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We de ne nodes to be a Forward() parser element, since we need to use it before we specify what it matches We have also introduced a new parser element that isn t in the BNF, node_data, which matches the optional color and optional name We give this parser element a parse action that will create a new Block, so each time a node_data is encountered a Block will be added to the parser s results list The node parser element is de ned very naturally as a direct translation of the BNF Notice that both the node_data and nodes parser elements are optional (the former consisting of two optional elements, the latter quanti ed by zero or more), so empty nodes are correctly allowed Finally, we can de ne the nodes parser element Since it was originally created as a Forward() we must append parser elements to it using << Here we have set nodes to be zero or more of an optional new row and one or more nodes Notice that we put node before empty_node since PyParsing matches left to right we normally order parser elements that have common pre xes from longest to shortest matching We have also grouped the nodes parser element s results using Group() this ensures that each nodes is created as a list in its own right This means that a node that contains nodes will be represented by a Block for the node, and by a list for the contained nodes and which in turn may contain Blocks, or integers for empty nodes or new rows, and so on It is because of this recursive structure that we had to create nodes as a Forward(), and also why we must use the << operator (which in PyParsing is used to append), to add the Group() parser element and the elements it contains to the nodes element.

One important but subtle point to note is that we used the - operator rather than the + operator in the de nition of the node parser element We could just as easily have used +, since both + (ParserElement__add__()) and - (ParserElement__sub__()) do the same job they return a parser element that represents the concatenation of the two parser elements that are the operator s operands The reason we chose to use - rather than + is due to a subtle but important difference between them The - operator will stop parsing and raise a ParseSyntaxException as soon as an error is encountered, something that the + operator doesn t do If we had used + all errors would have a line number of 1 and a column of 1; but by using -, any errors have the correct line and column numbers In general, using + is the right approach, but if our tests show that we are getting incorrect error locations, then we can start to change +s into -s as we have done here and in this case only a single change was necessary

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