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for K_a to K_z, you may expect there to be equivalent uppercase versions but there aren t any. The reason for this is that capital letters are the result of combining keys together (Shift + key). If you need to detect capital letters, or other Shifted keys, use the unicode parameter in key events that contain the result of such key combinations. We can use the pygame.key.get_pressed function to detect whether a key is pressed. It returns a list of booleans (True or False values), one for each of the key constants. To look up a particular key, use its constant as an index into the pressed list. For example, if we were using the spacebar as a fire button, we might write the trigger code like this: pressed_keys = pygame.key.get_pressed() if pressed_keys[K_SPACE]: # Space key has been pressed fire() Let s write a script to experiment with the keyboard. Listing 6-1 uses the get_pressed function to detect any pressed keys and displays a list of them on the screen.

In this iteration planning phase, we started with the remaining user stories in the release. Because their story points did not add up to the team s velocity for the iteration, the customer was able to pull more functionality into the iteration and the release. In this case, we went all the way back to the stories that were originally outside the release plan. Lastly, we made sure that all the developers had signed up for as much work as possible without overcommitting themselves.

You can bind a regular expression to an identifier using the let keyword, like this let digit = ['0'-'9'] or you can define a regular expression as part of a rule A rule is a collection of regular expressions that are in competition to match sections of the text A rule is defined with the keyword rule and followed by a name for the rule and then an equal sign and the keyword parse Next are the definitions of the regular expressions, which should be followed by an action, which is an F# expression surrounded by braces Each rule is separated by a vertical bar (|) Each rule will become a function that is capable of matching against a stream of text If a match is found, then the rule fires and the F# expression is executed If several regular expressions match the rule, then the longest match is used.

Listing 6-1. Testing Pressed Keys (keydemo.py) import pygame from pygame.locals import * from sys import exit pygame.init() screen = pygame.display.set_mode((640, 480), 0, 32) font = pygame.font.SysFont("arial", 32); font_height = font.get_linesize() while True: for event in pygame.event.get(): if event.type == QUIT: exit() screen.fill((255, 255, 255)) pressed_key_text = [] pressed_keys = pygame.key.get_pressed() y = font_height

The value returned by the function is the value returned by the action This means that each action must be of the same type If no match is found, then an exception is raised Although the actions can be any valid F# expressions, it s normal to return the token declarations that you will make in the fsyacc file See the next section, Generating a Parser: Fsyacc, for more information about this If you want to use the lexer on its own, you will place whatever logic you want to happen here, such as writing the token to the console or storing the token found in a list The following example shows a file that is capable of tokenizing your little language You usually do one of two things in the actions.

n the previous chapter, we developed an iteration plan for the second iteration of our sample project. Now we will work on this iteration. Again, we will demonstrate the XP practices that occur during an iteration from a developer s perspective. We won t cover all the activities that occur during an iteration; refer to s 5 and 13 if you need that information. This chapter builds on the source code presented in 13, so make sure you have completed that chapter s coding before proceeding.