git.sesse.net Git - xml-template/blob - c++0x/xml-template.cpp

   1 #include "xml-template.h"
   2
   3 #include <string.h>
   4 #include <libxml/parser.h>
   5
   6 using namespace std;
   7
   8 namespace {
   9
  10 void clean_node(xmlNode *node)
  11 {
  12         if (node->type != XML_ELEMENT_NODE) {
  13                 return;
  14         }
  15         if (strcmp(reinterpret_cast<const char *>(node->ns->href), "http://template.sesse.net/") == 0) {
  16                 xmlNode *frag = xmlNewDocFragment(node->doc);
  17                 xmlReplaceNode(node, frag);
  18                 frag->children = node->children;
  19         }
  20 }
  21
  22 }  // namespace
  23
  24 Directive::~Directive() {}
  25
  26 Replace::Replace(const string &str)
  27         : str(str) {}
  28
  29 void Replace::process(xmlNode *node, bool clean) {
  30         node->children = xmlNewTextLen(reinterpret_cast<const xmlChar *>(str.data()), str.size());
  31         if (clean) {
  32                 clean_node(node);
  33         }
  34 }
  35
  36 Clone::Clone(const vector<Directive *> &subdirectives)
  37         : subdirectives(subdirectives) {}
  38
  39 Clone::Clone(initializer_list<Directive *> subdirectives)
  40         : subdirectives(subdirectives) {}
  41
  42 Clone::~Clone()
  43 {
  44         for (auto it : subdirectives) {
  45                 delete it;
  46         }
  47 }
  48
  49 void Clone::process(xmlNode *node, bool clean)
  50 {
  51         // We can't use xmlNewDocFragment, since xmlDOMWrapCloneNode only knows
  52         // how to clone elements.
  53         vector<xmlNode *> new_nodes;
  54
  55         for (auto it : subdirectives) {
  56                 xmlNode *new_node;
  57                 xmlDOMWrapCloneNode(NULL, node->doc, node, &new_node, node->doc, NULL, 1, 0);
  58                 it->process(new_node, clean);
  59                 for (xmlNode *child = new_node->children; child != NULL; child = child->next) {
  60                         new_nodes.push_back(child);
  61                 }
  62         }
  63
  64         node->children = NULL;
  65         for (auto child : new_nodes) {
  66                 xmlAddChild(node, child);
  67         }
  68         if (clean) {
  69                 clean_node(node);
  70         }
  71 }
  72
  73 Substitute::Substitute(const unordered_map<string, Directive*> &substitution_map)
  74         : substitution_map(substitution_map) {}
  75
  76 Substitute::Substitute(initializer_list<pair<const string, Directive*>> substitution_map)
  77         : substitution_map(substitution_map) {}
  78
  79 Substitute::~Substitute()
  80 {
  81         for (auto it : substitution_map) {
  82                 delete it.second;
  83         }
  84 }
  85
  86 void Substitute::process(xmlNode *node, bool clean)
  87 {
  88         for (xmlNode *child = node->children; child != NULL; child = child->next) {
  89                 bool processed = false;
  90
  91                 if (child->type == XML_ELEMENT_NODE) {
  92                         // Find the ID, if any.
  93                         string id;
  94                         for (xmlAttr *attr = child->properties; attr != NULL; attr = attr->next) {
  95                                 if (strcmp(reinterpret_cast<const char *>(attr->ns->href), "http://template.sesse.net/") == 0 &&
  96                                     strcmp(reinterpret_cast<const char *>(attr->name), "id") == 0) {
  97                                         id = reinterpret_cast<const char *>(xmlNodeGetContent(attr->children));
  98
  99                                         if (clean) {
 100                                                 if (attr->prev == NULL) {
 101                                                         child->properties = attr->next;
 102                                                 } else {
 103                                                         attr->prev->next = attr->next;
 104                                                 }
 105                                         }
 106                                 }
 107                         }
 108
 109                         // Check all substitutions to see if we found anything appropriate.
 110                         for (auto it : substitution_map) {
 111                                 if (it.first == reinterpret_cast<const char *>(child->name) ||
 112                                     (!id.empty() && it.first == ("#" + id))) {
 113                                         it.second->process(child, clean);
 114                                         processed = true;
 115                                         break;
 116                                 }
 117                         }
 118                 }
 119
 120                 if (!processed) {
 121                         process(child, clean);
 122                 }
 123         }
 124         if (clean) {
 125                 clean_node(node);
 126         }
 127 }
 128
 129 void process_file(const string &input_filename,
 130                   const string &output_filename,
 131                   Directive *root_directive)
 132 {
 133         LIBXML_TEST_VERSION
 134
 135         xmlDocPtr doc = xmlParseFile(input_filename.c_str());
 136         root_directive->process(xmlDocGetRootElement(doc), true);
 137         xmlSaveFile(output_filename.c_str(), doc);
 138         xmlFreeDoc(doc);
 139
 140         xmlCleanupParser();
 141         xmlMemoryDump();
 142 }