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lux.compiler.SaxonTranslator Maven / Gradle / Ivy
package lux.compiler;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import lux.exception.LuxException;
import lux.xml.QName;
import lux.xml.ValueType;
import lux.xpath.AbstractExpression;
import lux.xpath.BinaryOperation;
import lux.xpath.BinaryOperation.Operator;
import lux.xpath.Dot;
import lux.xpath.FunCall;
import lux.xpath.LiteralExpression;
import lux.xpath.Namespace;
import lux.xpath.PathExpression;
import lux.xpath.PathStep;
import lux.xpath.Predicate;
import lux.xpath.Root;
import lux.xpath.Sequence;
import lux.xpath.Subsequence;
import lux.xpath.UnaryMinus;
import lux.xquery.AttributeConstructor;
import lux.xquery.CommentConstructor;
import lux.xquery.ComputedElementConstructor;
import lux.xquery.Conditional;
import lux.xquery.DocumentConstructor;
import lux.xquery.ElementConstructor;
import lux.xquery.FLWOR;
import lux.xquery.FLWORClause;
import lux.xquery.ForClause;
import lux.xquery.FunctionDefinition;
import lux.xquery.InstanceOf;
import lux.xquery.LetClause;
import lux.xquery.ModuleImport;
import lux.xquery.OrderByClause;
import lux.xquery.ProcessingInstructionConstructor;
import lux.xquery.Satisfies;
import lux.xquery.Satisfies.Quantifier;
import lux.xquery.SortKey;
import lux.xquery.TextConstructor;
import lux.xquery.Variable;
import lux.xquery.VariableDefinition;
import lux.xquery.WhereClause;
import lux.xquery.XQuery;
import net.sf.saxon.Configuration;
import net.sf.saxon.expr.*;
import net.sf.saxon.expr.flwor.Clause;
import net.sf.saxon.expr.flwor.FLWORExpression;
import net.sf.saxon.expr.flwor.LocalVariableBinding;
import net.sf.saxon.expr.instruct.Block;
import net.sf.saxon.expr.instruct.Choose;
import net.sf.saxon.expr.instruct.Comment;
import net.sf.saxon.expr.instruct.ComputedAttribute;
import net.sf.saxon.expr.instruct.ComputedElement;
import net.sf.saxon.expr.instruct.CopyOf;
import net.sf.saxon.expr.instruct.DocumentInstr;
import net.sf.saxon.expr.instruct.FixedAttribute;
import net.sf.saxon.expr.instruct.FixedElement;
import net.sf.saxon.expr.instruct.GlobalVariable;
import net.sf.saxon.expr.instruct.ProcessingInstruction;
import net.sf.saxon.expr.instruct.UserFunctionParameter;
import net.sf.saxon.expr.instruct.ValueOf;
import net.sf.saxon.expr.parser.Token;
import net.sf.saxon.expr.sort.DocumentSorter;
import net.sf.saxon.expr.sort.SortKeyDefinition;
import net.sf.saxon.functions.StandardFunction;
import net.sf.saxon.functions.StandardFunction.Entry;
import net.sf.saxon.lib.FeatureKeys;
import net.sf.saxon.lib.NamespaceConstant;
import net.sf.saxon.om.*;
import net.sf.saxon.pattern.CombinedNodeTest;
import net.sf.saxon.pattern.DocumentNodeTest;
import net.sf.saxon.pattern.LocalNameTest;
import net.sf.saxon.pattern.NameTest;
import net.sf.saxon.pattern.NamespaceTest;
import net.sf.saxon.pattern.NodeTest;
import net.sf.saxon.query.QueryModule;
import net.sf.saxon.query.XQueryExpression;
import net.sf.saxon.query.XQueryFunction;
import net.sf.saxon.s9api.XQueryExecutable;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.type.AtomicType;
import net.sf.saxon.type.BuiltInAtomicType;
import net.sf.saxon.type.ErrorType;
import net.sf.saxon.type.ItemType;
import net.sf.saxon.type.Type;
import net.sf.saxon.value.AtomicValue;
import net.sf.saxon.value.BigIntegerValue;
import net.sf.saxon.value.CalendarValue;
import net.sf.saxon.value.Cardinality;
import net.sf.saxon.value.DurationValue;
import net.sf.saxon.value.QNameValue;
import net.sf.saxon.value.SequenceType;
import net.sf.saxon.z.IntSet;
import net.sf.saxon.z.IntUniversalSet;
import org.apache.commons.lang.StringUtils;
/*
TODO: AdjacentTextNodeMerger, EmptyTextNodeRemover, DocumentSorter, CastToList, CastableToList, SingletonAtomizer,
*/
/**
* Translates Saxon XPath 2.0 Expressions into Lux AbstractExpressions.
*/
public class SaxonTranslator {
public static final String CODEPOINT_COLLATION = "http://www.w3.org/2005/xpath-functions/collation/codepoint";
private Configuration config;
private HashMap namespaceDeclarations;
private static final HashMap dispatcher = new HashMap();
static {
for (ExprClass eclass : ExprClass.values()) {
dispatcher.put (eclass.toString(), eclass);
}
}
private QueryModule queryModule;
public SaxonTranslator (Configuration config) {
this.config = config;
namespaceDeclarations = new HashMap();
}
/** Converts from a Saxon to a lux xquery representation.
