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* Copyright (c) 2001-2013 Oracle and/or its affiliates. All rights reserved.
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package com.sun.msv.reader.trex.ng.comp;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import org.relaxng.datatype.Datatype;
import org.xml.sax.Locator;
import com.sun.msv.grammar.AttributeExp;
import com.sun.msv.grammar.ChoiceExp;
import com.sun.msv.grammar.DataExp;
import com.sun.msv.grammar.ElementExp;
import com.sun.msv.grammar.Expression;
import com.sun.msv.grammar.ListExp;
import com.sun.msv.grammar.NameClass;
import com.sun.msv.grammar.OneOrMoreExp;
import com.sun.msv.grammar.SimpleNameClass;
import com.sun.msv.grammar.ValueExp;
import com.sun.msv.grammar.util.ExpressionWalker;
import com.sun.msv.grammar.util.RefExpRemover;
import com.sun.msv.util.StringPair;
import com.sun.msv.verifier.regexp.ResidualCalculator;
import com.sun.msv.verifier.regexp.StringToken;
class DefAttCompatibilityChecker extends CompatibilityChecker {
DefAttCompatibilityChecker( RELAXNGCompReader _reader, Map _defaultedAttributes ) {
super(_reader);
this.defaultedAttributes = _defaultedAttributes;
}
protected void setCompatibility( boolean val ) {
grammar.isDefaultAttributeValueCompatible = val;
}
private final Map defaultedAttributes;
/**
* used to abort the check.
*/
private static final class Abort extends RuntimeException {}
private static final class DefAttMap {
/**
* the map from the attribute name (as StringPair) to the default value (as String).
*/
final Map defaultAttributes;
/**
* one of the ElementExps that have this particular element name.
* used only for the error reporting.
*/
final ElementExp sampleDecl;
DefAttMap( ElementExp sample, Map atts ) { this.sampleDecl=sample; this.defaultAttributes=atts; }
}
private final RefExpRemover refRemover =
new RefExpRemover(reader.pool,false);
/**
* returns true if the exp is equivalent to <empty/> after
* the simplification.
*/
private boolean isEpsilon( Expression exp ) {
if(exp==Expression.epsilon) return true;
return exp.visit(refRemover) == Expression.epsilon;
}
/**
* tests the compatibility with the default attribute feature.
*/
public void test() {
grammar.isDefaultAttributeValueCompatible = true;
if( defaultedAttributes.size()==0 )
return; // no default attribute is used. no need for the check.
Iterator itr = defaultedAttributes.entrySet().iterator();
ResidualCalculator resCalc = new ResidualCalculator(reader.pool);
while( itr.hasNext() ) {
Map.Entry item = (Map.Entry)itr.next();
AttributeExp exp = (AttributeExp)item.getKey();
String value = (String)item.getValue();
// tests if the name class is simple
if(!(exp.nameClass instanceof SimpleNameClass))
reportCompError(
new Locator[]{reader.getDeclaredLocationOf(exp)},
CERR_DEFVALUE_NAME_IS_NOT_SIMPLE);
// tests if there is no context-dependent datatypes
try {
exp.exp.visit( contextDependentTypeChecker );
} catch( Abort a ) {
continue; // abort further check. this error is already reported.
}
// tests if the default value matches the content model of this attribute
StringToken token = new StringToken(resCalc,value,null,null);
if(!resCalc.calcResidual( exp.exp, token ).isEpsilonReducible() ) {
// the default value was rejected by the content model.
reportCompError(
new Locator[]{reader.getDeclaredLocationOf(exp)},
CERR_DEFVALUE_INVALID, new Object[]{value});
}
}
if( !grammar.isDefaultAttributeValueCompatible )
// if there already is an error, abort further check.
return;
// a map from element names to DefAttMap
final Map name2value = new HashMap();
// a set of all ElementExps in the grammar.
final Set elements = new HashSet();
// tests if defaulted attributes are optional and doesn't have
// oneOrMoreAncestor.
