gololang.ir

Class MatchExpression

java.lang.Object

gololang.ir.GoloElement<T>

gololang.ir.GoloStatement<T>

gololang.ir.ExpressionStatement<MatchExpression>

gololang.ir.MatchExpression

All Implemented Interfaces:

Alternatives<ExpressionStatement<?>>

public final class MatchExpression
extends ExpressionStatement<MatchExpression>
implements Alternatives<ExpressionStatement<?>>

A match node.

This node describe tree such as:

  match {
    when condition_1 then expression_1
    when condition_2 then expression_2
    otherwise default_expression
  }
 

Method Summary

Modifier and Type	Method and Description
void	accept(GoloIrVisitor visitor) Accept the visitor.
java.util.List<GoloElement<?>>	children() Returns a list of all the direct children of this node.
java.util.List<WhenClause<ExpressionStatement<?>>>	getClauses()
ExpressionStatement<?>	getOtherwise()
static MatchExpression	match() Creates an empty match expression.
MatchExpression	otherwise(java.lang.Object action) Defines the default alternative clause.
protected void	replaceElement(GoloElement<?> original, GoloElement<?> newElement) Replace a child.
protected MatchExpression	self()
MatchExpression	then(java.lang.Object action) Defines the action of the previous clause.
MatchExpression	when(java.lang.Object cond) Defines a new alternative clause.

Methods inherited from class gololang.ir.ExpressionStatement

call, clearDeclarations, declarations, hasLocalDeclarations, of, with

Methods inherited from class gololang.ir.GoloElement

ancestor, ancestor, ancestorOfType, cantConvert, cantReplace, cantReplace, children, children, descendants, descendants, descendants, documentation, documentation, doesNotContain, enclosingModule, getLocalReferenceTable, hasParent, hasPosition, makeParentOf, metadata, metadata, next, next, next, ofAST, parent, positionInSourceCode, positionInSourceCode, previous, previous, previous, replaceInParentBy, walk

Methods inherited from class java.lang.Object

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

Method Detail

match

public static MatchExpression match()

Creates an empty match expression.

self

protected MatchExpression self()

Specified by:

self in class GoloElement<MatchExpression>

when

public MatchExpression when(java.lang.Object cond)

Defines a new alternative clause.

This is a builder method.

Specified by:

when in interface Alternatives<ExpressionStatement<?>>

Parameters:

cond - an expression node defining the clause.

then

public MatchExpression then(java.lang.Object action)

Defines the action of the previous clause.

This is a builder method.

It must be called after a call to when. For instance

  alternative.when(condition).then(action);
 

Specified by:

then in interface Alternatives<ExpressionStatement<?>>

Parameters:

action - a ExpressionStatement containing the expression to return.

otherwise

public MatchExpression otherwise(java.lang.Object action)

Defines the default alternative clause.

This is a builder method.

Specified by:

otherwise in interface Alternatives<ExpressionStatement<?>>

Parameters:

action - a ExpressionStatement containing the expression to return.

getClauses

public java.util.List<WhenClause<ExpressionStatement<?>>> getClauses()

Specified by:

getClauses in interface Alternatives<ExpressionStatement<?>>

getOtherwise

public ExpressionStatement<?> getOtherwise()

Specified by:

getOtherwise in interface Alternatives<ExpressionStatement<?>>

accept

public void accept(GoloIrVisitor visitor)

Accept the visitor.

This method should only call the visitor visitXXXX method. The children of this node will be visited by the GoloElement.walk(GoloIrVisitor) method.

Specified by:

accept in class GoloElement<MatchExpression>

children

public java.util.List<GoloElement<?>> children()

Returns a list of all the direct children of this node.

Overrides:

children in class GoloElement<MatchExpression>

replaceElement

protected void replaceElement(GoloElement<?> original,
                              GoloElement<?> newElement)

Replace a child.

Replace original with newElement if original is a child of this node and type matches.

Specified by:

replaceElement in class GoloElement<MatchExpression>

Parameters:

original - the original value to replace. Must be a child of this node

newElement - the element to replace with. Type must match.

See Also:

GoloElement.cantReplace(), GoloElement.cantReplace(GoloElement, GoloElement), GoloElement.doesNotContain(GoloElement), GoloElement.cantConvert(String, Object)