Package com.yahoo.prelude.query.parser

Class WebParser

java.lang.Object

com.yahoo.prelude.query.parser.AbstractParser

com.yahoo.prelude.query.parser.AllParser

com.yahoo.prelude.query.parser.WebParser

All Implemented Interfaces:

CustomParser, Parser

public class WebParser
extends AllParser

Parser for web search queries. Language:

• +item: always include this item as-is when searching (term becomes protected)
• -item: Exclude item when searching (terms becomes protected)
• a OR b (capital or): Or search for a or b
• "a b": Phrase search for a followed by b

Author:

bratseth

Field Summary

Fields inherited from class com.yahoo.prelude.query.parser.AbstractParser

braceLevelURL, defaultIndex, environment, indexFacts, language, submodes, tokens

Constructor Summary

Constructors

Constructor	Description
WebParser(ParserEnvironment environment)

Method Summary

Modifier and Type	Method	Description
protected Item	anyItems(boolean topLevel)	A collection of one or more items.
protected Item	compositeItem()
protected Item	handleComposite(boolean topLevel)
protected com.yahoo.collections.Pair<Item,Boolean>	indexableItem(String indexPath)	Returns an item and whether it had an explicit index ('indexname:' prefix).
protected Item	parseItemsBody()
protected Item	positiveItem()
protected void	setSubmodeFromIndex(String indexName, IndexFacts.Session indexFacts)	Sets the submodes used for url parsing.
protected Item	word(String indexName, boolean quoted)	Returns a WordItem if this is a non CJK query, a WordItem or SegmentItem if this is a CJK query, null if the current item is not a word

Methods inherited from class com.yahoo.prelude.query.parser.AllParser

addAnd, addNot, addOr, combineItems, negativeItem, parseItems, simplifyUnnecessaryComposites

Methods inherited from class com.yahoo.prelude.query.parser.AbstractParser

newComposite, normalize, parse, parse, segment, setState, simplifyPhrases, tokenize

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.yahoo.prelude.query.parser.CustomParser

parse

Constructor Details

WebParser

public WebParser(ParserEnvironment environment)

Method Details

parseItemsBody

protected Item parseItemsBody()

Overrides:

parseItemsBody in class AllParser

handleComposite

protected Item handleComposite(boolean topLevel)

anyItems

protected Item anyItems(boolean topLevel)

A collection of one or more items. More items are collected in the default composite - or. If there's a explicit composite and some other terms, a rank terms combines them

positiveItem

protected Item positiveItem()

compositeItem

protected Item compositeItem()

setSubmodeFromIndex

protected void setSubmodeFromIndex(String indexName,
 IndexFacts.Session indexFacts)

Sets the submodes used for url parsing. Override this to influence when such submodes are used.

indexableItem

protected com.yahoo.collections.Pair<Item,Boolean> indexableItem(String indexPath)

Returns an item and whether it had an explicit index ('indexname:' prefix).

Parameters:

indexPath - the index name prefix this is in the context of, only non-empty if this is inside a sameElement. The path includes the index name and the trailing dot.

Returns:

an item and whether it has an explicit index, or a Pair with the first element null if none

word

protected Item word(String indexName,
 boolean quoted)

Returns a WordItem if this is a non CJK query, a WordItem or SegmentItem if this is a CJK query, null if the current item is not a word

Parameters:

quoted - whether this token is inside quotes