avrora.core.isdl.ast
Class MapExpr

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

public class MapExpr

extends Expr

The MapExpr class represents an expression that is an access of an element within a map.

Field Summary

Expr	index The index field stores a references to the expression which is evaluated to yield the index into the map.
Token	mapname The mapname field stores a reference to the name of the map whose element is being accessed.

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

MapExpr(Token s, Expr i)
The constructor of the MapExpr class initializes the publicly accessable fields that represent the members of this expression

Method Summary

Expr	accept(CodeRebuilder r) The accept() method implements one half of the visitor pattern for rebuilding of expressions.
void	accept(CodeVisitor 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.
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.
int	getPrecedence() The getPrecedence() method gets the binding precedence for this expression.
boolean	isMap() The isMap() method tests whether this expression is a reference to an element of a map.
java.lang.String	toString() The toString() method recursively converts this expression to a string.

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

getBitWidth, innerString, isBitRangeExpr, isConstantExpr, isLiteral, isVariable, tokenToBool, tokenToInt

Methods inherited from class java.lang.Object

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

Field Detail

mapname

public final Token mapname

The mapname field stores a reference to the name of the map whose element is being accessed.

index

public final Expr index

The index field stores a references to the expression which is evaluated to yield the index into the map.

Constructor Detail

MapExpr

public MapExpr(Token s,
               Expr i)

The constructor of the MapExpr class initializes the publicly accessable fields that represent the members of this expression

Parameters:

s - the string name of the map as a token

i - an expression representing the index into the map

Method Detail

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

accept

public void accept(CodeVisitor 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

accept

public Expr accept(CodeRebuilder r)

The accept() method implements one half of the visitor pattern for rebuilding of expressions. This visitor allows code to be slightly modified while only writing visit methods for the parts of the syntax tree affected.

Specified by:

accept in class Expr

Parameters:

r - the rebuilder to accept

Returns:

the result of calling the appropriate visit() method of the rebuilder

toString

public java.lang.String toString()

The toString() method recursively converts this expression to a string. For binary operations, inner expressions will be nested within parentheses if their precedence is lower than the precedence of the parent expression.

Returns:

a string representation of this expression

getPrecedence

public int getPrecedence()

The getPrecedence() method gets the binding precedence for this expression. This is used to compute when inner expressions must be nested within parentheses in order to preserve the implied order of evaluation.

Specified by:

getPrecedence in class Expr

Returns:

an integer representing the precedence of this expression; higher numbers are higher precedence

isMap

public boolean isMap()

The isMap() method tests whether this expression is a reference to an element of a map. This is used in pattern matching in some parts of the tools that work on abstract syntax trees. For instances of MapExpr, this method returns always true.

Overrides:

isMap in class Expr

Returns:

true