Current Dev State

static/js/ketcher2/node_modules/gulp-tap/src/tap.coffee

@@ -0,0 +1,62 @@
+'use strict'
+
+baseStream = require('stream')
+through = require('through2')
+
+DEBUG = process.env.NODE_ENV is 'development'
+
+
+###
+# Taps into the pipeline and allows user to easily route data through
+# another stream or change content.
+###
+module.exports = (lambda) ->
+  utils = (tapStream, file) ->
+
+    ###
+    # Routes through another stream. The filter must not be
+    # created. This will create the filter as needed.
+    #
+    # @param filter {stream}
+    # @param args {Array} Array containg arguments to apply to filter.
+    #
+    # @example
+    #   t.through coffee, [{bare: true}]
+    ###
+    through: (filter, args) ->
+
+      if DEBUG
+        if not Array.isArray(args)
+          throw new TypeError("Args must be an array to `apply` to the filter")
+
+      stream = filter.apply(null, args)
+      stream.on "error", (err) ->
+        tapStream.emit "error", err
+
+      # Use original stream pipe file when emit `end/data` event
+      # stream.pipe tapStream
+
+      stream.write file
+      stream
+
+  modifyFile = (file, enc, cb) ->
+    inst = file: file
+    obj = lambda(inst.file, utils(this, inst.file), inst)
+
+    next = () =>
+      this.push(file)
+      cb()
+
+    # if user returned a stream
+    # passthrough when the stream is ended
+    if obj instanceof baseStream and not obj._readableState.ended
+
+      obj.on('end', next)
+      obj.on('data', data = ->
+        obj.removeListener 'end', next
+        obj.removeListener 'data', data
+        next())
+    else
+      next()
+
+  return through.obj(modifyFile, (cb) -> cb())