Create individual file for add function

lib/add.js

@@ -0,0 +1,46 @@
+/**
+ * Module dependencies.
+ */
+
+var toMS = require('./toMS')
+var toSrtTime = require('./toSrtTime')
+
+/**
+ * Adds a new caption into the array of subtitles.
+ * @param {Array} subtitles
+ * @param {Object} caption
+ * @return {Array} subtitles
+ */
+
+module.exports = function add (subtitles, caption) {
+  if (!caption.start || !caption.end || !caption.text) {
+    throw new Error('Invalid caption data')
+  }
+
+  for (var prop in caption) {
+    if (!caption.hasOwnProperty(prop) || prop === 'text') {
+      continue
+    }
+
+    if (prop === 'start' || prop === 'end') {
+      if (/^(\d{2}):(\d{2}):(\d{2}),(\d{3})$/.test(caption[prop])) {
+        continue
+      }
+      if (/^\d+$/.test(caption[prop])) {
+        caption[prop] = toSrtTime(caption[prop])
+      } else {
+        throw new Error('Invalid caption time format')
+      }
+    }
+  }
+
+  subtitles.push({
+    index: subtitles.length + 1,
+    start: caption.start,
+    end: caption.end,
+    duration: toMS(caption.end) - toMS(caption.start),
+    text: caption.text
+  })
+
+  return subtitles
+}

subtitle.js

@@ -19,6 +19,7 @@ var parse = require('./lib/parse')
 var stringify = require('./lib/stringify')
 var resync = require('./lib/resync')
 var getSubtitles = require('./lib/getSubtitles')
+var add = require('./lib/add')
 
 /**
  * @constructor
@@ -64,37 +65,10 @@ fn.parse = function _parse (srt) {
  *
  * @public
  * @param {Object} Caption data
-*/
-fn.add = function (caption) {
-  if (!caption.start || !caption.end || !caption.text) {
-    throw new Error('Invalid caption data')
-  }
-
-  for (var prop in caption) {
-    if (!caption.hasOwnProperty(prop) || prop === 'text') {
-      continue
-    }
-
-    if (prop === 'start' || prop === 'end') {
-      if (/^(\d{2}):(\d{2}):(\d{2}),(\d{3})$/.test(caption[prop])) {
-        continue
-      }
-      if (/^\d+$/.test(caption[prop])) {
-        caption[prop] = Subtitle.toSrtTime(caption[prop])
-      } else {
-        throw new Error('Invalid caption time format')
-      }
-    }
-  }
-
-  this._subtitles.push({
-    index: this._subtitles.length + 1,
-    start: caption.start,
-    end: caption.end,
-    duration: Subtitle.toMS(caption.end) - Subtitle.toMS(caption.start),
-    text: caption.text
-  })
+ */
 
+fn.add = function _add (caption) {
+  add(this._subtitles, caption)
   return this
 }