/
grammar.bgf
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/
grammar.bgf
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<?xml version="1.0" encoding="UTF-8"?>
<xns1:grammar xmlns:xns1="http://planet-sl.org/bgf">
<xns1:production>
<nonterminal>graph</nonterminal>
<xns1:expression>
<sequence>
<xns1:expression>
<optional>
<xns1:expression>
<terminal>strict</terminal>
</xns1:expression>
</optional>
</xns1:expression>
<xns1:expression>
<choice>
<xns1:expression>
<terminal>graph</terminal>
</xns1:expression>
<xns1:expression>
<terminal>digraph</terminal>
</xns1:expression>
</choice>
</xns1:expression>
<xns1:expression>
<optional>
<xns1:expression>
<nonterminal>ID</nonterminal>
</xns1:expression>
</optional>
</xns1:expression>
<xns1:expression>
<terminal>{</terminal>
</xns1:expression>
<xns1:expression>
<nonterminal>stmt_list</nonterminal>
</xns1:expression>
<xns1:expression>
<terminal>}</terminal>
</xns1:expression>
</sequence>
</xns1:expression>
</xns1:production>
<xns1:production>
<nonterminal>stmt_list</nonterminal>
<xns1:expression>
<optional>
<xns1:expression>
<sequence>
<xns1:expression>
<nonterminal>stmt</nonterminal>
</xns1:expression>
<xns1:expression>
<optional>
<xns1:expression>
<terminal>;</terminal>
</xns1:expression>
</optional>
</xns1:expression>
<xns1:expression>
<optional>
<xns1:expression>
<nonterminal>stmt_list</nonterminal>
</xns1:expression>
</optional>
</xns1:expression>
</sequence>
</xns1:expression>
</optional>
</xns1:expression>
</xns1:production>
<xns1:production>
<nonterminal>stmt</nonterminal>
<xns1:expression>
<choice>
<xns1:expression>
<nonterminal>node_stmt</nonterminal>
</xns1:expression>
<xns1:expression>
<nonterminal>edge_stmt</nonterminal>
</xns1:expression>
<xns1:expression>
<nonterminal>attr_stmt</nonterminal>
</xns1:expression>
<xns1:expression>
<sequence>
<xns1:expression>
<nonterminal>ID</nonterminal>
</xns1:expression>
<xns1:expression>
<terminal>=</terminal>
</xns1:expression>
<xns1:expression>
<nonterminal>ID</nonterminal>
</xns1:expression>
</sequence>
</xns1:expression>
<xns1:expression>
<nonterminal>subgraph</nonterminal>
</xns1:expression>
</choice>
</xns1:expression>
</xns1:production>
<xns1:production>
<nonterminal>attr_stmt</nonterminal>
<xns1:expression>
<sequence>
<xns1:expression>
<choice>
<xns1:expression>
<terminal>graph</terminal>
</xns1:expression>
<xns1:expression>
<terminal>node</terminal>
</xns1:expression>
<xns1:expression>
<terminal>edge</terminal>
</xns1:expression>
</choice>
</xns1:expression>
<xns1:expression>
<nonterminal>attr_list</nonterminal>
</xns1:expression>
</sequence>
</xns1:expression>
</xns1:production>
<xns1:production>
<nonterminal>attr_list</nonterminal>
<xns1:expression>
<sequence>
<xns1:expression>
<terminal>[</terminal>
</xns1:expression>
<xns1:expression>
<optional>
<xns1:expression>
<nonterminal>a_list</nonterminal>
</xns1:expression>
</optional>
</xns1:expression>
<xns1:expression>
<terminal>]</terminal>
</xns1:expression>
<xns1:expression>
<optional>
<xns1:expression>
<nonterminal>attr_list</nonterminal>
</xns1:expression>
</optional>
</xns1:expression>
</sequence>
</xns1:expression>
</xns1:production>
<xns1:production>
<nonterminal>a_list</nonterminal>
<xns1:expression>
<sequence>
<xns1:expression>
<nonterminal>ID</nonterminal>
</xns1:expression>
<xns1:expression>
<optional>
<xns1:expression>
<sequence>
<xns1:expression>
<terminal>=</terminal>
</xns1:expression>
<xns1:expression>
<nonterminal>ID</nonterminal>
</xns1:expression>
</sequence>
</xns1:expression>
</optional>
</xns1:expression>
<xns1:expression>
<optional>
<xns1:expression>
<terminal>,</terminal>
</xns1:expression>
</optional>
</xns1:expression>
<xns1:expression>
<optional>
<xns1:expression>
<nonterminal>a_list</nonterminal>
</xns1:expression>
</optional>
</xns1:expression>
</sequence>
</xns1:expression>
</xns1:production>
<xns1:production>