// also (element name,attribute name)->default value
// map is created here.
grammar.visit( new ExpressionWalker() {
// in the first pass, the elements variable
// is used to record visited ElementExps.
// condition that has to be met for default attributes to be valid.
private boolean inOneOrMore = false;
private boolean inChoice = false;
private boolean inOptionalChoice = false;
private boolean inSimpleElement = false;
/**
* A map from attribute name to defaulted AttributeExps
* of the current element.
*/
private Map currentAttributes = null;
/**
* name of the current ElementExp
* within which we are currently processing.
*/
private SimpleNameClass currentElementName = null;
public void onElement( ElementExp exp ) {
if( !elements.add(exp) )
return; // this element is already checked.
// otherwise check the content model of this element.
// update the value of the isSimpleElement field.
final boolean oldSE = inSimpleElement;
final boolean oldOC = inOptionalChoice;
final boolean oldC = inChoice;
final boolean oldOOM = inOneOrMore;
final SimpleNameClass prevElemName = currentElementName;
final Map oldCA = currentAttributes;
inSimpleElement = (exp.getNameClass() instanceof SimpleNameClass);
inOptionalChoice = true;
inChoice = false;
inOneOrMore = false;
StringPair en = null;
if(inSimpleElement) {
currentElementName = (SimpleNameClass)exp.getNameClass();
en = new StringPair(currentElementName);
currentAttributes = new HashMap();
} else
currentElementName = null;
exp.contentModel.visit(this);
if(en!=null) {
DefAttMap m = (DefAttMap)name2value.get(en);
if(m==null)
name2value.put(en, new DefAttMap(exp,currentAttributes));
else {
// there was another ElementExp with the same name.
// we need to check that their default attribute values
// are consistent.
if(!m.defaultAttributes.equals(currentAttributes)) {
// TODO: provide better message
reportCompError(
new Locator[]{
reader.getDeclaredLocationOf(m.sampleDecl),
reader.getDeclaredLocationOf(exp)},
CERR_DEFVALUE_COMPETING_ELEMENTS,
new Object[]{
((SimpleNameClass)m.sampleDecl.getNameClass()).localName
});
// make this element name fresh
// so that the user won't see excessive error messages.
name2value.remove(en);
}
}
}
inSimpleElement = oldSE;
inOptionalChoice = oldOC;
inChoice = oldC;
inOneOrMore = oldOOM;
currentElementName = prevElemName;
currentAttributes = oldCA;
}
public void onOneOrMore( OneOrMoreExp exp ) {
final boolean oldOOM = inOneOrMore;
inOneOrMore = true;
exp.exp.visit(this);
inOneOrMore=oldOOM;
}
public void onChoice( ChoiceExp exp ) {
final boolean oldOC = inOptionalChoice;
final boolean oldC = inChoice;
inChoice = true;
if(!isEpsilon(exp.exp1) && !isEpsilon(exp.exp2))
inOptionalChoice = false;
super.onChoice(exp);
inOptionalChoice = oldOC;
inChoice = oldC;
}
public void onAttribute( AttributeExp exp ) {
if( defaultedAttributes.containsKey(exp) ) {
// this attribute has a default value.
if(!inOptionalChoice || !inChoice) {
reportCompError(
new Locator[]{reader.getDeclaredLocationOf(exp)},
CERR_DEFVALUE_NOT_OPTIONAL);
return; // abort
}
if(inOneOrMore) {
reportCompError(
new Locator[]{reader.getDeclaredLocationOf(exp)},
CERR_DEFVALUE_REPEATABLE);
return; // abort
}
if(!inSimpleElement) {
reportCompError(
new Locator[]{reader.getDeclaredLocationOf(exp)},
CERR_DEFVALUE_COMPLEX_ELEMENTNAME);
return; // abort
}
String value = (String)defaultedAttributes.get(exp);
String v = (String)currentAttributes.put(
new StringPair((SimpleNameClass)exp.nameClass), value );
if(v!=null) {
// make sure that this value and the previous value
// are the same
if(!v.equals(value))
reportCompError(
new Locator[]{reader.getDeclaredLocationOf(exp)},
CERR_DEFVALUE_DIFFERENT_VALUES,
new Object[]{v,value,
currentElementName.localName,
((SimpleNameClass)exp.nameClass).localName});
}
}
}
public void onList( ListExp exp ) {
// ListExp may never contain ElementExp nor AttributeExp,
// so visiting its children is nothing but a waste of time.
