a small / simple search engine

objective : the tool analyses a text file and returns information about it's content , it can be considered as a simple search engine

illustration : this code uses an in-order linked list to build a file indexing and search engine service. The program will be passed a text file name and a file that contains commands. the code is expected to

• read the input file word-by-word
• each word is then inserted into the in-order list, along with the line number in which it exists in the file. First line in the file is line #1. Note: words are considered to be case insensitive

examples :

• wordCount input: a4.exe FileName CommandsFile wordCount exists in the CommandsFile output: 1010 words

• distWords input: a4.exe FileName CommandsFile distWords exists in the CommandsFile output: 10 distinct words

• charCount input: a4.exe FileName CommandsFile charCount exists in the CommandsFile output: 50121 characters

• frequentWord input: a4.exe FileName CommandsFile frequentWord exists in the CommandsFile output: Most frequent word is: book good

• countWord input: a4.exe FileName CommandsFile countWord Nile exists in the CommandsFile output: Nile is repeated 50 times

• starting input: a4.exe FileName CommandsFile starting Te exists in the CommandsFile output: Temporary 10 Tease 5

• containing input: a4.exe FleName CommandsFile containing al exists in the CommandsFile output: al 5 shall 2

• search input: a4.exe FileName CommandsFile search ne exists in the CommandsFile output: (separate word and line occurrences by tabs) neighbor: lines 5 62 123 network: lines 12 17 278 next: lines 110 114 119 1234

NOTES:

• The following is a sample CommandFile wordCount distWords charCount containing mega countWord Biology ending migo ==> should produce "Unde�ned command" error search class

• error handling is done using the following error messages
  File not found Undefined command Incorrect number of arguments