Package net.hydromatic.morel.ast

Class Ast.From

java.lang.Object

net.hydromatic.morel.ast.AstNode

net.hydromatic.morel.ast.Ast.Exp

net.hydromatic.morel.ast.Ast.From

Enclosing class:

Ast

public static class Ast.From
extends Ast.Exp

From expression.

Field Summary

Fields

Modifier and Type	Field	Description
@Nullable Ast.Exp	implicitYieldExp	An implicit yield expression, if the last step is not a Ast.Yield; null if the last step is a Ast.Yield.
com.google.common.collect.ImmutableList<Ast.FromStep>	steps

Fields inherited from class net.hydromatic.morel.ast.AstNode

op, pos

Constructor Summary

Constructors

Constructor	Description
From(Pos pos, com.google.common.collect.ImmutableList<Ast.FromStep> steps, @Nullable Ast.Exp implicitYieldExp)

Method Summary

Modifier and Type	Method	Description
Ast.Exp	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.
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.
Ast.From	copy(List<Ast.FromStep> steps, @Nullable Ast.Exp implicitYieldExp)	Creates a copy of this From with given contents, or this if the contents are the same.
(package private) static @Nullable Ast.Exp	implicitYieldExp(Pos pos, List<Ast.FromStep> steps)
boolean	isCompute()	Returns whether this from expression ends with a compute step.
(package private) AstWriter	unparse(AstWriter w, int left, int right)

Methods inherited from class net.hydromatic.morel.ast.Ast.Exp

args, forEachArg

Methods inherited from class net.hydromatic.morel.ast.AstNode

toString, unparse

Methods inherited from class java.lang.Object

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

Field Detail

steps

public final com.google.common.collect.ImmutableList<Ast.FromStep> steps

implicitYieldExp

public final @Nullable Ast.Exp implicitYieldExp

An implicit yield expression, if the last step is not a Ast.Yield; null if the last step is a Ast.Yield.

Constructor Detail

From

From(Pos pos,
     com.google.common.collect.ImmutableList<Ast.FromStep> steps,
     @Nullable Ast.Exp implicitYieldExp)

Method Detail

implicitYieldExp

static @Nullable Ast.Exp implicitYieldExp(Pos pos,
                                          List<Ast.FromStep> steps)

accept

public Ast.Exp accept(Shuttle shuttle)

Description copied from class: AstNode

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.

Specified by:

accept in class Ast.Exp

accept

public void accept(Visitor visitor)

Description copied from class: AstNode

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.

Specified by:

accept in class AstNode

unparse

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

Specified by:

unparse in class AstNode

copy

public Ast.From copy(List<Ast.FromStep> steps,
                     @Nullable Ast.Exp implicitYieldExp)

Creates a copy of this From with given contents, or this if the contents are the same.

isCompute

public boolean isCompute()

Returns whether this from expression ends with a compute step. If so, it is a monoid comprehension, not a monad comprehension, and its type is a scalar value (or record), not a list.