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//===--- Marshallers.cpp ----------------------------------------*- 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 "Marshallers.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Regex.h"
#include <optional>
#include <string>
static std::optional<std::string>
getBestGuess(llvm::StringRef Search, llvm::ArrayRef<llvm::StringRef> Allowed,
llvm::StringRef DropPrefix = "", unsigned MaxEditDistance = 3) {
if (MaxEditDistance != ~0U)
++MaxEditDistance;
llvm::StringRef Res;
for (const llvm::StringRef &Item : Allowed) {
if (Item.equals_insensitive(Search)) {
assert(!Item.equals(Search) && "This should be handled earlier on.");
MaxEditDistance = 1;
Res = Item;
continue;
}
unsigned Distance = Item.edit_distance(Search);
if (Distance < MaxEditDistance) {
MaxEditDistance = Distance;
Res = Item;
}
}
if (!Res.empty())
return Res.str();
if (!DropPrefix.empty()) {
--MaxEditDistance; // Treat dropping the prefix as 1 edit
for (const llvm::StringRef &Item : Allowed) {
auto NoPrefix = Item;
if (!NoPrefix.consume_front(DropPrefix))
continue;
if (NoPrefix.equals_insensitive(Search)) {
if (NoPrefix.equals(Search))
return Item.str();
MaxEditDistance = 1;
Res = Item;
continue;
}
unsigned Distance = NoPrefix.edit_distance(Search);
if (Distance < MaxEditDistance) {
MaxEditDistance = Distance;
Res = Item;
}
}
if (!Res.empty())
return Res.str();
}
return std::nullopt;
}
std::optional<std::string>
clang::ast_matchers::dynamic::internal::ArgTypeTraits<
clang::attr::Kind>::getBestGuess(const VariantValue &Value) {
static constexpr llvm::StringRef Allowed[] = {
#define ATTR(X) "attr::" #X,
#include "clang/Basic/AttrList.inc"
};
if (Value.isString())
return ::getBestGuess(Value.getString(), llvm::ArrayRef(Allowed), "attr::");
return std::nullopt;
}
std::optional<std::string>
clang::ast_matchers::dynamic::internal::ArgTypeTraits<
clang::CastKind>::getBestGuess(const VariantValue &Value) {
static constexpr llvm::StringRef Allowed[] = {
#define CAST_OPERATION(Name) "CK_" #Name,
#include "clang/AST/OperationKinds.def"
};
if (Value.isString())
return ::getBestGuess(Value.getString(), llvm::ArrayRef(Allowed), "CK_");
return std::nullopt;
}
std::optional<std::string>
clang::ast_matchers::dynamic::internal::ArgTypeTraits<
clang::OpenMPClauseKind>::getBestGuess(const VariantValue &Value) {
static constexpr llvm::StringRef Allowed[] = {
#define GEN_CLANG_CLAUSE_CLASS
#define CLAUSE_CLASS(Enum, Str, Class) #Enum,
#include "llvm/Frontend/OpenMP/OMP.inc"
};
if (Value.isString())
return ::getBestGuess(Value.getString(), llvm::ArrayRef(Allowed), "OMPC_");
return std::nullopt;
}
std::optional<std::string>
clang::ast_matchers::dynamic::internal::ArgTypeTraits<
clang::UnaryExprOrTypeTrait>::getBestGuess(const VariantValue &Value) {
static constexpr llvm::StringRef Allowed[] = {
#define UNARY_EXPR_OR_TYPE_TRAIT(Spelling, Name, Key) "UETT_" #Name,
#define CXX11_UNARY_EXPR_OR_TYPE_TRAIT(Spelling, Name, Key) "UETT_" #Name,
#include "clang/Basic/TokenKinds.def"
};
if (Value.isString())
return ::getBestGuess(Value.getString(), llvm::ArrayRef(Allowed), "UETT_");
return std::nullopt;
}
static constexpr std::pair<llvm::StringRef, llvm::Regex::RegexFlags>
RegexMap[] = {
{"NoFlags", llvm::Regex::RegexFlags::NoFlags},
{"IgnoreCase", llvm::Regex::RegexFlags::IgnoreCase},
{"Newline", llvm::Regex::RegexFlags::Newline},
{"BasicRegex", llvm::Regex::RegexFlags::BasicRegex},
};
static std::optional<llvm::Regex::RegexFlags>
getRegexFlag(llvm::StringRef Flag) {
for (const auto &StringFlag : RegexMap) {
if (Flag == StringFlag.first)
return StringFlag.second;
}
return std::nullopt;
}
static std::optional<llvm::StringRef> getCloseRegexMatch(llvm::StringRef Flag) {
for (const auto &StringFlag : RegexMap) {
if (Flag.edit_distance(StringFlag.first) < 3)
return StringFlag.first;
}
return std::nullopt;
}
std::optional<llvm::Regex::RegexFlags>
clang::ast_matchers::dynamic::internal::ArgTypeTraits<
llvm::Regex::RegexFlags>::getFlags(llvm::StringRef Flags) {
std::optional<llvm::Regex::RegexFlags> Flag;
SmallVector<StringRef, 4> Split;
Flags.split(Split, '|', -1, false);
for (StringRef OrFlag : Split) {
if (std::optional<llvm::Regex::RegexFlags> NextFlag =
getRegexFlag(OrFlag.trim()))
Flag = Flag.value_or(llvm::Regex::NoFlags) | *NextFlag;
else
return std::nullopt;
}
return Flag;
}
std::optional<std::string>
clang::ast_matchers::dynamic::internal::ArgTypeTraits<
llvm::Regex::RegexFlags>::getBestGuess(const VariantValue &Value) {
if (!Value.isString())
return std::nullopt;
SmallVector<StringRef, 4> Split;
llvm::StringRef(Value.getString()).split(Split, '|', -1, false);
for (llvm::StringRef &Flag : Split) {
if (std::optional<llvm::StringRef> BestGuess =
getCloseRegexMatch(Flag.trim()))
Flag = *BestGuess;
else
return std::nullopt;
}
if (Split.empty())
return std::nullopt;
return llvm::join(Split, " | ");
}
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