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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef URL_URL_CANON_STDSTRING_H_
#define URL_URL_CANON_STDSTRING_H_
// This header file defines a canonicalizer output method class for STL
// strings. Because the canonicalizer tries not to be dependent on the STL,
// we have segregated it here.
#include <string>
#include "base/compiler_specific.h"
#include "url/url_canon.h"
namespace url_canon {
// Write into a std::string given in the constructor. This object does not own
// the string itself, and the user must ensure that the string stays alive
// throughout the lifetime of this object.
//
// The given string will be appended to; any existing data in the string will
// be preserved. The caller should reserve() the amount of data in the string
// they expect to be written. We will resize if necessary, but that's slow.
//
// Note that when canonicalization is complete, the string will likely have
// unused space at the end because we make the string very big to start out
// with (by |initial_size|). This ends up being important because resize
// operations are slow, and because the base class needs to write directly
// into the buffer.
//
// Therefore, the user should call Complete() before using the string that
// this class wrote into.
class StdStringCanonOutput : public CanonOutput {
public:
StdStringCanonOutput(std::string* str)
: CanonOutput(),
str_(str) {
cur_len_ = static_cast<int>(str_->size()); // Append to existing data.
str_->resize(str_->capacity());
buffer_ = str_->empty() ? NULL : &(*str_)[0];
buffer_len_ = static_cast<int>(str_->size());
}
virtual ~StdStringCanonOutput() {
// Nothing to do, we don't own the string.
}
// Must be called after writing has completed but before the string is used.
void Complete() {
str_->resize(cur_len_);
buffer_len_ = cur_len_;
}
virtual void Resize(int sz) OVERRIDE {
str_->resize(sz);
buffer_ = str_->empty() ? NULL : &(*str_)[0];
buffer_len_ = sz;
}
protected:
std::string* str_;
};
// An extension of the Replacements class that allows the setters to use
// standard strings.
//
// The strings passed as arguments are not copied and must remain valid until
// this class goes out of scope.
template<typename STR>
class StdStringReplacements :
public url_canon::Replacements<typename STR::value_type> {
public:
void SetSchemeStr(const STR& s) {
this->SetScheme(s.data(),
url_parse::Component(0, static_cast<int>(s.length())));
}
void SetUsernameStr(const STR& s) {
this->SetUsername(s.data(),
url_parse::Component(0, static_cast<int>(s.length())));
}
void SetPasswordStr(const STR& s) {
this->SetPassword(s.data(),
url_parse::Component(0, static_cast<int>(s.length())));
}
void SetHostStr(const STR& s) {
this->SetHost(s.data(),
url_parse::Component(0, static_cast<int>(s.length())));
}
void SetPortStr(const STR& s) {
this->SetPort(s.data(),
url_parse::Component(0, static_cast<int>(s.length())));
}
void SetPathStr(const STR& s) {
this->SetPath(s.data(),
url_parse::Component(0, static_cast<int>(s.length())));
}
void SetQueryStr(const STR& s) {
this->SetQuery(s.data(),
url_parse::Component(0, static_cast<int>(s.length())));
}
void SetRefStr(const STR& s) {
this->SetRef(s.data(),
url_parse::Component(0, static_cast<int>(s.length())));
}
};
} // namespace url_canon
#endif // URL_URL_CANON_STDSTRING_H_
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