polyglot.ast

Class Conditional_c

java.lang.Object

polyglot.ast.Node_c

polyglot.ast.Term_c

polyglot.ast.Expr_c

polyglot.ast.Conditional_c

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, Conditional, Expr, ExprOps, Node, NodeOps, Prefix, Receiver, Term, TermOps, Typed, Copy<Node>

public class Conditional_c
extends Expr_c
implements Conditional

A Conditional is a representation of a Java ternary expression. That is, (cond ? consequent : alternative).

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface polyglot.util.Copy

Copy.Util

Nested classes/interfaces inherited from interface polyglot.ast.Term

Term.Instance

Field Summary

Fields

Modifier and Type	Field and Description
protected Expr	alternative
protected Expr	cond
protected Expr	consequent

Fields inherited from class polyglot.ast.Expr_c

type

Fields inherited from class polyglot.ast.Term_c

exceptions, reachable

Fields inherited from class polyglot.ast.Node_c

del, error, ext, position

Fields inherited from interface polyglot.ast.Term

ENTRY, EXIT

Constructor Summary

Constructors

Constructor and Description
Conditional_c(Position pos, Expr cond, Expr consequent, Expr alternative)
Conditional_c(Position pos, Expr cond, Expr consequent, Expr alternative, Ext ext)

Method Summary

Methods

Modifier and Type	Method and Description
<T> java.util.List<T>	acceptCFG(CFGBuilder<?> v, java.util.List<T> succs) Visit this term in evaluation order, calling v.edge() for each successor in succs, if data flows on that edge.
Expr	alternative() Get the expression to evaluate when the condition is false.
Conditional	alternative(Expr alternative) Set the expression to evaluate when the condition is false.
protected <N extends Conditional_c> N	alternative(N n, Expr alternative)
Type	childExpectedType(Expr child, AscriptionVisitor av) Get the expected type of a child expression of this.
Expr	cond() Get the condition to test.
Conditional	cond(Expr cond) Set the condition to test.
protected <N extends Conditional_c> N	cond(N n, Expr cond)
Expr	consequent() Get the expression to evaluate when the condition is true.
Conditional	consequent(Expr consequent) Set the expression to evaluate when the condition is true.
protected <N extends Conditional_c> N	consequent(N n, Expr consequent)
java.lang.Object	constantValue(Lang lang) Return the constant value of the expression, if any.
Node	copy(NodeFactory nf) Produce a copy of this node using the given NodeFactory.
Term	firstChild() Return the first direct subterm performed when evaluating this term.
boolean	isConstant(Lang lang) Return whether the expression evaluates to a constant.
Precedence	precedence() Get the precedence of the expression.
void	prettyPrint(CodeWriter w, PrettyPrinter tr) Pretty-print the AST using the given CodeWriter.
protected <N extends Conditional_c> N	reconstruct(N n, Expr cond, Expr consequent, Expr alternative) Reconstruct the expression.
java.lang.String	toString()
Node	typeCheck(TypeChecker tc) Type check the AST.
Node	visitChildren(NodeVisitor v) Visit the children of the node.

Methods inherited from class polyglot.ast.Expr_c

booleanValue, buildTypes, byteValue, charValue, constantValue, constantValueSet, constantValueSet, doubleValue, dump, extRewrite, floatValue, intValue, isConstant, isTypeChecked, lastLang, longValue, printSubExpr, printSubExpr, shortValue, stringValue, type, type, type

Methods inherited from class polyglot.ast.Term_c

exceptionCheck, exceptions, exceptions, exceptions, listChild, reachable, reachable, reachable

Methods inherited from class polyglot.ast.Node_c

addDecls, buildTypesEnter, checkConstants, copy, copy, copyIfNeeded, del, del, disambiguate, disambiguateEnter, disambiguateOverride, dump, dump, dump, dump, enterChildScope, enterScope, error, error, error, exceptionCheckEnter, ext, ext, ext, ext, extRewriteEnter, isDisambiguated, lang, position, position, position, prettyPrint, prettyPrint, prettyPrint, prettyPrint, print, printBlock, printSubStmt, throwTypes, translate, typeCheckEnter, typeCheckOverride, visit, visitChild, visitEdge, visitList

Methods inherited from class java.lang.Object

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

Methods inherited from interface polyglot.ast.Expr

constantValue, constantValueSet, isConstant, printSubExpr, printSubExpr, type

Methods inherited from interface polyglot.ast.Node

del, del, dump, error, error, ext, ext, ext, ext, isDisambiguated, isTypeChecked, position, position, visit, visitEdge

Methods inherited from interface polyglot.ast.NodeOps

addDecls, buildTypes, buildTypesEnter, checkConstants, copy, disambiguate, disambiguateEnter, disambiguateOverride, dump, dump, dump, dump, enterChildScope, enterScope, exceptionCheck, exceptionCheckEnter, extRewrite, extRewriteEnter, lang, prettyPrint, prettyPrint, prettyPrint, prettyPrint, throwTypes, translate, typeCheckEnter, typeCheckOverride, visitChild, visitList

Methods inherited from interface polyglot.util.Copy

copy

Methods inherited from interface polyglot.ast.Typed

type

Methods inherited from interface polyglot.ast.Term

exceptions, exceptions, reachable, reachable

Field Detail

cond

protected Expr cond

consequent

protected Expr consequent

alternative

protected Expr alternative

Constructor Detail

Conditional_c

public Conditional_c(Position pos,
             Expr cond,
             Expr consequent,
             Expr alternative)

Conditional_c

public Conditional_c(Position pos,
             Expr cond,
             Expr consequent,
             Expr alternative,
             Ext ext)

Method Detail

precedence

public Precedence precedence()

Description copied from interface: Expr

Get the precedence of the expression.

