eu.cqse.check.framework.shallowparser.languages.cobol

Class BoundedByOppositeClausesRecognizer

java.lang.Object

eu.cqse.check.framework.shallowparser.framework.RecognizerBase<ECobolParserState>

eu.cqse.check.framework.shallowparser.languages.cobol.BoundedByOppositeClausesRecognizer

public class BoundedByOppositeClausesRecognizer
extends RecognizerBase<ECobolParserState>

This recognizer matches if the currently parsed verb is surrounded by different conditional clauses. Given a COBOL statement that should continue with a conditional clause. When parsing enters the clause, we might encounter another nested COBOL verb that also has that clause. For instance the CALL and DISPLAY verbs both have the (NOT) ON EXCEPTION clause. When both verbs occur in a statement like CALL a ON EXCEPTION DISPLAY b NOT ON EXCEPTION DISPLAY c, the parser needs to know which verb has which clause when it gets to the NOT term. For this example the NOT ON EXCEPTION belongs to the CALL verb. If there was not a NOT in the second clause, it would belong to the DISPLAY verb because by syntax verbs cannot usually have more than one occurrence of a clause in a statement.

Field Summary

Fields inherited from class eu.cqse.check.framework.shallowparser.framework.RecognizerBase

NO_MATCH, tailRecognizers

Constructor Summary

Constructors

Constructor and Description
BoundedByOppositeClausesRecognizer()

Method Summary

Modifier and Type	Method and Description
protected int	matchesLocally(ParserState<ECobolParserState> parserState, java.util.List<IToken> tokens, int startOffset) Attempts to match the recognizer locally (without respecting tail recognizers).

Methods inherited from class eu.cqse.check.framework.shallowparser.framework.RecognizerBase

createNode, createNode, createNode, debug, endNode, endNodeWithContinuation, endNodeWithContinuation, endNodeWithName, ensureTopLevel, getRecognizerStringRepresentation, markStart, matches, notPreCondition, optional, optionalSubRecognizer, parseOnce, parseStrictlyUntil, parseUntil, parseUntilOrEof, preCondition, repeated, repeatedAtLeastOnce, repeatedSubRecognizer, sequence, sequenceBefore, skipAny, skipBefore, skipBeforeWithNesting, skipBeforeWithNesting, skipBeforeWithNesting, skipBeforeWithNesting, skipBeforeWithNesting, skipBeforeWithNesting, skipForward, skipNested, skipNested, skipTo, skipToWithNesting, skipToWithNesting, skipToWithNesting, skipToWithNesting, skipWithNesting, skipWithNesting, subRecognizer, subRecognizer, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

BoundedByOppositeClausesRecognizer

public BoundedByOppositeClausesRecognizer()

Method Detail

matchesLocally

protected int matchesLocally(ParserState<ECobolParserState> parserState,
                             java.util.List<IToken> tokens,
                             int startOffset)

Attempts to match the recognizer locally (without respecting tail recognizers).

Overrides:

matchesLocally in class RecognizerBase<ECobolParserState>

Parameters:

parserState - the current state of the underlying parser.

tokens - the list of tokens.

startOffset - the current offset into the tokens from where to start matching.

Returns:

the new offset (position right behind the match) or RecognizerBase.NO_MATCH if matching was not possible at this position.