diff options
Diffstat (limited to 'app/gfx/text_elider.cc')
| -rw-r--r-- | app/gfx/text_elider.cc | 517 |
1 files changed, 517 insertions, 0 deletions
diff --git a/app/gfx/text_elider.cc b/app/gfx/text_elider.cc new file mode 100644 index 0000000..527f804 --- /dev/null +++ b/app/gfx/text_elider.cc @@ -0,0 +1,517 @@ +// Copyright (c) 2006-2008 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 "app/gfx/chrome_font.h" +#include "app/gfx/text_elider.h" +#include "base/file_path.h" +#include "base/string_util.h" +#include "base/sys_string_conversions.h" +#include "chrome/common/pref_names.h" +#include "chrome/common/pref_service.h" +#include "googleurl/src/gurl.h" +#include "net/base/escape.h" +#include "net/base/net_util.h" +#include "net/base/registry_controlled_domain.h" + +const wchar_t kEllipsis[] = L"\x2026"; + +namespace gfx { + +// Appends the given part of the original URL to the output string formatted for +// the user. The given parsed structure will be updated. The host name formatter +// also takes the same accept languages component as ElideURL. |new_parsed| may +// be null. +static void AppendFormattedHost(const GURL& url, + const std::wstring& languages, + std::wstring* output, + url_parse::Parsed* new_parsed); + +// Calls the unescaper for the substring |in_component| inside of the URL +// |spec|. The decoded string will be appended to |output| and the resulting +// range will be filled into |out_component|. +static void AppendFormattedComponent(const std::string& spec, + const url_parse::Component& in_component, + std::wstring* output, + url_parse::Component* out_component); + +// This function takes a GURL object and elides it. It returns a string +// which composed of parts from subdomain, domain, path, filename and query. +// A "..." is added automatically at the end if the elided string is bigger +// than the available pixel width. For available pixel width = 0, a formatted, +// but un-elided, string is returned. +// +// TODO(pkasting): http://b/119635 This whole function gets +// kerning/ligatures/etc. issues potentially wrong by assuming that the width of +// a rendered string is always the sum of the widths of its substrings. Also I +// suspect it could be made simpler. +std::wstring ElideUrl(const GURL& url, + const ChromeFont& font, + int available_pixel_width, + const std::wstring& languages) { + // Get a formatted string and corresponding parsing of the url. + url_parse::Parsed parsed; + std::wstring url_string = GetCleanStringFromUrl(url, languages, &parsed, + NULL); + if (available_pixel_width <= 0) + return url_string; + + // If non-standard or not file type, return plain eliding. + if (!(url.SchemeIsFile() || url.IsStandard())) + return ElideText(url_string, font, available_pixel_width); + + // Now start eliding url_string to fit within available pixel width. + // Fist pass - check to see whether entire url_string fits. + int pixel_width_url_string = font.GetStringWidth(url_string); + if (available_pixel_width >= pixel_width_url_string) + return url_string; + + // Get the path substring, including query and reference. + size_t path_start_index = parsed.path.begin; + size_t path_len = parsed.path.len; + std::wstring url_path_query_etc = url_string.substr(path_start_index); + std::wstring url_path = url_string.substr(path_start_index, path_len); + + // Return general elided text if url minus the query fits. + std::wstring url_minus_query = url_string.substr(0, path_start_index + + path_len); + if (available_pixel_width >= font.GetStringWidth(url_minus_query)) + return ElideText(url_string, font, available_pixel_width); + + // Get Host. + std::wstring url_host = UTF8ToWide(url.host()); + + // Get domain and registry information from the URL. + std::wstring