The existing implementation of the SQL parser is a hand-written, recursive descent parser. There are great advantages of this approach over formal grammar-based, generated parsers (e.g. by using ANTLR). These advantages are, among others:
They can be tuned easily for performance
They are very simple and easy to maintain
It's easy to implement corner cases of the grammar, which might require context (that's a big plus with SQL)
It's the easiest way to bind a grammar to an existing backing expression tree implementation (which is what jOOQ really is)
Nevertheless, there is a grammar available for documentation purposes and it is included in the manual here:
batch ::=
;
query
query ::=
ddlStatement
dmlStatement
blockStatement
ddlStatement ::=
alterTableStatement
alterIndexStatement
alterSchemaStatement
alterSequenceStatement
alterSessionStatement
alterViewStatement
commentStatement
createTableStatement
createIndexStatement
createSchemaStatement
createSequenceStatement
createViewStatement
dropTableStatement
dropIndexStatement
dropViewStatement
dropSequenceStatement
dropSchemaStatement
grantStatement
renameStatement
revokeStatement
setCatalogStatement
setSchemaStatement
truncateStatement
useStatement
dmlStatement ::=
deleteStatement
insertStatement
mergeStatement
selectStatement
updateStatement
proceduralStatement ::=
query
nullStatement
blockStatement ::=
EXECUTE BLOCK AS
BEGIN
proceduralStatement
;
proceduralStatement
;
END
DO
stringLiteral
nullStatement ::=
NULL
alterTableStatement ::=
ALTER TABLE
IF EXISTS
tableName
ADD CONSTRAINT
constraintName
constraint
ADD
constraint
ADD
COLUMN
column
ADD
(
,
CONSTRAINT
constraintName
constraint
constraint
column
)
ALTER
MODIFY
COLUMN
identifier
SET DATA
TYPE
dataType
NOT
NULL
SET
DROP
NOT NULL
RENAME
TO
AS
identifier
COMMENT
=
stringLiteral
DROP
COLUMN
identifier
CASCADE
RESTRICT
DROP CONSTRAINT
constraintName
RENAME
COLUMN
INDEX
CONSTRAINT
identifier
TO
AS
identifier
alterIndexStatement ::=
ALTER INDEX
IF EXISTS
indexName
RENAME
TO
AS
indexName
alterSchemaStatement ::=
ALTER SCHEMA
IF EXISTS
schemaName
RENAME
TO
AS
schemaName
alterSequenceStatement ::=
ALTER SEQUENCE
IF EXISTS
sequenceName
RENAME
TO
AS
sequenceName
RESTART
WITH
unsignedInteger
SET GENERATOR
sequenceName
TO
unsignedInteger
alterSessionStatement ::=
ALTER SESSION
SET CURRENT_SCHEMA
=
schemaName
alterViewStatement ::=
ALTER VIEW
IF EXISTS
tableName
RENAME
TO
AS
tableName
createTableStatement ::=
CREATE
GLOBAL
TEMPORARY
TABLE
IF NOT EXISTS
tableName
AS
select
(
,
CONSTRAINT
constraintName
constraint
constraint
index
column
)
ON COMMIT
DELETE ROWS
DROP
PRESERVE ROWS
COMMENT
=
stringLiteral
createIndexStatement ::=
CREATE
UNIQUE
INDEX
IF NOT EXISTS
indexName
ON
tableName
(
sortFields
)
INCLUDE
(
identifiers
)
WHERE
condition
createSchemaStatement ::=
CREATE SCHEMA
IF NOT EXISTS
schemaName
createSequenceStatement ::=
CREATE
SEQUENCE
GENERATOR
IF NOT EXISTS
sequenceName
createViewStatement ::=
CREATE
OR
ALTER
REPLACE
VIEW
IF NOT EXISTS
tableName
(
fieldNames
)
AS
select
dropTableStatement ::=
