Class Parser.Lazy<T>

java.lang.Object

com.google.common.labs.parse.Parser<T>

com.google.common.labs.parse.Parser.Lazy<T>

Enclosing class:

Parser<T>

public static final class Parser.Lazy<T>
extends Parser<T>

A lazy parser, to be used for recursive grammars.

For example, to create a parser for a simple calculator that supports single-digit numbers, addition, and parentheses, you can write:

 var lazy = new Parser.Lazy<Integer>();
 Parser<Integer> num = Parser.single(CharPredicate.inRange('0', '9')).map(c -> c - '0');
 Parser<Integer> atomic = lazy.between("(", ")").or(num);
 Parser<Integer> expr =
     atomic.atLeastOnceDelimitedBy("+")
         .map(nums -> nums.stream().mapToInt(n -> n).sum());
 return lazy.delegateTo(expr);
 

Nested Class Summary

Nested classes/interfaces inherited from class com.google.common.labs.parse.Parser

Parser.Lazy<T>, Parser.OrEmpty, Parser.ParseException

Constructor Summary

Constructors

Constructor	Description
Lazy()

Method Summary

Modifier and Type	Method	Description
Parser<T>	delegateTo(Parser<T> parser)	Sets and returns the delegate parser.

Methods inherited from class com.google.common.labs.parse.Parser

anyOf, atLeastOnce, atLeastOnce, atLeastOnceDelimitedBy, atLeastOnceDelimitedBy, between, between, consecutive, expecting, flatMap, followedBy, followedBy, followedBy, literally, literally, map, notFollowedBy, notFollowedBy, optional, optionallyFollowedBy, optionallyFollowedBy, optionallyFollowedBy, or, or, orElse, parse, parseSkipping, parseSkipping, parseToStream, parseToStreamSkipping, parseToStreamSkipping, postfix, prefix, sequence, sequence, sequence, single, string, then, then, thenReturn, zeroOrMore, zeroOrMore, zeroOrMore, zeroOrMoreDelimitedBy, zeroOrMoreDelimitedBy

Methods inherited from class java.lang.Object

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

Constructor Details

Lazy

public Lazy()

Method Details

delegateTo

public Parser<T> delegateTo(Parser<T> parser)

Sets and returns the delegate parser.