* @param xquery a Saxon representation of an XQuery module
* @return a lux representation of an equivalent XQuery module
*/
public XQuery queryFor(XQueryExecutable xquery) {
XQueryExpression saxonQuery = xquery.getUnderlyingCompiledQuery();
queryModule = saxonQuery.getStaticContext();
Iterator moduleIter = queryModule.getExecutable().getQueryLibraryModules();
ArrayList importedModules = new ArrayList();
while (moduleIter.hasNext()) {
QueryModule importedModule = (QueryModule) moduleIter.next();
String moduleNamespace = importedModule.getModuleNamespace();
String prefix = getPrefixForNamespace(moduleNamespace);
if (!StringUtils.isBlank(prefix)) {
// if prefix is blank, that indicates the imported module was not used
importedModules.add(new ModuleImport(prefix, moduleNamespace, importedModule.getSystemId()));
}
}
//StructuredQName[] extVars = saxonQuery.getExternalVariableNames();
// Namespace declarations are accumulated while walking the expression trees:
initializeNamespaces(saxonQuery);
FunctionDefinition[] functionDefinitions = getFunctionDefinitions();
AbstractExpression body = exprFor (saxonQuery.getExpression());
String defaultCollation = queryModule.getDefaultCollationName();
if (defaultCollation.equals (CODEPOINT_COLLATION)) {
defaultCollation = null;
}
VariableDefinition[] variableDefinitions = getVariableDefinitions(queryModule);
Boolean isPreserveNamespaces = (Boolean) config.getConfigurationProperty(FeatureKeys.XQUERY_PRESERVE_NAMESPACES);
Boolean isInheritNamespaces = (Boolean) config.getConfigurationProperty(FeatureKeys.XQUERY_INHERIT_NAMESPACES);
if (queryModule.isPreserveNamespaces() == isPreserveNamespaces &&
queryModule.isInheritNamespaces() == isInheritNamespaces) {
// both settings are the same as the current config, so no need to insert an explicit declaration in the query
isPreserveNamespaces = isInheritNamespaces = null;
} else {
isPreserveNamespaces = queryModule.isPreserveNamespaces();
isInheritNamespaces = queryModule.isInheritNamespaces();
}
return new XQuery(
queryModule.getDefaultElementNamespace(),
queryModule.getDefaultFunctionNamespace(),
defaultCollation,
importedModules.toArray(new ModuleImport[importedModules.size()]),
getNamespaceDeclarations(),
variableDefinitions,
functionDefinitions,
body,
queryModule.getBaseURI(),
isPreserveNamespaces,
isInheritNamespaces,
queryModule.isEmptyLeast());
}
private void initializeNamespaces(XQueryExpression saxonQuery) {
namespaceDeclarations.clear();
NamespaceResolver ns = saxonQuery.getStaticContext().getNamespaceResolver();
Iterator prefixes = ns.iteratePrefixes();
while (prefixes.hasNext()) {
String prefix = prefixes.next();
String nsURI = ns.getURIForPrefix(prefix, false);
if (!(NamespaceConstant.isReservedInQuery(nsURI) ||
(prefix.equals("saxon") && nsURI.equals(NamespaceConstant.SAXON)) ||
(prefix.equals("local") && nsURI.equals(NamespaceConstant.LOCAL)) ||
(prefix.equals("err") && nsURI.equals(NamespaceConstant.ERR)) ||
(prefix.equals("lux") && nsURI.equals(FunCall.LUX_NAMESPACE))))
{
namespaceDeclarations.put(prefix, nsURI);
}
}
}
private Namespace[] getNamespaceDeclarations() {
// String defElementNS = queryModule.getDefaultElementNamespace();
// String defFunctionNS = queryModule.getDefaultFunctionNamespace();
// We'd like to get our hands on queryModule.explicitPrologNamespaces :(
// Without it we have to resort to some scanning ugliness in search of
// all namespaces.
Namespace[] decls = new Namespace[namespaceDeclarations.size()];
int i = 0;
for (Map.Entry entry : namespaceDeclarations.entrySet()) {
decls[i++] = new Namespace (entry.getKey(), entry.getValue());
}
return decls;
}
private VariableDefinition[] getVariableDefinitions(QueryModule module) {
ArrayList defs = new ArrayList();
Iterator decls = module.getModuleVariables();
while (decls.hasNext()) {
GlobalVariable decl = decls.next();
GlobalVariable global = decl.getUltimateOriginalVariable();
String typeDesc = getTypeDescription (decl.getRequiredType());
Variable var = global != null ? (Variable) exprFor(global) : new Variable(qnameFor(decl.getVariableQName()));
int order = decl.getLineNumber() * 1000000 + decl.getColumnNumber();
VariableDefinition def = new VariableDefinition(var, exprFor(decl.getSelectExpression()), typeDesc, order);
defs.add(def);
}
VariableDefinition [] orderedDefs = defs.toArray(new VariableDefinition[0]);
Arrays.sort(orderedDefs);
return orderedDefs;
}
private void addNamespaceDeclaration (QName qname) {
String prefix = qname.getPrefix();
String namespaceURI = qname.getNamespaceURI();
if (! namespaceDeclarations.containsKey(prefix)) {
// We only want the outermost binding of each prefix; these
// are used to generate the namespace declarations in the query preamble
namespaceDeclarations.put(prefix, namespaceURI);
}
}
private FunctionDefinition[] getFunctionDefinitions() {
ArrayList functionDefinitions = new ArrayList();
Iterator functions = queryModule.getLocalFunctionLibrary().getFunctionDefinitions();
while (functions.hasNext()) {
XQueryFunction function = functions.next();
UserFunctionParameter[] params = function.getParameterDefinitions();
Variable[] args = new Variable[params.length];
for (int i = 0; i < params.length; i++) {
QName argname = qnameFor (params[i].getVariableQName());
addNamespaceDeclaration(argname);
args[i] = new Variable (argname, getTypeDescription(params[i].getRequiredType()));
}
QName fname = qnameFor(function.getFunctionName());
addNamespaceDeclaration(fname);
SequenceType resultType = function.getResultType();
ItemType returnType = resultType.getPrimaryType();
QName returnTypeName = null;
if (returnType instanceof NameTest) {
returnTypeName = qnameForNameCode (((NameTest) returnType).getFingerprint());
}
FunctionDefinition fdef = new FunctionDefinition(fname,
valueTypeForItemType(resultType.getPrimaryType()),
cardinalityOf(resultType), returnTypeName,
args, exprFor (function.getBody()));
functionDefinitions.add (fdef);
}
return functionDefinitions.toArray(new FunctionDefinition[0]);
}
private String getTypeDescription (SequenceType sequenceType) {
// typeDesc = decl.getRequiredType().getPrimaryType().toString();
if (sequenceType == null) {
return null;
}
String typeDesc;
ItemType itemType = sequenceType.getPrimaryType();
if (itemType.isAtomicType()) {
typeDesc = sequenceType.toString();
} else {
// Note: we drop specializations of the element() (and document()) types since
// compile-time errors will already have been reported, and run-time errors are handled
// using the "treat as" operator.
typeDesc = itemType.getPrimitiveItemType().toString();
int cardinality = sequenceType.getCardinality();
if (cardinality == StaticProperty.ALLOWS_ONE_OR_MORE) {
typeDesc = typeDesc + '+';
} else if (cardinality == StaticProperty.ALLOWS_ZERO_OR_MORE) {
typeDesc = typeDesc + '*';
} else if (cardinality == StaticProperty.ALLOWS_ZERO_OR_ONE) {
typeDesc = typeDesc + '?';
}
}
return typeDesc;
}
public AbstractExpression exprFor (AtomicSequenceConverter atomizer) {
return exprFor (atomizer.getBaseExpression());
}
/* return a QName suitable for use as a constructor of the given type */
private QName qnameFor (AtomicType type) {
if (type.isBuiltInType()) {
return qnameFor (((BuiltInAtomicType)type).getQualifiedName());
}
return qnameForNameCode(type.getNameCode());
}
public AbstractExpression exprFor (Atomizer atomizer) {
Expression base = atomizer.getBaseExpression();
return exprFor (base);
//return new FunCall (FunCall.FN_DATA, ValueType.ATOMIC, exprFor (base));
}
public AbstractExpression exprFor (AxisExpression expr) {
PathStep.Axis axis;
switch (expr.getAxis()) {
case AxisInfo.ANCESTOR: axis = PathStep.Axis.Ancestor; break;
case AxisInfo.PARENT: axis = PathStep.Axis.Parent; break;
case AxisInfo.DESCENDANT: axis = PathStep.Axis.Descendant; break;
case AxisInfo.PRECEDING: axis = PathStep.Axis.Preceding; break;
case AxisInfo.FOLLOWING: axis = PathStep.Axis.Following; break;
case AxisInfo.SELF: axis = PathStep.Axis.Self; break;
case AxisInfo.PRECEDING_SIBLING: axis = PathStep.Axis.PrecedingSibling; break;
case AxisInfo.FOLLOWING_SIBLING: axis = PathStep.Axis.FollowingSibling; break;
case AxisInfo.ANCESTOR_OR_SELF: axis = PathStep.Axis.AncestorSelf; break;
case AxisInfo.DESCENDANT_OR_SELF: axis = PathStep.Axis.DescendantSelf; break;
case AxisInfo.ATTRIBUTE: axis = PathStep.Axis.Attribute; break;
case AxisInfo.CHILD: axis = PathStep.Axis.Child; break;
default: throw new IllegalArgumentException("Unsupported axis in expression: " + expr.toString());
}
AbstractExpression ae = exprFor (axis, expr.getNodeTest());
/*
if (!Axis.isForwards[expr.getAxis()]) {
ae = new FunCall (new QName("reverse"), ae);
}
*/
return ae;
}
private BinaryOperation exprFor (PathStep.Axis axis, CombinedNodeTest nodeTest) {
NodeTest[] tests = nodeTest.getComponentNodeTests();
BinaryOperation.Operator op = operatorFor(nodeTest.getOperator());
return new BinaryOperation (exprFor(axis, tests[0]), op, exprFor(axis, tests[1]));
}
private lux.xpath.NodeTest nodeTestFor (DocumentNodeTest nodeTest) {
NodeTest elementTest = nodeTest.getElementTest();
int nameCode = elementTest.getFingerprint();
return new lux.xpath.NodeTest (ValueType.DOCUMENT, qnameForNameCode(nameCode));
}
private QName qnameForNameCode(int nameCode) {
StructuredQName sqname = config.getNamePool().getStructuredQName(nameCode);
String prefix = sqname.getPrefix();
String namespace = sqname.getURI();
if (StringUtils.isBlank(prefix) && StringUtils.isNotBlank(namespace)) {
prefix = getPrefixForNamespace(namespace);
}
return new QName (namespace, sqname.getLocalPart(), prefix);
}
public AbstractExpression exprFor (PathStep.Axis axis, NodeTest nodeTest) {
if (nodeTest != null && nodeTest instanceof CombinedNodeTest) {
return exprFor (axis, (CombinedNodeTest) nodeTest);
}
return new PathStep (axis, nodeTestFor (nodeTest));
}
private lux.xpath.NodeTest nodeTestFor (NodeTest nodeTest) {
if (nodeTest == null) {
return new lux.xpath.NodeTest(ValueType.NODE);
}
if (nodeTest instanceof DocumentNodeTest) {
return nodeTestFor ((DocumentNodeTest) nodeTest);
}
int nameCode = nodeTest.getFingerprint();
ValueType nodeType = valueTypeForItemType(nodeTest);
if (nameCode >= 0) { // matches a single node name
return new lux.xpath.NodeTest (nodeType, qnameForNameCode(nameCode));
} else { // matches multiple node names
if (nodeTest instanceof LocalNameTest) {
return new lux.xpath.NodeTest (nodeType, new QName(null, ((LocalNameTest)nodeTest).getLocalName(), "*"));
}
if (nodeTest instanceof NamespaceTest) {
NamespaceTest namespaceTest = (NamespaceTest) nodeTest;
String namespace = namespaceTest.getNamespaceURI();
String prefix = getPrefixForNamespace (namespace);
QName qname = new QName(namespace, "*", prefix);
addNamespaceDeclaration(qname);
return new lux.xpath.NodeTest (nodeType, qname);
}
IntSet nameCodes = nodeTest.getRequiredNodeNames();
if (nameCodes == IntUniversalSet.getInstance()) {
return new lux.xpath.NodeTest (nodeType);
}
throw new IllegalArgumentException("Unsupported node test: " + nodeTest.toString());
}
}
private String getPrefixForNamespace(String namespace) {
String prefix = config.getNamePool().suggestPrefixForURI(namespace);
if (prefix == null && queryModule != null) {
// queryModule can be null when optimizing a query fragment
NamespaceResolver resolver = queryModule.getNamespaceResolver();
Iterator prefixes = resolver.iteratePrefixes();
while (prefixes.hasNext()) {
String p = prefixes.next();
if (namespace.equals(resolver.getURIForPrefix(p, true))) {
prefix = p;
break;
}
}
}
if (prefix != null) {
namespaceDeclarations.put(prefix, namespace);
} else {
for (Map.Entry ns : namespaceDeclarations.entrySet()) {
if (ns.getValue().equals(namespace))
return ns.getKey();
}
// this will happen if queryModule is null; it's actually ok in the only known case, which
// is when we translate fragments while checking for document ordering (in which case the
// exactitude of the QName translation is irrelevant).