url_domain = UTF8ToWide( + net::RegistryControlledDomainService::GetDomainAndRegistry(url)); + if (url_domain.empty()) + url_domain = url_host; + + // Add port if required. + if (!url.port().empty()){ + url_host += L":" + UTF8ToWide(url.port()); + url_domain += L":" + UTF8ToWide(url.port()); + } + + // Get sub domain. + std::wstring url_subdomain; + size_t domain_start_index = url_host.find(url_domain); + if (domain_start_index > 0) + url_subdomain = url_host.substr(0, domain_start_index); + if ((url_subdomain == L"www." || url_subdomain.empty() || + url.SchemeIsFile())) { + url_subdomain.clear(); + } + + // If this is a file type, the path is now defined as everything after ":". + // For example, "C:/aa/aa/bb", the path is "/aa/bb/cc". Interesting, the + // domain is now C: - this is a nice hack for eliding to work pleasantly. + if (url.SchemeIsFile()) { + // Split the path string using ":" + std::vector<std::wstring> file_path_split; + SplitString(url_path, L':', &file_path_split); + if (file_path_split.size() > 1) { // File is of type "file:///C:/.." + url_host.clear(); + url_domain.clear(); + url_subdomain.clear(); + + url_host = url_domain = file_path_split.at(0).substr(1) + L":"; + url_path_query_etc = url_path = file_path_split.at(1); + } + } + + // Second Pass - remove scheme - the rest fits. + int pixel_width_url_host = font.GetStringWidth(url_host); + int pixel_width_url_path = font.GetStringWidth(url_path_query_etc); + if (available_pixel_width >= + pixel_width_url_host + pixel_width_url_path) + return url_host + url_path_query_etc; + + // Third Pass: Subdomain, domain and entire path fits. + int pixel_width_url_domain = font.GetStringWidth(url_domain); + int pixel_width_url_subdomain = font.GetStringWidth(url_subdomain); + if (available_pixel_width >= + pixel_width_url_subdomain + pixel_width_url_domain + + pixel_width_url_path) + return url_subdomain + url_domain + url_path_query_etc; + + // Query element. + std::wstring url_query; + const int pixel_width_dots_trailer = font.GetStringWidth(kEllipsis); + if (parsed.query.is_nonempty()) { + url_query = std::wstring(L"?") + url_string.substr(parsed.query.begin); + if (available_pixel_width >= (pixel_width_url_subdomain + + pixel_width_url_domain + pixel_width_url_path - + font.GetStringWidth(url_query))) { + return ElideText(url_subdomain + url_domain + url_path_query_etc, font, + available_pixel_width); + } + } + + // Parse url_path using '/'. + std::vector<std::wstring> url_path_elements; + SplitString(url_path, L'/', &url_path_elements); + + // Get filename - note that for a path ending with / + // such as www.google.com/intl/ads/, the file name is ads/. + int url_path_number_of_elements = static_cast<int> (url_path_elements. + size()); + std::wstring url_filename; + if ((url_path_elements.at(url_path_number_of_elements - 1)).length() > 0) { + url_filename = *(url_path_elements.end()-1); + } else if (url_path_number_of_elements > 1) { // Path ends with a '/'. + url_filename = url_path_elements.at(url_path_number_of_elements - 2) + + L'/'; + url_path_number_of_elements--; + } + + const int kMaxNumberOfUrlPathElementsAllowed = 1024; + if (url_path_number_of_elements <= 1 || + url_path_number_of_elements > kMaxNumberOfUrlPathElementsAllowed) { + // No path to elide, or too long of a path (could overflow in loop below) + // Just elide this as a text string. + return ElideText(url_subdomain + url_domain + url_path_query_etc, font, + available_pixel_width); + } + + // Start eliding the path and replacing elements by "../". + std::wstring an_ellipsis_and_a_slash(kEllipsis); + an_ellipsis_and_a_slash += L'/'; + int pixel_width_url_filename = font.GetStringWidth(url_filename); + int pixel_width_dot_dot_slash = font.GetStringWidth(an_ellipsis_and_a_slash); + int pixel_width_slash = font.GetStringWidth(L"/"); + int pixel_width_url_path_elements[kMaxNumberOfUrlPathElementsAllowed]; + for (int i = 0; i < url_path_number_of_elements; ++i) { + pixel_width_url_path_elements[i] = + font.GetStringWidth(url_path_elements.at(i)); + } + + // Check with both subdomain and domain. + std::wstring elided_path; + int pixel_width_elided_path; + for (int i = url_path_number_of_elements - 1; i >= 1; --i) { + // Add the initial elements of the path. + elided_path.clear(); + pixel_width_elided_path = 0; + for (int j = 0; j < i; ++j) { + elided_path += url_path_elements.at(j) + L'/'; + pixel_width_elided_path += pixel_width_url_path_elements[j] + + pixel_width_slash; + } + + // Add url_file_name. + if (i == (url_path_number_of_elements - 1)) { + elided_path += url_filename; + pixel_width_elided_path += pixel_width_url_filename; + } else { + elided_path += an_ellipsis_and_a_slash + url_filename; + pixel_width_elided_path += pixel_width_dot_dot_slash + + pixel_width_url_filename; + } + + if (available_pixel_width >= + pixel_width_url_subdomain + pixel_width_url_domain + + pixel_width_elided_path) { + return ElideText(url_subdomain + url_domain + elided_path + url_query, + font, available_pixel_width); + } + } + + // Check with only domain. + // If a subdomain is present, add an ellipsis before domain. + // This is added only if the subdomain pixel width is larger than + // the pixel width of kEllipsis. Otherwise, subdomain remains, + // which means that this case has been resolved earlier. + std::wstring url_elided_domain = url_subdomain + url_domain; + int pixel_width_url_elided_domain = pixel_width_url_domain; + if (pixel_width_url_subdomain > pixel_width_dots_trailer) { + if (!url_subdomain.empty()) { + url_elided_domain = kEllipsis + url_domain; + pixel_width_url_elided_domain += pixel_width_dots_trailer; + } else { + url_elided_domain = url_domain; + } + + for (int i = url_path_number_of_elements - 1; i >= 1; --i) { + // Add the initial elements of the path. + elided_path.clear(); + pixel_width_elided_path = 0; + for (int j = 0; j < i; ++j) { + elided_path += url_path_elements.at(j) + L'/'; + pixel_width_elided_path += pixel_width_url_path_elements[j] + + pixel_width_slash; + } + + // Add url_file_name. + if (i == (url_path_number_of_elements - 1)) { + elided_path += url_filename; + pixel_width_elided_path += pixel_width_url_filename; + } else { + elided_path += an_ellipsis_and_a_slash + url_filename; + pixel_width_elided_path += pixel_width_dot_dot_slash + + pixel_width_url_filename; + } + + if (available_pixel_width >= + pixel_width_url_elided_domain + pixel_width_elided_path) { + return ElideText(url_elided_domain + elided_path + url_query, font, + available_pixel_width); + } + } + } + + // Return elided domain/../filename anyway. + std::wstring final_elided_url_string(url_elided_domain); + if ((available_pixel_width - font.GetStringWidth(url_elided_domain)) > + pixel_width_dot_dot_slash + pixel_width_dots_trailer + + font.GetStringWidth(L"UV")) // A hack to prevent trailing "../...". + final_elided_url_string += elided_path; + else + final_elided_url_string += url_path; + + return ElideText(final_elided_url_string, font, available_pixel_width); +} + +std::wstring ElideFilename(const FilePath& filename, + const ChromeFont& font, + int available_pixel_width) { + int full_width = font.GetStringWidth(filename.ToWStringHack()); + if (full_width <= available_pixel_width) + return filename.ToWStringHack(); + +#if defined(OS_WIN) + std::wstring extension = filename.Extension(); +#elif defined(OS_POSIX) + std::wstring extension = base::SysNativeMBToWide(filename.Extension()); +#endif + std::wstring rootname = + filename.BaseName().RemoveExtension().ToWStringHack(); + + if (rootname.empty() || extension.empty()) + return ElideText(filename.ToWStringHack(), font, available_pixel_width); + + int ext_width = font.GetStringWidth(extension); + int root_width = font.GetStringWidth(rootname); + + // We may have trimmed the path. + if (root_width + ext_width <= available_pixel_width) + return rootname + extension; + + int available_root_width = available_pixel_width - ext_width; + return ElideText(rootname, font, available_root_width) + extension; +} + +// This function adds an ellipsis at the end of the text if the text +// does not fit the given pixel width. +std::wstring ElideText(const std::wstring& text, + const ChromeFont& font, + int available_pixel_width){ + if (text.empty()) + return text; + + int current_text_pixel_width = font.GetStringWidth(text); + if (current_text_pixel_width <= available_pixel_width) + return text; + + if (font.GetStringWidth(kEllipsis) > available_pixel_width) + return std::wstring(); + + // Use binary search to compute the elided text. + size_t lo = 0; + size_t hi = text.length() - 1; + size_t guess = hi / 2; + while (lo < hi) { + // We check the length of the whole desired string at once to ensure we + // handle kerning/ligatures/etc. correctly. + std::wstring guess_str = text.substr(0, guess) + kEllipsis; + int guess_length = font.GetStringWidth(guess_str); + if (guess_length > available_pixel_width) { + if (hi == guess) + break; + hi = guess; + } else { + if (lo == guess) + break; + lo = guess; + } + guess = (lo + hi) / 2; + } + + return text.substr(0, lo) + kEllipsis; +} + +void AppendFormattedHost(const GURL& url, + const std::wstring& languages, + std::wstring* output, + url_parse::Parsed* new_parsed) { + const url_parse::Component& host = + url.parsed_for_possibly_invalid_spec().host; + + if (host.is_nonempty()) { + // Handle possible IDN in the host name. + if (new_parsed) + new_parsed->host.begin = static_cast<int>(output->length()); + + const std::string& spec = url.possibly_invalid_spec(); + DCHECK(host.begin >= 0 && + ((spec.length() == 0 && host.begin == 0) || + host.begin < static_cast<int>(spec.length()))); + net::IDNToUnicode(&spec[host.begin], host.len, languages, output); + + if (new_parsed) { + new_parsed->host.len = + static_cast<int>(output->length()) - new_parsed->host.begin; + } + } else if (new_parsed) { + new_parsed->host.reset(); + } +} + +void AppendFormattedComponent(const std::string& spec, + const url_parse::Component& in_component, + std::wstring* output, + url_parse::Component* out_component) { + if (in_component.is_nonempty()) { + out_component->begin = static_cast<int>(output->length()); + + output->append(UnescapeAndDecodeUTF8URLComponent( + spec.substr(in_component.begin, in_component.len), + UnescapeRule::NORMAL)); + + out_component->len = + static_cast<int>(output->length()) - out_component->begin; + } else { + out_component->reset(); + } +} + +std::wstring GetCleanStringFromUrl(const GURL& url, + const std::wstring& languages, + url_parse::Parsed* new_parsed, + size_t* prefix_end) { + url_parse::Parsed parsed_temp; + if (!new_parsed) + new_parsed = &parsed_temp; + + std::wstring url_string; + + // Check for empty URLs or 0 available text width. + if (url.is_empty()) { + if (prefix_end) + *prefix_end = 0; + return url_string; + } + + // We handle both valid and invalid URLs (this will give us the spec + // regardless of validity). + const std::string& spec = url.possibly_invalid_spec(); + const url_parse::Parsed& parsed = url.parsed_for_possibly_invalid_spec(); + + // Construct a new URL with the username and password fields removed. We + // don't want to display those to the user since they can be used for + // attacks, e.g. "http://google.com:search@evil.ru/" + // + // Copy everything before the host name we want (the scheme and the + // separators), minus the username start we computed above. These are ASCII. + int pre_end = parsed.CountCharactersBefore( + url_parse::Parsed::USERNAME, true); + for (int i = 0; i < pre_end; ++i) + url_string.push_back(spec[i]); + if (prefix_end) + *prefix_end = static_cast<size_t>(pre_end); + new_parsed->scheme = parsed.scheme; + new_parsed->username.reset(); + new_parsed->password.reset(); + + AppendFormattedHost(url, languages, &url_string, new_parsed); + + // Port. + if (parsed.port.is_nonempty()) { + url_string.push_back(':'); + for (int i = parsed.port.begin; i < parsed.port.end(); ++i) + url_string.push_back(spec[i]); + } + + // Path and query both get the same general unescape & convert treatment. + AppendFormattedComponent(spec, parsed.path, &url_string, &new_parsed->path); + if (parsed.query.is_valid()) + url_string.push_back('?'); + AppendFormattedComponent(spec, parsed.query, &url_string, &new_parsed->query); + + // Reference is stored in valid, unescaped UTF-8, so we can just convert. + if (parsed.ref.is_valid()) { + url_string.push_back('#'); + if (parsed.ref.len > 0) + url_string.append(UTF8ToWide(std::string(&spec[parsed.ref.begin], + parsed.ref.len))); + } + + return url_string; +} + +SortedDisplayURL::SortedDisplayURL(const GURL& url, + const std::wstring& languages) { + std::wstring host; + AppendFormattedHost(url, languages, &host, NULL); + sort_host_ = WideToUTF16Hack(host); + string16 host_minus_www = WideToUTF16Hack(net::StripWWW(host)); + url_parse::Parsed parsed; + display_url_ = WideToUTF16Hack(GetCleanStringFromUrl(url, languages, + &parsed, &prefix_end_)); + if (sort_host_.length() > host_minus_www.length()) { + prefix_end_ += sort_host_.length() - host_minus_www.length(); + sort_host_.swap(host_minus_www); + } +} + +int SortedDisplayURL::Compare(const SortedDisplayURL& other, + Collator* collator) const { + // Compare on hosts first. The host won't contain 'www.'. + UErrorCode compare_status = U_ZERO_ERROR; + UCollationResult host_compare_result = collator->compare( + static_cast<const UChar*>(sort_host_.c_str()), + static_cast<int>(sort_host_.length()), + static_cast<const UChar*>(other.sort_host_.c_str()), + static_cast<int>(other.sort_host_.length()), + compare_status); + DCHECK(U_SUCCESS(compare_status)); + if (host_compare_result != 0) + return host_compare_result; + + // Hosts match, compare on the portion of the url after the host. + string16 path = this->AfterHost(); + string16 o_path = other.AfterHost(); + compare_status = U_ZERO_ERROR; + UCollationResult path_compare_result = collator->compare( + static_cast<const UChar*>(path.c_str()), + static_cast<int>(path.length()), + static_cast<const UChar*>(o_path.c_str()), + static_cast<int>(o_path.length()), + compare_status); + DCHECK(U_SUCCESS(compare_status)); + if (path_compare_result != 0) + return path_compare_result; + + // Hosts and paths match, compare on the complete url. This'll push the www. + // ones to the end. + compare_status = U_ZERO_ERROR; + UCollationResult display_url_compare_result = collator->compare( + static_cast<const UChar*>(display_url_.c_str()), + static_cast<int>(display_url_.length()), + static_cast<const UChar*>(other.display_url_.c_str()), + static_cast<int>(other.display_url_.length()), + compare_status); + DCHECK(U_SUCCESS(compare_status)); + return display_url_compare_result; +} + +string16 SortedDisplayURL::AfterHost() const { + size_t slash_index = display_url_.find(sort_host_, prefix_end_); + if (slash_index == string16::npos) { + NOTREACHED(); + return string16(); + } + return display_url_.substr(slash_index + sort_host_.length()); +} + +} // namespace gfx. |