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| 1 | +// Simplified DOT grammar |
| 2 | +// |
| 3 | +// Not supported (yet): |
| 4 | +// |
| 5 | +// * HTML IDs |
| 6 | + |
| 7 | +{ |
| 8 | + function merge(a, b, key) { |
| 9 | + |
| 10 | + function x(a) { |
| 11 | + a.forEach(function (b) { |
| 12 | + if (!(b[key] in obj)) { |
| 13 | + obj[b[key]] = obj[b[key]] || {}; |
| 14 | + array.push(obj[b[key]]); |
| 15 | + } |
| 16 | + Object.keys(b).forEach(function (k) { |
| 17 | + obj[b[key]][k] = b[k]; |
| 18 | + }); |
| 19 | + }); |
| 20 | + } |
| 21 | + |
| 22 | + var array = [], |
| 23 | + obj = {}; |
| 24 | + |
| 25 | + x(a); |
| 26 | + x(b); |
| 27 | + return array; |
| 28 | + } |
| 29 | + |
| 30 | + var directed; |
| 31 | +} |
| 32 | + |
| 33 | +start |
| 34 | + = graphStmt+ |
| 35 | + |
| 36 | +graphStmt |
| 37 | + = _* strict:(strict _)? type:graphType _* id:(id)? _* '{' _* stmts:stmtList? _* '}' _* { |
| 38 | + return {type: type, id: id, strict: strict !== null, stmts: stmts}; |
| 39 | + } |
| 40 | + |
| 41 | +stmtList |
| 42 | + = first:stmt _* ';'? rest:(_* inner:stmt _* ';'?)* { |
| 43 | + var result = [first]; |
| 44 | + for (var i = 0; i < rest.length; ++i) { |
| 45 | + result.push(rest[i][1]); |
| 46 | + } |
| 47 | + return result; |
| 48 | + } |
| 49 | + |
| 50 | +stmt |
| 51 | + = attrStmt |
| 52 | + / edgeStmt |
| 53 | + / subgraphStmt |
| 54 | + / inlineAttrStmt |
| 55 | + / nodeStmt |
| 56 | + |
| 57 | +attrStmt |
| 58 | + = type:(graph / node /edge) _* attrs:attrList { |
| 59 | + return { type: "attr", attrType: type, attrs: attrs || {}}; |
| 60 | + } |
| 61 | + |
| 62 | +inlineAttrStmt |
| 63 | + = k:id _* '=' _* v:id { |
| 64 | + var attrs = {}; |
| 65 | + attrs[k] = v; |
| 66 | + return { type: "inlineAttr", attrs: attrs }; |
| 67 | + } |
| 68 | + |
| 69 | +nodeStmt |
| 70 | + = id:nodeId _* attrs:attrList? { return {type: "node", id: id, attrs: attrs || {}}; } |
| 71 | + |
| 72 | +edgeStmt |
| 73 | + = lhs:(nodeIdOrSubgraph) _* rhs:edgeRHS _* attrs:attrList? { |
| 74 | + var elems = [lhs]; |
| 75 | + for (var i = 0; i < rhs.length; ++i) { |
| 76 | + elems.push(rhs[i]); |
| 77 | + } |
| 78 | + return { type: "edge", elems: elems, attrs: attrs || {} }; |
| 79 | + } |
| 80 | + |
| 81 | +subgraphStmt |
| 82 | + = id:(subgraph _* (id _*)?)? '{' _* stmts:stmtList? _* '}' { |
| 83 | + id = (id && id[2]) || []; |
| 84 | + return { type: "subgraph", id: id[0], stmts: stmts }; |
| 85 | + } |
| 86 | + |
| 87 | +attrList |
| 88 | + = first:attrListBlock rest:(_* attrListBlock)* { |
| 89 | + var result = first; |
| 90 | + for (var i = 0; i < rest.length; ++i) { |
| 91 | + merge(result, rest[i][1]); |
| 92 | + } |
| 93 | + return result; |
