src/libutil/xml-writer.cc


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

#include <assert.h>

#include "xml-writer.hh"


namespace nix {
    

XMLWriter::XMLWriter(bool indent, std::ostream & output)
    : output(output), indent(indent)
{
    output << "<?xml version='1.0' encoding='utf-8'?>\n";
    closed = false;
}


XMLWriter::~XMLWriter()
{
    close();
}


void XMLWriter::close()
{
    if (closed) return;
    while (!pendingElems.empty()) closeElement();
    closed = true;
}


void XMLWriter::indent_(unsigned int depth)
{
    if (!indent) return;
    output << string(depth * 2, ' ');
}


void XMLWriter::openElement(const string & name,
    const XMLAttrs & attrs)
{
    assert(!closed);
    indent_(pendingElems.size());
    output << "<" << name;
    writeAttrs(attrs);
    output << ">";
    if (indent) output << "\n";
    pendingElems.push_back(name);
}


void XMLWriter::closeElement()
{
    assert(!pendingElems.empty());
    indent_(pendingElems.size() - 1);
    output << "</" << pendingElems.back() << ">";
    if (indent) output << "\n";
    pendingElems.pop_back();
    if (pendingElems.empty()) closed = true;
}


void XMLWriter::writeEmptyElement(const string & name,
    const XMLAttrs & attrs)
{
    assert(!closed);
    indent_(pendingElems.size());
    output << "<" << name;
    writeAttrs(attrs);
    output << " />";
    if (indent) output << "\n";
}


void XMLWriter::writeCharData(const string & data)
{
    assert(!pendingElems.empty());
    for (unsigned int i = 0; i < data.size(); ++i) {
        char c = data[i];
        if (c == '<') output << "&lt;";
        else if (c == '&') output << "&amp;";
        else output << c;
    }
}


void XMLWriter::writeAttrs(const XMLAttrs & attrs)
{
    for (XMLAttrs::const_iterator i = attrs.begin(); i != attrs.end(); ++i) {
        output << " " << i->first << "=\"";
        for (unsigned int j = 0; j < i->second.size(); ++j) {
            char c = i->second[j];
            if (c == '"') output << "&quot;";
            else if (c == '<') output << "&lt;";
            else if (c == '>') output << "&gt;";
            else if (c == '&') output << "&amp;";
            /* Escape newlines to prevent attribute normalisation (see
               XML spec, section 3.3.3. */
            else if (c == '\n') output << "&#xA;";
            else output << c;
        }
        output << "\"";
    }
}


#if 0
int main(int argc, char * * argv)
{
    XMLWriter doc(cout);
    
    //    OpenElement e(doc, "foo");

    doc.openElement("foo");

    doc.writeCharData("dit is een test &\n");
    doc.writeCharData("<foo>\n");

    for (int i = 0; i < 5; ++i) {
        XMLAttrs attrs;
        attrs["a"] = "b";
        attrs["bla"] = "<foo>'&\">";
        XMLOpenElement e(doc, "item", attrs);
        doc.writeCharData("x");
    }

    return 0;
}
#endif

 
}