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In this parser we want to ignore spurious whitespace that may occur between tokens, and we want to do so regardless of the state the lexer is in This can be achieved by creating a t_ignore variable, and by giving it a state of ANY which means it is active in any state:

t_ANY_ignore = " \t\n"

The Java Language Specification, Second Edition, by James Gosling, Bill Joy, Guy Steele and Gilad Bracha Addison-Wesley, 2000, ISBN 0-201-31008-2

Microsoft has provided support for URIs since NET Framework v10 The class allows developers to de ne and parse basic information within a URI This class allows developers to access information such as the scheme, path, and hostname This is great for passing a URI to Web clients control or the such as the class A companion to the class is the class This class provides a way to modify the class instance These classes are the founwithout creating another dation for working with URIs based on the HTTP protocol Additional capabilities are needed to support the REST architectural style used by developers today Table 131 showed that developers embed parameters in URIs as either or query string parameters or as parts of the path The classes do not allow building and parsing of URIs based on this approach Another approach that has been used is to build and parse URIs based on patterns that specify named tokens The tokens represent the parameters that are needed to build URIs using logical substitution They also de ne how parameters can be parsed from URIs NET Framework 35

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This will ensure that any whitespace between tokens is safely and conveniently ignored We have also de ned two functions, t_ANY_newline() and t_ANY_error(); these have exactly the same bodies as the t_newline() and t_error() functions de ned in the previous subsection (556 ) so neither are shown here but include the state of ANY in their names so that they are active no matter what state the lexer is in

songs = [] title = seconds = None lexer = plylexlex() lexerinput(fhread()) for token in lexer: if tokentype == "SECONDS": seconds = tokenvalue elif tokentype == "TITLE": title = tokenvalue elif tokentype == "FILENAME": if title is not None and seconds is not None: songsappend(Song(title, seconds, tokenvalue)) title = seconds = None else: print("Failed, filename '{0}' without title/duration" format(tokenvalue))

We use the lexer in the same way as we did for the pls lexer, iterating over the tokens, accumulating values (for the seconds and title), and whenever we get a lename to go with the seconds and title, adding a new song to the song list As before, at the end (not shown), we return the key_values dictionary to the caller

introduces a new class called the that provides a consistent way for building and parsing URIs based on patterns This class de nes a pattern based on named tokens Tokens are represented in curly braces within a pattern For example, the pattern speci es a stock symbol that is sent as a query string parameter Named tokens can also be embedded as a part of the URI path and are not limited to query string parameters For example, the following pattern, , speci es a parameter within the URI path instances can be built or parsed based on these patterns We will now examine how we can class do this use the

The Java Virtual Machine Specification, Second Edition, by Tim Lindholm and Frank Yellin Addison-Wesley, 1999, ISBN 0-201-43294-3

The blocks format is more sophisticated than the key value-based pls format or the m3u format since it allows blocks to be nested inside each other This presents no problems to PLY, and in fact the de nitions of the tokens can be done wholly using regexes without requiring any functions or states at all

tokens = ("NODE_START", "NODE_END", "COLOR", "NAME", "NEW_ROWS", "EMPTY_NODE") t_NODE_START = r"\[" t_NODE_END = r"\]" t_COLOR = r"( :\#[\dA-Fa-f]{6}|[a-zA-Z]\w*):" t_NAME = r"[^][/\n]+" t_NEW_ROWS = r"/+" t_EMPTY_NODE = r"\[\]"

The regexes are taken directly from the BNF, except that we have chosen to disallow newlines in names In addition, we have de ned a t_ignore regex to skip spaces and tabs, and t_newline() and t_error() functions that are the same as before except that t_error() raises a custom LexError with its error message rather than printing the error message With the tokens set up, we are ready to prepare for lexing and then to do the lexing

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