}
});
// test that the competing elements also has the same default values.
itr = elements.iterator();
while(itr.hasNext()) {
final ElementExp eexp = (ElementExp)itr.next();
NameClass nc = eexp.getNameClass();
if(!(nc instanceof SimpleNameClass)) {
// if the element has a complex name class,
// it cannot have a default attribute value.
// (this is checked within the first pass.
// so in this case, we just need to make sure that
// any competing elements do not have defaulted attributes.
Iterator jtr = name2value.entrySet().iterator();
while(jtr.hasNext()) {
Map.Entry e = (Map.Entry)jtr.next();
if(nc.accepts((StringPair)e.getKey())) {
// this element competes with this eexp.
DefAttMap defAtts = (DefAttMap)e.getValue();
if(defAtts.defaultAttributes.size()>0) {
// TODO: what should the error message be?
reportCompError(
new Locator[]{
reader.getDeclaredLocationOf(defAtts.sampleDecl),
reader.getDeclaredLocationOf(eexp)},
CERR_DEFVALUE_COMPETING_ELEMENTS,
new Object[]{
((SimpleNameClass)defAtts.sampleDecl.getNameClass()).localName
});
return; // abort the check
}
}
}
} /* else {
if the element has a simple name, then
all checks are done in the 1st pass.
} */
}
}
/**
* checks if the expression contains context-dependent datatypes.
* If so, it reports an error and throws an Abort exception.
*/
private ExpressionWalker contextDependentTypeChecker = new ExpressionWalker(){
public void onData( DataExp exp ) { check(exp.dt,exp.name); }
public void onValue( ValueExp exp ) { check(exp.dt,exp.name); }
private void check( Datatype dt, StringPair name ) {
if(dt.isContextDependent()) {
reportCompError(
null,
CERR_DEFVALUE_CONTEXT_DEPENDENT_TYPE,
new Object[]{name.localName});
throw new Abort();
}
}
};
public static final String CERR_DEFVALUE_NAME_IS_NOT_SIMPLE = // arg:0
"RELAXNGReader.Compatibility.DefaultValue.NameIsNotSimple";
public static final String CERR_DEFVALUE_INVALID = // arg:1
"RELAXNGReader.Compatibility.DefaultValue.Invalid";
public static final String CERR_DEFVALUE_NOT_OPTIONAL = // arg:0
"RELAXNGReader.Compatibility.DefaultValue.NotOptional";
public static final String CERR_DEFVALUE_REPEATABLE = // arg:0
"RELAXNGReader.Compatibility.DefaultValue.Repeatable";
public static final String CERR_DEFVALUE_COMPLEX_ELEMENTNAME = // arg:0
"RELAXNGReader.Compatibility.DefaultValue.ComplexElementName";
public static final String CERR_DEFVALUE_DIFFERENT_VALUES = // arg:4
"RELAXNGReader.Compatibility.DefaultValue.DifferentValues";
// public static final String CERR_DEFVALUE_POSSIBLY_UNCOMPATIBLE_TYPE = // arg:1
// "RELAXNGReader.Compatibility.DefaultValue.PossiblyUncompatibleType";
public static final String CERR_DEFVALUE_CONTEXT_DEPENDENT_TYPE = // arg:1
"RELAXNGReader.Compatibility.DefaultValue.ContextDependentType";
public static final String CERR_DEFVALUE_COMPETING_ELEMENTS = // arg:1
"RELAXNGReader.Compatibility.DefaultValue.CompetingElements";
}
