ASP.NET Web PDF Document Viewer/Editor Control Library

In this chapter we ve looked at how to deploy Ruby programs and libraries, as well as how to make their functions available to Web browsers and to other applications over a network We ve also interrogated the environment so we can pursue different techniques on a per operating-system basis if we choose Let s reflect on the main concepts covered in this chapter: Shebang line: A special line at the start of a source code file that determines which interpreter is used to process the file Used primarily on Unix-based operating systems, shebang lines can also work on Windows when used with the Apache Web server RUBY_PLATFORM: A special variable preset by Ruby that contains the name of the current platform (environment) Environment variables: Special variables set by the operating system or other processes that contain information relevant to the current execution environment and information about the operating system.

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As you ll recall from writing your story template in s 4 and 5, you never got around to writing Act III of your story the resolution. You will quickly take care of the end of your story now with a couple of mouse clicks. A classic way to end a story is to back out the way you came in, and you can end your story the same way by holding down the Ctrl key while you select your Point A and Point B slides along with your Call to Action slide. With these slides selected, press Ctrl+D to duplicate the three slides. Now drag these duplicated slides to the end of the presentation, following the last Detail slide of Act II. Here you might differentiate these slides graphically from their Act I counterparts by hiding the headlines, as shown in Figure 8-22.

RubyForge: A centralized repository and Web site dedicated to hosting and distributing Ruby projects and libraries You can find it at http://rubyforgeorg/ CGI: Common Gateway Interface A standard that enables Web servers to execute scripts and provide an interface between Web users and scripts located on that server WEBrick: A simple and easy HTTP server library for Ruby that comes with Ruby as standard Mongrel: A more powerful HTTP server library for Ruby by Zed Shaw that improves significantly upon WEBrick s speed, stability, and overall performance RPC: Remote Procedure Call A way to call methods in a different program using a network (either local or the Internet), a transport protocol (such as HTTP), and a messaging protocol (such as XML) XML-RPC: An RPC protocol that uses HTTP and XML for its transport and messaging SOAP: Simple Object Access Protocol.

Another RPC protocol that uses HTTP and XML for its transport and messaging DRb: Distributed Ruby A Ruby-only mechanism for implementing RPCs and object handling between separate Ruby scripts In 15 we re going to return to looking at network servers, albeit in a different fashion, but first, in 11, we re going to take a look at some more advanced Ruby topics to flesh out the ideas we ve covered so far..

ou ve seen strings before, and know how to make them. You ve also looked at how to access their individual characters by indexing and slicing. In this chapter, you see how to use them to format other values (for printing, for example), and take a quick look at the useful things you can do with string methods, such as splitting, joining, searching, and more.

Making substitutions and extracting certain text from strings is useful, but sometimes you merely want to check whether a certain string matches against the pattern of your choice. You might want to establish quickly if a string contains any vowels:

FIGURE 8-22 The Point A, Point B, and Call to Action slides duplicated as the closing Act III slides, with the

puts "String has vowels" if "This is a test" =~ /[aeiou]/

In this example, =~ is another form of operator, a matching operator. If the string matches the regular expression following the operator, then the expression is true. You can, of course, do the opposite: