Package net.hydromatic.morel.ast

Class AstNode

java.lang.Object

net.hydromatic.morel.ast.AstNode

Direct Known Subclasses:

Ast.Aggregate, Ast.DatatypeBind, Ast.Decl, Ast.Exp, Ast.FromStep, Ast.FunBind, Ast.FunMatch, Ast.Match, Ast.OrderItem, Ast.Pat, Ast.TyCon, Ast.Type, Ast.ValBind, Core.BaseNode

public abstract class AstNode
extends Object

Abstract syntax tree node.

Field Summary

Fields

Modifier and Type	Field	Description
final Op	op
final Pos	pos

Constructor Summary

Constructors

Constructor	Description
AstNode(Pos pos, Op op)

Method Summary

Modifier and Type	Method	Description
abstract AstNode	accept(Shuttle shuttle)	Accepts a shuttle, calling the Shuttle.visit(net.hydromatic.morel.ast.Ast.Literal) method appropriate to the type of this node, and returning the result.
abstract void	accept(Visitor visitor)	Accepts a visitor, calling the Shuttle.visit(net.hydromatic.morel.ast.Ast.Literal) method appropriate to the type of this node, and returning the result.
final String	toString()	Converts this node into an ML string.
final String	unparse(AstWriter w)	Converts this node into an ML string, with a given writer.
(package private) abstract AstWriter	unparse(AstWriter w, int left, int right)

Methods inherited from class java.lang.Object

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

Field Details

pos

public final Pos pos

op

public final Op op

Constructor Details

AstNode

public AstNode(Pos pos,
 Op op)

Method Details

toString

public final String toString()

Converts this node into an ML string.

The purpose of this string is debugging. If you want to generate an expression, use unparse(net.hydromatic.morel.ast.AstWriter), which will insert parentheses as necessary for operator precedence.

Derived classes may override, but they must produce the same result; so the only reason to override is if they can do it more efficiently.

Overrides:

toString in class Object

unparse

public final String unparse(AstWriter w)

Converts this node into an ML string, with a given writer.

unparse

abstract AstWriter unparse(AstWriter w,
 int left,
 int right)

accept

public abstract AstNode accept(Shuttle shuttle)

Accepts a shuttle, calling the Shuttle.visit(net.hydromatic.morel.ast.Ast.Literal) method appropriate to the type of this node, and returning the result.

accept

public abstract void accept(Visitor visitor)

Accepts a visitor, calling the Shuttle.visit(net.hydromatic.morel.ast.Ast.Literal) method appropriate to the type of this node, and returning the result.