How to resolve the algorithm Abbreviations, simple step by step in the Ruby programming language

Published on 12 May 2024 09:40 PM

How to resolve the algorithm Abbreviations, simple step by step in the Ruby programming language

Table of Contents

Problem Statement

The use of   abbreviations   (also sometimes called synonyms, nicknames, AKAs, or aliases)   can be an easy way to add flexibility when specifying or using commands, sub─commands, options, etc.

For this task, the following   command table   will be used:

Notes concerning the above   command table:

For a user string of: the computer program should return the string:

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Abbreviations, simple step by step in the Ruby programming language

The provided Ruby code is a program that takes a string containing a list of commands and their corresponding word sizes, and then parses a test string to identify the commands and their word sizes. Here's a breakdown of the code:

  1. String Preprocessing:

    • The input string str contains a list of commands and their word sizes.
    • The string is converted to uppercase using str.upcase.
    • The gsub! method is used to modify the string by replacing each occurrence of a command and word size pair with the command, a space, the word size, and another space. This is done twice to ensure that all commands have word sizes.
  2. Hash Creation:

    • The modified string str is split into an array of key-value pairs.
    • The transform_values(&:to_i) method is used to convert the word size values to integers.
    • The key-value pairs are used to create a hash table that maps commands to their word sizes.
  3. Test String Parsing:

    • A test string test is defined.
    • The test string is split into an array of words ar.
  4. Command Identification:

    • The map method is used to iterate through the words in the test string ar.
    • For each word w, it searches the table hash for a matching command that starts with w and has a word size greater than or equal to the length of w.
    • If a matching command is found, it is stored in res[0].
    • If no matching command is found, an "error" string is used instead.
  5. Output:

    • The modified array ar is joined into a single string, with the commands and their word sizes separated by spaces.
    • The resulting string is printed using puts.

In summary, this code parses a test string to identify the commands and their word sizes based on a provided list of commands and word sizes. It demonstrates string manipulation, hash usage, and array iteration in Ruby.

Source code in the ruby programming language

str = "add 1  alter 3  backup 2  bottom 1  Cappend 2  change 1  Schange  Cinsert 2  Clast 3 
   compress 4 copy 2 count 3 Coverlay 3 cursor 3  delete 3 Cdelete 2  down 1  duplicate
   3 xEdit 1 expand 3 extract 3  find 1 Nfind 2 Nfindup 6 NfUP 3 Cfind 2 findUP 3 fUP 2
   forward 2  get  help 1 hexType 4  input 1 powerInput 3  join 1 split 2 spltJOIN load
   locate 1 Clocate 2 lowerCase 3 upperCase 3 Lprefix 2  macro  merge 2 modify 3 move 2
   msg  next 1 overlay 1 parse preserve 4 purge 3 put putD query 1 quit  read recover 3
   refresh renum 3 repeat 3 replace 1 Creplace 2 reset 3 restore 4 rgtLEFT right 2 left
   2  save  set  shift 2  si  sort  sos  stack 3 status 4 top  transfer 3  type 1  up 1"

RE = /(?<word1>[a-zA-Z]+)\s+(?<word2>[a-zA-Z]+)/
str = str.upcase
# add missing wordsizes
2.times{ str.gsub!(RE){ [  $~[:word1], $~[:word1].size, $~[:word2] ].join(" ")} }

table = Hash[*str.split].transform_values(&:to_i)

test =  "riG   rePEAT copies  put mo   rest    types   fup.    6       poweRin"
ar = test.split.map do |w|
  (res = table.detect{|k,v| k.start_with?(w.upcase) && w.size >= v}) ? res[0] : "*error*"
end

puts ar.join(" ")


  

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