summaryrefslogtreecommitdiffstats
path: root/unotools/source/config/configpaths.cxx
blob: 4c626d96b4e09666b4ce77589adf163ba55f3ccb (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
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#include <sal/config.h>

#include <cassert>
#include <string_view>

#include <unotools/configpaths.hxx>
#include <rtl/ustring.hxx>
#include <rtl/ustrbuf.hxx>
#include <osl/diagnose.h>
#include <o3tl/string_view.hxx>

namespace utl
{

static
void lcl_resolveCharEntities(OUString & aLocalString)
{
    sal_Int32 nEscapePos=aLocalString.indexOf('&');
    if (nEscapePos < 0) return;

    OUStringBuffer aResult;
    sal_Int32 nStart = 0;

    do
    {
        sal_Unicode ch = 0;
        if (aLocalString.match("&amp;",nEscapePos))
            ch = '&';

        else if (aLocalString.match("&apos;",nEscapePos))
            ch = '\'';

        else if (aLocalString.match("&quot;",nEscapePos))
            ch = '"';

        OSL_ENSURE(ch,"Configuration path contains '&' that is not part of a valid character escape");
        if (ch)
        {
            aResult.append(aLocalString.subView(nStart,nEscapePos-nStart) + OUStringChar(ch));

            sal_Int32 nEscapeEnd=aLocalString.indexOf(';',nEscapePos);
            nStart = nEscapeEnd+1;
            nEscapePos=aLocalString.indexOf('&',nStart);
        }
        else
        {
            nEscapePos=aLocalString.indexOf('&',nEscapePos+1);
        }
    }
    while ( nEscapePos > 0);

    aResult.append(aLocalString.subView(nStart));

    aLocalString = aResult.makeStringAndClear();
}

bool splitLastFromConfigurationPath(std::u16string_view _sInPath,
                                        OUString& _rsOutPath,
                                        OUString& _rsLocalName)
{
    size_t nStart,nEnd;

    size_t nPos = _sInPath.size();

    // for backwards compatibility, strip trailing slash
    if (nPos > 1 && _sInPath[ nPos - 1 ] == '/')
    {
        --nPos;
    }

    // check for set element ['xxx'] or ["yyy"]
    bool decode;
    if (nPos > 0 && _sInPath[ nPos - 1 ] == ']')
    {
        decode = true;
        if (nPos < 3) { // expect at least chQuote + chQuote + ']' at _sInPath[nPos-3..nPos-1]
            goto invalid;
        }
        nPos -= 2;
        sal_Unicode chQuote = _sInPath[nPos];

        if (chQuote == '\'' || chQuote == '\"')
        {
            nEnd = nPos;
            nPos = _sInPath.rfind(chQuote,nEnd - 1);
            if (nPos == std::u16string_view::npos) {
                goto invalid;
            }
            nStart = nPos + 1;
        }
        else
        {
            goto invalid;
        }

        OSL_ENSURE(nPos > 0 && _sInPath[nPos - 1] == '[', "Invalid config path: unmatched quotes or brackets");
        if (nPos > 1 && _sInPath[nPos - 1] == '[')
            // expect at least '/' + '[' at _sInPath[nPos-2..nPos-1]
        {
            nPos =  _sInPath.rfind('/',nPos - 2);
            if (nPos == std::u16string_view::npos) {
                goto invalid;
            }
        }
        else
        {
            goto invalid;
        }

    }
    else
    {
        decode = false;
        nEnd = nPos;
        if (nEnd == 0) {
            goto invalid;
        }
        nPos = _sInPath.rfind('/',nEnd - 1);
        if (nPos == std::u16string_view::npos) {
            goto invalid;
        }
        nStart = nPos + 1;
    }
    assert( nPos != std::u16string_view::npos &&
            nPos < nStart &&
            nStart <= nEnd &&
            nEnd <= _sInPath.size() );

    assert(_sInPath[nPos] == '/');
    OSL_ENSURE(nPos != 0 , "Invalid config child path: immediate child of root");

    _rsLocalName = _sInPath.substr(nStart, nEnd-nStart);
    _rsOutPath = (nPos > 0) ? OUString(_sInPath.substr(0,nPos)) : OUString();
    if (decode) {
        lcl_resolveCharEntities(_rsLocalName);
    }

    return true;

invalid:
    _rsOutPath.clear();
    _rsLocalName = _sInPath;
    return false;
}

