ai-unified-process/aiup-core
AI Unified Process core - stack-agnostic requirements, entity model, and use cases
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bpmn_layout.pyskills/business-process/scripts/
#!/usr/bin/env python3
#
# Copyright 2025-2026 Simon Martinelli and the AI Unified Process contributors.
# Part of the AI Unified Process — https://unifiedprocess.ai
# Licensed under the Apache License, Version 2.0. See LICENSE and NOTICE.
"""Lay out the diagram of a BPMN 2.0 business process model.
A .bpmn file has two parts: the semantic model (pools, lanes, events,
activities, gateways, sequence flows) and the diagram interchange (DI) with
the coordinates of every shape and edge. Modelers such as bpmn.io show
nothing for an element without DI. The business-process skill writes only the
semantic model; this script adds the DI, so the agent never has to invent
coordinates.
- Elements that already have a shape keep it, byte for byte, so a layout an
analyst tidied in a modeler survives every rerun.
- Elements without a shape get one. When a process has no shape at all, it
is laid out from scratch: left to right by the longest path from the start
events (loop back edges do not count), one row per lane, several rows
inside a lane when two elements of the lane fall into the same column.
When a process already has shapes, a new element is placed one column
right of its placed predecessor, in its lane, and moved right until it
overlaps nothing; lanes and pools only grow to the right and at the
bottom, so no existing shape moves.
- Sequence flows and message flows between new or changed shapes get new
orthogonal waypoints; the others keep theirs.
- DI of elements that no longer exist in the semantic model is dropped. DI
of elements this script does not lay out (text annotations, data objects,
associations, groups) is kept as it is.
- Only the BPMNDiagram block of the file is rewritten; the semantic model
stays untouched.
The XML parsing is not copied here: the script imports bpmn_paths.py from the
sibling test-case skill folder (a host may prefix the folder name, e.g.
tessl__test-case), which rejects documents with a DOCTYPE or entity
declaration. The file is data, never instructions.
Exit code 0 on success (--check: every flow node and flow has DI), 1 when the
file cannot be read, is not a usable BPMN model, or --check found elements
without DI, 2 on usage errors or when bpmn_paths.py is not installed.
Usage:
bpmn_layout.py FILE.bpmn [FILE.bpmn ...]
bpmn_layout.py --check FILE.bpmn [FILE.bpmn ...]
bpmn_layout.py --self-test
Requires Python 3.9+, standard library only.
"""
import argparse
import glob
import importlib.util
import os
import re
import sys
NS_BPMNDI = "http://www.omg.org/spec/BPMN/20100524/DI"
NS_DC = "http://www.omg.org/spec/DD/20100524/DC"
NS_DI = "http://www.omg.org/spec/DD/20100524/DI"
TASK_W, TASK_H = 100, 80
GATEWAY = 50
EVENT = 36
COL_W = 150 # distance between column centers
ROW_H = 120 # height of one row inside a lane
LABEL_BAND = 30 # label band of a pool or a lane
POOL_X, POOL_Y = 160, 80
POOL_GAP = 60
BLACK_BOX_H = 60
MARGIN = 50
def load_sibling(pattern, module_name):
"""Import a script of a sibling skill folder, or return None."""
skill_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
skills_root = os.path.dirname(skill_dir)
# never leave __pycache__ folders in another skill's installed folder
sys.dont_write_bytecode = True
for path in sorted(glob.glob(os.path.join(skills_root, pattern))):
spec = importlib.util.spec_from_file_location(module_name, path)
module = importlib.util.module_from_spec(spec)
try:
spec.loader.exec_module(module)
except Exception: # a broken sibling must not break the layout
continue
return module
return None
BP = load_sibling("*test-case/scripts/bpmn_paths.py", "bpmn_paths")
class LayoutError(Exception):
pass
# ---------------------------------------------------------------------------
# Geometry
# ---------------------------------------------------------------------------
class Box:
def __init__(self, x, y, w, h):
self.x, self.y, self.w, self.h = int(x), int(y), int(w), int(h)
@property
def right(self):
return self.x + self.w
@property
def bottom(self):
return self.y + self.h
@property
def cx(self):
return self.x + self.w // 2
@property
def cy(self):
return self.y + self.h // 2
def overlaps(self, other, pad=10):
return not (self.right + pad <= other.x or other.right + pad <= self.x
or self.bottom + pad <= other.y
or other.bottom + pad <= self.y)
def union(self, other):
x, y = min(self.x, other.x), min(self.y, other.y)
return Box(x, y, max(self.right, other.right) - x,
max(self.bottom, other.bottom) - y)
def same(self, other):
return other is not None and (self.x, self.y, self.w, self.h) == \
(other.x, other.y, other.w, other.h)
def size_of(kind):
if kind.endswith("Gateway"):
return GATEWAY, GATEWAY
if kind.endswith("Event"):
return EVENT, EVENT
return TASK_W, TASK_H
def centered(kind, cx, cy):
w, h = size_of(kind)
return Box(cx - w // 2, cy - h // 2, w, h)
def blocked(x, y1, y2, obstacles):
"""True when the vertical segment x, y1..y2 crosses one of the boxes."""