prefix = "";
}
return prefix;
}
// covers ArithmeticExpression, BooleanExpression, GeneralComparison, ValueComparison,
// IdentityComparison, RangeExpression
public AbstractExpression exprFor (BinaryExpression expr) {
Expression [] operands = expr.getOperands();
BinaryOperation.Operator op = operatorFor(expr.getOperator());
if (operands[0] instanceof AtomicSequenceConverter || operands[1] instanceof AtomicSequenceConverter) {
// Saxon optimizes some general sequences into atomic sequences in a way that
// we can't represent in XQuery directly. So we use a General Comparison in that case
// which we *think* will mimic Saxon's behavior
op = generalizeOperator (op);
}
return new BinaryOperation (exprFor(operands[0]), op, exprFor(operands[1]));
}
private static BinaryOperation.Operator generalizeOperator (BinaryOperation.Operator op) {
switch (op) {
case AEQ: return BinaryOperation.Operator.EQUALS;
case ANE : return BinaryOperation.Operator.NE;
case ALT : return BinaryOperation.Operator.LT;
case ALE : return BinaryOperation.Operator.LE;
case AGT : return BinaryOperation.Operator.GT;
case AGE : return BinaryOperation.Operator.GE;
default: return op;
}
}
private static BinaryOperation.Operator operatorFor(int op) {
switch (op) {
case Token.AND: return BinaryOperation.Operator.AND;
case Token.OR: return BinaryOperation.Operator.OR;
case Token.INTERSECT: return BinaryOperation.Operator.INTERSECT;
case Token.EXCEPT: return BinaryOperation.Operator.EXCEPT;
case Token.UNION: return BinaryOperation.Operator.UNION;
case Token.PLUS: return BinaryOperation.Operator.ADD;
case Token.MINUS: return BinaryOperation.Operator.SUB;
case Token.MULT: return BinaryOperation.Operator.MUL;
case Token.DIV: return BinaryOperation.Operator.DIV;
case Token.IDIV: return BinaryOperation.Operator.IDIV;
case Token.MOD: return BinaryOperation.Operator.MOD;
case Token.EQUALS: return BinaryOperation.Operator.EQUALS;
case Token.NE: return BinaryOperation.Operator.NE;
case Token.LT: return BinaryOperation.Operator.LT;
case Token.GT: return BinaryOperation.Operator.GT;
case Token.LE: return BinaryOperation.Operator.LE;
case Token.GE: return BinaryOperation.Operator.GE;
case Token.FEQ: return BinaryOperation.Operator.AEQ;
case Token.FNE: return BinaryOperation.Operator.ANE;
case Token.FLT: return BinaryOperation.Operator.ALT;
case Token.FLE: return BinaryOperation.Operator.ALE;
case Token.FGT: return BinaryOperation.Operator.AGT;
case Token.FGE: return BinaryOperation.Operator.AGE;
case Token.IS: return BinaryOperation.Operator.IS;
case Token.PRECEDES: return BinaryOperation.Operator.BEFORE;
case Token.FOLLOWS: return BinaryOperation.Operator.AFTER;
case Token.TO: return BinaryOperation.Operator.TO;
case Token.NEGATE: return BinaryOperation.Operator.SUB;
default: throw new IllegalArgumentException("Unsupported operator: " + op);
}
}
public AbstractExpression exprFor (Block expr) {
return exprFor (expr.getChildren());
}
public AbstractExpression exprFor (CastExpression expr) {
Expression base = expr.getBaseExpression();
AtomicType type = expr.getTargetType();
return castExprFor(exprFor(base), type);
}
public AbstractExpression exprFor (CastableExpression expr) {
Expression base = expr.getBaseExpression();
AtomicType type = expr.getTargetType();
return new lux.xquery.CastableExpression(exprFor(base), type.toString());
}
private AbstractExpression castExprFor (AbstractExpression ae, AtomicType type) {
if (type.isAbstract()) {
return ae;
}
return new FunCall (qnameFor(type), valueTypeForItemType(type), ae);
}
public AbstractExpression exprFor (ItemChecker checker) {
Expression base = checker.getBaseExpression();
AbstractExpression baseExpr = exprFor(base);
return baseExpr;
}
private Sequence exprFor (Expression[] exprs) {
AbstractExpression[] aex = new AbstractExpression [exprs.length];
for (int i = 0 ; i < exprs.length; i++) {
aex[i] = exprFor (exprs[i]);
}
return new Sequence (aex);
}
public AbstractExpression exprFor (Choose choose) {
// convert a list of condition/action pairs (a la XSLT) to a chain
// of if-then-else conditions a-la XQuery
Expression[] conds = choose.getConditions();
Expression[] actions = choose.getActions();
int l = conds.length;
if (actions.length != conds.length) {
throw new LuxException ("Choose must have the same number of actions as conditions");
}
if (l < 2) {
return new Conditional (exprFor (conds[0]), exprFor(actions[0]), LiteralExpression.EMPTY);
}
l -= 2;
AbstractExpression tail = new Conditional(exprFor (conds[l]), exprFor (actions[l]), exprFor(actions[l+1]));
while (l-- > 0) {
tail = new Conditional (exprFor (conds[l]), exprFor(actions[l]), tail);
}
return tail;
}
public AbstractExpression exprFor (Comment expr) {
return new CommentConstructor(exprFor(expr.getContentExpression()));
}
public AbstractExpression exprFor (ComputedAttribute expr) {
