在Ruby中的文件IO期间读取下一行

Question

I am trying to import a file using ruby and parse it. Is there a way to read the next line once inside the file import? Basically I want to see if a specific line is within x lines of another important line. Like does "x phrase" Come within 10 lines of "y phrase". I don't see a way to do this -- I know its simple with Java. Thanks!

Answer 1

To read lines of a file

lines_array = IO.readlines('testfile')
lines_array.each { |l| #Do your stuff with your line }

Voilà

Ruby Docs on IO

Answer 2

You can also try:

web_contents = "c:\\path\\to\\your\\file.txt"  

File.open(web_contents).each_with_index do |line, i|  
  line.chomp!  
  puts "line #{line}, i #{i}" # Do whatever you want to here  
end  

The .each_with_index method gives you an index, i , which you can use to keep track of where on what line in your file you are. Simple maths can then yield the offset as required.