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The XSLT and XQuery Processor
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2018-2022 Saxonica Limited
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is "Incompatible With Secondary Licenses", as defined by the Mozilla Public License, v. 2.0.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
package net.sf.saxon.style;
import net.sf.saxon.Configuration;
import net.sf.saxon.expr.Component;
import net.sf.saxon.expr.ErrorExpression;
import net.sf.saxon.expr.Expression;
import net.sf.saxon.expr.StaticProperty;
import net.sf.saxon.expr.instruct.NamedTemplate;
import net.sf.saxon.expr.instruct.SlotManager;
import net.sf.saxon.expr.instruct.TemplateRule;
import net.sf.saxon.expr.parser.*;
import net.sf.saxon.lib.Feature;
import net.sf.saxon.lib.Logger;
import net.sf.saxon.lib.NamespaceConstant;
import net.sf.saxon.om.*;
import net.sf.saxon.pattern.Pattern;
import net.sf.saxon.s9api.HostLanguage;
import net.sf.saxon.trans.*;
import net.sf.saxon.trans.rules.Rule;
import net.sf.saxon.trans.rules.RuleManager;
import net.sf.saxon.type.Affinity;
import net.sf.saxon.type.AnyItemType;
import net.sf.saxon.type.ErrorType;
import net.sf.saxon.type.ItemType;
import net.sf.saxon.value.BigDecimalValue;
import net.sf.saxon.value.SequenceType;
import net.sf.saxon.value.Whitespace;
import java.util.*;
/**
* An xsl:template element in the style sheet.
*/
public final class XSLTemplate extends StyleElement implements StylesheetComponent {
private String matchAtt = null;
private String modeAtt = null;
private String nameAtt = null;
private String priorityAtt = null;
private String asAtt = null;
private String visibilityAtt = null;
private StructuredQName[] modeNames;
private String diagnosticId;
private Pattern match;
private boolean prioritySpecified;
private double priority;
private SlotManager stackFrameMap;
// A compiled named template exists if the template has a name
private NamedTemplate compiledNamedTemplate;
// A set of compiled template rules exists if the template has a match pattern: one TemplateRule for each mode
private final Map compiledTemplateRules = new HashMap<>();
private SequenceType requiredType = SequenceType.ANY_SEQUENCE;
private boolean declaresRequiredType = false;
private boolean hasRequiredParams = false;
private boolean isTailRecursive = false;
private Visibility visibility = Visibility.PRIVATE;
private ItemType requiredContextItemType = AnyItemType.getInstance();
private boolean mayOmitContextItem = true;
//private boolean maySupplyContextItem = true;
private boolean absentFocus = false;
private boolean jitCompilationDone = false;
private boolean explaining;
//private Expression body;
/**
* Get the corresponding NamedTemplate object that results from the compilation of this
* StylesheetComponent
*/
@Override
public NamedTemplate getActor() {
return compiledNamedTemplate;
}
// public Expression getBody() {
// return body;
// }
@Override
public void setCompilation(Compilation compilation) {
super.setCompilation(compilation);
//compiledNamedTemplate.setPackageData(compilation.getPackageData());
}
/**
* Ask whether this node is a declaration, that is, a permitted child of xsl:stylesheet
* (including xsl:include and xsl:import).
*
* @return true for this element
*/
@Override
public boolean isDeclaration() {
return true;
}
/**
* Ask whether the compilation of the template should be deferred
*
* @param compilation the compilation
* @return true if compilation should be deferred
*/
public boolean isDeferredCompilation(Compilation compilation) {
return compilation.isPreScan() && getTemplateName() == null && !compilation.isLibraryPackage();
}
/**
* Determine whether this type of element is allowed to contain a template-body
*
* @return true: yes, it may contain a template-body
*/
@Override
protected boolean mayContainSequenceConstructor() {
return true;
}
@Override
protected boolean mayContainParam() {
return true;
}
@Override
protected boolean isWithinDeclaredStreamableConstruct() {
try {
for (Mode m : getApplicableModes()) {
if (m.isDeclaredStreamable()) {
return true;
}
}
} catch (XPathException e) {
return false;
}
return false;
}
/**
* Set the required context item type. Used when there is an xsl:context-item child element
*
* @param type the required context item type
* @param mayBeOmitted true if the context item may be absent
* @param absentFocus true if use=absent is specified
*/
public void setContextItemRequirements(ItemType type, boolean mayBeOmitted, boolean absentFocus) {
requiredContextItemType = type;
mayOmitContextItem = mayBeOmitted;
this.absentFocus = absentFocus;
}
/**
* Specify that xsl:param and xsl:context-item are permitted children
*/
@Override
protected boolean isPermittedChild(StyleElement child) {
return child instanceof XSLLocalParam || child.getFingerprint() == StandardNames.XSL_CONTEXT_ITEM;
}
/**
* Return the name of this template. Note that this may
* be called before prepareAttributes has been called.
*
* @return the name of the template as a Structured QName.
*/
/*@Nullable*/
public StructuredQName getTemplateName() {
if (getObjectName() == null) {
// allow for forwards references
String nameAtt = getAttributeValue("", "name");
if (nameAtt != null) {
setObjectName(makeQName(nameAtt, null, "name"));
}
}
return getObjectName();
}
@Override
public SymbolicName getSymbolicName() {
if (getTemplateName() == null) {
return null;
} else {
return new SymbolicName(StandardNames.XSL_TEMPLATE, getTemplateName());
}
}
public ItemType getRequiredContextItemType() {
return requiredContextItemType;
}
public boolean isMayOmitContextItem() {
return mayOmitContextItem;
}
@Override
public void checkCompatibility(Component component) {
NamedTemplate other = (NamedTemplate) component.getActor();
if (!getSymbolicName().equals(other.getSymbolicName())) {
throw new IllegalArgumentException();
}
SequenceType req = requiredType == null ? SequenceType.ANY_SEQUENCE : requiredType;
if (!req.equals(other.getRequiredType())) {
compileError("The overriding template has a different required type from the overridden template", "XTSE3070");
return;
}
if (!requiredContextItemType.equals(other.getRequiredContextItemType()) ||
mayOmitContextItem != other.isMayOmitContextItem() ||
absentFocus != other.isAbsentFocus()) {
compileError("The required context item for the overriding template differs from that of the overridden template", "XTSE3070");
return;
}
List otherParams = other.getLocalParamDetails();
Set overriddenParams = new HashSet<>();
for (NamedTemplate.LocalParamInfo lp0 : otherParams) {
XSLLocalParam lp1 = getParam(lp0.name);
if (lp1 == null) {
if (!lp0.isTunnel) {
compileError("The overridden template declares a parameter " +
lp0.name.getDisplayName() + " which is not declared in the overriding template", "XTSE3070");
}
return;
}
if (!lp1.getRequiredType().equals(lp0.requiredType)) {
lp1.compileError("The parameter " +
lp0.name.getDisplayName() + " has a different required type in the overridden template", "XTSE3070");
return;
}
if (lp1.isRequiredParam() != lp0.isRequired && !lp0.isTunnel) {
lp1.compileError("The parameter " +
lp0.name.getDisplayName() + " is " +
(lp1.isRequiredParam() ? "required" : "optional") +
" in the overriding template, but " +
(lp0.isRequired ? "required" : "optional") +
" in the overridden template", "XTSE3070");
return;
}
if (lp1.isTunnelParam() != lp0.isTunnel) {
lp1.compileError("The parameter " +
lp0.name.getDisplayName() + " is a " +
(lp1.isTunnelParam() ? "tunnel" : "non-tunnel") +
" parameter in the overriding template, but " +
(lp0.isTunnel ? "tunnel" : "non-tunnel") +
" parameter in the overridden template", "XTSE3070");
return;
}
overriddenParams.add(lp0.name);
}
for (NodeInfo param : children(XSLLocalParam.class::isInstance)) {
if (!overriddenParams.contains(((XSLLocalParam) param).getObjectName()) &&
((XSLLocalParam) param).isRequiredParam()) {
((XSLLocalParam) param).compileError(
"An overriding template cannot introduce a required parameter that is not declared in the overridden template", "XTSE3070");
}
}
}
public XSLLocalParam getParam(StructuredQName name) {
for (NodeInfo param : children(XSLLocalParam.class::isInstance)) {
if (name.equals(((XSLLocalParam) param).getObjectName())) {
return (XSLLocalParam) param;
}
}
return null;
}
@Override
protected void prepareAttributes() {
AttributeMap atts = attributes();
String extraAsAtt = null;
for (AttributeInfo att : atts) {
NodeName name = att.getNodeName();
String f = name.getDisplayName();
if (f.equals("mode")) {
modeAtt = Whitespace.trim(att.getValue());
} else if (f.equals("name")) {
nameAtt = Whitespace.trim(att.getValue());
} else if (f.equals("match")) {
matchAtt = att.getValue();
} else if (f.equals("priority")) {
priorityAtt = Whitespace.trim(att.getValue());
} else if (f.equals("as")) {
asAtt = att.getValue();
} else if (f.equals("visibility")) {
visibilityAtt = Whitespace.trim(att.getValue());
} else if (name.hasURI(NamespaceConstant.SAXON)) {
isExtensionAttributeAllowed(name.getDisplayName());
if (name.getLocalPart().equals("as")) {
extraAsAtt = att.getValue();
} else if (name.getLocalPart().equals("explain")) {
