gudusoft.gsqlparser.parser

Class RoutineBodyRecovery

Object

gudusoft.gsqlparser.parser.RoutineBodyRecovery

public final class RoutineBodyRecovery
extends Object

Locates the statements to skip in a T-SQL routine (CREATE/ALTER PROCEDURE, FUNCTION or TRIGGER) whose body holds statements the grammar rejects. Without recovery such a routine fails as a whole and keeps no body statement, so one statement GSP cannot parse loses the lineage of every other statement in it.

For each syntax error the statement around it is found -- the innermost statement inside the innermost BEGIN ... END (or BEGIN TRY/CATCH) block that holds the error, delimited by the vendor's own raw statement splitter -- and its tokens are returned. TGSqlParser makes them ignorable (TBaseType.sqlpluscmd, as CREATE TABLE recovery does for options it cannot parse) and parses the routine again: the same statement over the same tokens, so every position stays the original one. Whenever something is uncertain -- an error in the routine's header, a block structure that does not balance, an error no statement holds -- no token is returned and the routine fails as it always did.

Method Summary

Modifier and Type	Method and Description
static boolean	appliesTo(EDbVendor vendor, ESqlStatementType type) The vendors and statement types the recovery applies to: T-SQL routines.
static List<TSourceToken>	tokensToIgnore(TCustomSqlStatement routine, List<TSyntaxError> errors, EDbVendor vendor) The tokens of the statements that hold errors, to make ignorable so that the rest of routine parses; empty when any error cannot be placed in a statement of the routine's body, or when the body's blocks do not balance (no region is certain then, and the whole body is no statement to skip).

Methods inherited from class Object

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

Method Detail

appliesTo

public static boolean appliesTo(EDbVendor vendor,
                                ESqlStatementType type)

The vendors and statement types the recovery applies to: T-SQL routines.

tokensToIgnore

public static List<TSourceToken> tokensToIgnore(TCustomSqlStatement routine,
                                                List<TSyntaxError> errors,
                                                EDbVendor vendor)

The tokens of the statements that hold errors, to make ignorable so that the rest of routine parses; empty when any error cannot be placed in a statement of the routine's body, or when the body's blocks do not balance (no region is certain then, and the whole body is no statement to skip).