source: trunk/src/xmlpatterns/expr/qarithmeticexpression.cpp@ 117

Last change on this file since 117 was 2, checked in by Dmitry A. Kuminov, 16 years ago

Initially imported qt-all-opensource-src-4.5.1 from Trolltech.
File size: 13.7 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
4** Contact: Qt Software Information ([email protected])
5**
6** This file is part of the QtXmlPatterns module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial Usage
10** Licensees holding valid Qt Commercial licenses may use this file in
11** accordance with the Qt Commercial License Agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and Nokia.
14**
15** GNU Lesser General Public License Usage
16** Alternatively, this file may be used under the terms of the GNU Lesser
17** General Public License version 2.1 as published by the Free Software
18** Foundation and appearing in the file LICENSE.LGPL included in the
19** packaging of this file. Please review the following information to
20** ensure the GNU Lesser General Public License version 2.1 requirements
21** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
22**
23** In addition, as a special exception, Nokia gives you certain
24** additional rights. These rights are described in the Nokia Qt LGPL
25** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
26** package.
27**
28** GNU General Public License Usage
29** Alternatively, this file may be used under the terms of the GNU
30** General Public License version 3.0 as published by the Free Software
31** Foundation and appearing in the file LICENSE.GPL included in the
32** packaging of this file. Please review the following information to
33** ensure the GNU General Public License version 3.0 requirements will be
34** met: http://www.gnu.org/copyleft/gpl.html.
35**
36** If you are unsure which license is appropriate for your use, please
37** contact the sales department at [email protected].
38** $QT_END_LICENSE$
39**
40****************************************************************************/
41
42#include "qboolean_p.h"
43#include "qbuiltintypes_p.h"
44#include "qcommonsequencetypes_p.h"
45#include "qemptysequence_p.h"
46#include "qgenericsequencetype_p.h"
47#include "qliteral_p.h"
48#include "qpatternistlocale_p.h"
49#include "qschemanumeric_p.h"
50#include "quntypedatomicconverter_p.h"
51
52#include "qarithmeticexpression_p.h"
53
54QT_BEGIN_NAMESPACE
55
56using namespace QPatternist;
57
58ArithmeticExpression::ArithmeticExpression(const Expression::Ptr &op1,
59 const AtomicMathematician::Operator op,
60 const Expression::Ptr &op2) : PairContainer(op1, op2)
61 , m_op(op)
62 , m_isCompat(false)
63{
64}
65
66Item ArithmeticExpression::evaluateSingleton(const DynamicContext::Ptr &context) const
67{
68 const Item op1(m_operand1->evaluateSingleton(context));
69 if(!op1)
70 return Item();
71
72 const Item op2(m_operand2->evaluateSingleton(context));
73 if(!op2)
74 return Item();
75
76 return flexiblyCalculate(op1, m_op, op2, m_mather, context, this,
77 ReportContext::XPTY0004, m_isCompat);
78}
79
80/**
81 * Since ArithmeticExpression::flexiblyCalculate() creates Expression instances
82 * at runtime, we have the problem of having SourceLocationReflections for them
83 * in the case that we run into a runtime error, since the locations are always
84 * located at compile time.
85 *
86 * This class simply delegates the reflection over to an existing expression.
87 *
88 * I only managed to trigger this with "current() + 1", where current()
89 * evaluates to an invalid representation for @c xs:double.
90 *
91 * @since 4.5
92 * @author Frans Englich <[email protected]>
93 */
94class DelegatingReflectionExpression : public Literal
95{
96public:
97 DelegatingReflectionExpression(const Item &item,
98 const SourceLocationReflection *const reflection) : Literal(item)
99 , m_reflection(reflection)
100 {
101 }
102
103 virtual const SourceLocationReflection *actualReflection() const
104 {
105 return m_reflection;
106 }
107
108private:
