gudusoft.gsqlparser.demos.prettyscore

Class SyntaxDegrader

Object

gudusoft.gsqlparser.demos.prettyscore.SyntaxDegrader

public final class SyntaxDegrader
extends Object

Derives syntax-broken samples from a clean SQL text with a fixed seed so a corpus of "real-looking" parse failures can be regenerated in CI without checking the derived files in. Three degradations, applied in rotation:

• SyntaxDegrader.Kind.TRUNCATE — drop the trailing 10-40% of the tokens at a token boundary.
• SyntaxDegrader.Kind.DROP_PAREN — remove one random ( or ).
• SyntaxDegrader.Kind.INSERT_KEYWORD — insert FOOBAR before a random clause keyword.

These samples are meant for the pp2 (tolerant) engine; pp is expected to reject them.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SyntaxDegrader.Kind
static class	SyntaxDegrader.Sample A derived sample.

Method Summary

Modifier and Type	Method and Description
static SyntaxDegrader.Sample	degrade(String sql, EDbVendor vendor, long seed, int index) Degrade sql with the index-th kind (rotating) and a seed derived from seed and index, verifying that the result no longer parses; up to five re-seeded attempts rotate through the kinds, and a sample that still parses after that is returned flagged SyntaxDegrader.Sample.stillParses.
static SyntaxDegrader.Sample	degrade(String sql, EDbVendor vendor, long seed, SyntaxDegrader.Kind kind)

Methods inherited from class Object

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

Method Detail

degrade

public static SyntaxDegrader.Sample degrade(String sql,
                                            EDbVendor vendor,
                                            long seed,
                                            int index)

Degrade sql with the index-th kind (rotating) and a seed derived from seed and index, verifying that the result no longer parses; up to five re-seeded attempts rotate through the kinds, and a sample that still parses after that is returned flagged SyntaxDegrader.Sample.stillParses.

degrade

public static SyntaxDegrader.Sample degrade(String sql,
                                            EDbVendor vendor,
                                            long seed,
                                            SyntaxDegrader.Kind kind)