com.saxonica.ee.schema.sdoc

Class SelectionParser

java.lang.Object

net.sf.saxon.expr.parser.XPathParser

com.saxonica.ee.schema.sdoc.SelectionParser

public class SelectionParser
extends XPathParser

This class parses the two XPath subsets defined in XML Schema for handling the "selector" and "field" attributes of the <unique>, <key>, and <keyref> elements.

Nested Class Summary

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

XPathParser.Accelerator, XPathParser.NestedLocation

Field Summary

Fields inherited from class net.sf.saxon.expr.parser.XPathParser

allowSaxonExtensions, allowXPath30Syntax, allowXPath30XSLTExtensions, allowXPath31Syntax, catchDepth, charChecker, codeInjector, env, EXTENDED_ITEM_TYPE, language, languageVersion, parserExtension, qNameParser, rangeVariables, scanOnly, SEQUENCE_TYPE, t, XPATH, XQUERY, XSLT_PATTERN

Constructor Summary

Constructors

Constructor and Description
SelectionParser()

Method Summary

Modifier and Type	Method and Description
Expression	getOptimizedExpression() After parsing a selector, return the optimized version of the XPath expression that was parsed
protected Expression	parseRelativePath() Parse a relative path (a sequence of steps).
Pattern	parseSelector(java.lang.String expression, StaticContext env, boolean isField) Parse a string representing the restricted XPath expression allowed in an XML Schema selector or field attribute
protected Expression	parseStepExpression() Override the general XPath parsing of a StepExpression to support the simpler kind of Step used in XML Schema selectors
protected Expression	parseUnionExpression()

Methods inherited from class net.sf.saxon.expr.parser.XPathParser

atStartOfRelativePath, checkHofFeature, checkLanguageVersion30, checkLanguageVersion31, checkMapExtensions, checkSyntaxExtensions, currentTokenDisplay, customizeTokenizer, declareRangeVariable, disallowedAtStartOfRelativePath, expect, findRangeVariable, generateApplyCall, getCodeInjector, getLanguage, getMissingFunctionExplanation, getPlainType, getQNameParser, getRangeVariables, getStaticContext, getTokenizer, grumble, grumble, grumble, grumble, isAllowAbsentExpression, isAllowXPath31Syntax, isKeyword, isNamespaceTestAllowed, isReservedFunctionName30, isReservedFunctionName31, isReservedInQuery, makeCurriedFunction, makeFingerprint, makeLocalNameTest, makeLocation, makeNamespaceTest, makeNameTest, makeNestedLocation, makeNodeName, makeStringLiteral, makeStructuredQName, makeStructuredQNameSilently, makeTracer, nextToken, operatorPrecedence, parse, parseAnnotationsList, parseArrayCurlyConstructor, parseArrayItemType, parseArraySquareConstructor, parseArrowPostfix, parseBasicStep, parseBinaryExpression, parseConstructor, parseDynamicFunctionCall, parseExpression, parseExprSingle, parseExtendedItemType, parseExtendedSequenceType, parseExtensionExpression, parseFLWORExpression, parseFunctionArgument, parseFunctionCall, parseFunctionItemType, parseInlineFunction, parseItemType, parseLookup, parseMapExpression, parseMapItemType, parseNamedFunctionReference, parseNodeTest, parseNumericLiteral, parseParenthesizedExpression, parsePathExpression, parsePredicate, parsePredicate, parseRemainingPath, parseSequenceType, parseSequenceType, parseSimpleMappingExpression, parseStepExpression, parseStringLiteral, parseStringTemplate, parseSwitchExpression, parseTryCatchExpression, parseTypeswitchExpression, parseValidateExpression, parseVariableReference, reportMissingFunction, resolveFunctionName, setAccelerator, setAllowAbsentExpression, setCatchDepth, setCodeInjector, setLanguage, setLocation, setLocation, setLocation, setParserExtension, setQNameParser, setRangeVariables, setRangeVariableStack, setScanOnly, testPermittedAxis, undeclareRangeVariable, unescape, warning, whyDisallowedType

Methods inherited from class java.lang.Object

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

Constructor Detail

SelectionParser

public SelectionParser()

Method Detail

parseSelector

public Pattern parseSelector(java.lang.String expression,
                             StaticContext env,
                             boolean isField)
                      throws XPathException

Parse a string representing the restricted XPath expression allowed in an XML Schema selector or field attribute

Parameters:

expression - the expression expressed as a String

env - the static context for the expression

isField - true if the attribute is a "field" attribute, false if it is a "selector" attribute

Returns:

a Pattern object representing the result of parsing. The expression equivalent to this pattern may be obtained by calling getOptimizedExpression().

Throws:

XPathException - if the expression contains a syntax error

parseUnionExpression

protected Expression parseUnionExpression()
                                   throws XPathException

Throws:

XPathException

parseRelativePath

protected Expression parseRelativePath()
                                throws XPathException

Description copied from class: XPathParser

Parse a relative path (a sequence of steps). Called when the current token immediately follows a separator (/ or //), or an implicit separator (XYZ is equivalent to ./XYZ)

Overrides:

parseRelativePath in class XPathParser

Returns:

the resulting subexpression

Throws:

XPathException - if any error is encountered

parseStepExpression

protected Expression parseStepExpression()
                                  throws XPathException

Override the general XPath parsing of a StepExpression to support the simpler kind of Step used in XML Schema selectors

Returns:

an Expression, which will always be either an AxisExpression or a ContextItemExpression

Throws:

XPathException - if parsing fails

getOptimizedExpression

public Expression getOptimizedExpression()

After parsing a selector, return the optimized version of the XPath expression that was parsed

Returns:

the optimized XPath expression equivalent to the pattern that was created by parsing the selector