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//===--- CommentCommandTraits.cpp - Comment command properties --*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "clang/AST/CommentCommandTraits.h"
#include "llvm/ADT/STLExtras.h"
#include <cassert>
namespace clang {
namespace comments {
#include "clang/AST/CommentCommandInfo.inc"
CommandTraits::CommandTraits(llvm::BumpPtrAllocator &Allocator,
const CommentOptions &CommentOptions) :
NextID(llvm::array_lengthof(Commands)), Allocator(Allocator) {
registerCommentOptions(CommentOptions);
}
void CommandTraits::registerCommentOptions(
const CommentOptions &CommentOptions) {
for (CommentOptions::BlockCommandNamesTy::const_iterator
I = CommentOptions.BlockCommandNames.begin(),
E = CommentOptions.BlockCommandNames.end();
I != E; I++) {
registerBlockCommand(*I);
}
}
const CommandInfo *CommandTraits::getCommandInfoOrNULL(StringRef Name) const {
if (const CommandInfo *Info = getBuiltinCommandInfo(Name))
return Info;
return getRegisteredCommandInfo(Name);
}
const CommandInfo *CommandTraits::getCommandInfo(unsigned CommandID) const {
if (const CommandInfo *Info = getBuiltinCommandInfo(CommandID))
return Info;
return getRegisteredCommandInfo(CommandID);
}
const CommandInfo *
CommandTraits::getTypoCorrectCommandInfo(StringRef Typo) const {
// Single-character command impostures, such as \t or \n, should not go
// through the fixit logic.
if (Typo.size() <= 1)
return nullptr;
// The maximum edit distance we're prepared to accept.
const unsigned MaxEditDistance = 1;
unsigned BestEditDistance = MaxEditDistance;
SmallVector<const CommandInfo *, 2> BestCommand;
auto ConsiderCorrection = [&](const CommandInfo *Command) {
StringRef Name = Command->Name;
unsigned MinPossibleEditDistance = abs((int)Name.size() - (int)Typo.size());
if (MinPossibleEditDistance <= BestEditDistance) {
unsigned EditDistance = Typo.edit_distance(Name, true, BestEditDistance);
if (EditDistance < BestEditDistance) {
BestEditDistance = EditDistance;
BestCommand.clear();
}
if (EditDistance == BestEditDistance)
BestCommand.push_back(Command);
}
};
for (const auto &Command : Commands)
ConsiderCorrection(&Command);
for (const auto *Command : RegisteredCommands)
if (!Command->IsUnknownCommand)
ConsiderCorrection(Command);
return BestCommand.size() == 1 ? BestCommand[0] : nullptr;
}
CommandInfo *CommandTraits::createCommandInfoWithName(StringRef CommandName) {
char *Name = Allocator.Allocate<char>(CommandName.size() + 1);
memcpy(Name, CommandName.data(), CommandName.size());
Name[CommandName.size()] = '\0';
// Value-initialize (=zero-initialize in this case) a new CommandInfo.
CommandInfo *Info = new (Allocator) CommandInfo();
Info->Name = Name;
// We only have a limited number of bits to encode command IDs in the
// CommandInfo structure, so the ID numbers can potentially wrap around.
assert((NextID < (1 << CommandInfo::NumCommandIDBits))
&& "Too many commands. We have limited bits for the command ID.");
Info->ID = NextID++;
RegisteredCommands.push_back(Info);
return Info;
}
const CommandInfo *CommandTraits::registerUnknownCommand(
StringRef CommandName) {
CommandInfo *Info = createCommandInfoWithName(CommandName);
Info->IsUnknownCommand = true;
return Info;
}
const CommandInfo *CommandTraits::registerBlockCommand(StringRef CommandName) {
CommandInfo *Info = createCommandInfoWithName(CommandName);
Info->IsBlockCommand = true;
return Info;
}
const CommandInfo *CommandTraits::getBuiltinCommandInfo(
unsigned CommandID) {
if (CommandID < llvm::array_lengthof(Commands))
return &Commands[CommandID];
return nullptr;
}
const CommandInfo *CommandTraits::getRegisteredCommandInfo(
StringRef Name) const {
for (unsigned i = 0, e = RegisteredCommands.size(); i != e; ++i) {
if (RegisteredCommands[i]->Name == Name)
return RegisteredCommands[i];
}
return nullptr;
}
const CommandInfo *CommandTraits::getRegisteredCommandInfo(
unsigned CommandID) const {
return RegisteredCommands[CommandID - llvm::array_lengthof(Commands)];
}
} // end namespace comments
} // end namespace clang
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