net.sf.saxon.query
Class QueryParser

java.lang.Object
  net.sf.saxon.expr.ExpressionParser
      net.sf.saxon.query.QueryParser

 class QueryParser
extends ExpressionParser

This class defines extensions to the XPath parser to handle the additional syntax supported in XQuery

Nested Class Summary

Nested classes/interfaces inherited from class net.sf.saxon.expr.ExpressionParser

ExpressionParser.ForClause, ExpressionParser.TemporaryContainer

Field Summary

protected Executable	executable
Set	importedModules
(package private) List	moduleImports
(package private) List	namespacesToBeSealed
(package private) List	schemaImports

Fields inherited from class net.sf.saxon.expr.ExpressionParser

env, language, nameChecker, rangeVariables, scanOnly, SEQUENCE_TYPE, t, XPATH, XQUERY, XSLT_PATTERN

Constructor Summary

protected

QueryParser() Protected Constructor: this class should be instantiated via the StaticQueryContext

Method Summary

void	applyModuleImport(net.sf.saxon.query.QueryParser.Import mImport)
Executable	getExecutable() Get the executable containing this expression.
protected String	getLanguage() Get the current language (XPath or XQuery)
protected void	grumble(String message, String errorCode) Report a static error
static Expression	makeStringJoin(Expression exp, StaticContext env) Make a string-join expression that concatenates the string-values of items in a sequence with intervening spaces.
protected StringValue	makeStringLiteral(String token) Method to make a string literal from a token identified as a string literal.
XQueryExpression	makeXQueryExpression(String query, StaticQueryContext staticContext, Configuration config) Create an XQueryExpression
protected Expression	parseConstructor() Parse a node constructor.
protected Expression	parseExtensionExpression() Parse an Extension Expression.
protected Expression	parseForExpression() Parse a FLWOR expression.
void	parseLibraryModule(String queryString, StaticQueryContext env) Parse a library module.
protected Expression	parseTypeswitchExpression() Parse a Typeswitch Expression.
protected Expression	parseValidateExpression() Parse a Validate Expression.
Expression	setDefaultValue(String exp) Parse the expression (inside a string literal) used to define default values for external variables.
void	setExecutable(Executable exec) Set the executable used for this query expression

Methods inherited from class net.sf.saxon.expr.ExpressionParser

currentTokenDisplay, declareRangeVariable, expect, getRangeVariableStack, getTokenizer, grumble, isKeyword, makeLocalNameTest, makeNameCode, makeNamespaceTest, makeNameTest, makeTracer, nextToken, parse, parseExpression, parseExprSingle, parseMappingExpression, parseNodeTest, parsePattern, parseRelativePath, parseRemainingPath, parseSequenceType, parseSequenceType, parseStepExpression, setLocation, setLocation, setRangeVariableStack, setScanOnly, undeclareRangeVariable, warning

Methods inherited from class java.lang.Object

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

Field Detail

executable

protected Executable executable

importedModules

public Set importedModules

namespacesToBeSealed

List namespacesToBeSealed

schemaImports

List schemaImports

moduleImports

List moduleImports

Constructor Detail

QueryParser

protected QueryParser()

Protected Constructor: this class should be instantiated via the StaticQueryContext

Method Detail

makeXQueryExpression

public XQueryExpression makeXQueryExpression(String query,
                                             StaticQueryContext staticContext,
                                             Configuration config)
                                      throws XPathException

Create an XQueryExpression

Throws:

XPathException

getExecutable

public Executable getExecutable()

Get the executable containing this expression.

setExecutable

public void setExecutable(Executable exec)

Set the executable used for this query expression

parseLibraryModule

public final void parseLibraryModule(String queryString,
                                     StaticQueryContext env)
                              throws StaticError

Parse a library module. Prolog? Expression

Parameters:

queryString - The text of the library module.

env - The static context. The result of parsing a library module is that the static context is populated with a set of function declarations and variable declarations. Each library module must have its own static context objext.

