HTML parser throws AssertionErrors when -enableassertions is set

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#12 opened on Apr 16, 2020 2 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 35/100

Issue type: Bug
Clarity: Needs clarification
Activity status: Stale
Tech stack: java
Domain: backend

Research direction

Read nu.validator.htmlparser.impl.Tokenizer, especially clearStrBufBeforeUse and stateLoop, then reproduce the failure through the parse call chain shown in the trace with assertions enabled. Done means the HTML parser no longer throws the reported AssertionError in that environment.

Written by the indexing model from the issue text.

Description

HTML parser throws AssertionErrors when -enableassertions is set. This makes it difficult to use the validator in test environments where assertions are often enabled.

Caused by: java.lang.AssertionError: strBufLen not reset after previous use!
	at nu.validator.htmlparser.impl.Tokenizer.clearStrBufBeforeUse(Tokenizer.java:852)
	at nu.validator.htmlparser.impl.Tokenizer.stateLoop(Tokenizer.java:1561)
	at nu.validator.htmlparser.impl.Tokenizer.tokenizeBuffer(Tokenizer.java:1341)
	at nu.validator.htmlparser.io.Driver.runStates(Driver.java:320)
	at nu.validator.htmlparser.io.Driver.tokenize(Driver.java:219)
	at nu.validator.htmlparser.sax.HtmlParser.tokenize(HtmlParser.java:488)
	at nu.validator.htmlparser.sax.HtmlParser.parse(HtmlParser.java:408)
	at nu.validator.xml.WiretapXMLReaderWrapper.parse(WiretapXMLReaderWrapper.java:158)
	at nu.validator.validation.SimpleDocumentValidator.checkAsHTML(SimpleDocumentValidator.java:523)
	at nu.validator.validation.SimpleDocumentValidator.checkHtmlInputSource(SimpleDocumentValidator.java:405)

Dominant language: Java
Stars: 65
Forks: 29
Avg merge: 11d 21h
Merged PRs (30d): 3

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