Mr. Proper
Nabil Shahid
William Blinn
Jeff Lin
Matthew Anderegg
Who is Mr. Proper…
… and why did we name our language after
him?
Step 1. Do hours of work on O.S.
assignment.
Step 2. Google for hints on how to compile.
Step 3. Make mrproper
Step 4. Cry.
What is MrProper?
A multi format log file manipulation
language.
• Easy to use
• Powerful
• Multi chat client support
• Log file manipulation
Mrp: Easy to Use
 Hides complexity.
 Logs become primary data type.
 Log manipulation akin to integer manipulation.
Mrp: Powerful
 Broad functionality.
 Analysis of conversations.
 Lexical and syntactic analysis.
 Text transcription of log files.
Mrp: Multi Chat Client Support
 Scalable to support other log formats from
various chat clients.
 Current built in support for:
 AIM
 Trillian
 Plain text
Mrp: Log File Manipulation
 Eliminates file read/write overhead from
user programs.
 Built in operations such as loading,
parsing, saving, and converting log
formats.
Why Mr.Proper?
 Find links that friends send you.
 Search logs for expressions, words,
phrases.
 Easily convert old conversation logs when
switching chat clients.
 Parse and format conversation logs to
make online publishing easier.
Type System
Control Structures
 Expressions
 log l = open(“logroot”, “screenName”, 0);
 int x = a + b + 1;
 Loops
 int i;
for (i = 1:10) { print (“hello”); }
 Functions
 func log addLogs (log oldLog) {
// code
}
String Functions
 print() – Prints a string to standard out.
 void print (string boo);
 strLength() – Returns the length of a string as an integer.
 int strLength (string foo)
 concat() – Joins two strings and returns the result.
 string concat (string moo, string noo);
 substr() – Returns part of the input string as a new string.
 string substr (string poo, int offset, int length);
 contains() – Searches one string for another (using
regexps) and returns a boolean.
 bool contains (string line, string regexp)
Log File Manipulation Functions
 createLog() – Creates an empty log.
 open() – Loads a log file into the program.
 save() – Writes log file back to disk.
 convert() – Covert log from one format to
another.
 logLength() – Returns the number of
messages in the log.
Log Message Functions
 getMessageName() – Returns the name of the
person who wrote the message.
 getText() – Returns the text of the message.
 getTime() – Returns time of message as number of
seconds elapsed since 01/01/1970.


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createMessage() – Creates a new empty message.
setName() – Modifies the name in the message.
setText() – Modifies the text of the message.
setTime() – Modifies the time of the message.
Sample Code
func int foo(int x) { return x + 3; }
main {
int x = 0;
for(i = 1:3) {
x += foo(x);
}
print(x);
}
This program will output the value 15
Log File Manipulation: Function
func int wordCount(string word, string path) {
log myLog = open(path, “mybuddy”, 1);
int i;
int length = logLength(myLog) -1 ;
int count = 0;
string text;
for (i = 0:length) {
text = getText(getMessage(myLog, i));
if (contains(text, word)) {
count += 1;
}
}
return count;
}
Log File Manipulation: Main
main {
int count = wordCount(“hello”, “/mylogs/trillian”);
print(count);
}
Program trace?
Execution of an Mrp Program
 MrProper is an interpreted language.
 The interpreter takes in a file containing Mrp
code, and the instructions are executed as they
are encountered.
Testing Plan
 Test each component as a module.
 .mrp test scripts to go over every part of the





language.
Manual and automated semantic error checking.
Test all data types.
Control flow.
Input/output files.
Test component interaction.
Lessons Learned
 Understand the basic tools
before you try to use them and
before assuming that
something is wrong with the
code.
 Create a more detailed project
plan. Don’t rely on given
milestones.
 Learn to balance working
together and dividing up tasks.
The Bright Future of Mr. Proper
 Added support for other chat clients.
 User defined log formats for reading and
writing.
 Graphical interface for browsing and
searching through log files (tree?)