| 94 | + } |
| 95 | + |
| 96 | +attrListBlock |
| 97 | + = '[' _* aList:aList? _* ']' { return aList; } |
| 98 | + |
| 99 | +aList |
| 100 | + = first:idDef rest:(_* ','? _* idDef)* { |
| 101 | + var result = first; |
| 102 | + for (var i = 0; i < rest.length; ++i) { |
| 103 | + _.merge(result, rest[i][3]); |
| 104 | + } |
| 105 | + return result; |
| 106 | + } |
| 107 | + |
| 108 | +edgeRHS |
| 109 | + = ("--" !{ return directed; } / "->" &{ return directed; }) _* rhs:(nodeIdOrSubgraph) _* rest:edgeRHS? { |
| 110 | + var result = [rhs]; |
| 111 | + if (rest) { |
| 112 | + for (var i = 0; i < rest.length; ++i) { |
| 113 | + result.push(rest[i]); |
| 114 | + } |
| 115 | + } |
| 116 | + return result; |
| 117 | + } |
| 118 | + |
| 119 | +idDef |
| 120 | + = k:id v:(_* '=' _* id)? { |
| 121 | + var result = {}; |
| 122 | + result[k] = v[3]; |
| 123 | + return result; |
| 124 | + } |
| 125 | + |
| 126 | +nodeIdOrSubgraph |
| 127 | + = subgraphStmt |
| 128 | + / id:nodeId { return { type: "node", id: id, attrs: {} }; } |
| 129 | + |
| 130 | +nodeId |
| 131 | + = id:id _* port? { return id; } |
| 132 | + |
| 133 | +port |
| 134 | + = ':' _* id _* (':' _* compassPt)? |
| 135 | + |
| 136 | +compassPt |
| 137 | + = "ne" / "se" / "sw" / "nw" / "n" / "e" / "s" / "w" / "c" / "_" |
| 138 | + |
| 139 | +id "identifier" |
| 140 | + = fst:[a-zA-Z\u0200-\u0377_] rest:[a-zA-Z\u0200-\u0377_0-9]* { return fst + rest.join(""); } |
| 141 | + / sign:'-'? dot:'.' after:[0-9]+ { |
| 142 | + return (sign || "") + dot + after.join(""); |
| 143 | + } |
| 144 | + / sign:'-'? before:[0-9]+ after:('.' [0-9]*)? { |
| 145 | + return (sign || "") + before.join("") + (after ? after[0] : "") + (after ? after[1].join("") : ""); |
| 146 | + } |
| 147 | + / '"' id:("\\\"" { return '"'; } / "\\" ch:[^"] { return "\\" + ch; } / [^"])* '"' { |
| 148 | + return id.join(""); |
| 149 | + } |
| 150 | + |
| 151 | +node = k:"node"i { return k.toLowerCase(); } |
| 152 | +edge = k:"edge"i { return k.toLowerCase(); } |
| 153 | +graph = k:"graph"i { return k.toLowerCase(); } |
| 154 | +digraph = k:"digraph"i { return k.toLowerCase(); } |
| 155 | +subgraph = k:"subgraph"i { return k.toLowerCase(); } |
| 156 | +strict = k:"strict"i { return k.toLowerCase(); } |
| 157 | + |
| 158 | +graphType |
| 159 | + = graph:graph / graph:digraph { |
| 160 | + directed = graph === "digraph"; |
| 161 | + return graph; |
| 162 | + } |
| 163 | + |
| 164 | +whitespace "whitespace" |
| 165 | + = [ \t\r\n]+ |
| 166 | + |
| 167 | +comment "comment" |
| 168 | + = "//" ([^\n])* |
| 169 | + / "/*" (!"*/" .)* "*/" |
| 170 | + |
| 171 | +_ |
| 172 | + = whitespace |
| 173 | + / comment |
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