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The file starts by checking for an include guard variable to make sure it hasn t already been invoked, then sets the variable This is the same technique as explained in more detail in Writing An Arduino Library in 16 #ifndef WSR_H_ #define WSR_H_ It then defines some human-readable tokens for use in the main program using a compiler directive called a define Lines starting with #define are not technically part of the sketch itself, but are commands to the compiler that tell it to process the source files in a certain way A #define sets up a convenient token that can be used elsewhere in the sketch as an alias for an actual value.

1. Mads Torgersen, The Expression Problem Revisited in ECOOP 2004 Object Oriented Programming: 18th European Conference Oslo, Norway, June 14 18 2004, Proceedings, ed. Martin Odersky, 123 146 (Berlin: Springer-Verlag, 2004).

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Now that you have the {% if_rated %} tag, you can add a second, complementary tag, to retrieve the user s rating for a particular snippet. That lets you set up a template like so: {% load snippets %} {% if_rated user snippet %} {% get_rating user snippet as rating %} <p>You rated this snippet <strong>{{ rating.get_rating_display }}</strong>.</p> {% endif_rated %} When a user has rated a snippet, this should end up displaying something like, You rated this snippet useful. The compilation function is straightforward: def do_get_rating(parser, token): bits = token.contents.split() if len(bits) != 5: raise template.TemplateSyntaxError("%s tag takes four arguments" % bits[0]) if bits[3] != 'as': raise template.TemplateSyntaxError("Third argument to %s must be 'as'" % bits[0]) return GetRatingNode(bits[1], bits[2], bits[4]) The Node class is also easy. You just need to resolve the two variables, retrieve the Rating, and put it into the context: class GetRatingNode(template.Node): def __init__(self, user, snippet, varname): self.user = template.Variable(user) self.snippet = template.Variable(snippet) self.varname = varname def render(self, context): try: user = self.user.resolve(context) snippet = self.snippet.resolve(context) except template.VariableDoesNotExist: return '' rating = Rating.objects.get(user__pk=user.id, snippet__pk=snippet.id) context[self.varname] = rating return '' Next, you register the tag: register.tag('get_rating', do_get_rating)

The easiest way to understand how #define works is to think of it as a predefined rule for a global find/replace through the code, and that rule is run for you automatically just before the sketch is compiled By defining a token and then using it in your code, it s as if you wrote out the value directly The first couple of #define entries are a trivial example, setting up aliases for variable types unsigned int and signed int so they can be referred to in the sketch as simply uint and sint This is purely a personal preference by the programmer and not necessary for the sketch to function: variable declarations in the program could have used the original, longer version of the variable type instead, but doing this makes the sketch a little easier to read if you re accustomed to the uint/sint convention.

typedef unsigned int uint; typedef signed int sint; Next, it defines three constants starting with ASCIINUMBASE, which as its name suggests is a token representing the ASCII number base (ie, the position of the number 0 in the ASCII code table) and is given a hex value of 0x30 Note that a define is not at all the same thing as a variable because it can t be changed after the program has been compiled In this case, the ASCIINUMBASE token is removed from anywhere it appears in the program code and replaced with the literal value 0x30, so doing things this way results in exactly the same program as if ASCIINUMBASE had never been defined and everywhere it occurred we had simply typed 0x30 instead The carriage return and linefeed characters are also defined in the same way.

you don t want to use because it might scare your users No wonder the compiler team preferred the solution involving adding methods into interfaces For practical reasons it s easier, but as a mental exercise it s insufficient So, let s look at other ways of solving the problem Although the javaxlangmodel package initiated the problem, it s not restricted to that domain In fact, it appears whenever you use a visitor in an API Evolving a visitor is difficult The methods in the visitor interface are defined once However, the data structures it operates on might need to evolve The question is what to do in this situation Adding methods to the visitor interface is kind of a solution However, it s a bit bulldozer-like : not something a rational mind would be proud of.

#define ASCIINUMBASE 0x30 #define CHAR_CR 0x0D #define CHAR_LF 0x0A So far it probably sounds like a waste of time setting up all these #define entries Often the token is longer than the value it represents, so rather than saving typing in the sketch it actually makes it longer So why bother The two major reasons are consistency and readability of the main program code By defining ASCIINUMBASE once like this, and then using that token throughout the program, it s easy to change its value in one place if necessary.

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