WIP - add extractor, generate snippet_data

node_modules/trough/index.js

@@ -0,0 +1,74 @@
+'use strict'
+
+var wrap = require('./wrap.js')
+
+module.exports = trough
+
+trough.wrap = wrap
+
+var slice = [].slice
+
+// Create new middleware.
+function trough() {
+  var fns = []
+  var middleware = {}
+
+  middleware.run = run
+  middleware.use = use
+
+  return middleware
+
+  // Run `fns`.  Last argument must be a completion handler.
+  function run() {
+    var index = -1
+    var input = slice.call(arguments, 0, -1)
+    var done = arguments[arguments.length - 1]
+
+    if (typeof done !== 'function') {
+      throw new Error('Expected function as last argument, not ' + done)
+    }
+
+    next.apply(null, [null].concat(input))
+
+    // Run the next `fn`, if any.
+    function next(err) {
+      var fn = fns[++index]
+      var params = slice.call(arguments, 0)
+      var values = params.slice(1)
+      var length = input.length
+      var pos = -1
+
+      if (err) {
+        done(err)
+        return
+      }
+
+      // Copy non-nully input into values.
+      while (++pos < length) {
+        if (values[pos] === null || values[pos] === undefined) {
+          values[pos] = input[pos]
+        }
+      }
+
+      input = values
+
+      // Next or done.
+      if (fn) {
+        wrap(fn, next).apply(null, input)
+      } else {
+        done.apply(null, [null].concat(input))
+      }
+    }
+  }
+
+  // Add `fn` to the list.
+  function use(fn) {
+    if (typeof fn !== 'function') {
+      throw new Error('Expected `fn` to be a function, not ' + fn)
+    }
+
+    fns.push(fn)
+
+    return middleware
+  }
+}