Allow meta information to be loaded from XML.

lib/shared/publisher/meta.js

@@ -2,7 +2,7 @@
 var xml2js = require('xml2js');
 
 /**
- * Represents metadata.
+ * Represents meta information.
  * @constructor
  * @param {!ISeries} series
  * @param {!IChapter} chapter
@@ -19,6 +19,30 @@ function Meta(series, chapter) {
   this.writer = series.authors.join(', ');
 }
 
+/**
+ * Loads meta information from xml.
+ * @param {string} xml
+ * @param {function(Error, Meta)} done
+ */
+Meta.load = function(xml, done) {
+  xml2js.parseString(xml, {
+    explicitArray: false,
+    explicitRoot: false
+  }, function(err, result) {
+    if (err) return done(err);
+    var meta = lowerCamelCase(result, Object.create(Meta.prototype));
+    meta.genre = defaultTo(meta.genre, '');
+    meta.number = defaultTo(meta.number);
+    meta.penciller = defaultTo(meta.penciller, '');
+    meta.series = defaultTo(meta.series);
+    meta.summary = defaultTo(meta.summary);
+    meta.title = defaultTo(meta.title);
+    meta.volume = defaultTo(meta.volume);
+    meta.writer = defaultTo(meta.writer, '');
+    done(undefined, meta);
+  });
+};
+
 /**
  * Add a page to the metadata.
  * @param {string} key
@@ -33,28 +57,56 @@ Meta.prototype.add = function(key, number) {
 };
 
 /**
- * Export metadata to xml.
+ * Export meta information to xml.
  * @return {string}
  */
 Meta.prototype.xml = function() {
   return new xml2js.Builder({
     rootName: 'ComicInfo',
     xmldec: {version: '1.0', encoding: 'utf-8'}
-  }).buildObject(map(this));
+  }).buildObject(titleCase(this));
 };
 
+/**
+ * Defaults a value.
+ * @private
+ * @param {*} value
+ * @param {*=} defaultValue
+ * @return {*}
+ */
+function defaultTo(value, defaultValue) {
+  return value || defaultValue;
+}
+
+/**
+ * Map the source to a duplicate with lower camel case case keys.
+ * @private
+ * @param {(!Array.<!Object>|!Object)} src
+ * @param {!Object=} destination
+ * @return {(!Array.<!Object>|!Object)}
+ */
+function lowerCamelCase(src, destination) {
+  var res = destination || (Array.isArray(src) ? [] : {});
+  Object.keys(src).forEach(function(x) {
+    if (typeof src[x] === 'undefined') return;
+    var title = x.charAt(0).toLowerCase() + x.substr(1);
+    res[title] = typeof src[x] === 'object' ? lowerCamelCase(src[x]) : src[x];
+  });
+  return res;
+}
+
 /**
  * Map the source to a duplicate with title case keys.
  * @private
  * @param {(!Array.<!Object>|!Object)} src
  * @return {(!Array.<!Object>|!Object)}
  */
-function map(src) {
+function titleCase(src) {
   var res = Array.isArray(src) ? [] : {};
   Object.keys(src).forEach(function(x) {
     if (typeof src[x] === 'undefined') return;
     var title = x.charAt(0).toUpperCase() + x.substr(1);
-    res[title] = typeof src[x] === 'object' ? map(src[x]) : src[x];
+    res[title] = typeof src[x] === 'object' ? titleCase(src[x]) : src[x];
   });
   return res;
 }