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annotate dep/pugixml/docs/samples/load_stream.cpp @ 340:74e2365326c6

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dep/animone: add experimental accessibility strategy I also moved most of the functions out of util/win32.cc, because that file is meant for things that are shared between the different functions, and currently that is only wide string conversion helpers.
author Paper <paper@paper.us.eu.org>
date Wed, 19 Jun 2024 23:13:55 -0400
parents d10b6c6b432e
children
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55
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1 #include "pugixml.hpp"
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2
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3 #include <fstream>
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4 #include <iomanip>
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5 #include <iostream>
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6
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7 void print_doc(const char* message, const pugi::xml_document& doc, const pugi::xml_parse_result& result)
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8 {
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9 std::cout
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10 << message
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11 << "\t: load result '" << result.description() << "'"
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12 << ", first character of root name: U+" << std::hex << std::uppercase << std::setw(4) << std::setfill('0') << pugi::as_wide(doc.first_child().name())[0]
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13 << ", year: " << doc.first_child().first_child().first_child().child_value()
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14 << std::endl;
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15 }
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16
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17 bool try_imbue(std::wistream& stream, const char* name)
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18 {
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19 try
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20 {
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21 stream.imbue(std::locale(name));
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22
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23 return true;
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24 }
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25 catch (const std::exception&)
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26 {
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27 return false;
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28 }
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29 }
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30
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31 int main()
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32 {
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33 pugi::xml_document doc;
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34
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35 {
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36 // tag::code[]
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37 std::ifstream stream("weekly-utf-8.xml");
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38 pugi::xml_parse_result result = doc.load(stream);
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39 // end::code[]
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40
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41 // first character of root name: U+9031, year: 1997
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42 print_doc("UTF8 file from narrow stream", doc, result);
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43 }
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44
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45 {
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46 std::ifstream stream("weekly-utf-16.xml");
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47 pugi::xml_parse_result result = doc.load(stream);
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48
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49 // first character of root name: U+9031, year: 1997
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50 print_doc("UTF16 file from narrow stream", doc, result);
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51 }
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52
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53 {
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54 // Since wide streams are treated as UTF-16/32 ones, you can't load the UTF-8 file from a wide stream
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55 // directly if you have localized characters; you'll have to provide a UTF8 locale (there is no
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56 // standard one; you can use utf8_codecvt_facet from Boost or codecvt_utf8 from C++0x)
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57 std::wifstream stream("weekly-utf-8.xml");
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58
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59 if (try_imbue(stream, "en_US.UTF-8")) // try Linux encoding
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60 {
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61 pugi::xml_parse_result result = doc.load(stream);
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62
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63 // first character of root name: U+00E9, year: 1997
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64 print_doc("UTF8 file from wide stream", doc, result);
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65 }
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66 else
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67 {
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68 std::cout << "UTF-8 locale is not available\n";
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69 }
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70 }
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71
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72 {
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73 // Since wide streams are treated as UTF-16/32 ones, you can't load the UTF-16 file from a wide stream without
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74 // using custom codecvt; you can use codecvt_utf16 from C++0x
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75 }
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76
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77 {
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78 // Since encoding names are non-standard, you can't load the Shift-JIS (or any other non-ASCII) file
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79 // from a wide stream portably
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80 std::wifstream stream("weekly-shift_jis.xml");
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81
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82 if (try_imbue(stream, ".932") || // try Microsoft encoding
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83 try_imbue(stream, "ja_JP.SJIS")) // try Linux encoding; run "localedef -i ja_JP -c -f SHIFT_JIS /usr/lib/locale/ja_JP.SJIS" to get it
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84 {
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85 pugi::xml_parse_result result = doc.load(stream);
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86
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87 // first character of root name: U+9031, year: 1997
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88 print_doc("Shift-JIS file from wide stream", doc, result);
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89 }
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90 else
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91 {
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92 std::cout << "Shift-JIS locale is not available\n";
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93 }
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94 }
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95 }
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96
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97 // vim:et