io.parsingdata.metal.token

Class Def

java.lang.Object

io.parsingdata.metal.token.Token

io.parsingdata.metal.token.Def

public class Def
extends Token

A Token that specifies a value to parse in the input.

A Def consists of a size (a ValueExpression, in bytes) and a predicate (an Expression). The predicate may be null.

Parsing will succeed if size evaluates to a single value, if that many bytes are available in the input and if predicate (if present) evaluates to true.

See Also:

Expression, Nod, ValueExpression

Field Summary

Fields

Modifier and Type	Field and Description
Expression	predicate
ValueExpression	size

Fields inherited from class io.parsingdata.metal.token.Token

encoding, name, NO_NAME, SEPARATOR

Constructor Summary

Constructors

Constructor and Description
Def(String name, ValueExpression size, Expression predicate, Encoding encoding)

Method Summary

Modifier and Type	Method and Description
protected ParseResult	parseImpl(String scope, Environment environment, Encoding encoding)
String	toString()

Methods inherited from class io.parsingdata.metal.token.Token

getCanonical, isLocal, makeNameFragment, parse, parse

Methods inherited from class java.lang.Object

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

Field Detail

size

public final ValueExpression size

predicate

public final Expression predicate

Constructor Detail

Def

public Def(String name,
           ValueExpression size,
           Expression predicate,
           Encoding encoding)

Method Detail

parseImpl

protected ParseResult parseImpl(String scope,
                                Environment environment,
                                Encoding encoding)
                         throws IOException

Specified by:

parseImpl in class Token

Throws:

IOException

toString

public String toString()

Overrides:

toString in class Object