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// through2 is a thin wrapper around node transform streams | |
var through = require('through2'), | |
gutil = require('gulp-util'), | |
esprima = require('esprima'), | |
escodegen = require('escodegen'), | |
estraverse = require('estraverse'), | |
_ = require('lodash'), | |
PluginError = gutil.PluginError; | |
// consts | |
const PLUGIN_NAME = 'gulp-operationalyzer'; | |
function isOperation( node, parent ) { | |
return node && parent && | |
node.type !== 'ObjectExpression' && | |
node.type !== 'ArrayExpression' && | |
node.type !== 'Literal' && | |
( node.type !== 'UnaryExpression' || node.argument.type === 'Identifier' ) && | |
( parent.type === 'Property' || parent.type === 'ArrayExpression' ); | |
} | |
function unique(e, i, arr) { | |
return arr.lastIndexOf(e) === i; | |
} | |
// plugin level function (dealing with files) | |
function operationalyzer() { | |
// prepare a generic operation object that we'll reuse to replace each operation | |
var operation = esprima.parse('_ = {_operation: \'\', _parameters: [], _dependencies: []}') | |
.body[0].expression.right.properties; | |
// creating a stream through which each file will pass | |
var stream = through.obj(function(file, enc, cb) { | |
var ast = esprima.parse( file.contents.toString() ), | |
inOperation, | |
inMember, | |
toLiteralize = [], | |
parameters, | |
dependencies, | |
updatedAst; | |
updatedAst = estraverse.replace( ast, { | |
enter: function( node, parent ) { | |
// make all object keys strings | |
// (otherwise in `{ y: y }`, both `y`s are undistinguishable) | |
if ( node.type === 'Property' && node.key.type === 'Identifier' ) { | |
node.key.type = 'Literal'; | |
node.key.value = node.key.name; | |
node.key.raw = '\'' + node.key.name + '\''; | |
return node; | |
} | |
if ( !inOperation && isOperation( node, parent ) ) { | |
inOperation = true; | |
toLiteralize.push( node ); | |
parameters = []; | |
dependencies = []; | |
} | |
if ( inOperation ) { | |
if ( inMember ) { | |
return; | |
} | |
if ( node.type === 'MemberExpression' ) { | |
inMember = node; | |
if ( node.object.name !== 'Math' && node.object.name !== 'Utils' ) { | |
dependencies.push( escodegen.generate( node ) ); | |
} | |
return; | |
} | |
if ( node.type === 'Identifier' && node.name !== 'Array' && node.name !== 'Object' ) { | |
parameters.push( node.name ); | |
} | |
} | |
}, | |
leave: function( node ) { | |
if ( node === inMember ) { | |
inMember = false; | |
} | |
if ( toLiteralize.indexOf( node ) !== -1 ) { | |
inOperation = false; | |
toLiteralize.splice( toLiteralize.indexOf( node ), 1 ); | |
var tmp = escodegen.generate( node ); | |
node.type = 'ObjectExpression'; | |
node.properties = _.cloneDeep( operation ); | |
node.properties[0].value.value = tmp; | |
node.properties[0].value.raw = '\'' + node.properties[0].value + '\''; | |
node.properties[1].value.elements = | |
parameters | |
.map(function( param ) { | |
return { | |
type: 'Literal', | |
value: param, | |
raw: '\'' + param + '\'' | |
}; | |
}) | |
.filter(unique); | |
node.properties[2].value.elements = | |
dependencies | |
.map(function( dep ) { | |
// transform contours[0].nodes[1].x into contours.0.nodes.1.x | |
// which is invalid javascript but easier to use | |
dep = dep.replace( /\[\s*(\d+)\s*\]/g, '.$1' ); | |
return { | |
type: 'Literal', | |
value: dep, | |
raw: '\'' + dep + '\'' | |
}; | |
}) | |
.filter(unique); | |
return node; | |
} | |
} | |
}); | |
file.contents = new Buffer( escodegen.generate( updatedAst ) ); | |
this.push(file); | |
return cb(); | |
}); | |
// returning the file stream | |
return stream; | |
} | |
// exporting the plugin main function | |
module.exports = operationalyzer; |
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