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Now you can begin writing the IfBookmarkedNode. Obviously, it needs to subclass template. Node, and it needs to accept four arguments in its __init__() method. You ll simply store the two NodeList instances for later use when you render the template: class IfBookmarkedNode(template.Node): def __init__(self, user, snippet, nodelist_true, nodelist_false): self.nodelist_true = nodelist_true self.nodelist_false = nodelist_false But what about the user and snippet variables Right now, they re the raw strings from the template, and you don t yet know what values they ll actually resolve to when you get a look at the context. You need some way of saying that these are actually template variables that you need to resolve later on. Fortunately, that s easy enough to do: self.user = template.Variable(user) self.snippet = template.Variable(snippet) The Variable class in django.template handles the hard work for you. When given the template context to work with, it knows how to resolve the variable and gives you back the actual value it corresponds to. Now you can start to write the render() method: def render(self, context): user = self.user.resolve(context) snippet = self.snippet.resolve(context) Each Variable instance has a method called resolve(), which handles the actual business of resolving the variable. If the variable turns out not to correspond to anything, it ll even handle raising an exception django.template.VariableDoesNotExist automatically for you. Of course, you ve seen that it s usually a good idea for custom template tags to fail silently when possible, so catch that exception and just have the tag return nothing when one of the variables is invalid: def render(self, context): try: user = self.user.resolve(context) snippet = self.snippet.resolve(context) except template.VariableDoesNotExist: return ''

Summary

It s important to explain to the participants explicitly that the API Design Fest is heavily focused on the problem of API evolution and on the related problem of functional backward compatibility. It s also important to repeat that the API includes everything on which the user will need to depend, which includes an implementation! The point of the API Design Fest is to write a functional API. Its versions will be compared to each other. That is why the correct implementation of the API is necessary, while the Javadoc is pretty much useless.

The Arduino is an incredibly useful platform, capable of controlling both practical projects and fun gadgets. It also has a very strong and enthusiastic community of developers and gadgeteers, and we hope you will enjoy becoming part of that community.

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The last observed problem after Day 1 was that some implementations were incorrect or at least allowed misuse of the API. For example, the day1/stackbasedsolution sources follow: /** * Create a circuit to evaluate x1 and x2 and then * verify that its result is false for input (false, true) and * it is true for input (true, true). */ public void testX1andX2() { Stack<Character> s = new Stack<Character> (); s.addAll(Arrays.asList('1', '1')); assertEquals("'1' for '11' input.", '1', CircuitFactory.getBasicCircuit(Operation.AND).evaluate(s)); s.addAll(Arrays.asList('1', '0')); assertEquals("'0' for '10' input.", '0', CircuitFactory.getBasicCircuit(Operation.AND).evaluate(s)); } /** * Create a circuit to evaluate (x1 and x2) or x3 and then * verify that its result is false for input (false, true, false) and * it is true for input (false, false, true). */ public void testX1andX2orX3() { Stack<Character> s = new Stack<Character> (); s.addAll(Arrays.asList('0', '1', '0')); assertEquals("'0' for '010' input.", '0', CircuitFactory.join(CircuitFactory.getTrivialCircuit(), CircuitFactory.getBasicCircuit(Operation.OR), Operation.AND).evaluate(s) ); s.addAll(Arrays.asList('0', '0', '1')); assertEquals("'1' for '001' input.", '1', CircuitFactory.join(CircuitFactory.getTrivialCircuit(), CircuitFactory.getBasicCircuit(Operation.OR), Operation.AND).evaluate(s) ); } /**

If you get past this point, then you know that these variables resolved successfully, and you can use them to query for an existing Bookmark. The only tricky thing now is what to return in each case. You have two NodeList instances, and you want to render one or the other according to whether the user has bookmarked the snippet. Fortunately, that s easy. Just as a Node must have a render() method that accepts the context and returns a string, so too must NodeList: if Bookmark.objects.filter(user__pk=user.id, snippet__pk=snippet.id): return self.nodelist_true.render(context) else: return self.nodelist_false.render(context) Now you have a finished tag. After you register it, cab/templatetags/snippets.py looks like this: from django import template from cab.models import Bookmark def do_if_bookmarked(parser, token): bits = token.contents.split() if len(bits) != 3: raise template.TemplateSyntaxError("%s tag takes two arguments" % bits[0]) nodelist_true = parser.parse(('else', 'endif_bookmarked')) token = parser.next_token() if token.contents == 'else': nodelist_false = parser.parse(('endif_bookmarked',)) parser.delete_first_token() else: nodelist_false = template.NodeList() return IfBookmarkedNode(bits[1], bits[2], nodelist_true, nodelist_false)

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