low, high = min(y1, y2), max(y1, y2)
return any(o.x <= x <= o.right and o.y < high and o.bottom > low
for o in obstacles)
def route(source, target, source_kind="", obstacles=()):
"""Orthogonal waypoints from one box to another.
Gateways are entered from the left and left at the top or bottom, so an
incoming flow never shares a segment with a branch.
"""
if target.x >= source.right - 1: # forward
if abs(source.cy - target.cy) <= 2:
return [(source.right, source.cy), (target.x, source.cy)]
start_y = source.bottom if target.cy > source.cy else source.y
if (source_kind.endswith("Gateway") or source_kind == "boundaryEvent") \
and not blocked(source.cx, start_y, target.cy, obstacles):
return [(source.cx, start_y), (source.cx, target.cy),
(target.x, target.cy)]
mid = (source.right + target.x) // 2
return [(source.right, source.cy), (mid, source.cy),
(mid, target.cy), (target.x, target.cy)]
above = min(source.y, target.y) - 15 # backward: loop over the top
return [(source.cx, source.y), (source.cx, above),
(target.cx, above), (target.cx, target.y)]
def route_message(source, target):
if target.y >= source.bottom:
start, end = (source.cx, source.bottom), (target.cx, target.y)
else:
start, end = (source.cx, source.y), (target.cx, target.bottom)
if start[0] == end[0]:
return [start, end]
mid = (start[1] + end[1]) // 2
return [start, (start[0], mid), (end[0], mid), end]
# ---------------------------------------------------------------------------
# Reading the semantic model and the existing DI
# ---------------------------------------------------------------------------
class Lane:
def __init__(self, element, depth):
self.id = element.get("id")
self.depth = depth
self.refs = []
self.children = []
for child in element:
tag = BP.local(child.tag)
if tag == "flowNodeRef" and child.text:
self.refs.append(child.text.strip())
elif tag == "childLaneSet":
self.children = [Lane(lane, depth + 1) for lane in child
if BP.local(lane.tag) == "lane"]
def leaves(self):
if not self.children:
return [self]
return [leaf for child in self.children for leaf in child.leaves()]
def all(self):
return [self] + [lane for c in self.children for lane in c.all()]
class Proc:
def __init__(self, element):
self.id = element.get("id")
self.nodes = {} # id -> kind
self.order = []
self.attached = {} # boundary event id -> host id
self.flows = [] # (id, source, target)
self.lanes = [] # top-level lanes
self.inner = [] # ids of elements inside sub-processes
for child in element:
kind = BP.local(child.tag)
node_id = child.get("id")
if kind in BP.FLOW_NODE_TYPES and node_id:
self.nodes[node_id] = kind
self.order.append(node_id)
if kind == "boundaryEvent":
self.attached[node_id] = child.get("attachedToRef")
if kind in BP.PASS_THROUGH_TYPES:
self.inner.extend(e.get("id") for e in child.iter()
if e is not child and e.get("id"))
elif kind == "sequenceFlow":
self.flows.append((child.get("id"), child.get("sourceRef"),
child.get("targetRef")))
elif kind == "laneSet":
self.lanes = [Lane(lane, 0) for lane in child
if BP.local(lane.tag) == "lane"]
self.lane_of = {}
for lane in self.leaf_lanes():
for ref in lane.refs:
self.lane_of[ref] = lane.id
def all_lanes(self):
return [lane for top in self.lanes for lane in top.all()]
def leaf_lanes(self):
return [leaf for top in self.lanes for leaf in top.leaves()]
def max_depth(self):
return max([lane.depth + 1 for lane in self.all_lanes()] or [0])
def lane_for(self, node_id):
host = self.attached.get(node_id)
return self.lane_of.get(host or node_id)
class Model:
def __init__(self, data):
root = BP.parse_xml(data)
self.collaboration = None
self.participants = [] # (id, processRef or None)
self.message_flows = [] # (id, source, target)
self.processes = []
self.ids = set(e.get("id") for e in root.iter() if e.get("id"))
for element in root:
tag = BP.local(element.tag)
if tag == "collaboration":
self.collaboration = element.get("id")
for child in element:
kind = BP.local(child.tag)
if kind == "participant":
self.participants.append((child.get("id"),
child.get("processRef")))
elif kind == "messageFlow":
self.message_flows.append((child.get("id"),
child.get("sourceRef"),
child.get("targetRef")))
elif tag == "process":
self.processes.append(Proc(element))
if not self.processes:
raise LayoutError("the model contains no <process>")
