avrora.core.isdl.ast
Class Literal

java.lang.Object
  avrora.core.isdl.ast.Expr
      avrora.core.isdl.ast.Literal

Direct Known Subclasses:

Literal.BoolExpr, Literal.IntExpr

public abstract class Literal

extends Expr

The Literal class represents a literal (constant value) as part of an expression. Literals have known, constant values, either boolean or integer.

Nested Class Summary

static class	Literal.BoolExpr The BoolExpr inner class represents a boolean literal that has a known, constant value (true or false).
static class	Literal.IntExpr The IntExpr inner class represents an integer literal that has a known, constant value.

Field Summary

Token

token The token fields stores a reference to the original token representing this literal.

Fields inherited from class avrora.core.isdl.ast.Expr

PREC_A_ADD, PREC_A_AND, PREC_A_MUL, PREC_A_OR, PREC_A_SHIFT, PREC_A_XOR, PREC_L_AND, PREC_L_EQU, PREC_L_OR, PREC_L_REL, PREC_L_XOR, PREC_TERM, PREC_UN

Constructor Summary

Literal(Token t)

Method Summary

void	accept(ExprVisitor v) The accept() method implements one half of the visitor pattern so that client visitors can traverse the syntax tree easily and in an extensible way.
boolean	isConstantExpr() The isConstantExpr() method tests whether this expression is a constant expression (i.e. it is reducable to a constant and has no references to variables, maps, etc).
boolean	isLiteral() The isLiteral() method tests whether this expression is a known constant directly (i.e. a literal).

Methods inherited from class avrora.core.isdl.ast.Expr

accept, accept, getBitWidth, getPrecedence, innerString, isBitRangeExpr, isMap, isVariable, tokenToBool, tokenToInt

Methods inherited from class java.lang.Object

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

Field Detail

token

public final Token token

The token fields stores a reference to the original token representing this literal.

Constructor Detail

Literal

public Literal(Token t)

Method Detail

isLiteral

public boolean isLiteral()

Description copied from class: Expr

The isLiteral() method tests whether this expression is a known constant directly (i.e. a literal).

Overrides:

isLiteral in class Expr

Returns:

true if this expression is a literal; false otherwise

isConstantExpr

public boolean isConstantExpr()

The isConstantExpr() method tests whether this expression is a constant expression (i.e. it is reducable to a constant and has no references to variables, maps, etc). For literals, this method will always return true because a literal is a constant value.

Overrides:

isConstantExpr in class Expr

Returns:

true if this expression can be evaluated to a constant; false otherwise

accept

public void accept(ExprVisitor v)

The accept() method implements one half of the visitor pattern so that client visitors can traverse the syntax tree easily and in an extensible way.

Specified by:

accept in class Expr

Parameters:

v - the visitor to accept