io.parsingdata.metal.expression.value

Class FoldLeft

java.lang.Object

io.parsingdata.metal.expression.value.Fold

io.parsingdata.metal.expression.value.FoldLeft

All Implemented Interfaces:

ValueExpression

public class FoldLeft
extends Fold

A ValueExpression implementation of the FoldLeft operation.

FoldLeft differs from FoldRight in that the reduce operation is applied from left to right (i.e., starting at the top).

See Also:

FoldRight

Field Summary

Fields inherited from class io.parsingdata.metal.expression.value.Fold

initial, reducer, values

Constructor Summary

Constructors

Constructor and Description
FoldLeft(ValueExpression values, Reducer reducer, ValueExpression initial)

Method Summary

Modifier and Type	Method and Description
protected ImmutableList<OptionalValue>	prepareValues(ImmutableList<OptionalValue> values)
protected ValueExpression	reduce(Reducer reducer, Value head, Value tail)

Methods inherited from class io.parsingdata.metal.expression.value.Fold

eval

Methods inherited from class java.lang.Object

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

Constructor Detail

FoldLeft

public FoldLeft(ValueExpression values,
                Reducer reducer,
                ValueExpression initial)

Method Detail

prepareValues

protected ImmutableList<OptionalValue> prepareValues(ImmutableList<OptionalValue> values)

Specified by:

prepareValues in class Fold

reduce

protected ValueExpression reduce(Reducer reducer,
                                 Value head,
                                 Value tail)

Specified by:

reduce in class Fold