109 const SourceLocationReflection *const m_reflection;
110};
111
112Item ArithmeticExpression::flexiblyCalculate(const Item &op1,
113 const AtomicMathematician::Operator op,
114 const Item &op2,
115 const AtomicMathematician::Ptr &mather,
116 const DynamicContext::Ptr &context,
117 const SourceLocationReflection *const reflection,
118 const ReportContext::ErrorCode code,
119 const bool isCompat)
120{
121 if(mather)
122 return mather->calculate(op1, op, op2, context);
123
124 /* This is a very heavy code path. */
125 Expression::Ptr a1(new DelegatingReflectionExpression(op1, reflection));
126 Expression::Ptr a2(new DelegatingReflectionExpression(op2, reflection));
127
128 const AtomicMathematician::Ptr ingela(fetchMathematician(a1, a2, op, true, context, reflection, code, isCompat));
129
130 return ingela->calculate(a1->evaluateSingleton(context),
131 op,
132 a2->evaluateSingleton(context),
133 context);
134}
135
136Expression::Ptr ArithmeticExpression::typeCheck(const StaticContext::Ptr &context,
137 const SequenceType::Ptr &reqType)
138{
139 m_isCompat = context->compatModeEnabled();
140
141 const Expression::Ptr me(PairContainer::typeCheck(context, reqType));
142 const ItemType::Ptr t1(m_operand1->staticType()->itemType());
143 const ItemType::Ptr t2(m_operand2->staticType()->itemType());
144
145 if(*CommonSequenceTypes::Empty == *t1 ||
146 *CommonSequenceTypes::Empty == *t2)
147 {
148 return EmptySequence::create(this, context);
149 }
150
151 if(*BuiltinTypes::xsAnyAtomicType == *t1 ||
152 *BuiltinTypes::xsAnyAtomicType == *t2 ||
153 *BuiltinTypes::numeric == *t1 ||
154 *BuiltinTypes::numeric == *t2)
155 {
156 /* The static type of (at least) one of the operands could not
157 * be narrowed further than xs:anyAtomicType, so we do the operator
158 * lookup at runtime. */
159 return me;
160 }
161
162 m_mather = fetchMathematician(m_operand1, m_operand2, m_op, true, context, this,
163 ReportContext::XPTY0004, m_isCompat);
164
165 return me;
166}
167
168AtomicMathematician::Ptr
169ArithmeticExpression::fetchMathematician(Expression::Ptr &op1,
170 Expression::Ptr &op2,
171 const AtomicMathematician::Operator op,
172 const bool issueError,
173 const ReportContext::Ptr &context,
174 const SourceLocationReflection *const reflection,
175 const ReportContext::ErrorCode code,
176 const bool isCompat)
177{
178 ItemType::Ptr t1(op1->staticType()->itemType());
179 ItemType::Ptr t2(op2->staticType()->itemType());
180
181 if(BuiltinTypes::xsUntypedAtomic->xdtTypeMatches(t1)
182 || (isCompat && (BuiltinTypes::xsString->xdtTypeMatches(t1)
183 || BuiltinTypes::xsDecimal->xdtTypeMatches(t1))))
184 {
185 op1 = Expression::Ptr(new UntypedAtomicConverter(op1, BuiltinTypes::xsDouble));
186 /* The types might have changed, reload. */
187 t1 = op1->staticType()->itemType();
188 }
189
190 if(BuiltinTypes::xsUntypedAtomic->xdtTypeMatches(t2)
191 || (isCompat && (BuiltinTypes::xsString->xdtTypeMatches(t1)
192 || BuiltinTypes::xsDecimal->xdtTypeMatches(t1))))
193 {
194 op2 = Expression::Ptr(new UntypedAtomicConverter(op2, BuiltinTypes::xsDouble));
195 /* The types might have changed, reload. */
196 t2 = op2->staticType()->itemType();
197 }
198
199 const AtomicMathematicianLocator::Ptr locator
200 (static_cast<const AtomicType *>(t1.data())->mathematicianLocator());
201
202 if(!locator)
203 {
204 if(!issueError)
205 return AtomicMathematician::Ptr();
206
207 context->error(QtXmlPatterns::tr(
208 "Operator %1 cannot be used on type %2.")
209 .arg(formatKeyword(AtomicMathematician::displayName(op)))
210 .arg(formatType(context->namePool(), t1)),
211 code, reflection);
212 return AtomicMathematician::Ptr();
213 }
214
215 const AtomicMathematician::Ptr comp
216 (static_cast<const AtomicType *>(t2.data())->accept(locator, op, reflection));
217
218 if(comp)
219 return comp;
220
221 if(!issueError)
222 return AtomicMathematician::Ptr();
223
224 context->error(QtXmlPatterns::tr("Operator %1 cannot be used on "
225 "atomic values of type %2 and %3.")
