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#include <AK/StringBuilder.h>
#include <AK/URL.h>
namespace AK {
static inline bool is_valid_protocol_character(char ch)
{
return ch >= 'a' && ch <= 'z';
}
static inline bool is_valid_hostname_character(char ch)
{
return ch && ch != '/' && ch != ':';
}
static inline bool is_digit(char ch)
{
return ch >= '0' && ch <= '9';
}
bool URL::parse(const StringView& string)
{
enum class State {
InProtocol,
InHostname,
InPort,
InPath,
};
Vector<char, 256> buffer;
State state { State::InProtocol };
int index = 0;
auto peek = [&] {
if (index >= string.length())
return '\0';
return string[index];
};
auto consume = [&] {
if (index >= string.length())
return '\0';
return string[index++];
};
while (index < string.length()) {
switch (state) {
case State::InProtocol:
if (is_valid_protocol_character(peek())) {
buffer.append(consume());
continue;
}
if (consume() != ':')
return false;
if (consume() != '/')
return false;
if (consume() != '/')
return false;
if (buffer.is_empty())
return false;
m_protocol = String::copy(buffer);
if (m_protocol == "http")
m_port = 80;
else if (m_protocol == "https")
m_port = 443;
buffer.clear();
if (m_protocol == "file")
state = State::InPath;
else
state = State::InHostname;
continue;
case State::InHostname:
if (is_valid_hostname_character(peek())) {
buffer.append(consume());
continue;
}
if (buffer.is_empty())
return false;
m_host = String::copy(buffer);
buffer.clear();
if (peek() == ':') {
consume();
state = State::InPort;
continue;
}
if (peek() == '/') {
state = State::InPath;
continue;
}
return false;
case State::InPort:
if (is_digit(peek())) {
buffer.append(consume());
continue;
}
if (buffer.is_empty())
return false;
{
bool ok;
m_port = String::copy(buffer).to_uint(ok);
buffer.clear();
if (!ok)
return false;
}
if (peek() == '/') {
state = State::InPath;
continue;
}
return false;
case State::InPath:
buffer.append(consume());
continue;
}
}
if (state == State::InHostname) {
// We're still in the hostname, so e.g "http://serenityos.org"
if (buffer.is_empty())
return false;
m_host = String::copy(buffer);
m_path = "/";
return true;
}
m_path = String::copy(buffer);
return true;
}
URL::URL(const StringView& string)
{
m_valid = parse(string);
}
String URL::to_string() const
{
StringBuilder builder;
builder.append(m_protocol);
builder.append("://");
if (protocol() != "file") {
builder.append(m_host);
if (!(protocol() == "http" && port() == 80) && !(protocol() == "https" && port() == 443)) {
builder.append(':');
builder.append(String::number(m_port));
}
}
builder.append(m_path);
return builder.to_string();
}
}
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