summaryrefslogtreecommitdiffstats
path: root/src/xmlpatterns/expr/qarithmeticexpression.cpp
blob: 5110866ea7d8bd0052e2dc445101acb1d2d6929e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qboolean_p.h"
#include "qbuiltintypes_p.h"
#include "qcommonsequencetypes_p.h"
#include "qemptysequence_p.h"
#include "qgenericsequencetype_p.h"
#include "qliteral_p.h"
#include "qpatternistlocale_p.h"
#include "qschemanumeric_p.h"
#include "quntypedatomicconverter_p.h"

#include "qarithmeticexpression_p.h"

QT_BEGIN_NAMESPACE

using namespace QPatternist;

ArithmeticExpression::ArithmeticExpression(const Expression::Ptr &op1,
                                           const AtomicMathematician::Operator op,
                                           const Expression::Ptr &op2) : PairContainer(op1, op2)
                                                                       , m_op(op)
                                                                       , m_isCompat(false)
{
}

Item ArithmeticExpression::evaluateSingleton(const DynamicContext::Ptr &context) const
{
    const Item op1(m_operand1->evaluateSingleton(context));
    if(!op1)
        return Item();

    const Item op2(m_operand2->evaluateSingleton(context));
    if(!op2)
        return Item();

    return flexiblyCalculate(op1, m_op, op2, m_mather, context, this,
                             ReportContext::XPTY0004, m_isCompat);
}

/**
 * Since ArithmeticExpression::flexiblyCalculate() creates Expression instances
 * at runtime, we have the problem of having SourceLocationReflections for them
 * in the case that we run into a runtime error, since the locations are always
 * located at compile time.
 *
 * This class simply delegates the reflection over to an existing expression.
 *
 * I only managed to trigger this with "current() + 1", where current()
 * evaluates to an invalid representation for @c xs:double.
 *
 * @since 4.5
 * @author Frans Englich <fenglich@trolltech.com>
 */
class DelegatingReflectionExpression : public Literal
{
public:
    DelegatingReflectionExpression(const Item &item,
                                   const SourceLocationReflection *const reflection) : Literal(item)
                                                                                     , m_reflection(reflection)
    {
    }

    virtual const SourceLocationReflection *actualReflection() const
    {
        return m_reflection;
    }

private:
    const SourceLocationReflection *const m_reflection;
};

Item ArithmeticExpression::flexiblyCalculate(const Item &op1,
                                             const AtomicMathematician::Operator op,
                                             const Item &op2,
                                             const AtomicMathematician::Ptr &mather,
                                             const DynamicContext::Ptr &context,
                                             const SourceLocationReflection *const reflection,
                                             const ReportContext::ErrorCode code,
                                             const bool isCompat)
{
    if(mather)
        return mather->calculate(op1, op, op2, context);

    /* This is a very heavy code path. */
    Expression::Ptr a1(new DelegatingReflectionExpression(op1, reflection));
    Expression::Ptr a2(new DelegatingReflectionExpression(op2, reflection));

    const AtomicMathematician::Ptr ingela(fetchMathematician(a1, a2, op, true, context, reflection, code, isCompat));

    return ingela->calculate(a1->evaluateSingleton(context),
                             op,
                             a2->evaluateSingleton(context),
                             context);
}

Expression::Ptr ArithmeticExpression::typeCheck(const StaticContext::Ptr &context,
                                                const SequenceType::Ptr &reqType)
{
    m_isCompat = context->compatModeEnabled();

    const Expression::Ptr me(PairContainer::typeCheck(context, reqType));
    const ItemType::Ptr t1(m_operand1->staticType()->itemType());
    const ItemType::Ptr t2(m_operand2->staticType()->itemType());

    if(*CommonSequenceTypes::Empty == *t1 ||
       *CommonSequenceTypes::Empty == *t2)
    {
        return EmptySequence::create(this, context);
    }

    if(*BuiltinTypes::xsAnyAtomicType == *t1    ||
       *BuiltinTypes::xsAnyAtomicType == *t2    ||
       *BuiltinTypes::numeric == *t1            ||
       *BuiltinTypes::numeric == *t2)
    {
        /* The static type of (at least) one of the operands could not
         * be narrowed further than xs:anyAtomicType, so we do the operator
         * lookup at runtime. */
        return me;
    }

