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The customer was really happy about the extra work we picked up. The developers are starting to get more comfortable about estimating in front of everyone, but they are still concerned that when they go over or under their estimate, it reflects badly on them. I reinforced the notion that the team and individual velocities would not be used for anything else but a tool to keep them from overcommitting their time to the customer. It will probably take a few more iterations before they start to believe this.

In this section, you will look at how to use fslex.exe and fsyacc.exe, two tools that are available with F# and were created by the F# to create the parser for the F# language.

Note Although it is the most common, qwerty isn t the only keyboard layout; there are other keyboards

Note fslex.exe and fsyacc.exe are based on the ocamllex.exe and ocamlyacc.exe tools available with the O Caml distribution.

The acceptance testers are concerned about the fact that their time is not being taken into account. They also are worried that the developers may be delivering new functionality to them at the very end of the iteration. I told the team that all new development needs to be completed by the last Wednesday of each iteration, and only bug fixes should be handled the last two days. If there aren t any bug fixes, the team could decide to either take on some very small stories or spike future stories scheduled for the release. As for accounting for the acceptance testers times, this isn t defined well in XP I said I . would check the Web to see what other XP folks are doing. It looks like we might have to define our own process to handle this better.

such as AZERTY and Dvorak. The same keyboard constants may be used, but the keys may be at a different location on the keyboard. If you give the player the option of selecting their own keys for use in the game, they can select the controls that are most appropriate for their keyboard.

As discussed in the previous chapter, creating a language can be broken down into two steps: parsing the user input and then acting on the input. These are called the frontend and the backend. This

There are two ways to detect a key press in Pygame. One way is to handle KEYDOWN events, which are issued when a key is pressed, and KEYUP events, which are issued when the key is released. This is great for typing text because we will always get keyboard events even if a key has been pressed and released in the time since the last frame. Events will also capture very quick taps of the key for fire buttons. But when we use keyboard input for movement, we simply need to know if the key is pressed or not before we draw the next frame. In this case, we can use the pygame.key module more directly. Every key on the keyboard has a key constant associated with it, which is a value we can use to identify the key in code. Each constant begins with K_. There are letters (K_a to K_z), numbers (K_0 to K_9), and many other constants such as K_f1, K_LEFT, and K_RETURN. See the Pygame documentation for a complete list (www.pygame.org/docs/ref/key.html). Since there are constants

chapter will focus exclusively on the frontend, but it s worth reminding ourselves what the AST from the previous chapter looked like. module Strangelights.ExpressionParser.Ast type Expr = | Ident of string | Val of System.Double | Multi of Expr * Expr | Div of Expr * Expr | Plus of Expr * Expr | Minus of Expr * Expr

Summary

Tokenizing the text (sometimes called lexical analysis or lexing) basically means breaking up the text into manageable lumps, or tokens To do this, you use the tool fslexexe, which is itself a DSL for creating lexers (sometimes called scanners), programs, or modules for tokenizing text The program fslexexe is a command-line application that takes a text file representing the lexer and turns into an F# file that implements the lexer An fslexexe file has the extension fsl The file can have an optional header, which is placed between braces ({}) and is pure F# code, generally used to open modules or possibly to define helper functions The rest is used to define the regular expressions that make up the lexer.