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39
40//
41// W A R N I N G
42// -------------
43//
44// This file is not part of the Qt API. It exists purely as an
45// implementation detail. This header file may change from version to
46// version without notice, or even be removed.
47//
48// We mean it.
49//
50
51/**
52 * @file
53 * @short This file is included by qcastingplatform_p.h.
54 * If you need includes in this file, put them in CasttingPlatform.h, outside of the namespace.
55 */
56
57template <typename TSubClass, const bool issueError>
58Item CastingPlatform<TSubClass, issueError>::castWithCaster(const Item &sourceValue,
59 const AtomicCaster::Ptr &caster,
60 const ReportContext::Ptr &context) const
61{
62 Q_ASSERT(sourceValue);
63 Q_ASSERT(caster);
64 Q_ASSERT(context);
65
66 const Item retval(caster->castFrom(from: sourceValue, context));
67
68 if(issueError)
69 {
70 if(retval.template as<AtomicValue>()->hasError())
71 {
72 issueCastError(validationError: retval, sourceValue, context);
73 return Item();
74 }
75 else
76 return retval;
77 }
78 else
79 return retval;
80}
81
82template <typename TSubClass, const bool issueError>
83Item CastingPlatform<TSubClass, issueError>::cast(const Item &sourceValue,
84 const ReportContext::Ptr &context) const
85{
86 Q_ASSERT(sourceValue);
87 Q_ASSERT(context);
88 Q_ASSERT(targetType());
89
90 if(m_caster)
91 return castWithCaster(sourceValue, m_caster, context);
92 else
93 {
94 bool castImpossible = false;
95 const AtomicCaster::Ptr caster(locateCaster(sourceType: sourceValue.type(), context, castImpossible, location: static_cast<const TSubClass *>(this), targetType: targetType()));
96
97 if(!issueError && castImpossible)
98 {
99 /* If we're supposed to issue an error(issueError) then this
100 * line will never be reached, because locateCaster() will in
101 * that case throw. */
102 return ValidationError::createError();
103 }
104 else
105 return castWithCaster(sourceValue, caster, context);
106 }
107}
108
109template <typename TSubClass, const bool issueError>
110bool CastingPlatform<TSubClass, issueError>::prepareCasting(const ReportContext::Ptr &context,
111 const ItemType::Ptr &sourceType)
112{
113 Q_ASSERT(sourceType);
114 Q_ASSERT(context);
115
116 if(*sourceType == *BuiltinTypes::xsAnyAtomicType ||
117 *sourceType == *BuiltinTypes::item ||
118 *sourceType == *CommonSequenceTypes::Empty ||
119 *sourceType == *BuiltinTypes::numeric)
120 return true; /* The type could not be narrowed better than xs:anyAtomicType
121 or numeric at compile time. We'll do lookup at runtime instead. */
122
123 bool castImpossible = false;
124 m_caster = locateCaster(sourceType, context, castImpossible, location: static_cast<const TSubClass *>(this), targetType: targetType());
125
126 return !castImpossible;
127}
128
129template <typename TSubClass, const bool issueError>
130AtomicCaster::Ptr CastingPlatform<TSubClass, issueError>::locateCaster(const ItemType::Ptr &sourceType,
131 const ReportContext::Ptr &context,
132 bool &castImpossible,
133 const SourceLocationReflection *const location,
134 const ItemType::Ptr &targetType)
135{
136 Q_ASSERT(sourceType);
137 Q_ASSERT(targetType);
138
139 const AtomicCasterLocator::Ptr locator(static_cast<AtomicType *>(
140 targetType.data())->casterLocator());
141 if(!locator)
142 {
143 if(issueError)
144 {
145 context->error(message: QtXmlPatterns::tr(sourceText: "No casting is possible with %1 as the target type.")
146 .arg(a: formatType(np: context->namePool(), type: targetType)),
147 errorCode: ReportContext::XPTY0004, reflection: location);
148 }
149 else
150 castImpossible = true;
151
152 return AtomicCaster::Ptr();
153 }
154
155 const AtomicCaster::Ptr caster(static_cast<const AtomicType *>(sourceType.data())->accept(visitor: locator, location));
156 if(!caster)
157 {
158 if(issueError)
159 {
160 context->error(message: QtXmlPatterns::tr(sourceText: "It is not possible to cast from %1 to %2.")
161 .arg(a: formatType(np: context->namePool(), type: sourceType))
162 .arg(a: formatType(np: context->namePool(), type: targetType)),
163 errorCode: ReportContext::XPTY0004, reflection: location);
164 }
165 else
166 castImpossible = true;
167
168 return AtomicCaster::Ptr();
169 }
170
171 return caster;
172}
173
174template <typename TSubClass, const bool issueError>
175void CastingPlatform<TSubClass, issueError>::checkTargetType(const ReportContext::Ptr &context) const
176{
177 Q_ASSERT(context);
178
179 const ItemType::Ptr tType(targetType());
180 Q_ASSERT(tType);
181 Q_ASSERT(tType->isAtomicType());
182 const AtomicType::Ptr asAtomic(tType);
183
184 /* This catches casting to xs:NOTATION and xs:anyAtomicType. */
185 if(asAtomic->isAbstract())
186 {
187 context->error(QtXmlPatterns::tr(sourceText: "Casting to %1 is not possible because it "
188 "is an abstract type, and can therefore never be instantiated.")
189 .arg(a: formatType(np: context->namePool(), type: tType)),
190 ReportContext::XPST0080,
191 static_cast<const TSubClass*>(this));
192 }
193}
194
195template <typename TSubClass, const bool issueError>
196void CastingPlatform<TSubClass, issueError>::issueCastError(const Item &validationError,
197 const Item &sourceValue,
198 const ReportContext::Ptr &context) const
199{
200 Q_ASSERT(validationError);
201 Q_ASSERT(context);
202 Q_ASSERT(validationError.isAtomicValue());
203 Q_ASSERT(validationError.template as<AtomicValue>()->hasError());
204
205 const ValidationError::Ptr err(validationError.template as<ValidationError>());
206 QString msg(err->message());
207
208 if(msg.isNull())
209 {
210 msg = QtXmlPatterns::tr(sourceText: "It's not possible to cast the value %1 of type %2 to %3")
211 .arg(a: formatData(data: sourceValue.stringValue()))
212 .arg(a: formatType(np: context->namePool(), type: sourceValue.type()))
213 .arg(formatType(context->namePool(), targetType()));
214 }
215 else
216 {
217 Q_ASSERT(!msg.isEmpty());
218 msg = QtXmlPatterns::tr(sourceText: "Failure when casting from %1 to %2: %3")
219 .arg(a: formatType(np: context->namePool(), type: sourceValue.type()))
220 .arg(formatType(context->namePool(), targetType()))
221 .arg(msg);
222 }
223
224 /* If m_errorCode is FORG0001, we assume our sub-classer doesn't have a
225 * special wish about error code, so then we use the error object's code.
226 */
227 context->error(msg, m_errorCode == ReportContext::FORG0001 ? err->errorCode() : m_errorCode,
228 static_cast<const TSubClass*>(this));
229}
230
231

source code of qtxmlpatterns/src/xmlpatterns/expr/qcastingplatform_tpl_p.h