/**
* Try to precompile the arguments to the function. This method is shared by the implementations
* of the three XPath functions matches(), replace(), and tokenize().
*
* @param args the supplied arguments to the function, as an array
* @param patternArg the position of the argument containing the regular expression
* @param flagsArg the position of the argument containing the flags
* @return 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
*/
public static RegularExpression tryToCompile(
Expression[] args, int patternArg, int flagsArg, StaticContext env) throws XPathException {
if (patternArg > args.length - 1) {
// too few arguments were supplied; the error will be reported in due course
return null;
}
CharSequence flagstr = null;
if (args.length - 1 < flagsArg) {
flagstr = "";
} else if (args[flagsArg] instanceof StringValue) {
flagstr = ((StringValue) args[flagsArg]).getStringValueCS();
}
if (args[patternArg] instanceof StringValue && flagstr != null) {
try {
Platform platform = env.getConfiguration().getPlatform();
CharSequence in = ((StringValue) args[patternArg]).getStringValueCS();
RegularExpression regexp = platform.compileRegularExpression(in, true, flagstr);
return regexp;
} catch (XPathException err) {
StaticError e2 = new StaticError(err.getMessage());
e2.setErrorCode("FORX0002");
throw e2;
}
} else {
return null;
}
}
/**
* Set the expression defining the value of the attribute. If this is a constant, and if
* validation against a schema type was requested, the validation is done immediately.
*
* @param select The expression defining the content of the attribute
* @param config
* @throws StaticError if the expression is a constant, and validation is requested, and the
* constant doesn't match the required type.
*/
public void setSelect(Expression select, Configuration config) throws StaticError {
super.setSelect(select, config);
// Attempt early validation if possible
if (select instanceof AtomicValue && schemaType != null && !schemaType.isNamespaceSensitive()) {
CharSequence value = ((AtomicValue) select).getStringValueCS();
XPathException err =
schemaType.validateContent(
value, DummyNamespaceResolver.getInstance(), config.getNameChecker());
if (err != null) {
StaticError se =
new StaticError(
"Attribute value "
+ Err.wrap(value, Err.VALUE)
+ " does not the match the required type "
+ schemaType.getDescription()
+ ". "
+ err.getMessage());
se.setErrorCode("XTTE1540");
throw se;
}
}
// If value is fixed, test whether there are any special characters that might need to be
// escaped when the time comes for serialization
if (select instanceof StringValue) {
boolean special = false;
CharSequence val = ((StringValue) select).getStringValueCS();
for (int k = 0; k < val.length(); k++) {
char c = val.charAt(k);
if ((int) c < 33 || (int) c > 126 || c == '<' || c == '>' || c == '&' || c == '\"') {
special = true;
break;
}
}
if (!special) {
this.options |= ReceiverOptions.NO_SPECIAL_CHARS;
}
}
// If attribute name is xml:id, add whitespace normalization
if ((nameCode & NamePool.FP_MASK) == StandardNames.XML_ID) {
Expression[] args = {select};
FunctionCall fn =
SystemFunction.makeSystemFunction("normalize-space", 1, config.getNamePool());
fn.setArguments(args);
select = fn;
super.setSelect(select, config);
}
}
/**
* Simplify and validate. This is a pure function so it can be simplified in advance if the
* arguments are known
*
* @return the simplified expression
* @throws net.sf.saxon.trans.StaticError if any error is found (e.g. invalid regular expression)
*/
public Expression simplify(StaticContext env) throws XPathException {
Expression e = simplifyArguments(env);
// compile the regular expression once if possible
if (regexp == null && !(e instanceof Value)) {
try {
regexp = tryToCompile(argument, 1, 2, env);
} catch (StaticError err) {
err.setLocator(this);
throw err;
}
}
return e;
}
/** Type-check the expression. */
public Expression analyze(StaticContext env, ItemType contextItemType) throws XPathException {
if (contextItemType == null) {
StaticError err = new StaticError("Cannot select a node here: the context item is undefined");
err.setIsTypeError(true);
err.setLocator(this);
throw err;
}
if (contextItemType instanceof AtomicType) {
StaticError err =
new StaticError("Cannot select a node here: the context item is an atomic value");
err.setIsTypeError(true);
err.setLocator(this);
throw err;
}
return this;
}
public void checkArguments(StaticContext env) throws XPathException {
if (checked) return;
checked = true;
super.checkArguments(env);
Optimizer opt = env.getConfiguration().getOptimizer();
argument[1] = ExpressionTool.unsorted(opt, argument[1], false);
if (argument[0] instanceof StringValue) {
// common case, key name is supplied as a constant
try {
keyFingerprint =
((ExpressionContext) env)
.getFingerprint(((StringValue) argument[0]).getStringValue(), false);
} catch (XPathException e) {
StaticError err =
new StaticError(
"Error in key name "
+ ((StringValue) argument[0]).getStringValue()
+ ": "
+ e.getMessage());
err.setLocator(this);
err.setErrorCode("XTDE1260");
throw err;
}
if (keyFingerprint == -1) {
StaticError err =
new StaticError(
"Key " + ((StringValue) argument[0]).getStringValue() + " has not been defined");
err.setLocator(this);
err.setErrorCode("XTDE1260");
throw err;
}
} else {
// we need to save the namespace context
nsContext = env.getNamespaceResolver();
}
}
/**
* Check that any elements and attributes constructed or returned by this expression are
* acceptable in the content model of a given complex type. It's always OK to say yes, since the
* check will be repeated at run-time. The process of checking element and attribute constructors
* against the content model of a complex type also registers the type of content expected of
* those constructors, so the static validation can continue recursively.
*/
public void checkPermittedContents(SchemaType parentType, StaticContext env, boolean whole)
throws XPathException {
int fp = nameCode & NamePool.FP_MASK;
if (fp == StandardNames.XSI_TYPE
|| fp == StandardNames.XSI_SCHEMA_LOCATION
|| fp == StandardNames.XSI_NIL
|| fp == StandardNames.XSI_NO_NAMESPACE_SCHEMA_LOCATION) {
return;
}
if (parentType instanceof SimpleType) {
StaticError err =
new StaticError(
"Attribute "
+ env.getNamePool().getDisplayName(nameCode)
+ " is not permitted in the content model of the simple type "
+ parentType.getDescription());
err.setIsTypeError(true);
err.setLocator(this);
if (getHostLanguage() == Configuration.XSLT) {
err.setErrorCode("XTTE1510");
} else {
err.setErrorCode("XQDY0027");
}
throw err;
}
SchemaType type;
try {
type = ((ComplexType) parentType).getAttributeUseType(fp);
} catch (SchemaException e) {
throw new StaticError(e);
}
if (type == null) {
StaticError err =
new StaticError(
"Attribute "
+ env.getNamePool().getDisplayName(nameCode)
+ " is not permitted in the content model of the complex type "
+ parentType.getDescription());
err.setIsTypeError(true);
err.setLocator(this);
if (getHostLanguage() == Configuration.XSLT) {
err.setErrorCode("XTTE1510");
} else {
err.setErrorCode("XQDY0027");
}
throw err;
}
if (type instanceof AnyType) {
return;
}
try {
select.checkPermittedContents(type, env, true);
// TODO: does this allow for the fact that the content will be atomized?
} catch (XPathException e) {
if (e.getLocator() == null || e.getLocator() == e) {
e.setLocator(this);
}
throw e;
}
}