DROP
TEMPORARY
TABLE
IF EXISTS
tableName
CASCADE
RESTRICT
dropIndexStatement ::=
DROP INDEX
IF EXISTS
indexName
ON
tableName
dropViewStatement ::=
DROP VIEW
IF EXISTS
tableName
dropSequenceStatement ::=
DROP
SEQUENCE
GENERATOR
IF EXISTS
sequenceName
dropSchemaStatement ::=
DROP SCHEMA
IF EXISTS
schemaName
CASCADE
RESTRICT
renameStatement ::=
RENAME
COLUMN
fieldName
TO
AS
fieldName
INDEX
indexName
TO
AS
indexName
SCHEMA
schemaName
TO
AS
schemaName
SEQUENCE
sequenceName
TO
AS
sequenceName
VIEW
tableName
TO
AS
tableName
TABLE
tableName
TO
AS
tableName
setCatalogStatement ::=
SET CATALOG
catalogName
setSchemaStatement ::=
SET
CURRENT
SCHEMA
CURRENT SQLID
=
schemaName
stringLiteral
useStatement ::=
USE
catalogName
schemaName
truncateStatement ::=
TRUNCATE TABLE
tableName
CONTINUE IDENTITY
RESTART IDENTITY
CASCADE
RESTRICT
grantStatement ::=
GRANT
SELECT
INSERT
UPDATE
DELETE
ON
tableName
TO
userName
roleName
PUBLIC
WITH GRANT OPTION
revokeStatement ::=
REVOKE
GRANT OPTION FOR
SELECT
INSERT
UPDATE
DELETE
ON
tableName
FROM
userName
roleName
PUBLIC
selectStatement ::=
select
insertStatement ::=
with
INSERT
INS
INTO
tableName
(
identifiers
)
values
DEFAULT VALUES
SET
setClauses
select
ON DUPLICATE KEY UPDATE
SET
setClauses
ON DUPLICATE KEY IGNORE
ON CONFLICT
ON CONSTRAINT
constraintName
(
fieldNames
)
DO
NOTHING
UPDATE
SET
setClauses
WHERE
condition
RETURNING
*
fields
values ::=
VALUES
,
(
fields
)
updateStatement ::=
with
UPDATE
UPD
tableName
SET
setClauses
WHERE
condition
RETURNING
*
fields
setClauses ::=
,
setClause
setClause ::=
fieldName
=
field
deleteStatement ::=
with
DELETE
DEL
FROM
tableName
WHERE
condition
RETURNING
*
fields
mergeStatement ::=
with
MERGE
INTO
tableName
AS
identifier
USING
(
select
)
AS
identifier
ON
condition
WHEN
MATCHED
AND
condition
THEN
UPDATE
SET
setClauses
WHERE
condition
WHEN
NOT
MATCHED
AND
condition
THEN
INSERT
(
identifiers
)
VALUES
(
fields
)
WHERE
condition
column ::=
identifier
dataType
NOT
NULL
DEFAULT
ON NULL
concat
ON UPDATE
concat
GENERATED
ALWAYS
BY DEFAULT
ON NULL
AS IDENTITY
(
identity
)
PRIMARY KEY
UNIQUE
KEY
INDEX
CHECK
(
condition
)
REFERENCES
constraintReferenceSpecification
AUTO_INCREMENT
AUTOINCREMENT
IDENTITY
(
signedInteger
,
signedInteger
)
COMMENT
stringLiteral
index ::=
KEY
INDEX
identifier
(
sortFields
)
constraint ::=
PRIMARY KEY
(
fieldNames
)
UNIQUE
KEY
INDEX
(
fieldNames
)
FOREIGN KEY
(
fieldNames
)
REFERENCES
constraintReferenceSpecification
CHECK
(
condition
)
ENABLE
constraintReferenceSpecification ::=
tableName
(
fieldNames
)
ON
DELETE
UPDATE
CASCADE
NO ACTION
RESTRICT
SET DEFAULT
SET NULL
identity ::=
START WITH
LIMIT VALUE
unsignedInteger
INCREMENT BY
unsignedInteger
MAXVALUE
unsignedInteger
NOMAXVALUE
MINVALUE
unsignedInteger
NOMINVALUE
CACHE
unsignedInteger
NOCACHE
CYCLE
NOCYCLE
ORDER
NOORDER
with ::=
WITH
RECURSIVE
,
commonTableExpression
commonTableExpression ::=
identifier
(
identifiers
)
AS
(
select
)
select ::=
with
queryExpressionBody
orderBy
seekFetch
offsetFetch
forUpdate
values
queryExpressionBody ::=
queryTerm
UNION
