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include_complete.cc
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include_complete.cc
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#include "include_complete.h"
#include "match.h"
#include "platform.h"
#include "project.h"
#include "standard_includes.h"
#include "timer.h"
#include "work_thread.h"
#include <thread>
namespace {
struct CompletionCandidate {
std::string absolute_path;
lsCompletionItem completion_item;
};
std::string ElideLongPath(Config* config, const std::string& path) {
if (config->completion.includeMaxPathSize <= 0)
return path;
if ((int)path.size() <= config->completion.includeMaxPathSize)
return path;
size_t start = path.size() - config->completion.includeMaxPathSize;
return ".." + path.substr(start + 2);
}
size_t TrimCommonPathPrefix(const std::string& result,
const std::string& trimmer) {
size_t i = 0;
while (i < result.size() && i < trimmer.size()) {
char a = result[i];
char b = trimmer[i];
#if defined(_WIN32)
a = (char)tolower(a);
b = (char)tolower(b);
#endif
if (a != b)
break;
++i;
}
if (i == trimmer.size())
return i;
return 0;
}
// Returns true iff angle brackets should be used.
bool TrimPath(Project* project,
const std::string& project_root,
std::string* insert_path) {
size_t start = 0;
bool angle = false;
size_t len = TrimCommonPathPrefix(*insert_path, project_root);
if (len > start)
start = len;
for (auto& include_dir : project->quote_include_directories) {
len = TrimCommonPathPrefix(*insert_path, include_dir);
if (len > start)
start = len;
}
for (auto& include_dir : project->angle_include_directories) {
len = TrimCommonPathPrefix(*insert_path, include_dir);
if (len > start) {
start = len;
angle = true;
}
}
*insert_path = insert_path->substr(start);
return angle;
}
lsCompletionItem BuildCompletionItem(Config* config,
const std::string& path,
bool use_angle_brackets,
bool is_stl) {
lsCompletionItem item;
item.label = ElideLongPath(config, path);
item.detail = path; // the include path, used in de-duplicating
item.textEdit = lsTextEdit();
item.textEdit->newText = path;
item.insertTextFormat = lsInsertTextFormat::PlainText;
item.use_angle_brackets_ = use_angle_brackets;
if (is_stl) {
item.kind = lsCompletionItemKind::Module;
item.priority_ = 2;
} else {
item.kind = lsCompletionItemKind::File;
item.priority_ = 1;
}
return item;
}
} // namespace
IncludeComplete::IncludeComplete(Config* config, Project* project)
: is_scanning(false), config_(config), project_(project) {}
void IncludeComplete::Rescan() {
if (is_scanning)
return;
completion_items.clear();
absolute_path_to_completion_item.clear();
inserted_paths.clear();
if (!match_ && (!config_->completion.includeWhitelist.empty() ||
!config_->completion.includeBlacklist.empty()))
match_ = MakeUnique<GroupMatch>(config_->completion.includeWhitelist,
config_->completion.includeBlacklist);
is_scanning = true;
WorkThread::StartThread("scan_includes", [this]() {
Timer timer;
InsertStlIncludes();
InsertIncludesFromDirectory(config_->projectRoot,
false /*use_angle_brackets*/);
for (const std::string& dir : project_->quote_include_directories)
InsertIncludesFromDirectory(dir, false /*use_angle_brackets*/);
for (const std::string& dir : project_->angle_include_directories)
InsertIncludesFromDirectory(dir, true /*use_angle_brackets*/);
timer.ResetAndPrint("[perf] Scanning for includes");
is_scanning = false;
});
}
void IncludeComplete::InsertCompletionItem(const std::string& absolute_path,
lsCompletionItem&& item) {
if (inserted_paths.insert({item.detail, inserted_paths.size()}).second) {
completion_items.push_back(item);
// insert if not found or with shorter include path
auto it = absolute_path_to_completion_item.find(absolute_path);
if (it == absolute_path_to_completion_item.end() ||
completion_items[it->second].detail.length() > item.detail.length())
absolute_path_to_completion_item[absolute_path] = completion_items.size();
} else {
lsCompletionItem& inserted_item =
completion_items[inserted_paths[item.detail]];
// Update |use_angle_brackets_|, prefer quotes.
if (!item.use_angle_brackets_)
inserted_item.use_angle_brackets_ = false;
}
}
void IncludeComplete::AddFile(const std::string& absolute_path) {
if (!EndsWithAny(absolute_path, config_->completion.includeSuffixWhitelist))
return;
if (match_ && !match_->IsMatch(absolute_path))
return;
std::string trimmed_path = absolute_path;
bool use_angle_brackets =
TrimPath(project_, config_->projectRoot, &trimmed_path);
lsCompletionItem item = BuildCompletionItem(
config_, trimmed_path, use_angle_brackets, false /*is_stl*/);
std::unique_lock<std::mutex> lock(completion_items_mutex, std::defer_lock);
if (is_scanning)
lock.lock();
InsertCompletionItem(absolute_path, std::move(item));
if (lock)
lock.unlock();
}
void IncludeComplete::InsertIncludesFromDirectory(std::string directory,
bool use_angle_brackets) {
directory = NormalizePath(directory);
EnsureEndsInSlash(directory);
if (match_ && !match_->IsMatch(directory)) {
// Don't even enter the directory if it fails the patterns.
return;
}
std::vector<CompletionCandidate> results;
GetFilesInFolder(
directory, true /*recursive*/, false /*add_folder_to_path*/,
[&](const std::string& path) {
if (!EndsWithAny(path, config_->completion.includeSuffixWhitelist))
return;
if (match_ && !match_->IsMatch(directory + path))
return;
CompletionCandidate candidate;
candidate.absolute_path = directory + path;
candidate.completion_item = BuildCompletionItem(
config_, path, use_angle_brackets, false /*is_stl*/);
results.push_back(candidate);
});
std::lock_guard<std::mutex> lock(completion_items_mutex);
for (CompletionCandidate& result : results)
InsertCompletionItem(result.absolute_path,
std::move(result.completion_item));
}
void IncludeComplete::InsertStlIncludes() {
std::lock_guard<std::mutex> lock(completion_items_mutex);
for (const char* stl_header : kStandardLibraryIncludes) {
completion_items.push_back(BuildCompletionItem(
config_, stl_header, true /*use_angle_brackets*/, true /*is_stl*/));
}
}
optional<lsCompletionItem> IncludeComplete::FindCompletionItemForAbsolutePath(
const std::string& absolute_path) {
std::lock_guard<std::mutex> lock(completion_items_mutex);
auto it = absolute_path_to_completion_item.find(absolute_path);
if (it == absolute_path_to_completion_item.end())
return nullopt;
return completion_items[it->second];
}