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#include "cru/xml/XmlParser.hpp"
#include "cru/xml/XmlNode.hpp"
namespace cru::xml {
XmlElementNode* XmlParser::Parse() {
if (!cache_) {
cache_ = DoParse();
}
return static_cast<XmlElementNode*>(cache_->Clone());
}
char16_t XmlParser::Read1() {
if (current_position_ >= xml_.size()) {
throw XmlParsingException(u"Unexpected end of xml");
}
return xml_[current_position_++];
}
void XmlParser::ReadSpacesAndDiscard() {
while (current_position_ < xml_.size() &&
(xml_[current_position_] == ' ' || xml_[current_position_] == '\t' ||
xml_[current_position_] == '\n' || xml_[current_position_] == '\r')) {
++current_position_;
}
}
String XmlParser::ReadSpaces() {
String spaces;
while (current_position_ < xml_.size() &&
(xml_[current_position_] == ' ' || xml_[current_position_] == '\t' ||
xml_[current_position_] == '\n' || xml_[current_position_] == '\r')) {
spaces += xml_[current_position_];
++current_position_;
}
return spaces;
}
String XmlParser::ReadIdenitifier() {
String identifier;
while (current_position_ < xml_.size() &&
(xml_[current_position_] >= 'a' && xml_[current_position_] <= 'z' ||
xml_[current_position_] >= 'A' && xml_[current_position_] <= 'Z' ||
xml_[current_position_] >= '0' && xml_[current_position_] <= '9' ||
xml_[current_position_] == '_')) {
identifier += xml_[current_position_];
++current_position_;
}
return identifier;
}
String XmlParser::ReadAttributeString() {
if (Read1() != '"') {
throw XmlParsingException(u"Expected \".");
}
String string;
while (true) {
char16_t c = Read1();
if (c == '"') {
break;
}
string += c;
}
return string;
}
XmlElementNode* XmlParser::DoParse() {
while (current_position_ < xml_.size()) {
switch (xml_[current_position_]) {
case '<': {
++current_position_;
if (Read1() == '/') {
} else {
ReadSpacesAndDiscard();
String tag = ReadIdenitifier();
XmlElementNode* node = new XmlElementNode(tag);
while (true) {
ReadSpacesAndDiscard();
if (Read1() == '>') {
break;
} else {
String attribute_name = ReadIdenitifier();
ReadSpacesAndDiscard();
if (Read1() != '=') {
throw XmlParsingException(u"Expected '='");
}
ReadSpacesAndDiscard();
String attribute_value = ReadAttributeString();
node->AddAttribute(attribute_name, attribute_value);
}
}
current_->AddChild(node);
current_ = node;
}
break;
}
}
}
return pseudo_root_node_;
}
} // namespace cru::xml
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