Package net.sf.saxon.functions
Class Matches
java.lang.Object
net.sf.saxon.expr.Expression
net.sf.saxon.expr.FunctionCall
net.sf.saxon.functions.SystemFunction
net.sf.saxon.functions.Matches
- All Implemented Interfaces:
Serializable
,SourceLocator
,LocationProvider
,SaxonLocator
,InstructionInfo
,Locator
This class implements the matches() function for regular expression matching
- See Also:
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Field Summary
Fields inherited from class net.sf.saxon.functions.SystemFunction
operation
Fields inherited from class net.sf.saxon.expr.FunctionCall
argument
Fields inherited from class net.sf.saxon.expr.Expression
EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, EVENT_FEED_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, PROCESS_METHOD, PUSH_SELECTION, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, WATCH_METHOD
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionboolean
evalMatches
(AtomicValue input, AtomicValue regex, CharSequence flags, XPathContext context) Interface used by compiled bytecodeEvaluate the matches() function to give a Boolean value.Get the compiled regular expression, returning null if the regex has not been compiledoptimize
(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) Perform optimisation of an expression and its subexpressions.simplify
(ExpressionVisitor visitor) Simplify and validate.static RegularExpression
tryToCompile
(Expression[] args, int patternArg, int flagsArg, StaticContext env) Try to precompile the arguments to the function.Methods inherited from class net.sf.saxon.functions.SystemFunction
addContextDocumentArgument, addDocToPathMap, checkArguments, computeCardinality, computeSpecialProperties, copy, equals, getDetails, getErrorCodeForTypeErrors, getImplementationMethod, getItemType, getOperation, getRequiredType, makeSystemFunction, setDetails, useContextItemAsDefault
Methods inherited from class net.sf.saxon.expr.FunctionCall
addExternalFunctionCallToPathMap, checkArgumentCount, explain, getArguments, getDisplayName, getExpressionName, getFunctionName, getNumberOfArguments, hashCode, iterateSubExpressions, preEvaluate, promote, replaceSubExpression, setArguments, setFunctionName, simplifyArguments, toString, typeCheck
Methods inherited from class net.sf.saxon.expr.Expression
addToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, evaluateAsString, evaluatePendingUpdates, explain, getCardinality, getColumnNumber, getColumnNumber, getConstructType, getContainer, getDependencies, getEvaluationMethod, getExecutable, getHostLanguage, getIntegerBounds, getIntrinsicDependencies, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, getSystemId, hasLoopingSubexpression, hasVariableBinding, implementsStaticTypeCheck, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterate, iterateEvents, iterateSameFocusSubExpressions, markTailFunctionCalls, process, resetLocalStaticProperties, setContainer, setEvaluationMethod, setFiltered, setFlattened, setLocationId, staticTypeCheck, suppressValidation, typeError
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Constructor Details
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Matches
public Matches()
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Method Details
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simplify
Simplify and validate. This is a pure function so it can be simplified in advance if the arguments are known- Overrides:
simplify
in classFunctionCall
- Parameters:
visitor
- an expression visitor- Returns:
- the simplified expression
- Throws:
XPathException
- if any error is found (e.g. invalid regular expression)
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optimize
public Expression optimize(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException Perform optimisation of an expression and its subexpressions.This method is called after all references to functions and variables have been resolved to the declaration of the function or variable, and after all type checking has been done.
- Overrides:
optimize
in classSystemFunction
- Parameters:
visitor
- an expression visitorcontextItemType
- the static type of "." at the point where this expression is invoked. The parameter is set to null if it is known statically that the context item will be undefined. If the type of the context item is not known statically, the argument is set toType.ITEM_TYPE
- Returns:
- the original expression, rewritten if appropriate to optimize execution
- Throws:
XPathException
- if an error is discovered during this phase (typically a type error)
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getCompiledRegularExpression
Get the compiled regular expression, returning null if the regex has not been compiled- Returns:
- the compiled regular expression, or null
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evaluateItem
Evaluate the matches() function to give a Boolean value.- Overrides:
evaluateItem
in classExpression
- Parameters:
c
- The dynamic evaluation context- Returns:
- the result as a BooleanValue, or null to indicate the empty sequence
- Throws:
XPathException
- on an error
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evalMatches
public boolean evalMatches(AtomicValue input, AtomicValue regex, CharSequence flags, XPathContext context) throws XPathException Interface used by compiled bytecode- Parameters:
input
- the value to be testedregex
- the regular expressionflags
- the flagscontext
- the dynamic context- Returns:
- true if the string matches the regex
- Throws:
XPathException
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tryToCompile
public static RegularExpression tryToCompile(Expression[] args, int patternArg, int flagsArg, StaticContext env) throws XPathException Try to precompile the arguments to the function. This method is shared by the implementations of the three XPath functions matches(), replace(), and tokenize().- Parameters:
args
- the supplied arguments to the function, as an arraypatternArg
- the position of the argument containing the regular expressionflagsArg
- the position of the argument containing the flagsenv
- the static context- Returns:
- the compiled regular expression, or null indicating that the information is not available statically so it cannot be precompiled
- Throws:
XPathException
- if any failure occurs, in particular, if the regular expression is invalid
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