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The top-level parsing is quite simple We create an instance of the Data class based on the text we want to parse and then we call the parse() function (which we will see in a moment) to perform the parsing If an error occurs a custom LexError is raised; we simply convert this to a ValueError to insulate any caller

To create a new peer resolver, you must inherit from the abstract base This class has a number of methods on it that allow a class client to register, update, and unregister a client from a mesh network It also has a method to resolve other members of the mesh Listing 127 shows class and the con guration classes associated with it the

from the internal exceptions we use Unusually, the error message contains an escaped strformat() eld name the caller is expected to use this to insert the lename, something we cannot do here because we are only given the le s text, not the lename or le object At the end we return the root block, which should have children (and their children) representing the parsed blocks

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def parse(data): while datapos < len(datatext): if not dataadvance_up_to("[]/"): break if datatext[datapos] == "[": databrackets += 1 parse_block(data) elif datatext[datapos] == "/": parse_new_row(data) elif datatext[datapos] == "]": databrackets -= 1 dataadvance_by(1) else: raise LexError("expecting '[', ']', or '/'; " "but got '{0}'"format(datatext[datapos])) if databrackets: raise LexError("ran out of text when expecting '{0}'" format(']' if databrackets > 0 else '['))

The ImagecreateImage(Image image, int x, int y, int width, int height, int transform) method is used to create an immutable Image from the transformed region of another Image (which could be either mutable or immutable)

This function is the heart of the recursive descent parser It iterates over the text looking for the start or end of a block or a new row marker If it reaches the start of a block it increments the brackets count and calls parse_block(); if it reaches a new row marker it calls parse_new_row(); and if it reaches the end of a block it decrements the brackets count and advances to the next character If any other character is encountered it is an error and is reported accordingly Similarly, when all the data has been parsed, if the brackets count is not zero the function reports the error

Peer networks based on message ooding typically provide a way to limit the distance a message travels with the network The distance a message travels is often referred to as the number of hops it makes when traveling on the network The number of hops is determined by counting the number of times a message is sent between neighbors For those familiar with socket programming, this is similar to the Time-to-Live (TTL) setting on the TCP protocol, which speci es the maximum number of routers a packet can traverse before being discarded Figure 127 illustrates this point by representing nodes that are connected Four nodes are labeled A, B, C, and D A message sent by Node A will make three hops to be received by Node D The number of hops can be signi cant when working with Internet-scale meshes We look for ways to limit the number of hops when we encounter these situations

def parse_block(data): dataadvance_by(1) nextBlock = datatextfind("[", datapos) endOfBlock = datatextfind("]", datapos) if nextBlock == -1 or endOfBlock < nextBlock: parse_block_data(data, endOfBlock) else: block = parse_block_data(data, nextBlock)

datastackappend(block) parse(data) datastackpop()

This function begins by advancing by one character (to skip the start-of-block open bracket) It then looks for the next start of block and the next end of block If there is no following block or if the next end of block is before the start of another block then this block does not have any nested blocks, so we can simply call parse_block_data() and give it an end position of the end of this block If this block does have one or more nested blocks inside it we parse this block s data up to where its rst nested block begins We then push this block onto the stack of blocks and recursively call the parse() function to parse the nested block (or blocks and their nested blocks, etc) And at the end we pop this block off the stack since all the nesting has been handled by the recursive calls

The ImagecreateRGBImage(int[] rgb, int width, int height, boolean alpha) method is used to create an immutable Image from an array of RGB color values, either with or without alpha channel data

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