EXCEPT
MINUS
ALL
DISTINCT
queryTerm
queryTerm ::=
queryPrimary
INTERSECT
ALL
DISTINCT
queryTerm
queryPrimary ::=
(
select
)
SELECT
SEL
distinct
top
selectList
INTO
tableName
tableExpression
distinct ::=
DISTINCT
UNIQUE
ON
(
fields
)
ALL
top ::=
TOP
unsignedInteger
PERCENT
START AT
unsignedInteger
WITH TIES
SKIP
unsignedInteger
FIRST
unsignedInteger
selectList ::=
*
selectField
selectField ::=
field
AS
identifier
tableExpression ::=
FROM
tables
WHERE
condition
connectBy
groupBy
HAVING
condition
WINDOW
windows
connectBy ::=
START WITH
condition
CONNECT BY
NOCYCLE
condition
CONNECT BY
NOCYCLE
condition
START WITH
condition
groupBy ::=
GROUP BY
()
ROLLUP
(
fields
)
CUBE
(
fields
)
GROUPING SETS
(
,
groupingSet
)
fields
WITH ROLLUP
groupingSet ::=
(
fields
)
windows ::=
,
window
window ::=
identifier
AS
(
windowSpecification
)
windowSpecification ::=
PARTITION BY
fields
ORDER BY
sortFields
ROWS
RANGE
BETWEEN
rangeBound
AND
rangeBound
rangeBound
orderBy ::=
ORDER
SIBLINGS
BY
sortFields
seekFetch ::=
SEEK
,
field
FETCH
FIRST
NEXT
unsignedInteger
PERCENT
ROW
ROWS
ONLY
WITH TIES
LIMIT
unsignedInteger
PERCENT
WITH TIES
offsetFetch ::=
OFFSET
unsignedInteger
ROW
ROWS
FETCH
FIRST
NEXT
unsignedInteger
PERCENT
ROW
ROWS
ONLY
WITH TIES
LIMIT
unsignedInteger
PERCENT
WITH TIES
LIMIT
unsignedInteger
PERCENT
WITH TIES
OFFSET
unsignedInteger
,
unsignedInteger
forUpdate ::=
FOR SHARE
FOR UPDATE
OF
fields
NOWAIT
WAIT
unsignedInteger
SKIP LOCKED
sortFields ::=
,
sortField
sortField ::=
field
ASC
DESC
NULLS FIRST
NULLS LAST
tables ::=
,
table
table ::=
lateral
unqualifiedJoin
innerJoin
outerJoin
semiAntiJoin
unqualifiedJoin ::=
CROSS JOIN
CROSS APPLY
OUTER APPLY
NATURAL
LEFT
RIGHT
OUTER
JOIN
lateral
innerJoin ::=
INNER
JOIN
STRAIGHT_JOIN
table
joinQualification
outerJoin ::=
LEFT
RIGHT
FULL
OUTER
JOIN
table
PARTITION BY
(
fields
)
joinQualification
semiAntiJoin ::=
LEFT
SEMI
ANTI
JOIN
table
joinQualification
lateral ::=
LATERAL
tableFactor
tableFactor
tableFactor ::=
tableName
versions
correlationName
tableHints
(
table
)
correlationName
(
select
)
correlationName
tableFunction
correlationName
UNNEST
(
field
)
values
correlationName
tableFunction ::=
GENERATE_SERIES
(
sum
,
sum
,
sum
)
tableHints ::=
WITH
(
,
tableHint
)
pivot ::=
todo
versions ::=
VERSIONS BETWEEN
SCN
TIMESTAMP
MINVALUE
field
AND
MAXVALUE
field
AS OF
SCN
TIMESTAMP
joinQualification ::=
ON
condition
USING
(
identifiers
)
correlationName ::=
AS
identifier
(
identifiers
)
fields ::=
,
field
field ::=
or
condition ::=
or
or ::=
OR
and
and ::=
AND
not
not ::=
NOT
predicate
predicate ::=
EXISTS
(
select
)
concat
comparator
ALL
ANY
SOME
(
select
)
concat
IS
NOT
NULL
DISTINCT FROM
concat
IN
(
select
fields
)
BETWEEN
SYMMETRIC
concat
AND
concat
LIKE
concat
ESCAPE
characterLiteral
@>
concat
concat
*=
concat
concat
=*
concat
row2
OVERLAPS
row2
row2 ::=
ROW
(
field
,
field
)
concat ::=
||
collated
collated ::=
sum
COLLATE
collation
sum ::=
factor
+
-
factor
factor ::=
exp
*
/
%
exp
exp ::=
^
unaryOps
unaryOps ::=
+
-
term
(+)
::
dataType
term ::=
:
identifier
?