Specified by:

precedence in interface Expr

Overrides:

precedence in class Expr_c

cond

public Expr cond()

Description copied from interface: Conditional

Get the condition to test.

Specified by:

cond in interface Conditional

cond

public Conditional cond(Expr cond)

Description copied from interface: Conditional

Set the condition to test.

Specified by:

cond in interface Conditional

cond

protected <N extends Conditional_c> N cond(N n,
                               Expr cond)

consequent

public Expr consequent()

Description copied from interface: Conditional

Get the expression to evaluate when the condition is true.

Specified by:

consequent in interface Conditional

consequent

public Conditional consequent(Expr consequent)

Description copied from interface: Conditional

Set the expression to evaluate when the condition is true.

Specified by:

consequent in interface Conditional

consequent

protected <N extends Conditional_c> N consequent(N n,
                                     Expr consequent)

alternative

public Expr alternative()

Description copied from interface: Conditional

Get the expression to evaluate when the condition is false.

Specified by:

alternative in interface Conditional

alternative

public Conditional alternative(Expr alternative)

Description copied from interface: Conditional

Set the expression to evaluate when the condition is false.

Specified by:

alternative in interface Conditional

alternative

protected <N extends Conditional_c> N alternative(N n,
                                      Expr alternative)

reconstruct

protected <N extends Conditional_c> N reconstruct(N n,
                                      Expr cond,
                                      Expr consequent,
                                      Expr alternative)

Reconstruct the expression.

visitChildren

public Node visitChildren(NodeVisitor v)

Description copied from interface: NodeOps

Visit the children of the node.

Specified by:

visitChildren in interface NodeOps

Overrides:

visitChildren in class Node_c

Parameters:

v - The visitor that will traverse/rewrite the AST.

Returns:

A new AST if a change was made, or this.

typeCheck

public Node typeCheck(TypeChecker tc)
               throws SemanticException

Description copied from interface: NodeOps

Type check the AST. This method is called by the leave() method of the visitor. The method should perform work that should be done after visiting the children of the node. The method may return this or a new copy of the node which will be installed as a child of the node's parent.

Specified by:

typeCheck in interface NodeOps

Overrides:

typeCheck in class Node_c

Parameters:

tc - The type checking visitor.

Throws:

SemanticException

childExpectedType

public Type childExpectedType(Expr child,
                     AscriptionVisitor av)

Description copied from interface: NodeOps

Get the expected type of a child expression of this. The expected type is determined by the context in that the child occurs (e.g., for x = e, the expected type of e is the declared type of x. The expected type should impose the least constraints on the child's type that are allowed by the parent node.

Specified by:

childExpectedType in interface NodeOps

Overrides:

childExpectedType in class Node_c

Parameters:

child - A child expression of this node.

av - An ascription visitor.

Returns:

The expected type of child.

toString

public java.lang.String toString()

Overrides:

toString in class Node_c

prettyPrint

public void prettyPrint(CodeWriter w,
               PrettyPrinter tr)

Description copied from class: Node_c

Pretty-print the AST using the given CodeWriter.

Specified by:

prettyPrint in interface NodeOps

Overrides:

prettyPrint in class Node_c

Parameters:

w - The code writer to which to write.

tr - The pretty printer. This is not a visitor.

firstChild

public Term firstChild()

Description copied from interface: TermOps

Return the first direct subterm performed when evaluating this term. If this term has no subterms, this should return null. This method is similar to the deprecated entry(), but it should *not* recursively drill down to the innermost subterm. The direct child visited first in this term's dataflow should be returned.

Specified by:

firstChild in interface TermOps

Specified by:

firstChild in class Term_c

acceptCFG

public <T> java.util.List<T> acceptCFG(CFGBuilder<?> v,
                              java.util.List<T> succs)

Description copied from interface: TermOps

Visit this term in evaluation order, calling v.edge() for each successor in succs, if data flows on that edge.

Specified by:

acceptCFG in interface TermOps

Specified by:

acceptCFG in class Term_c

isConstant

public boolean isConstant(Lang lang)

Description copied from interface: ExprOps

Return whether the expression evaluates to a constant. Requires that disambiguation has been done, and that constantValueSet() is true.

Specified by:

isConstant in interface ExprOps

Overrides:

isConstant in class Expr_c

constantValue

public java.lang.Object constantValue(Lang lang)

Description copied from interface: ExprOps

Return the constant value of the expression, if any. Requires that isConstant() is true.

Specified by:

constantValue in interface ExprOps

Overrides:

constantValue in class Expr_c

copy

public Node copy(NodeFactory nf)

Description copied from interface: NodeOps

Produce a copy of this node using the given NodeFactory.

Specified by:

copy in interface NodeOps

Overrides:

copy in class Node_c