OUString extractFirstFromConfigurationPath(OUString const& _sInPath, OUString* _sOutPath)
{
    sal_Int32 nSep      = _sInPath.indexOf('/');
    sal_Int32 nBracket  = _sInPath.indexOf('[');

    sal_Int32 nStart    = nBracket + 1;
    sal_Int32 nEnd      = nSep;

    if (0 <= nBracket) // found a bracket-quoted relative path
    {
        if (nSep < 0 || nBracket < nSep) // and the separator comes after it
        {
            sal_Unicode chQuote = _sInPath[nStart];
            if (chQuote == '\'' || chQuote == '\"')
            {
                ++nStart;
                nEnd      = _sInPath.indexOf(chQuote, nStart+1);
                nBracket  = nEnd+1;
            }
            else
            {
                nEnd = _sInPath.indexOf(']',nStart);
                nBracket = nEnd;
            }
            OSL_ENSURE(nEnd > nStart && _sInPath[nBracket] == ']', "Invalid config path: improper mismatch of quote or bracket");
            OSL_ENSURE((nBracket+1 == _sInPath.getLength() && nSep == -1) || (_sInPath[nBracket+1] == '/' && nSep == nBracket+1), "Invalid config path: brackets not followed by slash");
        }
        else // ... but our initial element name is in simple form
            nStart = 0;
    }

    OUString sResult = (nEnd >= 0) ? _sInPath.copy(nStart, nEnd-nStart) : _sInPath;
    lcl_resolveCharEntities(sResult);

    if (_sOutPath != nullptr)
    {
        *_sOutPath = (nSep >= 0) ? _sInPath.copy(nSep + 1) : OUString();
    }

    return sResult;
}

// find the position after the prefix in the nested path
static sal_Int32 lcl_findPrefixEnd(std::u16string_view _sNestedPath, std::u16string_view _sPrefixPath)
{
    // TODO: currently handles only exact prefix matches
    size_t nPrefixLength = _sPrefixPath.size();

    OSL_ENSURE(nPrefixLength == 0 || _sPrefixPath[nPrefixLength-1] != '/',
                "Cannot handle slash-terminated prefix paths");

    bool bIsPrefix;
    if (_sNestedPath.size() > nPrefixLength)
    {
        bIsPrefix = _sNestedPath[nPrefixLength] == '/' &&
                    o3tl::starts_with(_sNestedPath, _sPrefixPath);
        ++nPrefixLength;
    }
    else if (_sNestedPath.size() == nPrefixLength)
    {
        bIsPrefix = _sNestedPath == _sPrefixPath;
    }
    else
    {
        bIsPrefix = false;
    }

    return bIsPrefix ? nPrefixLength : 0;
}

bool isPrefixOfConfigurationPath(std::u16string_view _sNestedPath,
                                     std::u16string_view _sPrefixPath)
{
    return _sPrefixPath.empty() || lcl_findPrefixEnd(_sNestedPath,_sPrefixPath) != 0;
}

OUString dropPrefixFromConfigurationPath(OUString const& _sNestedPath,
                                         std::u16string_view _sPrefixPath)
{
    if ( sal_Int32 nPrefixEnd = lcl_findPrefixEnd(_sNestedPath,_sPrefixPath) )
    {
        return _sNestedPath.copy(nPrefixEnd);
    }
    else
    {
        OSL_ENSURE(_sPrefixPath.empty(),  "Path does not start with expected prefix");

        return _sNestedPath;
    }
}

static
OUString lcl_wrapName(std::u16string_view _sContent, const OUString& _sType)
{
    const sal_Unicode * const pBeginContent = _sContent.data();
    const sal_Unicode * const pEndContent   = pBeginContent + _sContent.size();

    OSL_PRECOND(!_sType.isEmpty(), "Unexpected config type name: empty");
    OSL_PRECOND(pBeginContent <= pEndContent, "Invalid config name: empty");

    if (pBeginContent == pEndContent)
        return _sType;

    OUStringBuffer aNormalized(_sType.getLength() + _sContent.size() + 4); // reserve approximate size initially

    // prefix: type, opening bracket and quote
    aNormalized.append( _sType + "['" );

    // content: copy over each char and handle escaping
    for(const sal_Unicode* pCur = pBeginContent; pCur != pEndContent; ++pCur)
    {
        // append (escape if needed)
        switch(*pCur)
        {
        case u'&' : aNormalized.append( "&amp;" ); break;
        case u'\'': aNormalized.append( "&apos;" ); break;
        case u'\"': aNormalized.append( "&quot;" ); break;

        default: aNormalized.append( *pCur );
        }
    }

    // suffix: closing quote and bracket
    aNormalized.append( "']" );

    return aNormalized.makeStringAndClear();
}

OUString wrapConfigurationElementName(std::u16string_view _sElementName)
{
    return lcl_wrapName(_sElementName, "*" );
}

OUString wrapConfigurationElementName(std::u16string_view _sElementName,
                                      OUString const& _sTypeName)
{
    // todo: check that _sTypeName is valid
    return lcl_wrapName(_sElementName, _sTypeName);
}

} // namespace utl

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */