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826 lines
18 KiB
826 lines
18 KiB
/**
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* Parse a text source containing data in DOT language into a JSON object.
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* The object contains two lists: one with nodes and one with edges.
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*
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* DOT language reference: http://www.graphviz.org/doc/info/lang.html
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*
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* @param {String} data Text containing a graph in DOT-notation
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* @return {Object} graph An object containing two parameters:
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* {Object[]} nodes
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* {Object[]} edges
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*/
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function parseDOT (data) {
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dot = data;
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return parseGraph();
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}
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// token types enumeration
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var TOKENTYPE = {
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NULL : 0,
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DELIMITER : 1,
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IDENTIFIER: 2,
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UNKNOWN : 3
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};
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// map with all delimiters
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var DELIMITERS = {
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'{': true,
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'}': true,
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'[': true,
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']': true,
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';': true,
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'=': true,
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',': true,
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'->': true,
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'--': true
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};
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var dot = ''; // current dot file
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var index = 0; // current index in dot file
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var c = ''; // current token character in expr
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var token = ''; // current token
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var tokenType = TOKENTYPE.NULL; // type of the token
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/**
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* Get the first character from the dot file.
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* The character is stored into the char c. If the end of the dot file is
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* reached, the function puts an empty string in c.
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*/
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function first() {
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index = 0;
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c = dot.charAt(0);
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}
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/**
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* Get the next character from the dot file.
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* The character is stored into the char c. If the end of the dot file is
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* reached, the function puts an empty string in c.
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*/
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function next() {
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index++;
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c = dot.charAt(index);
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}
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/**
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* Preview the next character from the dot file.
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* @return {String} cNext
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*/
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function nextPreview() {
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return dot.charAt(index + 1);
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}
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/**
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* Test whether given character is alphabetic or numeric
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* @param {String} c
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* @return {Boolean} isAlphaNumeric
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*/
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var regexAlphaNumeric = /[a-zA-Z_0-9.:#]/;
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function isAlphaNumeric(c) {
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return regexAlphaNumeric.test(c);
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}
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/**
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* Merge all properties of object b into object b
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* @param {Object} a
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* @param {Object} b
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* @return {Object} a
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*/
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function merge (a, b) {
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if (!a) {
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a = {};
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}
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if (b) {
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for (var name in b) {
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if (b.hasOwnProperty(name)) {
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a[name] = b[name];
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}
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}
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}
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return a;
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}
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/**
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* Set a value in an object, where the provided parameter name can be a
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* path with nested parameters. For example:
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*
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* var obj = {a: 2};
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* setValue(obj, 'b.c', 3); // obj = {a: 2, b: {c: 3}}
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*
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* @param {Object} obj
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* @param {String} path A parameter name or dot-separated parameter path,
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* like "color.highlight.border".
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* @param {*} value
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*/
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function setValue(obj, path, value) {
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var keys = path.split('.');
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var o = obj;
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while (keys.length) {
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var key = keys.shift();
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if (keys.length) {
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// this isn't the end point
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if (!o[key]) {
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o[key] = {};
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}
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o = o[key];
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}
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else {
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// this is the end point
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o[key] = value;
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}
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}
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}
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/**
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* Add a node to a graph object. If there is already a node with
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* the same id, their attributes will be merged.
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* @param {Object} graph
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* @param {Object} node
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*/
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function addNode(graph, node) {
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var i, len;
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var current = null;
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// find root graph (in case of subgraph)
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var graphs = [graph]; // list with all graphs from current graph to root graph
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var root = graph;
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while (root.parent) {
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graphs.push(root.parent);
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root = root.parent;
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}
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// find existing node (at root level) by its id
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if (root.nodes) {
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for (i = 0, len = root.nodes.length; i < len; i++) {
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if (node.id === root.nodes[i].id) {
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current = root.nodes[i];
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break;
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}
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}
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}
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if (!current) {
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// this is a new node
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current = {
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id: node.id
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};
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if (graph.node) {
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// clone default attributes
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current.attr = merge(current.attr, graph.node);
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}
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}
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// add node to this (sub)graph and all its parent graphs
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for (i = graphs.length - 1; i >= 0; i--) {
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var g = graphs[i];
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if (!g.nodes) {
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g.nodes = [];
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}
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if (g.nodes.indexOf(current) == -1) {
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g.nodes.push(current);
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}
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}
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// merge attributes
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if (node.attr) {
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current.attr = merge(current.attr, node.attr);
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}
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}
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/**
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* Add an edge to a graph object
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* @param {Object} graph
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* @param {Object} edge
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*/
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function addEdge(graph, edge) {
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if (!graph.edges) {
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graph.edges = [];
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}
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graph.edges.push(edge);
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if (graph.edge) {
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var attr = merge({}, graph.edge); // clone default attributes
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edge.attr = merge(attr, edge.attr); // merge attributes
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}
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}
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/**
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* Create an edge to a graph object
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* @param {Object} graph
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* @param {String | Number | Object} from
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* @param {String | Number | Object} to
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* @param {String} type
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* @param {Object | null} attr
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* @return {Object} edge
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*/
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function createEdge(graph, from, to, type, attr) {
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var edge = {
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from: from,
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to: to,
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type: type
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};
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if (graph.edge) {
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edge.attr = merge({}, graph.edge); // clone default attributes
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}
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edge.attr = merge(edge.attr || {}, attr); // merge attributes
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return edge;
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}
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/**
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* Get next token in the current dot file.
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* The token and token type are available as token and tokenType
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*/
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function getToken() {
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tokenType = TOKENTYPE.NULL;
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token = '';
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// skip over whitespaces
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while (c == ' ' || c == '\t' || c == '\n' || c == '\r') { // space, tab, enter
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next();
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}
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do {
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var isComment = false;
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// skip comment
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if (c == '#') {
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// find the previous non-space character
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var i = index - 1;
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while (dot.charAt(i) == ' ' || dot.charAt(i) == '\t') {
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i--;
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}
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if (dot.charAt(i) == '\n' || dot.charAt(i) == '') {
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// the # is at the start of a line, this is indeed a line comment
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while (c != '' && c != '\n') {
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next();
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}
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isComment = true;
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}
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}
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if (c == '/' && nextPreview() == '/') {
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// skip line comment
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while (c != '' && c != '\n') {
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next();
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}
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isComment = true;
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}
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if (c == '/' && nextPreview() == '*') {
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// skip block comment
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while (c != '') {
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if (c == '*' && nextPreview() == '/') {
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// end of block comment found. skip these last two characters
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next();
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next();
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break;
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}
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else {
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next();
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}
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}
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isComment = true;
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}
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// skip over whitespaces
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while (c == ' ' || c == '\t' || c == '\n' || c == '\r') { // space, tab, enter
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next();
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}
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}
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while (isComment);
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// check for end of dot file
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if (c == '') {
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// token is still empty
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tokenType = TOKENTYPE.DELIMITER;
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return;
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}
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// check for delimiters consisting of 2 characters
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var c2 = c + nextPreview();
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if (DELIMITERS[c2]) {
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tokenType = TOKENTYPE.DELIMITER;
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token = c2;
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next();
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next();
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return;
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}
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// check for delimiters consisting of 1 character
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if (DELIMITERS[c]) {
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tokenType = TOKENTYPE.DELIMITER;
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token = c;
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next();
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return;
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}
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// check for an identifier (number or string)
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// TODO: more precise parsing of numbers/strings (and the port separator ':')
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if (isAlphaNumeric(c) || c == '-') {
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token += c;
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next();
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while (isAlphaNumeric(c)) {
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token += c;
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next();
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}
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if (token == 'false') {
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token = false; // convert to boolean
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}
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else if (token == 'true') {
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token = true; // convert to boolean
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}
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else if (!isNaN(Number(token))) {
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token = Number(token); // convert to number
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}
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tokenType = TOKENTYPE.IDENTIFIER;
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return;
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}
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// check for a string enclosed by double quotes
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if (c == '"') {
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next();
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while (c != '' && (c != '"' || (c == '"' && nextPreview() == '"'))) {
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token += c;
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if (c == '"') { // skip the escape character
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next();
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}
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next();
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}
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if (c != '"') {
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throw newSyntaxError('End of string " expected');
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}
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next();
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tokenType = TOKENTYPE.IDENTIFIER;
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return;
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}
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// something unknown is found, wrong characters, a syntax error
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tokenType = TOKENTYPE.UNKNOWN;
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while (c != '') {
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token += c;
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next();
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}
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throw new SyntaxError('Syntax error in part "' + chop(token, 30) + '"');
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}
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/**
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* Parse a graph.