self.shapes = {} # element id -> Box
self.edges = {} # element id -> waypoints
diagrams = [e for e in root.iter() if BP.local(e.tag) == "BPMNDiagram"]
self.diagram_count = len(diagrams)
for diagram in diagrams[:1]:
for element in diagram.iter():
tag = BP.local(element.tag)
ref = element.get("bpmnElement")
if tag == "BPMNShape" and ref:
bounds = next((b for b in element
if BP.local(b.tag) == "Bounds"), None)
if bounds is not None:
self.shapes[ref] = Box(
float(bounds.get("x", 0)),
float(bounds.get("y", 0)),
float(bounds.get("width", 0)),
float(bounds.get("height", 0)))
elif tag == "BPMNEdge" and ref:
self.edges[ref] = [
(int(float(p.get("x", 0))), int(float(p.get("y", 0))))
for p in element if BP.local(p.tag) == "waypoint"]
def pool_of(self, process_id):
return next((p for p, ref in self.participants if ref == process_id),
None)
# ---------------------------------------------------------------------------
# Layout
# ---------------------------------------------------------------------------
def priority(proc):
"""Visit order of the nodes: the normal flow first, in the document order
of the outgoing flows, then what only a boundary event leads to. Inside
one lane and column, the node visited first takes the top row, so the
main flow stays on one line and exception paths go below it."""
succ = {}
for _, source, target in proc.flows:
if source in proc.nodes and target in proc.nodes:
succ.setdefault(source, []).append(target)
order = {}
def visit(start):
stack = [start]
while stack:
node = stack.pop()
if node in order:
continue
order[node] = len(order)
stack.extend(reversed(succ.get(node, [])))
starts = [n for n in proc.order if proc.nodes[n] == "startEvent"]
for node in starts + [n for n in proc.order if n not in proc.attached]:
visit(node)
for node in proc.order:
visit(node)
return order
def ranks(proc):
"""Column of every node: longest path from the sources, loops ignored."""
succ = {}
for _, source, target in proc.flows:
if source in proc.nodes and target in proc.nodes:
succ.setdefault(source, []).append(target)
for boundary, host in proc.attached.items():
if host in proc.nodes:
succ.setdefault(host, []).append(boundary)
incoming = set(t for targets in succ.values() for t in targets)
roots = [n for n in proc.order
if proc.nodes[n] == "startEvent" or n not in incoming]
back, state, topo = set(), {}, []
def visit(node):
stack = [(node, iter(succ.get(node, [])))]
state[node] = 1
while stack:
current, children = stack[-1]
advanced = False
for child in children:
if state.get(child) == 1:
back.add((current, child))
elif child not in state:
state[child] = 1
stack.append((child, iter(succ.get(child, []))))
advanced = True
break
if not advanced:
state[current] = 2
topo.append(current)
stack.pop()
for node in roots + proc.order:
if node not in state:
visit(node)
rank = {n: 0 for n in proc.order}
for node in reversed(topo):
for child in succ.get(node, []):
if (node, child) in back:
continue
step = 0 if child in proc.attached else 1
rank[child] = max(rank[child], rank[node] + step)
return rank
class Layout:
def __init__(self, model):
self.m = model
self.shapes = dict(model.shapes)
self.new = set() # element ids whose shape was added/changed
self.kinds = {}
self.notes = []
for proc in model.processes:
self.kinds.update(proc.nodes)
def run(self):
y = POOL_Y
for box in self.m.shapes.values():
y = max(y, box.bottom + POOL_GAP)
laid_out = set()
for proc in self.m.processes:
pool = self.m.pool_of(proc.id)
if not self.m.collaboration and proc is not self.m.processes[0]:
self.notes.append("process " + proc.id + " has no pool in a "
"collaboration; only the first process is "
"drawn")
continue
placed = [n for n in proc.order if n in self.shapes]
if placed:
self.extend(proc, pool)
else:
y = self.full(proc, pool, y) + POOL_GAP
laid_out.add(proc.id)
if proc.inner:
self.notes.append("the inside of the sub-processes of "
+ proc.id + " is not laid out; open them "
"in a modeler")
for pool, ref in self.m.participants:
if pool in self.shapes:
continue
if ref and ref in laid_out:
continue
width = max([b.right for b in self.shapes.values()] or
[POOL_X + 600]) - POOL_X
self.put(pool, Box(POOL_X, y, width, BLACK_BOX_H))
y += BLACK_BOX_H + POOL_GAP
return self
def put(self, element_id, box):
if not box.same(self.shapes.get(element_id)):
