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//===--- IdentifierLengthCheck.cpp - clang-tidy
//-----------------------------===//
//
// 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 "IdentifierLengthCheck.h"
#include "../utils/OptionsUtils.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
using namespace clang::ast_matchers;
namespace clang::tidy::readability {
const unsigned DefaultMinimumVariableNameLength = 3;
const unsigned DefaultMinimumLoopCounterNameLength = 2;
const unsigned DefaultMinimumExceptionNameLength = 2;
const unsigned DefaultMinimumParameterNameLength = 3;
const char DefaultIgnoredLoopCounterNames[] = "^[ijk_]$";
const char DefaultIgnoredVariableNames[] = "";
const char DefaultIgnoredExceptionVariableNames[] = "^[e]$";
const char DefaultIgnoredParameterNames[] = "^[n]$";
const char ErrorMessage[] =
"%select{variable|exception variable|loop variable|"
"parameter}0 name %1 is too short, expected at least %2 characters";
IdentifierLengthCheck::IdentifierLengthCheck(StringRef Name,
ClangTidyContext *Context)
: ClangTidyCheck(Name, Context),
MinimumVariableNameLength(Options.get("MinimumVariableNameLength",
DefaultMinimumVariableNameLength)),
MinimumLoopCounterNameLength(Options.get(
"MinimumLoopCounterNameLength", DefaultMinimumLoopCounterNameLength)),
MinimumExceptionNameLength(Options.get(
"MinimumExceptionNameLength", DefaultMinimumExceptionNameLength)),
MinimumParameterNameLength(Options.get(
"MinimumParameterNameLength", DefaultMinimumParameterNameLength)),
IgnoredVariableNamesInput(
Options.get("IgnoredVariableNames", DefaultIgnoredVariableNames)),
IgnoredVariableNames(IgnoredVariableNamesInput),
IgnoredLoopCounterNamesInput(Options.get("IgnoredLoopCounterNames",
DefaultIgnoredLoopCounterNames)),
IgnoredLoopCounterNames(IgnoredLoopCounterNamesInput),
IgnoredExceptionVariableNamesInput(
Options.get("IgnoredExceptionVariableNames",
DefaultIgnoredExceptionVariableNames)),
IgnoredExceptionVariableNames(IgnoredExceptionVariableNamesInput),
IgnoredParameterNamesInput(
Options.get("IgnoredParameterNames", DefaultIgnoredParameterNames)),
IgnoredParameterNames(IgnoredParameterNamesInput) {}
void IdentifierLengthCheck::storeOptions(ClangTidyOptions::OptionMap &Opts) {
Options.store(Opts, "MinimumVariableNameLength", MinimumVariableNameLength);
Options.store(Opts, "MinimumLoopCounterNameLength",
MinimumLoopCounterNameLength);
Options.store(Opts, "MinimumExceptionNameLength", MinimumExceptionNameLength);
Options.store(Opts, "MinimumParameterNameLength", MinimumParameterNameLength);
Options.store(Opts, "IgnoredLoopCounterNames", IgnoredLoopCounterNamesInput);
Options.store(Opts, "IgnoredVariableNames", IgnoredVariableNamesInput);
Options.store(Opts, "IgnoredExceptionVariableNames",
IgnoredExceptionVariableNamesInput);
Options.store(Opts, "IgnoredParameterNames", IgnoredParameterNamesInput);
}
void IdentifierLengthCheck::registerMatchers(MatchFinder *Finder) {
if (MinimumLoopCounterNameLength > 1)
Finder->addMatcher(
forStmt(hasLoopInit(declStmt(forEach(varDecl().bind("loopVar"))))),
this);
if (MinimumExceptionNameLength > 1)
Finder->addMatcher(varDecl(hasParent(cxxCatchStmt())).bind("exceptionVar"),
this);
if (MinimumParameterNameLength > 1)
Finder->addMatcher(parmVarDecl().bind("paramVar"), this);
if (MinimumVariableNameLength > 1)
Finder->addMatcher(
varDecl(unless(anyOf(hasParent(declStmt(hasParent(forStmt()))),
hasParent(cxxCatchStmt()), parmVarDecl())))
.bind("standaloneVar"),
this);
}
void IdentifierLengthCheck::check(const MatchFinder::MatchResult &Result) {
const auto *StandaloneVar = Result.Nodes.getNodeAs<VarDecl>("standaloneVar");
if (StandaloneVar) {
if (!StandaloneVar->getIdentifier())
return;
StringRef VarName = StandaloneVar->getName();
if (VarName.size() >= MinimumVariableNameLength ||
IgnoredVariableNames.match(VarName))
return;
diag(StandaloneVar->getLocation(), ErrorMessage)
<< 0 << StandaloneVar << MinimumVariableNameLength;
}
auto *ExceptionVarName = Result.Nodes.getNodeAs<VarDecl>("exceptionVar");
if (ExceptionVarName) {
if (!ExceptionVarName->getIdentifier())
return;
StringRef VarName = ExceptionVarName->getName();
if (VarName.size() >= MinimumExceptionNameLength ||
IgnoredExceptionVariableNames.match(VarName))
return;
diag(ExceptionVarName->getLocation(), ErrorMessage)
<< 1 << ExceptionVarName << MinimumExceptionNameLength;
}
const auto *LoopVar = Result.Nodes.getNodeAs<VarDecl>("loopVar");
if (LoopVar) {
if (!LoopVar->getIdentifier())
return;
StringRef VarName = LoopVar->getName();
if (VarName.size() >= MinimumLoopCounterNameLength ||
IgnoredLoopCounterNames.match(VarName))
return;
diag(LoopVar->getLocation(), ErrorMessage)
<< 2 << LoopVar << MinimumLoopCounterNameLength;
}
const auto *ParamVar = Result.Nodes.getNodeAs<VarDecl>("paramVar");
if (ParamVar) {
if (!ParamVar->getIdentifier())
return;
StringRef VarName = ParamVar->getName();
if (VarName.size() >= MinimumParameterNameLength ||
IgnoredParameterNames.match(VarName))
return;
diag(ParamVar->getLocation(), ErrorMessage)
<< 3 << ParamVar << MinimumParameterNameLength;
}
}
} // namespace clang::tidy::readability
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