explaining = isYes(Whitespace.trim(att.getValue()));
}
} else {
checkUnknownAttribute(name);
}
}
try {
if (modeAtt == null) {
if (matchAtt != null) {
// XSLT 3.0 allows the default mode to be specified on any element
StructuredQName defaultMode = getDefaultMode();
if (defaultMode == null) {
defaultMode = Mode.UNNAMED_MODE_NAME;
}
modeNames = new StructuredQName[1];
modeNames[0] = defaultMode;
}
} else {
if (matchAtt == null) {
compileError("The mode attribute must be absent if the match attribute is absent", "XTSE0500");
}
getModeNames();
}
} catch (XPathException err) {
err.maybeSetErrorCode("XTSE0280");
if (err.getErrorCodeLocalPart().equals("XTSE0020")) {
err.setErrorCode("XTSE0550");
}
err.setIsStaticError(true);
compileError(err);
}
if (nameAtt != null) {
if (getObjectName() == null) {
StructuredQName qName = makeQName(nameAtt, "XTSE0280", "name");
setObjectName(qName);
}
if (compiledNamedTemplate != null) {
compiledNamedTemplate.setTemplateName(getObjectName());
}
diagnosticId = nameAtt;
}
prioritySpecified = priorityAtt != null;
if (prioritySpecified) {
if (matchAtt == null) {
compileError("The priority attribute must be absent if the match attribute is absent", "XTSE0500");
}
try {
// it's got to be a valid decimal, but we want it as a double, so parse it twice
if (!BigDecimalValue.castableAsDecimal(priorityAtt)) {
compileError("Invalid numeric value for priority (" + priority + ')', "XTSE0530");
}
priority = Double.parseDouble(priorityAtt);
} catch (NumberFormatException err) {
// shouldn't happen
compileError("Invalid numeric value for priority (" + priority + ')', "XTSE0530");
}
}
if (matchAtt != null) {
match = makePattern(matchAtt, "match");
if (diagnosticId == null) {
diagnosticId = "match=\"" + matchAtt + '\"';
if (modeAtt != null) {
diagnosticId += " mode=\"" + modeAtt + '\"';
}
}
}
if (match == null && nameAtt == null) {
compileError("xsl:template must have a name or match attribute (or both)", "XTSE0500");
}
if (asAtt != null) {
try {
requiredType = makeSequenceType(asAtt);
declaresRequiredType = true;
} catch (XPathException e) {
compileErrorInAttribute(e.getMessage(), e.getErrorCodeLocalPart(), "as");
}
}
if (extraAsAtt != null) {
SequenceType extraResultType;
declaresRequiredType = true;
try {
extraResultType = makeExtendedSequenceType(extraAsAtt);
} catch (XPathException e) {
compileErrorInAttribute(e.getMessage(), e.getErrorCodeLocalPart(), "saxon:as");
extraResultType = requiredType; // error recovery
}
if (asAtt != null) {
Affinity rel = getConfiguration().getTypeHierarchy().sequenceTypeRelationship(extraResultType, requiredType);
if (rel == Affinity.SAME_TYPE || rel == Affinity.SUBSUMED_BY) {
requiredType = extraResultType;
} else {
compileErrorInAttribute("When both are present, @saxon:as must be a subtype of @as", "SXER7TBA", "saxon:as");
}
} else {
requiredType = extraResultType;
}
}
if (visibilityAtt != null) {
visibility = interpretVisibilityValue(visibilityAtt, "");
if (nameAtt == null) {
compileError("xsl:template/@visibility can be specified only if the template has a @name attribute", "XTSE0020");
} else {
compiledNamedTemplate.setDeclaredVisibility(getVisibility());
}
}
}
@Override
public void processAllAttributes() throws XPathException {
// String mode = getAttributeValue("mode");
// mode = mode == null ? "" : Whitespace.trim(mode);
if (!isDeferredCompilation(getCompilation())) {
super.processAllAttributes(); //TODO - sort out the duplicated code. This repeats the code below
} else {
processDefaultCollationAttribute();
processDefaultMode();
staticContext = new ExpressionContext(this, null);
processAttributes();
}
}
/**
* Return the list of mode names to which this template rule is applicable.
*
* @return the list of mode names. If the mode attribute is absent, #default is assumed.
* If #default is present explicitly or implicitly, it is replaced by the default mode, taken
* from the in-scope default-modes attribute, which defaults to #unnamed. The unnamed mode
* is represented by {@link Mode#UNNAMED_MODE_NAME}. The token #all translates to
* {@link Mode#OMNI_MODE}.
* @throws XPathException if the attribute is invalid.
