You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
826 lines
18 KiB
826 lines
18 KiB
/**
|
|
* Parse a text source containing data in DOT language into a JSON object.
|
|
* The object contains two lists: one with nodes and one with edges.
|
|
*
|
|
* DOT language reference: http://www.graphviz.org/doc/info/lang.html
|
|
*
|
|
* @param {String} data Text containing a graph in DOT-notation
|
|
* @return {Object} graph An object containing two parameters:
|
|
* {Object[]} nodes
|
|
* {Object[]} edges
|
|
*/
|
|
function parseDOT (data) {
|
|
dot = data;
|
|
return parseGraph();
|
|
}
|
|
|
|
// token types enumeration
|
|
var TOKENTYPE = {
|
|
NULL : 0,
|
|
DELIMITER : 1,
|
|
IDENTIFIER: 2,
|
|
UNKNOWN : 3
|
|
};
|
|
|
|
// map with all delimiters
|
|
var DELIMITERS = {
|
|
'{': true,
|
|
'}': true,
|
|
'[': true,
|
|
']': true,
|
|
';': true,
|
|
'=': true,
|
|
',': true,
|
|
|
|
'->': true,
|
|
'--': true
|
|
};
|
|
|
|
var dot = ''; // current dot file
|
|
var index = 0; // current index in dot file
|
|
var c = ''; // current token character in expr
|
|
var token = ''; // current token
|
|
var tokenType = TOKENTYPE.NULL; // type of the token
|
|
|
|
/**
|
|
* Get the first character from the dot file.
|
|
* The character is stored into the char c. If the end of the dot file is
|
|
* reached, the function puts an empty string in c.
|
|
*/
|
|
function first() {
|
|
index = 0;
|
|
c = dot.charAt(0);
|
|
}
|
|
|
|
/**
|
|
* Get the next character from the dot file.
|
|
* The character is stored into the char c. If the end of the dot file is
|
|
* reached, the function puts an empty string in c.
|
|
*/
|
|
function next() {
|
|
index++;
|
|
c = dot.charAt(index);
|
|
}
|
|
|
|
/**
|
|
* Preview the next character from the dot file.
|
|
* @return {String} cNext
|
|
*/
|
|
function nextPreview() {
|
|
return dot.charAt(index + 1);
|
|
}
|
|
|
|
/**
|
|
* Test whether given character is alphabetic or numeric
|
|
* @param {String} c
|
|
* @return {Boolean} isAlphaNumeric
|
|
*/
|
|
var regexAlphaNumeric = /[a-zA-Z_0-9.:#]/;
|
|
function isAlphaNumeric(c) {
|
|
return regexAlphaNumeric.test(c);
|
|
}
|
|
|
|
/**
|
|
* Merge all options of object b into object b
|
|
* @param {Object} a
|
|
* @param {Object} b
|
|
* @return {Object} a
|
|
*/
|
|
function merge (a, b) {
|
|
if (!a) {
|
|
a = {};
|
|
}
|
|
|
|
if (b) {
|
|
for (var name in b) {
|
|
if (b.hasOwnProperty(name)) {
|
|
a[name] = b[name];
|
|
}
|
|
}
|
|
}
|
|
return a;
|
|
}
|
|
|
|
/**
|
|
* Set a value in an object, where the provided parameter name can be a
|
|
* path with nested parameters. For example:
|
|
*
|
|
* var obj = {a: 2};
|
|
* setValue(obj, 'b.c', 3); // obj = {a: 2, b: {c: 3}}
|
|
*
|
|
* @param {Object} obj
|
|
* @param {String} path A parameter name or dot-separated parameter path,
|
|
* like "color.highlight.border".
|
|
* @param {*} value
|
|
*/
|
|
function setValue(obj, path, value) {
|
|
var keys = path.split('.');
|
|
var o = obj;
|
|
while (keys.length) {
|
|
var key = keys.shift();
|
|
if (keys.length) {
|
|
// this isn't the end point
|
|
if (!o[key]) {
|
|
o[key] = {};
|
|
}
|
|
o = o[key];
|
|
}
|
|
else {
|
|
// this is the end point
|
|
o[key] = value;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Add a node to a graph object. If there is already a node with
|
|
* the same id, their attributes will be merged.
