oops.parser
Class Opt

java.lang.Object
  |
  +--oops.parser.Node
        |
        +--oops.parser.Many
              |
              +--oops.parser.Opt

public class Opt

extends Many

represents zero or one occurrence: [ alt ].

See Also:

Serialized Form

Fields inherited from class oops.parser.Many

node

Fields inherited from class oops.parser.Node

follow, lookahead

Constructor Summary

Opt(Node node)

Method Summary

Node	node() simplifies tree.
void	parse(Scanner scanner, Goal goal, Parser parser, oops.parser.Activation caller) performs recognition.
Set	setFollow(Parser parser, Set succ) subtree gets succ.
java.lang.String	toString()

Methods inherited from class oops.parser.Many

checkDeadLoop, checkLL1, degree, setLookahead, sub

Methods inherited from class oops.parser.Node

add, getLookahead

Methods inherited from class java.lang.Object

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

Constructor Detail

Opt

public Opt(Node node)

Method Detail

node

public Node node()

Description copied from class: Node

simplifies tree.

Overrides:

node in class Many

Tags copied from class: Node

Returns:

this, subtree, or suitable node.

setFollow

public Set setFollow(Parser parser,
                     Set succ)

subtree gets succ.

Overrides:

setFollow in class Many

Tags copied from class: Node

Parameters:

parser - Parser for token setup.

succ - lookahead of successor.

Returns:

lookahead, i.e., follow for predecessor.

toString

public java.lang.String toString()

Overrides:

toString in class Many

parse

public void parse(Scanner scanner,
                  Goal goal,
                  Parser parser,
                  oops.parser.Activation caller)
           throws java.io.IOException,
                  oops.parser.Activation

performs recognition.

Overrides:

parse in class Many

Parameters:

scanner - delivers input tokens.

goal - represents current nonterminal and is informed about shifts/reduces.

caller - Activation frame.