Date processing and clean up of source code

The functions that process the date are implemented and some clean up of
the code was made.

date_processor.js

@@ -0,0 +1,21 @@
+// regex pattern for finding the dates
+var REGEX_DATE = /((\d{1,2}/\d{1,2}/(\d{4}|\d{2}))|(\d{4}-\d{2}-\d{2})|(\d{1,2}(st|nd|rd|th)*\s*(Jan|January|Feb|February|Mar|March|Apr|April|May|Jun|June|Jul|July|Aug|August|Sep|September|Oct|October|Nov|November|Dec|December)\s*(\d{4}|\d{2}))|((Jan|January|Feb|February|Mar|March|Apr|April|May|Jun|June|Jul|July|Aug|August|Sep|September|Oct|October|Nov|November|Dec|December)(,)?\s*\d{1,2}(st|nd|rd|th)*\s*(\d{4}|\d{2}))|((Jan|January|Feb|February|Mar|March|Apr|April|May|Jun|June|Jul|July|Aug|August|Sep|September|Oct|October|Nov|November|Dec|December)\s*\d{1,2}(st|nd|rd|th)*\s*(,)?\s*(\d{4}|\d{2})))/i;
+// ISO format for dates
+var DATE_ISO_FORMAT = "yyyy-MM-dd";
+
+// gets a mathced date from regex and converts to a string in the ISO format
+// using the Datejs library
+function get_iso_date(matched_date){
+    Date.parse(matched_date).toString(DATE_ISO_FORMAT);
+}
+
+// returns the matched date found in the line
+function get_literal_date(line){
+    return line.match(REGEX_DATE);
+}
+
+// verifies if a line contains a date
+// returning a true value in positive case
+function has_date(line){
+    return REGEX_DATE.test(line);
+}

email_connector.js

@@ -28,12 +28,12 @@ function get_message_text(gmail_message){
     return gmail_message.getPlainBody();
 }
 
+// returns the subject text of a GMail message
+function get_subject_text(gmail_message){
+    return gmail_message.getSubject();
+}
+
 // main function, which returns the plain text body of all unread GMail messages
 function get_body_all_unread_messages(){
     return get_unread_messages(get_unread_threads()).map(get_message_text);
 }
-
-// debug function
-function debug(){
-    Logger.log("Unread messages:\n%s", get_body_all_unread_messages());
-}

email_processor.js

@@ -1,16 +1,28 @@
 // regex patter for finding the "key line" that classifies the email as "call for papers"
-var regex_key_line = /((call\s+for\s+(paper|papers))|submission|deadline)/i; //ignore case
-// regex pattern for finding the dates
-// var regex_date = /((\d{1,2}/\d{1,2}/(\d{4}|\d{2}))|(\d{4}-\d{2}-\d{2})|(\d{1,2}(st|nd|rd|th)*\s*(Jan|January|Feb|February|Mar|March|Apr|April|May|Jun|June|Jul|July|Aug|August|Sep|September|Oct|October|Nov|November|Dec|December)\s*(\d{4}|\d{2}))|((Jan|January|Feb|February|Mar|March|Apr|April|May|Jun|June|Jul|July|Aug|August|Sep|September|Oct|October|Nov|November|Dec|December)(,)?\s*\d{1,2}(st|nd|rd|th)*\s*(\d{4}|\d{2}))|((Jan|January|Feb|February|Mar|March|Apr|April|May|Jun|June|Jul|July|Aug|August|Sep|September|Oct|October|Nov|November|Dec|December)\s*\d{1,2}(st|nd|rd|th)*\s*(,)?\s*(\d{4}|\d{2})))/i;
+var REGEX_KEY_LINE = /((call\s+for\s+(paper|papers))|submission|deadline)/i; //ignore case
+// regex for the line which contains paper submission deadline information
+var REGEX_PAPER_DEADLINE = /(paper(s)?)*(submission|deadline)(paper(s)?)*/i;
 
-function find_key_line(line){
-    return regex_key_line.test(line);
+// verifies if a line contains the information of a call for paper email,
+// returning a true value in positive case
+function has_key_line(line){
+    return REGEX_KEY_LINE.test(line);
 }
 
-// returns -1 if no match is found
-// otherwise, returns the index of the match
-// see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/search
-//  or https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions?redirectlocale=en-US&redirectslug=JavaScript%2FGuide%2FRegular_Expressions#Working_with_regular_expressions
-function find_date(line){
-    return line.search(regex_date);
+// verifies if the line contain the keywords for paper submission deadline date,
+// returning a true value in positive case
+function is_paper_deadline(line){
+    return line.test(REGEX_PAPER_DEADLINE);
+}
+
+// takes a GmailMessage object and process it, extracting
+function process_email(gmail_message){
+    var subject = get_subject_text(gmail_message);
+    var lines_body = break_lines(get_message_text(gmail_message));
+    for (line in lines_body){
+        if (has_date(line) && is_paper_deadline(line)){
+            var iso_date = get_iso_date(get_literal_date(line));
+            // TODO: create Google Calendar entry
+        }
+    }
 }

utils.js

@@ -0,0 +1,8 @@
+// modified from http://beckism.com/2010/09/splitting-lines-javascript/
+// modified from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Using_regular_expression_to_split_lines_with_different_line_endingsends_of_lineline_breaks
+var LINE_BREAKS = /^.*((\r\n|\n|\r)|$)/gm;
+
+function break_lines(string){
+    // return string.match(LINE_BREAKS);
+    return string.split(LINE_BREAKS);
+}