    m_mather = fetchMathematician(m_operand1, m_operand2, m_op, true, context, this,
                                  ReportContext::XPTY0004, m_isCompat);

    return me;
}

AtomicMathematician::Ptr
ArithmeticExpression::fetchMathematician(Expression::Ptr &op1,
                                         Expression::Ptr &op2,
                                         const AtomicMathematician::Operator op,
                                         const bool issueError,
                                         const ReportContext::Ptr &context,
                                         const SourceLocationReflection *const reflection,
                                         const ReportContext::ErrorCode code,
                                         const bool isCompat)
{
    ItemType::Ptr t1(op1->staticType()->itemType());
    ItemType::Ptr t2(op2->staticType()->itemType());

    if(BuiltinTypes::xsUntypedAtomic->xdtTypeMatches(t1)
       || (isCompat && (BuiltinTypes::xsString->xdtTypeMatches(t1)
                        || BuiltinTypes::xsDecimal->xdtTypeMatches(t1))))
    {
        op1 = Expression::Ptr(new UntypedAtomicConverter(op1, BuiltinTypes::xsDouble));
        /* The types might have changed, reload. */
        t1 = op1->staticType()->itemType();
    }

    if(BuiltinTypes::xsUntypedAtomic->xdtTypeMatches(t2)
       || (isCompat && (BuiltinTypes::xsString->xdtTypeMatches(t1)
                        || BuiltinTypes::xsDecimal->xdtTypeMatches(t1))))
    {
        op2 = Expression::Ptr(new UntypedAtomicConverter(op2, BuiltinTypes::xsDouble));
        /* The types might have changed, reload. */
        t2 = op2->staticType()->itemType();
    }

    const AtomicMathematicianLocator::Ptr locator
        (static_cast<const AtomicType *>(t1.data())->mathematicianLocator());

    if(!locator)
    {
        if(!issueError)
            return AtomicMathematician::Ptr();

        context->error(QtXmlPatterns::tr(
                       "Operator %1 cannot be used on type %2.")
                       .arg(formatKeyword(AtomicMathematician::displayName(op)))
                       .arg(formatType(context->namePool(), t1)),
                       code, reflection);
        return AtomicMathematician::Ptr();
    }

    const AtomicMathematician::Ptr comp
        (static_cast<const AtomicType *>(t2.data())->accept(locator, op, reflection));

    if(comp)
        return comp;

    if(!issueError)
        return AtomicMathematician::Ptr();

    context->error(QtXmlPatterns::tr("Operator %1 cannot be used on "
                                     "atomic values of type %2 and %3.")
                   .arg(formatKeyword(AtomicMathematician::displayName(op)))
                   .arg(formatType(context->namePool(), t1))
                   .arg(formatType(context->namePool(), t2)),
                   code, reflection);
    return AtomicMathematician::Ptr();
}

SequenceType::Ptr ArithmeticExpression::staticType() const
{
    Cardinality card;

    /* These variables are important because they ensure staticType() only
     * gets called once from this function. Before, this lead to strange
     * semi-infinite recursion involving many arithmetic expressions. */
    const SequenceType::Ptr st1(m_operand1->staticType());
    const SequenceType::Ptr st2(m_operand2->staticType());

    if(st1->cardinality().allowsEmpty() ||
       st2->cardinality().allowsEmpty())
    {
        card = Cardinality::zeroOrOne();
    }
    else
        card = Cardinality::exactlyOne();

    if(m_op == AtomicMathematician::IDiv)
        return makeGenericSequenceType(BuiltinTypes::xsInteger, card);

    const ItemType::Ptr t1(st1->itemType());
    const ItemType::Ptr t2(st2->itemType());
    ItemType::Ptr returnType;

