org.checkerframework.javacutil.trees

Class TreeParser

java.lang.Object

org.checkerframework.javacutil.trees.TreeParser

public class TreeParser
extends Object

A Utility class for parsing Java expression snippets, and converting them to proper Javac AST nodes.

This is useful for parsing EnsuresNonNull*, and KeyFor values.

Currently, it handles four tree types only:

• Identifier tree (e.g. id)
• Literal tree (e.g. 2, 3)
• Method invocation tree (e.g. method(2, 3))
• Member select tree (e.g. Class.field, instance.method())
• Array access tree (e.g. array[id])

Notable limitation: Doesn't handle spaces, or non-method-argument parenthesis.

It's implemented via a Recursive-Descend parser.

Constructor Summary

Constructors

Constructor and Description
TreeParser(ProcessingEnvironment env) Create a TreeParser.

Method Summary

Modifier and Type	Method and Description
ExpressionTree	parseTree(String s) Parses the snippet in the string as an internal Javac AST expression node.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TreeParser

public TreeParser(ProcessingEnvironment env)

Create a TreeParser.

Method Detail

parseTree

public ExpressionTree parseTree(String s)

Parses the snippet in the string as an internal Javac AST expression node.

Parameters:

s - the java snippet

Returns:

the AST corresponding to the snippet