*/
public StructuredQName[] getModeNames() throws XPathException {
if (modeNames == null) {
// modeAtt is a space-separated list of mode names, or "#default", or "#all"
if (modeAtt == null) {
modeAtt = getAttributeValue("mode");
if (modeAtt == null) {
modeAtt = "#default";
}
}
boolean allModes = false;
String[] tokens = Whitespace.trim(modeAtt).split("[ \t\n\r]+");
int count = tokens.length;
modeNames = new StructuredQName[count];
count = 0;
for (String s : tokens) {
StructuredQName mname;
if ("#default".equals(s)) {
mname = getDefaultMode();
if (mname == null) {
mname = Mode.UNNAMED_MODE_NAME;
}
} else if ("#unnamed".equals(s)) {
mname = Mode.UNNAMED_MODE_NAME;
} else if ("#all".equals(s)) {
allModes = true;
mname = Mode.OMNI_MODE;
} else {
mname = makeQName(s, "XTSE0550", "mode");
}
for (int e = 0; e < count; e++) {
if (modeNames[e].equals(mname)) {
compileError("In the list of modes, the value " + s + " is duplicated", "XTSE0550");
}
}
modeNames[count++] = mname;
}
if (allModes && (count > 1)) {
compileError("mode='#all' cannot be combined with other modes", "XTSE0550");
}
}
return modeNames;
}
/**
* Get the modes to which this template rule applies
*
* @return the set of modes to which it applies
* @throws XPathException should not happen
*/
public Set getApplicableModes() throws XPathException {
StructuredQName[] names = getModeNames();
Set modes = new HashSet<>(names.length);
RuleManager mgr = getPrincipalStylesheetModule().getRuleManager();
for (StructuredQName name : names) {
if (name.equals(Mode.OMNI_MODE)) {
modes.add(mgr.getUnnamedMode());
modes.addAll(mgr.getAllNamedModes());
} else {
Mode mode = mgr.obtainMode(name, false);
if (mode != null) {
modes.add(mode);
}
}
}
return modes;
}
/**
* Ask whether this is a template rule with mode="#all"
* @return true if this is the case
* @throws XPathException if the mode attribute is found to be invalid
*/
public boolean isOmniMode() throws XPathException {
for (StructuredQName name : getModeNames()) {
if (name.equals(Mode.OMNI_MODE)) {
return true;
}
}
return false;
}
@Override
public void validate(ComponentDeclaration decl) throws XPathException {
stackFrameMap = getConfiguration().makeSlotManager();
checkTopLevel("XTSE0010", true);
// the check for duplicates is now done in the buildIndexes() method of XSLStylesheet
if (match != null) {
match = typeCheck("match", match);
if (match.getItemType() instanceof ErrorType) {
issueWarning(new XPathException("Pattern will never match anything", SaxonErrorCode.SXWN9015, this));
}
if (getPrincipalStylesheetModule().isDeclaredModes()) {
RuleManager manager = getPrincipalStylesheetModule().getRuleManager();
if (modeNames != null) {
for (StructuredQName name : modeNames) {
if (name.equals(Mode.UNNAMED_MODE_NAME) && !manager.isUnnamedModeExplicit()) {
compileError("The unnamed mode has not been declared in an xsl:mode declaration", "XTSE3085");
}
if (manager.obtainMode(name, false) == null) {
compileError("Mode name " + name.getDisplayName() + " has not been declared in an xsl:mode declaration", "XTSE3085");
}
}
} else {
if (!manager.isUnnamedModeExplicit()) {
compileError("The unnamed mode has not been declared in an xsl:mode declaration", "XTSE3085");
}
}
}
if (visibility == Visibility.ABSTRACT) {
compileError("An abstract template must have no match attribute");
}
}
// See if there are any required parameters.
boolean hasContent = false;
for (NodeInfo param : children(StyleElement.class::isInstance)) {
if (param.getFingerprint() == StandardNames.XSL_CONTEXT_ITEM) {
// no action
} else if (param instanceof XSLLocalParam) {
if (((XSLLocalParam) param).isRequiredParam()) {
hasRequiredParams = true;
}
} else {
hasContent = true;
}
}
if (visibility == Visibility.ABSTRACT && hasContent) {
compileError("A template with visibility='abstract' must have no body");
}
}
@Override
public void validateSubtree(ComponentDeclaration decl, boolean excludeStylesheet) throws XPathException {
if (!isDeferredCompilation(getCompilation())) {
super.validateSubtree(decl, excludeStylesheet);
} else {
try {
validate(decl);
} catch (XPathException err) {
compileError(err);
}
}
}
@Override
public void index(ComponentDeclaration decl, PrincipalStylesheetModule top) throws XPathException {
if (getTemplateName() != null) {
if (compiledNamedTemplate == null) {
compiledNamedTemplate = new NamedTemplate(getTemplateName());
}
top.indexNamedTemplate(decl);
}
}
/**
* Mark tail-recursive calls on templates and functions.