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* @returns {Object} graph
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*/
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function parseGraph() {
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var graph = {};
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first();
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getToken();
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// optional strict keyword
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if (token == 'strict') {
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graph.strict = true;
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getToken();
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}
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// graph or digraph keyword
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if (token == 'graph' || token == 'digraph') {
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graph.type = token;
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getToken();
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}
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// optional graph id
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if (tokenType == TOKENTYPE.IDENTIFIER) {
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graph.id = token;
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getToken();
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}
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// open angle bracket
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if (token != '{') {
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throw newSyntaxError('Angle bracket { expected');
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}
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getToken();
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// statements
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parseStatements(graph);
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// close angle bracket
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if (token != '}') {
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throw newSyntaxError('Angle bracket } expected');
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}
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getToken();
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// end of file
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if (token !== '') {
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throw newSyntaxError('End of file expected');
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}
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getToken();
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// remove temporary default properties
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delete graph.node;
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delete graph.edge;
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delete graph.graph;
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return graph;
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}
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/**
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* Parse a list with statements.
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* @param {Object} graph
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*/
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function parseStatements (graph) {
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while (token !== '' && token != '}') {
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parseStatement(graph);
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if (token == ';') {
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getToken();
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}
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}
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}
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/**
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* Parse a single statement. Can be a an attribute statement, node
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* statement, a series of node statements and edge statements, or a
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* parameter.
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* @param {Object} graph
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*/
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function parseStatement(graph) {
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// parse subgraph
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var subgraph = parseSubgraph(graph);
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if (subgraph) {
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// edge statements
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parseEdge(graph, subgraph);
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return;
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}
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// parse an attribute statement
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var attr = parseAttributeStatement(graph);
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if (attr) {
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return;
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}
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// parse node
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if (tokenType != TOKENTYPE.IDENTIFIER) {
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throw newSyntaxError('Identifier expected');
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}
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var id = token; // id can be a string or a number
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getToken();
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if (token == '=') {
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// id statement
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getToken();
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if (tokenType != TOKENTYPE.IDENTIFIER) {
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throw newSyntaxError('Identifier expected');
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}
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graph[id] = token;
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getToken();
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// TODO: implement comma separated list with "a_list: ID=ID [','] [a_list] "
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}
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else {
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parseNodeStatement(graph, id);
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}
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}
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|
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|
/**
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* Parse a subgraph
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* @param {Object} graph parent graph object
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* @return {Object | null} subgraph
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*/
|
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function parseSubgraph (graph) {
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var subgraph = null;
|
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|
|
// optional subgraph keyword
|
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if (token == 'subgraph') {
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subgraph = {};
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subgraph.type = 'subgraph';
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getToken();
|
|
|
|
// optional graph id
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if (tokenType == TOKENTYPE.IDENTIFIER) {
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subgraph.id = token;
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getToken();
|
|
}
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|
}
|
|
|
|
// open angle bracket
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if (token == '{') {
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getToken();
|
|
|
|
if (!subgraph) {
|
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subgraph = {};
|
|
}
|
|
subgraph.parent = graph;
|
|
subgraph.node = graph.node;
|
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subgraph.edge = graph.edge;
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subgraph.graph = graph.graph;
|
|
|
|
// statements
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parseStatements(subgraph);
|
|
|
|
// close angle bracket
|
|
if (token != '}') {
|
|
throw newSyntaxError('Angle bracket } expected');
|
|
}
|
|
getToken();
|
|
|
|
// remove temporary default properties
|
|
delete subgraph.node;
|
|
delete subgraph.edge;
|
|
delete subgraph.graph;
|
|
delete subgraph.parent;
|
|
|
|
// register at the parent graph
|
|
if (!graph.subgraphs) {
|
|
graph.subgraphs = [];
|
|
}
|
|
graph.subgraphs.push(subgraph);
|
|
}
|
|
|
|
return subgraph;
|
|
}
|
|
|
|
/**
|
|
* parse an attribute statement like "node [shape=circle fontSize=16]".
|
|
* Available keywords are 'node', 'edge', 'graph'.