|
|
* @param {Object} graph
|
|
* @param {Object} node
|
|
*/
|
|
function addNode(graph, node) {
|
|
var i, len;
|
|
var current = null;
|
|
|
|
// find root graph (in case of subgraph)
|
|
var graphs = [graph]; // list with all graphs from current graph to root graph
|
|
var root = graph;
|
|
while (root.parent) {
|
|
graphs.push(root.parent);
|
|
root = root.parent;
|
|
}
|
|
|
|
// find existing node (at root level) by its id
|
|
if (root.nodes) {
|
|
for (i = 0, len = root.nodes.length; i < len; i++) {
|
|
if (node.id === root.nodes[i].id) {
|
|
current = root.nodes[i];
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!current) {
|
|
// this is a new node
|
|
current = {
|
|
id: node.id
|
|
};
|
|
if (graph.node) {
|
|
// clone default attributes
|
|
current.attr = merge(current.attr, graph.node);
|
|
}
|
|
}
|
|
|
|
// add node to this (sub)graph and all its parent graphs
|
|
for (i = graphs.length - 1; i >= 0; i--) {
|
|
var g = graphs[i];
|
|
|
|
if (!g.nodes) {
|
|
g.nodes = [];
|
|
}
|
|
if (g.nodes.indexOf(current) == -1) {
|
|
g.nodes.push(current);
|
|
}
|
|
}
|
|
|
|
// merge attributes
|
|
if (node.attr) {
|
|
current.attr = merge(current.attr, node.attr);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Add an edge to a graph object
|
|
* @param {Object} graph
|
|
* @param {Object} edge
|
|
*/
|
|
function addEdge(graph, edge) {
|
|
if (!graph.edges) {
|
|
graph.edges = [];
|
|
}
|
|
graph.edges.push(edge);
|
|
if (graph.edge) {
|
|
var attr = merge({}, graph.edge); // clone default attributes
|
|
edge.attr = merge(attr, edge.attr); // merge attributes
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Create an edge to a graph object
|
|
* @param {Object} graph
|
|
* @param {String | Number | Object} from
|
|
* @param {String | Number | Object} to
|
|
* @param {String} type
|
|
* @param {Object | null} attr
|
|
* @return {Object} edge
|
|
*/
|
|
function createEdge(graph, from, to, type, attr) {
|
|
var edge = {
|
|
from: from,
|
|
to: to,
|
|
type: type
|
|
};
|
|
|
|
if (graph.edge) {
|
|
edge.attr = merge({}, graph.edge); // clone default attributes
|
|
}
|
|
edge.attr = merge(edge.attr || {}, attr); // merge attributes
|
|
|
|
return edge;
|
|
}
|
|
|
|
/**
|
|
* Get next token in the current dot file.