return new AttributeConstructor(exprFor(expr.getNameExpression()),
exprFor(expr.getContentExpression()));
}
public AbstractExpression exprFor (ComputedElement expr) {
return new ComputedElementConstructor(exprFor (expr.getNameExpression()),
exprFor (expr.getContentExpression()));
}
public AbstractExpression exprFor (ContextItemExpression expr) {
return new Dot();
}
private AbstractExpression exprFor(CopyOf expr) {
return exprFor (expr.getSelectExpression());
}
public AbstractExpression exprFor (DocumentInstr documentInstr) {
return new DocumentConstructor (exprFor (documentInstr.getContentExpression()));
}
public AbstractExpression exprFor (FilterExpression expr) {
AbstractExpression filtered = exprFor (expr.getControllingExpression());
AbstractExpression filter = exprFor (expr.getFilter());
return new Predicate(filtered, filter);
}
public AbstractExpression exprFor (FirstItemExpression expr) {
return new Subsequence (exprFor (expr.getBaseExpression()), LiteralExpression.ONE, LiteralExpression.ONE);
}
public AbstractExpression exprFor (FixedAttribute attribute) {
NodeName name = attribute.getAttributeName();
QName qname = qnameFor (name.getStructuredQName());
AttributeConstructor att = new AttributeConstructor(
new LiteralExpression(qname.toString(), ValueType.STRING),
exprFor (attribute.getContentExpression()));
return att;
}
public AbstractExpression exprFor (FixedElement element) {
NodeName name = element.getElementName();
QName qname = qnameFor (name.getStructuredQName());
AbstractExpression content = exprFor (element.getContentExpression());
Namespace [] namespaces = namespacesFor (element.getActiveNamespaces());
return new ElementConstructor(qname, namespaces, content);
}
public AbstractExpression exprFor (ForExpression forExpr) {
StructuredQName var = forExpr.getVariableQName();
Expression seq = forExpr.getSequence();
Expression returns = forExpr.getAction();
PositionVariable posvar = forExpr.getPositionVariable();
Variable pos = null;
if (posvar != null) {
pos = new Variable(qnameFor(posvar.getVariableQName()));
}
return new FLWOR(exprFor(returns), new ForClause (new Variable(qnameFor(var)), pos, exprFor(seq)));
}
public AbstractExpression exprFor (FunctionCall funcall) {
if (funcall.getFunctionName().equals(itemAtQName)) {
return new Subsequence(exprFor (funcall.getArguments()[0]), exprFor(funcall.getArguments()[1]), LiteralExpression.ONE);
}
else if (functionEqualsBuiltin(funcall, "reverse")) {
// Saxon wraps a call to reverse() around reverse axis expressions; its axis expression
// always returns items in axis (reverse) order, unlike an xpath axis expression, whose results
// are returned in different order depending on the context
Expression arg = funcall.getArguments()[0];
if ((arg.getSpecialProperties() & StaticProperty.REVERSE_DOCUMENT_ORDER) != 0 ||
(! Cardinality.allowsMany(arg.getCardinality()))) {
// if (arg instanceof AxisExpression && (!Axis.isForwards[((AxisExpression) arg).getAxis()])) {
// wrap in a sequence so as to preserve document order using an expression that will serialize
// to an appropriate xpath syntax
return new Sequence (exprFor (arg));
}
}
else if (functionEqualsBuiltin(funcall, "subsequence")) {
if (funcall.getNumberOfArguments() == 2) {
// This is actually dead code, since Saxon always creates a TailExpression, but we have no guarantee,
// so we keep this just in case that should change
return new Subsequence (exprFor(funcall.getArguments()[0]), exprFor(funcall.getArguments()[1]));
} else {
if (funcall.getNumberOfArguments() != 3) {
throw new LuxException ("call to subsequence has " + funcall.getNumberOfArguments() + " arguments?");
}
return new Subsequence (exprFor(funcall.getArguments()[0]), exprFor(funcall.getArguments()[1]), exprFor(funcall.getArguments()[2]));
}
}
/*
if (functionEqualsBuiltin(funcall, "string-join")) {
// undo this optimization of Saxon's
if (funcall.getArguments()[0] instanceof AtomicSequenceConverter) {
return exprFor (funcall.getArguments()[0]);
}
}
*/
Expression[] args = funcall.getArguments();
AbstractExpression[] aargs = new AbstractExpression[args.length];
for (int i = 0; i < args.length; i++) {
aargs[i] = exprFor (args[i]);
}
Entry entry = StandardFunction.getFunction(funcall.getFunctionName().getDisplayName(), aargs.length);
ValueType returnType = entry != null ? valueTypeForItemType (entry.itemType) : ValueType.VALUE;
QName fnQName = qnameFor (funcall.getFunctionName());
if (functionEqualsBuiltin(funcall, "root") || fnQName.equals(FunCall.LUX_SEARCH))
{
// root() may return an element when executed in the context of a fragment
// However for the purposes of our optimizer, we want to know if it is returning
// documents. We only optimize absolute expressions, and this inference is correct in those cases.
