godot/core/io/xml_parser.cpp
Rémi Verschelde a7f49ac9a1 Update copyright statements to 2020
Happy new year to the wonderful Godot community!

We're starting a new decade with a well-established, non-profit, free
and open source game engine, and tons of further improvements in the
pipeline from hundreds of contributors.

Godot will keep getting better, and we're looking forward to all the
games that the community will keep developing and releasing with it.
2020-01-01 11:16:22 +01:00

552 lines
13 KiB
C++

/*************************************************************************/
/* xml_parser.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "xml_parser.h"
#include "core/print_string.h"
//#define DEBUG_XML
VARIANT_ENUM_CAST(XMLParser::NodeType);
static bool _equalsn(const CharType *str1, const CharType *str2, int len) {
int i;
for (i = 0; i < len && str1[i] && str2[i]; ++i)
if (str1[i] != str2[i])
return false;
// if one (or both) of the strings was smaller then they
// are only equal if they have the same length
return (i == len) || (str1[i] == 0 && str2[i] == 0);
}
String XMLParser::_replace_special_characters(const String &origstr) {
int pos = origstr.find("&");
int oldPos = 0;
if (pos == -1)
return origstr;
String newstr;
while (pos != -1 && pos < origstr.length() - 2) {
// check if it is one of the special characters
int specialChar = -1;
for (int i = 0; i < (int)special_characters.size(); ++i) {
const CharType *p = &origstr[pos] + 1;
if (_equalsn(&special_characters[i][1], p, special_characters[i].length() - 1)) {
specialChar = i;
break;
}
}
if (specialChar != -1) {
newstr += (origstr.substr(oldPos, pos - oldPos));
newstr += (special_characters[specialChar][0]);
pos += special_characters[specialChar].length();
} else {
newstr += (origstr.substr(oldPos, pos - oldPos + 1));
pos += 1;
}
// find next &
oldPos = pos;
pos = origstr.find("&", pos);
}
if (oldPos < origstr.length() - 1)
newstr += (origstr.substr(oldPos, origstr.length() - oldPos));
return newstr;
}
static inline bool _is_white_space(char c) {
return (c == ' ' || c == '\t' || c == '\n' || c == '\r');
}
//! sets the state that text was found. Returns true if set should be set
bool XMLParser::_set_text(char *start, char *end) {
// check if text is more than 2 characters, and if not, check if there is
// only white space, so that this text won't be reported
if (end - start < 3) {
char *p = start;
for (; p != end; ++p)
if (!_is_white_space(*p))
break;
if (p == end)
return false;
}
// set current text to the parsed text, and replace xml special characters
String s = String::utf8(start, (int)(end - start));
node_name = _replace_special_characters(s);
// current XML node type is text
node_type = NODE_TEXT;
return true;
}
void XMLParser::_parse_closing_xml_element() {
node_type = NODE_ELEMENT_END;
node_empty = false;
attributes.clear();
++P;
const char *pBeginClose = P;
while (*P != '>')
++P;
node_name = String::utf8(pBeginClose, (int)(P - pBeginClose));
#ifdef DEBUG_XML
print_line("XML CLOSE: " + node_name);
#endif
++P;
}
void XMLParser::_ignore_definition() {
node_type = NODE_UNKNOWN;
char *F = P;
// move until end marked with '>' reached
while (*P != '>')
++P;
node_name.parse_utf8(F, P - F);
++P;
}
bool XMLParser::_parse_cdata() {
if (*(P + 1) != '[')
return false;
node_type = NODE_CDATA;
// skip '<![CDATA['
int count = 0;
while (*P && count < 8) {
++P;
++count;
}
if (!*P)
return true;
char *cDataBegin = P;
char *cDataEnd = 0;
// find end of CDATA
while (*P && !cDataEnd) {
if (*P == '>' &&
(*(P - 1) == ']') &&
(*(P - 2) == ']')) {
cDataEnd = P - 2;
}
++P;
}
if (cDataEnd)
node_name = String::utf8(cDataBegin, (int)(cDataEnd - cDataBegin));
else
node_name = "";
#ifdef DEBUG_XML
print_line("XML CDATA: " + node_name);
#endif
