parse tree

The DFA construction algorithm converts this parse tree into a set of states, as the previous column explains.

Like the JDT, the CDT DOM uses a visitor pattern to interact with its parse tree.

The stap process begins with a translation of the script into a parse tree (pass 1).

Strictly speaking, what I refer to as a parse tree in the following, language theoreticians would more precisely call an AST.

InfoQ: Could you tell us the advantage of using JRuby over parse tree or any other solutions, to exploit Ruby code?

Target parsing can be reasonably fast and does not generate a memory-consuming parse tree, but all events fire for all elements in the data.

The parser is the software that takes those meaningful words and builds a parse tree out of them by recognizing their type and purpose.

The Doclet API defines many classes for storing the parse tree (note that this is the Java parse tree, not the XML one).

From the discussion in the last column, you may recall that the algorithm to construct a DFA expects a parse tree as input.

Working with a parse tree representation also makes debugging easy and speeds development time.

The algorithm essentially computes all the possible stack configurations that could lead to a given node in the parse tree.

I'll note before we go any further that the terms parse tree and abstract syntax tree (or AST) describe very similar grammatical structures.

In other words, this governs the shape and content of the parse tree that's constructed by the parser.

As data and not as a part of your parse tree.

Usually, using SimpleParse means generating a parse tree in one function call, then traversing this tree in separate code.

Your application could do more interesting things with the parse tree.

I'll explore that in more detail once you've looked at JJTree and its parse tree representations.

We also propose a BaseNP-based analyzing technique to extract syntactic information from a parse tree.

It extracts command-line arguments and processes the parse tree.

InfoQ: With the ParseTree gem, one can access the parse tree of a class or method.

To perform queries on the AST parse tree, the Java IDE uses a visitor pattern.

Given the parse tree, you apply the algorithm in Listing 3 to compute the transition function.

The alternative (not explored here) is for productions to contribute only SimpleNode nodes to the parse tree and not subclasses thereof.

In fact, the example parse tree you looked at previously is almost a valid Scheme program.

The parse tree built by the BeautifulSoup class offends my senses!

The main classes are RootDocs that contain the parse tree.

Applies parse tree to data buffers.

InfoQ: How did you make your technical choice like using parse tree for parsing and building AST Ruby?

The DFAFactory class compiles a DFA from the parse tree.

Figure 3 shows the parse tree generated by this grammar that correctly enables you to evaluate "1 2 * 3" as "1 ( 2 * 3 )" .

I'll come back to this in more detail when I talk about the JJTree tool and parse tree representations in Part 2.

The parse tree for this might look something like this

Picture of parse tree for a single integer expression

Picture of parse tree for an addition operation

Write client-side code to walk and evaluate the parse tree that's produced at runtime

A special node to mark the end of the parse tree

Figure 1: Parse tree for a single integer expression

Figure 2: Parse tree for an addition operation