returnType = ValueType.DOCUMENT;
}
return new FunCall (qnameFor (funcall.getFunctionName()), returnType, aargs);
}
private boolean functionEqualsBuiltin (FunctionCall funcall, String builtinFunction) {
return funcall.getFunctionName().getDisplayName().equals (builtinFunction);
}
public AbstractExpression exprFor (GlobalVariable var) {
// TODO: encode the declared type
return new Variable (qnameFor (var.getVariableQName()));
}
public AbstractExpression exprFor (IntegerRangeTest rangeTest) {
return new BinaryOperation
(new BinaryOperation
(exprFor (rangeTest.getValueExpression()), Operator.ALE,
exprFor (rangeTest.getMaxValueExpression())),
Operator.AND,
new BinaryOperation
(exprFor (rangeTest.getValueExpression()), Operator.AGE,
exprFor (rangeTest.getMinValueExpression())));
}
private AbstractExpression exprFor (InstanceOfExpression expr) {
ItemType type = expr.getRequiredItemType();
String typeExpr;
if (type.isPlainType()) {
typeExpr = type.toString();
} else if (type instanceof NodeTest) {
lux.xpath.NodeTest nodeTest = nodeTestFor((NodeTest)type);
typeExpr = nodeTest.toString();
} else {
throw new LuxException ("Unsupported node test in instance-of expression: " + expr.toString());
}
return new InstanceOf(typeExpr, exprFor (expr.getBaseExpression()));
}
private ValueType valueTypeForItemType(ItemType itemType) {
if (itemType.isAtomicType()) {
switch (itemType.getPrimitiveType()) {
case StandardNames.XS_STRING:
case StandardNames.XS_ANY_URI:
return ValueType.STRING;
case StandardNames.XS_DATE:
return ValueType.DATE;
case StandardNames.XS_DATE_TIME:
return ValueType.DATE_TIME;
case StandardNames.XS_G_YEAR:
return ValueType.YEAR;
case StandardNames.XS_G_YEAR_MONTH:
return ValueType.YEAR_MONTH;
case StandardNames.XS_G_MONTH:
return ValueType.MONTH;
case StandardNames.XS_G_DAY:
return ValueType.DAY;
case StandardNames.XS_G_MONTH_DAY:
return ValueType.MONTH_DAY;
case StandardNames.XS_DAY_TIME_DURATION:
return ValueType.DAY_TIME_DURATION;
case StandardNames.XS_YEAR_MONTH_DURATION:
return ValueType.YEAR_MONTH_DURATION;
case StandardNames.XS_INT:
return ValueType.INT;
case StandardNames.XS_INTEGER:
if (itemType.equals(BuiltInAtomicType.INT)) {
return ValueType.INT;
}
return ValueType.INTEGER;
case StandardNames.XS_DOUBLE:
return ValueType.DOUBLE;
case StandardNames.XS_FLOAT:
return ValueType.FLOAT;
case StandardNames.XS_DECIMAL:
return ValueType.DECIMAL;
case StandardNames.XS_BOOLEAN:
return ValueType.BOOLEAN;
case StandardNames.XS_TIME:
return ValueType.TIME;
case StandardNames.XS_HEX_BINARY:
return ValueType.HEX_BINARY;
case StandardNames.XS_BASE64_BINARY:
return ValueType.BASE64_BINARY;
case StandardNames.XS_UNTYPED_ATOMIC:
return ValueType.UNTYPED_ATOMIC;
case StandardNames.XS_QNAME:
return ValueType.QNAME;
default:
return ValueType.ATOMIC;
}
}
if (itemType instanceof NodeTest) {
NodeTest nodeTest = (NodeTest) itemType;
switch (nodeTest.getPrimitiveType()) {
case Type.NODE: return ValueType.NODE;
case Type.ELEMENT: return ValueType.ELEMENT;
case Type.TEXT: return ValueType.TEXT;
case Type.ATTRIBUTE: return ValueType.ATTRIBUTE;
case Type.DOCUMENT: return ValueType.DOCUMENT;
case Type.PROCESSING_INSTRUCTION: return ValueType.PROCESSING_INSTRUCTION;
case Type.COMMENT: return ValueType.COMMENT;
case Type.EMPTY: return ValueType.EMPTY;
}
}
if (itemType == ErrorType.getInstance()) {
return ValueType.EMPTY;
}
// could be a function type? or namespace()?
return ValueType.VALUE;
}
public AbstractExpression exprFor (LastItemExpression expr) {
return new Subsequence (exprFor (expr.getBaseExpression()), FunCall.LastExpression, LiteralExpression.ONE);
}
public AbstractExpression exprFor (LetExpression let) {
StructuredQName var = let.getVariableQName();
Expression seq = let.getSequence();
Expression returns = let.getAction();
return new FLWOR(exprFor(returns), new LetClause (new Variable(qnameFor(var), getTypeDescription(let.getRequiredType())), exprFor(seq)));
}
public AbstractExpression exprFor (Literal literal) {
// This could be a sequence!!
GroundedValue value = literal.getValue();
try {
int len = value.getLength();
if (len == 0) {
return LiteralExpression.EMPTY;
}
SequenceIterator iter = value.iterate();
if (len > 1) {
ArrayList items = new ArrayList();
Item member;
while ((member = iter.next()) != null) {
if (member instanceof AtomicValue) {
items.add (exprFor ((AtomicValue) member));
} else {
throw new LuxException ("unsupported node in a literal sequence: " + literal.toString());
}
}
return new Sequence (items.toArray(new LiteralExpression[0]));
}
return exprFor ((AtomicValue) iter.next());
} catch (XPathException e) {
throw new LuxException (e);
}
}
public LiteralExpression exprFor (AtomicValue value) {
ValueType type = valueTypeForItemType(value.getItemType());
if (value instanceof CalendarValue || value instanceof DurationValue ||
value instanceof BigIntegerValue) {
//return new LiteralExpression(((CalendarValue)value).getCalendar(), type);
// , value.getPrimitiveType().getQualifiedName().toString()
return new LiteralExpression(value.getStringValue(), type);
}
if (value instanceof QNameValue) {
return new LiteralExpression (qnameFor (((QNameValue) value).getStructuredQName()), type);
}
try {
Object oval = SequenceTool.convertToJava(value);
return new LiteralExpression(oval, type);
} catch (XPathException e) {
throw new LuxException (e);
}
}
public AbstractExpression exprFor (NegateExpression expr) {
return new UnaryMinus(exprFor (expr.getBaseExpression()));
}
public AbstractExpression exprFor (ParentNodeExpression expr) {
return new PathStep(PathStep.Axis.Parent, new lux.xpath.NodeTest(ValueType.NODE));
}
public AbstractExpression exprFor (ProcessingInstruction pi) {
return new ProcessingInstructionConstructor(exprFor(pi.getNameExpression()), exprFor(pi.getContentExpression()));
}
public AbstractExpression exprFor (QuantifiedExpression expr) {
Satisfies.Quantifier quantifier = expr.getOperator() == Token.SOME ? Quantifier.SOME : Quantifier.EVERY;
return new Satisfies(quantifier, new Variable(qnameFor(expr.getVariableQName())), exprFor(expr.getSequence()), exprFor (expr.getAction()));
}
public AbstractExpression exprFor (RootExpression expr) {
return new Root();
}
public AbstractExpression exprFor (SlashExpression expr) {
AbstractExpression lq = exprFor (expr.getControllingExpression());
AbstractExpression rq = exprFor (expr.getControlledExpression());
return new PathExpression(lq, rq);
}
public AbstractExpression exprFor (SubscriptExpression expr) {
return new Subsequence (exprFor (expr.getBaseExpression()), exprFor(expr.getSubscriptExpression()), LiteralExpression.ONE);
}
public AbstractExpression exprFor (TailExpression expr) {
return new Subsequence (exprFor (expr.getBaseExpression()), new LiteralExpression(expr.getStart()));
}
/*
* just a kind of UnaryExpression?