return true;
}
void XMLParser::_parse_comment() {
node_type = NODE_COMMENT;
P += 1;
char *pCommentBegin = P;
int count = 1;
// move until end of comment reached
while (count) {
if (*P == '>')
--count;
else if (*P == '<')
++count;
++P;
}
P -= 3;
node_name = String::utf8(pCommentBegin + 2, (int)(P - pCommentBegin - 2));
P += 3;
#ifdef DEBUG_XML
print_line("XML COMMENT: " + node_name);
#endif
}
void XMLParser::_parse_opening_xml_element() {
node_type = NODE_ELEMENT;
node_empty = false;
attributes.clear();
// find name
const char *startName = P;
// find end of element
while (*P != '>' && !_is_white_space(*P))
++P;
const char *endName = P;
// find attributes
while (*P != '>') {
if (_is_white_space(*P))
++P;
else {
if (*P != '/') {
// we've got an attribute
// read the attribute names
const char *attributeNameBegin = P;
while (!_is_white_space(*P) && *P != '=')
++P;
const char *attributeNameEnd = P;
++P;
// read the attribute value
// check for quotes and single quotes, thx to murphy
while ((*P != '\"') && (*P != '\'') && *P)
++P;
if (!*P) // malformatted xml file
return;
const char attributeQuoteChar = *P;
++P;
const char *attributeValueBegin = P;
while (*P != attributeQuoteChar && *P)
++P;
if (!*P) // malformatted xml file
return;
const char *attributeValueEnd = P;
++P;
Attribute attr;
attr.name = String::utf8(attributeNameBegin,
(int)(attributeNameEnd - attributeNameBegin));
String s = String::utf8(attributeValueBegin,
(int)(attributeValueEnd - attributeValueBegin));
attr.value = _replace_special_characters(s);
attributes.push_back(attr);
} else {
// tag is closed directly
++P;
node_empty = true;
break;
}
}
}
// check if this tag is closing directly
if (endName > startName && *(endName - 1) == '/') {
// directly closing tag
node_empty = true;
endName--;
}
node_name = String::utf8(startName, (int)(endName - startName));
#ifdef DEBUG_XML
print_line("XML OPEN: " + node_name);
#endif
++P;
}
void XMLParser::_parse_current_node() {
char *start = P;
node_offset = P - data;
// more forward until '<' found
while (*P != '<' && *P)
++P;
if (!*P)
return;
if (P - start > 0) {
// we found some text, store it
if (_set_text(start, P))
return;
}
++P;
// based on current token, parse and report next element
switch (*P) {
case '/':
_parse_closing_xml_element();
break;
case '?':
_ignore_definition();
break;
case '!':
if (!_parse_cdata())
_parse_comment();
break;
default:
_parse_opening_xml_element();
break;
}
}
uint64_t XMLParser::get_node_offset() const {
return node_offset;
};
Error XMLParser::seek(uint64_t p_pos) {
ERR_FAIL_COND_V(!data, ERR_FILE_EOF);
ERR_FAIL_COND_V(p_pos >= length, ERR_FILE_EOF);
P = data + p_pos;
return read();
};
void XMLParser::_bind_methods() {
ClassDB::bind_method(D_METHOD("read"), &XMLParser::read);
ClassDB::bind_method(D_METHOD("get_node_type"), &XMLParser::get_node_type);
ClassDB::bind_method(D_METHOD("get_node_name"), &XMLParser::get_node_name);
ClassDB::bind_method(D_METHOD("get_node_data"), &XMLParser::get_node_data);
ClassDB::bind_method(D_METHOD("get_node_offset"), &XMLParser::get_node_offset);
ClassDB::bind_method(D_METHOD("get_attribute_count"), &XMLParser::get_attribute_count);
ClassDB::bind_method(D_METHOD("get_attribute_name", "idx"), &XMLParser::get_attribute_name);
ClassDB::bind_method(D_METHOD("get_attribute_value", "idx"), (String(XMLParser::*)(int) const) & XMLParser::get_attribute_value);
ClassDB::bind_method(D_METHOD("has_attribute", "name"), &XMLParser::has_attribute);
ClassDB::bind_method(D_METHOD("get_named_attribute_value", "name"), (String(XMLParser::*)(const String &) const) & XMLParser::get_attribute_value);
ClassDB::bind_method(D_METHOD("get_named_attribute_value_safe", "name"), &XMLParser::get_attribute_value_safe);
ClassDB::bind_method(D_METHOD("is_empty"), &XMLParser::is_empty);
