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module lang::dot::\syntax::Dot

rascal-0.40.16

Usage​

import lang::dot::\syntax::Dot;

syntax DOT​

start syntax DOT = Graph  Id "{" StatementList "}" "\n"?;

syntax Reserved​

keyword Reserved 
  = "graph" 
  | "digraph" 
  | "node" 
  | "edge" 
  | "subgraph"
  ;

syntax Graph​

syntax Graph 
  = "graph" 
  | "digraph" 
  | AttrTag
  ;

syntax AttrTag​

syntax AttrTag 
  = "node" 
  | "edge" 
  | "graph"
  ;

syntax Nod​

syntax Nod 
  = NodeId
  | Subgraph
  ;

syntax Id​

lexical Id 
  = ([A-Z a-z 0-9 _] !<< [a-z A-Z 0-9 _][a-z A-Z 0-9 _]* !>> [0-9 A-Z _ a-z]) \ Reserved 
  | [\"] (![\"] | "\\\"")* [\"]
  | [\-]? "." [0-9]+
  | [\-]? [0-9]+ "." [0-9]*
  ;

syntax StatementList​

syntax StatementList = StatementOptional*;

syntax Statement​

syntax Statement 
  = NodeStatement
  | EdgeStatement
  | AttrStatement  
  | Id "=" Id
  ;

syntax StatementOptional​

syntax StatementOptional = Statement ";"?;

syntax NodeStatement​

syntax NodeStatement = Nod AttrList;

syntax EdgeStatement​

syntax EdgeStatement = Nod EdgeRhs AttrList ;

syntax Edg​

syntax Edg =  EdgeOp Nod;

syntax EdgeOp​

syntax EdgeOp = "-\>" | "--";

syntax EdgeRhs​

syntax EdgeRhs = Edg+;

syntax NodeId​

syntax NodeId 
  = Id 
  | Id Port
  ;

syntax Port​

syntax Port = ":" Id Id?
//          | ":" Id
//          | ":" CompassPt
            ;

syntax AttrList​

syntax AttrList =   AttrList0*;

syntax AttrList0​

syntax AttrList0 =  "[" DotAttr* "]";

syntax DotAttr​

syntax DotAttr = Id "=" Id | Id "=" Id "," ;

syntax AttrStatement​

syntax AttrStatement = AttrTag AttrList;

syntax Subgraph​

syntax Subgraph = ("subgraph" Id? )?  "{" StatementList "}";

syntax Comment​

lexical Comment = "/*" (![*] | [*] !>> "/")* "*/"
                | "//" ![\n]* $
                ;

syntax LAYOUTLIST​

layout LAYOUTLIST = LAYOUT* !>> [\ \t\n\r] !>> "//" !>> "/*"
                    ;

syntax LAYOUT​

lexical LAYOUT = Whitespace: [\ \t\n\r] 
               | @category="Comment" Comment
               ;