Fix XML schema validation failure.

Checking constraining facets for double failed if enumeration
restriction had values INF or NaN.

There were two issues that caused validation to fail:
- wrong conversion function was used when constraining facets for
 double are checked, which caused values to be in lower case
- case when both restriction and default value are NaN was not
 handled correctly

Task-number: QTBUG-21375
Reviewed-by: Honglei Zhang

3 files changed, 52 insertions, 1 deletions

diff --git a/src/xmlpatterns/schema/qxsdtypechecker.cpp b/src/xmlpatterns/schema/qxsdtypechecker.cpp
index fb47448..e5709ae 100644
--- a/src/xmlpatterns/schema/qxsdtypechecker.cpp
+++ b/src/xmlpatterns/schema/qxsdtypechecker.cpp
@@ -57,6 +57,7 @@
 #include "qxsdschemahelper_p.h"
 #include "qxsdschemamerger_p.h"
 #include "qxsdstatemachine_p.h"
+#include "qabstractfloat_p.h"
 
 #include "qxsdschemadebugger_p.h"
 
@@ -697,7 +698,8 @@ bool XsdTypeChecker::checkConstrainingFacetsDouble(double value, const QString &
     }
     if (facets.contains(XsdFacet::Enumeration)) {
         const XsdFacet::Ptr facet = facets.value(XsdFacet::Enumeration);
-        const DerivedString<TypeString>::Ptr valueStr = DerivedString<TypeString>::fromLexical(m_namePool, QString::number(value));
+        const Numeric::Ptr valuePtr = Double::fromValue(value);
+        const DerivedString<TypeString>::Ptr valueStr = DerivedString<TypeString>::fromLexical(m_namePool, valuePtr->stringValue());
 
         const AtomicValue::List multiValue = facet->multiValue();
         bool found = false;
@@ -706,6 +708,13 @@ bool XsdTypeChecker::checkConstrainingFacetsDouble(double value, const QString &
                 found = true;
                 break;
             }
+
+            // Handle case when both facet and value are NaN separately as equals for NaN returns always false.
+            const Numeric::Ptr facetValue = ValueFactory::fromLexical(multiValue.at(j)->as<DerivedString<TypeString> >()->stringValue(), BuiltinTypes::xsDouble, m_context, m_reflection);
+            if (facetValue->isNaN() && valuePtr->isNaN()) {
+                found = true;
+                break;
+            }
         }
 
         if (!found) {
diff --git a/tests/auto/xmlpatternsvalidator/files/schema-with-restrictions.xsd b/tests/auto/xmlpatternsvalidator/files/schema-with-restrictions.xsd
new file mode 100644
index 0000000..532efcb
--- /dev/null
+++ b/tests/auto/xmlpatternsvalidator/files/schema-with-restrictions.xsd
@@ -0,0 +1,37 @@
+<?xml version="1.0"?>
+<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
+    <xsd:annotation>
+        <xsd:documentation xml:lang="en">
+            Test for QTBUG-21375: xmlpatternsvalidator does not allow for non-numeric literals in xsd:double attributes
+        </xsd:documentation>
+    </xsd:annotation>
+
+    <xsd:element name="test1" type="TestType1" />
+    <xsd:element name="test2" type="TestType2" />
+    <xsd:element name="test3" type="TestType3" />
+
+    <xsd:complexType name="TestType1">
+        <xsd:attribute name="attribute1" type="DoubleWithRestrictions" default="INF" />
+    </xsd:complexType>
+
+    <xsd:complexType name="TestType2">
+        <xsd:attribute name="attribute2" type="DoubleWithRestrictions" default="-INF" />
+    </xsd:complexType>
+
+    <xsd:complexType name="TestType3">
+        <xsd:attribute name="attribute3" type="DoubleWithRestrictions" default="NaN" />
+    </xsd:complexType>
+
+    <xsd:simpleType name="DoubleWithRestrictions">
+        <xsd:union>
+            <xsd:simpleType>
+                <xsd:restriction base="xsd:double">
+                    <xsd:enumeration value="-INF" />
+                    <xsd:enumeration value="INF" />
+                    <xsd:enumeration value="NaN" />
+                </xsd:restriction>
+            </xsd:simpleType>
+        </xsd:union>
+    </xsd:simpleType>
+
+</xsd:schema>
diff --git a/tests/auto/xmlpatternsvalidator/tst_xmlpatternsvalidator.cpp b/tests/auto/xmlpatternsvalidator/tst_xmlpatternsvalidator.cpp
index 817ea1a..60c1fe8 100644
--- a/tests/auto/xmlpatternsvalidator/tst_xmlpatternsvalidator.cpp
+++ b/tests/auto/xmlpatternsvalidator/tst_xmlpatternsvalidator.cpp
@@ -222,6 +222,11 @@ void tst_XmlPatternsValidator::xsdSupport_data() const
         << (QStringList() << QLatin1String("files/dateTime-with-microseconds.xml")
                           << QLatin1String("files/dateTime-with-microseconds.xsd"))
         << QString();
+
+    QTest::newRow("QTBUG-21375 A schema with a xs:double based simple type with non-numeric restrictions")
+        << 0
+        << (QStringList() << QLatin1String("files/schema-with-restrictions.xsd"))
+        << QString();
 }
 
 QTEST_MAIN(tst_XmlPatternsValidator)