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// Copyright (c) 2010 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.
#include "chrome/browser/autocomplete/history_url_provider.h"
#include <string>
#include "base/string_util.h"
#include "base/utf_string_conversions.h"
#include "chrome/browser/net/url_fixer_upper.h"
#include "chrome/common/url_constants.h"
#include "googleurl/src/url_util.h"
HistoryProvider::HistoryProvider(ACProviderListener* listener,
Profile* profile,
const char* name)
: AutocompleteProvider(listener, profile, name) {
}
// static
std::wstring HistoryProvider::FixupUserInput(const AutocompleteInput& input) {
const std::wstring& input_text = input.text();
// Fixup and canonicalize user input.
const GURL canonical_gurl(URLFixerUpper::FixupURL(WideToUTF8(input_text),
std::string()));
std::string canonical_gurl_str(canonical_gurl.possibly_invalid_spec());
if (canonical_gurl_str.empty()) {
// This probably won't happen, but there are no guarantees.
return input_text;
}
// If the user types a number, GURL will convert it to a dotted quad.
// However, if the parser did not mark this as a URL, then the user probably
// didn't intend this interpretation. Since this can break history matching
// for hostname beginning with numbers (e.g. input of "17173" will be matched
// against "0.0.67.21" instead of the original "17173", failing to find
// "17173.com"), swap the original hostname in for the fixed-up one.
if ((input.type() != AutocompleteInput::URL) &&
canonical_gurl.HostIsIPAddress()) {
std::string original_hostname =
WideToUTF8(input_text.substr(input.parts().host.begin,
input.parts().host.len));
const url_parse::Parsed& parts =
canonical_gurl.parsed_for_possibly_invalid_spec();
// parts.host must not be empty when HostIsIPAddress() is true.
DCHECK(parts.host.is_nonempty());
canonical_gurl_str.replace(parts.host.begin, parts.host.len,
original_hostname);
}
std::wstring output = UTF8ToWide(canonical_gurl_str);
// Don't prepend a scheme when the user didn't have one. Since the fixer
// upper only prepends the "http" scheme, that's all we need to check for.
if (canonical_gurl.SchemeIs(chrome::kHttpScheme) &&
!url_util::FindAndCompareScheme(WideToUTF8(input_text),
chrome::kHttpScheme, NULL))
TrimHttpPrefix(&output);
// Make the number of trailing slashes on the output exactly match the input.
// Examples of why not doing this would matter:
// * The user types "a" and has this fixed up to "a/". Now no other sites
// beginning with "a" will match.
// * The user types "file:" and has this fixed up to "file://". Now inline
// autocomplete will append too few slashes, resulting in e.g. "file:/b..."
// instead of "file:///b..."
// * The user types "http:/" and has this fixed up to "http:". Now inline
// autocomplete will append too many slashes, resulting in e.g.
// "http:///c..." instead of "http://c...".
// NOTE: We do this after calling TrimHttpPrefix() since that can strip
// trailing slashes (if the scheme is the only thing in the input). It's not
// clear that the result of fixup really matters in this case, but there's no
// harm in making sure.
const size_t last_input_nonslash = input_text.find_last_not_of(L"/\\");
const size_t num_input_slashes = (last_input_nonslash == std::wstring::npos) ?
input_text.length() : (input_text.length() - 1 - last_input_nonslash);
const size_t last_output_nonslash = output.find_last_not_of(L"/\\");
const size_t num_output_slashes =
(last_output_nonslash == std::wstring::npos) ?
output.length() : (output.length() - 1 - last_output_nonslash);
if (num_output_slashes < num_input_slashes)
output.append(num_input_slashes - num_output_slashes, '/');
else if (num_output_slashes > num_input_slashes)
output.erase(output.length() - num_output_slashes + num_input_slashes);
return output;
}
// static
size_t HistoryProvider::TrimHttpPrefix(std::wstring* url) {
// Find any "http:".
if (!HasHTTPScheme(*url))
return 0;
size_t scheme_pos = url->find(ASCIIToWide(chrome::kHttpScheme) + L":");
DCHECK(scheme_pos != std::wstring::npos);
// Erase scheme plus up to two slashes.
size_t prefix_end = scheme_pos + strlen(chrome::kHttpScheme) + 1;
const size_t after_slashes = std::min(url->length(), prefix_end + 2);
while ((prefix_end < after_slashes) && ((*url)[prefix_end] == L'/'))
++prefix_end;
url->erase(scheme_pos, prefix_end - scheme_pos);
return (scheme_pos == 0) ? prefix_end : 0;
}
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