jminusminus

Class Parser

java.lang.Object

jminusminus.Parser

public class Parser
extends Object

A recursive descent parser that, given a lexical analyzer (a LookaheadScanner), parses a Java compilation unit (program file), taking tokens from the LookaheadScanner, and produces an abstract syntax tree (AST) for it.

Constructor Summary

Constructors

Constructor and Description
Parser(LookaheadScanner scanner) Construct a parser from the given lexical analyzer.

Method Summary

Methods

Modifier and Type	Method and Description
JCompilationUnit	compilationUnit() Parse a compilation unit (a program file) and construct an AST for it.
boolean	errorHasOccurred() Has a parser error occurred up to now?

Methods inherited from class java.lang.Object

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

Constructor Detail

Parser

public Parser(LookaheadScanner scanner)

Construct a parser from the given lexical analyzer.

Parameters:

scanner - the lexical analyzer with which tokens are scanned.

Method Detail

errorHasOccurred

public boolean errorHasOccurred()

Has a parser error occurred up to now?

Returns:

true or false.

compilationUnit

public JCompilationUnit compilationUnit()

Parse a compilation unit (a program file) and construct an AST for it. After constructing the Parser, this is its entry point.

   compilationUnit ::= [PACKAGE qualifiedIdentifier SEMI]
                       {IMPORT  qualifiedIdentifier SEMI}
                       {typeDeclaration}
                       EOF
 

Returns:

an AST for a compilationUnit.