stringLiteral
ANY
(
field
)
filter
over
ACOS
(
sum
)
ARRAY_AGG
(
DISTINCT
field
ORDER BY
sortFields
)
filter
over
ASCII
(
field
)
ASIN
(
sum
)
ATAN
(
sum
)
ATN2
ATAN2
(
sum
,
sum
)
ARRAY
[
fields
]
AVG
(
DISTINCT
ALL
field
)
keep
filter
over
BIN_AND
(
field
,
field
)
BIN_SHL
(
field
,
field
)
BIN_SHR
(
field
,
field
)
BIN_OR
(
field
,
field
)
BIN_XOR
(
field
,
field
)
BITAND
(
field
,
field
)
BITOR
(
field
,
field
)
BITXOR
(
field
,
field
)
BIT_AND
(
field
,
field
)
BIT_COUNT
(
field
)
BIT_LENGTH
(
field
)
BIT_NAND
(
field
,
field
)
BIT_NOR
(
field
,
field
)
BIT_NOT
(
field
,
field
)
BIT_OR
(
field
,
field
)
BIT_XNOR
(
field
,
field
)
BITXOR
(
field
,
field
)
BIT_XOR
(
field
,
field
)
case
CAST
(
field
AS
castDataType
)
CEIL
CEILING
(
sum
)
CHARINDEX
(
field
,
field
)
CHAR_LENGTH
(
field
)
CHOOSE
(
,
field
)
COALESCE
(
fields
)
CONCAT
(
fields
)
CONVERT
(
dataType
,
field
)
COS
(
sum
)
COSH
(
sum
)
COT
(
sum
)
COTH
(
sum
)
COUNT
(
*
DISTINCT
ALL
field
)
keep
filter
over
CUME_DIST
(
)
over
(
fields
)
withinGroup
CURRVAL
(
name
stringLiteral
)
CURRENT_DATE
CURRENT_SCHEMA
CURRENT_TIME
CURRENT_TIMESTAMP
CURRENT_USER
dateLiteral
DATEADD
(
datePart
,
field
,
field
)
DATE_TRUNC
(
stringLiteral
,
field
)
DAY
(
field
)
DECODE
(
field
,
field
,
,
field
)
DENSE_RANK
(
)
over
(
fields
)
withinGroup
DEG
DEGREE
(
sum
)
EXTRACT
(
datePart
FROM
field
)
EXP
(
sum
)
EVERY
(
field
)
filter
over
FLOOR
(
sum
)
FIELD
(
field
,
,
field
)
FIRST_VALUE
(
field
)
over
GETDATE
(
)
GREATEST
(
fields
)
GROUP_CONCAT
(
DISTINCT
field
ORDER BY
sortFields
SEPARATOR
stringLiteral
)
GROUP_ID
(
)
GROUPING_ID
(
fields
)
GROUPING
(
fields
)
HOUR
(
field
)
IFNULL
(
field
,
field
)
INSTR
(
field
,
field
)
intervalLiteral
IIF
(
condition
,
field
,
field
)
ISNULL
(
field
,
field
)
LOWER
LCASE
(
field
)
LPAD
(
field
,
field
,
field
)
LTRIM
(
field
)
LEFT
(
field
,
field
)
LEN
(
field
)
LENGTH
(
field
)
LN
(
sum
)
LOG
(
sum
,
unsignedInteger
)
LEVEL
LEAST
(
fields
)
LEAD
(
field
,
unsignedInteger
,
field
)
over
LAG
(
field
,
unsignedInteger
,
field
)
over
LAST_VALUE
(
field
)
over
LISTAGG
(
field
,
stringLiteral
)
withinGroup
over
MIN
(
DISTINCT
ALL
field
)
keep
filter
over
MAX
(
DISTINCT
ALL
field
)
keep
filter
over
MEDIAN
(
field
)
filter
over
MOD
(
field
,
field
)
MODE
(
)
withinGroup
over
MONTH
(
field
)
MINUTE
(
field
)
MID
(
field
,
field
,
field
)
MD5
(
field
)
NVL
(
field
,
field
)
NVL2
(
field
,
field
,
field
)
NULLIF
(
field
,
field
)
NTILE
(
unsignedInteger
)
over
NTH_VALUE
(
field
,
unsignedInteger
)
over
NEXT VALUE FOR
sequenceName
NEXTVAL
(
name
stringLiteral
)
OCTET_LENGTH
(
field
)
