/**
* Analyze a picture string into two sub-pictures.
*
* @param picture the picture as written (possibly two subpictures separated by a semicolon)
* @param dfs the decimal format symbols
* @return an array of two sub-pictures, the positive and the negative sub-pictures respectively.
* If there is only one sub-picture, the second one is null.
*/
private SubPicture[] getSubPictures(String picture, DecimalSymbols dfs) throws XPathException {
int[] picture4 = StringValue.expand(picture);
SubPicture[] pics = new SubPicture[2];
if (picture4.length == 0) {
XPathException err = new XPathException("format-number() picture is zero-length");
err.setErrorCode("XTDE1310");
throw err;
}
int sep = -1;
for (int c = 0; c < picture4.length; c++) {
if (picture4[c] == dfs.patternSeparator) {
if (c == 0) {
grumble("first subpicture is zero-length");
} else if (sep >= 0) {
grumble("more than one pattern separator");
} else if (sep == picture4.length - 1) {
grumble("second subpicture is zero-length");
}
sep = c;
}
}
if (sep < 0) {
pics[0] = new SubPicture(picture4, dfs);
pics[1] = null;
} else {
int[] pic0 = new int[sep];
System.arraycopy(picture4, 0, pic0, 0, sep);
int[] pic1 = new int[picture4.length - sep - 1];
System.arraycopy(picture4, sep + 1, pic1, 0, picture4.length - sep - 1);
pics[0] = new SubPicture(pic0, dfs);
pics[1] = new SubPicture(pic1, dfs);
}
return pics;
}
public void checkArguments(ExpressionVisitor visitor) throws XPathException {
StaticContext env = visitor.getStaticContext();
if (checked) return;
checked = true;
super.checkArguments(visitor);
if (argument[1] instanceof StringLiteral) {
// picture is known statically - optimize for this common case
picture = ((StringLiteral) argument[1]).getStringValue();
}
if (argument.length == 3) {
if (argument[2] instanceof StringLiteral) {
// common case, decimal format name is supplied as a string literal
String lexicalName = ((StringLiteral) argument[2]).getStringValue();
StructuredQName qName;
try {
qName =
StructuredQName.fromLexicalQName(
lexicalName,
false,
visitor.getConfiguration().getNameChecker(),
env.getNamespaceResolver());
} catch (XPathException e) {
XPathException se = new XPathException("Invalid decimal format name. " + e.getMessage());
se.setErrorCode("XTDE1280");
throw se;
}
DecimalFormatManager dfm =
((ExpressionContext) env).getXSLStylesheet().getDecimalFormatManager();
requireFixup = true;
dfm.registerUsage(qName, this);
// this causes a callback to the fixup() method, either now, or later if it's a forwards
// reference
} else {
// we need to save the namespace context
nsContext = env.getNamespaceResolver();
}
} else {
// two arguments only: it uses the default decimal format
if (env instanceof ExpressionContext) {
// this is XSLT
DecimalFormatManager dfm =
((ExpressionContext) env).getXSLStylesheet().getDecimalFormatManager();
dfm.registerUsage(DecimalFormatManager.DEFAULT_NAME, this);
// Note: if using the "default default", there will be no fixup call.
} else {
// using saxon:decimal-format in some other environment
}
}
}
/** Evaluate in a context where a string is wanted */
public CharSequence evaluateAsString(XPathContext context) throws XPathException {
int numArgs = argument.length;
Controller ctrl = context.getController();
DecimalSymbols dfs = decimalFormatSymbols;
AtomicValue av0 = (AtomicValue) argument[0].evaluateItem(context);
if (av0 == null) {
av0 = DoubleValue.NaN;
}
NumericValue number = (NumericValue) av0;
if (dfs == null) {
// the decimal-format name was not resolved statically
if (requireFixup) {
// we registered for a fixup, but none came
dynamicError("Unknown decimal format name", "XTDE1280", context);
return null;
}
DecimalFormatManager dfm = ctrl.getExecutable().getDecimalFormatManager();
if (numArgs == 2) {
dfs = dfm.getDefaultDecimalFormat();
} else {
// the decimal-format name was given as a run-time expression
String lexicalName = argument[2].evaluateItem(context).getStringValue();
StructuredQName qName = null;
try {
qName =
StructuredQName.fromLexicalQName(
lexicalName, false, context.getConfiguration().getNameChecker(), nsContext);
} catch (XPathException e) {
dynamicError("Invalid decimal format name. " + e.getMessage(), "XTDE1280", context);
}
dfs = dfm.getNamedDecimalFormat(qName);
if (dfs == null) {
dynamicError(
"format-number function: decimal-format '" + lexicalName + "' is not defined",
"XTDE1280",
context);
return null;
}
}
}
SubPicture[] pics = subPictures;
if (pics == null) {
String format = argument[1].evaluateItem(context).getStringValue();
pics = getSubPictures(format, dfs);
}
return formatNumber(number, pics, dfs).toString();
}
public void visitLocationStep(LocationStep locationStep) {
super.visitLocationStep(locationStep);
boolean optimize = false;
// only location steps with predicates can be optimized:
if (locationStep.hasPredicates()) {
List preds = locationStep.getPredicates();
// walk through the predicates attached to the current location step.
// try to find a predicate containing an expression which is an instance
// of Optimizable.
for (Iterator i = preds.iterator(); i.hasNext(); ) {
Predicate pred = (Predicate) i.next();
FindOptimizable find = new FindOptimizable();
pred.accept(find);
List list = find.getOptimizables();
if (list.size() > 0 && canOptimize(list)) {
optimize = true;
break;
}
}
}
if (optimize) {
// we found at least one Optimizable. Rewrite the whole expression and
// enclose it in an (#exist:optimize#) pragma.
Expression parent = locationStep.getParent();
if (!(parent instanceof PathExpr)) {
LOG.warn("Parent expression of step is not a PathExpr: " + parent);
return;
}
if (LOG.isTraceEnabled())
LOG.trace("Rewriting expression: " + ExpressionDumper.dump(locationStep));
hasOptimized = true;
PathExpr path = (PathExpr) parent;
try {
// Create the pragma
ExtensionExpression extension = new ExtensionExpression(context);
extension.addPragma(new Optimize(context, Optimize.OPTIMIZE_PRAGMA, null, false));
extension.setExpression(locationStep);
// Replace the old expression with the pragma
path.replaceExpression(locationStep, extension);
} catch (XPathException e) {
LOG.warn("Failed to optimize expression: " + locationStep + ": " + e.getMessage(), e);
}
}
}
