ end
+end
+
+redef class MGroup
+ redef fun to_dot_node do
+ var node = super
+ node["shape"] = "folder"
+ return node
+ end
+end
+
+redef class MModule
+ redef fun to_dot_node do
+ var node = super
+ node["shape"] = "note"
+ return node
+ end
+end
+
+redef class MClass
+ redef fun to_dot_node do
+ var node = super
+ node["shape"] = "box"
+ return node
+ end
+end
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