POSITION
(
field
IN
field
)
PERCENT_RANK
(
)
over
(
fields
)
withinGroup
PERCENTILE_CONT
PERCENTILE_DISC
(
unsignedNumericLiteral
)
withinGroup
over
POW
POWER
(
field
,
field
)
PRIOR
concat
REGR_SLOPE
REGR_INTERCEPT
REGR_COUNT
REGR_R2
REGR_AVGX
REGR_AVGY
REGR_SXX
REGR_SYY
REGR_SXY
(
sum
,
sum
)
REPLACE
OREPLACE
(
field
,
field
,
field
)
REPEAT
(
field
,
field
)
REVERSE
(
field
)
RPAD
(
field
,
field
,
field
)
RTRIM
(
field
)
RIGHT
(
field
,
field
)
ROW_NUMBER
(
)
over
RANK
(
)
over
(
fields
)
withinGroup
ROUND
(
field
,
unsignedInteger
)
ROWNUM
RAD
RADIAN
(
sum
)
ROW
(
fields
)
SUBSTR
SUBSTRING
(
field
,
sum
,
sum
)
SECOND
(
field
)
SHL
SHIFTLEFT
(
field
,
field
)
SHR
SHIFTRIGHT
(
field
,
field
)
SIGN
(
field
)
SQR
SQRT
(
sum
)
SIN
(
sum
)
SINH
(
sum
)
SPACE
(
field
)
STDDEV_POP
(
field
)
over
STDDEV_SAMP
(
field
)
over
STR_REPLACE
(
field
,
field
,
field
)
SUBSTRING
(
field
FROM
sum
FOR
sum
)
SUM
(
DISTINCT
ALL
field
)
keep
filter
TAN
(
sum
)
TANH
(
sum
)
timeLiteral
timestampLiteral
TO_CHAR
(
field
)
TO_DATE
(
field
,
field
)
TO_NUMBER
(
field
)
TO_TIMESTAMP
(
field
,
field
)
TRANSLATE
OTRANSLATE
(
field
,
field
,
field
)
TRIM
(
field
)
TRUNC
(
field
,
stringLiteral
)
TRUNC
(
sum
,
sum
)
truthValue
UPPER
UCASE
(
field
)
VAR_POP
(
field
)
over
VAR_SAMP
(
field
)
over
WIDTH_BUCKET
(
field
,
field
,
field
,
field
)
binaryLiteral
YEAR
(
field
)
unsignedNumericLiteral
(
select
)
(
fields
)
{
d
stringLiteral
}
{
t
stringLiteral
}
{
fn
term
}
{
ts
stringLiteral
}
truthValue ::=
TRUE
FALSE
NULL
datePart ::=
YEAR
MONTH
DAY
HOUR
MINUTE
SECOND
keep ::=
KEEP
(
DENSE_RANK
FIRST
LAST
ORDER BY
sortFields
)
filter ::=
FILTER
(
WHERE
condition
)
over ::=
FROM FIRST
FROM LAST
RESPECT NULLS
IGNORE NULLS
OVER
identifier
(
windowSpecification
)
withinGroup ::=
WITHIN GROUP
(
ORDER BY
sortFields
)
rangeBound ::=
UNBOUNDED
unsignedInteger
PRECEDING
FOLLOWING
CURRENT ROW
case ::=
CASE
WHEN
condition
THEN
field
field
WHEN
field
THEN
field
ELSE
field
END
comparator ::=
=
!=
<>
>=
>
<=>
<=
<
castDataType ::=
dataType
SIGNED
INTEGER
UNSIGNED
INTEGER
dataType ::=
BIGINT
UNSIGNED
BINARY
(
unsignedInteger
)
BIT
(
unsignedInteger
)
BLOB
(
unsignedInteger
)
BOOLEAN
CHAR
(
unsignedInteger
)
BYTE
CHAR
COLLATE
collationName
CHARACTER
(
unsignedInteger
)
BYTE
CHAR
COLLATE
collationName
CLOB
(
unsignedInteger
)
COLLATE
collationName
DATE
DECIMAL
(
unsignedInteger
,
unsignedInteger
)
DOUBLE
PRECISION
(
unsignedInteger
,
unsignedInteger
)
ENUM
(
stringLiteral
,
stringLiteral
)
COLLATE
collationName
FLOAT
(
unsignedInteger
,
unsignedInteger
)
INT
(
unsignedInteger
)
UNSIGNED
INTEGER
(
unsignedInteger