    /* Please, make this beautiful? */
    if(BuiltinTypes::xsTime->xdtTypeMatches(t1) ||
       BuiltinTypes::xsDate->xdtTypeMatches(t1) ||
       BuiltinTypes::xsDateTime->xdtTypeMatches(t1))
    {
        if(BuiltinTypes::xsDuration->xdtTypeMatches(t2))
            returnType = t1;
        else
            returnType = BuiltinTypes::xsDayTimeDuration;
    }
    else if(BuiltinTypes::xsYearMonthDuration->xdtTypeMatches(t1))
    {
        if(m_op == AtomicMathematician::Div &&
           BuiltinTypes::xsYearMonthDuration->xdtTypeMatches(t2))
        {
            returnType = BuiltinTypes::xsDecimal;
        }
        else if(BuiltinTypes::numeric->xdtTypeMatches(t2))
            returnType = BuiltinTypes::xsYearMonthDuration;
        else
            returnType = t2;
    }
    else if(BuiltinTypes::xsYearMonthDuration->xdtTypeMatches(t2))
    {
        returnType = BuiltinTypes::xsYearMonthDuration;
    }
    else if(BuiltinTypes::xsDayTimeDuration->xdtTypeMatches(t1))
    {
        if(m_op == AtomicMathematician::Div &&
           BuiltinTypes::xsDayTimeDuration->xdtTypeMatches(t2))
        {
            returnType = BuiltinTypes::xsDecimal;
        }
        else if(BuiltinTypes::numeric->xdtTypeMatches(t2))
            returnType = BuiltinTypes::xsDayTimeDuration;
        else
            returnType = t2;
    }
    else if(BuiltinTypes::xsDayTimeDuration->xdtTypeMatches(t2))
    {
        returnType = BuiltinTypes::xsDayTimeDuration;
    }
    else if(BuiltinTypes::xsDouble->xdtTypeMatches(t1) ||
            BuiltinTypes::xsDouble->xdtTypeMatches(t2))
    {
        returnType = BuiltinTypes::xsDouble;
    }
    else if(BuiltinTypes::xsFloat->xdtTypeMatches(t1) ||
            BuiltinTypes::xsFloat->xdtTypeMatches(t2))
    {
        if(m_isCompat)
            returnType = BuiltinTypes::xsFloat;
        else
            returnType = BuiltinTypes::xsDouble;
    }
    else if(BuiltinTypes::xsInteger->xdtTypeMatches(t1) &&
            BuiltinTypes::xsInteger->xdtTypeMatches(t2))
    {
        if(m_isCompat)
            returnType = BuiltinTypes::xsDouble;
        else
        {
            /* "A div B  numeric  numeric  op:numeric-divide(A, B)
             * numeric; but xs:decimal if both operands are xs:integer" */
            if(m_op == AtomicMathematician::Div)
                returnType = BuiltinTypes::xsDecimal;
            else
                returnType = BuiltinTypes::xsInteger;
        }
    }
    else if(m_isCompat && (BuiltinTypes::xsInteger->xdtTypeMatches(t1) &&
                           BuiltinTypes::xsInteger->xdtTypeMatches(t2)))
    {
        returnType = BuiltinTypes::xsDouble;
    }
    else
    {
        /* If typeCheck() has been called, our operands conform to expectedOperandTypes(), and
         * the types are hence either xs:decimals, or xs:anyAtomicType(meaning the static type could
         * not be inferred), or empty-sequence(). So we use the union of the two types. The combinations
         * could also be wrong.*/
        returnType = t1 | t2;

        /* However, if we're called before typeCheck(), we could potentially have nodes, so we need to make
         * sure that the type is at least atomic. */
        if(!BuiltinTypes::xsAnyAtomicType->xdtTypeMatches(returnType))
            returnType = BuiltinTypes::xsAnyAtomicType;
    }

    return makeGenericSequenceType(returnType, card);
}

SequenceType::List ArithmeticExpression::expectedOperandTypes() const
{
    SequenceType::List result;
    result.append(CommonSequenceTypes::ZeroOrOneAtomicType);
    result.append(CommonSequenceTypes::ZeroOrOneAtomicType);
    return result;
}

ExpressionVisitorResult::Ptr ArithmeticExpression::accept(const ExpressionVisitor::Ptr &visitor) const
{
    return visitor->visit(this);
}

QT_END_NAMESPACE