<nonterminal>edge_stmt</nonterminal>
<xns1:expression>
<sequence>
<xns1:expression>
<choice>
<xns1:expression>
<nonterminal>node_id</nonterminal>
</xns1:expression>
<xns1:expression>
<nonterminal>subgraph</nonterminal>
</xns1:expression>
</choice>
</xns1:expression>
<xns1:expression>
<nonterminal>edgeRHS</nonterminal>
</xns1:expression>
<xns1:expression>
<optional>
<xns1:expression>
<nonterminal>attr_list</nonterminal>
</xns1:expression>
</optional>
</xns1:expression>
</sequence>
</xns1:expression>
</xns1:production>
<xns1:production>
<nonterminal>edgeRHS</nonterminal>
<xns1:expression>
<sequence>
<xns1:expression>
<nonterminal>edgeop</nonterminal>
</xns1:expression>
<xns1:expression>
<choice>
<xns1:expression>
<nonterminal>node_id</nonterminal>
</xns1:expression>
<xns1:expression>
<nonterminal>subgraph</nonterminal>
</xns1:expression>
</choice>
</xns1:expression>
<xns1:expression>
<optional>
<xns1:expression>
<nonterminal>edgeRHS</nonterminal>
</xns1:expression>
</optional>
</xns1:expression>
</sequence>
</xns1:expression>
</xns1:production>
<xns1:production>
<nonterminal>node_stmt</nonterminal>
<xns1:expression>
<sequence>
<xns1:expression>
<nonterminal>node_id</nonterminal>
</xns1:expression>
<xns1:expression>
<optional>
<xns1:expression>
<nonterminal>attr_list</nonterminal>
</xns1:expression>
</optional>
</xns1:expression>
</sequence>
</xns1:expression>
</xns1:production>
<xns1:production>
<nonterminal>node_id</nonterminal>
<xns1:expression>
<sequence>
<xns1:expression>
<nonterminal>ID</nonterminal>
</xns1:expression>
<xns1:expression>
<optional>
<xns1:expression>
<nonterminal>port</nonterminal>
</xns1:expression>
</optional>
</xns1:expression>
</sequence>
</xns1:expression>
</xns1:production>
<xns1:production>
<nonterminal>port</nonterminal>
<xns1:expression>
<choice>
<xns1:expression>
<sequence>
<xns1:expression>
<terminal>:</terminal>
</xns1:expression>
<xns1:expression>
<nonterminal>ID</nonterminal>
</xns1:expression>
<xns1:expression>
<optional>
<xns1:expression>
<sequence>
<xns1:expression>
<terminal>:</terminal>
</xns1:expression>
<xns1:expression>
<nonterminal>compass_pt</nonterminal>
</xns1:expression>
</sequence>
</xns1:expression>
</optional>
</xns1:expression>
</sequence>
</xns1:expression>
<xns1:expression>
<sequence>
<xns1:expression>
<terminal>:</terminal>
</xns1:expression>
<xns1:expression>
<nonterminal>compass_pt</nonterminal>
</xns1:expression>
</sequence>
</xns1:expression>
</choice>
</xns1:expression>
</xns1:production>
<xns1:production>
<nonterminal>subgraph</nonterminal>
<xns1:expression>
<sequence>
<xns1:expression>
<optional>
<xns1:expression>
<sequence>
<xns1:expression>
<nonterminal>subgraph</nonterminal>
</xns1:expression>
<xns1:expression>
<optional>
<xns1:expression>
<nonterminal>ID</nonterminal>
</xns1:expression>
</optional>
</xns1:expression>
</sequence>
</xns1:expression>
</optional>
</xns1:expression>
<xns1:expression>
<terminal>{</terminal>
</xns1:expression>
<xns1:expression>
<nonterminal>stmt_list</nonterminal>
</xns1:expression>
<xns1:expression>
<terminal>}</terminal>
</xns1:expression>
</sequence>
</xns1:expression>
</xns1:production>
<xns1:production>
<nonterminal>compass_pt</nonterminal>
<xns1:expression>
<choice>
<xns1:expression>
<terminal>n</terminal>
</xns1:expression>
<xns1:expression>
<terminal>ne</terminal>
</xns1:expression>
<xns1:expression>
<terminal>e</terminal>
</xns1:expression>
<xns1:expression>
<terminal>se</terminal>
</xns1:expression>
<xns1:expression>
<terminal>s</terminal>
</xns1:expression>
<xns1:expression>
<terminal>sw</terminal>
</xns1:expression>
<xns1:expression>
<terminal>w</terminal>
</xns1:expression>
<xns1:expression>
<terminal>nw</terminal>
</xns1:expression>
<xns1:expression>
<terminal>c</terminal>
</xns1:expression>
<xns1:expression>
<terminal>_</terminal>
</xns1:expression>
</choice>
</xns1:expression>
</xns1:production>
</xns1:grammar>