*/
@Override
protected boolean markTailCalls() {
StyleElement last = getLastChildInstruction();
return last != null && last.markTailCalls();
}
/**
* Compile: creates the executable form of the template
*/
@Override
public void compileDeclaration(Compilation compilation, ComponentDeclaration decl) throws XPathException {
if (isDeferredCompilation(compilation)) {
createSkeletonTemplate(compilation, decl);
//System.err.println("Deferred - " + ++lazy);
return;
}
if (compilation.getCompilerInfo().getOptimizerOptions().isSet(OptimizerOptions.TAIL_CALLS)) {
isTailRecursive = markTailCalls();
}
Expression body = compileSequenceConstructor(compilation, decl, true);
body.restoreParentPointers();
RetainedStaticContext rsc = makeRetainedStaticContext();
if (body.getRetainedStaticContext() == null) {
body.setRetainedStaticContext(rsc); // bug 2608
}
if (match != null && compilation.getConfiguration().getBooleanProperty(Feature.STRICT_STREAMABILITY) &&
isWithinDeclaredStreamableConstruct()) {
checkStrictStreamability(body);
}
if (getTemplateName() != null) {
compileNamedTemplate(compilation, body, decl);
}
if (match != null) {
//System.err.println("Rules compiled - " + ++eager);
compileTemplateRule(compilation, body, decl);
}
}
private void checkStrictStreamability(Expression body) throws XPathException {
getConfiguration().checkStrictStreamability(this, body);
}
private void compileNamedTemplate(Compilation compilation, Expression body, ComponentDeclaration decl) throws XPathException {
RetainedStaticContext rsc = body.getRetainedStaticContext();
compiledNamedTemplate.setPackageData(rsc.getPackageData());
compiledNamedTemplate.setBody(body);
compiledNamedTemplate.setStackFrameMap(stackFrameMap);
compiledNamedTemplate.setSystemId(getSystemId());
compiledNamedTemplate.setLineNumber(getLineNumber());
compiledNamedTemplate.setColumnNumber(getColumnNumber());
compiledNamedTemplate.setHasRequiredParams(hasRequiredParams);
compiledNamedTemplate.setRequiredType(requiredType);
compiledNamedTemplate.setContextItemRequirements(requiredContextItemType, mayOmitContextItem, absentFocus);
compiledNamedTemplate.setRetainedStaticContext(rsc);
compiledNamedTemplate.setDeclaredVisibility(getDeclaredVisibility());
Component overridden = getOverriddenComponent();
if (overridden != null) {
checkCompatibility(overridden);
}
ContextItemStaticInfo cisi = getConfiguration().makeContextItemStaticInfo(requiredContextItemType, mayOmitContextItem);
Expression body2 = refineTemplateBody(body, cisi);
compiledNamedTemplate.setBody(body2);
if (getCompilation().getCompilerInfo().getCodeInjector() != null) {
getCompilation().getCompilerInfo().getCodeInjector().process(compiledNamedTemplate);
}
}
private Expression refineTemplateBody(Expression body, ContextItemStaticInfo cisi) {
Expression old = body;
try {
body = body.simplify();
} catch (XPathException e) {
if (e.isReportableStatically()) {
compileError(e);
} else {
body = new ErrorExpression(new XmlProcessingException(e));
ExpressionTool.copyLocationInfo(old, body);
}
}
Configuration config = getConfiguration();
if (visibility != Visibility.ABSTRACT) {
try {
if (requiredType != null && requiredType != SequenceType.ANY_SEQUENCE) {
RoleDiagnostic role =
new RoleDiagnostic(RoleDiagnostic.TEMPLATE_RESULT, diagnosticId, 0);
role.setErrorCode("XTTE0505");
body = config.getTypeChecker(false).staticTypeCheck(body, requiredType, role, makeExpressionVisitor());
}
} catch (XPathException err) {
if (err.isReportableStatically()) {
compileError(err);
}
body = new ErrorExpression(new XmlProcessingException(err));
ExpressionTool.copyLocationInfo(old, body);
}
}
try {
ExpressionVisitor visitor = makeExpressionVisitor();
body = body.typeCheck(visitor, cisi);
} catch (XPathException e) {
compileError(e);
}
return body;
}
public void compileTemplateRule(Compilation compilation, Expression body, ComponentDeclaration decl) {
Configuration config = getConfiguration();
if (getTemplateName() != null) {
body = body.copy(new RebindingMap());
}
ItemType contextItemType;
ContextItemStaticInfo cisi;
// the template can't be called by name, so the context item must match the match pattern
contextItemType = match.getItemType();
if (contextItemType.equals(ErrorType.getInstance())) {
// if the match pattern can't match anything, we produce a warning, not a hard error
contextItemType = AnyItemType.getInstance();
}
cisi = config.makeContextItemStaticInfo(contextItemType, false);
body = refineTemplateBody(body, cisi);
boolean first = true;
for (Map.Entry kvp : compiledTemplateRules.entrySet()) {
if (!kvp.getKey().equals(Mode.OMNI_MODE)) {
TemplateRule rule = kvp.getValue();
if (first) {
rule.setMatchPattern(match);
rule.setBody(body);
if (compilation.getCompilerInfo().getCodeInjector() != null) {
compilation.getCompilerInfo().getCodeInjector().process(rule);
