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                 frag->last = node->last;
  20         }
  21 }
  22
  23 }  // namespace
  24
  25 Directive::~Directive() {}
  26
  27 Replace::Replace(const string &str)
  28         : str(str) {}
  29
  30 void Replace::process(xmlNode *node, bool clean) {
  31         xmlNodeSetContentLen(node, reinterpret_cast<const xmlChar *>(str.data()), str.size());
  32         if (clean) {
  33                 clean_node(node);
  34         }
  35 }
  36
  37 Clone::Clone(const vector<Directive *> &subdirectives)
  38         : subdirectives(subdirectives) {}
  39
  40 Clone::Clone(initializer_list<Directive *> subdirectives)
  41         : subdirectives(subdirectives) {}
  42
  43 Clone::~Clone()
  44 {
  45         for (auto it : subdirectives) {
  46                 delete it;
  47         }
  48 }
  49
  50 void Clone::process(xmlNode *node, bool clean)
  51 {
  52         // We can't use xmlNewDocFragment, since xmlDOMWrapCloneNode only knows
  53         // how to clone elements.
  54         vector<xmlNode *> new_nodes;
  55
  56         for (auto it : subdirectives) {
  57                 xmlNode *new_node;
  58                 xmlDOMWrapCloneNode(NULL, node->doc, node, &new_node, node->doc, NULL, 1, 0);
  59                 it->process(new_node, clean);
  60                 for (xmlNode *child = new_node->children; child != NULL; child = child->next) {
  61                         new_nodes.push_back(child);
  62                 }
  63         }
  64
  65         xmlFreeNodeList(node->children);
  66         node->content = NULL;
  67         node->children = node->last = NULL;
  68
  69         for (auto child : new_nodes) {
  70                 xmlAddChild(node, child);
  71         }
  72         if (clean) {
  73                 clean_node(node);
  74         }
  75 }
  76
  77 Substitute::Substitute(const unordered_map<string, Directive*> &substitution_map)
  78         : substitution_map(substitution_map) {}
  79
  80 Substitute::Substitute(initializer_list<pair<const string, Directive*>> substitution_map)
  81         : substitution_map(substitution_map) {}
  82
  83 Substitute::~Substitute()
  84 {
  85         for (auto it : substitution_map) {
  86                 delete it.second;
  87         }
  88 }
  89
  90 void Substitute::process(xmlNode *node, bool clean)
  91 {
  92         for (xmlNode *child = node->children; child != NULL; child = child->next) {
  93                 bool processed = false;
  94
  95                 if (child->type == XML_ELEMENT_NODE) {
  96                         // Find the ID, if any.
  97                         string id;
  98                         for (xmlAttr *attr = child->properties; attr != NULL; attr = attr->next) {
  99                                 if (strcmp(reinterpret_cast<const char *>(attr->ns->href), "http://template.sesse.net/") == 0 &&
 100                                     strcmp(reinterpret_cast<const char *>(attr->name), "id") == 0) {
 101                                         id = reinterpret_cast<const char *>(xmlNodeGetContent(attr->children));
 102
 103                                         if (clean) {
 104                                                 if (attr->prev == NULL) {
 105                                                         child->properties = attr->next;
 106                                                 } else {
 107                                                         attr->prev->next = attr->next;
 108                                                 }
 109                                         }
 110                                 }
 111                         }
 112
 113                         // Check all substitutions to see if we found anything appropriate.
 114                         for (auto it : substitution_map) {
 115                                 if (it.first == reinterpret_cast<const char *>(child->name) ||
 116                                     (!id.empty() && it.first == ("#" + id))) {
 117                                         it.second->process(child, clean);
 118                                         processed = true;
 119                                         break;
 120                                 }
 121                         }
 122                 }
 123
 124                 if (!processed) {
 125                         process(child, clean);
 126                 }
 127         }
 128         if (clean) {
 129                 clean_node(node);
 130         }
 131 }
 132
 133 void process_file(const string &input_filename,
 134                   const string &output_filename,
 135                   Directive *root_directive)
 136 {
 137         LIBXML_TEST_VERSION
 138
 139         xmlDocPtr doc = xmlParseFile(input_filename.c_str());
 140         root_directive->process(xmlDocGetRootElement(doc), true);
 141         xmlSaveFile(output_filename.c_str(), doc);
 142         xmlFreeDoc(doc);
 143
 144         xmlCleanupParser();
 145         xmlMemoryDump();
 146 }