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annotate dep/pugixml/docs/samples/save_custom_writer.cpp @ 327:b5d6c27c308f

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anime: refactor Anime::SeriesSeason to Season class ToLocalString has also been altered to take in both season and year because lots of locales actually treat formatting seasons differently! most notably is Russian which adds a suffix at the end to notate seasons(??)
author Paper <paper@paper.us.eu.org>
date Thu, 13 Jun 2024 01:49:18 -0400
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55
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1 #include "pugixml.hpp"
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2
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3 #include <string>
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4 #include <iostream>
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5 #include <cstring>
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6
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7 // tag::code[]
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8 struct xml_string_writer: pugi::xml_writer
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9 {
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10 std::string result;
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11
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12 virtual void write(const void* data, size_t size)
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13 {
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14 result.append(static_cast<const char*>(data), size);
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15 }
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16 };
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17 // end::code[]
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18
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19 struct xml_memory_writer: pugi::xml_writer
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20 {
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21 char* buffer;
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22 size_t capacity;
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23
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24 size_t result;
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25
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26 xml_memory_writer(): buffer(0), capacity(0), result(0)
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27 {
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28 }
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29
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30 xml_memory_writer(char* buffer, size_t capacity): buffer(buffer), capacity(capacity), result(0)
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31 {
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32 }
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33
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34 size_t written_size() const
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35 {
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36 return result < capacity ? result : capacity;
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37 }
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38
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39 virtual void write(const void* data, size_t size)
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40 {
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41 if (result < capacity)
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42 {
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43 size_t chunk = (capacity - result < size) ? capacity - result : size;
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44
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45 memcpy(buffer + result, data, chunk);
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46 }
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47
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48 result += size;
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49 }
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50 };
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51
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52 std::string node_to_string(pugi::xml_node node)
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53 {
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54 xml_string_writer writer;
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55 node.print(writer);
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56
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57 return writer.result;
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58 }
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59
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60 char* node_to_buffer(pugi::xml_node node, char* buffer, size_t size)
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61 {
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62 if (size == 0) return buffer;
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63
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64 // leave one character for null terminator
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65 xml_memory_writer writer(buffer, size - 1);
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66 node.print(writer);
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67
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68 // null terminate
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69 buffer[writer.written_size()] = 0;
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70
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71 return buffer;
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72 }
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73
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74 char* node_to_buffer_heap(pugi::xml_node node)
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75 {
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76 // first pass: get required memory size
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77 xml_memory_writer counter;
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78 node.print(counter);
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79
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80 // allocate necessary size (+1 for null termination)
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81 char* buffer = new char[counter.result + 1];
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82
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83 // second pass: actual printing
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84 xml_memory_writer writer(buffer, counter.result);
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85 node.print(writer);
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86
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87 // null terminate
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88 buffer[writer.written_size()] = 0;
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89
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90 return buffer;
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91 }
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92
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93 int main()
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94 {
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95 // get a test document
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96 pugi::xml_document doc;
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97 doc.load_string("<foo bar='baz'>hey</foo>");
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98
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99 // get contents as std::string (single pass)
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100 std::cout << "contents: [" << node_to_string(doc) << "]\n";
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101
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102 // get contents into fixed-size buffer (single pass)
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103 char large_buf[128];
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104 std::cout << "contents: [" << node_to_buffer(doc, large_buf, sizeof(large_buf)) << "]\n";
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105
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106 // get contents into fixed-size buffer (single pass, shows truncating behavior)
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107 char small_buf[22];
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108 std::cout << "contents: [" << node_to_buffer(doc, small_buf, sizeof(small_buf)) << "]\n";
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109
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110 // get contents into heap-allocated buffer (two passes)
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111 char* heap_buf = node_to_buffer_heap(doc);
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112 std::cout << "contents: [" << heap_buf << "]\n";
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113 delete[] heap_buf;
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114 }
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115
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116 // vim:et