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1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 : /* This Source Code Form is subject to the terms of the Mozilla Public
3 : * License, v. 2.0. If a copy of the MPL was not distributed with this
4 : * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5 :
6 : #ifndef TRANSFRMX_XPATHRESULTCOMPARATOR_H
7 : #define TRANSFRMX_XPATHRESULTCOMPARATOR_H
8 :
9 : #include "mozilla/Attributes.h"
10 : #include "txCore.h"
11 : #include "nsCOMPtr.h"
12 : #include "nsICollation.h"
13 : #include "nsString.h"
14 :
15 : class Expr;
16 : class txIEvalContext;
17 :
18 : /*
19 : * Result comparators
20 : */
21 0 : class txXPathResultComparator
22 : {
23 : public:
24 0 : virtual ~txXPathResultComparator()
25 0 : {
26 0 : }
27 :
28 : /*
29 : * Compares two XPath results. Returns -1 if val1 < val2,
30 : * 1 if val1 > val2 and 0 if val1 == val2.
31 : */
32 : virtual int compareValues(txObject* val1, txObject* val2) = 0;
33 :
34 : /*
35 : * Create a sortable value.
36 : */
37 : virtual nsresult createSortableValue(Expr *aExpr, txIEvalContext *aContext,
38 : txObject *&aResult) = 0;
39 : };
40 :
41 : /*
42 : * Compare results as stings (data-type="text")
43 : */
44 0 : class txResultStringComparator : public txXPathResultComparator
45 : {
46 : public:
47 : txResultStringComparator(bool aAscending, bool aUpperFirst,
48 : const nsString& aLanguage);
49 :
50 : int compareValues(txObject* aVal1, txObject* aVal2) override;
51 : nsresult createSortableValue(Expr *aExpr, txIEvalContext *aContext,
52 : txObject *&aResult) override;
53 : private:
54 : nsCOMPtr<nsICollation> mCollation;
55 : nsresult init(const nsString& aLanguage);
56 : nsresult createRawSortKey(const int32_t aStrength,
57 : const nsString& aString,
58 : uint8_t** aKey,
59 : uint32_t* aLength);
60 : int mSorting;
61 :
62 : class StringValue : public txObject
63 : {
64 : public:
65 : StringValue();
66 : ~StringValue();
67 :
68 : uint8_t* mKey;
69 : void* mCaseKey;
70 : uint32_t mLength, mCaseLength;
71 : };
72 : };
73 :
74 : /*
75 : * Compare results as numbers (data-type="number")
76 : */
77 0 : class txResultNumberComparator : public txXPathResultComparator
78 : {
79 : public:
80 : explicit txResultNumberComparator(bool aAscending);
81 :
82 : int compareValues(txObject* aVal1, txObject* aVal2) override;
83 : nsresult createSortableValue(Expr *aExpr, txIEvalContext *aContext,
84 : txObject *&aResult) override;
85 :
86 : private:
87 : int mAscending;
88 :
89 0 : class NumberValue : public txObject
90 : {
91 : public:
92 : double mVal;
93 : };
94 : };
95 :
96 : #endif
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