public AbstractExpression exprFor (TailCallLoop expr) {
return exprFor (expr.getBaseExpression());
}
*/
public AbstractExpression exprFor (UnaryExpression expr) {
return exprFor (expr.getBaseExpression());
}
public AbstractExpression exprFor (ValueOf valueOf) {
return new TextConstructor(exprFor (valueOf.getContentExpression()));
}
public AbstractExpression exprFor (VariableReference var) {
if (var.getBinding() != null) {
StructuredQName varName= var.getBinding().getVariableQName();
return new Variable (qnameFor (varName));
} else {
// total HACK, but Saxon provides no other public method to retrieve the constant value
try {
Object o = var.optimize(null, null);
if (o instanceof Literal) {
return exprFor ((Literal) o);
}
} catch (XPathException e) {
throw new LuxException ("Unsupported variable reference: " + var);
}
throw new LuxException ("Unsupported variable reference: " + var);
}
}
private static final StructuredQName itemAtQName = new StructuredQName("", NamespaceConstant.SAXON, "item-at");
private QName qnameFor(StructuredQName name) {
QName qname = new QName (name.getNamespaceBinding().getURI(), name.getLocalPart(), name.getNamespaceBinding().getPrefix());
if (!(qname.getPrefix().equals ("fn") && qname.getNamespaceURI().equals(FunCall.FN_NAMESPACE) ||
qname.getPrefix().equals("local") && qname.getNamespaceURI().equals(FunCall.LOCAL_NAMESPACE) ||
qname.getPrefix().equals("xs") && qname.getNamespaceURI().equals(FunCall.XS_NAMESPACE))) {
addNamespaceDeclaration(qname);
}
return qname;
}
public AbstractExpression exprFor (CompareToIntegerConstant comp) {
Operator op = operatorFor (comp.getComparisonOperator());
long num = comp.getComparand();
return new BinaryOperation (exprFor (comp.getOperand()), op, new LiteralExpression (num));
}
private Namespace[] namespacesFor(NamespaceBinding[] activeNamespaces) {
if (activeNamespaces == null)
return null;
Namespace[] namespaces = new Namespace[activeNamespaces.length];
int i = 0;
for (NamespaceBinding binding : activeNamespaces) {
namespaces[i++] = new Namespace (binding.getPrefix(), binding.getURI());
}
return namespaces;
}
public AbstractExpression exprFor (FLWORExpression flwor) {
List saxonClauses = flwor.getClauseList();
int i = 0;
while (i < saxonClauses.size() && saxonClauses.get(i).getClauseKey() == Clause.WHERE) {
// Saxon optimizes constant where clauses to the left of the expression where they
// are no longer syntactically valid as xquery
++i;
}
FLWORClause clauses[];
int k = 0;
if (i < saxonClauses.size()) {
clauses = new FLWORClause[saxonClauses.size()];
// add clauses up to but not including the first order by clause
for (int j = i; j < saxonClauses.size() &&
saxonClauses.get(j).getClauseKey() != Clause.ORDERBYCLAUSE;
j++)
{
clauses[k++] = clauseFor (saxonClauses.get(j));
}
} else {
clauses = new FLWORClause[saxonClauses.size() + 1];
}
if (k == 0) {
// Generate a dummy let clause if the where clause was the only clause??
clauses[k++] = new LetClause(new Variable (new QName("x")), LiteralExpression.ONE);
}
if (i > 0) {
// append any of the preamble where clauses
for (int j = 0; j < i; j++) {
clauses[k++] = clauseFor (saxonClauses.get(j));
}
}
// and the rest of the clauses...
while (k < saxonClauses.size()) {
clauses[k] = clauseFor (saxonClauses.get(k));
++k;
}
return new FLWOR(exprFor (flwor.getReturnClause()), clauses);
}
private FLWORClause clauseFor (Clause clause) {
switch (clause.getClauseKey()) {
case Clause.LET: return clauseFor ((net.sf.saxon.expr.flwor.LetClause) clause);
case Clause.FOR: return clauseFor ((net.sf.saxon.expr.flwor.ForClause) clause);
case Clause.WHERE: return clauseFor ((net.sf.saxon.expr.flwor.WhereClause) clause);
case Clause.ORDERBYCLAUSE: return clauseFor ((net.sf.saxon.expr.flwor.OrderByClause) clause);
default: throw new LuxException ("Unsupported FLWOR clause " + clause.getClass().getSimpleName());
}
}
private FLWORClause clauseFor (net.sf.saxon.expr.flwor.ForClause clause) {
AbstractExpression seq = exprFor (clause.getSequence());
Variable var = new Variable (qnameFor(clause.getRangeVariable().getVariableQName()));
LocalVariableBinding positionVariable = clause.getPositionVariable();
Variable pos;
if (positionVariable != null) {
pos = new Variable (qnameFor(positionVariable.getVariableQName()));
} else {
pos = null;
}
return new ForClause(var, pos, seq);
}
private FLWORClause clauseFor (net.sf.saxon.expr.flwor.LetClause clause) {
AbstractExpression seq = exprFor (clause.getSequence());
Variable var = new Variable (qnameFor(clause.getRangeVariable().getVariableQName()));
return new LetClause(var, seq);
}
private FLWORClause clauseFor (net.sf.saxon.expr.flwor.WhereClause clause) {
return new WhereClause(exprFor (clause.getPredicate()));
}
private FLWORClause clauseFor (net.sf.saxon.expr.flwor.OrderByClause clause) {
SortKeyDefinition[] sortKeyDefs = clause.getSortKeyDefinitions();
SortKey[] sortKeys = new SortKey[sortKeyDefs.length];
for (int i = 0; i < sortKeyDefs.length; i++) {
sortKeys[i] = sortKeyFor (sortKeyDefs[i]);
}
return new OrderByClause(sortKeys);
}
private SortKey sortKeyFor (SortKeyDefinition sortKeyDef) {
