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This is a good principle to follow because it allows the behavior or implementation details of a translator to be changed without having to actually go inside a possibly dark and scary grammar. Trigger functions are defined easily by adding some virtual functions to the class definition: class PolyParser { << protected: virtual void store(char *reg, float v) {;} virtual float value(char *reg) {;} >> ... } where we have defined only the two most basic operations needed by our parser. z to store and retrieve the register values.

Suffixes return subtrees whose roots are made children of the current subtree root. For example, the tree returned from poly is made a child of the assignment node with the target of the assignment as the other child. The call to preorder() for the return tree, #0, in assign walks the tree and prints it out in LISP form. For the moment, we print out the tree rather than invoke a SORCERER tree walker so that this portion of the evaluator can be tested separately. To collect the sum of terms is easy to do: poly : ; term ( "\+"^ term )* The ^ suffix on the "\+" tells ANTLR to create an addition node and place it as the root of whatever subtree has been constructed up until that point for rule poly.

Is differentiated by manipulating the associated AST and printing the polynomial back out. /poly 2x^5 + x^2 + 3x + 9 10x^4+2x+3 where again the bold characters represent the input string. Language Recognition and Syntax-Directed Interpretation We break up building our polynomial evaluator into three main tasks: 1. Describing the syntax 2. Describing the vocabulary (set of input symbols or tokens) 3. Inserting semantic actions to evaluate the polynomial Tasks 1 and 2 result in a working polynomial recognizer and task 3 results in a working evaluator.

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