Some programs by Arnab C

Here are some odd pieces of code that I have written. These are mainly utility programs that I developed for some personal use or for mere fun. You are free to download, use and/or mess with them. These were all written for personal use, and are mostly undocumented. So you may have to go through the code carefully in order to find out how they behave. I plan to add details of the algorithms when I find time.

Abbreviation utility:

Description: While typing a file we often need to type the same text more than once. This is a utility that lets you define an abbreviation for such frequently occuring texts.
Download: abbrev.lex
Installation: Run flex as "flex abbrev.lex" Then compile with C as "cc lex.yy.c -o abbrev"
Usage: In the text file you are writing suppose you need to use the word "automatic" 5 times. You want to abbreviate it to "aa" say. Then at the very first occurence write "aa[=automatic]" then just write "aa" for each subsequence occurence. Let the text file be called "test.txt" (the "txt" extension is required). Run "abbrev" on it as "abbrev test". It will create a file "test.1" that will have all the "aa"s expanded into "automatic". But if "aa" occurs as part of some other word (as in "Haar") then it won't get expanded, of course. If you need to write "]" in the expansion text, write "\]".

Latex mathifier:

Description: If you have ever typed a LaTeX file, you know how tedious it is to type in those silly $'s. Consider typing
If sin(x)= 0.45 then reduce \epsilon by 6^5.
It is quite obvious as it is which parts should be typeset in math-mode but still LaTeX insists that you type
If $\sin(x)= 0.45$ then reduce $\epsilon$ by $6^5.$
which is pretty annoying to type. Also, forgetting to match $'s properly is the root of many headaches while using LaTeX. This program tries to eliminate this trouble. You first type your document without the dollars (and without the backslashes for standard functions like sin, cos etc) then run the mathifier on the file. The mathifier will detect the parts that should be typeset in math-mode and put approapriate $'s around them. It has a built-in list of commonly used math-mode symbols, like \forall, \alpha etc. It considers any stand-alone letter (except `a') to be a math symbol. Also if you add your own math symbols just remember to precedde the first occurence of the symbol with `mmm' to tell mathifier to treat all occurences of that symbol as math text. Thus
If mmm\cov(x,y)= 45 then \cov(y,z) cannot be 10.
will be translated into
If $cov(x,y)= 45$ then $\cov(y,z)$ cannot be 10.
Note that the number 10 standing by itself is not put in math-mode.
Download: mathify.lex
Installation: Run flex as "flex mathify.lex" Then compile with C as "cc lex.yy.c -o abbrev"
Usage:See above.

Flash authoring tool

Description:Text-based tool to create FLASH animations.
Download:

Installationtion:

$ yacc swf.y
$ flex swf.lex
$ cc -o makeFlash y.tab.c

Usage:

$ ./makeFlash < sample.spec > AutoSWF.java
$ javac AutoSWF.java
$ java AutoSWF > test.swf