|
|
* The token and token type are available as token and tokenType
|
|
*/
|
|
function getToken() {
|
|
tokenType = TOKENTYPE.NULL;
|
|
token = '';
|
|
|
|
// skip over whitespaces
|
|
while (c == ' ' || c == '\t' || c == '\n' || c == '\r') { // space, tab, enter
|
|
next();
|
|
}
|
|
|
|
do {
|
|
var isComment = false;
|
|
|
|
// skip comment
|
|
if (c == '#') {
|
|
// find the previous non-space character
|
|
var i = index - 1;
|
|
while (dot.charAt(i) == ' ' || dot.charAt(i) == '\t') {
|
|
i--;
|
|
}
|
|
if (dot.charAt(i) == '\n' || dot.charAt(i) == '') {
|
|
// the # is at the start of a line, this is indeed a line comment
|
|
while (c != '' && c != '\n') {
|
|
next();
|
|
}
|
|
isComment = true;
|
|
}
|
|
}
|
|
if (c == '/' && nextPreview() == '/') {
|
|
// skip line comment
|
|
while (c != '' && c != '\n') {
|
|
next();
|
|
}
|
|
isComment = true;
|
|
}
|
|
if (c == '/' && nextPreview() == '*') {
|
|
// skip block comment
|
|
while (c != '') {
|
|
if (c == '*' && nextPreview() == '/') {
|
|
// end of block comment found. skip these last two characters
|
|
next();
|
|
next();
|
|
break;
|
|
}
|
|
else {
|
|
next();
|
|
}
|
|
}
|
|
isComment = true;
|
|
}
|
|
|
|
// skip over whitespaces
|
|
while (c == ' ' || c == '\t' || c == '\n' || c == '\r') { // space, tab, enter
|
|
next();
|
|
}
|
|
}
|
|
while (isComment);
|
|
|
|
// check for end of dot file
|
|
if (c == '') {
|
|
// token is still empty
|
|
tokenType = TOKENTYPE.DELIMITER;
|
|
return;
|
|
}
|
|
|
|
// check for delimiters consisting of 2 characters
|
|
var c2 = c + nextPreview();
|
|
if (DELIMITERS[c2]) {
|
|
tokenType = TOKENTYPE.DELIMITER;
|
|
token = c2;
|
|
next();
|
|
next();
|
|
return;
|
|
}
|
|
|
|
// check for delimiters consisting of 1 character
|
|
if (DELIMITERS[c]) {
|
|
tokenType = TOKENTYPE.DELIMITER;
|
|
token = c;
|
|
next();
|
|
return;
|
|
}
|
|
|
|
// check for an identifier (number or string)
|
|
// TODO: more precise parsing of numbers/strings (and the port separator ':')
|
|
if (isAlphaNumeric(c) || c == '-') {
|
|
token += c;
|
|
next();
|
|
|
|
while (isAlphaNumeric(c)) {
|
|
token += c;
|
|
next();
|
|
}
|
|
if (token == 'false') {
|
|
token = false; // convert to boolean
|
|
}
|
|
else if (token == 'true') {
|
|
token = true; // convert to boolean
|
|
}
|
|
else if (!isNaN(Number(token))) {
|
|
token = Number(token); // convert to number
|
|
}
|
|
tokenType = TOKENTYPE.IDENTIFIER;
|
|
return;
|
|
}
|
|
|
|
// check for a string enclosed by double quotes
|
|
if (c == '"') {
|
|
next();
|
|
while (c != '' && (c != '"' || (c == '"' && nextPreview() == '"'))) {
|
|
token += c;
|
|
if (c == '"') { // skip the escape character
|
|
next();
|
|
}
|
|
next();
|
|
}
|
|
if (c != '"') {
|
|
throw newSyntaxError('End of string " expected');
|
|
}
|
|
next();
|
|
tokenType = TOKENTYPE.IDENTIFIER;
|
|
return;
|
|
}
|
|
|
|
// something unknown is found, wrong characters, a syntax error
|
|
tokenType = TOKENTYPE.UNKNOWN;
|
|
while (c != '') {
|
|
token += c;
|
|
next();
|
|
}
|
|
throw new SyntaxError('Syntax error in part "' + chop(token, 30) + '"');
|
|
}
|
|
|
|
/**
|
|
* Parse a graph.
|
|
* @returns {Object} graph
|
|
*/
|
|
function parseGraph() {
|
|
var graph = {};
|
|
|
|
first();
|
|
getToken();
|
|
|
|
// optional strict keyword
|
|
if (token == 'strict') {
|
|
graph.strict = true;
|
|
getToken();
|
|
}
|
|
|
|
// graph or digraph keyword
|
|
if (token == 'graph' || token == 'digraph') {
|
|
graph.type = token;
|
|
getToken();
|
|
}
|
|
|
|
// optional graph id
|
|
if (tokenType == TOKENTYPE.IDENTIFIER) {
|
|
graph.id = token;
|
|
getToken();
|
|
}
|
|
|
|
// open angle bracket
|
|
if (token != '{') {
|
|
throw newSyntaxError('Angle bracket { expected');
|
|
}
|
|
getToken();
|
|
|
|
// statements
|
|
parseStatements(graph);
|
|
|
|
// close angle bracket
|
|
if (token != '}') {
|
|
throw newSyntaxError('Angle bracket } expected');
|
|
}
|
|
getToken();
|
|
|
|
// end of file
|
|
if (token !== '') {
|
|
throw newSyntaxError('End of file expected');
|
|
}
|
|
getToken();
|
|
|
|
// remove temporary default options
|
|
delete graph.node;
|
|
delete graph.edge;
|
|
delete graph.graph;
|
|
|
|
return graph;
|
|
}
|
|
|
|
/**
|
|
* Parse a list with statements.