body = rule.getBody();
}
first = false;
} else {
if (rule.getBody() == null) {
body = body.copy(new RebindingMap());
} else {
body = rule.getBody();
}
}
setCompiledTemplateRuleProperties(rule, body);
rule.updateSlaveCopies();
}
}
// following code needed only for diagnostics
//body.verifyParentPointers();
}
private void createSkeletonTemplate(Compilation compilation, ComponentDeclaration decl) throws XPathException {
StructuredQName[] modes = modeNames;
if (isOmniMode()) {
List all = new ArrayList<>();
all.add(Mode.UNNAMED_MODE_NAME);
RuleManager mgr = getCompilation().getPrincipalStylesheetModule().getRuleManager();
for (Mode m : mgr.getAllNamedModes()) {
all.add(m.getModeName());
}
modes = all.toArray(new StructuredQName[0]);
}
for (StructuredQName modeName : modes) {
TemplateRule templateRule = compiledTemplateRules.get(modeName);
if (templateRule == null) {
templateRule = getConfiguration().makeTemplateRule();
}
templateRule.prepareInitializer(compilation, decl, modeName);
compiledTemplateRules.put(modeName, templateRule);
RetainedStaticContext rsc = makeRetainedStaticContext();
templateRule.setPackageData(rsc.getPackageData());
setCompiledTemplateRuleProperties(templateRule, null);
}
}
private void setCompiledTemplateRuleProperties(TemplateRule templateRule, Expression body) {
templateRule.setMatchPattern(match);
templateRule.setBody(body);
templateRule.setStackFrameMap(stackFrameMap);
templateRule.setSystemId(getSystemId());
templateRule.setLineNumber(getLineNumber());
templateRule.setColumnNumber(getColumnNumber());
templateRule.setHasRequiredParams(hasRequiredParams);
templateRule.setRequiredType(requiredType);
templateRule.setContextItemRequirements(requiredContextItemType, absentFocus);
}
/**
* Code executed when the template is first executed under JIT. If the template is defined in several
* modes, then this may be called several times, but it only does anything the first time. Mode-specific
* processing is done in the TemplateRuleInitializer.
*
* @param compilation the compilation episode
* @param decl the template rule declaration
* @throws XPathException if anything goes wrong
*/
public synchronized void jitCompile(Compilation compilation, ComponentDeclaration decl) throws XPathException {
if (!jitCompilationDone) {
jitCompilationDone = true;
compilation.setPreScan(false);
processAllAttributes();
checkForJitCompilationErrors(compilation);
validateSubtree(decl, false);
checkForJitCompilationErrors(compilation);
compileDeclaration(compilation, decl);
checkForJitCompilationErrors(compilation);
}
}
private void checkForJitCompilationErrors(Compilation compilation) throws XPathException {
if (compilation.getErrorCount() > 0) {
XPathException e = new XPathException("Errors were reported during JIT compilation of template rule with match=\"" + matchAtt + "\"",
SaxonErrorCode.SXST0001, this);
e.setHasBeenReported(true); // only intended as an exception message, not something to report to ErrorListener
throw e;
}
}
/**
* Registers the template rule with each Mode that it belongs to.
*
* @param declaration Associates this template with a stylesheet module (in principle an xsl:template
* element can be in a document that is imported more than once; these are separate declarations)
* @throws XPathException if a failure occurs
*/
public void register(ComponentDeclaration declaration) throws XPathException {
if (match != null) {
StylesheetModule module = declaration.getModule();
RuleManager mgr = getCompilation().getPrincipalStylesheetModule().getRuleManager();
ExpressionVisitor visitor = ExpressionVisitor.make(getStaticContext());
for (StructuredQName modeName : getModeNames()) {
Mode mode = mgr.obtainMode(modeName, false);
if (mode == null) {
if (mgr.existsOmniMode()) {
Mode omniMode = mgr.obtainMode(Mode.OMNI_MODE, true);
mode = mgr.obtainMode(modeName, true);
SimpleMode.copyRules(omniMode.getActivePart(), mode.getActivePart());
} else {
mode = mgr.obtainMode(modeName, true);
}
} else {
boolean ok = getPrincipalStylesheetModule().checkAcceptableModeForPackage(this, mode);
if (!ok) {
return;
}
}
Pattern match1 = match.copy(new RebindingMap());
String typed = mode.getActivePart().getPropertyValue("typed");
if ("strict".equals(typed) || "lax".equals(typed)) {
Pattern match2;
try {
match2 = match1.convertToTypedPattern(typed);
} catch (XPathException e) {
e.maybeSetLocation(this);
throw e;
}
if (match2 != match1) {
ContextItemStaticInfo info = getConfiguration().makeContextItemStaticInfo(AnyItemType.getInstance(), false);
ExpressionTool.copyLocationInfo(match, match2);
match2.setOriginalText(match.toString());
match2 = match2.typeCheck(visitor, info);
match1 = match2;
}
if (modeNames.length == 1) {
// If this is the only mode for the template, then we can use this enhanced match pattern
// for subsequent type-checking of the template body.