)
UNSIGNED
LONGBLOB
LONGTEXT
COLLATE
collationName
LONG NVARCHAR
(
unsignedInteger
)
COLLATE
collationName
LONG VARBINARY
(
unsignedInteger
)
LONG VARCHAR
(
unsignedInteger
)
COLLATE
collationName
MEDIUMBLOB
MEDIUMINT
(
unsignedInteger
)
UNSIGNED
MEDIUMTEXT
COLLATE
collationName
NCHAR
(
unsignedInteger
)
COLLATE
collationName
NCLOB
COLLATE
collationName
NUMBER
(
unsignedInteger
,
unsignedInteger
)
NUMERIC
(
unsignedInteger
,
unsignedInteger
)
NVARCHAR
(
unsignedInteger
)
COLLATE
collationName
REAL
(
unsignedInteger
,
unsignedInteger
)
SERIAL
SERIAL4
SERIAL8
SET
(
stringLiteral
,
stringLiteral
)
COLLATE
collationName
SMALLINT
(
unsignedInteger
)
UNSIGNED
TEXT
(
unsignedInteger
)
COLLATE
collationName
TIMESTAMP
(
unsignedInteger
)
WITH
WITHOUT
TIME ZONE
TIMESTAMPTZ
(
unsignedInteger
)
TIME
(
unsignedInteger
)
WITH
WITHOUT
TIME ZONE
TIMETZ
(
unsignedInteger
)
TINYBLOB
TINYINT
(
unsignedInteger
)
UNSIGNED
TINYTEXT
COLLATE
collationName
UUID
VARCHAR
(
unsignedInteger
BYTE
CHAR
)
COLLATE
collationName
VARCHAR2
(
unsignedInteger
)
BYTE
CHAR
COLLATE
collationName
CHARACTER VARYING
(
unsignedInteger
)
BYTE
CHAR
COLLATE
collationName
VARBINARY
(
unsignedInteger
)
constraintName ::=
identifier
catalogName ::=
name
schemaName ::=
name
tableName ::=
name
indexName ::=
name
sequenceName ::=
name
userName ::=
name
roleName ::=
name
fieldNames ::=
,
fieldName
fieldName ::=
name
collation ::=
name
name ::=
.
identifier
stringLiteral ::=
'
character
'
q'[
characters
]'
q'{
characters
}'
q'(
characters
)'
q'<
characters
>'
q'
nonSpaceCharacter
characters
nonSpaceCharacter
'
characterLiteral ::=
'
character
'
dateLiteral ::=
DATE
stringLiteral
timeLiteral ::=
TIME
stringLiteral
timestampLiteral ::=
TIMESTAMP
stringLiteral
intervalLiteral ::=
INTERVAL
stringLiteral
signedInteger ::=
todo
unsignedInteger ::=
todo
unsignedNumericLiteral ::=
todo
identifiers ::=
,
identifier
identifier ::=
identifierStart
identifierPart
"
doubleQuotedIdentifierPart
"
`
backtickQuotedIdentifierPart
`
[
brackedQuotedIdentifierPart
]
identifierStart ::=
todo
identifierPart ::=
todo
doubleQuotedIdentifierPart ::=
nonDoubleQuoteCharacter
doubleQuote
backtickQuotedIdentifierPart ::=
nonBacktickCharacter
doubleBacktick
brackedQuotedIdentifierPart ::=
nonClosingBracketCharacter
doubleClosingBracket
nonDoubleQuoteCharacter ::=
todo
nonBacktickCharacter ::=
todo
nonClosingBracketCharacter ::=
todo
doubleQuote ::=
""
doubleBacktick ::=
``
doubleClosingBracket ::=
]]
The diagrams have been created with the neat RRDiagram library by Christopher Deckers .
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