Throws:

StaticError - if the expression contains a syntax error

grumble

protected void grumble(String message,
                       String errorCode)
                throws StaticError

Report a static error

Overrides:

grumble in class ExpressionParser

Parameters:

message - the error message

errorCode - the error code

Throws:

StaticError - always thrown: an exception containing the supplied message

applyModuleImport

public void applyModuleImport(net.sf.saxon.query.QueryParser.Import mImport)
                       throws StaticError

Throws:

StaticError

setDefaultValue

public Expression setDefaultValue(String exp)

Parse the expression (inside a string literal) used to define default values for external variables. This requires instantiating a nested XPath parser.

parseForExpression

protected Expression parseForExpression()
                                 throws StaticError

Parse a FLWOR expression. This replaces the XPath "for" expression. Full syntax:

[41] FLWORExpr ::= (ForClause | LetClause)+ WhereClause? OrderByClause? "return" ExprSingle [42] ForClause ::= <"for" "$"> VarName TypeDeclaration? PositionalVar? "in" ExprSingle ("," "$" VarName TypeDeclaration? PositionalVar? "in" ExprSingle)* [43] PositionalVar ::= "at" "$" VarName [44] LetClause ::= <"let" "$"> VarName TypeDeclaration? ":=" ExprSingle ("," "$" VarName TypeDeclaration? ":=" ExprSingle)* [45] WhereClause ::= "where" Expr [46] OrderByClause ::= (<"order" "by"> | <"stable" "order" "by">) OrderSpecList [47] OrderSpecList ::= OrderSpec ("," OrderSpec)* [48] OrderSpec ::= ExprSingle OrderModifier [49] OrderModifier ::= ("ascending" | "descending")? (<"empty" "greatest"> | <"empty" "least">)? ("collation" StringLiteral)?

Overrides:

parseForExpression in class ExpressionParser

Returns:

the resulting subexpression

Throws:

StaticError - if any error is encountered

makeStringJoin

public static Expression makeStringJoin(Expression exp,
                                        StaticContext env)

Make a string-join expression that concatenates the string-values of items in a sequence with intervening spaces. This may be simplified later as a result of type-checking.

parseTypeswitchExpression

protected Expression parseTypeswitchExpression()
                                        throws StaticError

Parse a Typeswitch Expression. This construct is XQuery-only. TypeswitchExpr ::= "typeswitch" "(" Expr ")" CaseClause+ "default" ("$" VarName)? "return" ExprSingle CaseClause ::= "case" ("$" VarName "as")? SequenceType "return" Expr

Overrides:

parseTypeswitchExpression in class ExpressionParser

Throws:

StaticError

parseValidateExpression

protected Expression parseValidateExpression()
                                      throws StaticError

Parse a Validate Expression. This construct is XQuery-only. The syntax allows: validate mode? { Expr } mode ::= "strict" | "lax"

Overrides:

parseValidateExpression in class ExpressionParser

Throws:

StaticError

parseExtensionExpression

protected Expression parseExtensionExpression()
                                       throws StaticError

Parse an Extension Expression. Syntax: "(#" QName arbitrary-text "#)")+ "{" expr? "}"

Overrides:

parseExtensionExpression in class ExpressionParser

Throws:

StaticError

parseConstructor

protected Expression parseConstructor()
                               throws StaticError

Parse a node constructor. This is allowed only in XQuery. This method handles both the XML-like "direct" constructors, and the XQuery-based "computed" constructors.

Overrides:

parseConstructor in class ExpressionParser

Returns:

an Expression for evaluating the parsed constructor

Throws:

StaticError - in the event of a syntax error.

makeStringLiteral

protected StringValue makeStringLiteral(String token)
                                 throws StaticError

Method to make a string literal from a token identified as a string literal. This is trivial in XPath, but in XQuery the method is overridden to identify pseudo-XML character and entity references

Overrides:

makeStringLiteral in class ExpressionParser

Parameters:

token -

Returns:

The string value of the string literal, after dereferencing entity and character references

Throws:

StaticError

getLanguage

protected String getLanguage()

Get the current language (XPath or XQuery)

Overrides:

getLanguage in class ExpressionParser