The parser is the software that takes those meaningful words and builds a parse tree out of them by recognizing their type and purpose.
It also serves as an example of my earlier contention that using parse trees makes debugging easier and consequently speeds development time.
The first approach is to delay all semantic actions until the whole parse tree is constructed.
From the discussion in the last column, you may recall that the algorithm to construct a DFA expects a parse tree as input.
The syntax-aware reflow we use to wrap long lines is based on the parse trees (abstract syntax trees) for the language, and some other things need per-language customization.
The DFA construction algorithm converts this parse tree into a set of states, as the previous column explains.
Treetop generates parse trees automatically but allows the user to customize the generated nodes by adding methods
I'll note before we go any further that the terms parse tree and abstract syntax tree (or AST) describe very similar grammatical structures.
Your application could do more interesting things with the parse tree.
A 32-bit sparse tree adder with modified carry tree structure is proposed.
Write client-side code to walk and evaluate the parse tree that's produced at runtime.
The single quotation mark in front of the null list is used to tell Scheme that you are using as data and not as a part of your parse tree.
The most important ones for HC are RootDoc, ClassDoc, and MethodDoc; they return information on the parse tree, classes, and methods, respectively.
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