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For this particular parser, instead of reading the results at the end we will accumulate results as we go, populating the key_values dictionary with each key=value we encounter The left and right brackets and the equals signs are important elements of the grammar, but are of no interest in themselves So for each of them we create a Suppress() parser element this will match the appropriate character, but won t include the character in the results (We could have written each of them individually, for example, as left_bracket = Suppress("["), and so on, but using the built-in map() function is more convenient) The de nition of the ini_header parser element follows quite naturally from the BNF: a left bracket, then any characters except a right bracket, and then a right bracket We haven t de ned a parse action for this parser element, so although the parser will match any occurrences that it encounters, nothing will be done with them, which is what we want

The key_value parser element is the one we are really interested in This matches a word a sequence of alphanumeric characters, followed by an equals sign, followed by the rest of the line (which may be empty) The restOfLine is a prede ned parser element supplied by PyParsing Since we want to accumulate results as we go we add a parse action (a function reference) to the key_value parser element this function will be called for every key=value that is matched Although PyParsing provides a prede ned pythonStyleComment parser element, here we prefer the simpler Literal("#") followed by the rest of the line (And thanks to PyParsing s smart operator overloading we were able to write the literal # as a string because when we concatenated it with another parser element to produce the comment parser element, PyParsing promoted the # to be a Literal()) The parser itself is a parser element that matches one or more ini_header or key_value parser elements, and that ignores comment parser elements

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def accumulate(tokens): key, value = tokens key = keylower() if lowercase_keys else key key_values[key] = value

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The last thing to consider is how to determine whether an application was launched based on an invitation from People Near Me To do this we class This is need to get an instance of the property on the available from the static class Listing 1211 also shows how this class can be used to determine if the application was launched because of invitation and how to access any additional data sent with that invitation

This function is called once for each key=value match The tokens parameter is a tuple of the matched parser elements In this case we would have expected the tuple to have the key, the equals sign, and the value, but since we used Suppress() on the equals sign we get only the key and the value, which is exactly what we want The lowercase_keys variable is a Boolean created in an outer scope and that for pls les is set to True (Note that for ease of explanation we have shown this function after the creation of the parser, although in fact it must be de ned before we create the parser since the parser refers to it)

try: parserparseFile(file) except ParseException as err: print("parse error: {0}"format(err)) return {} return key_values

With the parser set up we are ready to call the parseFile() method, which in this example takes the name of a pls le and attempts to parse it If the parse fails we output a simple error message based on what PyParsing tells us At the end we return the key_values dictionary or an empty dictionary if the parsing failed and we ignore the parseFile() method s return value since we did all our processing in the parse action

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In the previous section s second subsection we created a handcrafted regexbased parser for m3u les In this subsection we will create a parser to do the same thing, but this time using the PyParsing module An extract from a m3u le is shown in Figure 146 (523 ), and the BNF is shown in Figure 147 (523 ) As we did when reviewing the previous subsection s pls parser, we will review the m3u parser in three parts: rst the creation of the parser, then the helper function, and nally the call to the parser Just as with the pls parser, we are ignoring the parser s return value and instead populating our data structure as the parsing progresses (In the following two subsections we will create parsers whose return values are used)

songs = [] title = restOfLine("title") filename = restOfLine("filename") seconds = Combine(Optional("-") + Word(nums))setParseAction( lambda tokens: int(tokens[0]))("seconds") info = Suppress("#EXTINF:") + seconds + Suppress(",") + title entry = info + LineEnd() + filename + LineEnd() entrysetParseAction(add_song) parser = Suppress("#EXTM3U") + OneOrMore(entry)

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