make && java AssignmentThree ‹needleFileName› ‹haystackFileName›

Note: Add "test" as argument 3 to view test printing that visually shows what is happening.

TestRunner accepts a class-name as an argument, and ignores any methods in the given class that A) don't return boolean or Boolean or B) has any arguments. The name of the method is converted from camelCase or snake_case to space separated sentences (and numbers are prepended with a space). The tests then start and run whatever code is in the test. If the return value is true, the test has passed and the next test will start, otherwise a log of the completed tests and their statuses will be printed. Feel free to use it for any purpose. Could be useful for assignments.

Run the command 'make test'.

If you want to disable a test simply prefix its name with IGNORE (case insensitive). I prefer IGNORE_

The tests make use of the is-functions, which tests whether the first and second arguments are equal and logs it to the console. The third argument is a string specifying a reason for why the test should return a given value. Needs to be implemented into PerformTests though.

The search algorithm is 'bad character shift', and its primary part is located under StringSearch.search().

I start by setting the offset variable to be the index of the last character of the needle and search backwards through the needle and haystack. If I a non-matching letter pair is found I increment base with its bad char shift number and reset the offset (too the length of needle).

In createBcs() I first determine the char shift for the letters in the needle, and then determine it for all letters whose value is 0 – which is the default value in an int-array and is the value of the last letter in the needle.

Notes on variable names and uses:

• base + offset: index in haystack at any point in the search
• offset: index in needle at any point in the search
• bsc, createBsc: I use bsc as an abbreviation for bad character shift

AssignmentThree.java

I fail to find any errors :)