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annotate dep/pugixml/docs/samples/load_stream.cpp @ 137:69db40272acd

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dep/animia: [WIP] huge refactor this WILL NOT compile, because lots of code has been changed and every API in the original codebase has been removed. note that this api setup is not exactly permanent...
author Paper <mrpapersonic@gmail.com>
date Fri, 10 Nov 2023 13:52:47 -0500
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