net.sf.saxon.expr.parser

Class ParserExtension

java.lang.Object

net.sf.saxon.expr.parser.ParserExtension

public class ParserExtension
extends Object

Dummy Parser extension for syntax in XPath that is accepted only in Saxon-PE and -EE. Primarily, this means XPath 3.0 syntax associated with higher-order functions.

Constructor Summary

Constructors

Constructor and Description
ParserExtension()

Method Summary

Modifier and Type	Method and Description
Expression	createDynamicCurriedFunction(XPathParser p, Expression functionItem, ArrayList<Expression> args, IntSet placeMarkers)
LocalBinding	findOuterRangeVariable(XPathParser p, StructuredQName qName) When a variable reference occurs within an inline function, it might be a reference to a variable declared outside the inline function (which needs to become part of the closure.
void	handleExternalFunctionDeclaration(XQueryParser p, XQueryFunction func)
Expression	makeArgumentPlaceMarker(XPathParser p) Parse a function argument.
Expression	makeCurriedFunction(XPathParser parser, int offset, StructuredQName name, Expression[] args, IntSet placeMarkers) Process a function call in which one or more of the argument positions are represented as "?" placemarkers (indicating partial application or currying)
protected Expression	parseExtendedExprSingle(XPathParser p)
ItemType	parseExtendedItemType(XPathParser p) Parse an ItemType within a SequenceType
ItemType	parseFunctionItemType(XPathParser p, AnnotationList annotations) Parse the item type used for function items (XQuery 3.0 higher order functions) Syntax (changed by WG decision on 2009-09-22): function '(' '*' ') | function '(' (SeqType (',' SeqType)*)? ')' 'as' SeqType For backwards compatibility with Saxon 9.2 we allow the "*" to be omitted for the time being The "function(" has already been read
protected Expression	parseInlineFunction(XPathParser p, AnnotationList annotations) Parse an inline function "function" "(" ParamList? ")" ("as" SequenceType)? EnclosedExpr On entry, "function (" has already been read
Expression	parseNamedFunctionReference(XPathParser p) Parse a literal function item (function#arity).
void	parseRevalidationDeclaration(XQueryParser p) Parse the "declare revalidation" declaration.
Expression	parseSimpleInlineFunction(XPathParser p)
Expression	parseTildePattern(XPathParser p) Parse an extended XSLT pattern in the form ~type-alias (predicate)*
void	parseTypeAliasDeclaration(XQueryParser p) Parse a type alias declaration.
void	parseUpdatingFunctionDeclaration(XQueryParser p) Parse an updating function declaration (allowed in XQuery Update only)

Methods inherited from class java.lang.Object

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

Constructor Detail

ParserExtension

public ParserExtension()

Method Detail

parseNamedFunctionReference

public Expression parseNamedFunctionReference(XPathParser p)
                                       throws XPathException

Parse a literal function item (function#arity). On entry, the function name and the '#' token have already been read

Parameters:

p - the parser

Returns:

an expression representing the function value

Throws:

XPathException - in the event of a syntax error

parseFunctionItemType

public ItemType parseFunctionItemType(XPathParser p,
                                      AnnotationList annotations)
                               throws XPathException

Parse the item type used for function items (XQuery 3.0 higher order functions) Syntax (changed by WG decision on 2009-09-22): function '(' '*' ') | function '(' (SeqType (',' SeqType)*)? ')' 'as' SeqType For backwards compatibility with Saxon 9.2 we allow the "*" to be omitted for the time being The "function(" has already been read

Parameters:

annotations - the list of annotation assertions for this function item type

Throws:

XPathException

parseExtendedItemType

public ItemType parseExtendedItemType(XPathParser p)
                               throws XPathException

Parse an ItemType within a SequenceType

Returns:

the ItemType after parsing

Throws:

XPathException - if a static error is found

parseTildePattern

public Expression parseTildePattern(XPathParser p)
                             throws XPathException

Parse an extended XSLT pattern in the form ~type-alias (predicate)*

Returns:

the equivalent expression in the form .[. instance of type] (predicate)*

Throws:

XPathException

makeArgumentPlaceMarker

public Expression makeArgumentPlaceMarker(XPathParser p)
                                   throws XPathException

Parse a function argument. The special marker "?" is allowed and causes "null" to be returned

Throws:

XPathException

parseInlineFunction

protected Expression parseInlineFunction(XPathParser p,
                                         AnnotationList annotations)
                                  throws XPathException

Parse an inline function "function" "(" ParamList? ")" ("as" SequenceType)? EnclosedExpr On entry, "function (" has already been read

Throws:

XPathException - if a syntax error is found

parseSimpleInlineFunction

public Expression parseSimpleInlineFunction(XPathParser p)
                                     throws XPathException

Throws:

XPathException

makeCurriedFunction

public Expression makeCurriedFunction(XPathParser parser,
                                      int offset,
                                      StructuredQName name,
                                      Expression[] args,
                                      IntSet placeMarkers)
                               throws XPathException

Process a function call in which one or more of the argument positions are represented as "?" placemarkers (indicating partial application or currying)

Parameters:

offset - offset in the query source of the start of the expression

name - the function call (as if there were no currying)

args - the arguments (with EmptySequence in the placemarker positions)

placeMarkers - the positions of the placemarkers @return the curried function

Throws:

XPathException

findOuterRangeVariable

public LocalBinding findOuterRangeVariable(XPathParser p,
                                           StructuredQName qName)

When a variable reference occurs within an inline function, it might be a reference to a variable declared outside the inline function (which needs to become part of the closure. This code looks for such an outer variable

Parameters:

qName - the name of the variable

Returns:

a binding for the variable; this will typically be a binding to a newly added parameter for the innermost function in which the variable reference appears. As a side effect, all the inline functions between the declaration of the variable and its use will have this variable as an additional parameter, each one bound to the corresponding parameter in the containing function.

createDynamicCurriedFunction

public Expression createDynamicCurriedFunction(XPathParser p,
                                               Expression functionItem,
                                               ArrayList<Expression> args,
                                               IntSet placeMarkers)
                                        throws XPathException

Throws:

XPathException

handleExternalFunctionDeclaration

public void handleExternalFunctionDeclaration(XQueryParser p,
                                              XQueryFunction func)
                                       throws XPathException

Throws:

XPathException

parseTypeAliasDeclaration

public void parseTypeAliasDeclaration(XQueryParser p)
                               throws XPathException

Parse a type alias declaration. Allowed only in Saxon-PE and higher

Throws:

XPathException - if parsing fails

parseRevalidationDeclaration

public void parseRevalidationDeclaration(XQueryParser p)
                                  throws XPathException

Parse the "declare revalidation" declaration. Syntax: not allowed unless XQuery update is in use

Throws:

XPathException - if the syntax is incorrect, or is not allowed in this XQuery processor

parseUpdatingFunctionDeclaration

public void parseUpdatingFunctionDeclaration(XQueryParser p)
                                      throws XPathException

Parse an updating function declaration (allowed in XQuery Update only)

Throws:

XPathException - if parsing fails or if updating functions are not allowed

parseExtendedExprSingle

protected Expression parseExtendedExprSingle(XPathParser p)
                                      throws XPathException

Throws:

XPathException