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/*=============================================================================
Copyright (c) 2017 Daniel James
Use, modification and distribution is subject to the Boost Software
License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
#include "xml_parse.hpp"
#include "simple_parse.hpp"
#include "stream.hpp"
#include "utils.hpp"
namespace quickbook
{
namespace detail
{
// write_xml_tree
void write_xml_tree_impl(
std::string& out, xml_element* node, unsigned int depth);
void write_xml_tree(xml_element* node)
{
std::string result;
write_xml_tree_impl(result, node, 0);
quickbook::detail::out() << result << std::flush;
}
void write_xml_tree_impl(
std::string& out, xml_element* node, unsigned int depth)
{
if (!node) {
return;
}
for (unsigned i = 0; i < depth; ++i) {
out += " ";
}
switch (node->type_) {
case xml_element::element_node:
out += "Node: ";
out += node->name_;
break;
case xml_element::element_text:
out += "Text";
break;
case xml_element::element_html:
out += "HTML";
break;
default:
out += "Unknown node type";
break;
}
out += "\n";
for (xml_element* it = node->children(); it; it = it->next()) {
write_xml_tree_impl(out, it, depth + 1);
}
}
// xml_parse
void read_tag(
xml_tree_builder&,
string_iterator& it,
string_iterator start,
string_iterator end);
void read_close_tag(
xml_tree_builder&,
string_iterator& it,
string_iterator start,
string_iterator end);
void skip_question_mark_tag(
string_iterator& it, string_iterator start, string_iterator end);
void skip_exclamation_mark_tag(
string_iterator& it, string_iterator start, string_iterator end);
quickbook::string_view read_tag_name(
string_iterator& it, string_iterator start, string_iterator end);
quickbook::string_view read_attribute_value(
string_iterator& it, string_iterator start, string_iterator end);
quickbook::string_view read_string(
string_iterator& it, string_iterator end);
xml_tree xml_parse(quickbook::string_view source)
{
typedef string_iterator iterator;
iterator it = source.begin(), end = source.end();
xml_tree_builder builder;
while (true) {
iterator start = it;
read_to(it, end, '<');
if (start != it) {
builder.add_element(xml_element::text_node(
quickbook::string_view(start, it - start)));
}
if (it == end) {
break;
}
start = it++;
if (it == end) {
throw xml_parse_error("Invalid tag", start);
}
switch (*it) {
case '?':
skip_question_mark_tag(it, start, end);
break;
case '!':
skip_exclamation_mark_tag(it, start, end);
break;
case '/':
read_close_tag(builder, it, start, end);
break;
default:
read_tag(builder, it, start, end);
break;
}
}
return builder.release();
}
void read_tag(
xml_tree_builder& builder,
string_iterator& it,
string_iterator start,
string_iterator end)
{
assert(it == start + 1 && it != end);
quickbook::string_view name = read_tag_name(it, start, end);
xml_element* node = xml_element::node(name);
builder.add_element(node);
// Read attributes
while (true) {
read_some_of(it, end, " \t\n\r");
if (it == end) {
throw xml_parse_error("Invalid tag", start);
}
if (*it == '>') {
++it;
builder.start_children();
break;
}
if (*it == '/') {
++it;
read_some_of(it, end, " \t\n\r");
if (it == end || *it != '>') {
throw xml_parse_error("Invalid tag", start);
}
++it;
break;
}
quickbook::string_view attribute_name =
read_tag_name(it, start, end);
read_some_of(it, end, " \t\n\r");
if (it == end) {
throw xml_parse_error("Invalid tag", start);
}
quickbook::string_view attribute_value;
if (*it == '=') {
++it;
attribute_value = read_attribute_value(it, start, end);
}
node->set_attribute(
attribute_name,
quickbook::detail::decode_string(attribute_value));
}
}
void read_close_tag(
xml_tree_builder& builder,
string_iterator& it,
string_iterator start,
string_iterator end)
{
assert(it == start + 1 && it != end && *it == '/');
++it;
quickbook::string_view name = read_tag_name(it, start, end);
read_some_of(it, end, " \t\n\r");
if (it == end || *it != '>') {
throw xml_parse_error("Invalid close tag", start);
}
++it;
if (!builder.parent() || builder.parent()->name_ != name) {
throw xml_parse_error("Close tag doesn't match", start);
}
builder.end_children();
}
void skip_question_mark_tag(
string_iterator& it, string_iterator start, string_iterator end)
{
assert(it == start + 1 && it != end && *it == '?');
++it;
while (true) {
read_to_one_of(it, end, "\"'?<>");
if (it == end) {
throw xml_parse_error("Invalid tag", start);
}
switch (*it) {
case '"':
case '\'':
read_string(it, end);
break;
case '?':
if (read(it, end, "?>")) {
return;
}
else {
++it;
}
break;
default:
throw xml_parse_error("Invalid tag", start);
}
}
}
void skip_exclamation_mark_tag(
string_iterator& it, string_iterator start, string_iterator end)
{
assert(it == start + 1 && it != end && *it == '!');
++it;
if (read(it, end, "--")) {
if (read_past(it, end, "-->")) {
return;
}
else {
throw xml_parse_error("Invalid comment", start);
}
}
while (true) {
read_to_one_of(it, end, "\"'<>");
if (it == end) {
throw xml_parse_error("Invalid tag", start);
}
switch (*it) {
case '"':
case '\'':
read_string(it, end);
break;
case '>':
++it;
return;
default:
throw xml_parse_error("Invalid tag", start);
}
}
}
quickbook::string_view read_tag_name(
string_iterator& it, string_iterator start, string_iterator end)
{
read_some_of(it, end, " \t\n\r");
string_iterator name_start = it;
read_some_of(
it, end,
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ:-");
if (name_start == it) {
throw xml_parse_error("Invalid tag", start);
}
return quickbook::string_view(name_start, it - name_start);
}
quickbook::string_view read_attribute_value(
string_iterator& it, string_iterator start, string_iterator end)
{
read_some_of(it, end, " \t\n\r");
if (*it == '"' || *it == '\'') {
return read_string(it, end);
}
else {
throw xml_parse_error("Invalid tag", start);
}
}
quickbook::string_view read_string(
string_iterator& it, string_iterator end)
{
assert(it != end && (*it == '"' || *it == '\''));
string_iterator start = it;
char deliminator = *it;
++it;
read_to(it, end, deliminator);
if (it == end) {
throw xml_parse_error("Invalid string", start);
}
++it;
return quickbook::string_view(start + 1, it - start - 2);
}
}
}
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