|
|
* @param {Object} graph
|
|
*/
|
|
function parseStatements (graph) {
|
|
while (token !== '' && token != '}') {
|
|
parseStatement(graph);
|
|
if (token == ';') {
|
|
getToken();
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Parse a single statement. Can be a an attribute statement, node
|
|
* statement, a series of node statements and edge statements, or a
|
|
* parameter.
|
|
* @param {Object} graph
|
|
*/
|
|
function parseStatement(graph) {
|
|
// parse subgraph
|
|
var subgraph = parseSubgraph(graph);
|
|
if (subgraph) {
|
|
// edge statements
|
|
parseEdge(graph, subgraph);
|
|
|
|
return;
|
|
}
|
|
|
|
// parse an attribute statement
|
|
var attr = parseAttributeStatement(graph);
|
|
if (attr) {
|
|
return;
|
|
}
|
|
|
|
// parse node
|
|
if (tokenType != TOKENTYPE.IDENTIFIER) {
|
|
throw newSyntaxError('Identifier expected');
|
|
}
|
|
var id = token; // id can be a string or a number
|
|
getToken();
|
|
|
|
if (token == '=') {
|
|
// id statement
|
|
getToken();
|
|
if (tokenType != TOKENTYPE.IDENTIFIER) {
|
|
throw newSyntaxError('Identifier expected');
|
|
}
|
|
graph[id] = token;
|
|
getToken();
|
|
// TODO: implement comma separated list with "a_list: ID=ID [','] [a_list] "
|
|
}
|
|
else {
|
|
parseNodeStatement(graph, id);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Parse a subgraph
|
|
* @param {Object} graph parent graph object
|
|
* @return {Object | null} subgraph
|
|
*/
|
|
function parseSubgraph (graph) {
|
|
var subgraph = null;
|
|
|
|
// optional subgraph keyword
|
|
if (token == 'subgraph') {
|
|
subgraph = {};
|
|
subgraph.type = 'subgraph';
|
|
getToken();
|
|
|
|
// optional graph id
|
|
if (tokenType == TOKENTYPE.IDENTIFIER) {
|
|
subgraph.id = token;
|
|
getToken();
|
|
}
|
|
}
|
|
|
|
// open angle bracket
|
|
if (token == '{') {
|
|
getToken();
|
|
|
|
if (!subgraph) {
|
|
subgraph = {};
|
|
}
|
|
subgraph.parent = graph;
|
|
subgraph.node = graph.node;
|
|
subgraph.edge = graph.edge;
|
|
subgraph.graph = graph.graph;
|
|
|
|
// statements
|
|
parseStatements(subgraph);
|
|
|
|
// close angle bracket
|
|
if (token != '}') {
|
|
throw newSyntaxError('Angle bracket } expected');
|
|
}
|
|
getToken();
|
|
|
|
// remove temporary default options
|
|
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 (Array.isArray(array1)) {
|
|
array1.forEach(function (elem1) {
|
|
if (Array.isArray(array2)) {
|
|
array2.forEach(function (elem2) {
|
|
fn(elem1, elem2);
|
|
});
|
|
}
|
|
else {
|
|
fn(elem1, array2);
|
|
}
|
|
});
|
|
}
|
|
else {
|
|
if (Array.isArray(array2)) {
|
|
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
|
|
*/
|
|
var convertEdge = function (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;
|