return new SortKey (exprFor (sortKeyDef.getSortKey()),
(LiteralExpression) exprFor (sortKeyDef.getOrder()),
exprFor (sortKeyDef.getCollationNameExpression()),
sortKeyDef.getEmptyLeast());
}
private static int cardinalityOf (SequenceType type) {
int cardinality =type.getCardinality();
if (cardinality == StaticProperty.ALLOWS_ONE_OR_MORE) {
return ValueType.ONE_OR_MORE;
} else if (cardinality == StaticProperty.ALLOWS_ZERO_OR_MORE) {
return ValueType.ANY_NUMBER;
} else if (cardinality == StaticProperty.ALLOWS_ZERO_OR_ONE) {
return ValueType.ZERO_OR_ONE;
} else if (cardinality == StaticProperty.ALLOWS_ONE) {
return ValueType.EXACTLY_ONE;
} else {
return ValueType.EXACTLY_ZERO;
}
}
public AbstractExpression exprFor (Expression expr) {
if (expr == null) {
return null;
}
ExprClass exprClass = null;
for (Class cls = expr.getClass(); exprClass == null && cls != Object.class; cls = cls.getSuperclass()) {
exprClass = dispatcher.get (cls.getSimpleName());
}
if (exprClass == null) {
throw new UnsupportedOperationException ("unhandled expression type: " + expr.getClass().getSimpleName() + " in " + expr.toString());
}
switch (exprClass) {
case AtomicSequenceConverter:
return exprFor ((AtomicSequenceConverter)expr);
case Atomizer:
return exprFor ((Atomizer) expr);
case AxisExpression:
return exprFor ((AxisExpression) expr);
case BinaryExpression:
return exprFor ((BinaryExpression) expr);
case Block:
return exprFor ((Block) expr);
case CastExpression:
return exprFor ((CastExpression) expr);
case CastableExpression:
return exprFor ((CastableExpression) expr);
case Choose:
return exprFor ((Choose) expr);
case Comment:
return exprFor ((Comment) expr);
case CompareToIntegerConstant:
return exprFor ((CompareToIntegerConstant) expr);
case ComputedAttribute:
return exprFor ((ComputedAttribute) expr);
case ComputedElement:
return exprFor ((ComputedElement) expr);
case ContextItemExpression:
return exprFor ((ContextItemExpression) expr);
case CopyOf:
return exprFor ((CopyOf) expr);
case DocumentInstr:
return exprFor ((DocumentInstr) expr);
case DocumentSorter:
return exprFor ((DocumentSorter) expr);
case FilterExpression:
return exprFor ((FilterExpression) expr);
case FirstItemExpression:
return exprFor ((FirstItemExpression) expr);
case FixedAttribute:
return exprFor ((FixedAttribute) expr);
case FixedElement:
return exprFor ((FixedElement) expr);
case FLWORExpression:
return exprFor ((FLWORExpression) expr);
case ForExpression:
return exprFor ((ForExpression) expr);
case FunctionCall:
return exprFor ((FunctionCall) expr);
case InstanceOfExpression:
return exprFor ((InstanceOfExpression) expr);
case IntegerRangeTest:
return exprFor ((IntegerRangeTest) expr);
case ItemChecker:
return exprFor ((ItemChecker) expr);
case LastItemExpression:
return exprFor ((LastItemExpression) expr);
case LetExpression:
return exprFor ((LetExpression) expr);
case Literal:
return exprFor ((Literal) expr);
case NegateExpression:
return exprFor ((NegateExpression) expr);
case ParentNodeExpression:
return exprFor ((ParentNodeExpression) expr);
case ProcessingInstruction:
return exprFor ((ProcessingInstruction) expr);
case QuantifiedExpression:
return exprFor ((QuantifiedExpression) expr);
case RootExpression:
return exprFor ((RootExpression) expr);
case SingletonAtomizer:
return exprFor ((SingletonAtomizer) expr);
case SlashExpression:
return exprFor ((SlashExpression) expr);
case SubscriptExpression:
return exprFor ((SubscriptExpression) expr);
case TailExpression:
return exprFor ((TailExpression) expr);
case TreatAs:
return exprFor ((ItemChecker) expr);
case UnaryExpression:
return exprFor ((UnaryExpression) expr);
case ValueOf:
return exprFor ((ValueOf) expr);
//case LocalVariableReference:
case VariableReference:
return exprFor ((VariableReference) expr);
case ErrorExpression:
throw new LuxException ("A potential run-time error was detected during compilation: " + ((ErrorExpression) expr).getException().getMessageAndLocation(),
((ErrorExpression) expr).getException());
default:
throw new UnsupportedOperationException("unhandled expression type: " + expr.getClass().getSimpleName() + " in " + expr.toString());
}
}
// list the names of all the classes
// for which we have defined overrides of exprFor
// - probably should do this by introspection
private enum ExprClass {
AtomicSequenceConverter,
Atomizer,
AxisExpression,
BinaryExpression,
CastExpression,
CastableExpression,
CompareToIntegerConstant,
ComputedAttribute,
ComputedElement,
ContextItemExpression,
CopyOf,
DocumentSorter,
ErrorExpression,
Expression,
FilterExpression,
FirstItemExpression,
ForExpression,
FunctionCall,
InstanceOfExpression,
IntegerRangeTest,
ItemChecker,
LastItemExpression,
LetExpression,
Literal,
NegateExpression,
ProcessingInstruction,
ParentNodeExpression,
QuantifiedExpression,
RootExpression,
SingletonAtomizer,
SlashExpression,
SubscriptExpression,
TailExpression,
TreatAs,
UnaryExpression,
VariableReference,
FLWORExpression,
Block,
Choose,
Comment,
DocumentInstr,
FixedAttribute,
FixedElement,
GlobalVariable,
ValueOf
}
}
/* 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/. */
