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127 lines
2.6 KiB
127 lines
2.6 KiB
/*
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* grunt-forceAtlas2
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*
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* This task crush and minify Force Atlas 2 code.
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*/
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var uglify = require('uglify-js');
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// Shorteners
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function minify(string) {
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return uglify.minify(string, {fromString: true}).code;
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}
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// Crushing function
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function crush(fnString) {
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var pattern,
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i,
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l;
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var np = [
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'x',
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'y',
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'dx',
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'dy',
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'old_dx',
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'old_dy',
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'mass',
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'convergence',
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'size',
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'fixed'
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];
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var ep = [
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'source',
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'target',
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'weight'
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];
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var rp = [
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'node',
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'centerX',
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'centerY',
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'size',
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'nextSibling',
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'firstChild',
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'mass',
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'massCenterX',
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'massCenterY'
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];
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// Replacing matrix accessors by incremented indexes
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for (i = 0, l = rp.length; i < l; i++) {
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pattern = new RegExp('rp\\(([^,]*), \'' + rp[i] + '\'\\)', 'g');
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fnString = fnString.replace(
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pattern,
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(i === 0) ? '$1' : '$1 + ' + i
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);
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}
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for (i = 0, l = np.length; i < l; i++) {
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pattern = new RegExp('np\\(([^,]*), \'' + np[i] + '\'\\)', 'g');
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fnString = fnString.replace(
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pattern,
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(i === 0) ? '$1' : '$1 + ' + i
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);
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}
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for (i = 0, l = ep.length; i < l; i++) {
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pattern = new RegExp('ep\\(([^,]*), \'' + ep[i] + '\'\\)', 'g');
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fnString = fnString.replace(
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pattern,
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(i === 0) ? '$1' : '$1 + ' + i
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);
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}
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return fnString;
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}
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// Cleaning function
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function clean(string) {
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return string.replace(
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/function crush\(fnString\)/,
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'var crush = null; function no_crush(fnString)'
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);
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}
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module.exports = function(grunt) {
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// Force atlas grunt multitask
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function multitask() {
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// Merge task-specific and/or target-specific options with these defaults.
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var options = this.options({});
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// Iterate over all specified file groups.
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this.files.forEach(function(f) {
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// Concat specified files.
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var src = f.src.filter(function(filepath) {
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// Warn on and remove invalid source files (if nonull was set).
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if (!grunt.file.exists(filepath)) {
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grunt.log.warn('Source file "' + filepath + '" not found.');
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return false;
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} else {
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return true;
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}
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}).map(function(filepath) {
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// Read file source.
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return grunt.file.read(filepath);
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}).join('\n');
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// Crushing, cleaning and minifying
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src = minify(clean(crush(src)));
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// Write the destination file.
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grunt.file.write(f.dest, src);
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// Print a success message.
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grunt.log.writeln('File "' + f.dest + '" created.');
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});
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}
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// Registering the task
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grunt.registerMultiTask(
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'forceAtlas2',
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'A grunt task to crush and minify ForceAtlas2.',
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multitask
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);
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};
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