// TODO: we can now do this for all modes...
// TODO: but we need to take account of mode=#all, where modeNames.length==1
match = match2;
}
}
TemplateRule rule = compiledTemplateRules.get(modeName);
if (rule == null) {
rule = getConfiguration().makeTemplateRule();
compiledTemplateRules.put(modeName, rule);
}
double prio = prioritySpecified ? priority : Double.NaN;
mgr.registerRule(match1, rule, mode, module, prio, mgr.allocateSequenceNumber(), 0);
if (mode.isDeclaredStreamable()) {
rule.setDeclaredStreamable(true);
if (!match1.isMotionless()) {
boolean fallback = getConfiguration().getBooleanProperty(Feature.STREAMING_FALLBACK);
String message = "Template rule is declared streamable but the match pattern is not motionless";
if (fallback) {
message += "\n * Falling back to non-streaming implementation";
getStaticContext().issueWarning(message, this);
rule.setDeclaredStreamable(false);
getCompilation().setFallbackToNonStreaming(true);
} else {
throw new XPathException(message, "XTSE3430", this);
}
}
}
if (mode.getDefaultResultType() != null && !declaresRequiredType) {
rule.setRequiredType(mode.getDefaultResultType());
}
// if adding a rule to the omniMode (mode='all') add it to all
// the other modes as well. For all but the first, it needs to
// be copied because the external component bindings might
// differ from one mode to another.
if (mode.getModeName().equals(Mode.OMNI_MODE)) {
compiledTemplateRules.put(Mode.UNNAMED_MODE_NAME, rule);
mgr.registerRule(match1, rule, mgr.getUnnamedMode(), module, prio, mgr.allocateSequenceNumber(), 0);
for (Mode m : mgr.getAllNamedModes()) {
if (m instanceof SimpleMode) {
TemplateRule ruleCopy = rule.copy();
if (m.isDeclaredStreamable()) {
ruleCopy.setDeclaredStreamable(true);
}
compiledTemplateRules.put(m.getModeName(), ruleCopy);
mgr.registerRule(match1.copy(new RebindingMap()),
ruleCopy, m, module, prio, mgr.allocateSequenceNumber(), 0);
}
}
}
}
}
}
/**
* Allocate slot numbers to any local variables declared within a predicate within the match pattern
*/
public void allocatePatternSlotNumbers() {
if (match != null) {
for (TemplateRule templateRule : compiledTemplateRules.values()) {
for (Rule r : templateRule.getRules()) {
// In the case of a union pattern, allocate slots separately for each branch
Pattern match = r.getPattern();
// first slot in pattern is reserved for current()
int nextFree = 0;
if ((match.getDependencies() & StaticProperty.DEPENDS_ON_CURRENT_ITEM) != 0) {
nextFree = 1;
}
int slots = match.allocateSlots(getSlotManager(), nextFree);
// if the pattern calls user-defined functions, allocate at least one slot,
// to force a new context to be created for evaluating patterns (bug 3706)
if (slots == 0 && ((match.getDependencies() & StaticProperty.DEPENDS_ON_USER_FUNCTIONS) != 0)) {
slots = 1;
}
if (slots > 0) {
RuleManager mgr = getCompilation().getPrincipalStylesheetModule().getRuleManager();
boolean appliesToAll = false;
for (StructuredQName nc : modeNames) {
if (nc.equals(Mode.OMNI_MODE)) {
appliesToAll = true;
break;
}
Mode mode = mgr.obtainMode(nc, true);
mode.getActivePart().allocatePatternSlots(slots);
}
if (appliesToAll) {
for (Mode m : mgr.getAllNamedModes()) {
m.getActivePart().allocatePatternSlots(slots);
}
mgr.getUnnamedMode().getActivePart().allocatePatternSlots(slots);
}
}
}
}
}
}
/**
* This method is a bit of a misnomer, because it does more than invoke optimization of the template body.
* In particular, it also registers the template rule with each Mode that it belongs to.