ClassDB::bind_method(D_METHOD("get_current_line"), &XMLParser::get_current_line);
ClassDB::bind_method(D_METHOD("skip_section"), &XMLParser::skip_section);
ClassDB::bind_method(D_METHOD("seek", "position"), &XMLParser::seek);
ClassDB::bind_method(D_METHOD("open", "file"), &XMLParser::open);
ClassDB::bind_method(D_METHOD("open_buffer", "buffer"), &XMLParser::open_buffer);
BIND_ENUM_CONSTANT(NODE_NONE);
BIND_ENUM_CONSTANT(NODE_ELEMENT);
BIND_ENUM_CONSTANT(NODE_ELEMENT_END);
BIND_ENUM_CONSTANT(NODE_TEXT);
BIND_ENUM_CONSTANT(NODE_COMMENT);
BIND_ENUM_CONSTANT(NODE_CDATA);
BIND_ENUM_CONSTANT(NODE_UNKNOWN);
};
Error XMLParser::read() {
// if not end reached, parse the node
if (P && (P - data) < (int64_t)length - 1 && *P != 0) {
_parse_current_node();
return OK;
}
return ERR_FILE_EOF;
}
XMLParser::NodeType XMLParser::get_node_type() {
return node_type;
}
String XMLParser::get_node_data() const {
ERR_FAIL_COND_V(node_type != NODE_TEXT, "");
return node_name;
}
String XMLParser::get_node_name() const {
ERR_FAIL_COND_V(node_type == NODE_TEXT, "");
return node_name;
}
int XMLParser::get_attribute_count() const {
return attributes.size();
}
String XMLParser::get_attribute_name(int p_idx) const {
ERR_FAIL_INDEX_V(p_idx, attributes.size(), "");
return attributes[p_idx].name;
}
String XMLParser::get_attribute_value(int p_idx) const {
ERR_FAIL_INDEX_V(p_idx, attributes.size(), "");
return attributes[p_idx].value;
}
bool XMLParser::has_attribute(const String &p_name) const {
for (int i = 0; i < attributes.size(); i++) {
if (attributes[i].name == p_name)
return true;
}
return false;
}
String XMLParser::get_attribute_value(const String &p_name) const {
int idx = -1;
for (int i = 0; i < attributes.size(); i++) {
if (attributes[i].name == p_name) {
idx = i;
break;
}
}
ERR_FAIL_COND_V_MSG(idx < 0, "", "Attribute not found: " + p_name + ".");
return attributes[idx].value;
}
String XMLParser::get_attribute_value_safe(const String &p_name) const {
int idx = -1;
for (int i = 0; i < attributes.size(); i++) {
if (attributes[i].name == p_name) {
idx = i;
break;
}
}
if (idx < 0)
return "";
return attributes[idx].value;
}
bool XMLParser::is_empty() const {
return node_empty;
}
Error XMLParser::open_buffer(const Vector<uint8_t> &p_buffer) {
ERR_FAIL_COND_V(p_buffer.size() == 0, ERR_INVALID_DATA);
length = p_buffer.size();
data = memnew_arr(char, length + 1);
copymem(data, p_buffer.ptr(), length);
data[length] = 0;
P = data;
return OK;
}
Error XMLParser::open(const String &p_path) {
Error err;
FileAccess *file = FileAccess::open(p_path, FileAccess::READ, &err);
ERR_FAIL_COND_V_MSG(err != OK, err, "Cannot open file '" + p_path + "'.");
length = file->get_len();
ERR_FAIL_COND_V(length < 1, ERR_FILE_CORRUPT);
data = memnew_arr(char, length + 1);
file->get_buffer((uint8_t *)data, length);
data[length] = 0;
P = data;
memdelete(file);
return OK;
}
void XMLParser::skip_section() {
// skip if this element is empty anyway.
if (is_empty())
return;
// read until we've reached the last element in this section
int tagcount = 1;
while (tagcount && read() == OK) {
if (get_node_type() == XMLParser::NODE_ELEMENT &&
!is_empty()) {
++tagcount;
} else if (get_node_type() == XMLParser::NODE_ELEMENT_END)
--tagcount;
}
}
void XMLParser::close() {
if (data)
memdelete_arr(data);
data = NULL;
length = 0;
P = NULL;
node_empty = false;
node_type = NODE_NONE;
node_offset = 0;
}
int XMLParser::get_current_line() const {
return 0;
}
XMLParser::XMLParser() {
data = NULL;
close();
special_characters.push_back("&amp;");
special_characters.push_back("<lt;");
special_characters.push_back(">gt;");
special_characters.push_back("\"quot;");
special_characters.push_back("'apos;");
}
XMLParser::~XMLParser() {
if (data)
memdelete_arr(data);
}