|
|
* The previous list with default attributes will be replaced
|
|
* @param {Object} graph
|
|
* @returns {String | null} keyword Returns the name of the parsed attribute
|
|
* (node, edge, graph), or null if nothing
|
|
* is parsed.
|
|
*/
|
|
function parseAttributeStatement (graph) {
|
|
// attribute statements
|
|
if (token == 'node') {
|
|
getToken();
|
|
|
|
// node attributes
|
|
graph.node = parseAttributeList();
|
|
return 'node';
|
|
}
|
|
else if (token == 'edge') {
|
|
getToken();
|
|
|
|
// edge attributes
|
|
graph.edge = parseAttributeList();
|
|
return 'edge';
|
|
}
|
|
else if (token == 'graph') {
|
|
getToken();
|
|
|
|
// graph attributes
|
|
graph.graph = parseAttributeList();
|
|
return 'graph';
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* parse a node statement
|
|
* @param {Object} graph
|
|
* @param {String | Number} id
|
|
*/
|
|
function parseNodeStatement(graph, id) {
|
|
// node statement
|
|
var node = {
|
|
id: id
|
|
};
|
|
var attr = parseAttributeList();
|
|
if (attr) {
|
|
node.attr = attr;
|
|
}
|
|
addNode(graph, node);
|
|
|
|
// edge statements
|
|
parseEdge(graph, id);
|
|
}
|
|
|
|
/**
|
|
* Parse an edge or a series of edges
|
|
* @param {Object} graph
|
|
* @param {String | Number} from Id of the from node
|
|
*/
|
|
function parseEdge(graph, from) {
|
|
while (token == '->' || token == '--') {
|
|
var to;
|
|
var type = token;
|
|
getToken();
|
|
|
|
var subgraph = parseSubgraph(graph);
|
|
if (subgraph) {
|
|
to = subgraph;
|
|
}
|
|
else {
|
|
if (tokenType != TOKENTYPE.IDENTIFIER) {
|
|
throw newSyntaxError('Identifier or subgraph expected');
|
|
}
|
|
to = token;
|
|
addNode(graph, {
|
|
id: to
|
|
});
|
|
getToken();
|
|
}
|
|
|
|
// parse edge attributes
|
|
var attr = parseAttributeList();
|
|
|
|
// create edge
|
|
var edge = createEdge(graph, from, to, type, attr);
|
|
addEdge(graph, edge);
|
|
|
|
from = to;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Parse a set with attributes,
|
|
* for example [label="1.000", shape=solid]
|
|
* @return {Object | null} attr
|
|
*/
|
|
function parseAttributeList() {
|
|
var attr = null;
|
|
|
|
while (token == '[') {
|
|
getToken();
|
|
attr = {};
|
|
while (token !== '' && token != ']') {
|
|
if (tokenType != TOKENTYPE.IDENTIFIER) {
|
|
throw newSyntaxError('Attribute name expected');
|
|
}
|
|
var name = token;
|
|
|
|
getToken();
|
|
if (token != '=') {
|
|
throw newSyntaxError('Equal sign = expected');
|
|
}
|
|
getToken();
|
|
|
|
if (tokenType != TOKENTYPE.IDENTIFIER) {
|
|
throw newSyntaxError('Attribute value expected');
|
|
}
|
|
var value = token;
|
|
setValue(attr, name, value); // name can be a path
|
|
|
|
getToken();
|
|
if (token ==',') {
|
|
getToken();
|
|
}
|
|
}
|
|
|
|
if (token != ']') {
|
|
throw newSyntaxError('Bracket ] expected');
|
|
}
|
|
getToken();
|
|
}
|
|
|
|
return attr;
|
|
}
|
|
|
|
/**
|
|
* Create a syntax error with extra information on current token and index.