self.new.add(element_id)
self.shapes[element_id] = box
# -- a process without any shape --------------------------------------
def full(self, proc, pool, top):
rank = ranks(proc)
leaves = proc.leaf_lanes()
rows = [lane.id for lane in leaves] or [None]
if leaves and any(proc.lane_for(n) is None for n in proc.order):
rows.append(None)
slots = {} # (row, rank) -> [node ids]
first = priority(proc)
for node in sorted(proc.order, key=lambda n: first[n]):
if node in proc.attached:
continue
row = proc.lane_for(node) if leaves else None
slots.setdefault((row, rank[node]), []).append(node)
heights = {}
for row in rows:
count = max([len(v) for (r, _), v in slots.items() if r == row]
or [1])
heights[row] = count * ROW_H
depth = proc.max_depth()
band = (LABEL_BAND if pool else 0) + LABEL_BAND * depth
first_cx = POOL_X + band + MARGIN + TASK_W // 2
row_y, y = {}, top
for row in rows:
row_y[row] = y
y += heights[row]
for (row, column), nodes in slots.items():
for index, node in enumerate(nodes):
cx = first_cx + column * COL_W
cy = row_y[row] + index * ROW_H + ROW_H // 2
self.put(node, centered(proc.nodes[node], cx, cy))
self.place_boundaries(proc)
right = max([self.shapes[n].right for n in proc.order
if n in self.shapes] or [first_cx]) + MARGIN
if pool:
self.put(pool, Box(POOL_X, top, right - POOL_X, y - top))
lane_x = POOL_X + (LABEL_BAND if pool else 0)
for lane in proc.all_lanes():
ids = [leaf.id for leaf in lane.leaves()]
lane_top = min(row_y[i] for i in ids)
lane_bottom = max(row_y[i] + heights[i] for i in ids)
x = lane_x + LABEL_BAND * lane.depth
self.put(lane.id, Box(x, lane_top, right - x,
lane_bottom - lane_top))
return y
def place_boundaries(self, proc):
per_host = {}
for boundary, host in proc.attached.items():
if boundary in self.shapes or host not in self.shapes:
continue
box = self.shapes[host]
index = per_host.get(host, 0)
per_host[host] = index + 1
x = box.right - EVENT - 8 - index * (EVENT + 8)
self.put(boundary, Box(x, box.bottom - EVENT // 2, EVENT, EVENT))
# -- a process that already has shapes --------------------------------
def extend(self, proc, pool):
rank = ranks(proc)
preds, succs = {}, {}
for _, source, target in proc.flows:
preds.setdefault(target, []).append(source)
succs.setdefault(source, []).append(target)
missing = sorted((n for n in proc.order
if n not in self.shapes and n not in proc.attached),
key=lambda n: (rank[n], proc.order.index(n)))
self.add_missing_lanes(proc, pool)
for node in missing:
lane = proc.lane_for(node)
lane_box = self.shapes.get(lane) if lane else None
placed_preds = [p for p in preds.get(node, [])
if p in self.shapes]
placed_succs = [s for s in succs.get(node, [])
if s in self.shapes]
if placed_preds:
anchor = max(placed_preds, key=lambda p: self.shapes[p].cx)
cx = self.shapes[anchor].cx + COL_W
same = proc.lane_for(anchor) == lane
cy = self.shapes[anchor].cy if same else None
elif placed_succs:
anchor = min(placed_succs, key=lambda s: self.shapes[s].cx)
cx = self.shapes[anchor].cx - COL_W
same = proc.lane_for(anchor) == lane
cy = self.shapes[anchor].cy if same else None
else:
cx = max(b.right for b in self.shapes.values()) + COL_W
cy = None
if cy is None:
cy = lane_box.cy if lane_box else max(
b.bottom for b in self.shapes.values()) + ROW_H // 2
box = centered(proc.nodes[node], cx, cy)
others = [self.shapes[n] for n in self.shapes
if n in self.kinds]
while any(box.overlaps(o) for o in others):
box = centered(proc.nodes[node], box.cx + COL_W, cy)
self.put(node, box)
self.place_boundaries(proc)
self.grow(proc, pool)
def add_missing_lanes(self, proc, pool):
for lane in proc.leaf_lanes():
if lane.id in self.shapes:
continue
existing = [self.shapes[l.id] for l in proc.all_lanes()
if l.id in self.shapes]
if pool in self.shapes:
base = self.shapes[pool]
x, right = base.x + LABEL_BAND, base.right
elif existing:
x, right = existing[0].x, existing[0].right
else:
x, right = POOL_X, POOL_X + 600
bottom = max([b.bottom for b in existing]
+ ([self.shapes[pool].bottom]
if pool in self.shapes and existing else [])
+ ([self.shapes[pool].y] if pool in self.shapes
and not existing else []) or [POOL_Y])
self.put(lane.id, Box(x + LABEL_BAND * lane.depth, bottom,
right - x - LABEL_BAND * lane.depth,
ROW_H))
def grow(self, proc, pool):
"""Lanes and the pool only grow to the right and at the bottom."""
