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try: result = formulaparseString(text, parseAll=True) assert len(result) == 1 return result[0]asList() except (ParseException, ParseSyntaxException) as err: print("Syntax error:\n{0line}\n{1}^"format(err, " " * (errcolumn - 1)))

This code is similar to what we used for the blocks example in the previous subsection, only here we have tried to give more sophisticated error handling In particular, if an error occurs we print the line that had the error and on the line below it we print spaces followed by a caret (^) to indicate where the error was detected For example, if we parse the invalid formula, forall x: = x & true, we will get:

wwwmsnbcmsncom/id/20265063/ http://pipesyahoocom/pipes/piperun _ id=jlM12Ljj2xGAdeUR1vC6Jw&_ render=json&merger=eg http://rssslashdotorg/Slashdot/slashdot http://api ickrcom/services/rest/ method= ickrphotossearch&api_key= 20701ea0647b482bcb124b1c80db976f&text= stocks

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In this case the error location is slightly off the error is that = x should have the form y = x, but it is still pretty good In the case of a successful parse we get a list of ParseResults which has a single result as before we convert this to a Python list Earlier we saw some example formulas; now we will look at some of them again, this time with the result lists produced by the parser, pretty printed to help reveal their structure We mentioned before that the ~ operator has a lower precedence than the = operator so let s see if this is handled correctly by the parser

3, "Goals, Requirements, and Scope," defines the goals, requirements, and scope of the CLDC and MIDP standardization efforts

# ~true -> ~b = c [ ['~', 'true'], '->', ['~', ['b', '=', 'c'] ] ] # ~true -> ~(b = c) [ ['~', 'true'], '->', ['~', ['b', '=', 'c'] ] ]

Here we get exactly the same results for both formulas, which demonstrates that = has higher precedence than ~ Of course, we would need to write several more test formulas to check all the cases, but this at least looks promising Two of the formulas that we saw earlier were forall x: x = x & true and (forall x: x = x) & true, and we pointed out that although the only difference between them is the parentheses, this is suf cient to make them different formulas Here are the lists the parser produces for them:

Each of the examples speci es a URI that takes a set of parameters that identi es a resource to retrieve Parameters are sent either as query strings or embedded as a part of the path of the URI This means that the URI is used to identify, locate, and access resources To better understand what we mean, we look at the URL used to retrieve stock quotes from Google It is obvious from the following URL that the parameter represents the stock symbol and is passed into the service as a query string parameter

# forall x: x = x & true [ 'forall', 'x', [ ['x', '=', 'x'], '&', 'true' ] ] # (forall x: x = x) & true [ [ 'forall', 'x', ['x', '=', 'x'] ], '&', 'true' ]

4, "Connected Limited Device Configuration," introduces the CLDC standardization effort and summarizes the supported Java programming language and virtual machine features compared to the Java 2 Platform, Standard Edition

The parser is clearly able to distinguish between these two formulas, and creates quite different parse trees (nested lists) Without the parentheses, forall s formula is everything right of the colon, but with the parentheses, forall s scope is limited to within the parentheses But what about the two formulas that again are different only in that one has parentheses, but where the parentheses don t matter, so that the formulas are

actually the same These two formulas are true & forall x: x = x and true & (forall x: x = x), and fortunately, when parsed they both produce exactly the same list:

What is not represented is whether this URL is accessed using an HTTP GET or some other HTTP action For now, we will assume that GET is being

[ 'true', '&', [ 'forall', 'x', ['x', '=', 'x'] ] ]

7, "MIDP Application Model," introduces the MIDlet application model defined by the MIDP Specification

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