Package org.jparsec

Class Lexicon

java.lang.Object

org.jparsec.Lexicon

Direct Known Subclasses:

Terminals

class Lexicon
extends Object

A Lexicon is a group of lexical words that can be tokenized by a single tokenizer.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) final Parser<?>	tokenizer	The scanner that recognizes any of the lexical word.
(package private) final Function<String,Object>	words	Maps lexical word name to token value.

Constructor Summary

Constructors

Constructor	Description
Lexicon(Function<String,Object> words, Parser<?> tokenizer)

Method Summary

Modifier and Type	Method	Description
(package private) static <F, T> Function<F,T>	fallback(Function<F,T> function, Function<? super F,? extends T> defaultFunction)	Returns a Function that delegates to function and falls back to defaultFunction for null return values.
Parser<?>	phrase(String... tokenNames)	A Parser that recognizes a sequence of tokens identified by tokenNames, as an atomic step.
Parser<Token>	token(String tokenName)	A Parser that recognizes the token identified by tokenName.
Parser<Token>	token(String... tokenNames)	A Parser that recognizes a token identified by any of tokenNames.
Parser<?>	tokenizer()	Returns the tokenizer that tokenizes all terminals (operators, keywords, identifiers etc.) managed in this instance.
(package private) Lexicon	union(Lexicon that)	Returns a Lexicon instance that's a union of this and that.
(package private) Object	word(String name)	Gets the token value identified by the token text.

Methods inherited from class java.lang.Object

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

Field Details

words

final Function<String,Object> words

Maps lexical word name to token value.

tokenizer

final Parser<?> tokenizer

The scanner that recognizes any of the lexical word.

Constructor Details

Lexicon

Lexicon(Function<String,Object> words,
 Parser<?> tokenizer)

Method Details

tokenizer

public Parser<?> tokenizer()

Returns the tokenizer that tokenizes all terminals (operators, keywords, identifiers etc.) managed in this instance.

phrase

public Parser<?> phrase(String... tokenNames)

A Parser that recognizes a sequence of tokens identified by tokenNames, as an atomic step.

token

public Parser<Token> token(String... tokenNames)

A Parser that recognizes a token identified by any of tokenNames.

token

public Parser<Token> token(String tokenName)

A Parser that recognizes the token identified by tokenName.

word

Object word(String name)

Gets the token value identified by the token text. This text is the operator or the keyword.

Parameters:

name - the token text.

Returns:

the token object.

Throws:

IllegalArgumentException - if the token object does not exist.

union

Lexicon union(Lexicon that)

Returns a Lexicon instance that's a union of this and that.

fallback

static <F,
T> Function<F,T> fallback(Function<F,T> function,
 Function<? super F,? extends T> defaultFunction)

Returns a Function that delegates to function and falls back to defaultFunction for null return values.