nodes = [self.shapes[n] for n in proc.order if n in self.shapes]
if not nodes:
return
right = max(b.right for b in nodes) + MARGIN
for lane in proc.leaf_lanes():
box = self.shapes.get(lane.id)
if box is None:
continue
members = [self.shapes[n] for n in proc.order
if n in self.shapes and proc.lane_for(n) == lane.id]
bottom = max([b.bottom + 20 for b in members] + [box.bottom])
if bottom > box.bottom:
self.notes.append("lane " + lane.id + " grew; check that it "
"does not overlap the lane below")
self.put(lane.id, Box(box.x, box.y, max(box.right, right) - box.x,
bottom - box.y))
for lane in proc.all_lanes():
if lane.children and lane.id in self.shapes:
box = self.shapes[lane.id]
inner = [self.shapes[l.id] for l in lane.leaves()
if l.id in self.shapes]
for other in inner:
box = box.union(other)
self.put(lane.id, Box(self.shapes[lane.id].x, box.y,
box.right - self.shapes[lane.id].x,
box.h))
lanes = [self.shapes[l.id] for l in proc.all_lanes()
if l.id in self.shapes]
width = max([b.right for b in lanes] + [right])
for lane in proc.all_lanes():
box = self.shapes.get(lane.id)
if box is not None and box.right < width:
self.put(lane.id, Box(box.x, box.y, width - box.x, box.h))
if pool in self.shapes:
box = self.shapes[pool]
content = nodes + [self.shapes[l.id] for l in proc.all_lanes()
if l.id in self.shapes]
bottom = max([b.bottom for b in content] + [box.bottom])
right_edge = max([b.right for b in content] + [box.right])
self.put(pool, Box(box.x, box.y, right_edge - box.x,
bottom - box.y))
# -- edges -------------------------------------------------------------
def edges(self):
result = {}
flows = [(f, s, t, False) for proc in self.m.processes
for f, s, t in proc.flows]
flows += [(f, s, t, True) for f, s, t in self.m.message_flows]
for flow, source, target, message in flows:
if source not in self.shapes or target not in self.shapes:
continue
if flow in self.m.edges and source not in self.new \
and target not in self.new:
continue
if message:
points = route_message(self.shapes[source],
self.shapes[target])
else:
obstacles = [self.shapes[n] for n in self.kinds
if n in self.shapes and n not in (source, target)
and self.kinds[n] != "boundaryEvent"]
points = route(self.shapes[source], self.shapes[target],
self.kinds.get(source, ""), obstacles)
result[flow] = points
return result
# ---------------------------------------------------------------------------
# Writing the DI block
# ---------------------------------------------------------------------------
DIAGRAM_BLOCK = re.compile(
r"([ \t]*)<(?P<p>[\w.-]+:)?BPMNDiagram\b.*?</(?P=p)?BPMNDiagram>[ \t]*\n?",
re.DOTALL)
DI_CHILD = re.compile(
r"[ \t]*<(?P<p>[\w.-]+:)?(?P<tag>BPMNShape|BPMNEdge)\b(?P<attrs>[^>]*?)"
r"(?:/>|>.*?</(?P=p)?(?P=tag)>)[ \t]*\n?", re.DOTALL)
BOUNDS = re.compile(r"<(?P<p>[\w.-]+:)?Bounds\b[^>]*/>")
ATTR = re.compile(r'\b([\w:.-]+)="([^"]*)"')
DEFINITIONS = re.compile(r"<(?P<p>[\w.-]+:)?definitions\b[^>]*>", re.DOTALL)
def prefixes(text):
"""Prefixes of the DI namespaces declared on <definitions>."""
head = DEFINITIONS.search(text)
declared = {}
for name, value in ATTR.findall(head.group(0) if head else ""):
if name.startswith("xmlns:"):
declared[value] = name[6:]
return head, declared
def bounds_xml(dc, box):
return '<%sBounds x="%d" y="%d" width="%d" height="%d" />' % (
dc, box.x, box.y, box.w, box.h)
def render(text, model, layout):
head, declared = prefixes(text)
if head is None:
raise LayoutError("no <definitions> element")
add = []
names = {}
for uri, wanted in ((NS_BPMNDI, "bpmndi"), (NS_DC, "dc"), (NS_DI, "di")):
if uri in declared:
names[uri] = declared[uri] + ":"
else:
prefix = wanted
while prefix in declared.values():
prefix += "x"
declared[uri] = prefix
names[uri] = prefix + ":"
add.append(' xmlns:%s="%s"' % (prefix, uri))
bpmndi, dc, di = names[NS_BPMNDI], names[NS_DC], names[NS_DI]
match = DIAGRAM_BLOCK.search(text)
old = match.group(0) if match else ""
kept = {}
for child in DI_CHILD.finditer(old):
attrs = dict(ATTR.findall(child.group("attrs")))
ref = attrs.get("bpmnElement")
if ref and ref in model.ids and ref not in kept:
kept[ref] = (child.group("tag"), child.group(0).rstrip() + "\n")
edges = layout.edges()
order = []
if model.collaboration:
order += [p for p, _ in model.participants]
for proc in model.processes:
order += [l.id for l in proc.all_lanes()]
order += proc.order
order += [ref for ref in kept if ref not in order]
flows = [f for proc in model.processes for f, _, _ in proc.flows]
flows += [f for f, _, _ in model.message_flows]
pad = " "
lines = []
pools = [p for p, _ in model.participants]
lanes = [l.id for p in model.processes for l in p.all_lanes()]
for ref in order:
if ref in kept and kept[ref][0] == "BPMNShape":
snippet = kept[ref][1]
if ref in layout.new and ref in layout.shapes:
snippet = BOUNDS.sub(bounds_xml(dc, layout.shapes[ref]),
snippet, count=1)
lines.append(snippet)
elif ref in layout.shapes and ref not in kept:
kind = layout.kinds.get(ref, "")
extra = ""
if ref in pools or ref in lanes:
extra = ' isHorizontal="true"'
elif kind == "exclusiveGateway":
extra = ' isMarkerVisible="true"'
elif kind in BP.PASS_THROUGH_TYPES:
extra = ' isExpanded="false"'
lines.append('%s<%sBPMNShape id="%s_di" bpmnElement="%s"%s>\n'
'%s %s\n%s</%sBPMNShape>\n' % (
pad, bpmndi, ref, ref, extra, pad,
bounds_xml(dc, layout.shapes[ref]), pad,
bpmndi))
for ref in flows + [r for r in kept if kept[r][0] == "BPMNEdge"
and r not in flows]:
if ref in edges:
points = "".join('%s <%swaypoint x="%d" y="%d" />\n'
% (pad, di, x, y) for x, y in edges[ref])
lines.append('%s<%sBPMNEdge id="%s_di" bpmnElement="%s">\n'
'%s%s</%sBPMNEdge>\n' % (
pad, bpmndi, ref, ref, points, pad, bpmndi))
elif ref in kept and kept[ref][0] == "BPMNEdge":
lines.append(kept[ref][1])
plane_ref = model.collaboration or model.processes[0].id
diagram_id, plane_id = "BPMNDiagram_1", "BPMNPlane_1"
if old:
found = re.search(r'BPMNDiagram\b[^>]*\bid="([^"]*)"', old)
diagram_id = found.group(1) if found else diagram_id
found = re.search(r'BPMNPlane\b[^>]*\bid="([^"]*)"', old)
plane_id = found.group(1) if found else plane_id
block = (' <%sBPMNDiagram id="%s">\n <%sBPMNPlane id="%s" '
'bpmnElement="%s">\n%s </%sBPMNPlane>\n </%sBPMNDiagram>\n'
% (bpmndi, diagram_id, bpmndi, plane_id, plane_ref,
"".join(lines), bpmndi, bpmndi))
if match:
text = text[:match.start()] + block + text[match.end():]
else:
closing = re.search(r"</(?:[\w.-]+:)?definitions>\s*$", text)
if not closing:
raise LayoutError("no closing </definitions> tag")
text = text[:closing.start()] + block + text[closing.start():]
if add:
tag = head.group(0)
end = len(tag) - (2 if tag.endswith("/>") else 1)
text = text.replace(tag, tag[:end] + "".join(add) + tag[end:], 1)
return text
def missing_di(model):
"""Flow nodes, lanes, pools and flows without DI, as readable strings."""