*
* @param declaration Associates this template with a stylesheet module (in principle an xsl:template
* element can be in a document that is imported more than once; these are separate declarations)
* @throws XPathException if errors are found
*/
@Override
public void optimize(ComponentDeclaration declaration) throws XPathException {
Configuration config = getConfiguration();
if (compiledNamedTemplate != null) {
Expression body = compiledNamedTemplate.getBody();
ContextItemStaticInfo cisi = getConfiguration().makeContextItemStaticInfo(requiredContextItemType, mayOmitContextItem);
ExpressionVisitor visitor = makeExpressionVisitor();
body = body.typeCheck(visitor, cisi);
body = ExpressionTool.optimizeComponentBody(body, getCompilation(), visitor, cisi, true);
compiledNamedTemplate.setBody(body);
allocateLocalSlots(body);
if (explaining) {
Logger err = getConfiguration().getLogger();
err.info("Optimized expression tree for named template at line " +
getLineNumber() + " in " + getSystemId() + ':');
body.explain(err);
}
body.restoreParentPointers();
if (config.isDeferredByteCode(HostLanguage.XSLT) && !isTailRecursive) {
Optimizer opt = config.obtainOptimizer();
int evaluationModes = Expression.ITERATE_METHOD | Expression.PROCESS_METHOD;
compiledNamedTemplate.setBody(opt.makeByteCodeCandidate(compiledNamedTemplate, body, diagnosticId, evaluationModes));
}
}
if (match != null) {
ItemType contextItemType = getContextItemTypeForTemplateRule();
ContextItemStaticInfo cisi = config.makeContextItemStaticInfo(contextItemType, false);
cisi.setContextPostureStriding();
ExpressionVisitor visitor = makeExpressionVisitor();
match.resetLocalStaticProperties();
match = match.optimize(visitor, cisi);
if (!isDeferredCompilation(getCompilation())) {
Optimizer opt = getConfiguration().obtainOptimizer();
try {
for (Map.Entry entry : compiledTemplateRules.entrySet()) {
if (!entry.getKey().equals(Mode.OMNI_MODE)) {
TemplateRule compiledTemplateRule = entry.getValue();
Expression templateRuleBody = compiledTemplateRule.getBody();
visitor.setOptimizeForStreaming(compiledTemplateRule.isDeclaredStreamable());
templateRuleBody = templateRuleBody.typeCheck(visitor, cisi);
templateRuleBody = ExpressionTool.optimizeComponentBody(templateRuleBody, getCompilation(), visitor, cisi, true);
compiledTemplateRule.setBody(templateRuleBody);
opt.checkStreamability(this, compiledTemplateRule);
allocateLocalSlots(templateRuleBody);
for (Rule r : compiledTemplateRule.getRules()) {
Pattern match = r.getPattern();
ContextItemStaticInfo info = getConfiguration().makeContextItemStaticInfo(match.getItemType(), false);
info.setContextPostureStriding();
Pattern m2 = match.optimize(visitor, info);
if (compiledTemplateRules.size() > 1) {
m2 = m2.copy(new RebindingMap());
}
if (m2 != match) {
r.setPattern(m2);
}
}
if (visitor.getConfiguration().isDeferredByteCode(HostLanguage.XSLT) && !isTailRecursive) {
int evaluationModes = Expression.ITERATE_METHOD | Expression.PROCESS_METHOD;
compiledTemplateRule.setBody(opt.makeByteCodeCandidate(compiledTemplateRule, templateRuleBody, diagnosticId, evaluationModes));
}
if (explaining) {
Logger err = getConfiguration().getLogger();
err.info("Optimized expression tree for template rule at line " +
getLineNumber() + " in " + getSystemId() + ':');
templateRuleBody.explain(err);
}
}
}
} catch (XPathException e) {
e.maybeSetLocation(this);
compileError(e);
}
}
}
}
public ItemType getContextItemTypeForTemplateRule() throws XPathException {
Configuration config = getConfiguration();
ItemType contextItemType = match.getItemType();
if (contextItemType.equals(ErrorType.getInstance())) {
// if the match pattern can't match anything, we produce a warning, not a hard error
contextItemType = AnyItemType.getInstance();
}
if (requiredContextItemType != AnyItemType.getInstance()) {
Affinity rel = config.getTypeHierarchy().relationship(contextItemType, requiredContextItemType);
switch (rel) {
case DISJOINT:
XPathException e = new XPathException("The declared context item type is inconsistent with the match pattern", "XPTY0004", this);
e.setIsTypeError(true);
throw e;
case SUBSUMED_BY:
case OVERLAPS:
case SAME_TYPE:
// no action
break;
case SUBSUMES:
contextItemType = requiredContextItemType;
break;
}
}
return contextItemType;
}
/**
* Generate byte code for the template (if appropriate)
*
* @param opt the optimizer
* @throws XPathException if byte code generation fails
*/
@Override
public void generateByteCode(Optimizer opt) throws XPathException {
// Generate byte code if appropriate
}
/**
* Get associated Procedure (for details of stack frame)
*/
@Override
public SlotManager getSlotManager() {
return stackFrameMap;
}
/**
* Get the compiled template
*
* @return the compiled template
*/
public NamedTemplate getCompiledNamedTemplate() {
return compiledNamedTemplate;
}
public Pattern getMatch() {
return match;
}
public Map getTemplateRulesByMode() {
return compiledTemplateRules;
}
}