XML
Creating and parsing XML files
This example demonstrates basic XML handling. Two facilities are demonstrated - lower level (XmlParser and XmlTag) and higher level - XmlNode.
sz = (10, 20)
text = Some text
lang: CS-CZ
score:
peter ..... 100
john ..... 10
frank ..... 20
---- XmlTag (encoding) -----------------
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<Configuration>
<Language id="CS-CZ"/>
<Dimension x="10" y="20"/>
<text>Some text</text>
<Scores>
<Player name="peter" score="100"/>
<Player name="john" score="10"/>
<Player name="frank" score="20"/>
</Scores>
</Configuration>
---- XmlParser -----------------
sz = (10, 20)
text = Some text
lang: CS-CZ
score:
peter ..... 100
john ..... 10
frank ..... 20
---- XmlNode -----------------
Dimension x: 10
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<!DOCTYPE Configuration>
<Configuration>
<Language id="CS-CZ"/>
<Dimension x="10" y="20"/>
<text>Some text</text>
<TEST test_attr="23"/>
</Configuration>
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XML.cpp
#include <Core/Core.h>
using namespace Upp;
struct Data {
Size sz;
int lang;
String text;
VectorMap<String, int> score;
double number;
void Dump();
String ToXML();
void LoadXML(XmlParser& p);
};
void Data::Dump()
{
DUMP(sz);
DUMP(text);
LOG("lang: " << LNGAsText(lang));
LOG("score: ");
for(int i = 0; i < score.GetCount(); i++)
LOG(" " << score.GetKey(i) << " ..... " << score[i]);
DUMP(number);
}
String Data::ToXML()
{
String scores;
for(int i = 0; i < score.GetCount(); i++)
scores << XmlTag("Player")("name", score.GetKey(i))("score", score[i])();
return
XmlHeader() +
XmlTag("Configuration") (
XmlTag("Language")("id", LNGAsText(lang))() +
XmlTag("Dimension")("x", sz.cx)("y", sz.cy)() +
XmlTag("text").Text(text) +
XmlTag("Scores") (scores) +
XmlTag("Number")("value", number)()
);
}
void Data::LoadXML(XmlParser& p)
{
while(!p.IsTag())
p.Skip();
p.PassTag("Configuration");
while(!p.End())
if(p.TagE("Language"))
lang = LNGFromText(p["id"]);
else
if(p.TagE("Dimension")) {
sz.cx = minmax(p.Int("x"), 1, 32);
sz.cy = minmax(p.Int("y"), 1, 32);
}
else
if(p.Tag("Scores"))
while(!p.End()) {
if(p.TagE("Player")) {
int& x = score.GetAdd(p["name"]);
x = p.Int("score");
}
else
p.Skip();
}
else
if(p.Tag("text")) {
text = p.ReadText();
p.PassEnd();
}
else
if(p.TagE("Number")) {
number = p.Double("value");
}
else
p.Skip();
}
CONSOLE_APP_MAIN
{
Data x;
x.sz.cx = 10;
x.sz.cy = 20;
x.lang = LNGFromText("CS-CZ");
x.text = "Some text";
x.score.Add("peter", 100);
x.score.Add("john", 10);
x.score.Add("frank", 20);
x.number = 1.2345e100;
x.Dump();
String xml = x.ToXML();
LOG("\n---- XmlTag (encoding) -----------------");
LOG(xml);
LOG("\n---- XmlParser -----------------");
Data y;
XmlParser p(xml);
y.LoadXML(p);
y.Dump();
LOG("\n---- XmlNode -----------------");
XmlNode xn = ParseXML(xml);
LOG("Dimension x: " << xn["Configuration"]["Dimension"].Attr("x"));
xn("Configuration").Remove("Scores");
XmlNode& n = xn("Configuration")("TEST");
n.SetAttr("test_attr", "23");
LOG(AsXML(xn));
LOG("Missing tag: " << xn["Configuration"]["MISSING_TAG"].Attr("doesnotmatter"));
}
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