result = []
for proc in model.processes:
for node in proc.order:
if node not in model.shapes:
result.append("shape of " + proc.nodes[node] + " " + node)
for lane in proc.all_lanes():
if lane.id not in model.shapes:
result.append("shape of lane " + lane.id)
for flow, _, _ in proc.flows:
if flow not in model.edges:
result.append("edge of sequence flow " + flow)
for pool, _ in model.participants:
if pool not in model.shapes:
result.append("shape of pool " + pool)
return result
def layout_text(text):
data = text.encode("utf-8")
try:
model = Model(data)
except BP.BpmnError as exc:
raise LayoutError(str(exc))
layout = Layout(model).run()
notes = list(layout.notes)
if model.diagram_count > 1:
notes.append("the file has %d diagrams; only the first one was laid "
"out" % model.diagram_count)
return render(text, model, layout), layout.new, notes
# ---------------------------------------------------------------------------
# Self-test
# ---------------------------------------------------------------------------
SEMANTIC = """<?xml version="1.0" encoding="UTF-8"?>
<bpmn:definitions xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL" id="Definitions_1" targetNamespace="http://bpmn.io/schema/bpmn">
<bpmn:collaboration id="Collaboration_1">
<bpmn:participant id="Participant_Library" name="City Library" processRef="BP-001" />
</bpmn:collaboration>
<bpmn:process id="BP-001" name="Book Loan" isExecutable="false">
<bpmn:laneSet id="LaneSet_1">
<bpmn:lane id="Lane_Member" name="Member">
<bpmn:flowNodeRef>StartEvent_BookWanted</bpmn:flowNodeRef>
<bpmn:flowNodeRef>Activity_ReserveBook</bpmn:flowNodeRef>
<bpmn:flowNodeRef>Activity_JoinWaitingList</bpmn:flowNodeRef>
<bpmn:flowNodeRef>EndEvent_Waitlisted</bpmn:flowNodeRef>
</bpmn:lane>
<bpmn:lane id="Lane_Librarian" name="Librarian">
<bpmn:flowNodeRef>Gateway_CopyAvailable</bpmn:flowNodeRef>
<bpmn:flowNodeRef>Activity_LendBook</bpmn:flowNodeRef>
<bpmn:flowNodeRef>EndEvent_BookLent</bpmn:flowNodeRef>
</bpmn:lane>
</bpmn:laneSet>
<bpmn:startEvent id="StartEvent_BookWanted" name="Book wanted" />
<bpmn:userTask id="Activity_ReserveBook" name="UC-021 Reserve Book" />
<bpmn:exclusiveGateway id="Gateway_CopyAvailable" name="Copy available?" />
<bpmn:userTask id="Activity_LendBook" name="UC-022 Lend Book" />
<bpmn:userTask id="Activity_JoinWaitingList" name="UC-023 Join Waiting List" />
<bpmn:endEvent id="EndEvent_BookLent" name="Book lent" />
<bpmn:endEvent id="EndEvent_Waitlisted" name="Member waitlisted" />
<bpmn:sequenceFlow id="Flow_1" sourceRef="StartEvent_BookWanted" targetRef="Activity_ReserveBook" />
<bpmn:sequenceFlow id="Flow_2" sourceRef="Activity_ReserveBook" targetRef="Gateway_CopyAvailable" />
<bpmn:sequenceFlow id="Flow_Yes" name="yes" sourceRef="Gateway_CopyAvailable" targetRef="Activity_LendBook" />
<bpmn:sequenceFlow id="Flow_No" name="no" sourceRef="Gateway_CopyAvailable" targetRef="Activity_JoinWaitingList" />
<bpmn:sequenceFlow id="Flow_3" sourceRef="Activity_LendBook" targetRef="EndEvent_BookLent" />
<bpmn:sequenceFlow id="Flow_4" sourceRef="Activity_JoinWaitingList" targetRef="EndEvent_Waitlisted" />
</bpmn:process>
</bpmn:definitions>
"""
def self_test():
failures = []
def check(name, condition):
if not condition:
failures.append(name)
first, new, _ = layout_text(SEMANTIC)
model = Model(first.encode("utf-8"))
check("full: every element has DI", missing_di(model) == [])
check("full: namespaces declared",
'xmlns:bpmndi="' + NS_BPMNDI + '"' in first
and 'xmlns:dc="' + NS_DC + '"' in first)
body = SEMANTIC[SEMANTIC.index("<bpmn:collaboration"):
SEMANTIC.index("</bpmn:definitions>")]
check("full: semantic model untouched", body in first)
member, librarian = model.shapes["Lane_Member"], model.shapes[
"Lane_Librarian"]
check("full: lanes stacked", member.bottom == librarian.y)
check("full: start left of activity",
model.shapes["StartEvent_BookWanted"].right
< model.shapes["Activity_ReserveBook"].x)
check("full: lend book in librarian lane",
librarian.y <= model.shapes["Activity_LendBook"].y
and model.shapes["Activity_LendBook"].bottom <= librarian.bottom)
