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Both the INI_HEADER and COMMENT tokens matchers are simple regexes, and since both use the t_ignore_ pre x, both will be correctly matched and then discarded An alternative approach to ignoring matches is to de ne a function that just uses the t_ pre x (eg, t_COMMENT()), and that has a suite of pass (or return None), since if the return value is None the token is discarded For the KEY and VALUE tokens we have used functions rather than regexes In such cases the regex to match must be speci ed in the function s docstring and here the docstrings are raw strings since that is our practice for regexes, and it means we don t have to escape backslashes When a function is used the token is passed as token object t (following the PLY examples naming conventions) of type plylexLexToken The matched text is held in the plylexLexTokenvalue attribute, and we are permitted to change this if we wish We must always return t from the function if we want the token included in the results In the case of the t_KEY() function, we lowercase the matching key if the lowercase_keys variable (from an outer scope) is True And for the t_VALUE() function, we strip off the = and any leading or trailing whitespace In addition to our own custom tokens, it is conventional to de ne a couple of PLY-speci c functions to provide error reporting

Retrieve the resource identi ed by the URI Send a resource to the server based on the resource identi ed by the URI Store a resource based on the resource identi ed by the URI Delete a resource based on the resource identi ed by the URI Identical to GET except that the response is not returned This is used to retrieve metadata for the resource identi ed by the URI

def t_newline(t): r"\n+" tlexerlineno += len(tvalue) def t_error(t): line = tvaluelstrip() i = linefind("\n") line = line if i == -1 else line[:i] print("Failed to parse line {0}: {1}"format(tlineno + 1, line))

The token s lexer attribute (of type plylexLexer) provides access to the lexer itself Here we have updated the lexer s lineno attribute by the number of newlines that have been matched Notice that we don t have to speci cally account for blank lines since the

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10, "MIDP High-Level User Interface Form," introduces the part of the MIDP high-level user interface revolving around the Form class

If an error occurs the t_error() function is called We print an error message and at most one line of the input We add 1 to the line number since PLY s lexerlineno attribute starts counting from 0 With all the token de nitions in place we are ready to lex some data and create a corresponding key value dictionary

HTTP verbs form the basis for how we can interact with resources on the Web GET is the most widely used HTTP verb because it is used to retrieve resources HTTP verbs help to provide a uniform interface for interacting with resources, which is a constraint based on the REST architectural style

key_values = {} lexer = plylexlex() lexerinput(fileread()) key = None for token in lexer: if tokentype == "KEY": key = tokenvalue elif tokentype == "VALUE": if key is None: print("Failed to parse: value '{0}' without key" format(tokenvalue)) else: key_values[key] = tokenvalue key = None

The lexer reads the entire input text and can be used as an iterator that produces one token at each iteration The tokentype attribute holds the name of the current token this is one of the names from the tokens list and the tokenvalue holds the matched text or whatever we replaced it with For each token, if the token is a KEY we hold it and wait for its value, and if it is a VALUE we add it using the current key to the key_values dictionary At the end (not shown), we return the dictionary to the caller just as we did with the playlistspy pls regex and PyParsing parsers

11, "MIDP Low-Level User Interface Libraries," introduces the low-level user interface libraries defined by the MIDP Specification

In this subsection we will develop a PLY parser for the m3u format And just as we did in the previous implementations, the parser will return its results in the form of a list of Song (collectionsnamedtuple()) objects, each of which holds a title, a duration in seconds, and a lename Since the format is so simple, PLY s lexer is suf cient to do all the parsing As before we will create a list of tokens, each one corresponding to a nonterminal in the BNF:

.

tokens = ("M3U", "INFO", "SECONDS", "TITLE", "FILENAME")

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