openjava.syntax
Class AbstractSyntaxRule

java.lang.Object
  |
  +--openjava.syntax.AbstractSyntaxRule

All Implemented Interfaces:

SyntaxRule, TokenID

Direct Known Subclasses:

BlockRule, CompositeRule, ExpressionRule, IdentifierRule, IterationRule, NameRule, PrepPhraseRule, SelectionRule, SeparatedListRule, StatementRule, TokenRule, TypeNameRule

public abstract class AbstractSyntaxRule

extends Object

implements SyntaxRule

The interface AbstractSyntaxRule represents a syntax rule.

Since:

%SOFTWARE% 1.0

Version:

1.0

Author:

Michiaki Tatsubori

See Also:

Object

Field Summary

private SyntaxException

lastException

Fields inherited from interface openjava.syntax.TokenID

ABSTRACT, ANDASSIGN, ASSIGN, BANG, BIT_AND, BIT_OR, BOOLEAN, BREAK, BYTE, CASE, CATCH, CHAR, CHARACTER_LITERAL, CLASS, COLON, COMMA, CONDITIONAL_AND, CONDITIONAL_OR, CONTINUE, DECREMENT, DEFAULT, DO, DOT, DOUBLE, DOUBLE_LITERAL, ELSE, EOF, EQUAL, EXTENDS, FALSE, FINAL, FINALLY, FLOAT, FLOAT_LITERAL, FOR, GREATER, GREATER_EQUAL, HOOK, IDENTIFIER, IF, IMPLEMENTS, IMPORT, INCREMENT, INSTANCEOF, INSTANTIATES, INT, INTEGER_LITERAL, INTERFACE, LBRACE, LBRACKET, LESS, LESS_EQUAL, LONG, LONG_LITERAL, LPAREN, LSHIFT, LSHIFTASSIGN, METACLASS, MINUS, MINUSASSIGN, NATIVE, NEW, NOT_EQUAL, NULL, ORASSIGN, PACKAGE, PLUS, PLUSASSIGN, PRIVATE, PROTECTED, PUBLIC, RBRACE, RBRACKET, REM, REMASSIGN, RETURN, RPAREN, RSIGNEDSHIFT, RSIGNEDSHIFTASSIGN, RUNSIGNEDSHIFT, RUNSIGNEDSHIFTASSIGN, SEMICOLON, SHORT, SLASH, SLASHASSIGN, STAR, STARASSIGN, STATIC, STRING_LITERAL, SUPER, SWITCH, SYNCHRONIZED, THIS, THROW, THROWS, TILDE, TRANSIENT, TRUE, TRY, VOID, VOLATILE, WHILE, XOR, XORASSIGN

Constructor Summary

AbstractSyntaxRule()

Method Summary

abstract ParseTree	consume(TokenSource token_src) Consumes tokens from the given token source following the rule.
SyntaxException	getSyntaxException() Obtains the syntax exception at the last lookahead.
boolean	lookahead(TokenSource token_src) Tests if the given token source follows this rule.
private void	setSyntaxException(SyntaxException e) Sets the last syntax exception in consuming token source through the method consume(TokenSource).

Methods inherited from class java.lang.Object

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

Field Detail

lastException

private SyntaxException lastException

Constructor Detail

AbstractSyntaxRule

public AbstractSyntaxRule()

Method Detail

consume

public abstract ParseTree consume(TokenSource token_src)
                           throws SyntaxException

Consumes tokens from the given token source following the rule. To be overridden.

Specified by:

consume in interface SyntaxRule

Parameters:

token_src - token source to consume.

Returns:

a parse tree object consumed by following this rule.

Throws:

SyntaxException - in case to fail to consume.

lookahead

public final boolean lookahead(TokenSource token_src)

Tests if the given token source follows this rule.

Specified by:

lookahead in interface SyntaxRule

Parameters:

token_src - token source to consume.

Returns:

true if the given token source can be consumed safely.

getSyntaxException

public final SyntaxException getSyntaxException()

Obtains the syntax exception at the last lookahead. through the method lookahead(TokenSource).

Specified by:

getSyntaxException in interface SyntaxRule

Returns:

the syntax exception.

setSyntaxException

private final void setSyntaxException(SyntaxException e)

Sets the last syntax exception in consuming token source through the method consume(TokenSource).

Returns:

the syntax exception.