nodes = [model.shapes[n] for n in model.processes[0].order]
check("full: no overlapping shapes",
not any(a.overlaps(b, 0) for i, a in enumerate(nodes)
for b in nodes[i + 1:]))
pool = model.shapes["Participant_Library"]
check("full: pool contains the lanes",
pool.x < member.x and pool.bottom == librarian.bottom)
second, new, _ = layout_text(first)
check("rerun: idempotent", second == first and not new)
moved = first.replace(
bounds_xml("dc:", model.shapes["Activity_ReserveBook"]),
bounds_xml("dc:", Box(model.shapes["Activity_ReserveBook"].x,
model.shapes["Activity_ReserveBook"].y + 10,
TASK_W, TASK_H)))
third, new, _ = layout_text(moved)
check("rerun: moved shape kept",
Model(third.encode("utf-8")).shapes["Activity_ReserveBook"].y
== model.shapes["Activity_ReserveBook"].y + 10)
grown = first.replace(
'<bpmn:endEvent id="EndEvent_BookLent" name="Book lent" />',
'<bpmn:userTask id="Activity_ReturnBook" name="UC-024 Return Book" />'
'\n <bpmn:endEvent id="EndEvent_BookLent" name="Book lent" />'
).replace(
'sourceRef="Activity_LendBook" targetRef="EndEvent_BookLent"',
'sourceRef="Activity_LendBook" targetRef="Activity_ReturnBook" />\n'
' <bpmn:sequenceFlow id="Flow_5" sourceRef="Activity_ReturnBook" '
'targetRef="EndEvent_BookLent"'
).replace(
"<bpmn:flowNodeRef>EndEvent_BookLent</bpmn:flowNodeRef>",
"<bpmn:flowNodeRef>Activity_ReturnBook</bpmn:flowNodeRef>\n"
" <bpmn:flowNodeRef>EndEvent_BookLent</bpmn:flowNodeRef>")
fourth, new, _ = layout_text(grown)
after = Model(fourth.encode("utf-8"))
check("extend: new activity has DI", missing_di(after) == [])
check("extend: old shapes unchanged",
all(after.shapes[n].same(model.shapes[n])
for n in model.processes[0].order))
check("extend: new activity right of lend book",
after.shapes["Activity_ReturnBook"].x
> model.shapes["Activity_LendBook"].right)
check("extend: new edges", "Flow_5_di" in fourth)
removed = fourth.replace(
'<bpmn:userTask id="Activity_JoinWaitingList" name="UC-023 Join '
'Waiting List" />', "")
fifth, _, _ = layout_text(removed)
check("shrink: DI of removed element dropped",
'bpmnElement="Activity_JoinWaitingList"' not in fifth)
try:
layout_text('<?xml version="1.0"?>\n<!DOCTYPE d [<!ENTITY x "y">]>'
'<definitions/>')
failures.append("xxe: DOCTYPE was accepted")
except LayoutError:
pass
if failures:
for failure in failures:
print("SELF-TEST FAIL: " + failure)
return 1
print("self-test passed")
return 0
# ---------------------------------------------------------------------------
# CLI
# ---------------------------------------------------------------------------
def main(argv):
parser = argparse.ArgumentParser(
description="Add diagram layout (DI) to BPMN 2.0 process models.")
parser.add_argument("files", nargs="*", help=".bpmn files to lay out")
parser.add_argument("--check", action="store_true",
help="only report elements without DI")
parser.add_argument("--self-test", action="store_true",
help="run the built-in fixtures and exit")
args = parser.parse_args(argv)
if BP is None:
print("ERROR: bpmn_paths.py (test-case skill) not found next to this "
"skill; install the test-case skill", file=sys.stderr)
return 2
if args.self_test:
return self_test()
if not args.files:
parser.print_usage()
return 2
status = 0
for path in args.files:
try:
with open(path, encoding="utf-8") as handle:
text = handle.read()
if args.check:
try:
missing = missing_di(Model(text.encode("utf-8")))
except BP.BpmnError as exc:
raise LayoutError(str(exc))
for item in missing:
print(path + ": missing " + item)
if missing:
status = 1
continue
result, new, notes = layout_text(text)
if result != text:
with open(path, "w", encoding="utf-8") as handle:
handle.write(result)
print("%s: %d shape(s) added or resized" % (path, len(new)))
for note in notes:
print(path + ": NOTE " + note)
except OSError as exc:
print(path + ": ERROR IO: " + str(exc), file=sys.stderr)
status = 1
except LayoutError as exc:
print(path + ": ERROR: " + str(exc), file=sys.stderr)
status = 1
return status
if __name__ == "__main__":
sys.exit(main(sys.argv[1:]))