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The corresponding client code for setting the mesh password is shown approach described in Listing 124 This example uses the in 3, Channels

block has no name and the color white The children list contains Blocks and Nones the latter representing new row markers Rather than rely on users of the Block class remembering all of these conventions, we have provided some module methods to abstract them away

Each Graphics object has a single rectangular clip region; only those pixels within the clip region are modified by graphics operations Operations are provided for intersecting the current clip rectangle with a given rectangle (GraphicsclipRect) and for setting the current clip rectangle outright (GraphicssetClip) The methods GraphicsgetClipWidth, GraphicsgetClipHeight, GraphicsgetClipX, and GraphicsgetClipY are used for obtaining the current clip region

class Block: def __init__(self, name, color="white"): selfname = name selfcolor = color selfchildren = [] def has_children(self): return bool(selfchildren)

The Block class is very simple The has_children() method is provided as a convenience for the BlockOutputpy module We haven t provided any explicit API for adding children, since clients are expected to work directly with the children list attribute

WCF can use PNRP to discover other participants on a mesh network In its implementation, the WCF peer channel abstracts away the use of PNRP so

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get_root_block = lambda: Block(None, None) get_empty_block = lambda: Block("") get_new_row = lambda: None is_new_row = lambda x: x is None

[ Team LiB ]

These four tiny helper functions provide abstractions for the Block class s conventions They mean that programmers using the Block module don t have to remember the conventions, just the functions, and also give us a little bit of wiggle room should we decide to change the conventions later on Now that we have the Block class and supporting functions (all de ned in the Blockpy module le imported by the blockspy program that contains the parser), we are ready to write a blk parser The parser will create a root block and populate it with children (and children s children, etc), to represent the parsed blk le, and which can then be passed to the BlockOutputsave_blocks_as_svg() function The parser is a recursive descent parser this is necessary because the blocks format can contain nested blocks The parser consists of a Data class that is initialized with the text of the le to be parsed and that keeps track of the current parse position and provides methods for advancing through the text In addition, the parser has a group of parse functions that operate on an instance of the Data class, advancing through the data and populating a stack of Blocks Some of these functions call each other recursively, re ecting the recursive nature of the data which is also re ected in the BNF

We will begin by looking at the Data class, then we will see how the class is used and the parsing started, and then we will review each parsing function as we encounter it

an application does not need to work with PNRP directly However, some peer application might like to publish and resolve identi ers (peer names) themselves outside of the WCF peer channel Unfortunately, prior to NET Framework 35 there was no way from managed code to register PNRP was added in NET names A new namespace called Framework 35 to be able to work with the PNRP infrastructure using managed code

class Data: def __init__(self, text): selftext = text selfpos = 0 selfline = 1 selfcolumn = 1 selfbrackets = 0 selfstack = [Blockget_root_block()]

[ Team LiB ]

The Data class holds the text of the le we are parsing, the position we are up to (selfpos), and the (1-based) line and column this position represents It also keeps track of the brackets (adding one to the count for every open bracket and subtracting one for every close bracket) The stack is a list of Blocks, initialized with an empty root block At the end we will return the root block if the parse was successful this block will have child blocks (which may have their own child blocks, etc), representing the blocks data

def location(self): return "line {0}, column {1}"format(selfline, selfcolumn)

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