org.stekikun.dolmen.tagged

Class Encoder

java.lang.Object

org.stekikun.dolmen.tagged.Encoder

public final class Encoder
extends Object

An instance of Encoder can be used to encode syntactic regular expressions in tagged regular expressions.

All regular expressions encoded within the same instance share a common pool of character sets, which can be retrieved via getCharacterSets().

Author:

Stéphane Lescuyer

Constructor Summary

Constructors

Constructor and Description
Encoder(boolean optimisation)

Method Summary

Modifier and Type	Method and Description
TRegular	encode(Regular regular, Set<String> charVars, int action)
static TLexer	encodeLexer(Lexer lexer, boolean optimisation)
List<CSet>	getCharacterSets()

Methods inherited from class java.lang.Object

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

Constructor Detail

Encoder

public Encoder(boolean optimisation)

Parameters:

optimisation - whether optimisation should be applied Returns a freshly initialized encoder

Method Detail

getCharacterSets

public List<CSet> getCharacterSets()

Returns:

an unmodifiable view of the character sets recorded by this encoder, suitable for interpreting character set indices in tagged regular expressions encoded by this

encode

public TRegular encode(Regular regular,
                       Set<String> charVars,
                       int action)

Parameters:

regular - the regular expression to encode

charVars - bound variables guaranteed to be matching single characters

action - the semantic action associated to this regular expression

Returns:

a tagged regular expression corresponding to the given regular expression regular. Character sets in the resulting expression are encoded in this encoder

See Also:

getCharacterSets()

encodeLexer

public static TLexer encodeLexer(Lexer lexer,
                                 boolean optimisation)

Parameters:

optimisation - whether optimisation should be applied

lexer -

Returns:

a tagged lexer definition from lexer

See Also:

TLexer