226 .arg(formatKeyword(AtomicMathematician::displayName(op)))
227 .arg(formatType(context->namePool(), t1))
228 .arg(formatType(context->namePool(), t2)),
229 code, reflection);
230 return AtomicMathematician::Ptr();
231}
232
233SequenceType::Ptr ArithmeticExpression::staticType() const
234{
235 Cardinality card;
236
237 /* These variables are important because they ensure staticType() only
238 * gets called once from this function. Before, this lead to strange
239 * semi-infinite recursion involving many arithmetic expressions. */
240 const SequenceType::Ptr st1(m_operand1->staticType());
241 const SequenceType::Ptr st2(m_operand2->staticType());
242
243 if(st1->cardinality().allowsEmpty() ||
244 st2->cardinality().allowsEmpty())
245 {
246 card = Cardinality::zeroOrOne();
247 }
248 else
249 card = Cardinality::exactlyOne();
250
251 if(m_op == AtomicMathematician::IDiv)
252 return makeGenericSequenceType(BuiltinTypes::xsInteger, card);
253
254 const ItemType::Ptr t1(st1->itemType());
255 const ItemType::Ptr t2(st2->itemType());
256 ItemType::Ptr returnType;
257
258 /* Please, make this beautiful? */
259 if(BuiltinTypes::xsTime->xdtTypeMatches(t1) ||
260 BuiltinTypes::xsDate->xdtTypeMatches(t1) ||
261 BuiltinTypes::xsDateTime->xdtTypeMatches(t1))
262 {
263 if(BuiltinTypes::xsDuration->xdtTypeMatches(t2))
264 returnType = t1;
265 else
266 returnType = BuiltinTypes::xsDayTimeDuration;
267 }
268 else if(BuiltinTypes::xsYearMonthDuration->xdtTypeMatches(t1))
269 {
270 if(m_op == AtomicMathematician::Div &&
271 BuiltinTypes::xsYearMonthDuration->xdtTypeMatches(t2))
272 {
273 returnType = BuiltinTypes::xsDecimal;
274 }
275 else if(BuiltinTypes::numeric->xdtTypeMatches(t2))
276 returnType = BuiltinTypes::xsYearMonthDuration;
277 else
278 returnType = t2;
279 }
280 else if(BuiltinTypes::xsYearMonthDuration->xdtTypeMatches(t2))
281 {
282 returnType = BuiltinTypes::xsYearMonthDuration;
283 }
284 else if(BuiltinTypes::xsDayTimeDuration->xdtTypeMatches(t1))
285 {
286 if(m_op == AtomicMathematician::Div &&
287 BuiltinTypes::xsDayTimeDuration->xdtTypeMatches(t2))
288 {
289 returnType = BuiltinTypes::xsDecimal;
290 }
291 else if(BuiltinTypes::numeric->xdtTypeMatches(t2))
292 returnType = BuiltinTypes::xsDayTimeDuration;
293 else
294 returnType = t2;
295 }
296 else if(BuiltinTypes::xsDayTimeDuration->xdtTypeMatches(t2))
297 {
298 returnType = BuiltinTypes::xsDayTimeDuration;
299 }
300 else if(BuiltinTypes::xsDouble->xdtTypeMatches(t1) ||
301 BuiltinTypes::xsDouble->xdtTypeMatches(t2))
302 {
303 returnType = BuiltinTypes::xsDouble;
304 }
305 else if(BuiltinTypes::xsFloat->xdtTypeMatches(t1) ||
306 BuiltinTypes::xsFloat->xdtTypeMatches(t2))
307 {
308 if(m_isCompat)
309 returnType = BuiltinTypes::xsFloat;
310 else
311 returnType = BuiltinTypes::xsDouble;
312 }
313 else if(BuiltinTypes::xsInteger->xdtTypeMatches(t1) &&
314 BuiltinTypes::xsInteger->xdtTypeMatches(t2))
315 {
316 if(m_isCompat)
317 returnType = BuiltinTypes::xsDouble;
318 else
319 {
320 /* "A div B numeric numeric op:numeric-divide(A, B)
321 * numeric; but xs:decimal if both operands are xs:integer" */
322 if(m_op == AtomicMathematician::Div)
323 returnType = BuiltinTypes::xsDecimal;
324 else
325 returnType = BuiltinTypes::xsInteger;
326 }
327 }
328 else if(m_isCompat && (BuiltinTypes::xsInteger->xdtTypeMatches(t1) &&
329 BuiltinTypes::xsInteger->xdtTypeMatches(t2)))
330 {
331 returnType = BuiltinTypes::xsDouble;
332 }
333 else
334 {
335 /* If typeCheck() has been called, our operands conform to expectedOperandTypes(), and
336 * the types are hence either xs:decimals, or xs:anyAtomicType(meaning the static type could
337 * not be inferred), or empty-sequence(). So we use the union of the two types. The combinations
338 * could also be wrong.*/
339 returnType = t1 | t2;
340
341 /* However, if we're called before typeCheck(), we could potentially have nodes, so we need to make
342 * sure that the type is at least atomic. */
343 if(!BuiltinTypes::xsAnyAtomicType->xdtTypeMatches(returnType))
344 returnType = BuiltinTypes::xsAnyAtomicType;
345 }
346
347 return makeGenericSequenceType(returnType, card);
348}
349
350SequenceType::List ArithmeticExpression::expectedOperandTypes() const
351{
352 SequenceType::List result;
353 result.append(CommonSequenceTypes::ZeroOrOneAtomicType);
354 result.append(CommonSequenceTypes::ZeroOrOneAtomicType);
355 return result;
356}
357
358ExpressionVisitorResult::Ptr ArithmeticExpression::accept(const ExpressionVisitor::Ptr &visitor) const
359{
360 return visitor->visit(this);
361}
362
363QT_END_NAMESPACE
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