#!/usr/bin/env node

//=================================================================================================

//

// This script is used to regenerate the example visualizations

//

//=================================================================================================

var fs = require('fs'),

path = require('path'),

child = require('child_process');

//-------------------------------------------------------------------------------------------------

fs.readdirSync('examples')

.filter(function(file) { return path.extname(file) === ".js" })

.map(visualize);

//-------------------------------------------------------------------------------------------------

function visualize(example) {

var name = path.basename(example, '.js'),

fsm = require('../examples/' + example),

dot = fsm.visualize(),

svg = dot2svg(dot),

png = dot2png(dot);

console.log('visualizing examples/' + example);

fs.writeFileSync('examples/' + name + '.dot', dot);

fs.writeFileSync('examples/' + name + '.svg', svg);

fs.writeFileSync('examples/' + name + '.png', png, 'binary');

}

//-------------------------------------------------------------------------------------------------

function dot2svg(dot) {

var result = child.spawnSync("dot", ["-Tsvg"], { input: dot });

if (result.error)

dotError(result.error.errno);

return result.stdout.toString();

}

//-------------------------------------------------------------------------------------------------

function dot2png(dot) {

var result = child.spawnSync("dot", ["-Tpng"], { input: dot });

if (result.error)

dotError(result.error.errno);

return result.stdout;

}

//-------------------------------------------------------------------------------------------------

function dotError(errno) {

if (errno === 'ENOENT')

throw new Error("dot program not found. Install graphviz (http://graphviz.org)")

else

throw new Error("unexpected error: " + errno)

}

//-------------------------------------------------------------------------------------------------