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.FunBind, Ast.FunMatch, Ast.Match, Ast.Pat, Ast.TyCon, Ast.Type, Ast.ValBind

public abstract class AstNode
extends java.lang.Object

Abstract syntax tree node.

Field Summary

Fields

Modifier and Type	Field	Description
Op	op
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.
java.lang.String	toString()	Converts this node into an ML string.
(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 Detail

pos

public final Pos pos

op

public final Op op

Constructor Detail

AstNode

public AstNode(Pos pos,
               Op op)

Method Detail

toString

public final java.lang.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, int, int), 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 java.lang.Object

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.