46 lines
1.7 KiB
Python
46 lines
1.7 KiB
Python
from api.od import ODAPI
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from concrete_syntax.graphviz.make_url import show_graphviz
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try:
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import graphviz
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HAVE_GRAPHVIZ = True
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except ImportError:
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HAVE_GRAPHVIZ = False
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def render_tokens(num_tokens: int):
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if 0 <= num_tokens <= 3:
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return '●'*num_tokens
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if num_tokens == 4:
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return '●●\\n●●'
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return str(num_tokens)
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def render_petri_net(od: ODAPI):
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dot = ""
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dot += "rankdir=LR;"
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dot += "center=true;"
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dot += "margin=1;"
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dot += "nodesep=1;"
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dot += "edge [arrowhead=vee];"
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dot += "node[fontname=Arial,fontsize=10];\n"
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dot += "subgraph places {"
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dot += " node [shape=circle,fixedsize=true,label=\"\", height=.35,width=.35];"
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for _, place in od.get_all_instances("PNPlace"):
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place_name = od.get_name(place)
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try:
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place_state = od.get_source(od.get_incoming(place, "pn_of")[0])
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num_tokens = od.get_slot_value(place_state, "numTokens")
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except IndexError:
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num_tokens = 0
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dot += f" {place_name} [label=\"{place_name}\\n\\n{render_tokens(num_tokens)}\\n\\n\"];\n"
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dot += "}\n"
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dot += "subgraph transitions {"
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dot += " node [shape=rect,fixedsize=true,height=.3,width=.12,style=filled,fillcolor=black,color=white];\n"
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for transition_name, _ in od.get_all_instances("PNTransition"):
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dot += f" {transition_name} [label=\"{transition_name}\\n\\n\\n\"];\n"
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dot += "}\n"
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for _, arc in od.get_all_instances("arc"):
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src_name = od.get_name(od.get_source(arc))
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tgt_name = od.get_name(od.get_target(arc))
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dot += f"{src_name} -> {tgt_name};"
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show_graphviz(dot, engine="neato")
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return ""
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