xtc.parser

Class PParserState

java.lang.Object

xtc.parser.PParserState

All Implemented Interfaces:

State

public class PParserState
extends java.lang.Object
implements State

Parser state for parsing Rats! grammars. Note that this class supports only a single state-modifying transaction. In other words, calls to start(), commit(), and abort() cannot be nested within each other.

Version:

$Revision: 1.5 $

Author:

Robert Grimm

Constructor Summary

Constructors

Constructor and Description
PParserState() Create a new packrat parser state object.

Method Summary

Methods

Modifier and Type	Method and Description
void	abort() Abort a state-modifying transaction.
void	close() Record a closing brace.
void	commit() Commit a state-modifying transaction.
void	content() Record any character besides spaces.
java.util.List<java.lang.Integer>	indentations() Retrieve the list of indentation levels.
void	newline() Record a newline.
void	open() Record an opening brace.
void	reset(java.lang.String file) Reset the global state object.
void	start() Start a new state-modifying transaction.

Methods inherited from class java.lang.Object

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

Constructor Detail

PParserState

public PParserState()

Create a new packrat parser state object.

Method Detail

reset

public void reset(java.lang.String file)

Description copied from interface: State

Reset the global state object. This method is called at the beginning of each method representing a production with the resetting attribute.

Specified by:

reset in interface State

Parameters:

file - The file name.

start

public void start()

Description copied from interface: State

Start a new state-modifying transaction. This method is called at the beginning of each method representing a production with the stateful attribute.

Specified by:

start in interface State

commit

public void commit()

Description copied from interface: State

Commit a state-modifying transaction. This method is called on a successful parse before returning from a method representing a production with the stateful attribute.

Specified by:

commit in interface State

abort

public void abort()

Description copied from interface: State

Abort a state-modifying transaction. This method is called on an erroneous parse before returning from a method representing a production with the stateful attribute.

Specified by:

abort in interface State

open

public void open()

Record an opening brace.

content

public void content()

Record any character besides spaces.

newline

public void newline()

Record a newline.

close

public void close()

Record a closing brace.

indentations

public java.util.List<java.lang.Integer> indentations()

Retrieve the list of indentation levels. The list contains one entry per invocation of newline() since the last invocation of start().

Returns:

The list of indentation levels.