|
|
* @param {String} message
|
|
* @returns {SyntaxError} err
|
|
*/
|
|
function newSyntaxError(message) {
|
|
return new SyntaxError(message + ', got "' + chop(token, 30) + '" (char ' + index + ')');
|
|
}
|
|
|
|
/**
|
|
* Chop off text after a maximum length
|
|
* @param {String} text
|
|
* @param {Number} maxLength
|
|
* @returns {String}
|
|
*/
|
|
function chop (text, maxLength) {
|
|
return (text.length <= maxLength) ? text : (text.substr(0, 27) + '...');
|
|
}
|
|
|
|
/**
|
|
* Execute a function fn for each pair of elements in two arrays
|
|
* @param {Array | *} array1
|
|
* @param {Array | *} array2
|
|
* @param {function} fn
|
|
*/
|
|
function forEach2(array1, array2, fn) {
|
|
if (array1 instanceof Array) {
|
|
array1.forEach(function (elem1) {
|
|
if (array2 instanceof Array) {
|
|
array2.forEach(function (elem2) {
|
|
fn(elem1, elem2);
|
|
});
|
|
}
|
|
else {
|
|
fn(elem1, array2);
|
|
}
|
|
});
|
|
}
|
|
else {
|
|
if (array2 instanceof Array) {
|
|
array2.forEach(function (elem2) {
|
|
fn(array1, elem2);
|
|
});
|
|
}
|
|
else {
|
|
fn(array1, array2);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Convert a string containing a graph in DOT language into a map containing
|
|
* with nodes and edges in the format of graph.
|
|
* @param {String} data Text containing a graph in DOT-notation
|
|
* @return {Object} graphData
|
|
*/
|
|
function DOTToGraph (data) {
|
|
// parse the DOT file
|
|
var dotData = parseDOT(data);
|
|
var graphData = {
|
|
nodes: [],
|
|
edges: [],
|
|
options: {}
|
|
};
|
|
|
|
// copy the nodes
|
|
if (dotData.nodes) {
|
|
dotData.nodes.forEach(function (dotNode) {
|
|
var graphNode = {
|
|
id: dotNode.id,
|
|
label: String(dotNode.label || dotNode.id)
|
|
};
|
|
merge(graphNode, dotNode.attr);
|
|
if (graphNode.image) {
|
|
graphNode.shape = 'image';
|
|
}
|
|
graphData.nodes.push(graphNode);
|
|
});
|
|
}
|
|
|
|
// copy the edges
|
|
if (dotData.edges) {
|
|
/**
|
|
* Convert an edge in DOT format to an edge with VisGraph format
|
|
* @param {Object} dotEdge
|
|
* @returns {Object} graphEdge
|
|
*/
|
|
function convertEdge(dotEdge) {
|
|
var graphEdge = {
|
|
from: dotEdge.from,
|
|
to: dotEdge.to
|
|
};
|
|
merge(graphEdge, dotEdge.attr);
|
|
graphEdge.style = (dotEdge.type == '->') ? 'arrow' : 'line';
|
|
return graphEdge;
|
|
}
|
|
|
|
dotData.edges.forEach(function (dotEdge) {
|
|
var from, to;
|
|
if (dotEdge.from instanceof Object) {
|
|
from = dotEdge.from.nodes;
|
|
}
|
|
else {
|
|
from = {
|
|
id: dotEdge.from
|
|
}
|
|
}
|
|
|
|
if (dotEdge.to instanceof Object) {
|
|
to = dotEdge.to.nodes;
|
|
}
|
|
else {
|
|
to = {
|
|
id: dotEdge.to
|
|
}
|
|
}
|
|
|
|
if (dotEdge.from instanceof Object && dotEdge.from.edges) {
|
|
dotEdge.from.edges.forEach(function (subEdge) {
|
|
var graphEdge = convertEdge(subEdge);
|
|
graphData.edges.push(graphEdge);
|
|
});
|
|
}
|
|
|
|
forEach2(from, to, function (from, to) {
|
|
var subEdge = createEdge(graphData, from.id, to.id, dotEdge.type, dotEdge.attr);
|
|
var graphEdge = convertEdge(subEdge);
|
|
graphData.edges.push(graphEdge);
|
|
});
|
|
|
|
if (dotEdge.to instanceof Object && dotEdge.to.edges) {
|
|
dotEdge.to.edges.forEach(function (subEdge) {
|
|
var graphEdge = convertEdge(subEdge);
|
|
graphData.edges.push(graphEdge);
|
|
});
|
|
}
|
|
});
|
|
}
|
|
|
|
// copy the options
|
|
if (dotData.attr) {
|
|
graphData.options = dotData.attr;
|
|
}
|
|
|
|
return graphData;
|
|
}
|
|
|
|
// exports
|
|
exports.parseDOT = parseDOT;
|
|
exports.DOTToGraph = DOTToGraph;
|