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java.lang.Object net.sf.saxon.expr.Expression net.sf.saxon.expr.FunctionCall net.sf.saxon.functions.SystemFunction net.sf.saxon.functions.Matches
public class Matches
This class implements the matches() function for regular expression matching
Field Summary |
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Fields inherited from class net.sf.saxon.functions.SystemFunction |
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operation |
Fields inherited from class net.sf.saxon.expr.FunctionCall |
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argument |
Fields inherited from class net.sf.saxon.expr.Expression |
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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 |
Constructor Summary | |
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Matches()
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Method Summary | |
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boolean |
evalMatches(AtomicValue input,
AtomicValue regex,
CharSequence flags,
XPathContext context)
Interface used by compiled bytecode |
Item |
evaluateItem(XPathContext c)
Evaluate the matches() function to give a Boolean value. |
RegularExpression |
getCompiledRegularExpression()
Get the compiled regular expression, returning null if the regex has not been compiled |
Expression |
optimize(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Perform optimisation of an expression and its subexpressions. |
Expression |
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 |
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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 |
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addExternalFunctionCallToPathMap, checkArgumentCount, explain, getArguments, getDisplayName, getExpressionName, getFunctionName, getNumberOfArguments, hashCode, iterateSubExpressions, preEvaluate, promote, replaceSubExpression, setArguments, setFunctionName, simplifyArguments, toString, typeCheck |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public Matches()
Method Detail |
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public Expression simplify(ExpressionVisitor visitor) throws XPathException
simplify
in class FunctionCall
visitor
- an expression visitor
XPathException
- if any error is found (e.g. invalid regular expression)public Expression optimize(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
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.
optimize
in class SystemFunction
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 to
Type.ITEM_TYPE
XPathException
- if an error is discovered during this phase
(typically a type error)public RegularExpression getCompiledRegularExpression()
public Item evaluateItem(XPathContext c) throws XPathException
evaluateItem
in class Expression
c
- The dynamic evaluation context
XPathException
- on an errorpublic boolean evalMatches(AtomicValue input, AtomicValue regex, CharSequence flags, XPathContext context) throws XPathException
input
- the value to be testedregex
- the regular expressionflags
- the flagscontext
- the dynamic context
XPathException
public static RegularExpression tryToCompile(Expression[] args, int patternArg, int flagsArg, StaticContext env) throws XPathException
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
XPathException
- if any failure occurs, in particular, if the regular
expression is invalid
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